Adding upstream version 2.12.1.upstream/2.12.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

120 files changed, 21728 insertions, 0 deletions

diff --git a/library/Icinga/Web/Announcement.php b/library/Icinga/Web/Announcement.php
new file mode 100644
index 0000000..9835ce0
--- /dev/null
+++ b/library/Icinga/Web/Announcement.php
@@ -0,0 +1,158 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+/**
+ * An announcement to be displayed prominently in the web UI
+ */
+class Announcement
+{
+    /**
+     * @var string
+     */
+    protected $author;
+
+    /**
+     * @var string
+     */
+    protected $message;
+
+    /**
+     * @var int
+     */
+    protected $start;
+
+    /**
+     * @var int
+     */
+    protected $end;
+
+    /**
+     * Hash of the message
+     *
+     * @var string|null
+     */
+    protected $hash = null;
+
+    /**
+     * Announcement constructor
+     *
+     * @param array $properties
+     */
+    public function __construct(array $properties = array())
+    {
+        foreach ($properties as $key => $value) {
+            $method = 'set' . ucfirst($key);
+            if (method_exists($this, $method)) {
+                $this->$method($value);
+            }
+        }
+    }
+
+    /**
+     * Get the author of the acknowledged
+     *
+     * @return string
+     */
+    public function getAuthor()
+    {
+        return $this->author;
+    }
+
+    /**
+     * Set the author of the acknowledged
+     *
+     * @param   string $author
+     *
+     * @return  $this
+     */
+    public function setAuthor($author)
+    {
+        $this->author = $author;
+        return $this;
+    }
+
+    /**
+     * Get the message of the acknowledged
+     *
+     * @return string
+     */
+    public function getMessage()
+    {
+        return $this->message;
+    }
+
+    /**
+     * Set the message of the acknowledged
+     *
+     * @param   string $message
+     *
+     * @return  $this
+     */
+    public function setMessage($message)
+    {
+        $this->message = $message;
+        $this->hash = null;
+        return $this;
+    }
+
+    /**
+     * Get the start date and time of the acknowledged
+     *
+     * @return int
+     */
+    public function getStart()
+    {
+        return $this->start;
+    }
+
+    /**
+     * Set the start date and time of the acknowledged
+     *
+     * @param   int $start
+     *
+     * @return  $this
+     */
+    public function setStart($start)
+    {
+        $this->start = $start;
+        return $this;
+    }
+
+    /**
+     * Get the end date and time of the acknowledged
+     *
+     * @return int
+     */
+    public function getEnd()
+    {
+        return $this->end;
+    }
+
+    /**
+     * Set the end date and time of the acknowledged
+     *
+     * @param   int $end
+     *
+     * @return  $this
+     */
+    public function setEnd($end)
+    {
+        $this->end = $end;
+        return $this;
+    }
+
+    /**
+     * Get the hash of the acknowledgement
+     *
+     * @return string
+     */
+    public function getHash()
+    {
+        if ($this->hash === null) {
+            $this->hash = md5($this->message);
+        }
+        return $this->hash;
+    }
+}
diff --git a/library/Icinga/Web/Announcement/AnnouncementCookie.php b/library/Icinga/Web/Announcement/AnnouncementCookie.php
new file mode 100644
index 0000000..6d23872
--- /dev/null
+++ b/library/Icinga/Web/Announcement/AnnouncementCookie.php
@@ -0,0 +1,138 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Announcement;
+
+use Icinga\Util\Json;
+use Icinga\Web\Cookie;
+
+/**
+ * Handle acknowledged announcements via cookie
+ */
+class AnnouncementCookie extends Cookie
+{
+    /**
+     * Array of hashes representing acknowledged announcements
+     *
+     * @var string[]
+     */
+    protected $acknowledged = array();
+
+    /**
+     * ETag of the last known announcements.ini
+     *
+     * @var string
+     */
+    protected $etag;
+
+    /**
+     * Timestamp of the next active acknowledgement, if any
+     *
+     * @var int|null
+     */
+    protected $nextActive;
+
+    /**
+     * AnnouncementCookie constructor
+     */
+    public function __construct()
+    {
+        parent::__construct('icingaweb2-announcements');
+        $this->setExpire(2147483648);
+        if (isset($_COOKIE['icingaweb2-announcements'])) {
+            $cookie = json_decode($_COOKIE['icingaweb2-announcements'], true);
+            if ($cookie !== null) {
+                if (isset($cookie['acknowledged'])) {
+                    $this->setAcknowledged($cookie['acknowledged']);
+                }
+                if (isset($cookie['etag'])) {
+                    $this->setEtag($cookie['etag']);
+                }
+                if (isset($cookie['next'])) {
+                    $this->setNextActive($cookie['next']);
+                }
+            }
+        }
+    }
+
+    /**
+     * Get the hashes of the acknowledged announcements
+     *
+     * @return  string[]
+     */
+    public function getAcknowledged()
+    {
+        return $this->acknowledged;
+    }
+
+    /**
+     * Set the hashes of the acknowledged announcements
+     *
+     * @param   string[] $acknowledged
+     *
+     * @return  $this
+     */
+    public function setAcknowledged(array $acknowledged)
+    {
+        $this->acknowledged = $acknowledged;
+        return $this;
+    }
+
+    /**
+     * Get the ETag
+     *
+     * @return  string
+     */
+    public function getEtag()
+    {
+        return $this->etag;
+    }
+
+    /**
+     * Set the ETag
+     *
+     * @param   string $etag
+     *
+     * @return  $this
+     */
+    public function setEtag($etag)
+    {
+        $this->etag = $etag;
+        return $this;
+    }
+
+    /**
+     * Get the timestamp of the next active announcement
+     *
+     * @return ?int
+     */
+    public function getNextActive()
+    {
+        return $this->nextActive;
+    }
+
+    /**
+     * Set the timestamp of the next active announcement
+     *
+     * @param ?int $nextActive
+     *
+     * @return  $this
+     */
+    public function setNextActive(?int $nextActive)
+    {
+        $this->nextActive = $nextActive;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValue()
+    {
+        return Json::encode(array(
+            'acknowledged'  => $this->getAcknowledged(),
+            'etag'          => $this->getEtag(),
+            'next'          => $this->getNextActive()
+        ));
+    }
+}
diff --git a/library/Icinga/Web/Announcement/AnnouncementIniRepository.php b/library/Icinga/Web/Announcement/AnnouncementIniRepository.php
new file mode 100644
index 0000000..d972a1d
--- /dev/null
+++ b/library/Icinga/Web/Announcement/AnnouncementIniRepository.php
@@ -0,0 +1,152 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Announcement;
+
+use DateTime;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Filter\Filter;
+use Icinga\Data\Filter\FilterAnd;
+use Icinga\Data\SimpleQuery;
+use Icinga\Repository\IniRepository;
+use Icinga\Web\Announcement;
+
+/**
+ * A collection of announcements stored in an INI file
+ */
+class AnnouncementIniRepository extends IniRepository
+{
+    protected $queryColumns = array('announcement' => array('id', 'author', 'message', 'hash', 'start', 'end'));
+
+    protected $triggers = array('announcement');
+
+    protected $configs = array('announcement' => array(
+        'name'      => 'announcements',
+        'keyColumn' => 'id'
+    ));
+
+    protected $conversionRules = array('announcement' => array(
+        'start' => 'timestamp',
+        'end'   => 'timestamp'
+    ));
+
+    /**
+     * Get a DateTime's timestamp
+     *
+     * @param   DateTime    $datetime
+     *
+     * @return  int|null
+     */
+    protected function persistTimestamp(DateTime $datetime)
+    {
+        return $datetime === null ? null : $datetime->getTimestamp();
+    }
+
+    /**
+     * Before-insert trigger (per row)
+     *
+     * @param   ConfigObject    $new    The original data to insert
+     *
+     * @return  ConfigObject            The eventually modified data to insert
+     */
+    protected function onInsertAnnouncement(ConfigObject $new)
+    {
+        if (! isset($new->id)) {
+            $new->id = uniqid();
+        }
+
+        if (! isset($new->hash)) {
+            $announcement = new Announcement($new->toArray());
+            $new->hash = $announcement->getHash();
+        }
+
+        return $new;
+    }
+
+    /**
+     * Before-update trigger (per row)
+     *
+     * @param   ConfigObject    $old    The original data as currently stored
+     * @param   ConfigObject    $new    The original data to update
+     *
+     * @return  ConfigObject            The eventually modified data to update
+     */
+    protected function onUpdateAnnouncement(ConfigObject $old, ConfigObject $new)
+    {
+        if ($new->message !== $old->message) {
+            $announcement = new Announcement($new->toArray());
+            $new->hash = $announcement->getHash();
+        }
+
+        return $new;
+    }
+
+    /**
+     * Get the ETag of the announcements.ini file
+     *
+     * @return  string
+     */
+    public function getEtag()
+    {
+        $file = $this->getDataSource('announcement')->getConfigFile();
+
+        if (@is_readable($file)) {
+            $mtime = filemtime($file);
+            $size = filesize($file);
+
+            return hash('crc32', $mtime . $size);
+        }
+
+        return null;
+    }
+
+    /**
+     * Get the query for all active announcements
+     *
+     * @return  SimpleQuery
+     */
+    public function findActive()
+    {
+        $now = new DateTime();
+
+        $query = $this
+            ->select(array('hash', 'message', 'start'))
+            ->setFilter(new FilterAnd(array(
+                Filter::expression('start', '<=', $now),
+                Filter::expression('end', '>=', $now)
+            )))
+            ->order('start');
+
+        return $query;
+    }
+
+    /**
+     * Get the timestamp of the next active announcement
+     *
+     * @return  int|null
+     */
+    public function findNextActive()
+    {
+        $now = new DateTime();
+
+        $query = $this
+            ->select(array('start', 'end'))
+            ->setFilter(Filter::matchAny(array(
+                Filter::expression('start', '>', $now), Filter::expression('end', '>', $now)
+            )));
+
+        $refresh = null;
+
+        foreach ($query as $row) {
+            $min = min($row->start, $row->end);
+
+            if ($refresh === null) {
+                $refresh = $min;
+            } else {
+                $refresh = min($refresh, $min);
+            }
+        }
+
+        return $refresh;
+    }
+}
diff --git a/library/Icinga/Web/ApplicationStateCookie.php b/library/Icinga/Web/ApplicationStateCookie.php
new file mode 100644
index 0000000..e40c17b
--- /dev/null
+++ b/library/Icinga/Web/ApplicationStateCookie.php
@@ -0,0 +1,74 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Logger;
+use Icinga\Authentication\Auth;
+use Icinga\Exception\Json\JsonDecodeException;
+use Icinga\Util\Json;
+
+/**
+ * Handle acknowledged application state messages via cookie
+ */
+class ApplicationStateCookie extends Cookie
+{
+    /** @var array */
+    protected $acknowledgedMessages = [];
+
+    public function __construct()
+    {
+        parent::__construct('icingaweb2-application-state');
+
+        $this->setExpire(2147483648);
+
+        if (isset($_COOKIE['icingaweb2-application-state'])) {
+            try {
+                $cookie = Json::decode($_COOKIE['icingaweb2-application-state'], true);
+            } catch (JsonDecodeException $e) {
+                Logger::error(
+                    "Can't decode the application state cookie of user '%s'. An error occurred: %s",
+                    Auth::getInstance()->getUser()->getUsername(),
+                    $e
+                );
+
+                return;
+            }
+
+            if (isset($cookie['acknowledged-messages'])) {
+                $this->setAcknowledgedMessages($cookie['acknowledged-messages']);
+            }
+        }
+    }
+
+    /**
+     * Get the acknowledged messages
+     *
+     * @return  array
+     */
+    public function getAcknowledgedMessages()
+    {
+        return $this->acknowledgedMessages;
+    }
+
+    /**
+     * Set the acknowledged messages
+     *
+     * @param   array $acknowledged
+     *
+     * @return  $this
+     */
+    public function setAcknowledgedMessages(array $acknowledged)
+    {
+        $this->acknowledgedMessages = $acknowledged;
+
+        return $this;
+    }
+
+    public function getValue()
+    {
+        return Json::encode([
+            'acknowledged-messages' => $this->getAcknowledgedMessages()
+        ]);
+    }
+}
diff --git a/library/Icinga/Web/Controller.php b/library/Icinga/Web/Controller.php
new file mode 100644
index 0000000..008fbf6
--- /dev/null
+++ b/library/Icinga/Web/Controller.php
@@ -0,0 +1,264 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Data\Filterable;
+use Icinga\Data\Sortable;
+use Icinga\Data\QueryInterface;
+use Icinga\Exception\Http\HttpBadRequestException;
+use Icinga\Exception\Http\HttpNotFoundException;
+use Icinga\Web\Controller\ModuleActionController;
+use Icinga\Web\Widget\Limiter;
+use Icinga\Web\Widget\Paginator;
+use Icinga\Web\Widget\SortBox;
+
+/**
+ * This is the controller all modules should inherit from
+ * We will flip code with the ModuleActionController as soon as a couple
+ * of pending feature branches are merged back to the master.
+ *
+ * @property View $view
+ */
+class Controller extends ModuleActionController
+{
+    /**
+     * Cache for page size configured via user preferences
+     *
+     * @var false|int
+     */
+    protected $userPageSize;
+
+    /**
+     * @see ActionController::init
+     */
+    public function init()
+    {
+        parent::init();
+        $this->handleSortControlSubmit();
+    }
+
+    /**
+     * Check whether the sort control has been submitted and redirect using GET parameters
+     */
+    protected function handleSortControlSubmit()
+    {
+        $request = $this->getRequest();
+        if (! $request->isPost()) {
+            return;
+        }
+
+        if (($sort = $request->getPost('sort')) || ($direction = $request->getPost('dir'))) {
+            $url = Url::fromRequest();
+            if ($sort) {
+                $url->setParam('sort', $sort);
+                $url->remove('dir');
+            } else {
+                $url->setParam('dir', $direction);
+            }
+
+            $this->redirectNow($url);
+        }
+    }
+
+    /**
+     * Immediately respond w/ HTTP 400
+     *
+     * @param   string  $message    Exception message or exception format string
+     * @param   mixed   ...$arg     Format string argument
+     *
+     * @throws  HttpBadRequestException
+     */
+    public function httpBadRequest($message)
+    {
+        throw HttpBadRequestException::create(func_get_args());
+    }
+
+    /**
+     * Immediately respond w/ HTTP 404
+     *
+     * @param   string  $message    Exception message or exception format string
+     * @param   mixed   ...$arg     Format string argument
+     *
+     * @throws  HttpNotFoundException
+     */
+    public function httpNotFound($message)
+    {
+        throw HttpNotFoundException::create(func_get_args());
+    }
+
+    /**
+     * Render the given form using a simple view script
+     *
+     * @param   Form    $form
+     * @param   string  $tab
+     */
+    public function renderForm(Form $form, $tab)
+    {
+        $this->getTabs()->add(uniqid(), array(
+            'active'    => true,
+            'label'     => $tab,
+            'url'       => Url::fromRequest()
+        ));
+        $this->view->form = $form;
+        $this->render('simple-form', null, true);
+    }
+
+    /**
+     * Create a SortBox widget and apply its sort rules on the given query
+     *
+     * The widget is set on the `sortBox' view property only if the current view has not been requested as compact
+     *
+     * @param   array       $columns    An array containing the sort columns, with the
+     *                                  submit value as the key and the label as the value
+     * @param   Sortable    $query      Query to apply the user chosen sort rules on
+     * @param   array       $defaults   An array containing default sort directions for specific columns
+     *
+     * @return  $this
+     */
+    protected function setupSortControl(array $columns, Sortable $query = null, array $defaults = null)
+    {
+        $request = $this->getRequest();
+        $sortBox = SortBox::create('sortbox-' . $request->getActionName(), $columns, $defaults);
+        $sortBox->setRequest($request);
+
+        if ($query) {
+            $sortBox->setQuery($query);
+            $sortBox->handleRequest($request);
+        }
+
+        if (! $this->view->compact) {
+            $this->view->sortBox = $sortBox;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Create a Limiter widget at the `limiter' view property
+     *
+     * In case the current view has been requested as compact this method does nothing.
+     *
+     * @param   int             $itemsPerPage   Default number of items per page
+     *
+     * @return  $this
+     */
+    protected function setupLimitControl($itemsPerPage = 25)
+    {
+        if (! $this->view->compact) {
+            $this->view->limiter = new Limiter();
+            $this->view->limiter->setDefaultLimit($this->getPageSize($itemsPerPage));
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get the page size configured via user preferences or return the default value
+     *
+     * @param   ?int $default
+     *
+     * @return  int
+     */
+    protected function getPageSize($default)
+    {
+        if ($this->userPageSize === null) {
+            $user = $this->Auth()->getUser();
+            if ($user !== null) {
+                $pageSize = $user->getPreferences()->getValue('icingaweb', 'default_page_size');
+                $this->userPageSize = $pageSize ? (int) $pageSize : false;
+            } else {
+                $this->userPageSize = false;
+            }
+        }
+
+        return $this->userPageSize !== false ? $this->userPageSize : $default;
+    }
+
+    /**
+     * Apply the given page limit and number on the given query and setup a paginator for it
+     *
+     * The $itemsPerPage and $pageNumber parameters are only applied if not available in the current request.
+     * The paginator is set on the `paginator' view property only if the current view has not been requested as compact.
+     *
+     * @param   QueryInterface  $query          The query to create a paginator for
+     * @param   int             $itemsPerPage   Default number of items per page
+     * @param   int             $pageNumber     Default page number
+     *
+     * @return  $this
+     */
+    protected function setupPaginationControl(QueryInterface $query, $itemsPerPage = 25, $pageNumber = 0)
+    {
+        $request = $this->getRequest();
+        $limit = $request->getParam('limit', $this->getPageSize($itemsPerPage));
+        $page = $request->getParam('page', $pageNumber);
+        $query->limit($limit, $page > 0 ? ($page - 1) * $limit : 0);
+
+        if (! $this->view->compact) {
+            $paginator = new Paginator();
+            $paginator->setQuery($query);
+            $this->view->paginator = $paginator;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Create a FilterEditor widget and apply the user's chosen filter options on the given filterable
+     *
+     * The widget is set on the `filterEditor' view property only if the current view has not been requested as compact.
+     * The optional $filterColumns parameter should be an array of key-value pairs where the key is the name of the
+     * column and the value the label to show to the user. The optional $searchColumns parameter should be an array
+     * of column names to be used to handle quick searches.
+     *
+     * If the given filterable is an instance of Icinga\Data\FilterColumns, $filterable->getFilterColumns() and
+     * $filterable->getSearchColumns() is called to provide the respective columns if $filterColumns or $searchColumns
+     * is not given.
+     *
+     * @param   Filterable  $filterable         The filterable to create a filter editor for
+     * @param   array       $filterColumns      The filter columns to offer to the user
+     * @param   array       $searchColumns      The search columns to utilize for quick searches
+     * @param   array       $preserveParams     The url parameters to preserve
+     *
+     * @return  $this
+     *
+     * @todo    Preserving and ignoring parameters should be configurable (another two method params? property magic?)
+     */
+    protected function setupFilterControl(
+        Filterable $filterable,
+        array $filterColumns = null,
+        array $searchColumns = null,
+        array $preserveParams = null
+    ) {
+        $defaultPreservedParams = array(
+            'limit', // setupPaginationControl()
+            'sort', // setupSortControl()
+            'dir', // setupSortControl()
+            'backend', // Framework
+            'showCompact', // Framework
+            '_dev' // Framework
+        );
+
+        $editor = Widget::create('filterEditor');
+        /** @var \Icinga\Web\Widget\FilterEditor $editor */
+        call_user_func_array(
+            array($editor, 'preserveParams'),
+            array_merge($defaultPreservedParams, $preserveParams ?: array())
+        );
+
+        $editor
+            ->setQuery($filterable)
+            ->ignoreParams('page') // setupPaginationControl()
+            ->setColumns($filterColumns)
+            ->setSearchColumns($searchColumns)
+            ->handleRequest($this->getRequest());
+
+        if ($this->view->compact) {
+            $editor->setVisible(false);
+        }
+
+        $this->view->filterEditor = $editor;
+
+        return $this;
+    }
+}
diff --git a/library/Icinga/Web/Controller/ActionController.php b/library/Icinga/Web/Controller/ActionController.php
new file mode 100644
index 0000000..2e36d7d
--- /dev/null
+++ b/library/Icinga/Web/Controller/ActionController.php
@@ -0,0 +1,617 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use Icinga\Application\Modules\Module;
+use Icinga\Common\PdfExport;
+use Icinga\File\Pdf;
+use Icinga\Util\Csp;
+use Icinga\Web\View;
+use ipl\I18n\Translation;
+use Zend_Controller_Action;
+use Zend_Controller_Action_HelperBroker;
+use Zend_Controller_Request_Abstract;
+use Zend_Controller_Response_Abstract;
+use Icinga\Application\Benchmark;
+use Icinga\Application\Config;
+use Icinga\Authentication\Auth;
+use Icinga\Exception\Http\HttpMethodNotAllowedException;
+use Icinga\Exception\IcingaException;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Forms\AutoRefreshForm;
+use Icinga\Security\SecurityException;
+use Icinga\Web\Session;
+use Icinga\Web\Url;
+use Icinga\Web\UrlParams;
+use Icinga\Web\Widget\Tabs;
+use Icinga\Web\Window;
+
+/**
+ * Base class for all core action controllers
+ *
+ * All Icinga Web core controllers should extend this class
+ *
+ * @method \Icinga\Web\Request getRequest() {
+ *     {@inheritdoc}
+ *     @return  \Icinga\Web\Request
+ * }
+ *
+ * @method \Icinga\Web\Response getResponse() {
+ *     {@inheritdoc}
+ *     @return  \Icinga\Web\Response
+ * }
+ */
+class ActionController extends Zend_Controller_Action
+{
+    use Translation;
+    use PdfExport {
+        sendAsPdf as private newSendAsPdf;
+    }
+
+    /**
+     * The login route to use when requiring authentication
+     */
+    const LOGIN_ROUTE = 'authentication/login';
+
+    /**
+     * The default page title to use
+     */
+    const DEFAULT_TITLE = 'Icinga Web';
+
+    /**
+     * Whether the controller requires the user to be authenticated
+     *
+     * @var bool
+     */
+    protected $requiresAuthentication = true;
+
+    /**
+     * The current module's name
+     *
+     * @var string
+     */
+    protected $moduleName;
+
+    /**
+     * A page's automatic refresh interval
+     *
+     * The initial value will not be subject to a user's preferences.
+     *
+     * @var int
+     */
+    protected $autorefreshInterval;
+
+    protected $reloadCss = false;
+
+    protected $window;
+
+    protected $rerenderLayout = false;
+
+    /**
+     * The inline layout (inside columns) to use
+     *
+     * @var string
+     */
+    protected $inlineLayout = 'inline';
+
+    /**
+     * The inner layout (inside the body) to use
+     *
+     * @var string
+     */
+    protected $innerLayout = 'body';
+
+    /**
+     * Authentication manager
+     *
+     * @var Auth|null
+     */
+    protected $auth;
+
+    /**
+     * URL parameters
+     *
+     * @var UrlParams
+     */
+    protected $params;
+
+    /**
+     * @var View
+     */
+    public $view;
+
+    /**
+     * The constructor starts benchmarking, loads the configuration and sets
+     * other useful controller properties
+     *
+     * @param Zend_Controller_Request_Abstract  $request
+     * @param Zend_Controller_Response_Abstract $response
+     * @param array                             $invokeArgs Any additional invocation arguments
+     */
+    public function __construct(
+        Zend_Controller_Request_Abstract $request,
+        Zend_Controller_Response_Abstract $response,
+        array $invokeArgs = array()
+    ) {
+        /** @var \Icinga\Web\Request $request */
+        /** @var \Icinga\Web\Response $response */
+        $this->params = UrlParams::fromQueryString();
+
+        $this->setRequest($request)
+            ->setResponse($response)
+            ->_setInvokeArgs($invokeArgs);
+        $this->_helper = new Zend_Controller_Action_HelperBroker($this);
+
+        $moduleName = $this->getModuleName();
+        $this->view->defaultTitle = static::DEFAULT_TITLE;
+        $this->translationDomain = $moduleName !== 'default' ? $moduleName : 'icinga';
+        $this->view->translationDomain = $this->translationDomain;
+        $this->_helper->layout()->isIframe = $request->getUrl()->shift('isIframe');
+        $this->_helper->layout()->showFullscreen = $request->getUrl()->shift('showFullscreen');
+        $this->_helper->layout()->moduleName = $moduleName;
+
+        $this->view->compact = false;
+        if ($request->getUrl()->getParam('view') === 'compact') {
+            $request->getUrl()->remove('view');
+            $this->view->compact = true;
+        }
+        if ($request->getUrl()->shift('showCompact')) {
+            $this->view->compact = true;
+        }
+        $this->rerenderLayout = $request->getUrl()->shift('renderLayout');
+        if ($request->getUrl()->shift('_disableLayout')) {
+            $this->_helper->layout()->disableLayout();
+        }
+
+        // $auth->authenticate($request, $response, $this->requiresLogin());
+        if ($this->requiresLogin()) {
+            if (! $request->isXmlHttpRequest() && $request->isApiRequest()) {
+                Auth::getInstance()->challengeHttp();
+            }
+            $this->redirectToLogin(Url::fromRequest());
+        }
+
+        if (! $this->isXhr() && Config::app()->get('security', 'use_strict_csp', false)) {
+            Csp::createNonce();
+        }
+
+        $this->view->tabs = new Tabs();
+        $this->prepareInit();
+        $this->init();
+    }
+
+    /**
+     * Prepare controller initialization
+     *
+     * As it should not be required for controllers to call the parent's init() method, base controllers should use
+     * prepareInit() in order to prepare the controller initialization.
+     *
+     * @see \Zend_Controller_Action::init() For the controller initialization method.
+     */
+    protected function prepareInit()
+    {
+    }
+
+    /**
+     * Get the authentication manager
+     *
+     * @return Auth
+     */
+    public function Auth()
+    {
+        if ($this->auth === null) {
+            $this->auth = Auth::getInstance();
+        }
+        return $this->auth;
+    }
+
+    /**
+     * Whether the current user has the given permission
+     *
+     * @param   string  $permission Name of the permission
+     *
+     * @return  bool
+     */
+    public function hasPermission($permission)
+    {
+        return $this->Auth()->hasPermission($permission);
+    }
+
+    /**
+     * Assert that the current user has the given permission
+     *
+     * @param   string  $permission     Name of the permission
+     *
+     * @throws  SecurityException       If the current user lacks the given permission
+     */
+    public function assertPermission($permission)
+    {
+        if (! $this->Auth()->hasPermission($permission)) {
+            throw new SecurityException('No permission for %s', $permission);
+        }
+    }
+
+    /**
+     * Return the current module's name
+     *
+     * @return  string
+     */
+    public function getModuleName()
+    {
+        if ($this->moduleName === null) {
+            $this->moduleName = $this->getRequest()->getModuleName();
+        }
+
+        return $this->moduleName;
+    }
+
+    public function Config($file = null)
+    {
+        if ($file === null) {
+            return Config::app();
+        } else {
+            return Config::app($file);
+        }
+    }
+
+    public function Window()
+    {
+        if ($this->window === null) {
+            $this->window = Window::getInstance();
+        }
+
+        return $this->window;
+    }
+
+    protected function reloadCss()
+    {
+        $this->reloadCss = true;
+        return $this;
+    }
+
+    /**
+     * Respond with HTTP 405 if the current request's method is not one of the given methods
+     *
+     * @param   string $httpMethod              Unlimited number of allowed HTTP methods
+     *
+     * @throws  HttpMethodNotAllowedException   If the request method is not one of the given methods
+     */
+    public function assertHttpMethod($httpMethod)
+    {
+        $httpMethods = array_flip(array_map('strtoupper', func_get_args()));
+        if (! isset($httpMethods[$this->getRequest()->getMethod()])) {
+            $e = new HttpMethodNotAllowedException($this->translate('Method Not Allowed'));
+            $e->setAllowedMethods(implode(', ', array_keys($httpMethods)));
+            throw $e;
+        }
+    }
+
+    /**
+     * Return restriction information for an eventually authenticated user
+     *
+     * @param   string  $name   Restriction name
+     *
+     * @return  array
+     */
+    public function getRestrictions($name)
+    {
+        return $this->Auth()->getRestrictions($name);
+    }
+
+    /**
+     * Check whether the controller requires a login. That is when the controller requires authentication and the
+     * user is currently not authenticated
+     *
+     * @return  bool
+     */
+    protected function requiresLogin()
+    {
+        if (! $this->requiresAuthentication) {
+            return false;
+        }
+
+        return ! $this->Auth()->isAuthenticated();
+    }
+
+    /**
+     * Return the tabs
+     *
+     * @return Tabs
+     */
+    public function getTabs()
+    {
+        return $this->view->tabs;
+    }
+
+    protected function ignoreXhrBody()
+    {
+        if ($this->isXhr()) {
+            $this->getResponse()->setHeader('X-Icinga-Container', 'ignore');
+        }
+    }
+
+    /**
+     * Set the interval (in seconds) at which the page should automatically refresh
+     *
+     * This may be adjusted based on the user's preferences. The result could be a
+     * lower or higher rate of the page's automatic refresh. If this is not desired,
+     * the only way to bypass this is to initialize the {@see ActionController::$autorefreshInterval}
+     * property or to set the `autorefreshInterval` property of the layout directly.
+     *
+     * @param int $interval
+     *
+     * @return $this
+     */
+    public function setAutorefreshInterval($interval)
+    {
+        if (! is_int($interval) || $interval < 1) {
+            throw new ProgrammingError(
+                'Setting autorefresh interval smaller than 1 second is not allowed'
+            );
+        }
+
+        $user = $this->getRequest()->getUser();
+        if ($user !== null) {
+            $speed = (float) $user->getPreferences()->getValue('icingaweb', 'auto_refresh_speed', 1.0);
+            $interval = max(round($interval * $speed), min($interval, 5));
+        }
+
+        $this->autorefreshInterval = $interval;
+
+        return $this;
+    }
+
+    public function disableAutoRefresh()
+    {
+        $this->autorefreshInterval = null;
+
+        return $this;
+    }
+
+    /**
+     * Redirect to login
+     *
+     * XHR will always redirect to __SELF__ if an URL to redirect to after successful login is set. __SELF__ instructs
+     * JavaScript to redirect to the current window's URL if it's an auto-refresh request or to redirect to the URL
+     * which required login if it's not an auto-refreshing one.
+     *
+     * XHR will respond with HTTP status code 403 Forbidden.
+     *
+     * @param   Url|string  $redirect   URL to redirect to after successful login
+     */
+    protected function redirectToLogin($redirect = null)
+    {
+        $login = Url::fromPath(static::LOGIN_ROUTE);
+        if ($this->isXhr()) {
+            if ($redirect !== null) {
+                $login->setParam('redirect', '__SELF__');
+            }
+
+            $this->_response->setHttpResponseCode(403);
+        } elseif ($redirect !== null) {
+            if (! $redirect instanceof Url) {
+                $redirect = Url::fromPath($redirect);
+            }
+
+            if (($relativeUrl = $redirect->getRelativeUrl())) {
+                $login->setParam('redirect', $relativeUrl);
+            }
+        }
+
+        $this->getResponse()->setReloadWindow(true);
+        $this->redirectNow($login);
+    }
+
+    protected function rerenderLayout()
+    {
+        $this->rerenderLayout = true;
+        return $this;
+    }
+
+    public function isXhr()
+    {
+        return $this->getRequest()->isXmlHttpRequest();
+    }
+
+    /**
+     * Issue a redirect that's performed with XHR by the client
+     *
+     * @param Url|string $url
+     *
+     * @return never
+     */
+    protected function redirectXhr($url)
+    {
+        $response = $this->getResponse();
+
+        if ($this->reloadCss) {
+            $response->setReloadCss(true);
+        }
+
+        if ($this->rerenderLayout) {
+            $response->setRerenderLayout(true);
+        }
+
+        $response->redirectAndExit($url);
+    }
+
+    /**
+     * Issue a redirect that's performed as a native HTTP request by the client
+     *
+     * This will effectively reload the window
+     *
+     * @param Url|string $url
+     *
+     * @return never
+     */
+    protected function redirectHttp($url)
+    {
+        if ($this->isXhr()) {
+            $this->getResponse()->setHeader('X-Icinga-Redirect-Http', 'yes');
+        }
+
+        $this->getResponse()->redirectAndExit($url);
+    }
+
+    /**
+    *  Redirect to a specific url, updating the browsers URL field
+    *
+    *  @param Url|string $url The target to redirect to
+     *
+     * @return never
+    **/
+    public function redirectNow($url)
+    {
+        if ($this->isXhr()) {
+            $this->redirectXhr($url);
+        } else {
+            $this->redirectHttp($url);
+        }
+    }
+
+    /**
+     * @see Zend_Controller_Action::preDispatch()
+     */
+    public function preDispatch()
+    {
+        $form = new AutoRefreshForm();
+        if (! $this->getRequest()->isApiRequest()) {
+            $form->handleRequest();
+        }
+        $this->_helper->layout()->autoRefreshForm = $form;
+    }
+
+    /**
+     * Detect whether the current request requires changes in the layout and apply them before rendering
+     *
+     * @see Zend_Controller_Action::postDispatch()
+     */
+    public function postDispatch()
+    {
+        Benchmark::measure('Action::postDispatch()');
+
+        $req = $this->getRequest();
+        $layout = $this->_helper->layout();
+        $layout->innerLayout = $this->innerLayout;
+        $layout->inlineLayout = $this->inlineLayout;
+
+        if ($user = $req->getUser()) {
+            if ((bool) $user->getPreferences()->getValue('icingaweb', 'show_benchmark', false)) {
+                if ($this->_helper->layout()->isEnabled()) {
+                    $layout->benchmark = $this->renderBenchmark();
+                }
+            }
+
+            if (! (bool) $user->getPreferences()->getValue('icingaweb', 'auto_refresh', true)) {
+                $this->disableAutoRefresh();
+            }
+        }
+
+        if ($this->autorefreshInterval !== null) {
+            $layout->autorefreshInterval = $this->autorefreshInterval;
+        }
+
+        if ($req->getParam('error_handler') === null && $req->getParam('format') === 'pdf') {
+            $this->sendAsPdf();
+            $this->shutdownSession();
+            exit;
+        }
+
+        if ($this->isXhr()) {
+            $this->postDispatchXhr();
+        }
+
+        $this->shutdownSession();
+    }
+
+    protected function postDispatchXhr()
+    {
+        $resp = $this->getResponse();
+
+        if ($this->reloadCss) {
+            $resp->setReloadCss(true);
+        }
+
+        if ($this->view->title) {
+            if (preg_match('~[\r\n]~', $this->view->title)) {
+                // TODO: Innocent exception and error log for hack attempts
+                throw new IcingaException('No way, guy');
+            }
+            $resp->setHeader(
+                'X-Icinga-Title',
+                rawurlencode($this->view->title . ' :: ' . $this->view->defaultTitle),
+                true
+            );
+        } else {
+            $resp->setHeader('X-Icinga-Title', rawurlencode($this->view->defaultTitle), true);
+        }
+
+        $layout = $this->_helper->layout();
+        if ($this->rerenderLayout) {
+            $layout->setLayout($this->innerLayout);
+            $resp->setRerenderLayout(true);
+        } else {
+            // The layout may be disabled and there's no indication that the layout is explicitly desired,
+            // that's why we're passing false as second parameter to setLayout
+            $layout->setLayout($this->inlineLayout, false);
+        }
+
+        if ($this->autorefreshInterval !== null) {
+            $resp->setAutoRefreshInterval($this->autorefreshInterval);
+        }
+    }
+
+    protected function sendAsPdf()
+    {
+        if (Module::exists('pdfexport')) {
+            $this->newSendAsPdf();
+        } else {
+            $pdf = new Pdf();
+            $pdf->renderControllerAction($this);
+        }
+    }
+
+    protected function shutdownSession()
+    {
+        $session = Session::getSession();
+        if ($session->hasChanged()) {
+            $session->write();
+        }
+    }
+
+    /**
+     * Render the benchmark
+     *
+     * @return string Benchmark HTML
+     */
+    protected function renderBenchmark()
+    {
+        $this->_helper->viewRenderer->postDispatch();
+        Benchmark::measure('Response ready');
+        return Benchmark::renderToHtml();
+    }
+
+    /**
+     * Try to call compatible methods from older zend versions
+     *
+     * Methods like getParam and redirect are _getParam/_redirect in older Zend versions (which reside for example
+     * in Debian Wheezy). Using those methods without the "_" causes the application to fail on those platforms, but
+     * using the version with "_" forces us to use deprecated code. So we try to catch this issue by looking for methods
+     * with the same name, but with a "_" prefix prepended.
+     *
+     * @param   string  $name   The method name to check
+     * @param   mixed   $params The method parameters
+     * @return  mixed           Anything the method returns
+     */
+    public function __call($name, $params)
+    {
+        $deprecatedMethod = '_' . $name;
+
+        if (method_exists($this, $deprecatedMethod)) {
+            return call_user_func_array(array($this, $deprecatedMethod), $params);
+        }
+
+        parent::__call($name, $params);
+    }
+}
diff --git a/library/Icinga/Web/Controller/AuthBackendController.php b/library/Icinga/Web/Controller/AuthBackendController.php
new file mode 100644
index 0000000..12f8b72
--- /dev/null
+++ b/library/Icinga/Web/Controller/AuthBackendController.php
@@ -0,0 +1,151 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use ipl\Web\Compat\CompatController;
+use Zend_Controller_Action_Exception;
+use Icinga\Application\Config;
+use Icinga\Authentication\User\UserBackend;
+use Icinga\Authentication\User\UserBackendInterface;
+use Icinga\Authentication\UserGroup\UserGroupBackend;
+use Icinga\Authentication\UserGroup\UserGroupBackendInterface;
+
+/**
+ * Base class for authentication backend controllers
+ */
+class AuthBackendController extends CompatController
+{
+    public function init()
+    {
+        parent::init();
+
+        $this->tabs->disableLegacyExtensions();
+    }
+
+    /**
+     * Redirect to this controller's list action
+     */
+    public function indexAction()
+    {
+        $this->redirectNow($this->getRequest()->getControllerName() . '/list');
+    }
+
+    /**
+     * Return all user backends implementing the given interface
+     *
+     * @param   string  $interface      The class path of the interface, or null if no interface check should be made
+     *
+     * @return  array
+     */
+    protected function loadUserBackends($interface = null)
+    {
+        $backends = array();
+        foreach (Config::app('authentication') as $backendName => $backendConfig) {
+            $candidate = UserBackend::create($backendName, $backendConfig);
+            if (! $interface || $candidate instanceof $interface) {
+                $backends[] = $candidate;
+            }
+        }
+
+        return $backends;
+    }
+
+    /**
+     * Return the given user backend or the first match in order
+     *
+     * @param   string  $name           The name of the backend, or null in case the first match should be returned
+     * @param   string  $interface      The interface the backend should implement, no interface check if null
+     *
+     * @return  UserBackendInterface
+     *
+     * @throws  Zend_Controller_Action_Exception    In case the given backend name is invalid
+     */
+    protected function getUserBackend($name = null, $interface = 'Icinga\Data\Selectable')
+    {
+        $backend = null;
+        if ($name !== null) {
+            $config = Config::app('authentication');
+            if (! $config->hasSection($name)) {
+                $this->httpNotFound(sprintf($this->translate('Authentication backend "%s" not found'), $name));
+            } else {
+                $backend = UserBackend::create($name, $config->getSection($name));
+                if ($interface && !$backend instanceof $interface) {
+                    $interfaceParts = explode('\\', strtolower($interface));
+                    throw new Zend_Controller_Action_Exception(
+                        sprintf(
+                            $this->translate('Authentication backend "%s" is not %s'),
+                            $name,
+                            array_pop($interfaceParts)
+                        ),
+                        400
+                    );
+                }
+            }
+        } else {
+            $backends = $this->loadUserBackends($interface);
+            $backend = array_shift($backends);
+        }
+
+        return $backend;
+    }
+
+    /**
+     * Return all user group backends implementing the given interface
+     *
+     * @param   string  $interface      The class path of the interface, or null if no interface check should be made
+     *
+     * @return  array
+     */
+    protected function loadUserGroupBackends($interface = null)
+    {
+        $backends = array();
+        foreach (Config::app('groups') as $backendName => $backendConfig) {
+            $candidate = UserGroupBackend::create($backendName, $backendConfig);
+            if (! $interface || $candidate instanceof $interface) {
+                $backends[] = $candidate;
+            }
+        }
+
+        return $backends;
+    }
+
+    /**
+     * Return the given user group backend or the first match in order
+     *
+     * @param   string  $name           The name of the backend, or null in case the first match should be returned
+     * @param   string  $interface      The interface the backend should implement, no interface check if null
+     *
+     * @return  UserGroupBackendInterface
+     *
+     * @throws  Zend_Controller_Action_Exception    In case the given backend name is invalid
+     */
+    protected function getUserGroupBackend($name = null, $interface = 'Icinga\Data\Selectable')
+    {
+        $backend = null;
+        if ($name !== null) {
+            $config = Config::app('groups');
+            if (! $config->hasSection($name)) {
+                $this->httpNotFound(sprintf($this->translate('User group backend "%s" not found'), $name));
+            } else {
+                $backend = UserGroupBackend::create($name, $config->getSection($name));
+                if ($interface && !$backend instanceof $interface) {
+                    $interfaceParts = explode('\\', strtolower($interface));
+                    throw new Zend_Controller_Action_Exception(
+                        sprintf(
+                            $this->translate('User group backend "%s" is not %s'),
+                            $name,
+                            array_pop($interfaceParts)
+                        ),
+                        400
+                    );
+                }
+            }
+        } else {
+            $backends = $this->loadUserGroupBackends($interface);
+            $backend = array_shift($backends);
+        }
+
+        return $backend;
+    }
+}
diff --git a/library/Icinga/Web/Controller/BasePreferenceController.php b/library/Icinga/Web/Controller/BasePreferenceController.php
new file mode 100644
index 0000000..8f2da8f
--- /dev/null
+++ b/library/Icinga/Web/Controller/BasePreferenceController.php
@@ -0,0 +1,39 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+/**
+ *  Base class for Preference Controllers
+ *
+ *  Module preferences use this class to make sure they are automatically
+ *  added to the general preferences dialog. If you create a subclass of
+ *  BasePreferenceController and overwrite @see init(), make sure you call
+ *  parent::init(), otherwise you won't have the $tabs property in your view.
+ *
+ */
+class BasePreferenceController extends ActionController
+{
+    /**
+     * Return an array of tabs provided by this preference controller.
+     *
+     * Those tabs will automatically be added to the application's preference dialog
+     *
+     * @return array
+     */
+    public static function createProvidedTabs()
+    {
+        return array();
+    }
+
+    /**
+     *  Initialize the controller and collect all tabs for it from the application and its modules
+     *
+     *  @see ActionController::init()
+     */
+    public function init()
+    {
+        parent::init();
+        $this->view->tabs = ControllerTabCollector::collectControllerTabs('PreferenceController');
+    }
+}
diff --git a/library/Icinga/Web/Controller/ControllerTabCollector.php b/library/Icinga/Web/Controller/ControllerTabCollector.php
new file mode 100644
index 0000000..b452a20
--- /dev/null
+++ b/library/Icinga/Web/Controller/ControllerTabCollector.php
@@ -0,0 +1,97 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use Icinga\Application\Modules\Module;
+use Icinga\Application\Icinga;
+use Icinga\Web\Widget\Tabs;
+
+/**
+ *  Static helper class that collects tabs provided by the 'createProvidedTabs' method of controllers
+ */
+class ControllerTabCollector
+{
+    /**
+     * Scan all controllers with given name in the application and (loaded) module folders and collects their provided
+     * tabs
+     *
+     * @param   string  $controllerName The name of the controllers to use for tab collection
+     *
+     * @return  Tabs                    A {@link Tabs} instance containing the application tabs first followed by the
+     *                                  tabs provided from the modules
+     */
+    public static function collectControllerTabs($controllerName)
+    {
+        $controller = '\Icinga\\' . Dispatcher::CONTROLLER_NAMESPACE . '\\' . $controllerName;
+        $applicationTabs = $controller::createProvidedTabs();
+        $moduleTabs = self::collectModuleTabs($controllerName);
+
+        $tabs = new Tabs();
+        foreach ($applicationTabs as $name => $tab) {
+            $tabs->add($name, $tab);
+        }
+
+        foreach ($moduleTabs as $name => $tab) {
+            // Don't overwrite application tabs if the module wants to
+            if ($tabs->has($name)) {
+                continue;
+            }
+            $tabs->add($name, $tab);
+        }
+        return $tabs;
+    }
+
+    /**
+     * Collect module tabs for all modules containing the given controller
+     *
+     * @param string $controller        The controller name to use for tab collection
+     *
+     * @return array                    An array of Tabs objects or arrays containing Tab descriptions
+     */
+    private static function collectModuleTabs($controller)
+    {
+        $moduleManager = Icinga::app()->getModuleManager();
+        $modules = $moduleManager->listEnabledModules();
+        $tabs = array();
+        foreach ($modules as $module) {
+            $tabs += self::createModuleConfigurationTabs($controller, $moduleManager->getModule($module));
+        }
+
+        return $tabs;
+    }
+
+    /**
+     * Collects the tabs from the createProvidedTabs() method in the configuration controller
+     *
+     * If the module doesn't have the given controller or createProvidedTabs method in the controller an empty array
+     * will be returned
+     *
+     * @param   string  $controllerName The name of the controller that provides tabs via createProvidedTabs
+     * @param   Module  $module         The module instance that provides the controller
+     *
+     * @return  array
+     */
+    private static function createModuleConfigurationTabs($controllerName, Module $module)
+    {
+        // TODO(el): Only works for controllers w/o namepsace: https://dev.icinga.com/issues/4149
+        $controllerDir = $module->getControllerDir();
+        $name = $module->getName();
+
+        $controllerDir = $controllerDir . '/' . $controllerName . '.php';
+        $controllerName = ucfirst($name) . '_' . $controllerName;
+
+        if (is_readable($controllerDir)) {
+            require_once(realpath($controllerDir));
+            if (! method_exists($controllerName, 'createProvidedTabs')) {
+                return array();
+            }
+            $tab = $controllerName::createProvidedTabs();
+            if (! is_array($tab)) {
+                $tab = array($name => $tab);
+            }
+            return $tab;
+        }
+        return array();
+    }
+}
diff --git a/library/Icinga/Web/Controller/Dispatcher.php b/library/Icinga/Web/Controller/Dispatcher.php
new file mode 100644
index 0000000..e2dfb80
--- /dev/null
+++ b/library/Icinga/Web/Controller/Dispatcher.php
@@ -0,0 +1,93 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use Exception;
+use Icinga\Util\StringHelper;
+use Zend_Controller_Action;
+use Zend_Controller_Action_Interface;
+use Zend_Controller_Dispatcher_Exception;
+use Zend_Controller_Dispatcher_Standard;
+use Zend_Controller_Request_Abstract;
+use Zend_Controller_Response_Abstract;
+
+/**
+ * Dispatcher supporting Zend-style and namespaced controllers
+ *
+ * Does not support a namespaced default controller in combination w/ the Zend parameter useDefaultControllerAlways.
+ */
+class Dispatcher extends Zend_Controller_Dispatcher_Standard
+{
+    /**
+     * Controller namespace
+     *
+     * @var string
+     */
+    const CONTROLLER_NAMESPACE = 'Controllers';
+
+    /**
+     * Dispatch request to a controller and action
+     *
+     * @param   Zend_Controller_Request_Abstract  $request
+     * @param   Zend_Controller_Response_Abstract $response
+     *
+     * @throws  Zend_Controller_Dispatcher_Exception    If the controller is not an instance of
+     *                                                  Zend_Controller_Action_Interface
+     * @throws  Exception                               If dispatching the request fails
+     */
+    public function dispatch(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response)
+    {
+        $this->setResponse($response);
+        $controllerName = $request->getControllerName();
+        if (! $controllerName) {
+            parent::dispatch($request, $response);
+            return;
+        }
+        $controllerName = StringHelper::cname($controllerName, '-') . 'Controller';
+        $moduleName = $request->getModuleName();
+        if ($moduleName === null || $moduleName === $this->_defaultModule) {
+            $controllerClass = 'Icinga\\' . self::CONTROLLER_NAMESPACE . '\\' . $controllerName;
+        } else {
+            $controllerClass = 'Icinga\\Module\\' . ucfirst($moduleName) . '\\' . self::CONTROLLER_NAMESPACE . '\\'
+                . $controllerName;
+        }
+        if (! class_exists($controllerClass)) {
+            parent::dispatch($request, $response);
+            return;
+        }
+        $controller = new $controllerClass($request, $response, $this->getParams());
+        if (! $controller instanceof Zend_Controller_Action
+            && ! $controller instanceof Zend_Controller_Action_Interface
+        ) {
+            throw new Zend_Controller_Dispatcher_Exception(
+                'Controller "' . $controllerClass . '" is not an instance of Zend_Controller_Action_Interface'
+            );
+        }
+        $action = $this->getActionMethod($request);
+        $request->setDispatched(true);
+        // Buffer output by default
+        $disableOb = $this->getParam('disableOutputBuffering');
+        $obLevel = ob_get_level();
+        if (empty($disableOb)) {
+            ob_start();
+        }
+        try {
+            $controller->dispatch($action);
+        } catch (Exception $e) {
+            // Clean output buffer on error
+            $curObLevel = ob_get_level();
+            if ($curObLevel > $obLevel) {
+                do {
+                    ob_get_clean();
+                    $curObLevel = ob_get_level();
+                } while ($curObLevel > $obLevel);
+            }
+            throw $e;
+        }
+        if (empty($disableOb)) {
+            $content = ob_get_clean();
+            $response->appendBody($content);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Controller/ModuleActionController.php b/library/Icinga/Web/Controller/ModuleActionController.php
new file mode 100644
index 0000000..ad66264
--- /dev/null
+++ b/library/Icinga/Web/Controller/ModuleActionController.php
@@ -0,0 +1,80 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use Icinga\Application\Config;
+use Icinga\Application\Icinga;
+use Icinga\Application\Modules\Manager;
+use Icinga\Application\Modules\Module;
+
+/**
+ * Base class for module action controllers
+ */
+class ModuleActionController extends ActionController
+{
+    protected $config;
+
+    protected $configs = array();
+
+    protected $module;
+
+    /**
+     * (non-PHPDoc)
+     * @see \Icinga\Web\Controller\ActionController For the method documentation.
+     */
+    protected function prepareInit()
+    {
+        $this->moduleInit();
+        if (($this->Auth()->isAuthenticated() || $this->requiresLogin())
+            && $this->getFrontController()->getDefaultModule() !== $this->getModuleName()) {
+            $this->assertPermission(Manager::MODULE_PERMISSION_NS . $this->getModuleName());
+        }
+    }
+
+    /**
+     * Prepare module action controller initialization
+     */
+    protected function moduleInit()
+    {
+    }
+
+    public function Config($file = null)
+    {
+        if ($file === null) {
+            if ($this->config === null) {
+                $this->config = Config::module($this->getModuleName());
+            }
+            return $this->config;
+        } else {
+            if (! array_key_exists($file, $this->configs)) {
+                $this->configs[$file] = Config::module($this->getModuleName(), $file);
+            }
+            return $this->configs[$file];
+        }
+    }
+
+    /**
+     * Return this controller's module
+     *
+     * @return  Module
+     */
+    public function Module()
+    {
+        if ($this->module === null) {
+            $this->module = Icinga::app()->getModuleManager()->getModule($this->getModuleName());
+        }
+
+        return $this->module;
+    }
+
+    /**
+     * (non-PHPDoc)
+     * @see \Icinga\Web\Controller\ActionController::postDispatchXhr() For the method documentation.
+     */
+    public function postDispatchXhr()
+    {
+        parent::postDispatchXhr();
+        $this->getResponse()->setHeader('X-Icinga-Module', $this->getModuleName(), true);
+    }
+}
diff --git a/library/Icinga/Web/Controller/StaticController.php b/library/Icinga/Web/Controller/StaticController.php
new file mode 100644
index 0000000..f5ce163
--- /dev/null
+++ b/library/Icinga/Web/Controller/StaticController.php
@@ -0,0 +1,87 @@
+<?php
+/* Icinga Web 2 | (c) 2020 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Controller;
+
+use Icinga\Application\Icinga;
+use Icinga\Web\Request;
+
+class StaticController
+{
+    /**
+     * Handle incoming request
+     *
+     * @param Request $request
+     *
+     * @returns void
+     */
+    public function handle(Request $request)
+    {
+        $app = Icinga::app();
+
+        // +4 because strlen('/lib') === 4
+        $assetPath = ltrim(substr($request->getRequestUri(), strlen($request->getBaseUrl()) + 4), '/');
+
+        $library = null;
+        foreach ($app->getLibraries() as $candidate) {
+            if (substr($assetPath, 0, strlen($candidate->getName())) === $candidate->getName()) {
+                $library = $candidate;
+                $assetPath = ltrim(substr($assetPath, strlen($candidate->getName())), '/');
+                break;
+            }
+        }
+
+        if ($library === null) {
+            $app->getResponse()
+                ->setHttpResponseCode(404);
+
+            return;
+        }
+
+        $assetRoot = $library->getStaticAssetPath();
+        if (empty($assetRoot)) {
+            $app->getResponse()
+                ->setHttpResponseCode(404);
+
+            return;
+        }
+
+        $filePath = $assetRoot . DIRECTORY_SEPARATOR . $assetPath;
+        $dirPath = realpath(dirname($filePath)); // dirname, because the file may be a link
+
+        if ($dirPath === false
+            || substr($dirPath, 0, strlen($assetRoot)) !== $assetRoot
+            || ! is_file($filePath)
+        ) {
+            $app->getResponse()
+                ->setHttpResponseCode(404);
+
+            return;
+        }
+
+        $fileStat = stat($filePath);
+        $eTag = sprintf(
+            '%x-%x-%x',
+            $fileStat['ino'],
+            $fileStat['size'],
+            (float) str_pad($fileStat['mtime'], 16, '0')
+        );
+
+        $app->getResponse()->setHeader(
+            'Cache-Control',
+            'public, max-age=1814400, stale-while-revalidate=604800',
+            true
+        );
+
+        if ($request->getServer('HTTP_IF_NONE_MATCH') === $eTag) {
+            $app->getResponse()
+                ->setHttpResponseCode(304);
+        } else {
+            $app->getResponse()
+                ->setHeader('ETag', $eTag)
+                ->setHeader('Content-Type', mime_content_type($filePath), true)
+                ->setHeader('Last-Modified', gmdate('D, d M Y H:i:s', $fileStat['mtime']) . ' GMT')
+                ->setBody(file_get_contents($filePath));
+        }
+    }
+}
diff --git a/library/Icinga/Web/Cookie.php b/library/Icinga/Web/Cookie.php
new file mode 100644
index 0000000..283f07a
--- /dev/null
+++ b/library/Icinga/Web/Cookie.php
@@ -0,0 +1,299 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Config;
+use Icinga\Application\Icinga;
+use InvalidArgumentException;
+
+/**
+ * A HTTP cookie
+ */
+class Cookie
+{
+    /**
+     * Domain of the cookie
+     *
+     * @var string
+     */
+    protected $domain;
+
+    /**
+     * The timestamp at which the cookie expires
+     *
+     * @var int
+     */
+    protected $expire;
+
+    /**
+     * Whether to protect the cookie against client side script code attempts to read the cookie
+     *
+     * Defaults to true.
+     *
+     * @var bool
+     */
+    protected $httpOnly = true;
+
+    /**
+     * Name of the cookie
+     *
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * The path on the web server where the cookie is available
+     *
+     * Defaults to the base URL.
+     *
+     * @var string
+     */
+    protected $path;
+
+    /**
+     * Whether to send the cookie only over a secure connection
+     *
+     * Defaults to auto-detection so that if the current request was sent over a secure connection the secure flag will
+     * be set to true.
+     *
+     * @var bool
+     */
+    protected $secure;
+
+    /**
+     * Value of the cookie
+     *
+     * @var string
+     */
+    protected $value;
+
+    /**
+     * Create a new cookie
+     *
+     * @param   string  $name
+     * @param   string  $value
+     */
+    public function __construct($name, $value = null)
+    {
+        if (preg_match("/[=,; \t\r\n\013\014]/", $name)) {
+            throw new InvalidArgumentException(sprintf(
+                'Cookie name can\'t contain these characters: =,; \t\r\n\013\014 (%s)',
+                $name
+            ));
+        }
+        if (empty($name)) {
+            throw new InvalidArgumentException('The cookie name can\'t be empty');
+        }
+        $this->name = $name;
+        $this->value = $value;
+    }
+
+    /**
+     * Get the domain of the cookie
+     *
+     * @return  string
+     */
+    public function getDomain()
+    {
+        if ($this->domain === null) {
+            $this->domain = Config::app()->get('cookie', 'domain');
+        }
+        return $this->domain;
+    }
+
+    /**
+     * Set the domain of the cookie
+     *
+     * @param   string  $domain
+     *
+     * @return  $this
+     */
+    public function setDomain($domain)
+    {
+        $this->domain = $domain;
+        return $this;
+    }
+
+    /**
+     * Get the timestamp at which the cookie expires
+     *
+     * @return  int
+     */
+    public function getExpire()
+    {
+        return $this->expire;
+    }
+
+    /**
+     * Set the timestamp at which the cookie expires
+     *
+     * @param   int $expire
+     *
+     * @return  $this
+     */
+    public function setExpire($expire)
+    {
+        $this->expire = $expire;
+        return $this;
+    }
+
+    /**
+     * Get whether to protect the cookie against client side script code attempts to read the cookie
+     *
+     * @return  bool
+     */
+    public function isHttpOnly()
+    {
+        return $this->httpOnly;
+    }
+
+    /**
+     * Set whether to protect the cookie against client side script code attempts to read the cookie
+     *
+     * @param   bool    $httpOnly
+     *
+     * @return  $this
+     */
+    public function setHttpOnly($httpOnly)
+    {
+        $this->httpOnly = $httpOnly;
+        return $this;
+    }
+
+    /**
+     * Get the name of the cookie
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Get the path on the web server where the cookie is available
+     *
+     * If the path has not been set either via {@link setPath()} or via config, the base URL will be returned.
+     *
+     * @return  string
+     */
+    public function getPath()
+    {
+        if ($this->path === null) {
+            $path = Config::app()->get('cookie', 'path');
+            if ($path === null) {
+                // The following call could be used as default for ConfigObject::get(), but we prevent unnecessary
+                // function calls here, if the path is set in the config
+                $path = Icinga::app()->getRequest()->getBaseUrl() . '/'; // Zend has rtrim($baseUrl, '/')
+            }
+            $this->path = $path;
+        }
+        return $this->path;
+    }
+
+    /**
+     * Set the path on the web server where the cookie is available
+     *
+     * @param   string  $path
+     *
+     * @return  $this
+     */
+    public function setPath($path)
+    {
+        $this->path = $path;
+        return $this;
+    }
+
+    /**
+     * Get whether to send the cookie only over a secure connection
+     *
+     * If the secure flag has not been set either via {@link setSecure()} or via config and if the current request was
+     * sent over a secure connection, true will be returned.
+     *
+     * @return bool
+     */
+    public function isSecure()
+    {
+        if ($this->secure === null) {
+            $secure = Config::app()->get('cookie', 'secure');
+            if ($secure === null) {
+                // The following call could be used as default for ConfigObject::get(), but we prevent unnecessary
+                // function calls here, if the secure flag is set in the config
+                $secure = Icinga::app()->getRequest()->isSecure();
+            }
+            $this->secure = $secure;
+        }
+        return $this->secure;
+    }
+
+    /**
+     * Set whether to send the cookie only over a secure connection
+     *
+     * @param   bool    $secure
+     *
+     * @return  $this
+     */
+    public function setSecure($secure)
+    {
+        $this->secure = $secure;
+        return $this;
+    }
+
+    /**
+     * Get the value of the cookie
+     *
+     * @return  string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Set the value of the cookie
+     *
+     * @param   string  $value
+     *
+     * @return  $this
+     */
+    public function setValue($value)
+    {
+        $this->value = $value;
+        return $this;
+    }
+
+    /**
+     * Create invalidation cookie
+     *
+     * This method clones the current cookie and sets its value to null and expire time to 1.
+     * That way, the cookie removes itself when it has been sent to and processed by the client.
+     *
+     * We're cloning the current cookie in order to meet the [RFC6265 spec](https://tools.ietf.org/search/rfc6265)
+     * regarding the `Path` and `Domain` attribute:
+     *
+     * > Finally, to remove a cookie, the server returns a Set-Cookie header with an expiration date in the past.
+     * > The server will be successful in removing the cookie only if the Path and the Domain attribute in the
+     * > Set-Cookie header match the values used when the cookie was created.
+     *
+     * Note that the cookie has to be sent to the client.
+     *
+     * # Example Usage
+     *
+     * ```php
+     * $response->setCookie(
+     *     $cookie->forgetMe()
+     * );
+     * ```
+     *
+     * @return static
+     */
+    public function forgetMe()
+    {
+        $forgetMe = clone $this;
+
+        return $forgetMe
+            ->setValue(null)
+            ->setExpire(1);
+    }
+}
diff --git a/library/Icinga/Web/CookieSet.php b/library/Icinga/Web/CookieSet.php
new file mode 100644
index 0000000..019be29
--- /dev/null
+++ b/library/Icinga/Web/CookieSet.php
@@ -0,0 +1,58 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use ArrayIterator;
+use IteratorAggregate;
+use Traversable;
+
+/**
+ * Maintain a set of cookies
+ */
+class CookieSet implements IteratorAggregate
+{
+    /**
+     * Cookies in this set indexed by the cookie names
+     *
+     * @var Cookie[]
+     */
+    protected $cookies = array();
+
+    /**
+     * Get an iterator for traversing the cookies in this set
+     *
+     * @return  ArrayIterator   An iterator for traversing the cookies in this set
+     */
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->cookies);
+    }
+
+    /**
+     * Add a cookie to the set
+     *
+     * If a cookie with the same name already exists, the cookie will be overridden.
+     *
+     * @param   Cookie  $cookie The cookie to add
+     *
+     * @return  $this
+     */
+    public function add(Cookie $cookie)
+    {
+        $this->cookies[$cookie->getName()] = $cookie;
+        return $this;
+    }
+
+    /**
+     * Get the cookie with the given name from the set
+     *
+     * @param   string  $name       The name of the cookie
+     *
+     * @return  Cookie|null         The cookie with the given name or null if the cookie does not exist
+     */
+    public function get($name)
+    {
+        return isset($this->cookies[$name]) ? $this->cookies[$name] : null;
+    }
+}
diff --git a/library/Icinga/Web/Dom/DomNodeIterator.php b/library/Icinga/Web/Dom/DomNodeIterator.php
new file mode 100644
index 0000000..1ea20b8
--- /dev/null
+++ b/library/Icinga/Web/Dom/DomNodeIterator.php
@@ -0,0 +1,84 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Dom;
+
+use DOMNode;
+use IteratorIterator;
+use RecursiveIterator;
+
+/**
+ * Recursive iterator over a DOMNode
+ *
+ * Usage example:
+ * <code>
+ * <?php
+ *
+ * namespace Icinga\Example;
+ *
+ * use DOMDocument;
+ * use RecursiveIteratorIterator;
+ * use Icinga\Web\Dom\DomIterator;
+ *
+ * $doc = new DOMDocument();
+ * $doc->loadHTML(...);
+ * $dom = new RecursiveIteratorIterator(new DomNodeIterator($doc), RecursiveIteratorIterator::SELF_FIRST);
+ * foreach ($dom as $node) {
+ *     ....
+ * }
+ * </code>
+ */
+class DomNodeIterator implements RecursiveIterator
+{
+    /**
+     * The node's children
+     *
+     * @var IteratorIterator
+     */
+    protected $children;
+
+    /**
+     * Create a new iterator over a DOMNode's children
+     *
+     * @param DOMNode $node
+     */
+    public function __construct(DOMNode $node)
+    {
+        $this->children = new IteratorIterator($node->childNodes);
+    }
+
+    public function current(): ?DOMNode
+    {
+        return $this->children->current();
+    }
+
+    public function key(): int
+    {
+        return $this->children->key();
+    }
+
+    public function next(): void
+    {
+        $this->children->next();
+    }
+
+    public function rewind(): void
+    {
+        $this->children->rewind();
+    }
+
+    public function valid(): bool
+    {
+        return $this->children->valid();
+    }
+
+    public function hasChildren(): bool
+    {
+        return $this->current()->hasChildNodes();
+    }
+
+    public function getChildren(): DomNodeIterator
+    {
+        return new static($this->current());
+    }
+}
diff --git a/library/Icinga/Web/FileCache.php b/library/Icinga/Web/FileCache.php
new file mode 100644
index 0000000..03f0c19
--- /dev/null
+++ b/library/Icinga/Web/FileCache.php
@@ -0,0 +1,293 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+class FileCache
+{
+    /**
+     * FileCache singleton instances
+     *
+     * @var array
+     */
+    protected static $instances = array();
+
+    /**
+     * Cache instance base directory
+     *
+     * @var string
+     */
+    protected $basedir;
+
+    /**
+     * Instance name
+     *
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * Whether the cache is enabled
+     *
+     * @var bool
+     */
+    protected $enabled = false;
+
+    /**
+     * The protected constructor creates a new instance with the given name
+     *
+     * @param string $name Cache instance name
+     */
+    protected function __construct($name)
+    {
+        $this->name = $name;
+        $tmpDir = sys_get_temp_dir();
+        $runtimePath = $tmpDir . '/FileCache_' . $name;
+        if (is_dir($runtimePath)) {
+            // Don't combine the following if with the above because else the elseif path will be evaluated if the
+            // runtime path exists and is not writeable
+            if (is_writeable($runtimePath)) {
+                $this->basedir = $runtimePath;
+                $this->enabled = true;
+            }
+        } elseif (is_dir($tmpDir) && is_writeable($tmpDir) && @mkdir($runtimePath, octdec('1750'), true)) {
+            // Suppress mkdir errors because it may error w/ no such file directory if the systemd private tmp directory
+            // for the web server has been removed
+            $this->basedir = $runtimePath;
+            $this->enabled = true;
+        }
+    }
+
+    /**
+     * Store the given content to the desired file name
+     *
+     * @param string $file    new (relative) filename
+     * @param string $content the content to be stored
+     *
+     * @return bool whether the file has been stored
+     */
+    public function store($file, $content)
+    {
+        if (! $this->enabled) {
+            return false;
+        }
+
+        return file_put_contents($this->filename($file), $content);
+    }
+
+    /**
+     * Find out whether a given file exists
+     *
+     * @param string $file      the (relative) filename
+     * @param int    $newerThan optional timestamp to compare against
+     *
+     * @return bool whether such file exists
+     */
+    public function has($file, $newerThan = null)
+    {
+        if (! $this->enabled) {
+            return false;
+        }
+
+        $filename = $this->filename($file);
+
+        if (! file_exists($filename) || ! is_readable($filename)) {
+            return false;
+        }
+
+        if ($newerThan === null) {
+            return true;
+        }
+
+        $info = stat($filename);
+
+        if ($info === false) {
+            return false;
+        }
+
+        return (int) $newerThan < $info['mtime'];
+    }
+
+    /**
+     * Get a specific file or false if no such file available
+     *
+     * @param string $file the disired file name
+     *
+     * @return string|bool Filename content or false
+     */
+    public function get($file)
+    {
+        if ($this->has($file)) {
+            return file_get_contents($this->filename($file));
+        }
+
+        return false;
+    }
+
+    /**
+     * Send a specific file to the browser (output)
+     *
+     * @param string $file the disired file name
+     *
+     * @return bool Whether the file has been sent
+     */
+    public function send($file)
+    {
+        if ($this->has($file)) {
+            readfile($this->filename($file));
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Get absolute filename for a given file
+     *
+     * @param string $file the disired file name
+     *
+     * @return string absolute filename
+     */
+    protected function filename($file)
+    {
+        return $this->basedir . '/' . $file;
+    }
+
+    /**
+     * Prepare a sub directory with the given name and return its path
+     *
+     * @param   string  $name
+     *
+     * @return  string|false    Returns FALSE in case the cache is not enabled or an error occurred
+     */
+    public function directory($name)
+    {
+        if (! $this->enabled) {
+            return false;
+        }
+
+        $path = $this->filename($name);
+        if (! is_dir($path) && ! @mkdir($path, octdec('1750'), true)) {
+            return false;
+        }
+
+        return $path;
+    }
+
+    /**
+     * Whether the given ETag matches a cached file
+     *
+     * If no ETag is given we'll try to fetch the one from the current
+     * HTTP request.
+     *
+     * @param string $file  The cached file you want to check
+     * @param string $match The ETag to match against
+     *
+     * @return string|bool ETag on match, otherwise false
+     */
+    public function etagMatchesCachedFile($file, $match = null)
+    {
+        return self::etagMatchesFiles($this->filename($file), $match);
+    }
+
+    /**
+     * Create an ETag for the given file
+     *
+     * @param string $file The desired cache file
+     *
+     * @return string your ETag
+     */
+    public function etagForCachedFile($file)
+    {
+        return self::etagForFiles($this->filename($file));
+    }
+
+    /**
+     * Whether the given ETag matchesspecific file(s) on disk
+     *
+     * @param string|array $files file(s) to check
+     * @param string       $match ETag to match against
+     *
+     * @return string|bool ETag on match, otherwise false
+     */
+    public static function etagMatchesFiles($files, $match = null)
+    {
+        if ($match === null) {
+            $match = isset($_SERVER['HTTP_IF_NONE_MATCH'])
+                ? trim($_SERVER['HTTP_IF_NONE_MATCH'], '"')
+                : false;
+        }
+        if (! $match) {
+            return false;
+        }
+
+        if (preg_match('/([0-9a-f]{8}-[0-9a-f]{8}-[0-9a-f]{8})-\w+/i', $match, $matches)) {
+            // Removes compression suffixes as our custom algorithm can't handle compressed cache files anyway
+            $match = $matches[1];
+        }
+
+        $etag = self::etagForFiles($files);
+        return $match === $etag ? $etag : false;
+    }
+
+    /**
+     * Create ETag for the given files
+     *
+     * Custom algorithm creating an ETag based on filenames, mtimes
+     * and file sizes. Supports single files or a list of files. This
+     * way we are able to create ETags for virtual files depending on
+     * multiple source files (e.g. compressed JS, CSS).
+     *
+     * @param string|array $files Single file or a list of such
+     *
+     * @return string The generated ETag
+     */
+    public static function etagForFiles($files)
+    {
+        if (is_string($files)) {
+            $files = array($files);
+        }
+
+        $sizes  = array();
+        $mtimes = array();
+
+        foreach ($files as $file) {
+            $file = realpath($file);
+            if ($file !== false && $info = stat($file)) {
+                $mtimes[] = $info['mtime'];
+                $sizes[]  = $info['size'];
+            } else {
+                $mtimes[] = time();
+                $sizes[]  = 0;
+            }
+        }
+
+        return sprintf(
+            '%s-%s-%s',
+            hash('crc32', implode('|', $files)),
+            hash('crc32', implode('|', $sizes)),
+            hash('crc32', implode('|', $mtimes))
+        );
+    }
+
+    /**
+     * Factory creating your cache instance
+     *
+     * @param string $name Instance name
+     *
+     * @return FileCache
+     */
+    public static function instance($name = 'icingaweb')
+    {
+        if ($name !== 'icingaweb') {
+            $name = 'icingaweb/modules/' . $name;
+        }
+
+        if (!array_key_exists($name, self::$instances)) {
+            self::$instances[$name] = new static($name);
+        }
+
+        return self::$instances[$name];
+    }
+}
diff --git a/library/Icinga/Web/Form.php b/library/Icinga/Web/Form.php
new file mode 100644
index 0000000..b421849
--- /dev/null
+++ b/library/Icinga/Web/Form.php
@@ -0,0 +1,1666 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Web\Form\Element\DateTimePicker;
+use ipl\I18n\Translation;
+use Zend_Config;
+use Zend_Form;
+use Zend_Form_Element;
+use Zend_View_Interface;
+use Icinga\Application\Icinga;
+use Icinga\Authentication\Auth;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Security\SecurityException;
+use Icinga\Web\Form\ErrorLabeller;
+use Icinga\Web\Form\Decorator\Autosubmit;
+use Icinga\Web\Form\Element\CsrfCounterMeasure;
+
+/**
+ * Base class for forms providing CSRF protection, confirmation logic and auto submission
+ *
+ * @method \Zend_Form_Element[] getElements() {
+ *     {@inheritdoc}
+ *     @return \Zend_Form_Element[]
+ * }
+ */
+class Form extends Zend_Form
+{
+    use Translation {
+        translate as i18nTranslate;
+        translatePlural as i18nTranslatePlural;
+    }
+
+    /**
+     * The suffix to append to a field's hidden default field name
+     */
+    const DEFAULT_SUFFIX = '_default';
+
+    /**
+     * A form's default CSS classes
+     */
+    const DEFAULT_CLASSES = 'icinga-form icinga-controls';
+
+    /**
+     * Identifier for notifications of type error
+     */
+    const NOTIFICATION_ERROR = 0;
+
+    /**
+     * Identifier for notifications of type warning
+     */
+    const NOTIFICATION_WARNING = 1;
+
+    /**
+     * Identifier for notifications of type info
+     */
+    const NOTIFICATION_INFO = 2;
+
+    /**
+     * Whether this form has been created
+     *
+     * @var bool
+     */
+    protected $created = false;
+
+    /**
+     * This form's parent
+     *
+     * Gets automatically set upon calling addSubForm().
+     *
+     * @var Form
+     */
+    protected $_parent;
+
+    /**
+     * Whether the form is an API target
+     *
+     * When the form is an API target, the form evaluates as submitted if the request method equals the form method.
+     * That means, that the submit button and form identification are not taken into account. In addition, the CSRF
+     * counter measure will not be added to the form's elements.
+     *
+     * @var bool
+     */
+    protected $isApiTarget = false;
+
+    /**
+     * The request associated with this form
+     *
+     * @var Request
+     */
+    protected $request;
+
+    /**
+     * The callback to call instead of Form::onSuccess()
+     *
+     * @var callable
+     */
+    protected $onSuccess;
+
+    /**
+     * Label to use for the standard submit button
+     *
+     * @var string
+     */
+    protected $submitLabel;
+
+    /**
+     * Label to use for showing the user an activity indicator when submitting the form
+     *
+     * @var string
+     */
+    protected $progressLabel;
+
+    /**
+     * The url to redirect to upon success
+     *
+     * @var Url
+     */
+    protected $redirectUrl;
+
+    /**
+     * The view script to use when rendering this form
+     *
+     * @var string
+     */
+    protected $viewScript;
+
+    /**
+     * Whether this form should NOT add random generated "challenge" tokens that are associated with the user's current
+     * session in order to prevent Cross-Site Request Forgery (CSRF). It is the form's responsibility to verify the
+     * existence and correctness of this token
+     *
+     * @var bool
+     */
+    protected $tokenDisabled = false;
+
+    /**
+     * Name of the CSRF token element
+     *
+     * @var string
+     */
+    protected $tokenElementName = 'CSRFToken';
+
+    /**
+     * Whether this form should add a UID element being used to distinct different forms posting to the same action
+     *
+     * @var bool
+     */
+    protected $uidDisabled = false;
+
+    /**
+     * Name of the form identification element
+     *
+     * @var string
+     */
+    protected $uidElementName = 'formUID';
+
+    /**
+     * Whether the form should validate the sent data when being automatically submitted
+     *
+     * @var bool
+     */
+    protected $validatePartial = false;
+
+    /**
+     * Whether element ids will be protected against collisions by appending a request-specific unique identifier
+     *
+     * @var bool
+     */
+    protected $protectIds = true;
+
+    /**
+     * The cue that is appended to each element's label if it's required
+     *
+     * @var string
+     */
+    protected $requiredCue = '*';
+
+    /**
+     * The descriptions of this form
+     *
+     * @var array
+     */
+    protected $descriptions;
+
+    /**
+     * The notifications of this form
+     *
+     * @var array
+     */
+    protected $notifications;
+
+    /**
+     * The hints of this form
+     *
+     * @var array
+     */
+    protected $hints;
+
+    /**
+     * Whether the Autosubmit decorator should be applied to this form
+     *
+     * If this is true, the Autosubmit decorator is being applied to this form instead of to each of its elements.
+     *
+     * @var bool
+     */
+    protected $useFormAutosubmit = false;
+
+    /**
+     * Authentication manager
+     *
+     * @var Auth|null
+     */
+    private $auth;
+
+    /**
+     * Default element decorators
+     *
+     * @var array
+     */
+    public static $defaultElementDecorators = array(
+        array('Label', array('tag'=>'span', 'separator' => '', 'class' => 'control-label')),
+        array(array('labelWrap' => 'HtmlTag'), array('tag' => 'div', 'class' => 'control-label-group')),
+        array('ViewHelper', array('separator' => '')),
+        array('Help', array()),
+        array('Errors', array('separator' => '')),
+        array('HtmlTag', array('tag' => 'div', 'class' => 'control-group'))
+    );
+
+    /**
+     * (non-PHPDoc)
+     * @see \Zend_Form::construct() For the method documentation.
+     */
+    public function __construct($options = null)
+    {
+        // Zend's plugin loader reverses the order of added prefix paths thus trying our paths first before trying
+        // Zend paths
+        $this->addPrefixPaths(array(
+            array(
+                'prefix'    => 'Icinga\\Web\\Form\\Element\\',
+                'path'      => Icinga::app()->getLibraryDir('Icinga/Web/Form/Element'),
+                'type'      => static::ELEMENT
+            ),
+            array(
+                'prefix'    => 'Icinga\\Web\\Form\\Decorator\\',
+                'path'      => Icinga::app()->getLibraryDir('Icinga/Web/Form/Decorator'),
+                'type'      => static::DECORATOR
+            )
+        ));
+
+        if (! isset($options['attribs']['class'])) {
+            $options['attribs']['class'] = static::DEFAULT_CLASSES;
+        }
+
+        parent::__construct($options);
+    }
+
+    /**
+     * Set this form's parent
+     *
+     * @param   Form    $form
+     *
+     * @return  $this
+     */
+    public function setParent(Form $form)
+    {
+        $this->_parent = $form;
+        return $this;
+    }
+
+    /**
+     * Return this form's parent
+     *
+     * @return  Form
+     */
+    public function getParent()
+    {
+        return $this->_parent;
+    }
+
+    /**
+     * Set a callback that is called instead of this form's onSuccess method
+     *
+     * It is called using the following signature: (Form $this).
+     *
+     * @param   callable    $onSuccess  Callback
+     *
+     * @return  $this
+     *
+     * @throws  ProgrammingError        If the callback is not callable
+     */
+    public function setOnSuccess($onSuccess)
+    {
+        if (! is_callable($onSuccess)) {
+            throw new ProgrammingError('The option `onSuccess\' is not callable');
+        }
+        $this->onSuccess = $onSuccess;
+        return $this;
+    }
+
+    /**
+     * Set the label to use for the standard submit button
+     *
+     * @param   string  $label  The label to use for the submit button
+     *
+     * @return  $this
+     */
+    public function setSubmitLabel($label)
+    {
+        $this->submitLabel = $label;
+        return $this;
+    }
+
+    /**
+     * Return the label being used for the standard submit button
+     *
+     * @return  string
+     */
+    public function getSubmitLabel()
+    {
+        return $this->submitLabel;
+    }
+
+    /**
+     * Set the label to use for showing the user an activity indicator when submitting the form
+     *
+     * @param   string  $label
+     *
+     * @return  $this
+     */
+    public function setProgressLabel($label)
+    {
+        $this->progressLabel = $label;
+        return $this;
+    }
+
+    /**
+     * Return the label to use for showing the user an activity indicator when submitting the form
+     *
+     * @return  string
+     */
+    public function getProgressLabel()
+    {
+        return $this->progressLabel;
+    }
+
+    /**
+     * Set the url to redirect to upon success
+     *
+     * @param   string|Url  $url    The url to redirect to
+     *
+     * @return  $this
+     *
+     * @throws  ProgrammingError    In case $url is neither a string nor a instance of Icinga\Web\Url
+     */
+    public function setRedirectUrl($url)
+    {
+        if (is_string($url)) {
+            $url = Url::fromPath($url, array(), $this->getRequest());
+        } elseif (! $url instanceof Url) {
+            throw new ProgrammingError('$url must be a string or instance of Icinga\Web\Url');
+        }
+
+        $this->redirectUrl = $url;
+        return $this;
+    }
+
+    /**
+     * Return the url to redirect to upon success
+     *
+     * @return  Url
+     */
+    public function getRedirectUrl()
+    {
+        if ($this->redirectUrl === null) {
+            $this->redirectUrl = $this->getRequest()->getUrl();
+            if ($this->getMethod() === 'get') {
+                // Be sure to remove all form dependent params because we do not want to submit it again
+                $this->redirectUrl = $this->redirectUrl->without(array_keys($this->getElements()));
+            }
+        }
+
+        return $this->redirectUrl;
+    }
+
+    /**
+     * Set the view script to use when rendering this form
+     *
+     * @param   string  $viewScript     The view script to use
+     *
+     * @return  $this
+     */
+    public function setViewScript($viewScript)
+    {
+        $this->viewScript = $viewScript;
+        return $this;
+    }
+
+    /**
+     * Return the view script being used when rendering this form
+     *
+     * @return  string
+     */
+    public function getViewScript()
+    {
+        return $this->viewScript;
+    }
+
+    /**
+     * Disable CSRF counter measure and remove its field if already added
+     *
+     * @param   bool    $disabled   Set true in order to disable CSRF protection for this form, otherwise false
+     *
+     * @return  $this
+     */
+    public function setTokenDisabled($disabled = true)
+    {
+        $this->tokenDisabled = (bool) $disabled;
+
+        if ($disabled && $this->getElement($this->tokenElementName) !== null) {
+            $this->removeElement($this->tokenElementName);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether CSRF counter measures are disabled for this form
+     *
+     * @return  bool
+     */
+    public function getTokenDisabled()
+    {
+        return $this->tokenDisabled;
+    }
+
+    /**
+     * Set the name to use for the CSRF element
+     *
+     * @param   string  $name   The name to set
+     *
+     * @return  $this
+     */
+    public function setTokenElementName($name)
+    {
+        $this->tokenElementName = $name;
+        return $this;
+    }
+
+    /**
+     * Return the name of the CSRF element
+     *
+     * @return  string
+     */
+    public function getTokenElementName()
+    {
+        return $this->tokenElementName;
+    }
+
+    /**
+     * Disable form identification and remove its field if already added
+     *
+     * @param   bool    $disabled   Set true in order to disable identification for this form, otherwise false
+     *
+     * @return  $this
+     */
+    public function setUidDisabled($disabled = true)
+    {
+        $this->uidDisabled = (bool) $disabled;
+
+        if ($disabled && $this->getElement($this->uidElementName) !== null) {
+            $this->removeElement($this->uidElementName);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether identification is disabled for this form
+     *
+     * @return  bool
+     */
+    public function getUidDisabled()
+    {
+        return $this->uidDisabled;
+    }
+
+    /**
+     * Set the name to use for the form identification element
+     *
+     * @param   string  $name   The name to set
+     *
+     * @return  $this
+     */
+    public function setUidElementName($name)
+    {
+        $this->uidElementName = $name;
+        return $this;
+    }
+
+    /**
+     * Return the name of the form identification element
+     *
+     * @return  string
+     */
+    public function getUidElementName()
+    {
+        return $this->uidElementName;
+    }
+
+    /**
+     * Set whether this form should validate the sent data when being automatically submitted
+     *
+     * @param   bool    $state
+     *
+     * @return  $this
+     */
+    public function setValidatePartial($state)
+    {
+        $this->validatePartial = $state;
+        return $this;
+    }
+
+    /**
+     * Return whether this form should validate the sent data when being automatically submitted
+     *
+     * @return  bool
+     */
+    public function getValidatePartial()
+    {
+        return $this->validatePartial;
+    }
+
+    /**
+     * Set whether each element's id should be altered to avoid duplicates
+     *
+     * @param   bool    $value
+     *
+     * @return  Form
+     */
+    public function setProtectIds($value = true)
+    {
+        $this->protectIds = (bool) $value;
+        return $this;
+    }
+
+    /**
+     * Return whether each element's id is being altered to avoid duplicates
+     *
+     * @return  bool
+     */
+    public function getProtectIds()
+    {
+        return $this->protectIds;
+    }
+
+    /**
+     * Set the cue to append to each element's label if it's required
+     *
+     * @param   string  $cue
+     *
+     * @return  Form
+     */
+    public function setRequiredCue($cue)
+    {
+        $this->requiredCue = $cue;
+        return $this;
+    }
+
+    /**
+     * Return the cue being appended to each element's label if it's required
+     *
+     * @return  string
+     */
+    public function getRequiredCue()
+    {
+        return $this->requiredCue;
+    }
+
+    /**
+     * Set the descriptions for this form
+     *
+     * @param   array   $descriptions
+     *
+     * @return  Form
+     */
+    public function setDescriptions(array $descriptions)
+    {
+        $this->descriptions = $descriptions;
+        return $this;
+    }
+
+    /**
+     * Add a description for this form
+     *
+     * If $description is an array the second value should be
+     * an array as well containing additional HTML properties.
+     *
+     * @param   string|array    $description
+     *
+     * @return  Form
+     */
+    public function addDescription($description)
+    {
+        $this->descriptions[] = $description;
+        return $this;
+    }
+
+    /**
+     * Return the descriptions of this form
+     *
+     * @return  array
+     */
+    public function getDescriptions()
+    {
+        if ($this->descriptions === null) {
+            return array();
+        }
+
+        return $this->descriptions;
+    }
+
+    /**
+     * Set the notifications for this form
+     *
+     * @param   array   $notifications
+     *
+     * @return  $this
+     */
+    public function setNotifications(array $notifications)
+    {
+        $this->notifications = $notifications;
+        return $this;
+    }
+
+    /**
+     * Add a notification for this form
+     *
+     * If $notification is an array the second value should be
+     * an array as well containing additional HTML properties.
+     *
+     * @param   string|array    $notification
+     * @param   int             $type
+     *
+     * @return  $this
+     */
+    public function addNotification($notification, $type)
+    {
+        $this->notifications[$type][] = $notification;
+        return $this;
+    }
+
+    /**
+     * Return the notifications of this form
+     *
+     * @return  array
+     */
+    public function getNotifications()
+    {
+        if ($this->notifications === null) {
+            return array();
+        }
+
+        return $this->notifications;
+    }
+
+    /**
+     * Set the hints for this form
+     *
+     * @param   array   $hints
+     *
+     * @return  $this
+     */
+    public function setHints(array $hints)
+    {
+        $this->hints = $hints;
+        return $this;
+    }
+
+    /**
+     * Add a hint for this form
+     *
+     * If $hint is an array the second value should be an
+     * array as well containing additional HTML properties.
+     *
+     * @param   string|array    $hint
+     *
+     * @return  $this
+     */
+    public function addHint($hint)
+    {
+        $this->hints[] = $hint;
+        return $this;
+    }
+
+    /**
+     * Return the hints of this form
+     *
+     * @return  array
+     */
+    public function getHints()
+    {
+        if ($this->hints === null) {
+            return array();
+        }
+
+        return $this->hints;
+    }
+
+    /**
+     * Set whether the Autosubmit decorator should be applied to this form
+     *
+     * If true, the Autosubmit decorator is being applied to this form instead of to each of its elements.
+     *
+     * @param   bool    $state
+     *
+     * @return  Form
+     */
+    public function setUseFormAutosubmit($state = true)
+    {
+        $this->useFormAutosubmit = (bool) $state;
+        if ($this->useFormAutosubmit) {
+            $this->setAttrib('data-progress-element', 'header-' . $this->getId());
+        } else {
+            $this->removeAttrib('data-progress-element');
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether the Autosubmit decorator is being applied to this form
+     *
+     * @return  bool
+     */
+    public function getUseFormAutosubmit()
+    {
+        return $this->useFormAutosubmit;
+    }
+
+    /**
+     * Get whether the form is an API target
+     *
+     * @todo This should probably only return true if the request is also an api request
+     * @return bool
+     */
+    public function getIsApiTarget()
+    {
+        return $this->isApiTarget;
+    }
+
+    /**
+     * Set whether the form is an API target
+     *
+     * @param   bool $isApiTarget
+     *
+     * @return  $this
+     */
+    public function setIsApiTarget($isApiTarget = true)
+    {
+        $this->isApiTarget = (bool) $isApiTarget;
+        return $this;
+    }
+
+    /**
+     * Create this form
+     *
+     * @param   array   $formData   The data sent by the user
+     *
+     * @return  $this
+     */
+    public function create(array $formData = array())
+    {
+        if (! $this->created) {
+            $this->createElements($formData);
+            $this->addFormIdentification()
+                ->addCsrfCounterMeasure()
+                ->addSubmitButton();
+
+            // Use Form::getAttrib() instead of Form::getAction() here because we want to explicitly check against
+            // null. Form::getAction() would return the empty string '' if the action is not set.
+            // For not setting the action attribute use Form::setAction(''). This is required for for the
+            // accessibility's enable/disable auto-refresh mechanic
+            if ($this->getAttrib('action') === null) {
+                $action = $this->getRequest()->getUrl();
+                if ($this->getMethod() === 'get') {
+                    $action = $action->without(array_keys($this->getElements()));
+                }
+
+                // TODO(el): Re-evalute this necessity.
+                // JavaScript could use the container'sURL if there's no action set.
+                // We MUST set an action as JS gets confused otherwise, if
+                // this form is being displayed in an additional column
+                $this->setAction($action);
+            }
+
+            $this->created = true;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Create and add elements to this form
+     *
+     * Intended to be implemented by concrete form classes.
+     *
+     * @param   array   $formData   The data sent by the user
+     */
+    public function createElements(array $formData)
+    {
+    }
+
+    /**
+     * Perform actions after this form was submitted using a valid request
+     *
+     * Intended to be implemented by concrete form classes. The base implementation returns always FALSE.
+     *
+     * @return  null|bool               Return FALSE in case no redirect should take place
+     */
+    public function onSuccess()
+    {
+        return false;
+    }
+
+    /**
+     * Perform actions when no form dependent data was sent
+     *
+     * Intended to be implemented by concrete form classes.
+     */
+    public function onRequest()
+    {
+    }
+
+    /**
+     * Add a submit button to this form
+     *
+     * Uses the label previously set with Form::setSubmitLabel(). Overwrite this
+     * method in order to add multiple submit buttons or one with a custom name.
+     *
+     * @return  $this
+     */
+    public function addSubmitButton()
+    {
+        $submitLabel = $this->getSubmitLabel();
+        if ($submitLabel) {
+            $this->addElement(
+                'submit',
+                'btn_submit',
+                array(
+                    'class'                 => 'btn-primary',
+                    'ignore'                => true,
+                    'label'                 => $submitLabel,
+                    'data-progress-label'   => $this->getProgressLabel(),
+                    'decorators'            => array(
+                        'ViewHelper',
+                        array('Spinner', array('separator' => '')),
+                        array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                    )
+                )
+            );
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a subform
+     *
+     * @param   Zend_Form   $form   The subform to add
+     * @param   string      $name   The name of the subform or null to use the name of $form
+     * @param   int         $order  The location where to insert the form
+     *
+     * @return  Zend_Form
+     */
+    public function addSubForm(Zend_Form $form, $name = null, $order = null)
+    {
+        if ($form instanceof self) {
+            $form->setDecorators(array('FormElements')); // TODO: Makes it difficult to customise subform decorators..
+            $form->setSubmitLabel('');
+            $form->setTokenDisabled();
+            $form->setUidDisabled();
+            $form->setParent($this);
+        }
+
+        if ($name === null) {
+            $name = $form->getName();
+        }
+
+        return parent::addSubForm($form, $name, $order);
+    }
+
+    /**
+     * Create a new element
+     *
+     * Icinga Web 2 loads its own default element decorators. For loading Zend's default element decorators set the
+     * `disableLoadDefaultDecorators' option to any other value than `true'. For loading custom element decorators use
+     * the 'decorators' option.
+     *
+     * @param   string  $type       The type of the element
+     * @param   string  $name       The name of the element
+     * @param   mixed   $options    The options for the element
+     *
+     * @return  Zend_Form_Element
+     *
+     * @see     Form::$defaultElementDecorators For Icinga Web 2's default element decorators.
+     */
+    public function createElement($type, $name, $options = null)
+    {
+        if ($options !== null) {
+            if ($options instanceof Zend_Config) {
+                $options = $options->toArray();
+            }
+            if (! isset($options['decorators'])
+                && ! array_key_exists('disabledLoadDefaultDecorators', $options)
+            ) {
+                $options['decorators'] = static::$defaultElementDecorators;
+                if (! isset($options['data-progress-label']) && ($type === 'submit'
+                    || ($type === 'button' && isset($options['type']) && $options['type'] === 'submit'))
+                ) {
+                    array_splice($options['decorators'], 1, 0, array(array('Spinner', array('separator' => ''))));
+                } elseif ($type === 'hidden') {
+                    $options['decorators'] = array('ViewHelper');
+                }
+            }
+        } else {
+            $options = array('decorators' => static::$defaultElementDecorators);
+            if ($type === 'submit') {
+                array_splice($options['decorators'], 1, 0, array(array('Spinner', array('separator' => ''))));
+            } elseif ($type === 'hidden') {
+                $options['decorators'] = array('ViewHelper');
+            }
+        }
+
+        $el = parent::createElement($type, $name, $options);
+        $el->setTranslator(new ErrorLabeller(array('element' => $el)));
+
+        $el->addPrefixPaths(array(
+            array(
+                'prefix'    => 'Icinga\\Web\\Form\\Validator\\',
+                'path'      => Icinga::app()->getLibraryDir('Icinga/Web/Form/Validator'),
+                'type'      => $el::VALIDATE
+            )
+        ));
+
+        if ($this->protectIds) {
+            $el->setAttrib('id', $this->getRequest()->protectId($this->getId(false) . '_' . $el->getId()));
+        }
+
+        if ($el->getAttrib('autosubmit')) {
+            if ($this->getUseFormAutosubmit()) {
+                $warningId = 'autosubmit_warning_' . $el->getId();
+                $warningText = $this->getView()->escape($this->translate(
+                    'This page will be automatically updated upon change of the value'
+                ));
+                $autosubmitDecorator = $this->_getDecorator('Callback', array(
+                    'placement' => 'PREPEND',
+                    'callback'  => function ($content) use ($warningId, $warningText) {
+                        return '<span class="sr-only" id="' . $warningId . '">' . $warningText . '</span>';
+                    }
+                ));
+            } else {
+                $autosubmitDecorator = new Autosubmit();
+                $autosubmitDecorator->setAccessible();
+                $warningId = $autosubmitDecorator->getWarningId($el);
+            }
+
+            $decorators = $el->getDecorators();
+            $pos = array_search('Zend_Form_Decorator_ViewHelper', array_keys($decorators), true) + 1;
+            $el->setDecorators(
+                array_slice($decorators, 0, $pos, true)
+                + array('autosubmit' => $autosubmitDecorator)
+                + array_slice($decorators, $pos, count($decorators) - $pos, true)
+            );
+
+            if (($describedBy = $el->getAttrib('aria-describedby')) !== null) {
+                $el->setAttrib('aria-describedby', $describedBy . ' ' . $warningId);
+            } else {
+                $el->setAttrib('aria-describedby', $warningId);
+            }
+
+            $class = $el->getAttrib('class');
+            if (is_array($class)) {
+                $class[] = 'autosubmit';
+            } elseif ($class === null) {
+                $class = 'autosubmit';
+            } else {
+                $class .= ' autosubmit';
+            }
+            $el->setAttrib('class', $class);
+
+            unset($el->autosubmit);
+        }
+
+        if ($el->getAttrib('preserveDefault')) {
+            $el->addDecorator(
+                array('preserveDefault' => 'HtmlTag'),
+                array(
+                    'tag'   => 'input',
+                    'type'  => 'hidden',
+                    'name'  => $name . static::DEFAULT_SUFFIX,
+                    'value' => $el instanceof DateTimePicker
+                        ? $el->getValue()->format($el->getFormat())
+                        : $el->getValue()
+                )
+            );
+
+            unset($el->preserveDefault);
+        }
+
+        return $this->ensureElementAccessibility($el);
+    }
+
+    /**
+     * Add accessibility related attributes
+     *
+     * @param   Zend_Form_Element   $element
+     *
+     * @return  Zend_Form_Element
+     */
+    public function ensureElementAccessibility(Zend_Form_Element $element)
+    {
+        if ($element->isRequired()) {
+            $element->setAttrib('aria-required', 'true'); // ARIA
+            $element->setAttrib('required', ''); // HTML5
+            if (($cue = $this->getRequiredCue()) !== null && ($label = $element->getDecorator('label')) !== false) {
+                $element->setLabel($this->getView()->escape($element->getLabel()));
+                $label->setOption('escape', false);
+                $label->setRequiredSuffix(sprintf(' <span aria-hidden="true">%s</span>', $cue));
+            }
+        }
+
+        if ($element->getDescription() !== null && ($help = $element->getDecorator('help')) !== false) {
+            if (($describedBy = $element->getAttrib('aria-describedby')) !== null) {
+                // Assume that it's because of the element being of type autosubmit or
+                // that one who did set the property manually removes the help decorator
+                // in case it has already an aria-describedby property set
+                $element->setAttrib(
+                    'aria-describedby',
+                    $help->setAccessible()->getDescriptionId($element) . ' ' . $describedBy
+                );
+            } else {
+                $element->setAttrib('aria-describedby', $help->setAccessible()->getDescriptionId($element));
+            }
+        }
+
+        return $element;
+    }
+
+    /**
+     * Add a field with a unique and form specific ID
+     *
+     * @return  $this
+     */
+    public function addFormIdentification()
+    {
+        if (! $this->uidDisabled && $this->getElement($this->uidElementName) === null) {
+            $this->addElement(
+                'hidden',
+                $this->uidElementName,
+                array(
+                    'ignore'        => true,
+                    'value'         => $this->getName(),
+                    'decorators'    => array('ViewHelper')
+                )
+            );
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add CSRF counter measure field to this form
+     *
+     * @return  $this
+     */
+    public function addCsrfCounterMeasure()
+    {
+        if (! $this->tokenDisabled) {
+            $request = $this->getRequest();
+            if (! $request->isXmlHttpRequest()
+                && ($this->getIsApiTarget() || $request->isApiRequest())
+            ) {
+                return $this;
+            }
+            if ($this->getElement($this->tokenElementName) === null) {
+                $this->addElement('CsrfCounterMeasure', $this->tokenElementName);
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * Creates the form if not created yet.
+     *
+     * @param   array   $values
+     *
+     * @return  $this
+     */
+    public function setDefaults(array $values)
+    {
+        $this->create($values);
+        return parent::setDefaults($values);
+    }
+
+    /**
+     * Populate the elements with the given values
+     *
+     * @param   array   $defaults   The values to populate the elements with
+     *
+     * @return  $this
+     */
+    public function populate(array $defaults)
+    {
+        $this->create($defaults);
+        $this->preserveDefaults($this, $defaults);
+        return parent::populate($defaults);
+    }
+
+    /**
+     * Recurse the given form and unset all unchanged default values
+     *
+     * @param   Zend_Form   $form
+     * @param   array       $defaults
+     */
+    protected function preserveDefaults(Zend_Form $form, array &$defaults)
+    {
+        foreach ($form->getElements() as $name => $element) {
+            if ((array_key_exists($name, $defaults)
+                    && array_key_exists($name . static::DEFAULT_SUFFIX, $defaults)
+                    && $defaults[$name] === $defaults[$name . static::DEFAULT_SUFFIX])
+                || $element->getAttrib('disabled')
+            ) {
+                unset($defaults[$name]);
+            }
+        }
+
+        foreach ($form->getSubForms() as $_ => $subForm) {
+            $this->preserveDefaults($subForm, $defaults);
+        }
+    }
+
+    /**
+     * Process the given request using this form
+     *
+     * Redirects to the url set with setRedirectUrl() upon success. See onSuccess()
+     * and onRequest() wherewith you can customize the processing logic.
+     *
+     * @param   Request     $request    The request to be processed
+     *
+     * @return  Request                 The request supposed to be processed
+     */
+    public function handleRequest(Request $request = null)
+    {
+        if ($request === null) {
+            $request = $this->getRequest();
+        } else {
+            $this->request = $request;
+        }
+
+        $formData = $this->getRequestData();
+        if ($this->getIsApiTarget()
+            // TODO: Very very bad, wasSent() must not be bypassed if it's only an api request but not an qpi target
+            || $this->getRequest()->isApiRequest()
+            || $this->getUidDisabled()
+            || $this->wasSent($formData)
+        ) {
+            $this->populate($formData); // Necessary to get isSubmitted() to work
+            if (! $this->getSubmitLabel() || $this->isSubmitted()) {
+                if ($this->isValid($formData)
+                    && (($this->onSuccess !== null && false !== call_user_func($this->onSuccess, $this))
+                        || ($this->onSuccess === null && false !== $this->onSuccess()))
+                ) {
+                    // TODO: Still bad. An api target must not behave as one if it's not an api request
+                    if ($this->getIsApiTarget() || $this->getRequest()->isApiRequest()) {
+                        // API targets and API requests will never redirect but immediately respond w/ JSON-encoded
+                        // notifications
+                        $notifications = Notification::getInstance()->popMessages();
+                        $message = null;
+                        foreach ($notifications as $notification) {
+                            if ($notification->type === Notification::SUCCESS) {
+                                $message = $notification->message;
+                                break;
+                            }
+                        }
+                        $this->getResponse()->json()
+                            ->setSuccessData($message !== null ? array('message' => $message) : null)
+                            ->sendResponse();
+                    } else {
+                        $this->getResponse()->redirectAndExit($this->getRedirectUrl());
+                    }
+                // TODO: Still bad. An api target must not behave as one if it's not an api request
+                } elseif ($this->getIsApiTarget() || $this->getRequest()->isApiRequest()) {
+                    $this->getResponse()->json()->setFailData($this->getMessages())->sendResponse();
+                }
+            } elseif ($this->getValidatePartial()) {
+                // The form can't be processed but we may want to show validation errors though
+                $this->isValidPartial($formData);
+            }
+        } else {
+            $this->onRequest();
+        }
+
+        return $request;
+    }
+
+    /**
+     * Return whether the submit button of this form was pressed
+     *
+     * When overwriting Form::addSubmitButton() be sure to overwrite this method as well.
+     *
+     * @return  bool                True in case it was pressed, False otherwise or no submit label was set
+     */
+    public function isSubmitted()
+    {
+        $requestMethod = $this->getRequest()->getMethod();
+        if (strtolower($requestMethod ?: '') !== $this->getMethod()) {
+            return false;
+        }
+        if ($this->getIsApiTarget() || $this->getRequest()->isApiRequest()) {
+            return true;
+        }
+        if ($this->getSubmitLabel()) {
+            return $this->getElement('btn_submit')->isChecked();
+        }
+
+        return false;
+    }
+
+    /**
+     * Return whether the data sent by the user refers to this form
+     *
+     * Ensures that the correct form gets processed in case there are multiple forms
+     * with equal submit button names being posted against the same route.
+     *
+     * @param   array   $formData   The data sent by the user
+     *
+     * @return  bool                Whether the given data refers to this form
+     */
+    public function wasSent(array $formData)
+    {
+        return isset($formData[$this->uidElementName]) && $formData[$this->uidElementName] === $this->getName();
+    }
+
+    /**
+     * Return whether the given values (possibly incomplete) are valid
+     *
+     * Unlike Zend_Form::isValid() this will not set NULL as value for
+     * an element that is not present in the given data.
+     *
+     * @param   array   $formData   The data to validate
+     *
+     * @return  bool
+     */
+    public function isValidPartial(array $formData)
+    {
+        $this->create($formData);
+
+        foreach ($this->getElements() as $name => $element) {
+            if (array_key_exists($name, $formData)) {
+                if ($element->getAttrib('disabled')) {
+                    // Ensure that disabled elements are not overwritten
+                    // (http://www.zendframework.com/issues/browse/ZF-6909)
+                    $formData[$name] = $element->getValue();
+                } elseif (array_key_exists($name . static::DEFAULT_SUFFIX, $formData)
+                    && $formData[$name] === $formData[$name . static::DEFAULT_SUFFIX]
+                ) {
+                    unset($formData[$name]);
+                }
+            }
+        }
+
+        return parent::isValidPartial($formData);
+    }
+
+    /**
+     * Return whether the given values are valid
+     *
+     * @param   array   $formData   The data to validate
+     *
+     * @return  bool
+     */
+    public function isValid($formData)
+    {
+        $this->create($formData);
+
+        // Ensure that disabled elements are not overwritten (http://www.zendframework.com/issues/browse/ZF-6909)
+        foreach ($this->getElements() as $name => $element) {
+            if ($element->getAttrib('disabled')) {
+                $formData[$name] = $element->getValue();
+            }
+        }
+
+        return parent::isValid($formData);
+    }
+
+    /**
+     * Remove all elements of this form
+     *
+     * @return  self
+     */
+    public function clearElements()
+    {
+        $this->created = false;
+        return parent::clearElements();
+    }
+
+    /**
+     * Load the default decorators
+     *
+     * Overwrites Zend_Form::loadDefaultDecorators to avoid having
+     * the HtmlTag-Decorator added and to provide view script usage
+     *
+     * @return  $this
+     */
+    public function loadDefaultDecorators()
+    {
+        if ($this->loadDefaultDecoratorsIsDisabled()) {
+            return $this;
+        }
+
+        $decorators = $this->getDecorators();
+        if (empty($decorators)) {
+            if ($this->viewScript) {
+                $this->addDecorator('ViewScript', array(
+                    'viewScript'    => $this->viewScript,
+                    'form'          => $this
+                ));
+            } else {
+                $this->addDecorator('Description', array('tag' => 'h1'));
+                if ($this->getUseFormAutosubmit()) {
+                    $this->getDecorator('Description')->setEscape(false);
+                    $this->addDecorator(
+                        'HtmlTag',
+                        array(
+                            'tag'   => 'div',
+                            'class' => 'header',
+                            'id'    => 'header-' . $this->getId()
+                        )
+                    );
+                }
+
+                $this->addDecorator('FormDescriptions')
+                    ->addDecorator('FormNotifications')
+                    ->addDecorator('FormErrors', array('onlyCustomFormErrors' => true))
+                    ->addDecorator('FormElements')
+                    ->addDecorator('FormHints')
+                    //->addDecorator('HtmlTag', array('tag' => 'dl', 'class' => 'zend_form'))
+                    ->addDecorator('Form');
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get element id
+     *
+     * Returns the protected id, in case id protection is enabled.
+     *
+     * @param   bool    $protect
+     *
+     * @return  string
+     */
+    public function getId($protect = true)
+    {
+        $id = parent::getId();
+        return $protect && $this->protectIds ? $this->getRequest()->protectId($id) : $id;
+    }
+
+    /**
+     * Return the name of this form
+     *
+     * @return  string
+     */
+    public function getName()
+    {
+        $name = parent::getName();
+        if (! $name) {
+            $name = get_class($this);
+            $this->setName($name);
+            $name = parent::getName();
+        }
+        return $name;
+    }
+
+    /**
+     * Retrieve form description
+     *
+     * This will return the escaped description with the autosubmit warning icon if form autosubmit is enabled.
+     *
+     * @return  string
+     */
+    public function getDescription()
+    {
+        $description = parent::getDescription();
+        if ($description && $this->getUseFormAutosubmit()) {
+            $autosubmit = $this->_getDecorator('Autosubmit', array('accessible' => true));
+            $autosubmit->setElement($this);
+            $description = $autosubmit->render($this->getView()->escape($description));
+        }
+
+        return $description;
+    }
+
+    /**
+     * Set the action to submit this form against
+     *
+     * Note that if you'll pass a instance of URL, Url::getAbsoluteUrl('&') is called to set the action.
+     *
+     * @param   Url|string  $action
+     *
+     * @return  $this
+     */
+    public function setAction($action)
+    {
+        if ($action instanceof Url) {
+            $action = $action->getAbsoluteUrl('&');
+        }
+
+        return parent::setAction($action);
+    }
+
+    /**
+     * Set form description
+     *
+     * Alias for Zend_Form::setDescription().
+     *
+     * @param   string  $value
+     *
+     * @return  Form
+     */
+    public function setTitle($value)
+    {
+        return $this->setDescription($value);
+    }
+
+    /**
+     * Return the request associated with this form
+     *
+     * Returns the global request if none has been set for this form yet.
+     *
+     * @return  Request
+     */
+    public function getRequest()
+    {
+        if ($this->request === null) {
+            $this->request = Icinga::app()->getRequest();
+        }
+
+        return $this->request;
+    }
+
+    /**
+     * Set the request
+     *
+     * @param   Request $request
+     *
+     * @return  $this
+     */
+    public function setRequest(Request $request)
+    {
+        $this->request = $request;
+        return $this;
+    }
+
+    /**
+     * Return the current Response
+     *
+     * @return  Response
+     */
+    public function getResponse()
+    {
+        return Icinga::app()->getFrontController()->getResponse();
+    }
+
+    /**
+     * Return the request data based on this form's request method
+     *
+     * @return  array
+     */
+    protected function getRequestData()
+    {
+        $requestMethod = $this->getRequest()->getMethod();
+        if (strtolower($requestMethod ?: '') === $this->getMethod()) {
+            return $this->request->{'get' . ($this->request->isPost() ? 'Post' : 'Query')}();
+        }
+
+        return array();
+    }
+
+    /**
+     * Get the translation domain for this form
+     *
+     * The returned translation domain is either determined based on this form's qualified name or it is the default
+     * 'icinga' domain
+     *
+     * @return string
+     */
+    protected function getTranslationDomain()
+    {
+        $parts = explode('\\', get_called_class());
+        if (count($parts) > 1 && $parts[1] === 'Module') {
+            // Assume format Icinga\Module\ModuleName\Forms\...
+            return strtolower($parts[2]);
+        }
+
+        return 'icinga';
+    }
+
+    /**
+     * Translate a string
+     *
+     * @param   string      $text       The string to translate
+     * @param   string|null $context    Optional parameter for context based translation
+     *
+     * @return  string                  The translated string
+     */
+    protected function translate($text, $context = null)
+    {
+        $this->translationDomain = $this->getTranslationDomain();
+
+        return $this->i18nTranslate($text, $context);
+    }
+
+    /**
+     * Translate a plural string
+     *
+     * @param   string      $textSingular   The string in singular form to translate
+     * @param   string      $textPlural     The string in plural form to translate
+     * @param   integer     $number         The amount to determine from whether to return singular or plural
+     * @param   string|null $context        Optional parameter for context based translation
+     *
+     * @return  string                      The translated string
+     */
+    protected function translatePlural($textSingular, $textPlural, $number, $context = null)
+    {
+        $this->translationDomain = $this->getTranslationDomain();
+
+        return $this->i18nTranslatePlural($textSingular, $textPlural, $number, $context);
+    }
+
+    /**
+     * Render this form
+     *
+     * @param   Zend_View_Interface     $view   The view context to use
+     *
+     * @return  string
+     */
+    public function render(Zend_View_Interface $view = null)
+    {
+        $this->create();
+        return parent::render($view);
+    }
+
+    /**
+     * Get the authentication manager
+     *
+     * @return Auth
+     */
+    public function Auth()
+    {
+        if ($this->auth === null) {
+            $this->auth = Auth::getInstance();
+        }
+        return $this->auth;
+    }
+
+    /**
+     * Whether the current user has the given permission
+     *
+     * @param   string  $permission Name of the permission
+     *
+     * @return  bool
+     */
+    public function hasPermission($permission)
+    {
+        return $this->Auth()->hasPermission($permission);
+    }
+
+    /**
+     * Assert that the current user has the given permission
+     *
+     * @param   string  $permission     Name of the permission
+     *
+     * @throws  SecurityException       If the current user lacks the given permission
+     */
+    public function assertPermission($permission)
+    {
+        if (! $this->Auth()->hasPermission($permission)) {
+            throw new SecurityException('No permission for %s', $permission);
+        }
+    }
+
+    /**
+     * Add a error notification
+     *
+     * @param   string|array    $message        The notification message
+     * @param   bool            $markAsError    Whether to prevent the form from being successfully validated or not
+     *
+     * @return  $this
+     */
+    public function error($message, $markAsError = true)
+    {
+        if ($this->getIsApiTarget()) {
+            $this->addErrorMessage($message);
+        } else {
+            $this->addNotification($message, self::NOTIFICATION_ERROR);
+        }
+
+        if ($markAsError) {
+            $this->markAsError();
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a warning notification
+     *
+     * @param   string|array    $message        The notification message
+     * @param   bool            $markAsError    Whether to prevent the form from being successfully validated or not
+     *
+     * @return  $this
+     */
+    public function warning($message, $markAsError = true)
+    {
+        if ($this->getIsApiTarget()) {
+            $this->addErrorMessage($message);
+        } else {
+            $this->addNotification($message, self::NOTIFICATION_WARNING);
+        }
+
+        if ($markAsError) {
+            $this->markAsError();
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a info notification
+     *
+     * @param   string|array    $message        The notification message
+     * @param   bool            $markAsError    Whether to prevent the form from being successfully validated or not
+     *
+     * @return  $this
+     */
+    public function info($message, $markAsError = true)
+    {
+        if ($this->getIsApiTarget()) {
+            $this->addErrorMessage($message);
+        } else {
+            $this->addNotification($message, self::NOTIFICATION_INFO);
+        }
+
+        if ($markAsError) {
+            $this->markAsError();
+        }
+
+        return $this;
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/Autosubmit.php b/library/Icinga/Web/Form/Decorator/Autosubmit.php
new file mode 100644
index 0000000..4405d0b
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/Autosubmit.php
@@ -0,0 +1,133 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Decorator_Abstract;
+use Icinga\Application\Icinga;
+use Icinga\Web\View;
+use Icinga\Web\Form;
+
+/**
+ * Decorator to add an icon and a submit button encapsulated in noscript-tags
+ *
+ * The icon is shown in JS environments to indicate that a specific form field does automatically request an update
+ * of its form upon it has changed. The button allows users in non-JS environments to trigger the update manually.
+ */
+class Autosubmit extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Whether a hidden <span> should be created with the same warning as in the icon label
+     *
+     * @var bool
+     */
+    protected $accessible;
+
+    /**
+     * The id used to identify the auto-submit warning associated with the decorated form element
+     *
+     * @var string
+     */
+    protected $warningId;
+
+    /**
+     * Set whether a hidden <span> should be created with the same warning as in the icon label
+     *
+     * @param   bool    $state
+     *
+     * @return  Autosubmit
+     */
+    public function setAccessible($state = true)
+    {
+        $this->accessible = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return whether a hidden <span> is being created with the same warning as in the icon label
+     *
+     * @return  bool
+     */
+    public function getAccessible()
+    {
+        if ($this->accessible === null) {
+            $this->accessible = $this->getOption('accessible') ?: false;
+        }
+
+        return $this->accessible;
+    }
+
+    /**
+     * Return the id used to identify the auto-submit warning associated with the decorated element
+     *
+     * @param   mixed   $element    The element for which to generate a id
+     *
+     * @return  string
+     */
+    public function getWarningId($element = null)
+    {
+        if ($this->warningId === null) {
+            $element = $element ?: $this->getElement();
+            $this->warningId = 'autosubmit_warning_' . $element->getId();
+        }
+
+        return $this->warningId;
+    }
+
+    /**
+     * Return the current view
+     *
+     * @return  View
+     */
+    protected function getView()
+    {
+        return Icinga::app()->getViewRenderer()->view;
+    }
+
+    /**
+     * Add a auto-submit icon and submit button encapsulated in noscript-tags to the element
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  string                  The updated html
+     */
+    public function render($content = '')
+    {
+        if ($content) {
+            $isForm = $this->getElement() instanceof Form;
+            $warning = $isForm
+                ? t('This page will be automatically updated upon change of any of this form\'s fields')
+                : t('This page will be automatically updated upon change of the value');
+            $content .= $this->getView()->icon('cw', $warning, array(
+                'aria-hidden'   => $isForm ? 'false' : 'true',
+                'class'         => 'spinner autosubmit-info'
+            ));
+            if (! $isForm && $this->getAccessible()) {
+                $content = '<span id="'
+                    . $this->getWarningId()
+                    . '" class="sr-only">'
+                    . $warning
+                    . '</span>'
+                    . $content;
+            }
+
+            $content .= sprintf(
+                '<noscript><button'
+                . ' name="noscript_apply"'
+                . ' class="noscript-apply"'
+                . ' type="submit"'
+                . ' value="1"'
+                . ($this->getAccessible() ? ' aria-label="%1$s"' : '')
+                . ' title="%1$s"'
+                . '>%2$s</button></noscript>',
+                $isForm
+                    ? t('Push this button to update the form to reflect the changes that were made below')
+                    : t('Push this button to update the form to reflect the change'
+                        . ' that was made in the field on the left'),
+                $this->getView()->icon('cw') . t('Apply')
+            );
+        }
+
+        return $content;
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/ConditionalHidden.php b/library/Icinga/Web/Form/Decorator/ConditionalHidden.php
new file mode 100644
index 0000000..0f84535
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/ConditionalHidden.php
@@ -0,0 +1,35 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Decorator_Abstract;
+
+/**
+ * Decorator to hide elements using a &gt;noscript&lt; tag instead of
+ * type='hidden' or css styles.
+ *
+ * This allows to hide depending elements for browsers with javascript
+ * (who can then automatically refresh their pages) but show them in
+ * case JavaScript is disabled
+ */
+class ConditionalHidden extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Generate a field that will be wrapped in <noscript> tag if the
+     * "condition" attribute is set and false or 0
+     *
+     * @param   string $content The tag's content
+     *
+     * @return  string The generated tag
+     */
+    public function render($content = '')
+    {
+        $attributes = $this->getElement()->getAttribs();
+        $condition = isset($attributes['condition']) ? $attributes['condition'] : 1;
+        if ($condition != 1) {
+            $content = '<noscript>' . $content . '</noscript>';
+        }
+        return $content;
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/ElementDoubler.php b/library/Icinga/Web/Form/Decorator/ElementDoubler.php
new file mode 100644
index 0000000..2da5646
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/ElementDoubler.php
@@ -0,0 +1,63 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Element;
+use Zend_Form_Decorator_Abstract;
+
+/**
+ * A decorator that will double a single element of a display group
+ *
+ * The options `condition', `double' and `attributes' can be passed to the constructor and are used to affect whether
+ * the doubling should take effect, which element should be doubled and which HTML attributes should be applied to the
+ * doubled element, respectively.
+ *
+ * `condition' must be an element's name that when it's part of the display group causes the condition to be met.
+ * `double' must be an element's name and must be part of the display group.
+ * `attributes' is just an array of key-value pairs.
+ *
+ * You can also pass `placement' to control whether the doubled element is prepended or appended.
+ */
+class ElementDoubler extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Return the display group's elements with an additional copy of an element being added if the condition is met
+     *
+     * @param   string  $content    The HTML rendered so far
+     *
+     * @return  string
+     */
+    public function render($content)
+    {
+        $group = $this->getElement();
+        if ($group->getElement($this->getOption('condition')) !== null) {
+            if ($this->getPlacement() === static::APPEND) {
+                return $content . $this->applyAttributes($group->getElement($this->getOption('double')))->render();
+            } else { // $this->getPlacement() === static::PREPEND
+                return $this->applyAttributes($group->getElement($this->getOption('double')))->render() . $content;
+            }
+        }
+
+        return $content;
+    }
+
+    /**
+     * Apply all element attributes
+     *
+     * @param   Zend_Form_Element   $element    The element to apply the attributes to
+     *
+     * @return  Zend_Form_Element
+     */
+    protected function applyAttributes(Zend_Form_Element $element)
+    {
+        $attributes = $this->getOption('attributes');
+        if ($attributes !== null) {
+            foreach ($attributes as $name => $value) {
+                $element->setAttrib($name, $value);
+            }
+        }
+
+        return $element;
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/FormDescriptions.php b/library/Icinga/Web/Form/Decorator/FormDescriptions.php
new file mode 100644
index 0000000..5bd5f6a
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/FormDescriptions.php
@@ -0,0 +1,76 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Icinga\Application\Icinga;
+use Icinga\Web\Form;
+use Zend_Form_Decorator_Abstract;
+
+/**
+ * Decorator to add a list of descriptions at the top or bottom of a form
+ */
+class FormDescriptions extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Render form descriptions
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  ?string                  The updated html
+     */
+    public function render($content = '')
+    {
+        $form = $this->getElement();
+        if (! $form instanceof Form) {
+            return $content;
+        }
+
+        $view = $form->getView();
+        if ($view === null) {
+            return $content;
+        }
+
+        $descriptions = $this->recurseForm($form);
+        if (empty($descriptions)) {
+            return $content;
+        }
+
+        $html = '<div class="form-description">'
+            . Icinga::app()->getViewRenderer()->view->icon('info-circled', '', ['class' => 'form-description-icon'])
+            . '<ul class="form-description-list">';
+
+        foreach ($descriptions as $description) {
+            if (is_array($description)) {
+                list($description, $properties) = $description;
+                $html .= '<li' . $view->propertiesToString($properties) . '>' . $view->escape($description) . '</li>';
+            } else {
+                $html .= '<li>' . $view->escape($description) . '</li>';
+            }
+        }
+
+        switch ($this->getPlacement()) {
+            case self::APPEND:
+                return $content . $html . '</ul></div>';
+            case self::PREPEND:
+                return $html . '</ul></div>' . $content;
+        }
+    }
+
+    /**
+     * Recurse the given form and return the descriptions for it and all of its subforms
+     *
+     * @param   Form    $form   The form to recurse
+     *
+     * @return  array
+     */
+    protected function recurseForm(Form $form)
+    {
+        $descriptions = array($form->getDescriptions());
+        foreach ($form->getSubForms() as $subForm) {
+            $descriptions[] = $this->recurseForm($subForm);
+        }
+
+        return call_user_func_array('array_merge', $descriptions);
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/FormHints.php b/library/Icinga/Web/Form/Decorator/FormHints.php
new file mode 100644
index 0000000..2a0f193
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/FormHints.php
@@ -0,0 +1,142 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Decorator_Abstract;
+use Icinga\Web\Form;
+
+/**
+ * Decorator to add a list of hints at the top or bottom of a form
+ *
+ * The hint for required form elements is automatically being handled.
+ */
+class FormHints extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * A list of element class names to be ignored when detecting which message to use to describe required elements
+     *
+     * @var array
+     */
+    protected $blacklist;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($options = null)
+    {
+        parent::__construct($options);
+        $this->blacklist = array(
+            'Zend_Form_Element_Hidden',
+            'Zend_Form_Element_Submit',
+            'Zend_Form_Element_Button',
+            'Icinga\Web\Form\Element\Note',
+            'Icinga\Web\Form\Element\Button',
+            'Icinga\Web\Form\Element\CsrfCounterMeasure'
+        );
+    }
+
+    /**
+     * Render form hints
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  ?string                  The updated html
+     */
+    public function render($content = '')
+    {
+        $form = $this->getElement();
+        if (! $form instanceof Form) {
+            return $content;
+        }
+
+        $view = $form->getView();
+        if ($view === null) {
+            return $content;
+        }
+
+        $hints = $this->recurseForm($form, $entirelyRequired);
+        if ($entirelyRequired !== null) {
+            $hints[] = sprintf(
+                $form->getView()->translate('%s Required field'),
+                $form->getRequiredCue()
+            );
+        }
+
+        if (empty($hints)) {
+            return $content;
+        }
+
+        $html = '<ul class="form-info">';
+        foreach ($hints as $hint) {
+            if (is_array($hint)) {
+                list($hint, $properties) = $hint;
+                $html .= '<li' . $view->propertiesToString($properties) . '>' . $view->escape($hint) . '</li>';
+            } else {
+                $html .= '<li>' . $view->escape($hint) . '</li>';
+            }
+        }
+
+        switch ($this->getPlacement()) {
+            case self::APPEND:
+                return $content . $html . '</ul>';
+            case self::PREPEND:
+                return $html . '</ul>' . $content;
+        }
+    }
+
+    /**
+     * Recurse the given form and return the hints for it and all of its subforms
+     *
+     * @param   Form    $form               The form to recurse
+     * @param   mixed   $entirelyRequired   Set by reference, true means all elements in the hierarchy are
+     *                                       required, false only a partial subset and null none at all
+     * @param   bool    $elementsPassed     Whether there were any elements passed during the recursion until now
+     *
+     * @return  array
+     */
+    protected function recurseForm(Form $form, &$entirelyRequired = null, $elementsPassed = false)
+    {
+        $requiredLabels = array();
+        if ($form->getRequiredCue() !== null) {
+            $partiallyRequired = $partiallyOptional = false;
+            foreach ($form->getElements() as $element) {
+                if (! in_array($element->getType(), $this->blacklist)) {
+                    if (! $element->isRequired()) {
+                        $partiallyOptional = true;
+                        if ($entirelyRequired) {
+                            $entirelyRequired = false;
+                        }
+                    } else {
+                        $partiallyRequired = true;
+                        if (($label = $element->getDecorator('label')) !== false) {
+                            $requiredLabels[] = $label;
+                        }
+                    }
+                }
+            }
+
+            if (! $elementsPassed) {
+                $elementsPassed = $partiallyRequired || $partiallyOptional;
+                if ($entirelyRequired === null && $partiallyRequired) {
+                    $entirelyRequired = ! $partiallyOptional;
+                }
+            } elseif ($entirelyRequired === null && $partiallyRequired) {
+                $entirelyRequired = false;
+            }
+        }
+
+        $hints = array($form->getHints());
+        foreach ($form->getSubForms() as $subForm) {
+            $hints[] = $this->recurseForm($subForm, $entirelyRequired, $elementsPassed);
+        }
+
+        if ($entirelyRequired) {
+            foreach ($requiredLabels as $label) {
+                $label->setRequiredSuffix('');
+            }
+        }
+
+        return call_user_func_array('array_merge', $hints);
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/FormNotifications.php b/library/Icinga/Web/Form/Decorator/FormNotifications.php
new file mode 100644
index 0000000..87d12aa
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/FormNotifications.php
@@ -0,0 +1,125 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Icinga\Application\Icinga;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Form;
+use Zend_Form_Decorator_Abstract;
+
+/**
+ * Decorator to add a list of notifications at the top or bottom of a form
+ */
+class FormNotifications extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Render form notifications
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  ?string                  The updated html
+     */
+    public function render($content = '')
+    {
+        $form = $this->getElement();
+        if (! $form instanceof Form) {
+            return $content;
+        }
+
+        $view = $form->getView();
+        if ($view === null) {
+            return $content;
+        }
+
+        $notifications = $this->recurseForm($form);
+        if (empty($notifications)) {
+            return $content;
+        }
+
+        $html = '<ul class="form-notification-list">';
+        foreach (array(Form::NOTIFICATION_ERROR, Form::NOTIFICATION_WARNING, Form::NOTIFICATION_INFO) as $type) {
+            if (isset($notifications[$type])) {
+                $html .= '<li><ul class="notification-' . $this->getNotificationTypeName($type) . '">';
+                foreach ($notifications[$type] as $message) {
+                    if (is_array($message)) {
+                        list($message, $properties) = $message;
+                        $html .= '<li' . $view->propertiesToString($properties) . '>'
+                            . $view->escape($message)
+                            . '</li>';
+                    } else {
+                        $html .= '<li>' . $view->escape($message) . '</li>';
+                    }
+                }
+
+                $html .= '</ul></li>';
+            }
+        }
+
+        if (isset($notifications[Form::NOTIFICATION_ERROR])) {
+            $icon = 'cancel';
+            $class = 'error';
+        } elseif (isset($notifications[Form::NOTIFICATION_WARNING])) {
+            $icon = 'warning-empty';
+            $class = 'warning';
+        } else {
+            $icon = 'info';
+            $class = 'info';
+        }
+
+        $html = "<div class=\"form-notifications $class\">"
+        . Icinga::app()->getViewRenderer()->view->icon($icon, '', ['class' => 'form-notification-icon'])
+        . $html;
+
+        switch ($this->getPlacement()) {
+            case self::APPEND:
+                return $content . $html . '</ul></div>';
+            case self::PREPEND:
+                return $html . '</ul></div>' . $content;
+        }
+    }
+
+    /**
+     * Recurse the given form and return the notifications for it and all of its subforms
+     *
+     * @param   Form    $form   The form to recurse
+     *
+     * @return  array
+     */
+    protected function recurseForm(Form $form)
+    {
+        $notifications = $form->getNotifications();
+        foreach ($form->getSubForms() as $subForm) {
+            foreach ($this->recurseForm($subForm) as $type => $messages) {
+                foreach ($messages as $message) {
+                    $notifications[$type][] = $message;
+                }
+            }
+        }
+
+        return $notifications;
+    }
+
+    /**
+     * Return the name for the given notification type
+     *
+     * @param   int     $type
+     *
+     * @return  string
+     *
+     * @throws  ProgrammingError    In case the given type is invalid
+     */
+    protected function getNotificationTypeName($type)
+    {
+        switch ($type) {
+            case Form::NOTIFICATION_ERROR:
+                return 'error';
+            case Form::NOTIFICATION_WARNING:
+                return 'warning';
+            case Form::NOTIFICATION_INFO:
+                return 'info';
+            default:
+                throw new ProgrammingError('Invalid notification type "%s" provided', $type);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/Help.php b/library/Icinga/Web/Form/Decorator/Help.php
new file mode 100644
index 0000000..9e30e86
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/Help.php
@@ -0,0 +1,113 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Element;
+use Zend_Form_Decorator_Abstract;
+use Icinga\Application\Icinga;
+use Icinga\Web\View;
+
+/**
+ * Decorator to add helptext to a form element
+ */
+class Help extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Whether a hidden <span> should be created to describe the decorated form element
+     *
+     * @var bool
+     */
+    protected $accessible = false;
+
+    /**
+     * The id used to identify the description associated with the decorated form element
+     *
+     * @var string
+     */
+    protected $descriptionId;
+
+    /**
+     * Set whether a hidden <span> should be created to describe the decorated form element
+     *
+     * @param   bool    $state
+     *
+     * @return  Help
+     */
+    public function setAccessible($state = true)
+    {
+        $this->accessible = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return the id used to identify the description associated with the decorated element
+     *
+     * @param   Zend_Form_Element   $element    The element for which to generate a id
+     *
+     * @return  string
+     */
+    public function getDescriptionId(Zend_Form_Element $element = null)
+    {
+        if ($this->descriptionId === null) {
+            $element = $element ?: $this->getElement();
+            $this->descriptionId = 'desc_' . $element->getId();
+        }
+
+        return $this->descriptionId;
+    }
+
+    /**
+     * Return the current view
+     *
+     * @return  View
+     */
+    protected function getView()
+    {
+        return Icinga::app()->getViewRenderer()->view;
+    }
+
+    /**
+     * Add a help icon to the left of an element
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  ?string                  The updated html
+     */
+    public function render($content = '')
+    {
+        $element = $this->getElement();
+        $description = $element->getDescription();
+        $requirement = $element->getAttrib('requirement');
+        unset($element->requirement);
+
+        $helpContent = '';
+        if ($description || $requirement) {
+            if ($this->accessible) {
+                $helpContent = '<span id="'
+                    . $this->getDescriptionId()
+                    . '" class="sr-only">'
+                    . $description
+                    . ($description && $requirement ? ' ' : '')
+                    . $requirement
+                    . '</span>';
+            }
+
+            $helpContent = $this->getView()->icon(
+                'info-circled',
+                $description . ($description && $requirement ? ' ' : '') . $requirement,
+                array(
+                    'class'         => 'control-info',
+                    'aria-hidden'   => $this->accessible ? 'true' : 'false'
+                )
+            ) . $helpContent;
+        }
+
+        switch ($this->getPlacement()) {
+            case self::APPEND:
+                return $content . $helpContent;
+            case self::PREPEND:
+                return $helpContent . $content;
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Decorator/Spinner.php b/library/Icinga/Web/Form/Decorator/Spinner.php
new file mode 100644
index 0000000..09a3ae9
--- /dev/null
+++ b/library/Icinga/Web/Form/Decorator/Spinner.php
@@ -0,0 +1,48 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Decorator;
+
+use Zend_Form_Decorator_Abstract;
+use Icinga\Application\Icinga;
+use Icinga\Web\View;
+
+/**
+ * Decorator to add a spinner next to an element
+ */
+class Spinner extends Zend_Form_Decorator_Abstract
+{
+    /**
+     * Return the current view
+     *
+     * @return  View
+     */
+    protected function getView()
+    {
+        return Icinga::app()->getViewRenderer()->view;
+    }
+
+    /**
+     * Add a spinner icon to a form element
+     *
+     * @param   string      $content    The html rendered so far
+     *
+     * @return  ?string                  The updated html
+     */
+    public function render($content = '')
+    {
+        $spinner = '<div '
+            . ($this->getOption('id') !== null ? ' id="' . $this->getOption('id') . '"' : '')
+            . 'class="spinner ' . ($this->getOption('class') ?: '') . '"'
+            . '>'
+            . $this->getView()->icon('spin6')
+            . '</div>';
+
+        switch ($this->getPlacement()) {
+            case self::APPEND:
+                return $content . $spinner;
+            case self::PREPEND:
+                return $spinner . $content;
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Button.php b/library/Icinga/Web/Form/Element/Button.php
new file mode 100644
index 0000000..307247e
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Button.php
@@ -0,0 +1,81 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Request;
+use Icinga\Application\Icinga;
+use Icinga\Web\Form\FormElement;
+use Zend_Config;
+
+/**
+ * A button
+ */
+class Button extends FormElement
+{
+    /**
+     * Use formButton view helper by default
+     *
+     * @var string
+     */
+    public $helper = 'formButton';
+
+    /**
+     * Constructor
+     *
+     * @param   string|array|Zend_Config    $spec       Element name or configuration
+     * @param   string|array|Zend_Config    $options    Element value or configuration
+     */
+    public function __construct($spec, $options = null)
+    {
+        if (is_string($spec) && ((null !== $options) && is_string($options))) {
+            $options = array('label' => $options);
+        }
+
+        if (!isset($options['ignore'])) {
+            $options['ignore'] = true;
+        }
+
+        parent::__construct($spec, $options);
+
+        if ($label = $this->getLabel()) {
+            // Necessary to get the label shown on the generated HTML
+            $this->content = $label;
+        }
+    }
+
+    /**
+     * Validate element value (pseudo)
+     *
+     * There is no need to reset the value
+     *
+     * @param   mixed   $value      Is always ignored
+     * @param   mixed   $context    Is always ignored
+     *
+     * @return  bool                Returns always TRUE
+     */
+    public function isValid($value, $context = null)
+    {
+        return true;
+    }
+
+    /**
+     * Has this button been selected?
+     *
+     * @return  bool
+     */
+    public function isChecked()
+    {
+        return $this->getRequest()->getParam($this->getName()) === $this->getValue();
+    }
+
+    /**
+     * Return the current request
+     *
+     * @return  Request
+     */
+    protected function getRequest()
+    {
+        return Icinga::app()->getRequest();
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Checkbox.php b/library/Icinga/Web/Form/Element/Checkbox.php
new file mode 100644
index 0000000..d4499a0
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Checkbox.php
@@ -0,0 +1,9 @@
+<?php
+/* Icinga Web 2 | (c) 2019 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+class Checkbox extends \Zend_Form_Element_Checkbox
+{
+    public $helper = 'icingaCheckbox';
+}
diff --git a/library/Icinga/Web/Form/Element/CsrfCounterMeasure.php b/library/Icinga/Web/Form/Element/CsrfCounterMeasure.php
new file mode 100644
index 0000000..c59e1f9
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/CsrfCounterMeasure.php
@@ -0,0 +1,99 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Session;
+use Icinga\Web\Form\FormElement;
+use Icinga\Web\Form\InvalidCSRFTokenException;
+
+/**
+ * CSRF counter measure element
+ *
+ * You must not set a value to successfully use this element, just give it a name and you're good to go.
+ */
+class CsrfCounterMeasure extends FormElement
+{
+    /**
+     * Default form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formHidden';
+
+    /**
+     * Counter measure element is required
+     *
+     * @var bool
+     */
+    protected $_ignore = true;
+
+    /**
+     * Ignore element when retrieving values at form level
+     *
+     * @var bool
+     */
+    protected $_required = true;
+
+    /**
+     * Initialize this form element
+     */
+    public function init()
+    {
+        $this->setDecorators(['ViewHelper']);
+        $this->setValue($this->generateCsrfToken());
+    }
+
+    /**
+     * Check whether $value is a valid CSRF token
+     *
+     * @param   string      $value          The value to check
+     * @param   mixed       $context        Context to use
+     *
+     * @return  bool                        True, in case the CSRF token is valid
+     *
+     * @throws  InvalidCSRFTokenException   In case the CSRF token is not valid
+     */
+    public function isValid($value, $context = null)
+    {
+        if (parent::isValid($value, $context) && $this->isValidCsrfToken($value)) {
+            return true;
+        }
+
+        throw new InvalidCSRFTokenException();
+    }
+
+    /**
+     * Check whether the given value is a valid CSRF token for the current session
+     *
+     * @param   string  $token  The CSRF token
+     *
+     * @return  bool
+     */
+    protected function isValidCsrfToken($token)
+    {
+        if (strpos($token, '|') === false) {
+            return false;
+        }
+
+        list($seed, $hash) = explode('|', $token);
+
+        if (false === is_numeric($seed)) {
+            return false;
+        }
+
+        return $hash === hash('sha256', Session::getSession()->getId() . $seed);
+    }
+
+    /**
+     * Generate a new (seed, token) pair
+     *
+     * @return  string
+     */
+    protected function generateCsrfToken()
+    {
+        $seed = mt_rand();
+        $hash = hash('sha256', Session::getSession()->getId() . $seed);
+        return sprintf('%s|%s', $seed, $hash);
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Date.php b/library/Icinga/Web/Form/Element/Date.php
new file mode 100644
index 0000000..8e0985c
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Date.php
@@ -0,0 +1,19 @@
+<?php
+/* Icinga Web 2 | (c) 2017 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Form\FormElement;
+
+/**
+ * A date input control
+ */
+class Date extends FormElement
+{
+    /**
+     * Form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formDate';
+}
diff --git a/library/Icinga/Web/Form/Element/DateTimePicker.php b/library/Icinga/Web/Form/Element/DateTimePicker.php
new file mode 100644
index 0000000..284a744
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/DateTimePicker.php
@@ -0,0 +1,80 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use DateTime;
+use Icinga\Web\Form\FormElement;
+use Icinga\Web\Form\Validator\DateTimeValidator;
+
+/**
+ * A date-and-time input control
+ */
+class DateTimePicker extends FormElement
+{
+    /**
+     * Form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formDateTime';
+
+    /**
+     * @var bool
+     */
+    protected $local = true;
+
+    /**
+     * (non-PHPDoc)
+     * @see Zend_Form_Element::init() For the method documentation.
+     */
+    public function init()
+    {
+        $this->addValidator(
+            new DateTimeValidator($this->local),
+            true  // true for breaking the validator chain on failure
+        );
+    }
+
+    /**
+     * Get the expected date and time format of any user input
+     *
+     * @return string
+     */
+    public function getFormat()
+    {
+        return $this->local ? 'Y-m-d\TH:i:s' : DateTime::RFC3339;
+    }
+
+    /**
+     * Is the date and time valid?
+     *
+     * @param   string|DateTime     $value
+     * @param   mixed               $context
+     *
+     * @return  bool
+     */
+    public function isValid($value, $context = null)
+    {
+        if (is_scalar($value) && $value !== '' && ! preg_match('/\D/', $value)) {
+            $dateTime = new DateTime();
+            $value = $dateTime->setTimestamp($value)->format($this->getFormat());
+        }
+
+        if (! parent::isValid($value, $context)) {
+            return false;
+        }
+
+        if (! $value instanceof DateTime) {
+            $format = $this->getFormat();
+            $dateTime = DateTime::createFromFormat($format, $value);
+            if ($dateTime === false) {
+                $dateTime = DateTime::createFromFormat(substr($format, 0, strrpos($format, ':')), $value);
+            }
+
+            $this->setValue($dateTime);
+        }
+
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Note.php b/library/Icinga/Web/Form/Element/Note.php
new file mode 100644
index 0000000..9569dee
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Note.php
@@ -0,0 +1,55 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Form\FormElement;
+
+/**
+ * A note
+ */
+class Note extends FormElement
+{
+    /**
+     * Form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formNote';
+
+    /**
+     * Ignore element when retrieving values at form level
+     *
+     * @var bool
+     */
+    protected $_ignore = true;
+
+    /**
+     * (non-PHPDoc)
+     * @see Zend_Form_Element::init() For the method documentation.
+     */
+    public function init()
+    {
+        if (count($this->getDecorators()) === 0) {
+            $this->setDecorators(array(
+                'ViewHelper',
+                array(
+                    'HtmlTag',
+                    array('tag' => 'p')
+                )
+            ));
+        }
+    }
+
+    /**
+     * Validate element value (pseudo)
+     *
+     * @param   mixed $value    Ignored
+     *
+     * @return  bool            Always true
+     */
+    public function isValid($value, $context = null)
+    {
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Number.php b/library/Icinga/Web/Form/Element/Number.php
new file mode 100644
index 0000000..afbd07d
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Number.php
@@ -0,0 +1,144 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Form\FormElement;
+
+/**
+ * A number input control
+ */
+class Number extends FormElement
+{
+    /**
+     * Form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formNumber';
+
+    /**
+     * The expected lower bound for the element’s value
+     *
+     * @var float|null
+     */
+    protected $min;
+
+    /**
+     * The expected upper bound for the element’s
+     *
+     * @var float|null
+     */
+    protected $max;
+
+    /**
+     * The value granularity of the element’s value
+     *
+     * Normally, number input controls are limited to an accuracy of integer values.
+     *
+     * @var float|string|null
+     */
+    protected $step;
+
+    /**
+     * (non-PHPDoc)
+     * @see \Zend_Form_Element::init() For the method documentation.
+     */
+    public function init()
+    {
+        if ($this->min !== null || $this->max !== null) {
+            $this->addValidator('Between', true, array(
+                'min'       => $this->min === null ? -INF : $this->min,
+                'max'       => $this->max === null ? INF : $this->max,
+                'inclusive' => true
+            ));
+        }
+    }
+
+    /**
+     * Set the expected lower bound for the element’s value
+     *
+     * @param   float $min
+     *
+     * @return  $this
+     */
+    public function setMin($min)
+    {
+        $this->min = (float) $min;
+        return $this;
+    }
+
+    /**
+     * Get the expected lower bound for the element’s value
+     *
+     * @return float|null
+     */
+    public function getMin()
+    {
+        return $this->min;
+    }
+
+    /**
+     * Set the expected upper bound for the element’s value
+     *
+     * @param   float $max
+     *
+     * @return  $this
+     */
+    public function setMax($max)
+    {
+        $this->max = (float) $max;
+        return $this;
+    }
+
+    /**
+     * Get the expected upper bound for the element’s value
+     *
+     * @return float|null
+     */
+    public function getMax()
+    {
+        return $this->max;
+    }
+
+    /**
+     * Set the value granularity of the element’s value
+     *
+     * @param   float|string $step
+     *
+     * @return  $this
+     */
+    public function setStep($step)
+    {
+        if ($step !== 'any') {
+            $step = (float) $step;
+        }
+        $this->step = $step;
+        return $this;
+    }
+
+    /**
+     * Get the value granularity of the element’s value
+     *
+     * @return float|string|null
+     */
+    public function getStep()
+    {
+        return $this->step;
+    }
+
+    /**
+     * (non-PHPDoc)
+     * @see \Zend_Form_Element::isValid() For the method documentation.
+     */
+    public function isValid($value, $context = null)
+    {
+        $this->setValue($value);
+        $value = $this->getValue();
+        if ($value !== null && $value !== '' && ! is_numeric($value)) {
+            $this->addError(sprintf(t('\'%s\' is not a valid number'), $value));
+            return false;
+        }
+        return parent::isValid($value, $context);
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Textarea.php b/library/Icinga/Web/Form/Element/Textarea.php
new file mode 100644
index 0000000..119cd56
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Textarea.php
@@ -0,0 +1,20 @@
+<?php
+/* Icinga Web 2 | (c) 2019 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Form\FormElement;
+
+class Textarea extends FormElement
+{
+    public $helper = 'formTextarea';
+
+    public function __construct($spec, $options = null)
+    {
+        parent::__construct($spec, $options);
+
+        if ($this->getAttrib('rows') === null) {
+            $this->setAttrib('rows', 3);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Element/Time.php b/library/Icinga/Web/Form/Element/Time.php
new file mode 100644
index 0000000..4b76a33
--- /dev/null
+++ b/library/Icinga/Web/Form/Element/Time.php
@@ -0,0 +1,19 @@
+<?php
+/* Icinga Web 2 | (c) 2017 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Element;
+
+use Icinga\Web\Form\FormElement;
+
+/**
+ * A time input control
+ */
+class Time extends FormElement
+{
+    /**
+     * Form view helper to use for rendering
+     *
+     * @var string
+     */
+    public $helper = 'formTime';
+}
diff --git a/library/Icinga/Web/Form/ErrorLabeller.php b/library/Icinga/Web/Form/ErrorLabeller.php
new file mode 100644
index 0000000..3f822d5
--- /dev/null
+++ b/library/Icinga/Web/Form/ErrorLabeller.php
@@ -0,0 +1,71 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form;
+
+use BadMethodCallException;
+use Zend_Translate_Adapter;
+use Zend_Validate_NotEmpty;
+use Zend_Validate_File_MimeType;
+use Icinga\Web\Form\Validator\DateTimeValidator;
+use Icinga\Web\Form\Validator\ReadablePathValidator;
+use Icinga\Web\Form\Validator\WritablePathValidator;
+
+class ErrorLabeller extends Zend_Translate_Adapter
+{
+    protected $messages;
+
+    public function __construct($options = array())
+    {
+        if (! isset($options['element'])) {
+            throw new BadMethodCallException('Option "element" is missing');
+        }
+
+        $this->messages = $this->createMessages($options['element']);
+    }
+
+    public function isTranslated($messageId, $original = false, $locale = null)
+    {
+        return array_key_exists($messageId, $this->messages);
+    }
+
+    public function translate($messageId, $locale = null)
+    {
+        if (array_key_exists($messageId, $this->messages)) {
+            return $this->messages[$messageId];
+        }
+
+        return $messageId;
+    }
+
+    protected function createMessages($element)
+    {
+        $label = $element->getLabel() ?: $element->getName();
+
+        return array(
+            Zend_Validate_NotEmpty::IS_EMPTY            => sprintf(t('%s is required and must not be empty'), $label),
+            Zend_Validate_File_MimeType::FALSE_TYPE     => sprintf(
+                t('%s (%%value%%) has a false MIME type of "%%type%%"'),
+                $label
+            ),
+            Zend_Validate_File_MimeType::NOT_DETECTED   => sprintf(t('%s (%%value%%) has no MIME type'), $label),
+            WritablePathValidator::NOT_WRITABLE         => sprintf(t('%s is not writable', 'config.path'), $label),
+            WritablePathValidator::DOES_NOT_EXIST       => sprintf(t('%s does not exist', 'config.path'), $label),
+            ReadablePathValidator::NOT_READABLE         => sprintf(t('%s is not readable', 'config.path'), $label),
+            DateTimeValidator::INVALID_DATETIME_FORMAT  => sprintf(
+                t('%s not in the expected format: %%value%%'),
+                $label
+            )
+        );
+    }
+
+    protected function _loadTranslationData($data, $locale, array $options = array())
+    {
+        // nonsense, required as being abstract otherwise...
+    }
+
+    public function toString()
+    {
+        return 'ErrorLabeller'; // nonsense, required as being abstract otherwise...
+    }
+}
diff --git a/library/Icinga/Web/Form/FormElement.php b/library/Icinga/Web/Form/FormElement.php
new file mode 100644
index 0000000..766d916
--- /dev/null
+++ b/library/Icinga/Web/Form/FormElement.php
@@ -0,0 +1,61 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form;
+
+use Zend_Form_Element;
+use Icinga\Web\Form;
+
+/**
+ * Base class for Icinga Web 2 form elements
+ */
+class FormElement extends Zend_Form_Element
+{
+    /**
+     * Whether loading default decorators is disabled
+     *
+     * Icinga Web 2 loads its own default element decorators. For loading Zend's default element decorators set this
+     * property to false.
+     *
+     * @var null|bool
+     */
+    protected $_disableLoadDefaultDecorators;
+
+    /**
+     * Whether loading default decorators is disabled
+     *
+     * @return bool
+     */
+    public function loadDefaultDecoratorsIsDisabled()
+    {
+        return $this->_disableLoadDefaultDecorators === true;
+    }
+
+    /**
+     * Load default decorators
+     *
+     * Icinga Web 2 loads its own default element decorators. For loading Zend's default element decorators set
+     * FormElement::$_disableLoadDefaultDecorators to false.
+     *
+     * @return  $this
+     * @see     Form::$defaultElementDecorators For Icinga Web 2's default element decorators.
+     */
+    public function loadDefaultDecorators()
+    {
+        if ($this->loadDefaultDecoratorsIsDisabled()) {
+            return $this;
+        }
+
+        if (! isset($this->_disableLoadDefaultDecorators)) {
+            $decorators = $this->getDecorators();
+            if (empty($decorators)) {
+                // Load Icinga Web 2's default element decorators
+                $this->addDecorators(Form::$defaultElementDecorators);
+            }
+        } else {
+            // Load Zend's default decorators
+            parent::loadDefaultDecorators();
+        }
+        return $this;
+    }
+}
diff --git a/library/Icinga/Web/Form/InvalidCSRFTokenException.php b/library/Icinga/Web/Form/InvalidCSRFTokenException.php
new file mode 100644
index 0000000..d0eb68a
--- /dev/null
+++ b/library/Icinga/Web/Form/InvalidCSRFTokenException.php
@@ -0,0 +1,11 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form;
+
+/**
+ * Exceptions for invalid form tokens
+ */
+class InvalidCSRFTokenException extends \Exception
+{
+}
diff --git a/library/Icinga/Web/Form/Validator/DateFormatValidator.php b/library/Icinga/Web/Form/Validator/DateFormatValidator.php
new file mode 100644
index 0000000..eacb29c
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/DateFormatValidator.php
@@ -0,0 +1,61 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that checks if a textfield contains a correct date format
+ */
+class DateFormatValidator extends Zend_Validate_Abstract
+{
+
+    /**
+     * Valid date characters according to @see http://www.php.net/manual/en/function.date.php
+     *
+     * @var array
+     *
+     * @see http://www.php.net/manual/en/function.date.php
+     */
+    private $validChars =
+        array('d', 'D', 'j', 'l', 'N', 'S', 'w', 'z', 'W', 'F', 'm', 'M', 'n', 't', 'L', 'o', 'Y', 'y');
+
+    /**
+     * List of sensible time separators
+     *
+     * @var array
+     */
+    private $validSeparators = array(' ', ':', '-', '/', ';', ',', '.');
+
+    /**
+     * Error templates
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates
+     */
+    protected $_messageTemplates = array(
+        'INVALID_CHARACTERS' => 'Invalid date format'
+    );
+
+    /**
+     * Validate the input value
+     *
+     * @param   string  $value      The format string to validate
+     * @param   null    $context    The form context (ignored)
+     *
+     * @return  bool True when the input is valid, otherwise false
+     *
+     * @see     Zend_Validate_Abstract::isValid()
+     */
+    public function isValid($value, $context = null)
+    {
+        $rest = trim($value, join(' ', array_merge($this->validChars, $this->validSeparators)));
+        if (strlen($rest) > 0) {
+            $this->_error('INVALID_CHARACTERS');
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/DateTimeValidator.php b/library/Icinga/Web/Form/Validator/DateTimeValidator.php
new file mode 100644
index 0000000..5ef327d
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/DateTimeValidator.php
@@ -0,0 +1,77 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use DateTime;
+use Zend_Validate_Abstract;
+
+/**
+ * Validator for date-and-time input controls
+ *
+ * @see \Icinga\Web\Form\Element\DateTimePicker For the date-and-time input control.
+ */
+class DateTimeValidator extends Zend_Validate_Abstract
+{
+    const INVALID_DATETIME_TYPE = 'invalidDateTimeType';
+    const INVALID_DATETIME_FORMAT = 'invalidDateTimeFormat';
+
+    /**
+     * The messages to write on differen error states
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates‚
+     */
+    protected $_messageTemplates = array(
+        self::INVALID_DATETIME_TYPE     => 'Invalid type given. Instance of DateTime or date/time string expected',
+        self::INVALID_DATETIME_FORMAT   => 'Date/time string not in the expected format: %value%'
+    );
+
+    protected $local;
+
+    /**
+     * Create a new date-and-time input control validator
+     *
+     * @param bool $local
+     */
+    public function __construct($local)
+    {
+        $this->local = (bool) $local;
+    }
+
+    /**
+     * Is the date and time valid?
+     *
+     * @param   string|DateTime $value
+     * @param   mixed           $context
+     *
+     * @return  bool
+     *
+     * @see     \Zend_Validate_Interface::isValid()
+     */
+    public function isValid($value, $context = null)
+    {
+        if (! $value instanceof DateTime && ! is_string($value)) {
+            $this->_error(self::INVALID_DATETIME_TYPE);
+            return false;
+        }
+
+        if (! $value instanceof DateTime) {
+            $format = $baseFormat = $this->local === true ? 'Y-m-d\TH:i:s' : DateTime::RFC3339;
+            $dateTime = DateTime::createFromFormat($format, $value);
+
+            if ($dateTime === false) {
+                $format = substr($format, 0, strrpos($format, ':'));
+                $dateTime = DateTime::createFromFormat($format, $value);
+            }
+
+            if ($dateTime === false || $dateTime->format($format) !== $value) {
+                $this->_error(self::INVALID_DATETIME_FORMAT, $baseFormat);
+                return false;
+            }
+        }
+
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/InArray.php b/library/Icinga/Web/Form/Validator/InArray.php
new file mode 100644
index 0000000..5d3925e
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/InArray.php
@@ -0,0 +1,28 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_InArray;
+use Icinga\Util\StringHelper;
+
+class InArray extends Zend_Validate_InArray
+{
+    protected function _error($messageKey, $value = null)
+    {
+        if ($messageKey === static::NOT_IN_ARRAY) {
+            $matches = StringHelper::findSimilar($this->_value, $this->_haystack);
+            if (empty($matches)) {
+                $this->_messages[$messageKey] = sprintf(t('"%s" is not in the list of allowed values.'), $this->_value);
+            } else {
+                $this->_messages[$messageKey] = sprintf(
+                    t('"%s" is not in the list of allowed values. Did you mean one of the following?: %s'),
+                    $this->_value,
+                    implode(', ', $matches)
+                );
+            }
+        } else {
+            parent::_error($messageKey, $value);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/InternalUrlValidator.php b/library/Icinga/Web/Form/Validator/InternalUrlValidator.php
new file mode 100644
index 0000000..f936bb5
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/InternalUrlValidator.php
@@ -0,0 +1,41 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Icinga\Application\Icinga;
+use Zend_Validate_Abstract;
+use Icinga\Web\Url;
+
+/**
+ * Validator that checks whether a textfield doesn't contain an external URL
+ */
+class InternalUrlValidator extends Zend_Validate_Abstract
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function isValid($value)
+    {
+        $url = Url::fromPath($value);
+        if ($url->getRelativeUrl() === '' || $url->isExternal()) {
+            $this->_error('IS_EXTERNAL');
+
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function _error($messageKey, $value = null)
+    {
+        if ($messageKey === 'IS_EXTERNAL') {
+            $this->_messages[$messageKey] = t('The url must not be external.');
+        } else {
+            parent::_error($messageKey, $value);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/ReadablePathValidator.php b/library/Icinga/Web/Form/Validator/ReadablePathValidator.php
new file mode 100644
index 0000000..826421c
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/ReadablePathValidator.php
@@ -0,0 +1,53 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that interprets the value as a filepath and checks if it's readable
+ *
+ * This validator should be preferred due to Zend_Validate_File_Exists is
+ * getting confused if there is another element in the form called `name'.
+ */
+class ReadablePathValidator extends Zend_Validate_Abstract
+{
+    const NOT_READABLE = 'notReadable';
+    const DOES_NOT_EXIST = 'doesNotExist';
+
+    /**
+     * The messages to write on different error states
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates‚
+     */
+    protected $_messageTemplates = array(
+        self::NOT_READABLE      => 'Path is not readable',
+        self::DOES_NOT_EXIST    => 'Path does not exist'
+    );
+
+    /**
+     * Check whether the given value is a readable filepath
+     *
+     * @param   string  $value      The value submitted in the form
+     * @param   mixed   $context    The context of the form
+     *
+     * @return  bool                Whether the value was successfully validated
+     */
+    public function isValid($value, $context = null)
+    {
+        if (false === file_exists($value)) {
+            $this->_error(self::DOES_NOT_EXIST);
+            return false;
+        }
+
+        if (false === is_readable($value)) {
+            $this->_error(self::NOT_READABLE);
+            return false;
+        }
+
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/TimeFormatValidator.php b/library/Icinga/Web/Form/Validator/TimeFormatValidator.php
new file mode 100644
index 0000000..9c1c99a
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/TimeFormatValidator.php
@@ -0,0 +1,58 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that checks if a textfield contains a correct time format
+ */
+class TimeFormatValidator extends Zend_Validate_Abstract
+{
+
+    /**
+     * Valid time characters according to @see http://www.php.net/manual/en/function.date.php
+     *
+     * @var array
+     * @see http://www.php.net/manual/en/function.date.php
+     */
+    private $validChars = array('a', 'A', 'B', 'g', 'G', 'h', 'H', 'i', 's', 'u');
+
+    /**
+     * List of sensible time separators
+     *
+     * @var array
+     */
+    private $validSeparators = array(' ', ':', '-', '/', ';', ',', '.');
+
+    /**
+     * Error templates
+     *
+     * @var array
+     * @see Zend_Validate_Abstract::$_messageTemplates
+     */
+    protected $_messageTemplates = array(
+        'INVALID_CHARACTERS' => 'Invalid time format'
+    );
+
+    /**
+     * Validate the input value
+     *
+     * @param   string    $value    The format string to validate
+     * @param   null      $context  The form context (ignored)
+     *
+     * @return  bool True when the input is valid, otherwise false
+     *
+     * @see     Zend_Validate_Abstract::isValid()
+     */
+    public function isValid($value, $context = null)
+    {
+        $rest = trim($value, join(' ', array_merge($this->validChars, $this->validSeparators)));
+        if (strlen($rest) > 0) {
+            $this->_error('INVALID_CHARACTERS');
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/UrlValidator.php b/library/Icinga/Web/Form/Validator/UrlValidator.php
new file mode 100644
index 0000000..b1b578f
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/UrlValidator.php
@@ -0,0 +1,40 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that checks whether a textfield doesn't contain raw double quotes
+ */
+class UrlValidator extends Zend_Validate_Abstract
+{
+    /**
+     * Constructor
+     */
+    public function __construct()
+    {
+        $this->_messageTemplates = array('HAS_QUOTES' => t(
+            'The url must not contain raw double quotes. If you really need double quotes, use %22 instead.'
+        ));
+    }
+
+    /**
+     * Validate the input value
+     *
+     * @param   string  $value      The string to validate
+     *
+     * @return  bool    true if and only if the input is valid, otherwise false
+     *
+     * @see     Zend_Validate_Abstract::isValid()
+     */
+    public function isValid($value)
+    {
+        $hasQuotes = false === strpos($value, '"');
+        if (! $hasQuotes) {
+            $this->_error('HAS_QUOTES');
+        }
+        return $hasQuotes;
+    }
+}
diff --git a/library/Icinga/Web/Form/Validator/WritablePathValidator.php b/library/Icinga/Web/Form/Validator/WritablePathValidator.php
new file mode 100644
index 0000000..76efb58
--- /dev/null
+++ b/library/Icinga/Web/Form/Validator/WritablePathValidator.php
@@ -0,0 +1,72 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form\Validator;
+
+use Zend_Validate_Abstract;
+
+/**
+ * Validator that interprets the value as a path and checks if it's writable
+ */
+class WritablePathValidator extends Zend_Validate_Abstract
+{
+    const NOT_WRITABLE = 'notWritable';
+    const DOES_NOT_EXIST = 'doesNotExist';
+
+    /**
+     * The messages to write on differen error states
+     *
+     * @var array
+     *
+     * @see Zend_Validate_Abstract::$_messageTemplates‚
+     */
+    protected $_messageTemplates = array(
+        self::NOT_WRITABLE      => 'Path is not writable',
+        self::DOES_NOT_EXIST    => 'Path does not exist'
+    );
+
+    /**
+     * When true, the file or directory must exist
+     *
+     * @var bool
+     */
+    private $requireExistence = false;
+
+    /**
+     * Set this validator to require the target file to exist
+     */
+    public function setRequireExistence()
+    {
+        $this->requireExistence = true;
+    }
+
+    /**
+     * Check whether the given value is writable path
+     *
+     * @param   string  $value      The value submitted in the form
+     * @param   mixed   $context    The context of the form
+     *
+     * @return  bool True when validation worked, otherwise false
+     *
+     * @see     Zend_Validate_Abstract::isValid()
+     */
+    public function isValid($value, $context = null)
+    {
+        $value = (string) $value;
+
+        $this->_setValue($value);
+        if ($this->requireExistence && !file_exists($value)) {
+            $this->_error(self::DOES_NOT_EXIST);
+            return false;
+        }
+
+        if ((file_exists($value) && is_writable($value)) ||
+            (is_dir(dirname($value)) && is_writable(dirname($value)))
+        ) {
+            return true;
+        }
+
+        $this->_error(self::NOT_WRITABLE);
+        return false;
+    }
+}
diff --git a/library/Icinga/Web/Helper/CookieHelper.php b/library/Icinga/Web/Helper/CookieHelper.php
new file mode 100644
index 0000000..cc7c448
--- /dev/null
+++ b/library/Icinga/Web/Helper/CookieHelper.php
@@ -0,0 +1,81 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Helper;
+
+use Icinga\Web\Request;
+
+/**
+ * Helper Class Cookie
+ */
+class CookieHelper
+{
+    /**
+     * The name of the control cookie
+     */
+    const CHECK_COOKIE = '_chc';
+
+    /**
+     * The request
+     *
+     * @var Request
+     */
+    protected $request;
+
+    /**
+     * Create a new cookie
+     *
+     * @param Request $request
+     */
+    public function __construct(Request $request)
+    {
+        $this->request = $request;
+    }
+
+    /**
+     * Check whether cookies are supported or not
+     *
+     * @return bool
+     */
+    public function isSupported()
+    {
+        if (! empty($_COOKIE)) {
+            $this->cleanupCheck();
+            return true;
+        }
+
+        $url = $this->request->getUrl();
+
+        if ($url->hasParam('_checkCookie') && empty($_COOKIE)) {
+            return false;
+        }
+
+        if (! $url->hasParam('_checkCookie')) {
+            $this->provideCheck();
+        }
+
+        return false;
+    }
+
+    /**
+     * Prepare check to detect cookie support
+     */
+    public function provideCheck()
+    {
+        setcookie(self::CHECK_COOKIE, '1');
+
+        $requestUri = $this->request->getUrl()->addParams(array('_checkCookie' => 1));
+        $this->request->getResponse()->redirectAndExit($requestUri);
+    }
+
+    /**
+     * Cleanup the cookie support check
+     */
+    public function cleanupCheck()
+    {
+        if ($this->request->getUrl()->hasParam('_checkCookie') && isset($_COOKIE[self::CHECK_COOKIE])) {
+            $requestUri =$this->request->getUrl()->without('_checkCookie');
+            $this->request->getResponse()->redirectAndExit($requestUri);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Helper/HtmlPurifier.php b/library/Icinga/Web/Helper/HtmlPurifier.php
new file mode 100644
index 0000000..19fd207
--- /dev/null
+++ b/library/Icinga/Web/Helper/HtmlPurifier.php
@@ -0,0 +1,95 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Helper;
+
+use Closure;
+use Icinga\Web\FileCache;
+use InvalidArgumentException;
+
+class HtmlPurifier
+{
+    /**
+     * The actual purifier instance
+     *
+     * @var \HTMLPurifier
+     */
+    protected $purifier;
+
+    /**
+     * Create a new HtmlPurifier
+     *
+     * @param   array|Closure   $config     Additional configuration
+     */
+    public function __construct($config = null)
+    {
+        $purifierConfig = \HTMLPurifier_Config::createDefault();
+        $purifierConfig->set('Core.EscapeNonASCIICharacters', true);
+        $purifierConfig->set('Attr.AllowedFrameTargets', array('_blank'));
+
+        if (($cachePath = FileCache::instance()->directory('htmlpurifier.cache')) !== false) {
+            $purifierConfig->set('Cache.SerializerPath', $cachePath);
+        } else {
+            $purifierConfig->set('Cache.DefinitionImpl', null);
+        }
+
+        // This avoids permission problems:
+        // $purifierConfig->set('Core.DefinitionCache', null);
+
+        // $purifierConfig->set('URI.Base', 'http://www.example.com');
+        // $purifierConfig->set('URI.MakeAbsolute', true);
+
+        $this->configure($purifierConfig);
+
+        if ($config instanceof Closure) {
+            call_user_func($config, $purifierConfig);
+        } elseif (is_array($config)) {
+            $purifierConfig->loadArray($config);
+        } elseif ($config !== null) {
+            throw new InvalidArgumentException('$config must be either a Closure or array');
+        }
+
+        $this->purifier = new \HTMLPurifier($purifierConfig);
+    }
+
+    /**
+     * Apply additional default configuration
+     *
+     * May be overwritten by more concrete purifier implementations.
+     *
+     * @param   \HTMLPurifier_Config    $config
+     */
+    protected function configure($config)
+    {
+    }
+
+    /**
+     * Purify and return the given HTML string
+     *
+     * @param   string          $html
+     * @param   array|Closure   $config     Configuration to use instead of the default
+     *
+     * @return  string
+     */
+    public function purify($html, $config = null)
+    {
+        return $this->purifier->purify($html, $config);
+    }
+
+    /**
+     * Purify and return the given HTML string
+     *
+     * Convenience method to bypass object creation.
+     *
+     * @param   string          $html
+     * @param   array|Closure   $config     Additional configuration
+     *
+     * @return  string
+     */
+    public static function process($html, $config = null)
+    {
+        $purifier = new static($config);
+
+        return $purifier->purify($html);
+    }
+}
diff --git a/library/Icinga/Web/Helper/Markdown.php b/library/Icinga/Web/Helper/Markdown.php
new file mode 100644
index 0000000..cb854b4
--- /dev/null
+++ b/library/Icinga/Web/Helper/Markdown.php
@@ -0,0 +1,34 @@
+<?php
+/* Icinga Web 2 | (c) 2019 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Helper;
+
+use Icinga\Web\Helper\Markdown\LinkTransformer;
+use Parsedown;
+
+class Markdown
+{
+    public static function line($content, $config = null)
+    {
+        if ($config === null) {
+            $config = function (\HTMLPurifier_Config $config) {
+                $config->set('HTML.Parent', 'span'); // Only allow inline elements
+
+                LinkTransformer::attachTo($config);
+            };
+        }
+
+        return HtmlPurifier::process(Parsedown::instance()->line($content), $config);
+    }
+
+    public static function text($content, $config = null)
+    {
+        if ($config === null) {
+            $config = function (\HTMLPurifier_Config $config) {
+                LinkTransformer::attachTo($config);
+            };
+        }
+
+        return HtmlPurifier::process(Parsedown::instance()->text($content), $config);
+    }
+}
diff --git a/library/Icinga/Web/Helper/Markdown/LinkTransformer.php b/library/Icinga/Web/Helper/Markdown/LinkTransformer.php
new file mode 100644
index 0000000..f323085
--- /dev/null
+++ b/library/Icinga/Web/Helper/Markdown/LinkTransformer.php
@@ -0,0 +1,73 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Helper\Markdown;
+
+use HTMLPurifier_AttrTransform;
+use HTMLPurifier_Config;
+use ipl\Web\Url;
+
+class LinkTransformer extends HTMLPurifier_AttrTransform
+{
+    /**
+     * Link targets that are considered to have a thumbnail
+     *
+     * @var string[]
+     */
+    public static $IMAGE_FILES = [
+        'jpg',
+        'jpeg',
+        'png',
+        'bmp',
+        'gif',
+        'heif',
+        'heic',
+        'webp'
+    ];
+
+    public function transform($attr, $config, $context)
+    {
+        if (! isset($attr['href'])) {
+            return $attr;
+        }
+
+        $url = Url::fromPath($attr['href']);
+        $fileName = basename($url->getPath());
+
+        $ext = null;
+        if (($extAt = strrpos($fileName, '.')) !== false) {
+            $ext = substr($fileName, $extAt + 1);
+        }
+
+        $hasThumbnail = $ext !== null && in_array($ext, static::$IMAGE_FILES, true);
+        if ($hasThumbnail) {
+            // I would have liked to not only base this off of the extension, but also by
+            // whether there is an actual img tag inside the anchor. Seems not possible :(
+            $attr['class'] = 'with-thumbnail';
+        }
+
+        if (! isset($attr['target'])) {
+            if ($url->isExternal()) {
+                $attr['target'] = '_blank';
+            } else {
+                $attr['data-base-target'] = '_next';
+            }
+        }
+
+        return $attr;
+    }
+
+    public static function attachTo(HTMLPurifier_Config $config)
+    {
+        $module = $config->getHTMLDefinition(true)
+            ->getAnonymousModule();
+
+        if (isset($module->info['a'])) {
+            $a = $module->info['a'];
+        } else {
+            $a = $module->addBlankElement('a');
+        }
+
+        $a->attr_transform_post[] = new self();
+    }
+}
diff --git a/library/Icinga/Web/Hook.php b/library/Icinga/Web/Hook.php
new file mode 100644
index 0000000..b098518
--- /dev/null
+++ b/library/Icinga/Web/Hook.php
@@ -0,0 +1,16 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Hook as NewHookImplementation;
+
+/**
+ * Icinga Web Hook registry
+ *
+ * @deprecated It is highly recommended to use {@see Icinga\Application\Hook} instead. Though since this message
+ *             (or rather the previous message) hasn't been visible for ages... This won't be removed anyway....
+ */
+class Hook extends NewHookImplementation
+{
+}
diff --git a/library/Icinga/Web/JavaScript.php b/library/Icinga/Web/JavaScript.php
new file mode 100644
index 0000000..1865136
--- /dev/null
+++ b/library/Icinga/Web/JavaScript.php
@@ -0,0 +1,269 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Exception\Json\JsonDecodeException;
+use Icinga\Util\Json;
+use JShrink\Minifier;
+
+class JavaScript
+{
+    /** @var string */
+    const DEFINE_RE =
+        '/(?<!\.)define\(\s*([\'"][^\'"]*[\'"])?[,\s]*(\[[^]]*\])?[,\s]*((?>function\s*\([^)]*\)|[^=]*=>|\w+).*)/';
+
+    protected static $jsFiles = [
+        'js/helpers.js',
+        'js/icinga.js',
+        'js/icinga/logger.js',
+        'js/icinga/storage.js',
+        'js/icinga/utils.js',
+        'js/icinga/ui.js',
+        'js/icinga/timer.js',
+        'js/icinga/loader.js',
+        'js/icinga/eventlistener.js',
+        'js/icinga/events.js',
+        'js/icinga/history.js',
+        'js/icinga/module.js',
+        'js/icinga/timezone.js',
+        'js/icinga/behavior/application-state.js',
+        'js/icinga/behavior/autofocus.js',
+        'js/icinga/behavior/collapsible.js',
+        'js/icinga/behavior/detach.js',
+        'js/icinga/behavior/dropdown.js',
+        'js/icinga/behavior/navigation.js',
+        'js/icinga/behavior/form.js',
+        'js/icinga/behavior/actiontable.js',
+        'js/icinga/behavior/flyover.js',
+        'js/icinga/behavior/filtereditor.js',
+        'js/icinga/behavior/selectable.js',
+        'js/icinga/behavior/modal.js',
+        'js/icinga/behavior/input-enrichment.js',
+        'js/icinga/behavior/datetime-picker.js',
+        'js/icinga/behavior/copy-to-clipboard.js'
+    ];
+
+    protected static $vendorFiles = [];
+
+    protected static $baseFiles = [
+        'js/define.js'
+    ];
+
+    public static function sendMinified()
+    {
+        self::send(true);
+    }
+
+    /**
+     * Send the client side script code to the client
+     *
+     * Does not cache the client side script code if the HTTP header Cache-Control or Pragma is set to no-cache.
+     *
+     * @param   bool    $minified   Whether to compress the client side script code
+     */
+    public static function send($minified = false)
+    {
+        header('Content-Type: application/javascript');
+        $basedir = Icinga::app()->getBootstrapDirectory();
+        $moduleManager = Icinga::app()->getModuleManager();
+
+        $files = [];
+        $js = $out = '';
+        $min = $minified ? '.min' : '';
+
+        // Prepare vendor file list
+        $vendorFiles = [];
+        foreach (self::$vendorFiles as $file) {
+            $filePath = $basedir . '/' . $file . $min . '.js';
+            $vendorFiles[] = $filePath;
+            $files[] = $filePath;
+        }
+
+        // Prepare base file list
+        $baseFiles = [];
+        foreach (self::$baseFiles as $file) {
+            $filePath = $basedir . '/' . $file;
+            $baseFiles[] = $filePath;
+            $files[] = $filePath;
+        }
+
+        // Prepare library file list
+        foreach (Icinga::app()->getLibraries() as $library) {
+            $files = array_merge($files, $library->getJsAssets());
+        }
+
+        // Prepare core file list
+        $coreFiles = [];
+        foreach (self::$jsFiles as $file) {
+            $filePath = $basedir . '/' . $file;
+            $coreFiles[] = $filePath;
+            $files[] = $filePath;
+        }
+
+        $moduleFiles = [];
+        foreach ($moduleManager->getLoadedModules() as $name => $module) {
+            if ($module->hasJs()) {
+                $jsDir = $module->getJsDir();
+                foreach ($module->getJsFiles() as $path) {
+                    if (file_exists($path)) {
+                        $moduleFiles[$name][$jsDir][] = $path;
+                        $files[] = $path;
+                    }
+                }
+            }
+        }
+
+        $request = Icinga::app()->getRequest();
+        $noCache = $request->getHeader('Cache-Control') === 'no-cache' || $request->getHeader('Pragma') === 'no-cache';
+
+        header('Cache-Control: public,no-cache,must-revalidate');
+
+        if (! $noCache && FileCache::etagMatchesFiles($files)) {
+            header("HTTP/1.1 304 Not Modified");
+            return;
+        } else {
+            $etag = FileCache::etagForFiles($files);
+        }
+
+        header('ETag: "' . $etag . '"');
+        header('Content-Type: application/javascript');
+
+        $cacheFile = 'icinga-' . $etag . $min . '.js';
+        $cache = FileCache::instance();
+        if (! $noCache && $cache->has($cacheFile)) {
+            $cache->send($cacheFile);
+            return;
+        }
+
+        // We do not minify vendor files
+        foreach ($vendorFiles as $file) {
+            $out .= ';' . ltrim(trim(file_get_contents($file)), ';') . "\n";
+        }
+
+        $baseJs = '';
+        foreach ($baseFiles as $file) {
+            $baseJs .= file_get_contents($file) . "\n\n\n";
+        }
+
+        // Library files need to be namespaced first before they can be included
+        foreach (Icinga::app()->getLibraries() as $library) {
+            foreach ($library->getJsAssets() as $file) {
+                $alreadyMinified = false;
+                if ($minified && file_exists(($minFile = substr($file, 0, -3) . '.min.js'))) {
+                    $alreadyMinified = true;
+                    $file = $minFile;
+                }
+
+                $content = self::optimizeDefine(
+                    file_get_contents($file),
+                    $file,
+                    $library->getJsAssetPath(),
+                    $library->getName()
+                );
+
+                if ($alreadyMinified) {
+                    $out .= ';' . ltrim(trim($content), ';') . "\n";
+                } else {
+                    $js .= $content . "\n\n\n";
+                }
+            }
+        }
+
+        foreach ($coreFiles as $file) {
+            $js .= file_get_contents($file) . "\n\n\n";
+        }
+
+        foreach ($moduleFiles as $name => $paths) {
+            foreach ($paths as $basePath => $filePaths) {
+                foreach ($filePaths as $file) {
+                    $content = self::optimizeDefine(file_get_contents($file), $file, $basePath, $name);
+                    if (substr($file, -7, 7) === '.min.js') {
+                        $out .= ';' . ltrim(trim($content), ';') . "\n";
+                    } else {
+                        $js .= $content . "\n\n\n";
+                    }
+                }
+            }
+        }
+
+        if ($minified) {
+            $out .= Minifier::minify($js, ['flaggedComments' => false]);
+            $baseOut = Minifier::minify($baseJs, ['flaggedComments' => false]);
+            $out = ';' . ltrim($baseOut, ';') . "\n" . $out;
+        } else {
+            $out = $baseJs . $out . $js;
+        }
+
+        $cache->store($cacheFile, $out);
+        echo $out;
+    }
+
+    /**
+     * Optimize define() calls in the given JS
+     *
+     * @param string $js
+     * @param string $filePath
+     * @param string $basePath
+     * @param string $packageName
+     *
+     * @return string
+     */
+    public static function optimizeDefine($js, $filePath, $basePath, $packageName)
+    {
+        if (! preg_match(self::DEFINE_RE, $js, $match) || strpos($js, 'define.amd') !== false) {
+            return $js;
+        }
+
+        try {
+            $assetName = $match[1] ? Json::decode($match[1]) : '';
+            if (! $assetName) {
+                $assetName = explode('.', basename($filePath))[0];
+            }
+
+            $assetName = join(DIRECTORY_SEPARATOR, array_filter([
+                $packageName,
+                ltrim(substr(dirname($filePath), strlen($basePath)), DIRECTORY_SEPARATOR),
+                $assetName
+            ]));
+
+            $assetName = Json::encode($assetName, JSON_UNESCAPED_SLASHES);
+        } catch (JsonDecodeException $_) {
+            $assetName = $match[1];
+            Logger::debug('Can\'t optimize name of "%s". Are single quotes used instead of double quotes?', $filePath);
+        }
+
+        try {
+            $dependencies = $match[2] ? Json::decode($match[2]) : [];
+            foreach ($dependencies as &$dependencyName) {
+                if ($dependencyName === 'exports') {
+                    // exports is a special keyword and doesn't need optimization
+                    continue;
+                }
+
+                if (preg_match('~^((?:\.\.?/)+)*(.*)~', $dependencyName, $natch)) {
+                    $dependencyName = join(DIRECTORY_SEPARATOR, array_filter([
+                        $packageName,
+                        ltrim(substr(
+                            realpath(join(DIRECTORY_SEPARATOR, [dirname($filePath), $natch[1]])),
+                            strlen(realpath($basePath))
+                        ), DIRECTORY_SEPARATOR),
+                        $natch[2]
+                    ]));
+                }
+            }
+
+            $dependencies = Json::encode($dependencies, JSON_UNESCAPED_SLASHES);
+        } catch (JsonDecodeException $_) {
+            $dependencies = $match[2];
+            Logger::debug(
+                'Can\'t optimize dependencies of "%s". Are single quotes used instead of double quotes?',
+                $filePath
+            );
+        }
+
+        return str_replace($match[0], sprintf("define(%s, %s, %s", $assetName, $dependencies, $match[3]), $js);
+    }
+}
diff --git a/library/Icinga/Web/LessCompiler.php b/library/Icinga/Web/LessCompiler.php
new file mode 100644
index 0000000..d7eda09
--- /dev/null
+++ b/library/Icinga/Web/LessCompiler.php
@@ -0,0 +1,255 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Logger;
+use Icinga\Util\LessParser;
+use Less_Exception_Parser;
+
+/**
+ * Compile LESS into CSS
+ *
+ * Comments will be removed always. lessc is messing them up.
+ */
+class LessCompiler
+{
+    /**
+     * lessphp compiler
+     *
+     * @var LessParser
+     */
+    protected $lessc;
+
+    /**
+     * Array of LESS files
+     *
+     * @var string[]
+     */
+    protected $lessFiles = array();
+
+    /**
+     * Array of module LESS files indexed by module names
+     *
+     * @var array[]
+     */
+    protected $moduleLessFiles = array();
+
+    /**
+     * LESS source
+     *
+     * @var string
+     */
+    protected $source;
+
+    /**
+     * Path of the LESS theme
+     *
+     * @var string
+     */
+    protected $theme;
+
+    /**
+     * Path of the LESS theme mode
+     *
+     * @var string
+     */
+    protected $themeMode;
+
+    /**
+     * Create a new LESS compiler
+     */
+    public function __construct()
+    {
+        $this->lessc = new LessParser();
+    }
+
+    /**
+     * Add a Web 2 LESS file
+     *
+     * @param   string  $lessFile   Path to the LESS file
+     *
+     * @return  $this
+     */
+    public function addLessFile($lessFile)
+    {
+        $this->lessFiles[] = realpath($lessFile);
+        return $this;
+    }
+
+    /**
+     * Add a module LESS file
+     *
+     * @param   string  $moduleName Name of the module
+     * @param   string  $lessFile   Path to the LESS file
+     *
+     * @return  $this
+     */
+    public function addModuleLessFile($moduleName, $lessFile)
+    {
+        if (! isset($this->moduleLessFiles[$moduleName])) {
+            $this->moduleLessFiles[$moduleName] = array();
+        }
+        $this->moduleLessFiles[$moduleName][] = realpath($lessFile);
+        return $this;
+    }
+
+    /**
+     * Get the list of LESS files added to the compiler
+     *
+     * @return string[]
+     */
+    public function getLessFiles()
+    {
+        $lessFiles = $this->lessFiles;
+
+        foreach ($this->moduleLessFiles as $moduleLessFiles) {
+            $lessFiles = array_merge($lessFiles, $moduleLessFiles);
+        }
+
+        if ($this->theme !== null) {
+            $lessFiles[] = $this->theme;
+        }
+
+        if ($this->themeMode !== null) {
+            $lessFiles[] = $this->themeMode;
+        }
+
+        return $lessFiles;
+    }
+
+    /**
+     * Set the path to the LESS theme
+     *
+     * @param   ?string  $theme  Path to the LESS theme
+     *
+     * @return  $this
+     */
+    public function setTheme($theme)
+    {
+        if ($theme === null || (is_file($theme) && is_readable($theme))) {
+            $this->theme = $theme;
+        } else {
+            Logger::error('Can\t load theme %s. Make sure that the theme exists and is readable', $theme);
+        }
+        return $this;
+    }
+
+    /**
+     * Set the path to the LESS theme mode
+     *
+     * @param   string  $themeMode  Path to the LESS theme mode
+     *
+     * @return  $this
+     */
+    public function setThemeMode($themeMode)
+    {
+        if (is_file($themeMode) && is_readable($themeMode)) {
+            $this->themeMode = $themeMode;
+        } else {
+            Logger::error('Can\t load theme mode %s. Make sure that the theme mode exists and is readable', $themeMode);
+        }
+        return $this;
+    }
+
+    /**
+     * Instruct the compiler to minify CSS
+     *
+     * @return  $this
+     */
+    public function compress()
+    {
+        $this->lessc->setFormatter('compressed');
+        return $this;
+    }
+
+    /**
+     * Render to CSS
+     *
+     * @return  string
+     */
+    public function render()
+    {
+        foreach ($this->lessFiles as $lessFile) {
+            $this->source .= file_get_contents($lessFile);
+        }
+
+        $moduleCss = '';
+        $exportedVars = [];
+        foreach ($this->moduleLessFiles as $moduleName => $moduleLessFiles) {
+            $moduleCss .= '.icinga-module.module-' . $moduleName . ' {';
+
+            foreach ($moduleLessFiles as $moduleLessFile) {
+                $content = file_get_contents($moduleLessFile);
+
+                $pattern = '/^@exports:\s*{((?:\s*@[^:}]+:[^;]*;\s+)+)};$/m';
+                if (preg_match_all($pattern, $content, $matches, PREG_SET_ORDER)) {
+                    foreach ($matches as $match) {
+                        $content = str_replace($match[0], '', $content);
+                        foreach (explode("\n", trim($match[1])) as $line) {
+                            list($name, $value) = explode(':', $line, 2);
+                            $exportedVars[trim($name)] = trim($value, ' ;');
+                        }
+                    }
+                }
+
+                $moduleCss .= $content;
+            }
+
+            $moduleCss .= '}';
+        }
+
+        $this->source .= $moduleCss;
+
+        $varExports = '';
+        foreach ($exportedVars as $name => $value) {
+            $varExports .= sprintf("%s: %s;\n", $name, $value);
+        }
+
+        // exported vars are injected at the beginning to avoid that they are
+        // able to override other variables, that's what themes are for
+        $this->source = $varExports . "\n\n" . $this->source;
+
+        if ($this->theme !== null) {
+            $this->source .= file_get_contents($this->theme);
+        }
+
+        if ($this->themeMode !== null) {
+            $this->source .= file_get_contents($this->themeMode);
+        }
+
+        try {
+            return preg_replace(
+                '/(\.icinga-module\.module-[^\s]+) (#layout\.[^\s]+)/m',
+                '\2 \1',
+                $this->lessc->compile($this->source)
+            );
+        } catch (Less_Exception_Parser $e) {
+            $excerpt = substr($this->source, $e->index - 500, 1000);
+
+            $lines = [];
+            $found = false;
+            $pos = $e->index - 500;
+            foreach (explode("\n", $excerpt) as $i => $line) {
+                if ($i === 0) {
+                    $pos += strlen($line);
+                    $lines[] = '.. ' . $line;
+                } else {
+                    $pos += strlen($line) + 1;
+                    $sep = '   ';
+                    if (! $found && $pos > $e->index) {
+                        $found = true;
+                        $sep = '!! ';
+                    }
+
+                    $lines[] = $sep . $line;
+                }
+            }
+
+            $lines[] = '..';
+            $excerpt = join("\n", $lines);
+
+            return sprintf("%s\n%s\n\n\n%s", $e->getMessage(), $e->getTraceAsString(), $excerpt);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Menu.php b/library/Icinga/Web/Menu.php
new file mode 100644
index 0000000..dc1cdc8
--- /dev/null
+++ b/library/Icinga/Web/Menu.php
@@ -0,0 +1,152 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Logger;
+use Icinga\Authentication\Auth;
+use Icinga\Web\Navigation\Navigation;
+
+/**
+ * Main menu for Icinga Web 2
+ */
+class Menu extends Navigation
+{
+    /**
+     * Create the main menu
+     */
+    public function __construct()
+    {
+        $this->init();
+        $this->load('menu-item');
+    }
+
+    /**
+     * Setup the main menu
+     */
+    public function init()
+    {
+        $this->addItem('dashboard', [
+            'label'     => t('Dashboard'),
+            'url'       => 'dashboard',
+            'icon'      => 'dashboard',
+            'priority'  => 10
+        ]);
+        $this->addItem('system', [
+            'cssClass'  => 'system-nav-item',
+            'label'     => t('System'),
+            'icon'      => 'services',
+            'priority'  => 700,
+            'renderer'  => [
+                'SummaryNavigationItemRenderer',
+                'state' => 'critical'
+            ],
+            'children'  => [
+                'about' => [
+                    'icon'        => 'info',
+                    'description' => t('Open about page'),
+                    'label'       => t('About'),
+                    'url'         => 'about',
+                    'priority'    => 700
+                ],
+                'health' => [
+                    'icon'        => 'eye',
+                    'description' => t('Open health overview'),
+                    'label'       => t('Health'),
+                    'url'         => 'health',
+                    'priority'    => 710,
+                    'renderer'    => 'HealthNavigationRenderer'
+                ],
+                'announcements' => [
+                    'icon'        => 'megaphone',
+                    'description' => t('List announcements'),
+                    'label'       => t('Announcements'),
+                    'url'         => 'announcements',
+                    'priority'    => 720
+                ],
+                'sessions' => [
+                    'icon'        => 'host',
+                    'description' => t('List of users who stay logged in'),
+                    'label'       => t('User Sessions'),
+                    'permission'  => 'application/sessions',
+                    'url'         => 'manage-user-devices',
+                    'priority'    => 730
+                ]
+            ]
+        ]);
+        $this->addItem('configuration', [
+            'cssClass'      => 'configuration-nav-item',
+            'label'         => t('Configuration'),
+            'icon'          => 'wrench',
+            'permission'    => 'config/*',
+            'priority'      => 800,
+            'children'      => [
+                'application' => [
+                    'icon'        => 'wrench',
+                    'description' => t('Open application configuration'),
+                    'label'       => t('Application'),
+                    'url'         => 'config',
+                    'priority'    => 810
+                ],
+                'authentication' => [
+                    'icon'        => 'users',
+                    'description' => t('Open access control configuration'),
+                    'label'       => t('Access Control'),
+                    'permission'  => 'config/access-control/*',
+                    'priority'    => 830,
+                    'url'         => 'role'
+                ],
+                'navigation' => [
+                    'icon'        => 'sitemap',
+                    'description' => t('Open shared navigation configuration'),
+                    'label'       => t('Shared Navigation'),
+                    'url'         => 'navigation/shared',
+                    'permission'  => 'config/navigation',
+                    'priority'    => 840,
+                ],
+                'modules' => [
+                    'icon'        => 'cubes',
+                    'description' => t('Open module configuration'),
+                    'label'       => t('Modules'),
+                    'url'         => 'config/modules',
+                    'permission'  => 'config/modules',
+                    'priority'    => 890
+                ]
+            ]
+        ]);
+        $this->addItem('user', [
+            'cssClass'  => 'user-nav-item',
+            'label'     => Auth::getInstance()->getUser()->getUsername(),
+            'icon'      => 'user',
+            'priority'  => 900,
+            'children'  => [
+                'account' => [
+                    'icon'        => 'sliders',
+                    'description' => t('Open your account preferences'),
+                    'label'       => t('My Account'),
+                    'priority'    => 100,
+                    'url'         => 'account'
+                ],
+                'logout' => [
+                    'icon'        => 'off',
+                    'description' => t('Log out'),
+                    'label'       => t('Logout'),
+                    'priority'    => 200,
+                    'attributes'  => ['target' => '_self'],
+                    'url'         => 'authentication/logout'
+                ]
+            ]
+        ]);
+
+        if (Logger::writesToFile()) {
+            $this->getItem('system')->addChild($this->createItem('application_log', [
+                'icon'        => 'doc-text',
+                'description' => t('Open Application Log'),
+                'label'       => t('Application Log'),
+                'url'         => 'list/applicationlog',
+                'permission'  => 'application/log',
+                'priority'    => 900
+            ]));
+        }
+    }
+}
diff --git a/library/Icinga/Web/Navigation/ConfigMenu.php b/library/Icinga/Web/Navigation/ConfigMenu.php
new file mode 100644
index 0000000..583bf42
--- /dev/null
+++ b/library/Icinga/Web/Navigation/ConfigMenu.php
@@ -0,0 +1,327 @@
+<?php
+/* Icinga Web 2 | (c) 2022 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Navigation;
+
+use Icinga\Application\Hook\HealthHook;
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Application\MigrationManager;
+use Icinga\Authentication\Auth;
+use Icinga\Web\Navigation\Renderer\BadgeNavigationItemRenderer;
+use ipl\Html\Attributes;
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Web\Url;
+use ipl\Web\Widget\Icon;
+use ipl\Web\Widget\StateBadge;
+use Throwable;
+
+class ConfigMenu extends BaseHtmlElement
+{
+    const STATE_OK = 'ok';
+    const STATE_CRITICAL = 'critical';
+    const STATE_WARNING = 'warning';
+    const STATE_PENDING = 'pending';
+    const STATE_UNKNOWN = 'unknown';
+
+    protected $tag = 'ul';
+
+    protected $defaultAttributes = ['class' => 'nav'];
+
+    protected $children;
+
+    protected $selected;
+
+    protected $state;
+
+    public function __construct()
+    {
+        $this->children = [
+            'system' => [
+                'title' => t('System'),
+                'items' => [
+                    'about' => [
+                        'label' => t('About'),
+                        'url' => 'about'
+                    ],
+                    'health' => [
+                        'label' => t('Health'),
+                        'url' => 'health',
+                    ],
+                    'migrations' => [
+                        'label' => t('Migrations'),
+                        'url' => 'migrations',
+                    ],
+                    'announcements' => [
+                        'label' => t('Announcements'),
+                        'url' => 'announcements'
+                    ],
+                    'sessions' => [
+                        'label' => t('User Sessions'),
+                        'permission' => 'application/sessions',
+                        'url' => 'manage-user-devices'
+                    ]
+                ]
+            ],
+            'configuration' => [
+                'title' => t('Configuration'),
+                'permission' => 'config/*',
+                'items' => [
+                    'application' => [
+                        'label' => t('Application'),
+                        'url' => 'config/general'
+                    ],
+                    'authentication' => [
+                        'label' => t('Access Control'),
+                        'permission'  => 'config/access-control/*',
+                        'url' => 'role/list'
+                    ],
+                    'navigation' => [
+                        'label' => t('Shared Navigation'),
+                        'permission'  => 'config/navigation',
+                        'url' => 'navigation/shared'
+                    ],
+                    'modules' => [
+                        'label' => t('Modules'),
+                        'permission'  => 'config/modules',
+                        'url' => 'config/modules'
+                    ]
+                ]
+            ],
+            'logout' => [
+                'items' => [
+                    'logout' => [
+                        'label' => t('Logout'),
+                        'atts'  => [
+                            'target' => '_self',
+                            'class' => 'nav-item-logout'
+                        ],
+                        'url'         => 'authentication/logout'
+                    ]
+                ]
+            ]
+        ];
+
+        if (Logger::writesToFile()) {
+            $this->children['system']['items']['application_log'] = [
+                'label'       => t('Application Log'),
+                'url'         => 'list/applicationlog',
+                'permission'  => 'application/log'
+            ];
+        }
+    }
+
+    protected function assembleUserMenuItem(BaseHtmlElement $userMenuItem)
+    {
+        $username = Auth::getInstance()->getUser()->getUsername();
+
+        $userMenuItem->add(
+            new HtmlElement(
+                'a',
+                Attributes::create(['href' => Url::fromPath('account')]),
+                new HtmlElement(
+                    'i',
+                    Attributes::create(['class' => 'user-ball']),
+                    Text::create($username[0])
+                ),
+                Text::create($username)
+            )
+        );
+
+        if (Icinga::app()->getRequest()->getUrl()->matches('account')) {
+            $userMenuItem->addAttributes(['class' => 'selected active']);
+        }
+    }
+
+    protected function assembleCogMenuItem($cogMenuItem)
+    {
+        $cogMenuItem->add([
+            HtmlElement::create(
+                'button',
+                null,
+                [
+                    new Icon('cog'),
+                    $this->createHealthBadge() ?? $this->createMigrationBadge(),
+                ]
+            ),
+            $this->createLevel2Menu()
+        ]);
+    }
+
+    protected function assembleLevel2Nav(BaseHtmlElement $level2Nav)
+    {
+        $navContent = HtmlElement::create('div', ['class' => 'flyout-content']);
+        foreach ($this->children as $c) {
+            if (isset($c['permission']) && ! Auth::getInstance()->hasPermission($c['permission'])) {
+                continue;
+            }
+
+            if (isset($c['title'])) {
+                $navContent->add(HtmlElement::create(
+                    'h3',
+                    null,
+                    $c['title']
+                ));
+            }
+
+            $ul = HtmlElement::create('ul', ['class' => 'nav']);
+            foreach ($c['items'] as $key => $item) {
+                $ul->add($this->createLevel2MenuItem($item, $key));
+            }
+
+            $navContent->add($ul);
+        }
+
+        $level2Nav->add($navContent);
+    }
+
+    protected function getHealthCount()
+    {
+        $count = 0;
+        $worstState = null;
+        foreach (HealthHook::collectHealthData()->select() as $result) {
+            if ($worstState === null || $result->state > $worstState) {
+                $worstState = $result->state;
+                $count = 1;
+            } elseif ($worstState === $result->state) {
+                $count++;
+            }
+        }
+
+        switch ($worstState) {
+            case HealthHook::STATE_OK:
+                $count = 0;
+                break;
+            case HealthHook::STATE_WARNING:
+                $this->state = self::STATE_WARNING;
+                break;
+            case HealthHook::STATE_CRITICAL:
+                $this->state = self::STATE_CRITICAL;
+                break;
+            case HealthHook::STATE_UNKNOWN:
+                $this->state = self::STATE_UNKNOWN;
+                break;
+        }
+
+        return $count;
+    }
+
+    protected function isSelectedItem($item)
+    {
+        if ($item !== null && Icinga::app()->getRequest()->getUrl()->matches($item['url'])) {
+            $this->selected = $item;
+            return true;
+        }
+
+        return false;
+    }
+
+    protected function createHealthBadge(): ?StateBadge
+    {
+        $stateBadge = null;
+        if ($this->getHealthCount() > 0) {
+            $stateBadge = new StateBadge($this->getHealthCount(), $this->state);
+            $stateBadge->addAttributes(['class' => 'disabled']);
+        }
+
+        return $stateBadge;
+    }
+
+    protected function createMigrationBadge(): ?StateBadge
+    {
+        try {
+            $mm = MigrationManager::instance();
+            $count = $mm->count();
+        } catch (Throwable $e) {
+            Logger::error('Failed to load pending migrations: %s', $e);
+            $count = 0;
+        }
+
+        $stateBadge = null;
+        if ($count > 0) {
+            $stateBadge = new StateBadge($count, BadgeNavigationItemRenderer::STATE_PENDING);
+            $stateBadge->addAttributes(['class' => 'disabled']);
+        }
+
+        return $stateBadge;
+    }
+
+    protected function createLevel2Menu()
+    {
+        $level2Nav = HtmlElement::create(
+            'div',
+            Attributes::create(['class' => 'nav-level-1 flyout'])
+        );
+
+        $this->assembleLevel2Nav($level2Nav);
+
+        return $level2Nav;
+    }
+
+    protected function createLevel2MenuItem($item, $key)
+    {
+        if (isset($item['permission']) && ! Auth::getInstance()->hasPermission($item['permission'])) {
+            return null;
+        }
+
+        $stateBadge = null;
+        $class = null;
+        if ($key === 'health') {
+            $class = 'badge-nav-item';
+            $stateBadge = $this->createHealthBadge();
+        } elseif ($key === 'migrations') {
+            $class = 'badge-nav-item';
+            $stateBadge = $this->createMigrationBadge();
+        }
+
+        $li = HtmlElement::create(
+            'li',
+            $item['atts'] ?? [],
+            [
+                HtmlElement::create(
+                    'a',
+                    Attributes::create(['href' => Url::fromPath($item['url'])]),
+                    [
+                        $item['label'],
+                        $stateBadge ?? ''
+                    ]
+                ),
+            ]
+        );
+        $li->addAttributes(['class' => $class]);
+
+        if ($this->isSelectedItem($item)) {
+            $li->addAttributes(['class' => 'selected']);
+        }
+
+        return $li;
+    }
+
+    protected function createUserMenuItem()
+    {
+        $userMenuItem = HtmlElement::create('li', ['class' => 'user-nav-item']);
+
+        $this->assembleUserMenuItem($userMenuItem);
+
+        return $userMenuItem;
+    }
+
+    protected function createCogMenuItem()
+    {
+        $cogMenuItem = HtmlElement::create('li', ['class' => 'config-nav-item']);
+
+        $this->assembleCogMenuItem($cogMenuItem);
+
+        return $cogMenuItem;
+    }
+
+    protected function assemble()
+    {
+        $this->add([
+            $this->createUserMenuItem(),
+            $this->createCogMenuItem()
+        ]);
+    }
+}
diff --git a/library/Icinga/Web/Navigation/DashboardPane.php b/library/Icinga/Web/Navigation/DashboardPane.php
new file mode 100644
index 0000000..71b3215
--- /dev/null
+++ b/library/Icinga/Web/Navigation/DashboardPane.php
@@ -0,0 +1,84 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation;
+
+use Icinga\Web\Url;
+
+/**
+ * A dashboard pane
+ */
+class DashboardPane extends NavigationItem
+{
+    /**
+     * This pane's dashlets
+     *
+     * @var array
+     */
+    protected $dashlets;
+
+    protected $disabled;
+
+    /**
+     * Set this pane's dashlets
+     *
+     * @param   array   $dashlets
+     *
+     * @return  $this
+     */
+    public function setDashlets(array $dashlets)
+    {
+        $this->dashlets = $dashlets;
+        return $this;
+    }
+
+    /**
+     * Return this pane's dashlets
+     *
+     * @param   bool    $ordered    Whether to order the dashlets first
+     *
+     * @return  array
+     */
+    public function getDashlets($ordered = true)
+    {
+        if ($this->dashlets === null) {
+            return array();
+        }
+
+        if ($ordered) {
+            $dashlets = $this->dashlets;
+            ksort($dashlets);
+            return $dashlets;
+        }
+
+        return $this->dashlets;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setUrl(Url::fromPath('dashboard', array('pane' => $this->getName())));
+    }
+
+    /**
+     * Set disabled state for pane
+     *
+     * @param bool $disabled
+     */
+    public function setDisabled($disabled = true)
+    {
+        $this->disabled = (bool) $disabled;
+    }
+
+    /**
+     * Get disabled state for pane
+     *
+     * @return bool
+     */
+    public function getDisabled()
+    {
+        return $this->disabled;
+    }
+}
diff --git a/library/Icinga/Web/Navigation/DropdownItem.php b/library/Icinga/Web/Navigation/DropdownItem.php
new file mode 100644
index 0000000..2342b96
--- /dev/null
+++ b/library/Icinga/Web/Navigation/DropdownItem.php
@@ -0,0 +1,20 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation;
+
+/**
+ * Dropdown navigation item
+ *
+ * @see \Icinga\Web\Navigation\Navigation For a usage example.
+ */
+class DropdownItem extends NavigationItem
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->children->setLayout(Navigation::LAYOUT_DROPDOWN);
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Navigation.php b/library/Icinga/Web/Navigation/Navigation.php
new file mode 100644
index 0000000..4343c3c
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Navigation.php
@@ -0,0 +1,572 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation;
+
+use ArrayAccess;
+use ArrayIterator;
+use Exception;
+use Countable;
+use InvalidArgumentException;
+use IteratorAggregate;
+use Traversable;
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Authentication\Auth;
+use Icinga\Data\ConfigObject;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Exception\IcingaException;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Util\StringHelper;
+use Icinga\Web\Navigation\Renderer\RecursiveNavigationRenderer;
+
+/**
+ * Container for navigation items
+ */
+class Navigation implements ArrayAccess, Countable, IteratorAggregate
+{
+    /**
+     * The class namespace where to locate navigation type classes
+     *
+     * @var string
+     */
+    const NAVIGATION_NS = 'Web\\Navigation';
+
+    /**
+     * Flag for dropdown layout
+     *
+     * @var int
+     */
+    const LAYOUT_DROPDOWN = 1;
+
+    /**
+     * Flag for tabs layout
+     *
+     * @var int
+     */
+    const LAYOUT_TABS = 2;
+
+    /**
+     * Known navigation types
+     *
+     * @var array
+     */
+    protected static $types;
+
+    /**
+     * This navigation's items
+     *
+     * @var NavigationItem[]
+     */
+    protected $items = array();
+
+    /**
+     * This navigation's layout
+     *
+     * @var int
+     */
+    protected $layout;
+
+    public function offsetExists($offset): bool
+    {
+        return isset($this->items[$offset]);
+    }
+
+    public function offsetGet($offset): ?NavigationItem
+    {
+        return $this->items[$offset] ?? null;
+    }
+
+    public function offsetSet($offset, $value): void
+    {
+        $this->items[$offset] = $value;
+    }
+
+    public function offsetUnset($offset): void
+    {
+        unset($this->items[$offset]);
+    }
+
+    public function count(): int
+    {
+        return count($this->items);
+    }
+
+    public function getIterator(): Traversable
+    {
+        $this->order();
+        return new ArrayIterator($this->items);
+    }
+
+    /**
+     * Create and return a new navigation item for the given configuration
+     *
+     * @param   string              $name
+     * @param   array|ConfigObject  $properties
+     *
+     * @return  NavigationItem
+     *
+     * @throws  InvalidArgumentException    If the $properties argument is neither an array nor a ConfigObject
+     */
+    public function createItem($name, $properties)
+    {
+        if ($properties instanceof ConfigObject) {
+            $properties = $properties->toArray();
+        } elseif (! is_array($properties)) {
+            throw new InvalidArgumentException('Argument $properties must be of type array or ConfigObject');
+        }
+
+        $itemType = isset($properties['type']) ? StringHelper::cname($properties['type'], '-') : 'NavigationItem';
+        if (! empty(static::$types) && isset(static::$types[$itemType])) {
+            return new static::$types[$itemType]($name, $properties);
+        }
+
+        $item = null;
+        $classPath = null;
+        foreach (Icinga::app()->getModuleManager()->getLoadedModules() as $module) {
+            $classPath = 'Icinga\\Module\\'
+                . ucfirst($module->getName())
+                . '\\'
+                . static::NAVIGATION_NS
+                . '\\'
+                . $itemType;
+            if (class_exists($classPath)) {
+                $item = new $classPath($name, $properties);
+                break;
+            }
+        }
+
+        if ($item === null) {
+            $classPath = 'Icinga\\' . static::NAVIGATION_NS . '\\' . $itemType;
+            if (class_exists($classPath)) {
+                $item = new $classPath($name, $properties);
+            }
+        }
+
+        if ($item === null) {
+            if ($itemType !== 'MenuItem') {
+                Logger::debug(
+                    'Failed to find custom navigation item class %s for item %s. Using base class NavigationItem now',
+                    $itemType,
+                    $name
+                );
+            }
+
+            $item = new NavigationItem($name, $properties);
+            static::$types[$itemType] = 'Icinga\\Web\\Navigation\\NavigationItem';
+        } elseif (! $item instanceof NavigationItem) {
+            throw new ProgrammingError('Class %s must inherit from NavigationItem', $classPath);
+        } else {
+            static::$types[$itemType] = $classPath;
+        }
+
+        return $item;
+    }
+
+    /**
+     * Add a navigation item
+     *
+     * If you do not pass an instance of NavigationItem, this will only add the item
+     * if it does not require a permission or the current user has the permission.
+     *
+     * @param   string|NavigationItem   $name       The name of the item or an instance of NavigationItem
+     * @param   array                   $properties The properties of the item to add (Ignored if $name is not a string)
+     *
+     * @return  bool                                Whether the item was added or not
+     *
+     * @throws  InvalidArgumentException            In case $name is neither a string nor an instance of NavigationItem
+     */
+    public function addItem($name, array $properties = array())
+    {
+        if (is_string($name)) {
+            if (isset($properties['permission'])) {
+                if (! Auth::getInstance()->hasPermission($properties['permission'])) {
+                    return false;
+                }
+
+                unset($properties['permission']);
+            }
+
+            $item = $this->createItem($name, $properties);
+        } elseif (! $name instanceof NavigationItem) {
+            throw new InvalidArgumentException('Argument $name must be of type string or NavigationItem');
+        } else {
+            $item = $name;
+        }
+
+        $this->items[$item->getName()] = $item;
+        return true;
+    }
+
+    /**
+     * Return the item with the given name
+     *
+     * @param   string  $name
+     * @param   mixed   $default
+     *
+     * @return  NavigationItem|mixed
+     */
+    public function getItem($name, $default = null)
+    {
+        return isset($this->items[$name]) ? $this->items[$name] : $default;
+    }
+
+    /**
+     * Return the currently active item or the first one if none is active
+     *
+     * @return  NavigationItem
+     */
+    public function getActiveItem()
+    {
+        foreach ($this->items as $item) {
+            if ($item->getActive()) {
+                return $item;
+            }
+        }
+
+        $firstItem = reset($this->items);
+        return $firstItem ? $firstItem->setActive() : null;
+    }
+
+    /**
+     * Return this navigation's items
+     *
+     * @return  array
+     */
+    public function getItems()
+    {
+        return $this->items;
+    }
+
+    /**
+     * Return whether this navigation is empty
+     *
+     * @return  bool
+     */
+    public function isEmpty()
+    {
+        return empty($this->items);
+    }
+
+    /**
+     * Return whether this navigation has any renderable items
+     *
+     * @return  bool
+     */
+    public function hasRenderableItems()
+    {
+        foreach ($this->getItems() as $item) {
+            if ($item->shouldRender()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Return this navigation's layout
+     *
+     * @return  int
+     */
+    public function getLayout()
+    {
+        return $this->layout;
+    }
+
+    /**
+     * Set this navigation's layout
+     *
+     * @param   int     $layout
+     *
+     * @return  $this
+     */
+    public function setLayout($layout)
+    {
+        $this->layout = (int) $layout;
+        return $this;
+    }
+
+    /**
+     * Create and return the renderer for this navigation
+     *
+     * @return  RecursiveNavigationRenderer
+     */
+    public function getRenderer()
+    {
+        return new RecursiveNavigationRenderer($this);
+    }
+
+    /**
+     * Return this navigation rendered to HTML
+     *
+     * @return  string
+     */
+    public function render()
+    {
+        return $this->getRenderer()->render();
+    }
+
+    /**
+     * Order this navigation's items
+     *
+     * @return  $this
+     */
+    public function order()
+    {
+        uasort($this->items, array($this, 'compareItems'));
+        foreach ($this->items as $item) {
+            if ($item->hasChildren()) {
+                $item->getChildren()->order();
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether the first item is less than, more than or equal to the second one
+     *
+     * @param   NavigationItem  $a
+     * @param   NavigationItem  $b
+     *
+     * @return  int
+     */
+    protected function compareItems(NavigationItem $a, NavigationItem $b)
+    {
+        if ($a->getPriority() === $b->getPriority()) {
+            return strcasecmp($a->getLabel(), $b->getLabel());
+        }
+
+        return $a->getPriority() > $b->getPriority() ? 1 : -1;
+    }
+
+    /**
+     * Try to find and return a item with the given or a similar name
+     *
+     * @param   string  $name
+     *
+     * @return  ?NavigationItem
+     */
+    public function findItem($name)
+    {
+        $item = $this->getItem($name);
+        if ($item !== null) {
+            return $item;
+        }
+
+        $loweredName = strtolower($name);
+        foreach ($this->getItems() as $item) {
+            if (strtolower($item->getName()) === $loweredName) {
+                return $item;
+            }
+        }
+    }
+
+    /**
+     * Merge this navigation with the given one
+     *
+     * Any duplicate items of this navigation will be overwritten by the given navigation's items.
+     *
+     * @param   Navigation  $navigation
+     *
+     * @return  $this
+     */
+    public function merge(Navigation $navigation)
+    {
+        foreach ($navigation as $item) {
+            /** @var $item NavigationItem */
+            if (($existingItem = $this->findItem($item->getName())) !== null) {
+                if ($existingItem->conflictsWith($item)) {
+                    $name = $item->getName();
+                    do {
+                        if (preg_match('~_(\d+)$~', $name, $matches)) {
+                            $name = preg_replace('~_\d+$~', (int) $matches[1] + 1, $name);
+                        } else {
+                            $name .= '_2';
+                        }
+                    } while ($this->getItem($name) !== null);
+
+                    $this->addItem($item->setName($name));
+                } else {
+                    $existingItem->merge($item);
+                }
+            } else {
+                $this->addItem($item);
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Extend this navigation set with all additional items of the given type
+     *
+     * This will fetch navigation items from the following sources:
+     * * User Shareables
+     * * User Preferences
+     * * Modules
+     * Any existing entry will be overwritten by one that is coming later in order.
+     *
+     * @param   string  $type
+     *
+     * @return  $this
+     */
+    public function load($type)
+    {
+        $user = Auth::getInstance()->getUser();
+        if ($type !== 'dashboard-pane') {
+            // Shareables
+            $this->merge(Icinga::app()->getSharedNavigation($type));
+
+            // User Preferences
+            $this->merge($user->getNavigation($type));
+        }
+
+        // Modules
+        $moduleManager = Icinga::app()->getModuleManager();
+        foreach ($moduleManager->getLoadedModules() as $module) {
+            if ($user->can($moduleManager::MODULE_PERMISSION_NS . $module->getName())) {
+                if ($type === 'menu-item') {
+                    $this->merge($module->getMenu());
+                } elseif ($type === 'dashboard-pane') {
+                    $this->merge($module->getDashboard());
+                }
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return the global navigation item type configuration
+     *
+     * @return  array
+     */
+    public static function getItemTypeConfiguration()
+    {
+        $defaultItemTypes = array(
+            'menu-item' => array(
+                'label'     => t('Menu Entry'),
+                'config'    => 'menu'
+            )/*, // Disabled, until it is able to fully replace the old implementation
+            'dashlet'   => array(
+                'label'     => 'Dashlet',
+                'config'    => 'dashboard'
+            )*/
+        );
+
+        $moduleItemTypes = array();
+        $moduleManager = Icinga::app()->getModuleManager();
+        foreach ($moduleManager->getLoadedModules() as $module) {
+            if (Auth::getInstance()->hasPermission($moduleManager::MODULE_PERMISSION_NS . $module->getName())) {
+                foreach ($module->getNavigationItems() as $type => $options) {
+                    if (! isset($moduleItemTypes[$type])) {
+                        $moduleItemTypes[$type] = $options;
+                    }
+                }
+            }
+        }
+
+        return array_merge($defaultItemTypes, $moduleItemTypes);
+    }
+
+    /**
+     * Create and return a new set of navigation items for the given configuration
+     *
+     * Note that this is supposed to be utilized for one dimensional structures
+     * only. Multi dimensional structures can be processed by fromArray().
+     *
+     * @param   Traversable|array   $config
+     *
+     * @return  Navigation
+     *
+     * @throws  InvalidArgumentException    In case the given configuration is invalid
+     * @throws  ConfigurationError          In case a referenced parent does not exist
+     */
+    public static function fromConfig($config)
+    {
+        if (! is_array($config) && !$config instanceof Traversable) {
+            throw new InvalidArgumentException('Argument $config must be an array or a instance of Traversable');
+        }
+
+        $flattened = $orphans = $topLevel = array();
+        foreach ($config as $sectionName => $sectionConfig) {
+            $parentName = $sectionConfig->parent;
+            unset($sectionConfig->parent);
+
+            if (! $parentName) {
+                $topLevel[$sectionName] = $sectionConfig->toArray();
+                $flattened[$sectionName] = & $topLevel[$sectionName];
+            } elseif (isset($flattened[$parentName])) {
+                $flattened[$parentName]['children'][$sectionName] = $sectionConfig->toArray();
+                $flattened[$sectionName] = & $flattened[$parentName]['children'][$sectionName];
+            } else {
+                $orphans[$parentName][$sectionName] = $sectionConfig->toArray();
+                $flattened[$sectionName] = & $orphans[$parentName][$sectionName];
+            }
+        }
+
+        do {
+            $match = false;
+            foreach ($orphans as $parentName => $children) {
+                if (isset($flattened[$parentName])) {
+                    if (isset($flattened[$parentName]['children'])) {
+                        $flattened[$parentName]['children'] = array_merge(
+                            $flattened[$parentName]['children'],
+                            $children
+                        );
+                    } else {
+                        $flattened[$parentName]['children'] = $children;
+                    }
+
+                    unset($orphans[$parentName]);
+                    $match = true;
+                }
+            }
+        } while ($match && !empty($orphans));
+
+        if (! empty($orphans)) {
+            throw new ConfigurationError(
+                t(
+                    'Failed to fully parse navigation configuration. Ensure that'
+                    . ' all referenced parents are existing navigation items: %s'
+                ),
+                join(', ', array_keys($orphans))
+            );
+        }
+
+        return static::fromArray($topLevel);
+    }
+
+    /**
+     * Create and return a new set of navigation items for the given array
+     *
+     * @param   array   $array
+     *
+     * @return  Navigation
+     */
+    public static function fromArray(array $array)
+    {
+        $navigation = new static();
+        foreach ($array as $name => $properties) {
+            $navigation->addItem((string) $name, $properties);
+        }
+
+        return $navigation;
+    }
+
+    /**
+     * Return this navigation rendered to HTML
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            return IcingaException::describe($e);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Navigation/NavigationItem.php b/library/Icinga/Web/Navigation/NavigationItem.php
new file mode 100644
index 0000000..8aaf7b8
--- /dev/null
+++ b/library/Icinga/Web/Navigation/NavigationItem.php
@@ -0,0 +1,948 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation;
+
+use Exception;
+use Icinga\Authentication\Auth;
+use InvalidArgumentException;
+use IteratorAggregate;
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Exception\IcingaException;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Navigation\Renderer\NavigationItemRenderer;
+use Icinga\Web\Url;
+use Traversable;
+
+/**
+ * A navigation item
+ */
+class NavigationItem implements IteratorAggregate
+{
+    /**
+     * Alternative markup element for items without a url
+     *
+     * @var string
+     */
+    const LINK_ALTERNATIVE = 'span';
+
+    /**
+     * The class namespace where to locate navigation type renderer classes
+     */
+    const RENDERER_NS = 'Web\\Navigation\\Renderer';
+
+    /**
+     * Whether this item is active
+     *
+     * @var bool
+     */
+    protected $active;
+
+    /**
+     * Whether this item is selected
+     *
+     * @var bool
+     */
+    protected $selected;
+
+    /**
+     * The CSS class used for the outer li element
+     *
+     * @var string
+     */
+    protected $cssClass;
+
+    /**
+     * This item's priority
+     *
+     * The priority defines when the item is rendered in relation to its parent's childs.
+     *
+     * @var int
+     */
+    protected $priority;
+
+    /**
+     * The attributes of this item's element
+     *
+     * @var array
+     */
+    protected $attributes;
+
+    /**
+     * This item's children
+     *
+     * @var Navigation
+     */
+    protected $children;
+
+    /**
+     * This item's icon
+     *
+     * @var string
+     */
+    protected $icon;
+
+    /**
+     * This item's name
+     *
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * This item's label
+     *
+     * @var string
+     */
+    protected $label;
+
+    /**
+     * The item's description
+     *
+     * @var string
+     */
+    protected $description;
+
+    /**
+     * This item's parent
+     *
+     * @var NavigationItem
+     */
+    protected $parent;
+
+    /**
+     * This item's url
+     *
+     * @var Url
+     */
+    protected $url;
+
+    /**
+     * This item's url target
+     *
+     * @var string
+     */
+    protected $target;
+
+    /**
+     * Additional parameters for this item's url
+     *
+     * @var array
+     */
+    protected $urlParameters;
+
+    /**
+     * This item's renderer
+     *
+     * @var NavigationItemRenderer
+     */
+    protected $renderer;
+
+    /**
+     * Whether to render this item
+     *
+     * @var bool
+     */
+    protected $render;
+
+    /**
+     * Create a new NavigationItem
+     *
+     * @param   string  $name
+     * @param   array   $properties
+     */
+    public function __construct($name, array $properties = null)
+    {
+        $this->setName($name);
+        $this->children = new Navigation();
+
+        if (! empty($properties)) {
+            $this->setProperties($properties);
+        }
+
+        $this->init();
+    }
+
+    /**
+     * Initialize this NavigationItem
+     */
+    public function init()
+    {
+    }
+
+    /**
+     * @return Navigation
+     */
+    public function getIterator(): Traversable
+    {
+        return $this->getChildren();
+    }
+
+    /**
+     * Return whether this item is active
+     *
+     * @return  bool
+     */
+    public function getActive()
+    {
+        if ($this->active === null) {
+            $this->active = false;
+            if ($this->getUrl() !== null && Icinga::app()->getRequest()->getUrl()->matches($this->getUrl())) {
+                $this->setActive();
+            } elseif ($this->hasChildren()) {
+                foreach ($this->getChildren() as $item) {
+                    /** @var NavigationItem $item */
+                    if ($item->getActive()) {
+                        // Do nothing, a true active state is automatically passed to all parents
+                    }
+                }
+            }
+        }
+
+        return $this->active;
+    }
+
+    /**
+     * Set whether this item is active
+     *
+     * If it's active and has a parent, the parent gets activated as well.
+     *
+     * @param   bool    $active
+     *
+     * @return  $this
+     */
+    public function setActive($active = true)
+    {
+        $this->active = (bool) $active;
+        if ($this->active && $this->getParent() !== null) {
+            $this->getParent()->setActive();
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether this item is selected
+     *
+     * @return  bool
+     */
+    public function getSelected()
+    {
+        if ($this->selected === null) {
+            $this->active = false;
+            if ($this->getUrl() !== null && Icinga::app()->getRequest()->getUrl()->matches($this->getUrl())) {
+                $this->setSelected();
+            }
+        }
+
+        return $this->selected;
+    }
+
+    /**
+     * Set whether this item is active
+     *
+     * If it's active and has a parent, the parent gets activated as well.
+     *
+     * @param   bool    $selected
+     *
+     * @return  $this
+     */
+    public function setSelected($selected = true)
+    {
+        $this->selected = (bool) $selected;
+
+        return $this;
+    }
+
+    /**
+     * Get the CSS class used for the outer li element
+     *
+     * @return  string
+     */
+    public function getCssClass()
+    {
+        return $this->cssClass;
+    }
+
+    /**
+     * Set the CSS class to use for the outer li element
+     *
+     * @param   string  $class
+     *
+     * @return  $this
+     */
+    public function setCssClass($class)
+    {
+        $this->cssClass = (string) $class;
+        return $this;
+    }
+
+    /**
+     * Return this item's priority
+     *
+     * @return  int
+     */
+    public function getPriority()
+    {
+        return $this->priority !== null ? $this->priority : 100;
+    }
+
+    /**
+     * Set this item's priority
+     *
+     * @param   int     $priority
+     *
+     * @return  $this
+     */
+    public function setPriority($priority)
+    {
+        $this->priority = (int) $priority;
+        return $this;
+    }
+
+    /**
+     * Return the value of the given element attribute
+     *
+     * @param   string  $name
+     * @param   mixed   $default
+     *
+     * @return  mixed
+     */
+    public function getAttribute($name, $default = null)
+    {
+        $attributes = $this->getAttributes();
+        return array_key_exists($name, $attributes) ? $attributes[$name] : $default;
+    }
+
+    /**
+     * Set the value of the given element attribute
+     *
+     * @param   string  $name
+     * @param   mixed   $value
+     *
+     * @return  $this
+     */
+    public function setAttribute($name, $value)
+    {
+        $this->attributes[$name] = $value;
+        return $this;
+    }
+
+    /**
+     * Return the attributes of this item's element
+     *
+     * @return  array
+     */
+    public function getAttributes()
+    {
+        return $this->attributes ?: array();
+    }
+
+    /**
+     * Set the attributes of this item's element
+     *
+     * @param   array   $attributes
+     *
+     * @return  $this
+     */
+    public function setAttributes(array $attributes)
+    {
+        $this->attributes = $attributes;
+        return $this;
+    }
+
+    /**
+     * Add a child to this item
+     *
+     * If the child is active this item gets activated as well.
+     *
+     * @param   NavigationItem  $child
+     *
+     * @return  $this
+     */
+    public function addChild(NavigationItem $child)
+    {
+        $this->getChildren()->addItem($child->setParent($this));
+        if ($child->getActive()) {
+            $this->setActive();
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return this item's children
+     *
+     * @return  Navigation
+     */
+    public function getChildren()
+    {
+        return $this->children;
+    }
+
+    /**
+     * Return whether this item has any children
+     *
+     * @return  bool
+     */
+    public function hasChildren()
+    {
+        return ! $this->getChildren()->isEmpty();
+    }
+
+    /**
+     * Set this item's children
+     *
+     * @param   array|Navigation  $children
+     *
+     * @return  $this
+     */
+    public function setChildren($children)
+    {
+        if (is_array($children)) {
+            $children = Navigation::fromArray($children);
+        } elseif (! $children instanceof Navigation) {
+            throw new InvalidArgumentException('Argument $children must be of type array or Navigation');
+        }
+
+        foreach ($children as $item) {
+            $item->setParent($this);
+        }
+
+        $this->children = $children;
+        return $this;
+    }
+
+    /**
+     * Return this item's icon
+     *
+     * @return  string
+     */
+    public function getIcon()
+    {
+        return $this->icon;
+    }
+
+    /**
+     * Set this item's icon
+     *
+     * @param   string  $icon
+     *
+     * @return  $this
+     */
+    public function setIcon($icon)
+    {
+        $this->icon = $icon;
+        return $this;
+    }
+
+    /**
+     * Return this item's name escaped with only ASCII chars and/or digits
+     *
+     * @return  string
+     */
+    protected function getEscapedName()
+    {
+        return preg_replace('~[^a-zA-Z0-9]~', '_', $this->getName());
+    }
+
+    /**
+     * Return a unique version of this item's name
+     *
+     * @return  string
+     */
+    public function getUniqueName()
+    {
+        if ($this->getParent() === null) {
+            return 'navigation-' . $this->getEscapedName();
+        }
+
+        return $this->getParent()->getUniqueName() . '-' . $this->getEscapedName();
+    }
+
+    /**
+     * Return this item's name
+     *
+     * @return  string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Set this item's name
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+        return $this;
+    }
+
+    /**
+     * Set this item's parent
+     *
+     * @param   NavigationItem  $parent
+     *
+     * @return  $this
+     */
+    public function setParent(NavigationItem $parent)
+    {
+        $this->parent = $parent;
+        return $this;
+    }
+
+    /**
+     * Return this item's parent
+     *
+     * @return  NavigationItem
+     */
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    /**
+     * Return this item's label
+     *
+     * @return  string
+     */
+    public function getLabel()
+    {
+        return $this->label !== null ? $this->label : $this->getName();
+    }
+
+    /**
+     * Set this item's label
+     *
+     * @param   string  $label
+     *
+     * @return  $this
+     */
+    public function setLabel($label)
+    {
+        $this->label = $label;
+        return $this;
+    }
+
+    /**
+     * Get the item's description
+     *
+     * @return  string
+     */
+    public function getDescription()
+    {
+        return $this->description;
+    }
+
+    /**
+     * Set the item's description
+     *
+     * @param   string  $description
+     *
+     * @return  $this
+     */
+    public function setDescription($description)
+    {
+        $this->description = $description;
+
+        return $this;
+    }
+
+    /**
+     * Set this item's url target
+     *
+     * @param   string  $target
+     *
+     * @return  $this
+     */
+    public function setTarget($target)
+    {
+        $this->target = $target;
+        return $this;
+    }
+
+    /**
+     * Return this item's url target
+     *
+     * @return  string
+     */
+    public function getTarget()
+    {
+        return $this->target;
+    }
+
+    /**
+     * Return this item's url
+     *
+     * @return  Url
+     */
+    public function getUrl()
+    {
+        if ($this->url === null && $this->hasChildren()) {
+            $this->setUrl(Url::fromPath('navigation/dashboard', array('name' => strtolower($this->getName()))));
+        }
+
+        return $this->url;
+    }
+
+    /**
+     * Set this item's url
+     *
+     * @param   Url|string  $url
+     *
+     * @return  $this
+     *
+     * @throws  InvalidArgumentException    If the given url is neither of type
+     */
+    public function setUrl($url)
+    {
+        if (is_string($url)) {
+            $url = Url::fromPath($this->resolveMacros($url));
+        } elseif ($url instanceof Url) {
+            $url = Url::fromPath($this->resolveMacros($url->getAbsoluteUrl()));
+        } else {
+            throw new InvalidArgumentException('Argument $url must be of type string or Url');
+        }
+
+        $this->url = $url;
+
+        return $this;
+    }
+
+    /**
+     * Return the value of the given url parameter
+     *
+     * @param   string  $name
+     * @param   mixed   $default
+     *
+     * @return  mixed
+     */
+    public function getUrlParameter($name, $default = null)
+    {
+        $parameters = $this->getUrlParameters();
+        return isset($parameters[$name]) ? $parameters[$name] : $default;
+    }
+
+    /**
+     * Set the value of the given url parameter
+     *
+     * @param   string  $name
+     * @param   mixed   $value
+     *
+     * @return  $this
+     */
+    public function setUrlParameter($name, $value)
+    {
+        $this->urlParameters[$name] = $value;
+        return $this;
+    }
+
+    /**
+     * Return all additional parameters for this item's url
+     *
+     * @return  array
+     */
+    public function getUrlParameters()
+    {
+        return $this->urlParameters ?: array();
+    }
+
+    /**
+     * Set additional parameters for this item's url
+     *
+     * @param   array   $urlParameters
+     *
+     * @return  $this
+     */
+    public function setUrlParameters(array $urlParameters)
+    {
+        $this->urlParameters = $urlParameters;
+        return $this;
+    }
+
+    /**
+     * Set this item's properties
+     *
+     * Unknown properties (no matching setter) are considered as element attributes.
+     *
+     * @param   array   $properties
+     *
+     * @return  $this
+     */
+    public function setProperties(array $properties)
+    {
+        foreach ($properties as $name => $value) {
+            $setter = 'set' . ucfirst($name);
+            if (method_exists($this, $setter)) {
+                $this->$setter($value);
+            } else {
+                $this->setAttribute($name, $value);
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Merge this item with the given one
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  $this
+     */
+    public function merge(NavigationItem $item)
+    {
+        if ($this->conflictsWith($item)) {
+            throw new ProgrammingError('Cannot merge, conflict detected.');
+        }
+
+        if ($this->priority === null) {
+            $priority = $item->getPriority();
+            if ($priority !== 100) {
+                $this->setPriority($priority);
+            }
+        }
+
+        if (! $this->getIcon()) {
+            $this->setIcon($item->getIcon());
+        }
+
+        if ($this->getLabel() === $this->getName() && $item->getLabel() !== $item->getName()) {
+            $this->setLabel($item->getLabel());
+        }
+
+        if ($this->target === null && ($target = $item->getTarget()) !== null) {
+            $this->setTarget($target);
+        }
+
+        if ($this->renderer === null) {
+            $renderer = $item->getRenderer();
+            if (get_class($renderer) !== 'NavigationItemRenderer') {
+                $this->setRenderer($renderer);
+            }
+        }
+
+        foreach ($item->getAttributes() as $name => $value) {
+            $this->setAttribute($name, $value);
+        }
+
+        foreach ($item->getUrlParameters() as $name => $value) {
+            $this->setUrlParameter($name, $value);
+        }
+
+        if ($item->hasChildren()) {
+            $this->getChildren()->merge($item->getChildren());
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return whether it's possible to merge this item with the given one
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  bool
+     */
+    public function conflictsWith(NavigationItem $item)
+    {
+        if (! $item instanceof $this) {
+            return true;
+        }
+
+        if ($this->getUrl() === null || $item->getUrl() === null) {
+            return false;
+        }
+
+        return !$this->getUrl()->matches($item->getUrl());
+    }
+
+    /**
+     * Create and return the given renderer
+     *
+     * @param   string|array    $name
+     *
+     * @return  NavigationItemRenderer
+     */
+    protected function createRenderer($name)
+    {
+        if (is_array($name)) {
+            $options = array_splice($name, 1);
+            $name = $name[0];
+        } else {
+            $options = array();
+        }
+
+        $renderer = null;
+        $classPath = null;
+        foreach (Icinga::app()->getModuleManager()->getLoadedModules() as $module) {
+            $classPath = 'Icinga\\Module\\' . ucfirst($module->getName()) . '\\' . static::RENDERER_NS . '\\' . $name;
+            if (class_exists($classPath)) {
+                $renderer = new $classPath($options);
+                break;
+            }
+        }
+
+        if ($renderer === null) {
+            $classPath = 'Icinga\\' . static::RENDERER_NS . '\\' . $name;
+            if (class_exists($classPath)) {
+                $renderer = new $classPath($options);
+            }
+        }
+
+        if ($renderer === null) {
+            throw new ProgrammingError(
+                'Cannot find renderer "%s" for navigation item "%s"',
+                $name,
+                $this->getName()
+            );
+        } elseif (! $renderer instanceof NavigationItemRenderer) {
+            throw new ProgrammingError('Class %s must inherit from NavigationItemRenderer', $classPath);
+        }
+
+        return $renderer;
+    }
+
+    /**
+     * Set this item's renderer
+     *
+     * @param   string|array|NavigationItemRenderer     $renderer
+     *
+     * @return  $this
+     *
+     * @throws  InvalidArgumentException    If the $renderer argument is neither a string nor a NavigationItemRenderer
+     */
+    public function setRenderer($renderer)
+    {
+        if (is_string($renderer) || is_array($renderer)) {
+            $renderer = $this->createRenderer($renderer);
+        } elseif (! $renderer instanceof NavigationItemRenderer) {
+            throw new InvalidArgumentException(
+                'Argument $renderer must be of type string, array or NavigationItemRenderer'
+            );
+        }
+
+        $this->renderer = $renderer;
+        return $this;
+    }
+
+    /**
+     * Return this item's renderer
+     *
+     * @return  NavigationItemRenderer
+     */
+    public function getRenderer()
+    {
+        if ($this->renderer === null) {
+            $this->setRenderer('NavigationItemRenderer');
+        }
+
+        return $this->renderer;
+    }
+
+    /**
+     * Set whether this item should be rendered
+     *
+     * @param   bool    $state
+     *
+     * @return  $this
+     */
+    public function setRender($state = true)
+    {
+        $this->render = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return whether this item should be rendered
+     *
+     * @return  bool
+     */
+    public function getRender()
+    {
+        if ($this->render === null) {
+            return $this->getUrl() !== null;
+        }
+
+        return $this->render;
+    }
+
+    /**
+     * Return whether this item should be rendered
+     *
+     * Alias for NavigationItem::getRender().
+     *
+     * @return  bool
+     */
+    public function shouldRender()
+    {
+        return $this->getRender();
+    }
+
+    /**
+     * Return this item rendered to HTML
+     *
+     * @return  string
+     */
+    public function render()
+    {
+        try {
+            return $this->getRenderer()->setItem($this)->render();
+        } catch (Exception $e) {
+            Logger::error(
+                'Could not invoke custom navigation item renderer. %s in %s:%d with message: %s',
+                get_class($e),
+                $e->getFile(),
+                $e->getLine(),
+                $e->getMessage()
+            );
+
+            $renderer = new NavigationItemRenderer();
+            return $renderer->render($this);
+        }
+    }
+
+    /**
+     * Return this item rendered to HTML
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            return IcingaException::describe($e);
+        }
+    }
+
+    /**
+     * Resolve all macros in the given URL
+     *
+     * @param string $url
+     *
+     * @return  string
+     */
+    protected function resolveMacros($url)
+    {
+        if (strpos($url, '$') === false) {
+            return $url;
+        }
+
+        $macros = [];
+        if (Auth::getInstance()->isAuthenticated()) {
+            $macros['$user.local_name$'] = Auth::getInstance()->getUser()->getLocalUsername();
+        }
+        if (! empty($macros)) {
+            $url = str_replace(array_keys($macros), array_values($macros), $url);
+        }
+
+        return $url;
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/BadgeNavigationItemRenderer.php b/library/Icinga/Web/Navigation/Renderer/BadgeNavigationItemRenderer.php
new file mode 100644
index 0000000..8510f70
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/BadgeNavigationItemRenderer.php
@@ -0,0 +1,139 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+use Icinga\Web\Navigation\NavigationItem;
+
+/**
+ * Abstract base class for a NavigationItem with a status badge
+ */
+abstract class BadgeNavigationItemRenderer extends NavigationItemRenderer
+{
+    const STATE_OK = 'ok';
+    const STATE_CRITICAL = 'critical';
+    const STATE_WARNING = 'warning';
+    const STATE_PENDING = 'pending';
+    const STATE_UNKNOWN = 'unknown';
+
+    /**
+     * The tooltip text for the badge
+     *
+     * @var string
+     */
+    protected $title;
+
+    /**
+     * The state identifier being used
+     *
+     * The state identifier defines the background color of the badge.
+     *
+     * @var string
+     */
+    protected $state;
+
+    /**
+     * Set the tooltip text for the badge
+     *
+     * @param   string  $title
+     *
+     * @return  $this
+     */
+    public function setTitle($title)
+    {
+        $this->title = $title;
+        return $this;
+    }
+
+    /**
+     * Return the tooltip text for the badge
+     *
+     * @return  string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * Set the state identifier to use
+     *
+     * @param   string  $state
+     *
+     * @return  $this
+     */
+    public function setState($state)
+    {
+        $this->state = $state;
+        return $this;
+    }
+
+    /**
+     * Return the state identifier to use
+     *
+     * @return  string
+     */
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    /**
+     * Return the amount of items represented by the badge
+     *
+     * @return  int
+     */
+    abstract public function getCount();
+
+    /**
+     * Render the given navigation item as HTML anchor with a badge
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  string
+     */
+    public function render(NavigationItem $item = null)
+    {
+        if ($item === null) {
+            $item = $this->getItem();
+        }
+
+        $cssClass = '';
+        if ($item->getCssClass() !== null) {
+            $cssClass = ' ' . $item->getCssClass();
+        }
+
+        $item->setCssClass('badge-nav-item' . $cssClass);
+        $this->setEscapeLabel(false);
+        $label = $this->view()->escape($item->getLabel());
+        $item->setLabel($this->renderBadge() . $label);
+        $html = parent::render($item);
+        return $html;
+    }
+
+    /**
+     * Render the badge
+     *
+     * @return  string
+     */
+    protected function renderBadge()
+    {
+        if ($count = $this->getCount()) {
+            if ($count > 1000000) {
+                $count = round($count, -6) / 1000000 . 'M';
+            } elseif ($count > 1000) {
+                $count = round($count, -3) / 1000 . 'k';
+            }
+
+            $view = $this->view();
+            return sprintf(
+                '<span title="%s" class="badge state-%s">%s</span>',
+                $view->escape($this->getTitle()),
+                $view->escape($this->getState()),
+                $count
+            );
+        }
+
+        return '';
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/HealthNavigationRenderer.php b/library/Icinga/Web/Navigation/Renderer/HealthNavigationRenderer.php
new file mode 100644
index 0000000..577895b
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/HealthNavigationRenderer.php
@@ -0,0 +1,44 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+use Icinga\Application\Hook\HealthHook;
+
+class HealthNavigationRenderer extends BadgeNavigationItemRenderer
+{
+    public function getCount()
+    {
+        $count = 0;
+        $title = null;
+        $worstState = null;
+        foreach (HealthHook::collectHealthData()->select() as $result) {
+            if ($worstState === null || $result->state > $worstState) {
+                $worstState = $result->state;
+                $title = $result->message;
+                $count = 1;
+            } elseif ($worstState === $result->state) {
+                $count++;
+            }
+        }
+
+        switch ($worstState) {
+            case HealthHook::STATE_OK:
+                $count = 0;
+                break;
+            case HealthHook::STATE_WARNING:
+                $this->state = self::STATE_WARNING;
+                break;
+            case HealthHook::STATE_CRITICAL:
+                $this->state = self::STATE_CRITICAL;
+                break;
+            case HealthHook::STATE_UNKNOWN:
+                $this->state = self::STATE_UNKNOWN;
+                break;
+        }
+
+        $this->title = $title;
+
+        return $count;
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/NavigationItemRenderer.php b/library/Icinga/Web/Navigation/Renderer/NavigationItemRenderer.php
new file mode 100644
index 0000000..51136ff
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/NavigationItemRenderer.php
@@ -0,0 +1,235 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+use Icinga\Application\Icinga;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Util\StringHelper;
+use Icinga\Web\Navigation\NavigationItem;
+use Icinga\Web\Url;
+use Icinga\Web\View;
+
+/**
+ * NavigationItemRenderer
+ */
+class NavigationItemRenderer
+{
+    /**
+     * View
+     *
+     * @var View
+     */
+    protected $view;
+
+    /**
+     * The item being rendered
+     *
+     * @var NavigationItem
+     */
+    protected $item;
+
+    /**
+     * Internal link targets provided by Icinga Web 2
+     *
+     * @var array
+     */
+    protected $internalLinkTargets;
+
+    /**
+     * Whether to escape the label
+     *
+     * @var bool
+     */
+    protected $escapeLabel;
+
+    /**
+     * Create a new NavigationItemRenderer
+     *
+     * @param   array   $options
+     */
+    public function __construct(array $options = null)
+    {
+        if (! empty($options)) {
+            $this->setOptions($options);
+        }
+
+        $this->internalLinkTargets = array('_main', '_self', '_next');
+        $this->init();
+    }
+
+    /**
+     * Initialize this renderer
+     */
+    public function init()
+    {
+    }
+
+    /**
+     * Set the given options
+     *
+     * @param   array   $options
+     *
+     * @return  $this
+     */
+    public function setOptions(array $options)
+    {
+        foreach ($options as $name => $value) {
+            $setter = 'set' . StringHelper::cname($name);
+            if (method_exists($this, $setter)) {
+                $this->$setter($value);
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set the view
+     *
+     * @param   View    $view
+     *
+     * @return  $this
+     */
+    public function setView(View $view)
+    {
+        $this->view = $view;
+        return $this;
+    }
+
+    /**
+     * Return the view
+     *
+     * @return  View
+     */
+    public function view()
+    {
+        if ($this->view === null) {
+            $this->setView(Icinga::app()->getViewRenderer()->view);
+        }
+
+        return $this->view;
+    }
+
+    /**
+     * Set the navigation item to render
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  $this
+     */
+    public function setItem(NavigationItem $item)
+    {
+        $this->item = $item;
+        return $this;
+    }
+
+    /**
+     * Return the navigation item being rendered
+     *
+     * @return  NavigationItem
+     */
+    public function getItem()
+    {
+        return $this->item;
+    }
+
+    /**
+     * Set whether to escape the label
+     *
+     * @param   bool    $state
+     *
+     * @return  $this
+     */
+    public function setEscapeLabel($state = true)
+    {
+        $this->escapeLabel = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return whether to escape the label
+     *
+     * @return  bool
+     */
+    public function getEscapeLabel()
+    {
+        return $this->escapeLabel !== null ? $this->escapeLabel : true;
+    }
+
+    /**
+     * Render the given navigation item as HTML anchor
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  string
+     */
+    public function render(NavigationItem $item = null)
+    {
+        if ($item !== null) {
+            $this->setItem($item);
+        } elseif (($item = $this->getItem()) === null) {
+            throw new ProgrammingError(
+                'Cannot render nothing. Pass the item to render as part'
+                . ' of the call to render() or set it with setItem()'
+            );
+        }
+
+        $label = $this->getEscapeLabel()
+            ? $this->view()->escape($item->getLabel())
+            : $item->getLabel();
+        if (($icon = $item->getIcon()) !== null) {
+            $label = $this->view()->icon($icon) . $label;
+        } elseif ($item->getName()) {
+            $firstLetter = $item->getName()[0];
+            $label = $this->view()->icon('letter', null, ['data-letter' => strtolower($firstLetter)]) . $label;
+        }
+
+        if (($url = $item->getUrl()) !== null) {
+            $url->overwriteParams($item->getUrlParameters());
+
+            $target = $item->getTarget();
+            if ($url->isExternal() && (!$target || in_array($target, $this->internalLinkTargets, true))) {
+                $url = Url::fromPath('iframe', array('url' => $url));
+            }
+
+            $content = sprintf(
+                '<a%s href="%s"%s>%s</a>',
+                $this->view()->propertiesToString($item->getAttributes()),
+                $this->view()->escape($url->getAbsoluteUrl('&')),
+                $this->renderTargetAttribute(),
+                $label
+            );
+        } elseif ($label) {
+            $content = sprintf(
+                '<%1$s%2$s>%3$s</%1$s>',
+                $item::LINK_ALTERNATIVE,
+                $this->view()->propertiesToString($item->getAttributes()),
+                $label
+            );
+        } else {
+            $content = '';
+        }
+
+        return $content;
+    }
+
+    /**
+     * Render and return the attribute to provide a non-default target for the url
+     *
+     * @return  string
+     */
+    protected function renderTargetAttribute()
+    {
+        $target = $this->getItem()->getTarget();
+        if ($target === null || $this->getItem()->getUrl()->getAbsoluteUrl() == '#') {
+            return '';
+        }
+
+        if (! in_array($target, $this->internalLinkTargets, true)) {
+            return ' target="' . $this->view()->escape($target) . '"';
+        }
+
+        return ' data-base-target="' . $target . '"';
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/NavigationRenderer.php b/library/Icinga/Web/Navigation/Renderer/NavigationRenderer.php
new file mode 100644
index 0000000..00c0f9a
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/NavigationRenderer.php
@@ -0,0 +1,356 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+use ArrayIterator;
+use Exception;
+use RecursiveIterator;
+use Icinga\Application\Icinga;
+use Icinga\Exception\IcingaException;
+use Icinga\Web\Navigation\Navigation;
+use Icinga\Web\Navigation\NavigationItem;
+use Icinga\Web\View;
+
+/**
+ * Renderer for single level navigation
+ */
+class NavigationRenderer implements RecursiveIterator, NavigationRendererInterface
+{
+    /**
+     * The tag used for the outer element
+     *
+     * @var string
+     */
+    protected $elementTag;
+
+    /**
+     * The CSS class used for the outer element
+     *
+     * @var string
+     */
+    protected $cssClass;
+
+    /**
+     * The navigation's heading text
+     *
+     * @var string
+     */
+    protected $heading;
+
+    /**
+     * The content rendered so far
+     *
+     * @var array
+     */
+    protected $content;
+
+    /**
+     * Whether to skip rendering the outer element
+     *
+     * @var bool
+     */
+    protected $skipOuterElement;
+
+    /**
+     * The navigation's iterator
+     *
+     * @var ArrayIterator
+     */
+    protected $iterator;
+
+    /**
+     * The navigation
+     *
+     * @var Navigation
+     */
+    protected $navigation;
+
+    /**
+     * View
+     *
+     * @var View
+     */
+    protected $view;
+
+    /**
+     * Create a new NavigationRenderer
+     *
+     * @param   Navigation  $navigation
+     * @param   bool        $skipOuterElement
+     */
+    public function __construct(Navigation $navigation, $skipOuterElement = false)
+    {
+        $this->skipOuterElement = $skipOuterElement;
+        $this->iterator = $navigation->getIterator();
+        $this->navigation = $navigation;
+        $this->content = array();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setElementTag($tag)
+    {
+        $this->elementTag = $tag;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getElementTag()
+    {
+        return $this->elementTag ?: static::OUTER_ELEMENT_TAG;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setCssClass($class)
+    {
+        $this->cssClass = $class;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCssClass()
+    {
+        return $this->cssClass;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setHeading($heading)
+    {
+        $this->heading = $heading;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getHeading()
+    {
+        return $this->heading;
+    }
+
+    /**
+     * Return the view
+     *
+     * @return View
+     */
+    public function view()
+    {
+        if ($this->view === null) {
+            $this->setView(Icinga::app()->getViewRenderer()->view);
+        }
+
+        return $this->view;
+    }
+
+    /**
+     * Set the view
+     *
+     * @param   View    $view
+     *
+     * @return  $this
+     */
+    public function setView(View $view)
+    {
+        $this->view = $view;
+        return $this;
+    }
+
+    public function getChildren(): NavigationRenderer
+    {
+        return new static($this->current()->getChildren(), $this->skipOuterElement);
+    }
+
+    public function hasChildren(): bool
+    {
+        return $this->current()->hasChildren();
+    }
+
+    public function current(): NavigationItem
+    {
+        return $this->iterator->current();
+    }
+
+    public function key(): int
+    {
+        return $this->iterator->key();
+    }
+
+    public function next(): void
+    {
+        $this->iterator->next();
+    }
+
+    public function rewind(): void
+    {
+        $this->iterator->rewind();
+        if (! $this->skipOuterElement) {
+            $this->content[] = $this->beginMarkup();
+        }
+    }
+
+    public function valid(): bool
+    {
+        $valid = $this->iterator->valid();
+        if (! $this->skipOuterElement && !$valid) {
+            $this->content[] = $this->endMarkup();
+        }
+
+        return $valid;
+    }
+
+    /**
+     * Return the opening markup for the navigation
+     *
+     * @return  string
+     */
+    public function beginMarkup()
+    {
+        $content = array();
+        $content[] = sprintf(
+            '<%s%s role="navigation">',
+            $this->getElementTag(),
+            $this->getCssClass() !== null ? ' class="' . $this->getCssClass() . '"' : ''
+        );
+        if (($heading = $this->getHeading()) !== null) {
+            $content[] = sprintf(
+                '<h%1$d id="navigation" class="sr-only" tabindex="-1">%2$s</h%1$d>',
+                static::HEADING_RANK,
+                $this->view()->escape($heading)
+            );
+        }
+        $content[] = $this->beginChildrenMarkup();
+        return join("\n", $content);
+    }
+
+    /**
+     * Return the closing markup for the navigation
+     *
+     * @return  string
+     */
+    public function endMarkup()
+    {
+        $content = array();
+        $content[] = $this->endChildrenMarkup();
+        $content[] = '</' . $this->getElementTag() . '>';
+        return join("\n", $content);
+    }
+
+    /**
+     * Return the opening markup for multiple navigation items
+     *
+     * @param   int $level
+     *
+     * @return  string
+     */
+    public function beginChildrenMarkup($level = 1)
+    {
+        $cssClass = array(static::CSS_CLASS_NAV);
+        if ($this->navigation->getLayout() === Navigation::LAYOUT_TABS) {
+            $cssClass[] = static::CSS_CLASS_NAV_TABS;
+        } elseif ($this->navigation->getLayout() === Navigation::LAYOUT_DROPDOWN) {
+            $cssClass[] = static::CSS_CLASS_NAV_DROPDOWN;
+        }
+
+        $cssClass[] = 'nav-level-' . $level;
+
+        return '<ul class="' . join(' ', $cssClass) . '">';
+    }
+
+    /**
+     * Return the closing markup for multiple navigation items
+     *
+     * @return  string
+     */
+    public function endChildrenMarkup()
+    {
+        return '</ul>';
+    }
+
+    /**
+     * Return the opening markup for the given navigation item
+     *
+     * @param   NavigationItem  $item
+     *
+     * @return  string
+     */
+    public function beginItemMarkup(NavigationItem $item)
+    {
+        $cssClasses = array(static::CSS_CLASS_ITEM);
+
+        if ($item->hasChildren() && $item->getChildren()->getLayout() === Navigation::LAYOUT_DROPDOWN) {
+            $cssClasses[] = static::CSS_CLASS_DROPDOWN;
+            $item
+                ->setAttribute('class', static::CSS_CLASS_DROPDOWN_TOGGLE)
+                ->setIcon(static::DROPDOWN_TOGGLE_ICON)
+                ->setUrl('#');
+        }
+
+        if ($item->getActive()) {
+            $cssClasses[] = static::CSS_CLASS_ACTIVE;
+        }
+
+        if ($item->getSelected()) {
+            $cssClasses[] = static::CSS_CLASS_SELECTED;
+        }
+
+        if ($cssClass = $item->getCssClass()) {
+            $cssClasses[] = $cssClass;
+        }
+
+        $content = sprintf(
+            '<li class="%s">',
+            join(' ', $cssClasses)
+        );
+        return $content;
+    }
+
+    /**
+     * Return the closing markup for a navigation item
+     *
+     * @return  string
+     */
+    public function endItemMarkup()
+    {
+        return '</li>';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render()
+    {
+        foreach ($this as $item) {
+            /** @var NavigationItem $item */
+            if ($item->shouldRender()) {
+                $content = $item->render();
+                $this->content[] = $this->beginItemMarkup($item);
+                $this->content[] = $content;
+                $this->content[] = $this->endItemMarkup();
+            }
+        }
+
+        return join("\n", $this->content);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            return IcingaException::describe($e);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/NavigationRendererInterface.php b/library/Icinga/Web/Navigation/Renderer/NavigationRendererInterface.php
new file mode 100644
index 0000000..4495b73
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/NavigationRendererInterface.php
@@ -0,0 +1,142 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+/**
+ * Interface for navigation renderers
+ */
+interface NavigationRendererInterface
+{
+    /**
+     * CSS class for items
+     *
+     * @var string
+     */
+    const CSS_CLASS_ITEM = 'nav-item';
+
+    /**
+     * CSS class for active items
+     *
+     * @var string
+     */
+    const CSS_CLASS_ACTIVE = 'active';
+
+    /**
+     * CSS class for selected items
+     *
+     * @var string
+     */
+    const CSS_CLASS_SELECTED = 'selected';
+
+    /**
+     * CSS class for dropdown items
+     *
+     * @var string
+     */
+    const CSS_CLASS_DROPDOWN = 'dropdown-nav-item';
+
+    /**
+     * CSS class for a dropdown item's trigger
+     *
+     * @var string
+     */
+    const CSS_CLASS_DROPDOWN_TOGGLE = 'dropdown-toggle';
+
+    /**
+     * CSS class for the ul element
+     *
+     * @var string
+     */
+    const CSS_CLASS_NAV = 'nav';
+
+    /**
+     * CSS class for the ul element with dropdown layout
+     *
+     * @var string
+     */
+    const CSS_CLASS_NAV_DROPDOWN = 'dropdown-nav';
+
+    /**
+     * CSS class for the ul element with tabs layout
+     *
+     * @var string
+     */
+    const CSS_CLASS_NAV_TABS = 'tab-nav';
+
+    /**
+     * Icon for a dropdown item's trigger
+     *
+     * @var string
+     */
+    const DROPDOWN_TOGGLE_ICON = 'menu';
+
+    /**
+     * Default tag for the outer element the navigation will be wrapped with
+     *
+     * @var string
+     */
+    const OUTER_ELEMENT_TAG = 'div';
+
+    /**
+     * The heading's rank
+     *
+     * @var int
+     */
+    const HEADING_RANK = 1;
+
+    /**
+     * Set the tag for the outer element the navigation is wrapped with
+     *
+     * @param   string  $tag
+     *
+     * @return  $this
+     */
+    public function setElementTag($tag);
+
+    /**
+     * Return the tag for the outer element the navigation is wrapped with
+     *
+     * @return  string
+     */
+    public function getElementTag();
+
+    /**
+     * Set the CSS class to use for the outer element
+     *
+     * @param   string  $class
+     *
+     * @return  $this
+     */
+    public function setCssClass($class);
+
+    /**
+     * Get the CSS class used for the outer element
+     *
+     * @return  string
+     */
+    public function getCssClass();
+
+    /**
+     * Set the navigation's heading text
+     *
+     * @param   string  $heading
+     *
+     * @return  $this
+     */
+    public function setHeading($heading);
+
+    /**
+     * Return the navigation's heading text
+     *
+     * @return  string
+     */
+    public function getHeading();
+
+    /**
+     * Return the navigation rendered to HTML
+     *
+     * @return  string
+     */
+    public function render();
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/RecursiveNavigationRenderer.php b/library/Icinga/Web/Navigation/Renderer/RecursiveNavigationRenderer.php
new file mode 100644
index 0000000..315c2aa
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/RecursiveNavigationRenderer.php
@@ -0,0 +1,186 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+use Exception;
+use RecursiveIteratorIterator;
+use Icinga\Exception\IcingaException;
+use Icinga\Web\Navigation\Navigation;
+use Icinga\Web\Navigation\NavigationItem;
+use Icinga\Web\Navigation\Renderer\NavigationItemRenderer;
+
+/**
+ * Renderer for multi level navigation
+ *
+ * @method NavigationRenderer getInnerIterator() {
+ *     {@inheritdoc}
+ * }
+ */
+class RecursiveNavigationRenderer extends RecursiveIteratorIterator implements NavigationRendererInterface
+{
+    /**
+     * The content rendered so far
+     *
+     * @var array
+     */
+    protected $content;
+
+    /**
+     * Whether to use the standard item renderer
+     *
+     * @var bool
+     */
+    protected $useStandardRenderer;
+
+    /**
+     * Create a new RecursiveNavigationRenderer
+     *
+     * @param   Navigation  $navigation
+     */
+    public function __construct(Navigation $navigation)
+    {
+        $this->content = array();
+        parent::__construct(
+            new NavigationRenderer($navigation, true),
+            RecursiveIteratorIterator::SELF_FIRST
+        );
+    }
+
+    /**
+     * Set whether to use the standard navigation item renderer
+     *
+     * @param   bool    $state
+     *
+     * @return  $this
+     */
+    public function setUseStandardItemRenderer($state = true)
+    {
+        $this->useStandardRenderer = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return whether to use the standard navigation item renderer
+     *
+     * @return  bool
+     */
+    public function getUseStandardItemRenderer()
+    {
+        return $this->useStandardRenderer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setElementTag($tag)
+    {
+        $this->getInnerIterator()->setElementTag($tag);
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getElementTag()
+    {
+        return $this->getInnerIterator()->getElementTag();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setCssClass($class)
+    {
+        $this->getInnerIterator()->setCssClass($class);
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCssClass()
+    {
+        return $this->getInnerIterator()->getCssClass();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setHeading($heading)
+    {
+        $this->getInnerIterator()->setHeading($heading);
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getHeading()
+    {
+        return $this->getInnerIterator()->getHeading();
+    }
+
+    public function beginIteration(): void
+    {
+        $this->content[] = $this->getInnerIterator()->beginMarkup();
+    }
+
+    public function endIteration(): void
+    {
+        $this->content[] = $this->getInnerIterator()->endMarkup();
+    }
+
+    public function beginChildren(): void
+    {
+        $this->content[] = $this->getInnerIterator()->beginChildrenMarkup($this->getDepth() + 1);
+    }
+
+    public function endChildren(): void
+    {
+        $this->content[] = $this->getInnerIterator()->endChildrenMarkup();
+        $this->content[] = $this->getInnerIterator()->endItemMarkup();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render()
+    {
+        foreach ($this as $item) {
+            /** @var NavigationItem $item */
+            if ($item->shouldRender()) {
+                if ($this->getDepth() > 0) {
+                    $item->setIcon(null);
+                }
+                if ($this->getUseStandardItemRenderer()) {
+                    $renderer = new NavigationItemRenderer();
+                    $content = $renderer->render($item);
+                } else {
+                    $content = $item->render();
+                }
+                $this->content[] = $this->getInnerIterator()->beginItemMarkup($item);
+
+                $this->content[] = $content;
+
+                if (! $item->hasChildren()) {
+                    $this->content[] = $this->getInnerIterator()->endItemMarkup();
+                }
+            }
+        }
+
+        return join("\n", $this->content);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            return IcingaException::describe($e);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Navigation/Renderer/SummaryNavigationItemRenderer.php b/library/Icinga/Web/Navigation/Renderer/SummaryNavigationItemRenderer.php
new file mode 100644
index 0000000..2916f4e
--- /dev/null
+++ b/library/Icinga/Web/Navigation/Renderer/SummaryNavigationItemRenderer.php
@@ -0,0 +1,72 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Navigation\Renderer;
+
+/**
+ * Badge renderer summing up the worst state of its children
+ */
+class SummaryNavigationItemRenderer extends BadgeNavigationItemRenderer
+{
+    /**
+     * Cached count
+     *
+     * @var int
+     */
+    protected $count;
+
+    /**
+     * State to severity map
+     *
+     * @var array
+     */
+    protected static $stateSeverityMap = array(
+        self::STATE_OK          => 0,
+        self::STATE_PENDING     => 1,
+        self::STATE_UNKNOWN     => 2,
+        self::STATE_WARNING     => 3,
+        self::STATE_CRITICAL    => 4,
+    );
+
+    /**
+     * Severity to state map
+     *
+     * @var array
+     */
+    protected static $severityStateMap = array(
+        self::STATE_OK,
+        self::STATE_PENDING,
+        self::STATE_UNKNOWN,
+        self::STATE_WARNING,
+        self::STATE_CRITICAL
+    );
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCount()
+    {
+        if ($this->count === null) {
+            $countMap = array_fill(0, 5, 0);
+            $maxSeverity = 0;
+            $titles = array();
+            foreach ($this->getItem()->getChildren() as $child) {
+                $renderer = $child->getRenderer();
+                if ($renderer instanceof BadgeNavigationItemRenderer) {
+                    $count = $renderer->getCount();
+                    if ($count) {
+                        $severity = static::$stateSeverityMap[$renderer->getState()];
+                        $countMap[$severity] += $count;
+                        $titles[] = $renderer->getTitle();
+                        $maxSeverity = max($maxSeverity, $severity);
+                    }
+                }
+            }
+            $this->count = $countMap[$maxSeverity];
+            $this->state = static::$severityStateMap[$maxSeverity];
+            $this->title = implode('. ', $titles);
+        }
+
+        return $this->count;
+    }
+}
diff --git a/library/Icinga/Web/Notification.php b/library/Icinga/Web/Notification.php
new file mode 100644
index 0000000..6f33a32
--- /dev/null
+++ b/library/Icinga/Web/Notification.php
@@ -0,0 +1,220 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Exception\ProgrammingError;
+use Icinga\Application\Platform;
+use Icinga\Application\Logger;
+use Icinga\Web\Session;
+
+/**
+ * // @TODO(eL): Use Notification not as Singleton but within request:
+ * <code>
+ * <?php
+ * $request->[getUser()]->notify('some message', Notification::INFO);
+ * </code>
+ */
+class Notification
+{
+    /**
+     * Notification type info
+     *
+     * @var string
+     */
+    const INFO = 'info';
+
+    /**
+     * Notification type error
+     *
+     * @var string
+     */
+    const ERROR = 'error';
+
+    /**
+     * Notification type success
+     *
+     * @var string
+     */
+    const SUCCESS = 'success';
+
+    /**
+     * Notification type warning
+     *
+     * @var string
+     */
+    const WARNING = 'warning';
+
+    /**
+     * Name of the session key for notification messages
+     *
+     * @var string
+     */
+    const SESSION_KEY = 'session';
+
+    /**
+     * Singleton instance
+     *
+     * @var self
+     */
+    protected static $instance;
+
+    /**
+     * Whether the platform is CLI
+     *
+     * @var bool
+     */
+    protected $isCli = false;
+
+    /**
+     * Notification messages
+     *
+     * @var array
+     */
+    protected $messages = array();
+
+    /**
+     * Session
+     *
+     * @var Session
+     */
+    protected $session;
+
+    /**
+     * Create the notification instance
+     */
+    final private function __construct()
+    {
+        if (Platform::isCli()) {
+            $this->isCli = true;
+            return;
+        }
+
+        $this->session = Session::getSession();
+        $messages = $this->session->get(self::SESSION_KEY);
+        if (is_array($messages)) {
+            $this->messages = $messages;
+            $this->session->delete(self::SESSION_KEY);
+            $this->session->write();
+        }
+    }
+
+    /**
+     * Get the Notification instance
+     *
+     * @return Notification
+     */
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
+    /**
+     * Add info notification
+     *
+     * @param string $msg
+     */
+    public static function info($msg)
+    {
+        self::getInstance()->addMessage($msg, self::INFO);
+    }
+
+    /**
+     * Add error notification
+     *
+     * @param string $msg
+     */
+    public static function error($msg)
+    {
+        self::getInstance()->addMessage($msg, self::ERROR);
+    }
+
+    /**
+     * Add success notification
+     *
+     * @param string $msg
+     */
+    public static function success($msg)
+    {
+        self::getInstance()->addMessage($msg, self::SUCCESS);
+    }
+
+    /**
+     * Add warning notification
+     *
+     * @param string $msg
+     */
+    public static function warning($msg)
+    {
+        self::getInstance()->addMessage($msg, self::WARNING);
+    }
+
+    /**
+     * Add a notification message
+     *
+     * @param   string $message
+     * @param   string $type
+     */
+    protected function addMessage($message, $type = self::INFO)
+    {
+        if ($this->isCli) {
+            $msg = sprintf('[%s] %s', $type, $message);
+            switch ($type) {
+                case self::INFO:
+                case self::SUCCESS:
+                    Logger::info($msg);
+                    break;
+                case self::ERROR:
+                    Logger::error($msg);
+                    break;
+                case self::WARNING:
+                    Logger::warning($msg);
+                    break;
+            }
+        } else {
+            $this->messages[] = (object) array(
+                'type'    => $type,
+                'message' => $message,
+            );
+        }
+    }
+
+    /**
+     * Pop the notification messages
+     *
+     * @return array
+     */
+    public function popMessages()
+    {
+        $messages = $this->messages;
+        $this->messages = array();
+        return $messages;
+    }
+
+    /**
+     * Get whether notification messages have been added
+     *
+     * @return bool
+     */
+    public function hasMessages()
+    {
+        return ! empty($this->messages);
+    }
+
+    /**
+     * Destroy the notification instance
+     */
+    final public function __destruct()
+    {
+        if ($this->isCli) {
+            return;
+        }
+        if ($this->hasMessages() && $this->session->get('messages') !== $this->messages) {
+            $this->session->set(self::SESSION_KEY, $this->messages);
+            $this->session->write();
+        }
+    }
+}
diff --git a/library/Icinga/Web/Paginator/Adapter/QueryAdapter.php b/library/Icinga/Web/Paginator/Adapter/QueryAdapter.php
new file mode 100644
index 0000000..6f103e5
--- /dev/null
+++ b/library/Icinga/Web/Paginator/Adapter/QueryAdapter.php
@@ -0,0 +1,84 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Paginator\Adapter;
+
+use Zend_Paginator_Adapter_Interface;
+use Icinga\Data\QueryInterface;
+
+class QueryAdapter implements Zend_Paginator_Adapter_Interface
+{
+    /**
+     * The query being paginated
+     *
+     * @var QueryInterface
+     */
+    protected $query;
+
+    /**
+     * Item count
+     *
+     * @var int
+     */
+    protected $count;
+
+    /**
+     * Create a new QueryAdapter
+     *
+     * @param   QueryInterface  $query      The query to paginate
+     */
+    public function __construct(QueryInterface $query)
+    {
+        $this->setQuery($query);
+    }
+
+    /**
+     * Set the query to paginate
+     *
+     * @param   QueryInterface  $query
+     *
+     * @return  $this
+     */
+    public function setQuery(QueryInterface $query)
+    {
+        $this->query = $query;
+        return $this;
+    }
+
+    /**
+     * Return the query being paginated
+     *
+     * @return  QueryInterface
+     */
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    /**
+     * Fetch and return the rows in the given range of the query result
+     *
+     * @param   int     $offset             Page offset
+     * @param   int     $itemCountPerPage   Number of items per page
+     *
+     * @return  array
+     */
+    public function getItems($offset, $itemCountPerPage)
+    {
+        return $this->query->limit($itemCountPerPage, $offset)->fetchAll();
+    }
+
+    /**
+     * Return the total number of items in the query result
+     *
+     * @return  int
+     */
+    public function count(): int
+    {
+        if ($this->count === null) {
+            $this->count = $this->query->count();
+        }
+
+        return $this->count;
+    }
+}
diff --git a/library/Icinga/Web/Paginator/ScrollingStyle/SlidingWithBorder.php b/library/Icinga/Web/Paginator/ScrollingStyle/SlidingWithBorder.php
new file mode 100644
index 0000000..d9b2ed9
--- /dev/null
+++ b/library/Icinga/Web/Paginator/ScrollingStyle/SlidingWithBorder.php
@@ -0,0 +1,78 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+/**
+ * @see Zend_Paginator_ScrollingStyle_Interface
+ */
+class Icinga_Web_Paginator_ScrollingStyle_SlidingWithBorder implements Zend_Paginator_ScrollingStyle_Interface
+{
+    /**
+     * Returns an array of "local" pages given a page number and range.
+     *
+     * @param  Zend_Paginator $paginator
+     * @param  integer $pageRange (Optional) Page range
+     * @return array
+     */
+    public function getPages(Zend_Paginator $paginator, $pageRange = null)
+    {
+        // This is unused
+        if ($pageRange === null) {
+            $pageRange = $paginator->getPageRange();
+        }
+
+        $pageNumber = $paginator->getCurrentPageNumber();
+        $pageCount = count($paginator);
+        $range = array();
+
+        if ($pageCount < 10) {
+            // Show all pages if we have less than 10.
+
+            for ($i = 1; $i < 10; $i++) {
+                if ($i > $pageCount) {
+                    break;
+                }
+                $range[$i] = $i;
+            }
+        } else {
+            // More than 10 pages:
+
+            foreach (array(1, 2) as $i) {
+                $range[$i] = $i;
+            }
+            if ($pageNumber < 6) {
+                // We are on page 1-5 from
+                for ($i = 1; $i <= 7; $i++) {
+                    $range[$i] = $i;
+                }
+            } else {
+                // Current page > 5
+                $range[] = '...';
+
+                // Less than 5 pages left
+                if (($pageCount - $pageNumber) < 5) {
+                    $start = 5 - ($pageCount - $pageNumber);
+                } else {
+                    $start = 1;
+                }
+
+                for ($i = $pageNumber - $start; $i < ($pageNumber + (4 - $start)); $i++) {
+                    if ($i > $pageCount) {
+                        break;
+                    }
+                    $range[$i] = $i;
+                }
+            }
+            if ($pageNumber < ($pageCount - 2)) {
+                $range[] = '...';
+            }
+
+            foreach (array($pageCount - 1, $pageCount) as $i) {
+                $range[$i] = $i;
+            }
+        }
+        if (empty($range)) {
+            $range[] = 1;
+        }
+        return $range;
+    }
+}
diff --git a/library/Icinga/Web/RememberMe.php b/library/Icinga/Web/RememberMe.php
new file mode 100644
index 0000000..1002396
--- /dev/null
+++ b/library/Icinga/Web/RememberMe.php
@@ -0,0 +1,363 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Config;
+use Icinga\Authentication\Auth;
+use Icinga\Crypt\AesCrypt;
+use Icinga\Common\Database;
+use Icinga\User;
+use ipl\Sql\Expression;
+use ipl\Sql\Select;
+use RuntimeException;
+
+/**
+ * Remember me component
+ *
+ * Retains credentials for 30 days by default in order to stay signed in even after the session is closed.
+ */
+class RememberMe
+{
+    use Database;
+
+    /** @var string Cookie name */
+    const COOKIE = 'icingaweb2-remember-me';
+
+    /** @var string Database table name */
+    const TABLE = 'icingaweb_rememberme';
+
+    /** @var string Encrypted password of the user */
+    protected $encryptedPassword;
+
+    /** @var string */
+    protected $username;
+
+    /** @var AesCrypt Instance for encrypting/decrypting the credentials */
+    protected $aesCrypt;
+
+    /** @var int Timestamp when the remember me cookie expires */
+    protected $expiresAt;
+
+    /**
+     * Get whether staying logged in is possible
+     *
+     * @return bool
+     */
+    public static function isSupported()
+    {
+        $self = new self();
+
+        if (! $self->hasDb()) {
+            return false;
+        }
+
+        try {
+            (new AesCrypt())->getMethod();
+        } catch (RuntimeException $_) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Get whether the remember cookie is set
+     *
+     * @return bool
+     */
+    public static function hasCookie()
+    {
+        return isset($_COOKIE[static::COOKIE]);
+    }
+
+    /**
+     * Remove the database entry if exists and unset the remember me cookie from PHP's `$_COOKIE` superglobal
+     *
+     * @return Cookie The invalidation cookie which has to be sent to client in oder to remove the remember me cookie
+     */
+    public static function forget()
+    {
+        if (self::hasCookie()) {
+            $data = explode('|', $_COOKIE[static::COOKIE]);
+            $iv = base64_decode(array_pop($data));
+            (new self())->remove(bin2hex($iv));
+        }
+
+        unset($_COOKIE[static::COOKIE]);
+
+        return (new Cookie(static::COOKIE))
+            ->setHttpOnly(true)
+            ->forgetMe();
+    }
+
+    /**
+     * Create the remember me component from the remember me cookie
+     *
+     * @return static
+     */
+    public static function fromCookie()
+    {
+        $data = explode('|', $_COOKIE[static::COOKIE]);
+        $iv = base64_decode(array_pop($data));
+
+        $select = (new Select())
+            ->from(static::TABLE)
+            ->columns('*')
+            ->where(['random_iv = ?' => bin2hex($iv)]);
+
+        $rememberMe = new static();
+        $rs = $rememberMe->getDb()->select($select)->fetch();
+
+        if (! $rs) {
+            throw new RuntimeException(sprintf(
+                "No database entry found for IV '%s'",
+                bin2hex($iv)
+            ));
+        }
+
+        $rememberMe->aesCrypt = (new AesCrypt())
+            ->setKey(hex2bin($rs->passphrase))
+            ->setIV($iv);
+
+        if (count($data) > 1) {
+            $rememberMe->aesCrypt->setTag(
+                base64_decode(array_pop($data))
+            );
+        } elseif ($rememberMe->aesCrypt->isAuthenticatedEncryptionRequired()) {
+            throw new RuntimeException(
+                "The given decryption method needs a tag, but is not specified. "
+                . "You have probably updated the PHP version."
+            );
+        }
+
+        $rememberMe->username = $rs->username;
+        $rememberMe->encryptedPassword = $data[0];
+
+        return $rememberMe;
+    }
+
+    /**
+     * Create the remember me component from the given username and password
+     *
+     * @param string $username
+     * @param string $password
+     *
+     * @return static
+     */
+    public static function fromCredentials($username, $password)
+    {
+        $aesCrypt = new AesCrypt();
+        $rememberMe = new static();
+        $rememberMe->encryptedPassword = $aesCrypt->encrypt($password);
+        $rememberMe->username = $username;
+        $rememberMe->aesCrypt = $aesCrypt;
+
+        return $rememberMe;
+    }
+
+    /**
+     * Remove expired remember me information from the database
+     */
+    public static function removeExpired()
+    {
+        $rememberMe = new static();
+        if (! $rememberMe->hasDb()) {
+            return;
+        }
+
+        $rememberMe->getDb()->delete(static::TABLE, [
+            'expires_at < NOW()'
+        ]);
+    }
+
+    /**
+     * Get the remember me cookie
+     *
+     * @return Cookie
+     */
+    public function getCookie()
+    {
+        $values = [
+            $this->encryptedPassword,
+            base64_encode($this->aesCrypt->getIV()),
+        ];
+
+        if ($this->aesCrypt->isAuthenticatedEncryptionRequired()) {
+            array_splice($values, 1, 0, base64_encode($this->aesCrypt->getTag()));
+        }
+
+        return (new Cookie(static::COOKIE))
+            ->setExpire($this->getExpiresAt())
+            ->setHttpOnly(true)
+            ->setValue(implode('|', $values));
+    }
+
+    /**
+     * Get the timestamp when the cookie expires
+     *
+     * Defaults to now plus 30 days, if not set via {@link setExpiresAt()}.
+     *
+     * @return int
+     */
+    public function getExpiresAt()
+    {
+        if ($this->expiresAt === null) {
+            $this->expiresAt = time() + 60 * 60 * 24 * 30;
+        }
+
+        return $this->expiresAt;
+    }
+
+    /**
+     * Set the timestamp when the cookie expires
+     *
+     * @param int $expiresAt
+     *
+     * @return $this
+     */
+    public function setExpiresAt($expiresAt)
+    {
+        $this->expiresAt = $expiresAt;
+
+        return $this;
+    }
+
+    /**
+     * Authenticate via the remember me cookie
+     *
+     * @return bool
+     *
+     * @throws \Icinga\Exception\AuthenticationException
+     */
+    public function authenticate()
+    {
+        $auth = Auth::getInstance();
+        $authChain = $auth->getAuthChain();
+        $authChain->setSkipExternalBackends(true);
+        $user = new User($this->username);
+        if (! $user->hasDomain()) {
+            $user->setDomain(Config::app()->get('authentication', 'default_domain'));
+        }
+
+        $authenticated = $authChain->authenticate(
+            $user,
+            $this->aesCrypt->decrypt($this->encryptedPassword)
+        );
+
+        if ($authenticated) {
+            $auth->setAuthenticated($user);
+        }
+
+        return $authenticated;
+    }
+
+    /**
+     * Persist the remember me information into the database
+     *
+     * To remove any previous stored information, set the iv
+     *
+     * @param string|null $iv To remove a specific iv record from the database
+     *
+     * @return $this
+     */
+    public function persist($iv = null)
+    {
+        if ($iv) {
+            $this->remove(bin2hex($iv));
+        }
+
+        $this->getDb()->insert(static::TABLE, [
+            'username'          => $this->username,
+            'passphrase'        => bin2hex($this->aesCrypt->getKey()),
+            'random_iv'         => bin2hex($this->aesCrypt->getIV()),
+            'http_user_agent'   => (new UserAgent)->getAgent(),
+            'expires_at'        => date('Y-m-d H:i:s', $this->getExpiresAt()),
+            'ctime'             => new Expression('NOW()'),
+            'mtime'             => new Expression('NOW()')
+        ]);
+
+        return $this;
+    }
+
+    /**
+     * Remove remember me information from the database on the basis of iv
+     *
+     * @param string $iv
+     *
+     * @return $this
+     */
+    public function remove($iv)
+    {
+        $this->getDb()->delete(static::TABLE, [
+            'random_iv = ?' => $iv
+        ]);
+
+        return $this;
+    }
+
+    /**
+     * Create renewed remember me cookie
+     *
+     * @return static New remember me cookie which has to be sent to the client
+     */
+    public function renew()
+    {
+        return static::fromCredentials(
+            $this->username,
+            $this->aesCrypt->decrypt($this->encryptedPassword)
+        );
+    }
+
+    /**
+     * Get all users using remember me cookie
+     *
+     * @return array Array of users
+     */
+    public static function getAllUser()
+    {
+        $rememberMe = new static();
+        if (! $rememberMe->hasDb()) {
+            return [];
+        }
+
+        $select = (new Select())
+            ->from(static::TABLE)
+            ->columns('username')
+            ->groupBy('username');
+
+        return $rememberMe->getDb()->select($select)->fetchAll();
+    }
+
+    /**
+     * Get all remember me entries from the database of the given user.
+     *
+     * @param $username
+     *
+     * @return array Array of database entries
+     */
+    public static function getAllByUsername($username)
+    {
+        $rememberMe = new static();
+        if (! $rememberMe->hasDb()) {
+            return [];
+        }
+
+        $select = (new Select())
+            ->from(static::TABLE)
+            ->columns(['http_user_agent', 'random_iv'])
+            ->where(['username = ?' => $username]);
+
+        return $rememberMe->getDb()->select($select)->fetchAll();
+    }
+
+    /**
+     * Get the AesCrypt instance
+     *
+     * @return AesCrypt
+     */
+    public function getAesCrypt()
+    {
+        return $this->aesCrypt;
+    }
+}
diff --git a/library/Icinga/Web/RememberMeUserDevicesList.php b/library/Icinga/Web/RememberMeUserDevicesList.php
new file mode 100644
index 0000000..66609de
--- /dev/null
+++ b/library/Icinga/Web/RememberMeUserDevicesList.php
@@ -0,0 +1,144 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Html;
+use ipl\Web\Url as iplWebUrl;  //alias is needed for php5.6
+use ipl\Web\Widget\Icon;
+use ipl\Web\Widget\Link;
+
+class RememberMeUserDevicesList extends BaseHtmlElement
+{
+    protected $tag = 'table';
+
+    protected $defaultAttributes = [
+        'class'             => 'common-table',
+        'data-base-target'  => '_self'
+    ];
+
+    /**
+     * @var array
+     */
+    protected $devicesList;
+
+    /**
+     * @var string
+     */
+    protected $username;
+
+    /**
+     * @var string
+     */
+    protected $url;
+
+    /**
+     * @return string
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+
+    /**
+     * @param string $url
+     *
+     * @return $this
+     */
+    public function setUrl($url)
+    {
+        $this->url = $url;
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getUsername()
+    {
+        return $this->username;
+    }
+
+    /**
+     * @param string $username
+     *
+     * @return $this
+     */
+    public function setUsername($username)
+    {
+        $this->username = $username;
+
+        return $this;
+    }
+
+    /**
+     * @return array List of devices. Each device contains user agent and fingerprint string
+     */
+    public function getDevicesList()
+    {
+        return $this->devicesList;
+    }
+
+    /**
+     * @param $devicesList
+     *
+     * @return $this
+     */
+    public function setDevicesList($devicesList)
+    {
+        $this->devicesList = $devicesList;
+
+        return $this;
+    }
+
+    protected function assemble()
+    {
+        $thead = Html::tag('thead');
+        $theadRow = Html::tag('tr')
+            ->add(Html::tag(
+                'th',
+                sprintf(t('List of devices and browsers %s is currently logged in:'), $this->getUsername())
+            ));
+
+        $thead->add($theadRow);
+
+        $head = Html::tag('tr')
+            ->add(Html::tag('th', t('OS')))
+            ->add(Html::tag('th', t('Browser')))
+            ->add(Html::tag('th', t('Fingerprint')));
+
+        $thead->add($head);
+        $tbody = Html::tag('tbody');
+
+        if (empty($this->getDevicesList())) {
+            $tbody->add(Html::tag('td', t('No device found')));
+        } else {
+            foreach ($this->getDevicesList() as $device) {
+                $agent = new UserAgent($device);
+                $element = Html::tag('tr')
+                    ->add(Html::tag('td', $agent->getOs()))
+                    ->add(Html::tag('td', $agent->getBrowser()))
+                    ->add(Html::tag('td', $device->random_iv));
+
+                $link = (new Link(
+                    new Icon('trash'),
+                    iplWebUrl::fromPath($this->getUrl())
+                        ->addParams(
+                            [
+                                'name'          => $this->getUsername(),
+                                'fingerprint'   => $device->random_iv,
+                            ]
+                        )
+                ));
+
+                $element->add(Html::tag('td', $link));
+                $tbody->add($element);
+            }
+        }
+
+        $this->add($thead);
+        $this->add($tbody);
+    }
+}
diff --git a/library/Icinga/Web/RememberMeUserList.php b/library/Icinga/Web/RememberMeUserList.php
new file mode 100644
index 0000000..bb95dc9
--- /dev/null
+++ b/library/Icinga/Web/RememberMeUserList.php
@@ -0,0 +1,106 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Html;
+use ipl\Web\Url as iplWebUrl;  //alias is needed for php5.6
+use ipl\Web\Widget\Link;
+
+/**
+ * Class RememberMeUserList
+ *
+ * @package Icinga\Web
+ */
+class RememberMeUserList extends BaseHtmlElement
+{
+    protected $tag = 'table';
+
+    protected $defaultAttributes = [
+        'class'             => 'common-table table-row-selectable',
+        'data-base-target'  => '_next',
+    ];
+
+    /**
+     * @var array
+     */
+    protected $users;
+
+    /**
+     * @var string
+     */
+    protected $url;
+
+    /**
+     * @return string
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+
+    /**
+     * @param string $url
+     *
+     * @return $this
+     */
+    public function setUrl($url)
+    {
+        $this->url = $url;
+
+        return $this;
+    }
+
+    /**
+     * @return array
+     */
+    public function getUsers()
+    {
+        return $this->users;
+    }
+
+    /**
+     * @param array $users
+     *
+     * @return $this
+     */
+    public function setUsers($users)
+    {
+        $this->users = $users;
+
+        return $this;
+    }
+
+    protected function assemble()
+    {
+        $thead = Html::tag('thead');
+        $theadRow = Html::tag('tr')
+            ->add(Html::tag(
+                'th',
+                t('List of users who stay logged in')
+            ));
+
+        $thead->add($theadRow);
+        $tbody = Html::tag('tbody');
+
+        if (empty($this->getUsers())) {
+            $tbody->add(Html::tag('td', t('No user found')));
+        } else {
+            foreach ($this->getUsers() as $user) {
+                $element = Html::tag('tr');
+                $link = new Link(
+                    $user->username,
+                    iplWebUrl::fromPath($this->getUrl())->addParams(['name' => $user->username]),
+                    ['title' => sprintf(t('Device list of %s'), $user->username)]
+                );
+
+                $element->add(Html::tag('td', $link));
+                $tbody->add($element);
+            }
+        }
+
+        $this->add($thead);
+        $this->add($tbody);
+    }
+}
diff --git a/library/Icinga/Web/Request.php b/library/Icinga/Web/Request.php
new file mode 100644
index 0000000..064ce63
--- /dev/null
+++ b/library/Icinga/Web/Request.php
@@ -0,0 +1,142 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Util\Json;
+use Zend_Controller_Request_Http;
+use Icinga\Application\Icinga;
+use Icinga\User;
+
+/**
+ * A request
+ */
+class Request extends Zend_Controller_Request_Http
+{
+    /**
+     * Response
+     *
+     * @var Response
+     */
+    protected $response;
+
+    /**
+     * Unique identifier
+     *
+     * @var string
+     */
+    protected $uniqueId;
+
+    /**
+     * Request URL
+     *
+     * @var Url
+     */
+    protected $url;
+
+    /**
+     * User if authenticated
+     *
+     * @var User|null
+     */
+    protected $user;
+
+    /**
+     * Get the response
+     *
+     * @return Response
+     */
+    public function getResponse()
+    {
+        if ($this->response === null) {
+            $this->response = Icinga::app()->getResponse();
+        }
+
+        return $this->response;
+    }
+
+    /**
+     * Get the request URL
+     *
+     * @return Url
+     */
+    public function getUrl()
+    {
+        if ($this->url === null) {
+            $this->url = Url::fromRequest($this);
+        }
+        return $this->url;
+    }
+
+    /**
+     * Get the user if authenticated
+     *
+     * @return User|null
+     */
+    public function getUser()
+    {
+        return $this->user;
+    }
+
+    /**
+     * Set the authenticated user
+     *
+     * @param   User $user
+     *
+     * @return  $this
+     */
+    public function setUser(User $user)
+    {
+        $this->user = $user;
+        return $this;
+    }
+
+    /**
+     * Get whether the request seems to be an API request
+     *
+     * @return bool
+     */
+    public function isApiRequest()
+    {
+        return $this->getHeader('Accept') === 'application/json';
+    }
+
+    /**
+     * Makes an ID unique to this request, to prevent id collisions in different containers
+     *
+     * Call this whenever an ID might show up multiple times in different containers. This function is useful
+     * for ensuring unique ids on sites, even if we combine the HTML of different requests into one site,
+     * while still being able to reference elements uniquely in the same request.
+     *
+     * @param   string  $id
+     *
+     * @return  string  The id suffixed w/ an identifier unique to this request
+     */
+    public function protectId($id)
+    {
+        return $id . '-' . Window::getInstance()->getContainerId();
+    }
+
+    public function getPost($key = null, $default = null)
+    {
+        if ($key === null && $this->extractMediaType($this->getHeader('Content-Type')) === 'application/json') {
+            return Json::decode(file_get_contents('php://input'), true);
+        }
+
+        return parent::getPost($key, $default);
+    }
+
+    /**
+     * Extract and return the media type from the given header value
+     *
+     * @param   string  $headerValue
+     *
+     * @return  string
+     */
+    protected function extractMediaType($headerValue)
+    {
+        // Pretty basic and does not care about parameters
+        $parts = explode(';', $headerValue, 2);
+        return strtolower(trim($parts[0]));
+    }
+}
diff --git a/library/Icinga/Web/Response.php b/library/Icinga/Web/Response.php
new file mode 100644
index 0000000..555d3fa
--- /dev/null
+++ b/library/Icinga/Web/Response.php
@@ -0,0 +1,460 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Config;
+use Icinga\Util\Csp;
+use Zend_Controller_Response_Http;
+use Icinga\Application\Icinga;
+use Icinga\Web\Response\JsonResponse;
+
+/**
+ * A HTTP response
+ */
+class Response extends Zend_Controller_Response_Http
+{
+    /**
+     * The default content type being used for responses
+     *
+     * @var string
+     */
+    const DEFAULT_CONTENT_TYPE = 'text/html; charset=UTF-8';
+
+    /**
+     * Auto-refresh interval
+     *
+     * @var int
+     */
+    protected $autoRefreshInterval;
+
+    /**
+     * Set of cookies which are to be sent to the client
+     *
+     * @var CookieSet
+     */
+    protected $cookies;
+
+    /**
+     * Redirect URL
+     *
+     * @var Url|null
+     */
+    protected $redirectUrl;
+
+    /**
+     * Request
+     *
+     * @var Request
+     */
+    protected $request;
+
+    /**
+     * Whether to instruct the client to reload the window
+     *
+     * @var bool
+     */
+    protected $reloadWindow;
+
+    /**
+     * Whether to instruct client side script code to reload CSS
+     *
+     * @var bool
+     */
+    protected $reloadCss;
+
+    /**
+     * Whether to send the rerender layout header on XHR
+     *
+     * @var bool
+     */
+    protected $rerenderLayout = false;
+
+    /**
+     * Whether to send the current window ID to the client
+     *
+     * @var bool
+     */
+    protected $overrideWindowId = false;
+
+    /**
+     * Get the auto-refresh interval
+     *
+     * @return int
+     */
+    public function getAutoRefreshInterval()
+    {
+        return $this->autoRefreshInterval;
+    }
+
+    /**
+     * Set the auto-refresh interval
+     *
+     * @param   int $autoRefreshInterval
+     *
+     * @return  $this
+     */
+    public function setAutoRefreshInterval($autoRefreshInterval)
+    {
+        $this->autoRefreshInterval = $autoRefreshInterval;
+        return $this;
+    }
+
+    /**
+     * Get the set of cookies which are to be sent to the client
+     *
+     * @return  CookieSet
+     */
+    public function getCookies()
+    {
+        if ($this->cookies === null) {
+            $this->cookies = new CookieSet();
+        }
+        return $this->cookies;
+    }
+
+    /**
+     * Get the cookie with the given name from the set of cookies which are to be sent to the client
+     *
+     * @param   string  $name       The name of the cookie
+     *
+     * @return  Cookie|null         The cookie with the given name or null if the cookie does not exist
+     */
+    public function getCookie($name)
+    {
+        return $this->getCookies()->get($name);
+    }
+
+    /**
+     * Set the given cookie for sending it to the client
+     *
+     * @param   Cookie  $cookie The cookie to send to the client
+     *
+     * @return  $this
+     */
+    public function setCookie(Cookie $cookie)
+    {
+        $this->getCookies()->add($cookie);
+        return $this;
+    }
+
+    /**
+     * Get the redirect URL
+     *
+     * @return Url|null
+     */
+    protected function getRedirectUrl()
+    {
+        return $this->redirectUrl;
+    }
+
+    /**
+     * Set the redirect URL
+     *
+     * Unlike {@link setRedirect()} this method only sets a redirect URL on the response for later usage.
+     * {@link prepare()} will take care of the correct redirect handling and HTTP headers on XHR and "normal" browser
+     * requests.
+     *
+     * @param   string|Url $redirectUrl
+     *
+     * @return  $this
+     */
+    protected function setRedirectUrl($redirectUrl)
+    {
+        if (! $redirectUrl instanceof Url) {
+            $redirectUrl = Url::fromPath((string) $redirectUrl);
+        }
+        $redirectUrl->getParams()->setSeparator('&');
+        $this->redirectUrl = $redirectUrl;
+        return $this;
+    }
+
+    /**
+     * Get an array of all header values for the given name
+     *
+     * @param   string  $name       The name of the header
+     * @param   bool    $lastOnly   If this is true, the last value will be returned as a string
+     *
+     * @return  null|array|string
+     */
+    public function getHeader($name, $lastOnly = false)
+    {
+        $result = ($lastOnly ? null : array());
+        $headers = $this->getHeaders();
+        foreach ($headers as $header) {
+            if ($header['name'] === $name) {
+                if ($lastOnly) {
+                    $result = $header['value'];
+                } else {
+                    $result[] = $header['value'];
+                }
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Get the request
+     *
+     * @return Request
+     */
+    public function getRequest()
+    {
+        if ($this->request === null) {
+            $this->request = Icinga::app()->getRequest();
+        }
+        return $this->request;
+    }
+
+    /**
+     * Get whether to instruct the client to reload the window
+     *
+     * @return bool
+     */
+    public function isWindowReloaded()
+    {
+        return $this->reloadWindow;
+    }
+
+    /**
+     * Set whether to instruct the client to reload the window
+     *
+     * @param bool $reloadWindow
+     *
+     * @return $this
+     */
+    public function setReloadWindow($reloadWindow)
+    {
+        $this->reloadWindow = $reloadWindow;
+
+        return $this;
+    }
+
+    /**
+     * Get whether to instruct client side script code to reload CSS
+     *
+     * @return bool
+     */
+    public function isReloadCss()
+    {
+        return $this->reloadCss;
+    }
+
+    /**
+     * Set whether to instruct client side script code to reload CSS
+     *
+     * @param   bool    $reloadCss
+     *
+     * @return  $this
+     */
+    public function setReloadCss($reloadCss)
+    {
+        $this->reloadCss = $reloadCss;
+        return $this;
+    }
+
+    /**
+     * Get whether to send the rerender layout header on XHR
+     *
+     * @return bool
+     */
+    public function getRerenderLayout()
+    {
+        return $this->rerenderLayout;
+    }
+
+    /**
+     * Get whether to send the rerender layout header on XHR
+     *
+     * @param   bool $rerenderLayout
+     *
+     * @return  $this
+     */
+    public function setRerenderLayout($rerenderLayout = true)
+    {
+        $this->rerenderLayout = (bool) $rerenderLayout;
+        return $this;
+    }
+
+    /**
+     * Get whether to send the current window ID to the client
+     *
+     * @return bool
+     */
+    public function getOverrideWindowId()
+    {
+        return $this->overrideWindowId;
+    }
+
+    /**
+     * Set whether to send the current window ID to the client
+     *
+     * @param bool $overrideWindowId
+     *
+     * @return $this
+     */
+    public function setOverrideWindowId($overrideWindowId = true)
+    {
+        $this->overrideWindowId = $overrideWindowId;
+        return $this;
+    }
+
+    /**
+     * Entry point for HTTP responses in JSON format
+     *
+     * @return JsonResponse
+     */
+    public function json()
+    {
+        $response = new JsonResponse();
+        $response->copyMetaDataFrom($this);
+        return $response;
+    }
+
+    /**
+     * Prepare the request before sending
+     */
+    protected function prepare()
+    {
+        $request = $this->getRequest();
+        $redirectUrl = $this->getRedirectUrl();
+        if ($request->isXmlHttpRequest()) {
+            if ($redirectUrl !== null) {
+                if ($request->isGet() && Icinga::app()->getViewRenderer()->view->compact) {
+                    if ($redirectUrl->getParam('redirect') !== '__SELF__') {
+                        $redirectUrl->getParams()->set('showCompact', true);
+                    }
+                }
+
+                $encodedRedirectUrl = rawurlencode($redirectUrl->getAbsoluteUrl());
+
+                // TODO: Compatibility only. Remove once v2.14 is out.
+                $targetId = $request->getHeader('X-Icinga-Container');
+                $redirectTargetId = $this->getHeader('X-Icinga-Container', true) ?? $targetId;
+                if ($request->isPost()
+                    && ! $this->getRerenderLayout()
+                    && $targetId === 'col2'
+                    && $redirectTargetId === $targetId
+                    && $request->getHeader('X-Icinga-Col2-State')
+                ) {
+                    $col1State = Url::fromPath($request->getHeader('X-Icinga-Col1-State'));
+                    $col2State = Url::fromPath($request->getHeader('X-Icinga-Col2-State'));
+                    if ($col2State->getPath() !== $redirectUrl->getPath()
+                        && $col1State->getPath() === $redirectUrl->getPath()
+                    ) {
+                        $encodedRedirectUrl = '__CLOSE__';
+                    }
+                }
+
+                $this->setHeader('X-Icinga-Redirect', $encodedRedirectUrl, true);
+                if ($this->getRerenderLayout()) {
+                    $this->setHeader('X-Icinga-Rerender-Layout', 'yes', true);
+                }
+            }
+            if ($this->getOverrideWindowId()) {
+                $this->setHeader('X-Icinga-WindowId', Window::getInstance()->getId(), true);
+            }
+            if ($this->getRerenderLayout()) {
+                $this->setHeader('X-Icinga-Container', 'layout', true);
+            }
+            if ($this->isWindowReloaded()) {
+                $this->setHeader('X-Icinga-Reload-Window', 'yes', true);
+            }
+            if ($this->isReloadCss()) {
+                $this->setHeader('X-Icinga-Reload-Css', 'now', true);
+            }
+            if (($autoRefreshInterval = $this->getAutoRefreshInterval()) !== null) {
+                $this->setHeader('X-Icinga-Refresh', $autoRefreshInterval, true);
+            }
+
+            $notifications = Notification::getInstance();
+            if ($notifications->hasMessages()) {
+                $notificationList = array();
+                foreach ($notifications->popMessages() as $m) {
+                    $notificationList[] = rawurlencode($m->type . ' ' . $m->message);
+                }
+                $this->setHeader('X-Icinga-Notification', implode('&', $notificationList), true);
+            }
+        } else {
+            if ($redirectUrl !== null) {
+                $this->setRedirect($redirectUrl->getAbsoluteUrl());
+            }
+
+            if (Csp::getStyleNonce() && Config::app()->get('security', 'use_strict_csp', false)) {
+                Csp::addHeader($this);
+            }
+        }
+
+        if (! $this->getHeader('Content-Type', true)) {
+            $this->setHeader('Content-Type', static::DEFAULT_CONTENT_TYPE);
+        }
+    }
+
+    /**
+     * Redirect to the given URL and exit immediately
+     *
+     * @param string|Url $url
+     *
+     * @return never
+     */
+    public function redirectAndExit($url)
+    {
+        $this->setRedirectUrl($url);
+
+        $session = Session::getSession();
+        if ($session->hasChanged()) {
+            $session->write();
+        }
+
+        $this->sendHeaders();
+        exit;
+    }
+
+    /**
+     * Send the cookies to the client
+     */
+    public function sendCookies()
+    {
+        foreach ($this->getCookies() as $cookie) {
+            /** @var Cookie $cookie */
+            setcookie(
+                $cookie->getName(),
+                $cookie->getValue() ?? '',
+                $cookie->getExpire() ?? 0,
+                $cookie->getPath(),
+                $cookie->getDomain() ?? '',
+                $cookie->isSecure(),
+                $cookie->isHttpOnly() ?? true
+            );
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function sendHeaders()
+    {
+        $this->prepare();
+        if (! $this->getRequest()->isApiRequest()) {
+            $this->sendCookies();
+        }
+        return parent::sendHeaders();
+    }
+
+    /**
+     * Copies non-body-related response data from $response
+     *
+     * @param   Response    $response
+     *
+     * @return  $this
+     */
+    protected function copyMetaDataFrom(self $response)
+    {
+        $this->_headers = $response->_headers;
+        $this->_headersRaw = $response->_headersRaw;
+        $this->_httpResponseCode = $response->_httpResponseCode;
+        $this->headersSentThrowsException = $response->headersSentThrowsException;
+        return $this;
+    }
+}
diff --git a/library/Icinga/Web/Response/JsonResponse.php b/library/Icinga/Web/Response/JsonResponse.php
new file mode 100644
index 0000000..025e88d
--- /dev/null
+++ b/library/Icinga/Web/Response/JsonResponse.php
@@ -0,0 +1,241 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Response;
+
+use Icinga\Util\Json;
+use Zend_Controller_Action_HelperBroker;
+use Icinga\Web\Response;
+
+/**
+ * HTTP response in JSON format
+ */
+class JsonResponse extends Response
+{
+    /**
+     * {@inheritdoc}
+     */
+    const DEFAULT_CONTENT_TYPE = 'application/json';
+
+    /**
+     * Status identifier for failed API calls due to an error on the server
+     *
+     * @var string
+     */
+    const STATUS_ERROR = 'error';
+
+    /**
+     * Status identifier for rejected API calls most due to invalid data or call conditions
+     *
+     * @var string
+     */
+    const STATUS_FAIL = 'fail';
+
+    /**
+     * Status identifier for successful API requests
+     *
+     * @var string
+     */
+    const STATUS_SUCCESS = 'success';
+
+    /**
+     * JSON encoding options
+     *
+     * @var int
+     */
+    protected $encodingOptions = 0;
+
+    /**
+     * Whether to automatically sanitize invalid UTF-8 (if any)
+     *
+     * @var bool
+     */
+    protected $autoSanitize = false;
+
+    /**
+     * Error message if the API call failed due to a server error
+     *
+     * @var string|null
+     */
+    protected $errorMessage;
+
+    /**
+     * Fail data for rejected API calls
+     *
+     * @var array|null
+     */
+    protected $failData;
+
+    /**
+     * API request status
+     *
+     * @var string
+     */
+    protected $status;
+
+    /**
+     * Success data for successful API requests
+     *
+     * @var array|null
+     */
+    protected $successData;
+
+    /**
+     * Get the JSON encoding options
+     *
+     * @return int
+     */
+    public function getEncodingOptions()
+    {
+        return $this->encodingOptions;
+    }
+
+    /**
+     * Set the JSON encoding options
+     *
+     * @param   int $encodingOptions
+     *
+     * @return  $this
+     */
+    public function setEncodingOptions($encodingOptions)
+    {
+        $this->encodingOptions = (int) $encodingOptions;
+        return $this;
+    }
+
+    /**
+     * Get whether to automatically sanitize invalid UTF-8 (if any)
+     *
+     * @return bool
+     */
+    public function getAutoSanitize()
+    {
+        return $this->autoSanitize;
+    }
+
+    /**
+     * Set whether to automatically sanitize invalid UTF-8 (if any)
+     *
+     * @param   bool    $autoSanitize
+     *
+     * @return  $this
+     */
+    public function setAutoSanitize($autoSanitize = true)
+    {
+        $this->autoSanitize = $autoSanitize;
+
+        return $this;
+    }
+
+    /**
+     * Get the error message if the API call failed due to a server error
+     *
+     * @return string|null
+     */
+    public function getErrorMessage()
+    {
+        return $this->errorMessage;
+    }
+
+    /**
+     * Set the error message if the API call failed due to a server error
+     *
+     * @param   string $errorMessage
+     *
+     * @return  $this
+     */
+    public function setErrorMessage($errorMessage)
+    {
+        $this->errorMessage = (string) $errorMessage;
+        $this->status = static::STATUS_ERROR;
+        return $this;
+    }
+
+    /**
+     * Get the fail data for rejected API calls
+     *
+     * @return array|null
+     */
+    public function getFailData()
+    {
+        return (! is_array($this->failData) || empty($this->failData)) ? null : $this->failData;
+    }
+
+    /**
+     * Set the fail data for rejected API calls
+     *
+     * @param   array $failData
+     *
+     * @return $this
+     */
+    public function setFailData(array $failData)
+    {
+        $this->failData = $failData;
+        $this->status = static::STATUS_FAIL;
+        return $this;
+    }
+
+    /**
+     * Get the data for successful API requests
+     *
+     * @return array|null
+     */
+    public function getSuccessData()
+    {
+        return (! is_array($this->successData) || empty($this->successData)) ? null : $this->successData;
+    }
+
+    /**
+     * Set the data for successful API requests
+     *
+     * @param   array $successData
+     *
+     * @return  $this
+     */
+    public function setSuccessData(array $successData = null)
+    {
+        $this->successData = $successData;
+        $this->status = static::STATUS_SUCCESS;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function outputBody()
+    {
+        $body = array(
+            'status' => $this->status
+        );
+        switch ($this->status) {
+            /** @noinspection PhpMissingBreakStatementInspection */
+            case static::STATUS_ERROR:
+                $body['message'] = $this->getErrorMessage();
+                // Fallthrough
+            case static::STATUS_FAIL:
+                $failData = $this->getFailData();
+                if ($failData !== null || $this->status === static::STATUS_FAIL) {
+                    $body['data'] = $failData;
+                }
+                break;
+            case static::STATUS_SUCCESS:
+                $body['data'] = $this->getSuccessData();
+                break;
+        }
+        echo $this->getAutoSanitize()
+            ? Json::sanitize($body, $this->getEncodingOptions())
+            : Json::encode($body, $this->getEncodingOptions());
+    }
+
+    /**
+     * Send the response, including all headers, excluding a rendered view.
+     *
+     * @return never
+     */
+    public function sendResponse()
+    {
+        Zend_Controller_Action_HelperBroker::getStaticHelper('viewRenderer')->setNoRender(true);
+        parent::sendResponse();
+        exit;
+    }
+}
diff --git a/library/Icinga/Web/Session.php b/library/Icinga/Web/Session.php
new file mode 100644
index 0000000..40df89f
--- /dev/null
+++ b/library/Icinga/Web/Session.php
@@ -0,0 +1,54 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Web\Session\PhpSession;
+use Icinga\Web\Session\Session as BaseSession;
+use Icinga\Exception\ProgrammingError;
+
+/**
+ * Session container
+ */
+class Session
+{
+    /**
+     * The current session
+     *
+     * @var BaseSession $session
+     */
+    private static $session;
+
+    /**
+     * Create the session
+     *
+     * @param   BaseSession  $session
+     *
+     * @return  BaseSession
+     */
+    public static function create(BaseSession $session = null)
+    {
+        if ($session === null) {
+            self::$session = PhpSession::create();
+        } else {
+            self::$session = $session;
+        }
+
+        return self::$session;
+    }
+
+    /**
+     * Return the current session
+     *
+     * @return  BaseSession
+     * @throws  ProgrammingError
+     */
+    public static function getSession()
+    {
+        if (self::$session === null) {
+            self::create();
+        }
+
+        return self::$session;
+    }
+}
diff --git a/library/Icinga/Web/Session/Php72Session.php b/library/Icinga/Web/Session/Php72Session.php
new file mode 100644
index 0000000..e6a6b19
--- /dev/null
+++ b/library/Icinga/Web/Session/Php72Session.php
@@ -0,0 +1,37 @@
+<?php
+/* Icinga Web 2 | (c) 2017 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Session;
+
+use Icinga\Application\Logger;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Web\Cookie;
+
+/**
+ * Session implementation in PHP
+ */
+class Php72Session extends PhpSession
+{
+    /**
+     * Open a PHP session
+     */
+    protected function open()
+    {
+        session_name($this->sessionName);
+
+        $cookie = new Cookie('bogus');
+        session_set_cookie_params(
+            0,
+            $cookie->getPath(),
+            $cookie->getDomain(),
+            $cookie->isSecure(),
+            true
+        );
+
+        session_start(array(
+            'use_cookies'       => true,
+            'use_only_cookies'  => true,
+            'use_trans_sid'     => false
+        ));
+    }
+}
diff --git a/library/Icinga/Web/Session/PhpSession.php b/library/Icinga/Web/Session/PhpSession.php
new file mode 100644
index 0000000..36dd84e
--- /dev/null
+++ b/library/Icinga/Web/Session/PhpSession.php
@@ -0,0 +1,256 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Session;
+
+use Icinga\Application\Logger;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Web\Cookie;
+
+/**
+ * Session implementation in PHP
+ */
+class PhpSession extends Session
+{
+    /**
+     * The namespace prefix
+     *
+     * Used to differentiate between standard session keys and namespace identifiers
+     */
+    const NAMESPACE_PREFIX = 'ns.';
+
+    /**
+     * Whether the session has already been closed
+     *
+     * @var bool
+     */
+    protected $hasBeenTouched = false;
+
+    /**
+     * Name of the session
+     *
+     * @var string
+     */
+    protected $sessionName = 'Icingaweb2';
+
+    /**
+     * Create a new PHPSession object using the provided options (if any)
+     *
+     * @param   array   $options    An optional array of ini options to set
+     *
+     * @return  static
+     *
+     * @throws  ConfigurationError
+     * @see     http://php.net/manual/en/session.configuration.php
+     */
+    public static function create(array $options = null)
+    {
+        return version_compare(PHP_VERSION, '7.2.0') < 0 ? new self($options) : new Php72Session($options);
+    }
+
+    /**
+     * Create a new PHPSession object using the provided options (if any)
+     *
+     * @param   array   $options    An optional array of ini options to set
+     *
+     * @throws  ConfigurationError
+     * @see     http://php.net/manual/en/session.configuration.php
+     */
+    public function __construct(array $options = null)
+    {
+        $defaultCookieOptions = array(
+            'use_trans_sid'     => false,
+            'use_cookies'       => true,
+            'cookie_httponly'   => true,
+            'use_only_cookies'  => true
+        );
+
+        if (version_compare(PHP_VERSION, '7.1.0') < 0) {
+            $defaultCookieOptions['hash_function'] = true;
+            $defaultCookieOptions['hash_bits_per_character'] = 5;
+        } else {
+            $defaultCookieOptions['sid_bits_per_character'] = 5;
+        }
+
+        if ($options !== null) {
+            $options = array_merge($defaultCookieOptions, $options);
+        } else {
+            $options = $defaultCookieOptions;
+        }
+
+        if (array_key_exists('test_session_name', $options)) {
+            $this->sessionName = $options['test_session_name'];
+            unset($options['test_session_name']);
+        }
+
+        foreach ($options as $sessionVar => $value) {
+            if (ini_set("session." . $sessionVar, $value) === false) {
+                Logger::warning(
+                    'Could not set php.ini setting %s = %s. This might affect your sessions behaviour.',
+                    $sessionVar,
+                    $value
+                );
+            }
+        }
+
+        $sessionSavePath = session_save_path() ?: sys_get_temp_dir();
+        if (session_module_name() === 'files' && !is_writable($sessionSavePath)) {
+            throw new ConfigurationError("Can't save session, path '$sessionSavePath' is not writable.");
+        }
+
+        if ($this->exists()) {
+            // We do not want to start a new session here if there is not any
+            $this->read();
+        }
+    }
+
+    /**
+     * Open a PHP session
+     */
+    protected function open()
+    {
+        session_name($this->sessionName);
+
+        if ($this->hasBeenTouched) {
+            $cacheLimiter = ini_get('session.cache_limiter');
+            ini_set('session.use_cookies', false);
+            ini_set('session.use_only_cookies', false);
+            ini_set('session.cache_limiter', null);
+        }
+
+        $cookie = new Cookie('bogus');
+        session_set_cookie_params(
+            0,
+            $cookie->getPath(),
+            $cookie->getDomain(),
+            $cookie->isSecure(),
+            true
+        );
+
+        session_start();
+
+        if ($this->hasBeenTouched) {
+            ini_set('session.use_cookies', true);
+            ini_set('session.use_only_cookies', true);
+            /** @noinspection PhpUndefinedVariableInspection */
+            ini_set('session.cache_limiter', $cacheLimiter);
+        }
+    }
+
+    /**
+     * Read all values written to the underling session and make them accessible.
+     */
+    public function read()
+    {
+        $this->clear();
+        $this->open();
+
+        foreach ($_SESSION as $key => $value) {
+            if (strpos($key, self::NAMESPACE_PREFIX) === 0) {
+                $namespace = new SessionNamespace();
+                $namespace->setAll($value);
+                $this->namespaces[substr($key, strlen(self::NAMESPACE_PREFIX))] = $namespace;
+            } else {
+                $this->set($key, $value);
+            }
+        }
+
+        session_write_close();
+        $this->hasBeenTouched = true;
+    }
+
+    /**
+     * Write all values of this session object to the underlying session implementation
+     */
+    public function write()
+    {
+        $this->open();
+
+        foreach ($this->removed as $key) {
+            unset($_SESSION[$key]);
+        }
+        foreach ($this->values as $key => $value) {
+            $_SESSION[$key] = $value;
+        }
+        foreach ($this->removedNamespaces as $identifier) {
+            unset($_SESSION[self::NAMESPACE_PREFIX . $identifier]);
+        }
+        foreach ($this->namespaces as $identifier => $namespace) {
+            $_SESSION[self::NAMESPACE_PREFIX . $identifier] = $namespace->getAll();
+        }
+
+        session_write_close();
+        $this->hasBeenTouched = true;
+    }
+
+    /**
+     * Delete the current session, causing all session information to be lost
+     */
+    public function purge()
+    {
+        $this->open();
+        $_SESSION = array();
+        $this->clear();
+        session_destroy();
+        $this->clearCookies();
+        session_write_close();
+        $this->hasBeenTouched = true;
+    }
+
+    /**
+     * Remove session cookies
+     */
+    protected function clearCookies()
+    {
+        if (ini_get('session.use_cookies')) {
+            Logger::debug('Clear session cookie');
+            $params = session_get_cookie_params();
+            setcookie(
+                session_name(),
+                '',
+                time() - 42000,
+                $params['path'],
+                $params['domain'],
+                $params['secure'],
+                $params['httponly']
+            );
+        }
+    }
+
+    /**
+     * @see Session::getId()
+     */
+    public function getId()
+    {
+        if (($id = session_id()) === '') {
+            // Make sure we actually get a id
+            $this->open();
+            session_write_close();
+            $this->hasBeenTouched = true;
+            $id = session_id();
+        }
+
+        return $id;
+    }
+
+    /**
+     * Assign a new sessionId to the currently active session
+     */
+    public function refreshId()
+    {
+        $this->open();
+        if ($this->exists()) {
+            session_regenerate_id();
+        }
+        session_write_close();
+        $this->hasBeenTouched = true;
+    }
+
+    /**
+     * @see Session::exists()
+     */
+    public function exists()
+    {
+        return isset($_COOKIE[$this->sessionName]);
+    }
+}
diff --git a/library/Icinga/Web/Session/Session.php b/library/Icinga/Web/Session/Session.php
new file mode 100644
index 0000000..e73e9b4
--- /dev/null
+++ b/library/Icinga/Web/Session/Session.php
@@ -0,0 +1,126 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Session;
+
+use Icinga\Exception\NotImplementedError;
+
+/**
+ * Base class for handling sessions
+ */
+abstract class Session extends SessionNamespace
+{
+    /**
+     * Container for session namespaces
+     *
+     * @var array
+     */
+    protected $namespaces = array();
+
+    /**
+     * The identifiers of all namespaces removed from this session
+     *
+     * @var array
+     */
+    protected $removedNamespaces = array();
+
+    /**
+     * Read all values from the underlying session implementation
+     */
+    abstract public function read();
+
+    /**
+     * Persists changes to the underlying session implementation
+     */
+    public function write()
+    {
+        throw new NotImplementedError('You are required to implement write() in your session implementation');
+    }
+
+    /**
+     * Return whether a session exists
+     *
+     * @return  bool
+     */
+    abstract public function exists();
+
+    /**
+     * Purge session
+     */
+    abstract public function purge();
+
+    /**
+     * Assign a new session id to this session.
+     */
+    abstract public function refreshId();
+
+    /**
+     * Return the id of this session
+     *
+     * @return  string
+     */
+    abstract public function getId();
+
+    /**
+     * Get or create a new session namespace
+     *
+     * @param   string      $identifier     The namespace's identifier
+     *
+     * @return  SessionNamespace
+     */
+    public function getNamespace($identifier)
+    {
+        if (!isset($this->namespaces[$identifier])) {
+            if (in_array($identifier, $this->removedNamespaces, true)) {
+                unset($this->removedNamespaces[array_search($identifier, $this->removedNamespaces, true)]);
+            }
+
+            $this->namespaces[$identifier] = new SessionNamespace();
+        }
+
+        return $this->namespaces[$identifier];
+    }
+
+    /**
+     * Return whether the given session namespace exists
+     *
+     * @param   string      $identifier     The namespace's identifier to check
+     *
+     * @return  bool
+     */
+    public function hasNamespace($identifier)
+    {
+        return isset($this->namespaces[$identifier]);
+    }
+
+    /**
+     * Remove the given session namespace
+     *
+     * @param   string      $identifier     The identifier of the namespace to remove
+     */
+    public function removeNamespace($identifier)
+    {
+        unset($this->namespaces[$identifier]);
+        $this->removedNamespaces[] = $identifier;
+    }
+
+    /**
+     * Return whether the session has changed
+     *
+     * @return  bool
+     */
+    public function hasChanged()
+    {
+        return parent::hasChanged() || false === empty($this->namespaces) || false === empty($this->removedNamespaces);
+    }
+
+    /**
+     * Clear all values and namespaces from the session cache
+     */
+    public function clear()
+    {
+        parent::clear();
+        $this->namespaces = array();
+        $this->removedNamespaces = array();
+    }
+}
diff --git a/library/Icinga/Web/Session/SessionNamespace.php b/library/Icinga/Web/Session/SessionNamespace.php
new file mode 100644
index 0000000..1c9c13f
--- /dev/null
+++ b/library/Icinga/Web/Session/SessionNamespace.php
@@ -0,0 +1,201 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Session;
+
+use Exception;
+use ArrayIterator;
+use Icinga\Exception\IcingaException;
+use IteratorAggregate;
+use Traversable;
+
+/**
+ * Container for session values
+ */
+class SessionNamespace implements IteratorAggregate
+{
+    /**
+     * The actual values stored in this container
+     *
+     * @var array
+     */
+    protected $values = array();
+
+    /**
+     * The names of all values removed from this container
+     *
+     * @var array
+     */
+    protected $removed = array();
+
+    /**
+     * Return an iterator for all values in this namespace
+     *
+     * @return  ArrayIterator
+     */
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->getAll());
+    }
+
+    /**
+     * Set a session value by property access
+     *
+     * @param   string  $key    The value's name
+     * @param   mixed   $value  The value
+     */
+    public function __set($key, $value)
+    {
+        $this->set($key, $value);
+    }
+
+    /**
+     * Return a session value by property access
+     *
+     * @param   string  $key    The value's name
+     *
+     * @return  mixed           The value
+     * @throws  Exception       When the given value-name is not found
+     */
+    public function __get($key)
+    {
+        if (!array_key_exists($key, $this->values)) {
+            throw new IcingaException(
+                'Cannot access non-existent session value "%s"',
+                $key
+            );
+        }
+
+        return $this->get($key);
+    }
+
+    /**
+     * Return whether the given session value is set
+     *
+     * @param   string  $key    The value's name
+     * @return  bool
+     */
+    public function __isset($key)
+    {
+        return isset($this->values[$key]);
+    }
+
+    /**
+     * Unset the given session value
+     *
+     * @param   string  $key    The value's name
+     */
+    public function __unset($key)
+    {
+        $this->delete($key);
+    }
+
+    /**
+     * Setter for session values
+     *
+     * @param   string      $key        Name of value
+     * @param   mixed       $value      Value to set
+     *
+     * @return  $this
+     */
+    public function set($key, $value)
+    {
+        $this->values[$key] = $value;
+
+        if (in_array($key, $this->removed, true)) {
+            unset($this->removed[array_search($key, $this->removed, true)]);
+        }
+
+        return $this;
+    }
+
+    public function setByRef($key, &$value)
+    {
+        $this->values[$key] = & $value;
+
+        if (in_array($key, $this->removed, true)) {
+            unset($this->removed[array_search($key, $this->removed, true)]);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Getter for session values
+     *
+     * @param   string  $key        Name of the value to return
+     * @param   mixed   $default    Default value to return
+     *
+     * @return  mixed
+     */
+    public function get($key, $default = null)
+    {
+        return isset($this->values[$key]) ? $this->values[$key] : $default;
+    }
+
+    public function & getByRef($key, $default = null)
+    {
+        $value = $default;
+        if (isset($this->values[$key])) {
+            $value = & $this->values[$key];
+        }
+
+        return $value;
+    }
+
+    /**
+     * Delete the given value from the session
+     *
+     * @param   string  $key    The value's name
+     */
+    public function delete($key)
+    {
+        $this->removed[] = $key;
+        unset($this->values[$key]);
+    }
+
+    /**
+     * Getter for all session values
+     *
+     * @return array
+     */
+    public function getAll()
+    {
+        return $this->values;
+    }
+
+    /**
+     * Put an array into the session
+     *
+     * @param   array   $values     Values to set
+     * @param   bool    $overwrite  Overwrite existing values
+     */
+    public function setAll(array $values, $overwrite = false)
+    {
+        foreach ($values as $key => $value) {
+            if ($this->get($key, $value) !== $value && !$overwrite) {
+                continue;
+            }
+            $this->set($key, $value);
+        }
+    }
+
+    /**
+     * Return whether the session namespace has been changed
+     *
+     * @return  bool
+     */
+    public function hasChanged()
+    {
+        return false === empty($this->values) || false === empty($this->removed);
+    }
+
+    /**
+     * Clear all values from the session namespace
+     */
+    public function clear()
+    {
+        $this->values = array();
+        $this->removed = array();
+    }
+}
diff --git a/library/Icinga/Web/StyleSheet.php b/library/Icinga/Web/StyleSheet.php
new file mode 100644
index 0000000..65cbb97
--- /dev/null
+++ b/library/Icinga/Web/StyleSheet.php
@@ -0,0 +1,342 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Exception;
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Authentication\Auth;
+use Icinga\Exception\IcingaException;
+
+/**
+ * Send CSS for Web 2 and all loaded modules to the client
+ */
+class StyleSheet
+{
+    /**
+     * The name of the default theme
+     *
+     * @var string
+     */
+    const DEFAULT_THEME = 'Icinga';
+
+    /**
+     * The name of the default theme mode
+     *
+     * @var string
+     */
+    const DEFAULT_MODE = 'none';
+
+    /**
+     * The themes that are compatible with the default theme
+     *
+     * @var array
+     */
+    const THEME_WHITELIST = [
+        'colorblind',
+        'high-contrast',
+        'Winter'
+    ];
+
+    /**
+     * Sequence that signals that a theme supports light mode
+     *
+     * @var string
+     */
+    const LIGHT_MODE_IDENTIFIER = '@light-mode:';
+
+    /**
+     * Array of core LESS files Web 2 sends to the client
+     *
+     * @var string[]
+     */
+    protected static $lessFiles = [
+        '../application/fonts/fontello-ifont/css/ifont-embedded.css',
+        'css/vendor/normalize.css',
+        'css/icinga/base.less',
+        'css/icinga/badges.less',
+        'css/icinga/configmenu.less',
+        'css/icinga/mixins.less',
+        'css/icinga/grid.less',
+        'css/icinga/nav.less',
+        'css/icinga/main.less',
+        'css/icinga/animation.less',
+        'css/icinga/layout.less',
+        'css/icinga/layout-structure.less',
+        'css/icinga/menu.less',
+        'css/icinga/tabs.less',
+        'css/icinga/forms.less',
+        'css/icinga/setup.less',
+        'css/icinga/widgets.less',
+        'css/icinga/login.less',
+        'css/icinga/about.less',
+        'css/icinga/controls.less',
+        'css/icinga/dev.less',
+        'css/icinga/spinner.less',
+        'css/icinga/compat.less',
+        'css/icinga/print.less',
+        'css/icinga/responsive.less',
+        'css/icinga/modal.less',
+        'css/icinga/audit.less',
+        'css/icinga/health.less',
+        'css/icinga/php-diff.less',
+        'css/icinga/pending-migration.less',
+    ];
+
+    /**
+     * Application instance
+     *
+     * @var \Icinga\Application\EmbeddedWeb
+     */
+    protected $app;
+
+    /** @var string[] Pre-compiled CSS files */
+    protected $cssFiles = [];
+
+    /**
+     * Less compiler
+     *
+     * @var LessCompiler
+     */
+    protected $lessCompiler;
+
+    /**
+     * Path to the public directory
+     *
+     * @var string
+     */
+    protected $pubPath;
+
+    /**
+     * Create the StyleSheet
+     */
+    public function __construct()
+    {
+        $app = Icinga::app();
+        $this->app = $app;
+        $this->lessCompiler = new LessCompiler();
+        $this->pubPath = $app->getBaseDir('public');
+        $this->collect();
+    }
+
+    /**
+     * Collect Web 2 and module LESS files and add them to the LESS compiler
+     */
+    protected function collect()
+    {
+        foreach ($this->app->getLibraries() as $library) {
+            foreach ($library->getCssAssets() as $lessFile) {
+                if (substr($lessFile, -4) === '.css') {
+                    $this->cssFiles[] = $lessFile;
+                } else {
+                    $this->lessCompiler->addLessFile($lessFile);
+                }
+            }
+        }
+
+        foreach (self::$lessFiles as $lessFile) {
+            $this->lessCompiler->addLessFile($this->pubPath . '/' . $lessFile);
+        }
+
+        $mm = $this->app->getModuleManager();
+
+        foreach ($mm->getLoadedModules() as $moduleName => $module) {
+            if ($module->hasCss()) {
+                foreach ($module->getCssFiles() as $lessFilePath) {
+                    $this->lessCompiler->addModuleLessFile($moduleName, $lessFilePath);
+                }
+            }
+        }
+
+        $themingConfig = $this->app->getConfig()->getSection('themes');
+        $defaultTheme = $themingConfig->get('default');
+        $theme = null;
+        if ($defaultTheme !== null && $defaultTheme !== self::DEFAULT_THEME) {
+            $theme = $defaultTheme;
+        }
+
+        if (! (bool) $themingConfig->get('disabled', false)) {
+            $auth = Auth::getInstance();
+            if ($auth->isAuthenticated()) {
+                $userTheme = $auth->getUser()->getPreferences()->getValue('icingaweb', 'theme');
+                if ($userTheme !== null) {
+                    $theme = $userTheme;
+                }
+            }
+        }
+
+        if ($themePath = self::getThemeFile($theme)) {
+            if ($this->app->isCli() || is_file($themePath) && is_readable($themePath)) {
+                $this->lessCompiler->setTheme($themePath);
+            } else {
+                $themePath = null;
+                Logger::warning(sprintf(
+                    'Theme "%s" set by user "%s" has not been found.',
+                    $theme,
+                    ($user = Auth::getInstance()->getUser()) !== null ? $user->getUsername() : 'anonymous'
+                ));
+            }
+        }
+
+        if (! $themePath || in_array($theme, self::THEME_WHITELIST, true)) {
+            $this->lessCompiler->addLessFile($this->pubPath . '/css/icinga/login-orbs.less');
+        }
+
+        $mode = 'none';
+        if ($user = Auth::getInstance()->getUser()) {
+            $file = $themePath !== null ? @file_get_contents($themePath) : false;
+            if (! $file || strpos($file, self::LIGHT_MODE_IDENTIFIER) !== false) {
+                $mode = $user->getPreferences()->getValue('icingaweb', 'theme_mode', self::DEFAULT_MODE);
+            }
+        }
+
+        $this->lessCompiler->setThemeMode($this->pubPath . '/css/modes/'. $mode . '.less');
+    }
+
+    /**
+     * Get all collected files
+     *
+     * @return string[]
+     */
+    protected function getFiles(): array
+    {
+        return array_merge($this->cssFiles, $this->lessCompiler->getLessFiles());
+    }
+
+    /**
+     * Get the stylesheet for PDF export
+     *
+     * @return  $this
+     */
+    public static function forPdf()
+    {
+        $styleSheet = new self();
+        $styleSheet->lessCompiler->setTheme(null);
+        $styleSheet->lessCompiler->setThemeMode($styleSheet->pubPath . '/css/modes/none.less');
+        $styleSheet->lessCompiler->addLessFile($styleSheet->pubPath . '/css/pdf/pdfprint.less');
+        // TODO(el): Caching
+        return $styleSheet;
+    }
+
+    /**
+     * Render the stylesheet
+     *
+     * @param   bool    $minified   Whether to compress the stylesheet
+     *
+     * @return  string              CSS
+     */
+    public function render($minified = false)
+    {
+        if ($minified) {
+            $this->lessCompiler->compress();
+        }
+
+        $css = '';
+        foreach ($this->cssFiles as $cssFile) {
+            $css .= file_get_contents($cssFile);
+        }
+
+        return $css . $this->lessCompiler->render();
+    }
+
+    /**
+     * Send the stylesheet to the client
+     *
+     * Does not cache the stylesheet if the HTTP header Cache-Control or Pragma is set to no-cache.
+     *
+     * @param   bool    $minified   Whether to compress the stylesheet
+     */
+    public static function send($minified = false)
+    {
+        $styleSheet = new self();
+
+        $request = $styleSheet->app->getRequest();
+        $response = $styleSheet->app->getResponse();
+        $response->setHeader('Cache-Control', 'private,no-cache,must-revalidate', true);
+
+        $noCache = $request->getHeader('Cache-Control') === 'no-cache' || $request->getHeader('Pragma') === 'no-cache';
+
+        $collectedFiles = $styleSheet->getFiles();
+        if (! $noCache && FileCache::etagMatchesFiles($collectedFiles)) {
+            $response
+                ->setHttpResponseCode(304)
+                ->sendHeaders();
+            return;
+        }
+
+        $etag = FileCache::etagForFiles($collectedFiles);
+
+        $response->setHeader('ETag', $etag, true)
+            ->setHeader('Content-Type', 'text/css', true);
+
+        $cacheFile = 'icinga-' . $etag . ($minified ? '.min' : '') . '.css';
+        $cache = FileCache::instance();
+
+        if (! $noCache && $cache->has($cacheFile)) {
+            $response->setBody($cache->get($cacheFile));
+        } else {
+            $css = $styleSheet->render($minified);
+            $response->setBody($css);
+            $cache->store($cacheFile, $css);
+        }
+
+        $response->sendResponse();
+    }
+
+    /**
+     * Render the stylesheet
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            Logger::error($e);
+            return IcingaException::describe($e);
+        }
+    }
+
+    /**
+     * Get the path to the current LESS theme file
+     *
+     * @param $theme
+     *
+     * @return  string|null Return null if self::DEFAULT_THEME is set as theme, path otherwise
+     */
+    public static function getThemeFile($theme)
+    {
+        $app = Icinga::app();
+
+        if ($theme && $theme !== self::DEFAULT_THEME) {
+            if (Hook::has('ThemeLoader')) {
+                try {
+                    $path = Hook::first('ThemeLoader')->getThemeFile($theme);
+                } catch (Exception $e) {
+                    Logger::error('Failed to call ThemeLoader hook: %s', $e);
+                    $path = null;
+                }
+
+                if ($path !== null) {
+                    return $path;
+                }
+            }
+
+            if (($pos = strpos($theme, '/')) !== false) {
+                $moduleName = substr($theme, 0, $pos);
+                $theme = substr($theme, $pos + 1);
+                if ($app->getModuleManager()->hasLoaded($moduleName)) {
+                    $module = $app->getModuleManager()->getModule($moduleName);
+
+                    return $module->getCssDir() . '/themes/' . $theme . '.less';
+                }
+            } else {
+                return $app->getBaseDir('public') . '/css/themes/' . $theme . '.less';
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/library/Icinga/Web/Url.php b/library/Icinga/Web/Url.php
new file mode 100644
index 0000000..c90ca48
--- /dev/null
+++ b/library/Icinga/Web/Url.php
@@ -0,0 +1,806 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Icinga;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Data\Filter\Filter;
+
+/**
+ * Url class that provides convenient access to parameters, allows to modify query parameters and
+ * returns Urls reflecting all changes made to the url and to the parameters.
+ *
+ * Direct instantiation is prohibited and should be done either with @see Url::fromRequest() or
+ * @see Url::fromPath()
+ */
+class Url
+{
+    /**
+     * Whether this url points to an external resource
+     *
+     * @var bool
+     */
+    protected $external;
+
+    /**
+     * An array of all parameters stored in this Url
+     *
+     * @var UrlParams
+     */
+    protected $params;
+
+    /**
+     * The site anchor after the '#'
+     *
+     * @var string
+     */
+    protected $anchor = '';
+
+    /**
+     * The relative path of this Url, without query parameters
+     *
+     * @var string
+     */
+    protected $path = '';
+
+    /**
+     * The basePath of this Url
+     *
+     * @var string
+     */
+    protected $basePath;
+
+    /**
+     * The host of this Url
+     *
+     * @var string
+     */
+    protected $host;
+
+    /**
+     * The port of this Url
+     *
+     * @var string
+     */
+    protected $port;
+
+    /**
+     * The scheme of this Url
+     *
+     * @var string
+     */
+    protected $scheme;
+
+    /**
+     * The username passed with this Url
+     *
+     * @var string
+     */
+    protected $username;
+
+    /**
+     * The password passed with this Url
+     *
+     * @var string
+     */
+    protected $password;
+
+    protected function __construct()
+    {
+        $this->params = UrlParams::fromQueryString(''); // TODO: ::create()
+    }
+
+    /**
+     * Create a new Url class representing the current request
+     *
+     * If $params are given, those will be added to the request's parameters
+     * and overwrite any existing parameters
+     *
+     * @param   UrlParams|array $params     Parameters that should additionally be considered for the url
+     * @param   Request         $request    A request to use instead of the default one
+     *
+     * @return  static
+     */
+    public static function fromRequest($params = array(), $request = null)
+    {
+        if ($request === null) {
+            $request = static::getRequest();
+        }
+
+        $url = new static();
+        $url->setPath(ltrim($request->getPathInfo(), '/'));
+
+        // $urlParams = UrlParams::fromQueryString($request->getQuery());
+        if (isset($_SERVER['QUERY_STRING'])) {
+            $urlParams = UrlParams::fromQueryString($_SERVER['QUERY_STRING']);
+        } else {
+            $urlParams = UrlParams::fromQueryString('');
+            foreach ($request->getQuery() as $k => $v) {
+                $urlParams->set($k, $v);
+            }
+        }
+
+        foreach ($params as $k => $v) {
+            $urlParams->set($k, $v);
+        }
+        $url->setParams($urlParams);
+        $url->setBasePath($request->getBaseUrl());
+        return $url;
+    }
+
+    /**
+     * Return a request object that should be used for determining the URL
+     *
+     * @return  Request
+     */
+    protected static function getRequest()
+    {
+        $app = Icinga::app();
+        if ($app->isCli()) {
+            throw new ProgrammingError(
+                'Url::fromRequest and Url::fromPath are currently not supported for CLI operations'
+            );
+        } else {
+            return $app->getRequest();
+        }
+    }
+
+    /**
+     * Create a new Url class representing the given url
+     *
+     * If $params are given, those will be added to the urls parameters
+     * and overwrite any existing parameters
+     *
+     * @param   string          $url        The string representation of the url to parse
+     * @param   array           $params     An array of parameters that should additionally be considered for the url
+     * @param   Request         $request    A request to use instead of the default one
+     *
+     * @return  static
+     */
+    public static function fromPath($url, array $params = array(), $request = null)
+    {
+        if ($request === null) {
+            $request = static::getRequest();
+        }
+
+        if (! is_string($url)) {
+            throw new ProgrammingError(
+                'url %s is not a string',
+                var_export($url, true)
+            );
+        }
+
+        $urlObject = new static();
+
+        if ($url === '#') {
+            $urlObject->setPath($url);
+            return $urlObject;
+        }
+
+        $urlParts = parse_url($url);
+        if (isset($urlParts['scheme']) && (
+            $urlParts['scheme'] !== $request->getScheme()
+            || (isset($urlParts['host']) && $urlParts['host'] !== $request->getServer('SERVER_NAME'))
+            || (isset($urlParts['port']) && $urlParts['port'] != $request->getServer('SERVER_PORT')))
+        ) {
+            $urlObject->setIsExternal();
+        }
+
+        if (isset($urlParts['path'])) {
+            $urlPath = $urlParts['path'];
+            if ($urlPath && $urlPath[0] === '/') {
+                if ($urlObject->isExternal() || isset($urlParts['user'])) {
+                    $urlPath = ltrim($urlPath, '/');
+                } else {
+                    $requestBaseUrl = $request->getBaseUrl();
+                    if ($requestBaseUrl && $requestBaseUrl !== '/' && strpos($urlPath, $requestBaseUrl) === 0) {
+                        $urlPath = ltrim(substr($urlPath, strlen($requestBaseUrl)), '/');
+                        $urlObject->setBasePath($requestBaseUrl);
+                    }
+                }
+            } elseif (! $urlObject->isExternal()) {
+                $urlObject->setBasePath($request->getBaseUrl());
+            }
+
+            $urlObject->setPath($urlPath);
+        } elseif (! $urlObject->isExternal()) {
+            $urlObject->setBasePath($request->getBaseUrl());
+        }
+
+        // TODO: This has been used by former filter implementation, remove it:
+        if (isset($urlParts['query'])) {
+            $params = UrlParams::fromQueryString($urlParts['query'])->mergeValues($params);
+        }
+        if (isset($urlParts['fragment'])) {
+            $urlObject->setAnchor($urlParts['fragment']);
+        }
+
+        if (isset($urlParts['user']) || $urlObject->isExternal()) {
+            if (isset($urlParts['user'])) {
+                $urlObject->setUsername($urlParts['user']);
+            }
+            if (isset($urlParts['host'])) {
+                $urlObject->setHost($urlParts['host']);
+            }
+            if (isset($urlParts['port'])) {
+                $urlObject->setPort($urlParts['port']);
+            }
+            if (isset($urlParts['scheme'])) {
+                $urlObject->setScheme($urlParts['scheme']);
+            }
+            if (isset($urlParts['pass'])) {
+                $urlObject->setPassword($urlParts['pass']);
+            }
+        }
+
+        $urlObject->setParams($params);
+        return $urlObject;
+    }
+
+    /**
+     * Create a new filter that needs to fullfill the base filter and the optional filter (if it exists)
+     *
+     * @param string    $url        The url to apply the new filter to
+     * @param Filter    $filter     The base filter
+     * @param ?Filter    $optional   The optional filter
+     *
+     * @return static               The altered URL containing the new filter
+     * @throws ProgrammingError
+     */
+    public static function urlAddFilterOptional($url, $filter, $optional)
+    {
+        $url = static::fromPath($url);
+        $f = $filter;
+        if (isset($optional)) {
+            $f = Filter::matchAll($filter, $optional);
+        }
+        return $url->setQueryString($f->toQueryString());
+    }
+
+    /**
+     * Add the given filter to the current filter of the URL
+     *
+     * @param   Filter $and
+     *
+     * @return  $this
+     */
+    public function addFilter($and)
+    {
+        $this->setQueryString(
+            Filter::fromQueryString($this->getQueryString())
+                ->andFilter($and)
+                ->toQueryString()
+        );
+        return $this;
+    }
+
+    /**
+     * Set the basePath for this url
+     *
+     * @param   string  $basePath     New basePath of this url
+     *
+     * @return  $this
+     */
+    public function setBasePath($basePath)
+    {
+        $this->basePath = rtrim($basePath, '/ ');
+        return $this;
+    }
+
+    /**
+     * Return the basePath set for this url
+     *
+     * @return  string
+     */
+    public function getBasePath()
+    {
+        return $this->basePath;
+    }
+
+    /**
+     * Set the host for this url
+     *
+     * @param   string  $host     New host of this Url
+     *
+     * @return  $this
+     */
+    public function setHost($host)
+    {
+        $this->host = $host;
+        return $this;
+    }
+
+    /**
+     * Return the host set for this url
+     *
+     * @return  string
+     */
+    public function getHost()
+    {
+        return $this->host;
+    }
+
+    /**
+     * Set the port for this url
+     *
+     * @param   string  $port    New port of this url
+     *
+     * @return  $this
+     */
+    public function setPort($port)
+    {
+        $this->port = $port;
+        return $this;
+    }
+
+    /**
+     * Return the port set for this url
+     *
+     * @return  string
+     */
+    public function getPort()
+    {
+        return $this->port;
+    }
+
+    /**
+     * Set the scheme for this url
+     *
+     * @param   string  $scheme    The scheme used for this url
+     *
+     * @return  $this
+     */
+    public function setScheme($scheme)
+    {
+        $this->scheme = $scheme;
+        return $this;
+    }
+
+    /**
+     * Return the scheme set for this url
+     *
+     * @return  string
+     */
+    public function getScheme()
+    {
+        return $this->scheme;
+    }
+
+    /**
+     * Set the relative path of this url, without query parameters
+     *
+     * @param   string  $path   The path to set
+     *
+     * @return  $this
+     */
+    public function setPath($path)
+    {
+        $this->path = $path;
+        return $this;
+    }
+
+    /**
+     * Return the relative path of this url, without query parameters
+     *
+     * If you want the relative path with query parameters use getRelativeUrl
+     *
+     * @return  string
+     */
+    public function getPath()
+    {
+        return $this->path;
+    }
+
+    /**
+     * Set whether this url points to an external resource
+     *
+     * @param   bool    $state
+     *
+     * @return  $this
+     */
+    public function setIsExternal($state = true)
+    {
+        $this->external = (bool) $state;
+        return $this;
+    }
+
+    /**
+     * Return whether this url points to an external resource
+     *
+     * @return  bool
+     */
+    public function isExternal()
+    {
+        return $this->external;
+    }
+
+    /**
+     * Set the username passed with this url
+     *
+     * @param   string  $username   The username to set
+     *
+     * @return  $this
+     */
+    public function setUsername($username)
+    {
+        $this->username = $username;
+        return $this;
+    }
+
+    /**
+     * Return the username passed with this url
+     *
+     * @return  string
+     */
+    public function getUsername()
+    {
+        return $this->username;
+    }
+
+    /**
+     * Set the username passed with this url
+     *
+     * @param   string  $password   The password to set
+     *
+     * @return  $this
+     */
+    public function setPassword($password)
+    {
+        $this->password = $password;
+        return $this;
+    }
+
+    /**
+     * Return the password passed with this url
+     *
+     * @return  string
+     */
+    public function getPassword()
+    {
+        return $this->password;
+    }
+
+    /**
+     * Return the relative url
+     *
+     * @return  string
+     */
+    public function getRelativeUrl($separator = '&')
+    {
+        $path = $this->buildPathQueryAndFragment($separator);
+        if ($path && $path[0] === '/') {
+            return '';
+        }
+
+        return $path;
+    }
+
+    /**
+     * Return this url's path with its query parameters and fragment as string
+     *
+     * @return  string
+     */
+    protected function buildPathQueryAndFragment($querySeparator)
+    {
+        $anchor = $this->getAnchor();
+        if ($anchor) {
+            $anchor = '#' . $anchor;
+        }
+
+        $query = $this->getQueryString($querySeparator);
+        if ($query) {
+            $query = '?' . $query;
+        }
+
+        return $this->getPath() . $query . $anchor;
+    }
+
+    public function setQueryString($queryString)
+    {
+        $this->params = UrlParams::fromQueryString($queryString);
+        return $this;
+    }
+
+    public function getQueryString($separator = null)
+    {
+        return $this->params->toString($separator);
+    }
+
+    /**
+     * Return the absolute url with query parameters as a string
+     *
+     * @return  string
+     */
+    public function getAbsoluteUrl($separator = '&')
+    {
+        $path = $this->buildPathQueryAndFragment($separator);
+        if ($path && ($path === '#' || $path[0] === '/')) {
+            return $path;
+        }
+
+        $basePath = $this->getBasePath();
+        if (! $basePath) {
+            $basePath = '/';
+        }
+
+        if ($this->getUsername() || $this->isExternal()) {
+            $urlString = '';
+            if ($this->getScheme()) {
+                $urlString .= $this->getScheme() . '://';
+            }
+            if ($this->getPassword()) {
+                $urlString .= $this->getUsername() . ':' . $this->getPassword() . '@';
+            } elseif ($this->getUsername()) {
+                $urlString .= $this->getUsername() . '@';
+            }
+            if ($this->getHost()) {
+                $urlString .= $this->getHost();
+            }
+            if ($this->getPort()) {
+                $urlString .= ':' . $this->getPort();
+            }
+
+            return $urlString . $basePath . ($basePath !== '/' && $path ? '/' : '') . $path;
+        } else {
+            return $basePath . ($basePath !== '/' && $path ? '/' : '') . $path;
+        }
+    }
+
+    /**
+     * Add a set of parameters to the query part if the keys don't exist yet
+     *
+     * @param   array   $params     The parameters to add
+     *
+     * @return  $this
+     */
+    public function addParams(array $params)
+    {
+        foreach ($params as $k => $v) {
+            $this->params->add($k, $v);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set and overwrite the given params if one if the same key already exists
+     *
+     * @param   array   $params     The parameters to set
+     *
+     * @return  $this
+     */
+    public function overwriteParams(array $params)
+    {
+        foreach ($params as $k => $v) {
+            $this->params->set($k, $v);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Overwrite the parameters used in the query part
+     *
+     * @param   UrlParams|array   $params     The new parameters to use for the query part
+     *
+     * @return  $this
+     */
+    public function setParams($params)
+    {
+        if ($params instanceof UrlParams) {
+            $this->params = $params;
+        } elseif (is_array($params)) {
+            $urlParams = UrlParams::fromQueryString('');
+            foreach ($params as $k => $v) {
+                $urlParams->set($k, $v);
+            }
+            $this->params = $urlParams;
+        } else {
+            throw new ProgrammingError(
+                'Url params needs to be either an array or an UrlParams instance'
+            );
+        }
+        return $this;
+    }
+
+    /**
+     * Return all parameters that will be used in the query part
+     *
+     * @return  UrlParams   An instance of UrlParam containing all parameters
+     */
+    public function getParams()
+    {
+        return $this->params;
+    }
+
+    /**
+     * Return true if a urls' query parameter exists, otherwise false
+     *
+     * @param   string  $param    The url parameter name to check
+     *
+     * @return  bool
+     */
+    public function hasParam($param)
+    {
+        return $this->params->has($param);
+    }
+
+    /**
+     * Return a url's query parameter if it exists, otherwise $default
+     *
+     * @param   string  $param      A query parameter name to return if existing
+     * @param   mixed   $default    A value to return when the parameter doesn't exist
+     *
+     * @return  mixed
+     */
+    public function getParam($param, $default = null)
+    {
+        return $this->params->get($param, $default);
+    }
+
+    /**
+     * Set a single parameter, overwriting any existing one with the same name
+     *
+     * @param   string               $param      The query parameter name
+     * @param   array|string|bool    $value      An array or string to set as the parameter value
+     *
+     * @return  $this
+     */
+    public function setParam($param, $value = true)
+    {
+        $this->params->set($param, $value);
+        return $this;
+    }
+
+    /**
+     * Set the url anchor-part
+     *
+     * @param   string  $anchor     The site's anchor string without the '#'
+     *
+     * @return  $this
+     */
+    public function setAnchor($anchor)
+    {
+        $this->anchor = $anchor;
+        return $this;
+    }
+
+    /**
+     * Return the url anchor-part
+     *
+     * @return  string  The site's anchor string without the '#'
+     */
+    public function getAnchor()
+    {
+        return $this->anchor;
+    }
+
+    /**
+     * Remove provided key (if string) or keys (if array of string) from the query parameter array
+     *
+     * @param   string|array    $keyOrArrayOfKeys   An array of strings or a string representing the key(s)
+     *                                              of the parameters to be removed
+     * @return  $this
+     */
+    public function remove($keyOrArrayOfKeys)
+    {
+        $this->params->remove($keyOrArrayOfKeys);
+        return $this;
+    }
+
+    /**
+     * Shift a query parameter from this URL if it exists, otherwise $default
+     *
+     * @param string $param   Parameter name
+     * @param mixed  $default Default value in case $param does not exist
+     *
+     * @return  mixed
+     */
+    public function shift($param, $default = null)
+    {
+        return $this->params->shift($param, $default);
+    }
+
+    /**
+     * Whether the given URL matches this URL object
+     *
+     * This does an exact match, parameters MUST be in the same order
+     *
+     * @param Url|string $url the URL to compare against
+     *
+     * @return bool whether the URL matches
+     */
+    public function matches($url)
+    {
+        if (! $url instanceof static) {
+            $url = static::fromPath($url);
+        }
+        return (string) $url === (string) $this;
+    }
+
+    /**
+     * Return a copy of this url without the parameter given
+     *
+     * The argument can be either a single query parameter name or an array of parameter names to
+     * remove from the query list
+     *
+     * @param   string|array    $keyOrArrayOfKeys   A single string or an array containing parameter names
+     *
+     * @return  static
+     */
+    public function getUrlWithout($keyOrArrayOfKeys)
+    {
+        return $this->without($keyOrArrayOfKeys);
+    }
+
+    public function without($keyOrArrayOfKeys)
+    {
+        $url = clone($this);
+        $url->remove($keyOrArrayOfKeys);
+        return $url;
+    }
+
+    /**
+     * Return a copy of this url with the given parameter(s)
+     *
+     * The argument can be either a single query parameter name or an array of parameter names to
+     * remove from the query list
+     *
+     * @param string|array $param  A single string or an array containing parameter names
+     * @param mixed        $values an optional values array
+     *
+     * @return static
+     */
+    public function with($param, $values = null)
+    {
+        $url = clone($this);
+        $url->params->mergeValues($param, $values);
+        return $url;
+    }
+
+    /**
+     * Return a copy of this url with only the given parameter(s)
+     *
+     * The argument can be either a single query parameter name or
+     * an array of parameter names to keep on on the query
+     *
+     * @param string|array $keyOrArrayOfKeys
+     *
+     * @return static
+     */
+    public function onlyWith($keyOrArrayOfKeys)
+    {
+        if (! is_array($keyOrArrayOfKeys)) {
+            $keyOrArrayOfKeys = [$keyOrArrayOfKeys];
+        }
+
+        $url = clone $this;
+        foreach ($url->getParams()->toArray(false) as $param => $value) {
+            if (is_int($param)) {
+                $param = $value;
+            }
+
+            if (! in_array($param, $keyOrArrayOfKeys, true)) {
+                $url->remove($param);
+            }
+        }
+
+        return $url;
+    }
+
+    public function __clone()
+    {
+        $this->params = clone $this->params;
+    }
+
+    /**
+     * Alias for @see Url::getAbsoluteUrl()
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        return htmlspecialchars($this->getAbsoluteUrl(), ENT_COMPAT | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8', true);
+    }
+}
diff --git a/library/Icinga/Web/UrlParams.php b/library/Icinga/Web/UrlParams.php
new file mode 100644
index 0000000..2265235
--- /dev/null
+++ b/library/Icinga/Web/UrlParams.php
@@ -0,0 +1,433 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Exception\MissingParameterException;
+
+class UrlParams
+{
+    protected $separator = '&';
+
+    protected $params = array();
+
+    protected $index = array();
+
+    public function isEmpty()
+    {
+        return empty($this->index);
+    }
+
+    public function setSeparator($separator)
+    {
+        $this->separator = $separator;
+        return $this;
+    }
+
+    /**
+     * Get the given parameter
+     *
+     * Returns the last URL param if defined multiple times, $default if not
+     * given at all
+     *
+     * @param string                $param   The parameter you're interested in
+     * @param string|int|bool|null  $default An optional default value
+     *
+     * @return mixed
+     */
+    public function get($param, $default = null)
+    {
+        if (! $this->has($param)) {
+            return $default;
+        }
+
+        return rawurldecode($this->params[ end($this->index[$param]) ][ 1 ]);
+    }
+
+    /**
+     * Require a parameter
+     *
+     * @param   string  $name               Name of the parameter
+     * @param   bool    $strict             Whether the parameter's value must not be the empty string
+     *
+     * @return  mixed
+     *
+     * @throws  MissingParameterException   If the parameter was not given
+     */
+    public function getRequired($name, $strict = true)
+    {
+        if ($this->has($name)) {
+            $value = $this->get($name);
+            if (! $strict || strlen($value) > 0) {
+                return $value;
+            }
+        }
+        $e = new MissingParameterException(t('Required parameter \'%s\' missing'), $name);
+        $e->setParameter($name);
+        throw $e;
+    }
+
+    /**
+     * Get all instances of the given parameter
+     *
+     * Returns an array containing all values defined for a given parameter,
+     * $default if none.
+     *
+     * @param string $param   The parameter you're interested in
+     * @param array  $default An optional default value
+     *
+     * @return mixed
+     */
+    public function getValues($param, $default = array())
+    {
+        if (! $this->has($param)) {
+            return $default;
+        }
+
+        $ret = array();
+        foreach ($this->index[$param] as $key) {
+            $ret[] = rawurldecode($this->params[$key][1]);
+        }
+        return $ret;
+    }
+
+    /**
+     * Whether the given parameter exists
+     *
+     * Returns true if such a parameter has been defined, false otherwise.
+     *
+     * @param string $param The parameter you're interested in
+     *
+     * @return boolean
+     */
+    public function has($param)
+    {
+        return array_key_exists($param, $this->index);
+    }
+
+    /**
+     * Get and remove the given parameter
+     *
+     * Returns the last URL param if defined multiple times, $default if not
+     * given at all. The parameter will be removed from this object.
+     *
+     * @param string $param   The parameter you're interested in
+     * @param string $default An optional default value
+     *
+     * @return mixed
+     */
+    public function shift($param = null, $default = null)
+    {
+        if ($param === null) {
+            if (empty($this->params)) {
+                return $default;
+            }
+            $ret = array_shift($this->params);
+            $ret[0] = rawurldecode($ret[0]);
+            $ret[1] = rawurldecode($ret[1]);
+        } else {
+            if (! $this->has($param)) {
+                return $default;
+            }
+            $key = reset($this->index[$param]);
+            $ret = rawurldecode($this->params[$key][1]);
+            unset($this->params[$key]);
+        }
+
+        $this->reIndexAll();
+        return $ret;
+    }
+
+    /**
+     * Require and remove a parameter
+     *
+     * @param   string  $name               Name of the parameter
+     * @param   bool    $strict             Whether the parameter's value must not be the empty string
+     *
+     * @return  mixed
+     *
+     * @throws  MissingParameterException   If the parameter was not given
+     */
+    public function shiftRequired($name, $strict = true)
+    {
+        if ($this->has($name)) {
+            $value = $this->get($name);
+            if (! $strict || strlen($value) > 0) {
+                $this->shift($name);
+                return $value;
+            }
+        }
+        $e = new MissingParameterException(t('Required parameter \'%s\' missing'), $name);
+        $e->setParameter($name);
+        throw $e;
+    }
+
+    public function addEncoded($param, $value = true)
+    {
+        $this->params[] = array($param, $this->cleanupValue($value));
+        $this->indexLastOne();
+        return $this;
+    }
+
+    protected function urlEncode($value)
+    {
+        return rawurlencode($value instanceof Url ? $value->getAbsoluteUrl() : (string) $value);
+    }
+
+    /**
+     * Add the given parameter with the given value
+     *
+     * This will add the given parameter, regardless of whether it already
+     * exists.
+     *
+     * @param string       $param The parameter you're interested in
+     * @param string|bool  $value The value to be stored
+     *
+     * @return $this
+     */
+    public function add($param, $value = true)
+    {
+        return $this->addEncoded($this->urlEncode($param), $this->urlEncode($value));
+    }
+
+    /**
+     * Adds a list of parameters
+     *
+     * This may be used with either a list of values for a single parameter or
+     * with a list of parameter / value pairs.
+     *
+     * @param string|array $param Parameter name or param/value list
+     * @param ?array       $value The value to be stored
+     *
+     * @return $this
+     */
+    public function addValues($param, $values = null)
+    {
+        if ($values === null && is_array($param)) {
+            foreach ($param as $k => $v) {
+                $this->add($k, $v);
+            }
+        } else {
+            foreach ($values as $value) {
+                $this->add($param, $value);
+            }
+        }
+
+        return $this;
+    }
+
+    protected function clearValues()
+    {
+        $this->params = array();
+        $this->index = array();
+    }
+
+    public function mergeValues($param, $values = null)
+    {
+        if ($values === null && is_array($param)) {
+            foreach ($param as $k => $v) {
+                $this->set($k, $v);
+            }
+        } else {
+            if (! is_array($values)) {
+                $values = array($values);
+            }
+            foreach ($values as $value) {
+                $this->set($param, $value);
+            }
+        }
+
+        return $this;
+    }
+
+    public function setValues($param, $values = null)
+    {
+        $this->clearValues();
+        return $this->addValues($param, $values);
+    }
+
+    /**
+     * Add the given parameter with the given value in front of all other values
+     *
+     * This will add the given parameter in front of all others, regardless of
+     * whether it already exists.
+     *
+     * @param string $param The parameter you're interested in
+     * @param string $value The value to be stored
+     *
+     * @return $this
+     */
+    public function unshift($param, $value)
+    {
+        array_unshift($this->params, array($this->urlEncode($param), $this->urlEncode($value)));
+        $this->reIndexAll();
+        return $this;
+    }
+
+    /**
+     * Set the given parameter with the given value
+     *
+     * This will set the given parameter, and override eventually existing ones.
+     *
+     * @param string $param The parameter you want to set
+     * @param string $value The value to be stored
+     *
+     * @return $this
+     */
+    public function set($param, $value)
+    {
+        if (! $this->has($param)) {
+            return $this->add($param, $value);
+        }
+
+        while (count($this->index[$param]) > 1) {
+            $remove = array_pop($this->index[$param]);
+            unset($this->params[$remove]);
+        }
+
+        $this->params[$this->index[$param][0]] = array(
+            $this->urlEncode($param),
+            $this->urlEncode($this->cleanupValue($value))
+        );
+        $this->reIndexAll();
+
+        return $this;
+    }
+
+    public function remove($param)
+    {
+        $changed = false;
+
+        if (! is_array($param)) {
+            $param = array($param);
+        }
+
+        foreach ($param as $p) {
+            if ($this->has($p)) {
+                foreach ($this->index[$p] as $key) {
+                    unset($this->params[$key]);
+                }
+                $changed = true;
+            }
+        }
+
+        if ($changed) {
+            $this->reIndexAll();
+        }
+
+        return $this;
+    }
+
+    public function without($param)
+    {
+        $params = clone $this;
+        return $params->remove($param);
+    }
+
+    // TODO: push, pop?
+
+    protected function indexLastOne()
+    {
+        end($this->params);
+        $key = key($this->params);
+        $param = $this->params[$key][0];
+        $this->addParamToIndex($param, $key);
+    }
+
+    protected function addParamToIndex($param, $key)
+    {
+        if (! $this->has($param)) {
+            $this->index[$param] = array();
+        }
+        $this->index[$param][] = $key;
+    }
+
+    protected function reIndexAll()
+    {
+        $this->index = array();
+        $this->params = array_values($this->params);
+        foreach ($this->params as $key => & $param) {
+            $this->addParamToIndex($param[0], $key);
+        }
+    }
+
+    protected function cleanupValue($value)
+    {
+        return is_bool($value) ? $value : (string) $value;
+    }
+
+    protected function parseQueryString($queryString)
+    {
+        $parts = preg_split('~&~', $queryString, -1, PREG_SPLIT_NO_EMPTY);
+        foreach ($parts as $part) {
+            $this->parseQueryStringPart($part);
+        }
+    }
+
+    protected function parseQueryStringPart($part)
+    {
+        if (strpos($part, '=') === false) {
+            $this->addEncoded($part, true);
+        } else {
+            list($key, $val) = preg_split('/=/', $part, 2);
+            $this->addEncoded($key, $val);
+        }
+    }
+
+    /**
+     * Return the parameters of this url as sequenced or associative array
+     *
+     * @param   bool    $sequenced
+     *
+     * @return  array
+     */
+    public function toArray($sequenced = true)
+    {
+        if ($sequenced) {
+            return $this->params;
+        }
+
+        $params = array();
+        foreach ($this->params as $param) {
+            if ($param[1] === true) {
+                $params[] = $param[0];
+            } else {
+                $params[$param[0]] = $param[1];
+            }
+        }
+
+        return $params;
+    }
+
+    public function toString($separator = null)
+    {
+        if ($separator === null) {
+            $separator = $this->separator;
+        }
+        $parts = array();
+        foreach ($this->params as $p) {
+            if ($p[1] === true) {
+                $parts[] = $p[0];
+            } else {
+                $parts[] = $p[0] . '=' . $p[1];
+            }
+        }
+        return implode($separator, $parts);
+    }
+
+    public function __toString()
+    {
+        return $this->toString();
+    }
+
+    public static function fromQueryString($queryString = null)
+    {
+        if ($queryString === null) {
+            $queryString = isset($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '';
+        }
+        $params = new static();
+        $params->parseQueryString($queryString);
+
+        return $params;
+    }
+}
diff --git a/library/Icinga/Web/UserAgent.php b/library/Icinga/Web/UserAgent.php
new file mode 100644
index 0000000..71c1a8b
--- /dev/null
+++ b/library/Icinga/Web/UserAgent.php
@@ -0,0 +1,86 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web;
+
+/**
+ * Class UserAgent
+ *
+ * This class helps to get user agent information like OS type and browser name
+ *
+ * @package Icinga\Web
+ */
+class UserAgent
+{
+    /**
+     * $_SERVER['HTTP_USER_AGENT'] output string
+     *
+     * @var string|null
+     */
+    private $agent;
+
+    public function __construct($agent = null)
+    {
+        $this->agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;
+
+        if ($agent) {
+            $this->agent = $agent->http_user_agent;
+        }
+    }
+
+    /**
+     * Return $_SERVER['HTTP_USER_AGENT'] output string of given or current device
+     *
+     * @return string
+     */
+    public function getAgent()
+    {
+        return $this->agent;
+    }
+
+    /**
+     * Get Browser name
+     *
+     * @return string Browser name or unknown if not found
+     */
+    public function getBrowser()
+    {
+        // key => regex value
+        $browsers = [
+            "Internet Explorer"    => "/MSIE(.*)/i",
+            "Seamonkey"            => "/Seamonkey(.*)/i",
+            "MS Edge"              => "/Edg(.*)/i",
+            "Opera"                => "/Opera(.*)/i",
+            "Opera Browser"        => "/OPR(.*)/i",
+            "Chromium"             => "/Chromium(.*)/i",
+            "Firefox"              => "/Firefox(.*)/i",
+            "Google Chrome"        => "/Chrome(.*)/i",
+            "Safari"               => "/Safari(.*)/i"
+        ];
+        //TODO find a way to return also the version of the browser
+        foreach ($browsers as $browser => $regex) {
+            if (preg_match($regex, $this->agent)) {
+                return $browser;
+            }
+        }
+
+        return 'unknown';
+    }
+
+    /**
+     * Get Operating system information
+     *
+     * @return string os information
+     */
+    public function getOs()
+    {
+        // get string before the first appearance of ')'
+        $device = strstr($this->agent, ')', true);
+        if (! $device) {
+            return 'unknown';
+        }
+
+        // return string after the first appearance of '('
+        return  substr($device, strpos($device, '(') + 1);
+    }
+}
diff --git a/library/Icinga/Web/View.php b/library/Icinga/Web/View.php
new file mode 100644
index 0000000..2c80d1d
--- /dev/null
+++ b/library/Icinga/Web/View.php
@@ -0,0 +1,254 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Closure;
+use Icinga\Application\Icinga;
+use ipl\I18n\Translation;
+use Zend_View_Abstract;
+use Icinga\Authentication\Auth;
+use Icinga\Exception\ProgrammingError;
+
+/**
+ * Icinga view
+ *
+ * @method Url href($path = null, $params = null) {
+ *  @param  Url|string|null $path
+ *  @param  string[]|null   $params
+ * }
+ *
+ * @method Url url($path = null, $params = null) {
+ *  @param  Url|string|null $path
+ *  @param  string[]|null   $params
+ * }
+ *
+ * @method Url qlink($title, $url, $params = null, $properties = null, $escape = true) {
+ *  @param  string          $title
+ *  @param  Url|string|null $url
+ *  @param  string[]|null   $params
+ *  @param  string[]|null   $properties
+ *  @param  bool            $escape
+ * }
+ *
+ * @method string img($url, $params = null, array $properties = array()) {
+ *  @param  Url|string|null $url
+ *  @param  string[]|null   $params
+ *  @param  string[]        $properties
+ * }
+ *
+ * @method string icon($img, $title = null, array $properties = array()) {
+ *  @param  string      $img
+ *  @param  string|null $title
+ *  @param  string[]    $properties
+ * }
+ *
+ * @method string propertiesToString($properties) {
+ *  @param  string[]    $properties
+ * }
+ *
+ * @method string attributeToString($key, $value) {
+ *  @param  string  $key
+ *  @param  string  $value
+ * }
+ */
+class View extends Zend_View_Abstract
+{
+    use Translation;
+
+    /**
+     * Charset to be used - we only support UTF-8
+     */
+    const CHARSET = 'UTF-8';
+
+    /**
+     * Registered helper functions
+     */
+    private $helperFunctions = array();
+
+    /**
+     * Authentication manager
+     *
+     * @var Auth|null
+     */
+    private $auth;
+
+    /**
+     * Create a new view object
+     *
+     * @param array $config
+     * @see Zend_View_Abstract::__construct
+     */
+    public function __construct($config = array())
+    {
+        $config['helperPath']['Icinga\\Web\\View\\Helper\\'] = Icinga::app()->getLibraryDir('Icinga/Web/View/Helper');
+
+        parent::__construct($config);
+    }
+
+    /**
+     * Initialize the view
+     *
+     * @see Zend_View_Abstract::init
+     */
+    public function init()
+    {
+        $this->loadGlobalHelpers();
+    }
+
+    /**
+     * Escape the given value top be safely used in view scripts
+     *
+     * @param  ?string $var  The output to be escaped
+     * @return string
+     */
+    public function escape($var)
+    {
+        return htmlspecialchars($var ?? '', ENT_COMPAT | ENT_SUBSTITUTE | ENT_HTML5, self::CHARSET, true);
+    }
+
+    /**
+     * Whether a specific helper (closure) has been registered
+     *
+     * @param  string $name The desired function name
+     * @return boolean
+     */
+    public function hasHelperFunction($name)
+    {
+        return array_key_exists($name, $this->helperFunctions);
+    }
+
+    /**
+     * Add a new helper function
+     *
+     * @param  string  $name     The desired function name
+     * @param  Closure $function An anonymous function
+     * @return $this
+     */
+    public function addHelperFunction($name, Closure $function)
+    {
+        if ($this->hasHelperFunction($name)) {
+            throw new ProgrammingError(
+                'Cannot assign the same helper function twice: "%s"',
+                $name
+            );
+        }
+
+        $this->helperFunctions[$name] = $function;
+        return $this;
+    }
+
+    /**
+     * Set or overwrite a helper function
+     *
+     * @param   string  $name
+     * @param   Closure $function
+     *
+     * @return  $this
+     */
+    public function setHelperFunction($name, Closure $function)
+    {
+        $this->helperFunctions[$name] = $function;
+        return $this;
+    }
+
+    /**
+     * Drop a helper function
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     */
+    public function dropHelperFunction($name)
+    {
+        unset($this->helperFunctions[$name]);
+        return $this;
+    }
+
+    /**
+     * Call a helper function
+     *
+     * @param  string  $name The desired function name
+     * @param  Array   $args Function arguments
+     * @return mixed
+     */
+    public function callHelperFunction($name, $args)
+    {
+        return call_user_func_array(
+            $this->helperFunctions[$name],
+            $args
+        );
+    }
+
+    /**
+     * Load helpers
+     */
+    private function loadGlobalHelpers()
+    {
+        $pattern = dirname(__FILE__) . '/View/helpers/*.php';
+        $files = glob($pattern);
+        foreach ($files as $file) {
+            require_once $file;
+        }
+    }
+
+    /**
+     * Get the authentication manager
+     *
+     * @return Auth
+     */
+    public function Auth()
+    {
+        if ($this->auth === null) {
+            $this->auth = Auth::getInstance();
+        }
+        return $this->auth;
+    }
+
+    /**
+     * Whether the current user has the given permission
+     *
+     * @param   string  $permission Name of the permission
+     *
+     * @return  bool
+     */
+    public function hasPermission($permission)
+    {
+        return $this->Auth()->hasPermission($permission);
+    }
+
+    /**
+     * Use to include the view script in a scope that only allows public
+     * members.
+     *
+     * @return mixed
+     *
+     * @see Zend_View_Abstract::run
+     */
+    protected function _run()
+    {
+        foreach ($this->getVars() as $k => $v) {
+            // Exporting global variables to view scripts:
+            $$k = $v;
+        }
+
+        include func_get_arg(0);
+    }
+
+    /**
+     * Accesses a helper object from within a script
+     *
+     * @param string $name
+     * @param array  $args
+     *
+     * @return string
+     */
+    public function __call($name, $args)
+    {
+        if ($this->hasHelperFunction($name)) {
+            return $this->callHelperFunction($name, $args);
+        } else {
+            return parent::__call($name, $args);
+        }
+    }
+}
diff --git a/library/Icinga/Web/View/AppHealth.php b/library/Icinga/Web/View/AppHealth.php
new file mode 100644
index 0000000..c66ca05
--- /dev/null
+++ b/library/Icinga/Web/View/AppHealth.php
@@ -0,0 +1,89 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Application\Hook\HealthHook;
+use ipl\Html\FormattedString;
+use ipl\Html\HtmlElement;
+use ipl\Html\Table;
+use ipl\Web\Common\BaseTarget;
+use ipl\Web\Widget\Link;
+use Traversable;
+
+class AppHealth extends Table
+{
+    use BaseTarget;
+
+    protected $defaultAttributes = ['class' => ['app-health', 'common-table', 'table-row-selectable']];
+
+    /** @var Traversable */
+    protected $data;
+
+    public function __construct(Traversable $data)
+    {
+        $this->data = $data;
+
+        $this->setBaseTarget('_next');
+    }
+
+    protected function assemble()
+    {
+        foreach ($this->data as $row) {
+            $this->add(Table::tr([
+                Table::th(HtmlElement::create('span', ['class' => [
+                    'ball',
+                    'ball-size-xl',
+                    $this->getStateClass($row->state)
+                ]])),
+                Table::td([
+                    new HtmlElement('header', null, FormattedString::create(
+                        t('%s by %s is %s', '<check> by <module> is <state-text>'),
+                        $row->url
+                            ? new Link(HtmlElement::create('span', null, $row->name), $row->url)
+                            : HtmlElement::create('span', null, $row->name),
+                        HtmlElement::create('span', null, $row->module),
+                        HtmlElement::create('span', null, $this->getStateText($row->state))
+                    )),
+                    HtmlElement::create('section', null, $row->message)
+                ])
+            ]));
+        }
+    }
+
+    protected function getStateClass($state)
+    {
+        if ($state === null) {
+            $state = HealthHook::STATE_UNKNOWN;
+        }
+
+        switch ($state) {
+            case HealthHook::STATE_OK:
+                return 'state-ok';
+            case HealthHook::STATE_WARNING:
+                return 'state-warning';
+            case HealthHook::STATE_CRITICAL:
+                return 'state-critical';
+            case HealthHook::STATE_UNKNOWN:
+                return 'state-unknown';
+        }
+    }
+
+    protected function getStateText($state)
+    {
+        if ($state === null) {
+            $state = t('UNKNOWN');
+        }
+
+        switch ($state) {
+            case HealthHook::STATE_OK:
+                return t('OK');
+            case HealthHook::STATE_WARNING:
+                return t('WARNING');
+            case HealthHook::STATE_CRITICAL:
+                return t('CRITICAL');
+            case HealthHook::STATE_UNKNOWN:
+                return t('UNKNOWN');
+        }
+    }
+}
diff --git a/library/Icinga/Web/View/Helper/IcingaCheckbox.php b/library/Icinga/Web/View/Helper/IcingaCheckbox.php
new file mode 100644
index 0000000..07cf01f
--- /dev/null
+++ b/library/Icinga/Web/View/Helper/IcingaCheckbox.php
@@ -0,0 +1,30 @@
+<?php
+/* Icinga Web 2 | (c) 2019 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\View\Helper;
+
+class IcingaCheckbox extends \Zend_View_Helper_FormCheckbox
+{
+    public function icingaCheckbox($name, $value = null, $attribs = null, array $checkedOptions = null)
+    {
+        if (! isset($attribs['id'])) {
+            $attribs['id'] = $this->view->protectId('icingaCheckbox_' . $name);
+        }
+
+        $attribs['class'] = (isset($attribs['class']) ? $attribs['class'] . ' ' : '') . 'sr-only';
+        $html = parent::formCheckbox($name, $value, $attribs, $checkedOptions);
+
+        $class = 'toggle-switch';
+        if (isset($attribs['disabled'])) {
+            $class .= ' disabled';
+        }
+
+        return $html
+            . '<label for="'
+            . $attribs['id']
+            . '" aria-hidden="true"'
+            . ' class="'
+            . $class
+            . '"><span class="toggle-slider"></span></label>';
+    }
+}
diff --git a/library/Icinga/Web/View/PrivilegeAudit.php b/library/Icinga/Web/View/PrivilegeAudit.php
new file mode 100644
index 0000000..fcb4083
--- /dev/null
+++ b/library/Icinga/Web/View/PrivilegeAudit.php
@@ -0,0 +1,622 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Authentication\Role;
+use Icinga\Forms\Security\RoleForm;
+use Icinga\Util\StringHelper;
+use ipl\Html\Attributes;
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\HtmlElement;
+use ipl\Html\HtmlString;
+use ipl\Html\Text;
+use ipl\Stdlib\Filter;
+use ipl\Web\Common\BaseTarget;
+use ipl\Web\Filter\QueryString;
+use ipl\Web\Url;
+use ipl\Web\Widget\Icon;
+use ipl\Web\Widget\Link;
+
+class PrivilegeAudit extends BaseHtmlElement
+{
+    use BaseTarget;
+
+    /** @var string */
+    const UNRESTRICTED_PERMISSION = 'unrestricted';
+
+    protected $tag = 'ul';
+
+    protected $defaultAttributes = ['class' => 'privilege-audit'];
+
+    /** @var Role[] */
+    protected $roles;
+
+    public function __construct(array $roles)
+    {
+        $this->roles = $roles;
+        $this->setBaseTarget('_next');
+    }
+
+    protected function auditPermission($permission)
+    {
+        $grantedBy = [];
+        $refusedBy = [];
+        foreach ($this->roles as $role) {
+            if ($permission === self::UNRESTRICTED_PERMISSION) {
+                if ($role->isUnrestricted()) {
+                    $grantedBy[] = $role->getName();
+                }
+            } elseif ($role->denies($permission)) {
+                $refusedBy[] = $role->getName();
+            } elseif ($role->grants($permission, false, false)) {
+                $grantedBy[] = $role->getName();
+            }
+        }
+
+        $header = new HtmlElement('summary');
+        if (! empty($refusedBy)) {
+            $header->add([
+                new Icon('times-circle', ['class' => 'refused']),
+                count($refusedBy) > 2
+                    ? sprintf(
+                        tp(
+                            'Refused by %s and %s as well as one other',
+                            'Refused by %s and %s as well as %d others',
+                            count($refusedBy) - 2
+                        ),
+                        $refusedBy[0],
+                        $refusedBy[1],
+                        count($refusedBy) - 2
+                    )
+                    : sprintf(
+                        tp('Refused by %s', 'Refused by %s and %s', count($refusedBy)),
+                        ...$refusedBy
+                    )
+            ]);
+        } elseif (! empty($grantedBy)) {
+            $header->add([
+                new Icon('check-circle', ['class' => 'granted']),
+                count($grantedBy) > 2
+                    ? sprintf(
+                        tp(
+                            'Granted by %s and %s as well as one other',
+                            'Granted by %s and %s as well as %d others',
+                            count($grantedBy) - 2
+                        ),
+                        $grantedBy[0],
+                        $grantedBy[1],
+                        count($grantedBy) - 2
+                    )
+                    : sprintf(
+                        tp('Granted by %s', 'Granted by %s and %s', count($grantedBy)),
+                        ...$grantedBy
+                    )
+             ]);
+        } else {
+            $header->add([new Icon('minus-circle'), t('Not granted or refused by any role')]);
+        }
+
+        $vClass = null;
+        $rolePaths = [];
+        foreach (array_reverse($this->roles) as $role) {
+            if (! in_array($role->getName(), $refusedBy, true) && ! in_array($role->getName(), $grantedBy, true)) {
+                continue;
+            }
+
+            /** @var Role[] $rolesReversed */
+            $rolesReversed = [];
+
+            do {
+                array_unshift($rolesReversed, $role);
+            } while (($role = $role->getParent()) !== null);
+
+            $path = new HtmlElement('ol');
+
+            $class = null;
+            $setInitiator = false;
+            foreach ($rolesReversed as $role) {
+                $granted = false;
+                $refused = false;
+                $icon = new Icon('minus-circle');
+                if ($permission === self::UNRESTRICTED_PERMISSION) {
+                    if ($role->isUnrestricted()) {
+                        $granted = true;
+                        $icon = new Icon('check-circle', ['class' => 'granted']);
+                    }
+                } elseif ($role->denies($permission, true)) {
+                    $refused = true;
+                    $icon = new Icon('times-circle', ['class' => 'refused']);
+                } elseif ($role->grants($permission, true, false)) {
+                    $granted = true;
+                    $icon = new Icon('check-circle', ['class' => 'granted']);
+                }
+
+                $connector = null;
+                if ($role->getParent() !== null) {
+                    $connector = HtmlElement::create('li', ['class' => ['connector', $class]]);
+                    if ($setInitiator) {
+                        $setInitiator = false;
+                        $connector->getAttributes()->add('class', 'initiator');
+                    }
+
+                    $path->prependHtml($connector);
+                }
+
+                $path->prependHtml(new HtmlElement('li', Attributes::create([
+                    'class' => ['role', $class],
+                    'title' => $role->getName()
+                ]), new Link([$icon, $role->getName()], Url::fromPath('role/edit', ['role' => $role->getName()]))));
+
+                if ($refused) {
+                    $setInitiator = $class !== 'refused';
+                    $class = 'refused';
+                } elseif ($granted) {
+                    $setInitiator = $class === null;
+                    $class = $class ?: 'granted';
+                }
+            }
+
+            if ($vClass === null || $vClass === 'granted') {
+                $vClass = $class;
+            }
+
+            array_unshift($rolePaths, $path->prepend([
+                empty($rolePaths) ? null : HtmlElement::create('li', ['class' => ['vertical-line', $vClass]]),
+                new HtmlElement('li', Attributes::create(['class' => [
+                    'connector',
+                    $class,
+                    $setInitiator ? 'initiator' : null
+                ]]))
+            ]));
+        }
+
+        if (empty($rolePaths)) {
+            return [
+                empty($refusedBy) ? (empty($grantedBy) ? null : true) : false,
+                new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'inheritance-paths']),
+                    $header->setTag('div')
+                )
+            ];
+        }
+
+        return [
+            empty($refusedBy) ? (empty($grantedBy) ? null : true) : false,
+            HtmlElement::create('details', [
+                'class' => ['collapsible', 'inheritance-paths'],
+                'data-no-persistence' => true,
+                'open' => getenv('ICINGAWEB_EXPORT_FORMAT') === 'pdf'
+            ], [
+                $header->addAttributes(['class' => 'collapsible-control']),
+                $rolePaths
+            ])
+        ];
+    }
+
+    protected function auditRestriction($restriction)
+    {
+        $restrictedBy = [];
+        $restrictions = [];
+        foreach ($this->roles as $role) {
+            if ($role->isUnrestricted()) {
+                $restrictedBy = [];
+                $restrictions = [];
+                break;
+            }
+
+            foreach ($this->collectRestrictions($role, $restriction) as $role => $roleRestriction) {
+                $restrictedBy[] = $role;
+                $restrictions[] = $roleRestriction;
+            }
+        }
+
+        $header = new HtmlElement('summary');
+        if (! empty($restrictedBy)) {
+            $header->add([
+                new Icon('filter', ['class' => 'restricted']),
+                count($restrictedBy) > 2
+                    ? sprintf(
+                        tp(
+                            'Restricted by %s and %s as well as one other',
+                            'Restricted by %s and %s as well as %d others',
+                            count($restrictedBy) - 2
+                        ),
+                        $restrictedBy[0]->getName(),
+                        $restrictedBy[1]->getName(),
+                        count($restrictedBy) - 2
+                    )
+                    : sprintf(
+                        tp('Restricted by %s', 'Restricted by %s and %s', count($restrictedBy)),
+                        ...array_map(function ($role) {
+                            return $role->getName();
+                        }, $restrictedBy)
+                    )
+            ]);
+        } else {
+            $header->add([new Icon('filter'), t('Not restricted by any role')]);
+        }
+
+        $roles = [];
+        if (! empty($restrictions) && count($restrictions) > 1) {
+            list($combinedRestrictions, $combinedLinks) = $this->createRestrictionLinks($restriction, $restrictions);
+            $roles[] = HtmlElement::create('li', null, [
+                new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'flex-overflow']),
+                    HtmlElement::create('span', [
+                        'class' => 'role',
+                        'title' => t('All roles combined')
+                    ], join(' | ', array_map(function ($role) {
+                        return $role->getName();
+                    }, $restrictedBy))),
+                    HtmlElement::create('code', ['class' => 'restriction'], $combinedRestrictions)
+                ),
+                $combinedLinks ? new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'previews']),
+                    HtmlElement::create('em', null, t('Previews:')),
+                    $combinedLinks
+                ) : null
+            ]);
+        }
+
+        foreach ($restrictedBy as $role) {
+            list($roleRestriction, $restrictionLinks) = $this->createRestrictionLinks(
+                $restriction,
+                [$role->getRestrictions($restriction)]
+            );
+
+            $roles[] = HtmlElement::create('li', null, [
+                new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'flex-overflow']),
+                    new Link($role->getName(), Url::fromPath('role/edit', ['role' => $role->getName()]), [
+                        'class' => 'role',
+                        'title' => $role->getName()
+                    ]),
+                    HtmlElement::create('code', ['class' => 'restriction'], $roleRestriction)
+                ),
+                $restrictionLinks ? new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'previews']),
+                    HtmlElement::create('em', null, t('Previews:')),
+                    $restrictionLinks
+                ) : null
+            ]);
+        }
+
+        if (empty($roles)) {
+            return [
+                ! empty($restrictedBy),
+                new HtmlElement(
+                    'div',
+                    Attributes::create(['class' => 'restrictions']),
+                    $header->setTag('div')
+                )
+            ];
+        }
+
+        return [
+            ! empty($restrictedBy),
+            new HtmlElement(
+                'details',
+                Attributes::create([
+                    'class' => ['collapsible', 'restrictions'],
+                    'data-no-persistence' => true,
+                    'open' => getenv('ICINGAWEB_EXPORT_FORMAT') === 'pdf'
+                ]),
+                $header->addAttributes(['class' => 'collapsible-control']),
+                new HtmlElement('ul', null, ...$roles)
+            )
+        ];
+    }
+
+    protected function assemble()
+    {
+        list($permissions, $restrictions) = RoleForm::collectProvidedPrivileges();
+        list($wildcardState, $wildcardAudit) = $this->auditPermission('*');
+        list($unrestrictedState, $unrestrictedAudit) = $this->auditPermission(self::UNRESTRICTED_PERMISSION);
+
+        $this->addHtml(new HtmlElement(
+            'li',
+            null,
+            new HtmlElement(
+                'details',
+                Attributes::create([
+                    'class' => ['collapsible', 'privilege-section'],
+                    'open' => ($wildcardState || $unrestrictedState) && getenv('ICINGAWEB_EXPORT_FORMAT') === 'pdf'
+                ]),
+                new HtmlElement(
+                    'summary',
+                    Attributes::create(['class' => [
+                        'collapsible-control', // Helps JS, improves performance a bit
+                    ]]),
+                    new HtmlElement('span', null, Text::create(t('Administrative Privileges'))),
+                    HtmlElement::create(
+                        'span',
+                        ['class' => 'audit-preview'],
+                        $wildcardState || $unrestrictedState
+                            ? new Icon('check-circle', ['class' => 'granted'])
+                            : null
+                    ),
+                    new Icon('angles-down', ['class' => 'collapse-icon']),
+                    new Icon('angles-left', ['class' => 'expand-icon'])
+                ),
+                new HtmlElement(
+                    'ol',
+                    Attributes::create(['class' => 'privilege-list']),
+                    new HtmlElement(
+                        'li',
+                        null,
+                        HtmlElement::create('p', ['class' => 'privilege-label'], t('Administrative Access')),
+                        HtmlElement::create('div', ['class' => 'spacer']),
+                        $wildcardAudit
+                    ),
+                    new HtmlElement(
+                        'li',
+                        null,
+                        HtmlElement::create('p', ['class' => 'privilege-label'], t('Unrestricted Access')),
+                        HtmlElement::create('div', ['class' => 'spacer']),
+                        $unrestrictedAudit
+                    )
+                )
+            )
+        ));
+
+        $privilegeSources = array_unique(array_merge(array_keys($permissions), array_keys($restrictions)));
+        foreach ($privilegeSources as $source) {
+            $anythingGranted = false;
+            $anythingRefused = false;
+            $anythingRestricted = false;
+
+            $permissionList = new HtmlElement('ol', Attributes::create(['class' => 'privilege-list']));
+            foreach (isset($permissions[$source]) ? $permissions[$source] : [] as $permission => $metaData) {
+                list($permissionState, $permissionAudit) = $this->auditPermission($permission);
+                if ($permissionState !== null) {
+                    if ($permissionState) {
+                        $anythingGranted = true;
+                    } else {
+                        $anythingRefused = true;
+                    }
+                }
+
+                $permissionList->addHtml(new HtmlElement(
+                    'li',
+                    null,
+                    HtmlElement::create(
+                        'p',
+                        ['class' => 'privilege-label'],
+                        isset($metaData['label'])
+                            ? $metaData['label']
+                            : array_map(function ($segment) {
+                                return $segment[0] === '/' ? [
+                                    // Adds a zero-width char after each slash to help browsers break onto newlines
+                                    new HtmlString('/&#8203;'),
+                                    HtmlElement::create('span', ['class' => 'no-wrap'], substr($segment, 1))
+                                ] : HtmlElement::create('em', null, $segment);
+                            }, preg_split(
+                                '~(/[^/]+)~',
+                                $permission,
+                                -1,
+                                PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY
+                            ))
+                    ),
+                    new HtmlElement('div', Attributes::create(['class' => 'spacer'])),
+                    $permissionAudit
+                ));
+            }
+
+            $restrictionList = new HtmlElement('ol', Attributes::create(['class' => 'privilege-list']));
+            foreach (isset($restrictions[$source]) ? $restrictions[$source] : [] as $restriction => $metaData) {
+                list($restrictionState, $restrictionAudit) = $this->auditRestriction($restriction);
+                if ($restrictionState) {
+                    $anythingRestricted = true;
+                }
+
+                $restrictionList->addHtml(new HtmlElement(
+                    'li',
+                    null,
+                    HtmlElement::create(
+                        'p',
+                        ['class' => 'privilege-label'],
+                        isset($metaData['label'])
+                            ? $metaData['label']
+                            : array_map(function ($segment) {
+                                return $segment[0] === '/' ? [
+                                    // Adds a zero-width char after each slash to help browsers break onto newlines
+                                    new HtmlString('/&#8203;'),
+                                    HtmlElement::create('span', ['class' => 'no-wrap'], substr($segment, 1))
+                                ] : HtmlElement::create('em', null, $segment);
+                            }, preg_split(
+                                '~(/[^/]+)~',
+                                $restriction,
+                                -1,
+                                PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY
+                            ))
+                    ),
+                    new HtmlElement('div', Attributes::create(['class' => 'spacer'])),
+                    $restrictionAudit
+                ));
+            }
+
+            if ($source === 'application') {
+                $label = 'Icinga Web 2';
+            } else {
+                $label = [$source, ' ', HtmlElement::create('em', null, t('Module'))];
+            }
+
+            $this->addHtml(new HtmlElement(
+                'li',
+                null,
+                HtmlElement::create('details', [
+                    'class' => ['collapsible', 'privilege-section'],
+                    'open' => ($anythingGranted || $anythingRefused || $anythingRestricted)
+                        && getenv('ICINGAWEB_EXPORT_FORMAT') === 'pdf'
+                ], [
+                    new HtmlElement(
+                        'summary',
+                        Attributes::create(['class' => [
+                            'collapsible-control', // Helps JS, improves performance a bit
+                        ]]),
+                        HtmlElement::create('span', null, $label),
+                        HtmlElement::create('span', ['class' => 'audit-preview'], [
+                            $anythingGranted ? new Icon('check-circle', ['class' => 'granted']) : null,
+                            $anythingRefused ? new Icon('times-circle', ['class' => 'refused']) : null,
+                            $anythingRestricted ? new Icon('filter', ['class' => 'restricted']) : null
+                        ]),
+                        new Icon('angles-down', ['class' => 'collapse-icon']),
+                        new Icon('angles-left', ['class' => 'expand-icon'])
+                    ),
+                    $permissionList->isEmpty() ? null : [
+                        HtmlElement::create('h4', null, t('Permissions')),
+                        $permissionList
+                    ],
+                    $restrictionList->isEmpty() ? null : [
+                        HtmlElement::create('h4', null, t('Restrictions')),
+                        $restrictionList
+                    ]
+                ])
+            ));
+        }
+    }
+
+    private function collectRestrictions(Role $role, $restrictionName)
+    {
+        do {
+            $restriction = $role->getRestrictions($restrictionName);
+            if ($restriction) {
+                yield $role => $restriction;
+            }
+        } while (($role = $role->getParent()) !== null);
+    }
+
+    private function createRestrictionLinks($restrictionName, array $restrictions)
+    {
+        // TODO: Remove this hardcoded mess. Do this based on the restriction's meta data
+        switch ($restrictionName) {
+            case 'icingadb/filter/objects':
+                $filterString = join('|', $restrictions);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/hosts',
+                        Url::fromPath('icingadb/hosts')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/services',
+                        Url::fromPath('icingadb/services')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/hostgroups',
+                        Url::fromPath('icingadb/hostgroups')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/servicegroups',
+                        Url::fromPath('icingadb/servicegroups')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            case 'icingadb/filter/hosts':
+                $filterString = join('|', $restrictions);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/hosts',
+                        Url::fromPath('icingadb/hosts')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/services',
+                        Url::fromPath('icingadb/services')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            case 'icingadb/filter/services':
+                $filterString = join('|', $restrictions);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'icingadb/services',
+                        Url::fromPath('icingadb/services')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            case 'monitoring/filter/objects':
+                $filterString = join('|', $restrictions);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'monitoring/list/hosts',
+                        Url::fromPath('monitoring/list/hosts')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'monitoring/list/services',
+                        Url::fromPath('monitoring/list/services')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'monitoring/list/hostgroups',
+                        Url::fromPath('monitoring/list/hostgroups')->setQueryString($filterString)
+                    )),
+                    new HtmlElement('li', null, new Link(
+                        'monitoring/list/servicegroups',
+                        Url::fromPath('monitoring/list/servicegroups')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            case 'application/share/users':
+                $filter = Filter::any();
+                foreach ($restrictions as $roleRestriction) {
+                    $userNames = StringHelper::trimSplit($roleRestriction);
+                    foreach ($userNames as $userName) {
+                        $filter->add(Filter::equal('user_name', $userName));
+                    }
+                }
+
+                $filterString = QueryString::render($filter);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'user/list',
+                        Url::fromPath('user/list')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            case 'application/share/groups':
+                $filter = Filter::any();
+                foreach ($restrictions as $roleRestriction) {
+                    $groupNames = StringHelper::trimSplit($roleRestriction);
+                    foreach ($groupNames as $groupName) {
+                        $filter->add(Filter::equal('group_name', $groupName));
+                    }
+                }
+
+                $filterString = QueryString::render($filter);
+                $list = new HtmlElement(
+                    'ul',
+                    Attributes::create(['class' => 'links']),
+                    new HtmlElement('li', null, new Link(
+                        'group/list',
+                        Url::fromPath('group/list')->setQueryString($filterString)
+                    ))
+                );
+
+                break;
+            default:
+                $filterString = join(', ', $restrictions);
+                $list = null;
+        }
+
+        return [$filterString, $list];
+    }
+}
diff --git a/library/Icinga/Web/View/helpers/format.php b/library/Icinga/Web/View/helpers/format.php
new file mode 100644
index 0000000..4008583
--- /dev/null
+++ b/library/Icinga/Web/View/helpers/format.php
@@ -0,0 +1,72 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Date\DateFormatter;
+use Icinga\Util\Format;
+
+$this->addHelperFunction('format', function () {
+    return Format::getInstance();
+});
+
+$this->addHelperFunction('formatDate', function ($date) {
+    if (! $date) {
+        return '';
+    }
+    return DateFormatter::formatDate($date);
+});
+
+$this->addHelperFunction('formatDateTime', function ($dateTime) {
+    if (! $dateTime) {
+        return '';
+    }
+    return DateFormatter::formatDateTime($dateTime);
+});
+
+$this->addHelperFunction('formatDuration', function ($seconds) {
+    if (! $seconds) {
+        return '';
+    }
+    return DateFormatter::formatDuration($seconds);
+});
+
+$this->addHelperFunction('formatTime', function ($time) {
+    if (! $time) {
+        return '';
+    }
+    return DateFormatter::formatTime($time);
+});
+
+$this->addHelperFunction('timeAgo', function ($time, $timeOnly = false, $requireTime = false) {
+    if (! $time) {
+        return '';
+    }
+    return sprintf(
+        '<span class="relative-time time-ago" title="%s">%s</span>',
+        DateFormatter::formatDateTime($time),
+        DateFormatter::timeAgo($time, $timeOnly, $requireTime)
+    );
+});
+
+$this->addHelperFunction('timeSince', function ($time, $timeOnly = false, $requireTime = false) {
+    if (! $time) {
+        return '';
+    }
+    return sprintf(
+        '<span class="relative-time time-since" title="%s">%s</span>',
+        DateFormatter::formatDateTime($time),
+        DateFormatter::timeSince($time, $timeOnly, $requireTime)
+    );
+});
+
+$this->addHelperFunction('timeUntil', function ($time, $timeOnly = false, $requireTime = false) {
+    if (! $time) {
+        return '';
+    }
+    return sprintf(
+        '<span class="relative-time time-until" title="%s">%s</span>',
+        DateFormatter::formatDateTime($time),
+        DateFormatter::timeUntil($time, $timeOnly, $requireTime)
+    );
+});
diff --git a/library/Icinga/Web/View/helpers/generic.php b/library/Icinga/Web/View/helpers/generic.php
new file mode 100644
index 0000000..bfd3f86
--- /dev/null
+++ b/library/Icinga/Web/View/helpers/generic.php
@@ -0,0 +1,15 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Authentication\Auth;
+use Icinga\Web\Widget;
+
+$this->addHelperFunction('auth', function () {
+    return Auth::getInstance();
+});
+
+$this->addHelperFunction('widget', function ($name, $options = null) {
+    return Widget::create($name, $options);
+});
diff --git a/library/Icinga/Web/View/helpers/string.php b/library/Icinga/Web/View/helpers/string.php
new file mode 100644
index 0000000..b3f667b
--- /dev/null
+++ b/library/Icinga/Web/View/helpers/string.php
@@ -0,0 +1,36 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Util\StringHelper;
+use Icinga\Web\Helper\Markdown;
+
+$this->addHelperFunction('ellipsis', function ($string, $maxLength, $ellipsis = '...') {
+    return StringHelper::ellipsis($string, $maxLength, $ellipsis);
+});
+
+$this->addHelperFunction('nl2br', function ($string) {
+    return nl2br(str_replace(array('\r\n', '\r', '\n'), '<br>', $string), false);
+});
+
+$this->addHelperFunction('markdown', function ($content, $containerAttribs = null) {
+    if (! isset($containerAttribs['class'])) {
+        $containerAttribs['class'] = 'markdown';
+    } else {
+        $containerAttribs['class'] .= ' markdown';
+    }
+
+    return '<section' . $this->propertiesToString($containerAttribs) . '>' . Markdown::text($content) . '</section>';
+});
+
+$this->addHelperFunction('markdownLine', function ($content, $containerAttribs = null) {
+    if (! isset($containerAttribs['class'])) {
+        $containerAttribs['class'] = 'markdown inline';
+    } else {
+        $containerAttribs['class'] .= ' markdown inline';
+    }
+
+    return '<section' . $this->propertiesToString($containerAttribs) . '>' .
+        Markdown::line($content) . '</section>';
+});
diff --git a/library/Icinga/Web/View/helpers/url.php b/library/Icinga/Web/View/helpers/url.php
new file mode 100644
index 0000000..277c237
--- /dev/null
+++ b/library/Icinga/Web/View/helpers/url.php
@@ -0,0 +1,158 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\View;
+
+use Icinga\Web\Url;
+use Icinga\Exception\ProgrammingError;
+
+$view = $this;
+
+$this->addHelperFunction('href', function ($path = null, $params = null) use ($view) {
+    return $view->url($path, $params);
+});
+
+$this->addHelperFunction('url', function ($path = null, $params = null) {
+    if ($path === null) {
+        $url = Url::fromRequest();
+    } elseif ($path instanceof Url) {
+        $url = $path;
+    } else {
+        $url = Url::fromPath($path);
+    }
+
+    if ($params !== null) {
+        if ($url === $path) {
+            $url = clone $url;
+        }
+
+        $url->overwriteParams($params);
+    }
+
+    return $url;
+});
+
+$this->addHelperFunction(
+    'qlink',
+    function ($title, $url, $params = null, $properties = null, $escape = true) use ($view) {
+        $icon = '';
+        if ($properties) {
+            if (array_key_exists('title', $properties) && !array_key_exists('aria-label', $properties)) {
+                $properties['aria-label'] = $properties['title'];
+            }
+
+            if (array_key_exists('icon', $properties)) {
+                $icon = $view->icon($properties['icon']);
+                unset($properties['icon']);
+            }
+
+            if (array_key_exists('img', $properties)) {
+                $icon = $view->img($properties['img']);
+                unset($properties['img']);
+            }
+        }
+
+        return sprintf(
+            '<a href="%s"%s>%s</a>',
+            $view->url($url, $params),
+            $view->propertiesToString($properties),
+            $icon . ($escape ? $view->escape($title) : $title)
+        );
+    }
+);
+
+$this->addHelperFunction('img', function ($url, $params = null, array $properties = array()) use ($view) {
+    if (! array_key_exists('alt', $properties)) {
+        $properties['alt'] = '';
+    }
+
+    $ariaHidden = array_key_exists('aria-hidden', $properties) ? $properties['aria-hidden'] : null;
+    if (array_key_exists('title', $properties)) {
+        if (! array_key_exists('aria-label', $properties) && $ariaHidden !== 'true') {
+            $properties['aria-label'] = $properties['title'];
+        }
+    } elseif ($ariaHidden === null) {
+        $properties['aria-hidden'] = 'true';
+    }
+
+    return sprintf(
+        '<img src="%s"%s />',
+        $view->escape($view->url($url, $params)->getAbsoluteUrl()),
+        $view->propertiesToString($properties)
+    );
+});
+
+$this->addHelperFunction('icon', function ($img, $title = null, array $properties = array()) use ($view) {
+    if (strpos($img, '.') !== false) {
+        if (array_key_exists('class', $properties)) {
+            $properties['class'] .= ' icon';
+        } else {
+            $properties['class'] = 'icon';
+        }
+        if (strpos($img, '/') === false) {
+            return $view->img('img/icons/' . $img, null, $properties);
+        } else {
+            return $view->img($img, null, $properties);
+        }
+    }
+
+    $ariaHidden = array_key_exists('aria-hidden', $properties) ? $properties['aria-hidden'] : null;
+    if ($title !== null) {
+        $properties['role'] = 'img';
+        $properties['title'] = $title;
+
+        if (! array_key_exists('aria-label', $properties) && $ariaHidden !== 'true') {
+            $properties['aria-label'] = $title;
+        }
+    } elseif ($ariaHidden === null) {
+        $properties['aria-hidden'] = 'true';
+    }
+
+    if (isset($properties['class'])) {
+        $properties['class'] .= ' icon-' . $img;
+    } else {
+        $properties['class'] = 'icon-' . $img;
+    }
+
+    return sprintf('<i %s></i>', $view->propertiesToString($properties));
+});
+
+$this->addHelperFunction('propertiesToString', function ($properties) use ($view) {
+    if (empty($properties)) {
+        return '';
+    }
+    $attributes = array();
+
+    foreach ($properties as $key => $val) {
+        if ($key === 'style' && is_array($val)) {
+            if (empty($val)) {
+                continue;
+            }
+            $parts = array();
+            foreach ($val as $k => $v) {
+                $parts[] = "$k: $v";
+            }
+            $val = implode('; ', $parts);
+            continue;
+        }
+
+        $attributes[] = $view->attributeToString($key, $val);
+    }
+    return ' ' . implode(' ', $attributes);
+});
+
+$this->addHelperFunction('attributeToString', function ($key, $value) use ($view) {
+    // TODO: Doublecheck this!
+    if (! preg_match('~^[a-zA-Z0-9-]+$~', $key)) {
+        throw new ProgrammingError(
+            'Trying to set an invalid HTML attribute name: %s',
+            $key
+        );
+    }
+
+    return sprintf(
+        '%s="%s"',
+        $key,
+        $view->escape($value)
+    );
+});
diff --git a/library/Icinga/Web/Widget.php b/library/Icinga/Web/Widget.php
new file mode 100644
index 0000000..48ae7bd
--- /dev/null
+++ b/library/Icinga/Web/Widget.php
@@ -0,0 +1,49 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Widget\AbstractWidget;
+
+/**
+ * Web widgets make things easier for you!
+ *
+ * This class provides nothing but a static factory method for widget creation.
+ * Usually it will not be used directly as there are widget()-helpers available
+ * in your action controllers and view scripts.
+ *
+ * Usage example:
+ * <code>
+ * $tabs = Widget::create('tabs');
+ * </code>
+ *
+ * @copyright  Copyright (c) 2013 Icinga-Web Team <info@icinga.com>
+ * @author     Icinga-Web Team <info@icinga.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU General Public License
+ */
+class Widget
+{
+    /**
+     * Create a new widget
+     *
+     * @param string $name    Widget name
+     * @param array  $options Widget constructor options
+     *
+     * @return AbstractWidget
+     */
+    public static function create($name, $options = array(), $module_name = null)
+    {
+        $class = 'Icinga\\Web\\Widget\\' . ucfirst($name);
+
+        if (! class_exists($class)) {
+            throw new ProgrammingError(
+                'There is no such widget: %s',
+                $name
+            );
+        }
+
+        $widget = new $class($options, $module_name);
+        return $widget;
+    }
+}
diff --git a/library/Icinga/Web/Widget/AbstractWidget.php b/library/Icinga/Web/Widget/AbstractWidget.php
new file mode 100644
index 0000000..1090548
--- /dev/null
+++ b/library/Icinga/Web/Widget/AbstractWidget.php
@@ -0,0 +1,121 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Exception\ProgrammingError;
+use Icinga\Application\Icinga;
+use Exception;
+use Zend_View_Abstract;
+
+/**
+ * Web widgets MUST extend this class
+ *
+ * AbstractWidget implements getters and setters for widget options stored in
+ * the protected options array. If you want to allow options for your own
+ * widget, you have to set a default value (may be null) for each single option
+ * in this array.
+ *
+ * Please have a look at the available widgets in this folder to get a better
+ * idea on what they should look like.
+ *
+ * @copyright  Copyright (c) 2013 Icinga-Web Team <info@icinga.com>
+ * @author     Icinga-Web Team <info@icinga.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU General Public License
+ */
+abstract class AbstractWidget
+{
+    /**
+     * If you are going to access the current view with the view() function,
+     * its instance is stored here for performance reasons.
+     *
+     * @var Zend_View_Abstract
+     */
+    protected static $view;
+
+    // TODO: Should we kick this?
+    protected $properties = array();
+
+    /**
+     * Getter for widget properties
+     *
+     * @param  string $key The option you're interested in
+     *
+     * @throws ProgrammingError for unknown property name
+     *
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        if (array_key_exists($key, $this->properties)) {
+            return $this->properties[$key];
+        }
+
+        throw new ProgrammingError(
+            'Trying to get invalid "%s" property for %s',
+            $key,
+            get_class($this)
+        );
+    }
+
+    /**
+     * Setter for widget properties
+     *
+     * @param  string $key The option you want to set
+     * @param  string $val The new value going to be assigned to this option
+     *
+     * @throws ProgrammingError for unknown property name
+     *
+     * @return mixed
+     */
+    public function __set($key, $val)
+    {
+        if (array_key_exists($key, $this->properties)) {
+            $this->properties[$key] = $val;
+            return;
+        }
+
+        throw new ProgrammingError(
+            'Trying to set invalid "%s" property in %s. Allowed are: %s',
+            $key,
+            get_class($this),
+            empty($this->properties)
+                ? 'none'
+                : implode(', ', array_keys($this->properties))
+        );
+    }
+
+    abstract public function render();
+
+    /**
+     * Access the current view
+     *
+     * Will instantiate a new one if none exists
+     * // TODO: App->getView
+     *
+     * @return Zend_View_Abstract
+     */
+    protected function view()
+    {
+        if (self::$view === null) {
+            self::$view = Icinga::app()->getViewRenderer()->view;
+        }
+
+        return self::$view;
+    }
+
+    /**
+     * Cast this widget to a string. Will call your render() function
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        try {
+            $html = $this->render();
+        } catch (Exception $e) {
+            return htmlspecialchars($e->getMessage());
+        }
+        return (string) $html;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Announcements.php b/library/Icinga/Web/Widget/Announcements.php
new file mode 100644
index 0000000..e0fac77
--- /dev/null
+++ b/library/Icinga/Web/Widget/Announcements.php
@@ -0,0 +1,55 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Icinga;
+use Icinga\Data\Filter\Filter;
+use Icinga\Forms\Announcement\AcknowledgeAnnouncementForm;
+use Icinga\Web\Announcement\AnnouncementCookie;
+use Icinga\Web\Announcement\AnnouncementIniRepository;
+use Icinga\Web\Helper\Markdown;
+
+/**
+ * Render announcements
+ */
+class Announcements extends AbstractWidget
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function render()
+    {
+        $repo = new AnnouncementIniRepository();
+        $etag = $repo->getEtag();
+        $cookie = new AnnouncementCookie();
+        if ($cookie->getEtag() !== $etag) {
+            $cookie->setEtag($etag);
+            $cookie->setNextActive($repo->findNextActive());
+            Icinga::app()->getResponse()->setCookie($cookie);
+        }
+        $acked = array();
+        foreach ($cookie->getAcknowledged() as $hash) {
+            $acked[] = Filter::expression('hash', '!=', $hash);
+        }
+        $acked = Filter::matchAll($acked);
+        $announcements = $repo->findActive();
+        $announcements->applyFilter($acked);
+        if ($announcements->hasResult()) {
+            $html = '<ul role="alert">';
+            foreach ($announcements as $announcement) {
+                $ackForm = new AcknowledgeAnnouncementForm();
+                $ackForm->populate(array('hash' => $announcement->hash));
+                $html .= '<li><div class="message">'
+                    . Markdown::text($announcement->message)
+                    . '</div>'
+                    . $ackForm
+                    . '</li>';
+            }
+            $html .= '</ul>';
+            return $html;
+        }
+        // Force container update on XHR
+        return '<div hidden></div>';
+    }
+}
diff --git a/library/Icinga/Web/Widget/ApplicationStateMessages.php b/library/Icinga/Web/Widget/ApplicationStateMessages.php
new file mode 100644
index 0000000..99d3bb2
--- /dev/null
+++ b/library/Icinga/Web/Widget/ApplicationStateMessages.php
@@ -0,0 +1,74 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Config;
+use Icinga\Application\Hook\ApplicationStateHook;
+use Icinga\Authentication\Auth;
+use Icinga\Forms\AcknowledgeApplicationStateMessageForm;
+use Icinga\Web\ApplicationStateCookie;
+use Icinga\Web\Helper\Markdown;
+
+/**
+ * Render application state messages
+ */
+class ApplicationStateMessages extends AbstractWidget
+{
+    protected function getMessages()
+    {
+        $cookie = new ApplicationStateCookie();
+
+        $acked = array_flip($cookie->getAcknowledgedMessages());
+        $messages = ApplicationStateHook::getAllMessages();
+
+        $active = array_diff_key($messages, $acked);
+
+        return $active;
+    }
+
+    public function render()
+    {
+        $enabled = Auth::getInstance()
+            ->getUser()
+            ->getPreferences()
+            ->getValue('icingaweb', 'show_application_state_messages', 'system');
+
+        if ($enabled === 'system') {
+            $enabled = Config::app()->get('global', 'show_application_state_messages', true);
+        }
+
+        if (! (bool) $enabled) {
+            return '<div hidden></div>';
+        }
+
+        $active = $this->getMessages();
+
+        if (empty($active)) {
+            // Force container update on XHR
+            return '<div hidden></div>';
+        }
+
+        $html = '<div>';
+
+        reset($active);
+
+        $id = key($active);
+        $spec = current($active);
+        $message = array_pop($spec); // We don't use state and timestamp here
+
+
+        $ackForm = new AcknowledgeApplicationStateMessageForm();
+        $ackForm->populate(['id' => $id]);
+
+        $html .= '<section class="markdown">';
+        $html .= Markdown::text($message);
+        $html .= '</section>';
+
+        $html .= $ackForm;
+
+        $html .= '</div>';
+
+        return $html;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Chart/HistoryColorGrid.php b/library/Icinga/Web/Widget/Chart/HistoryColorGrid.php
new file mode 100644
index 0000000..b7b50d0
--- /dev/null
+++ b/library/Icinga/Web/Widget/Chart/HistoryColorGrid.php
@@ -0,0 +1,400 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Chart;
+
+use DateInterval;
+use DateTime;
+use Icinga\Util\Color;
+use Icinga\Util\Csp;
+use Icinga\Web\Widget\AbstractWidget;
+use ipl\Web\Style;
+
+/**
+ * Display a colored grid that visualizes a set of values for each day
+ * on a given time-frame.
+ */
+class HistoryColorGrid extends AbstractWidget
+{
+    const CAL_GROW_INTO_PAST = 'past';
+    const CAL_GROW_INTO_PRESENT = 'present';
+
+    const ORIENTATION_VERTICAL = 'vertical';
+    const ORIENTATION_HORIZONTAL = 'horizontal';
+
+    public $weekFlow = self::CAL_GROW_INTO_PAST;
+    public $orientation = self::ORIENTATION_VERTICAL;
+    public $weekStartMonday = true;
+
+    private $maxValue = 1;
+
+    private $start = null;
+    private $end = null;
+    private $data = array();
+    private $color;
+    public $opacity = 1.0;
+
+    /** @var array<string, array<string, string>> History grid css rulesets */
+    protected $rulesets = [];
+
+    public function __construct($color = '#51e551', $start = null, $end = null)
+    {
+        $this->setColor($color);
+        if (isset($start)) {
+            $this->start = $this->tsToDateStr($start);
+        }
+        if (isset($end)) {
+            $this->end = $this->tsToDateStr($end);
+        }
+    }
+
+    /**
+     * Set the displayed data-set
+     *
+     * @param $events array The history events to display as an array of arrays:
+     *                          value: The value to display
+     *                          caption: The caption on mouse-over
+     *                          url: The url to open on click.
+     */
+    public function setData(array $events)
+    {
+        $this->data = $events;
+        $start = time();
+        $end = time();
+        foreach ($this->data as $entry) {
+            $entry['value'] = intval($entry['value']);
+        }
+        foreach ($this->data as $date => $entry) {
+            $time = strtotime($date);
+            if ($entry['value'] > $this->maxValue) {
+                $this->maxValue = $entry['value'];
+            }
+            if ($time > $end) {
+                $end = $time;
+            }
+            if ($time < $start) {
+                $start = $time;
+            }
+        }
+        if (!isset($this->start)) {
+            $this->start = $this->tsToDateStr($start);
+        }
+        if (!isset($this->end)) {
+            $this->end = $this->tsToDateStr($end);
+        }
+    }
+
+    /**
+     * Set the used color.
+     *
+     * @param $color
+     */
+    public function setColor($color)
+    {
+        $this->color = $color;
+    }
+
+    /**
+     * Set the used opacity
+     *
+     * @param $opacity
+     */
+    public function setOpacity($opacity)
+    {
+        $this->opacity = $opacity;
+    }
+
+    /**
+     * Calculate the color to display for the given value.
+     *
+     * @param $value    integer
+     *
+     * @return string   The color-string to use for this entry.
+     */
+    private function calculateColor($value)
+    {
+        $saturation = $value / $this->maxValue;
+        return Color::changeSaturation($this->color, $saturation);
+    }
+
+    /**
+     * Render the html to display the given $day
+     *
+     * @param $day  string  The day to display YYYY-MM-DD
+     *
+     * @return string   The rendered html
+     */
+    private function renderDay($day)
+    {
+        if (array_key_exists($day, $this->data) && $this->data[$day]['value'] > 0) {
+            $entry = $this->data[$day];
+            $this->rulesets['.grid-day-with-entry-' . $entry['value']] = [
+                'background-color'  => $this->calculateColor($entry['value']),
+                'opacity'           => $this->opacity
+            ];
+
+            return '<a class="grid-day-with-entry-'
+                . $entry['value']
+                . '" '
+                . 'aria-label="' . $entry['caption']
+                . '" '
+                . 'title="' . $entry['caption']
+                . '" '
+                . 'href="'  . $entry['url']
+                . '" '
+                . '"></a>';
+        } else {
+            if (! isset($this->rulesets['.grid-day-no-entry'])) {
+                $this->rulesets['.grid-day-no-entry'] = [
+                    'background-color'  => $this->calculateColor(0),
+                    'opacity'           => $this->opacity
+                ];
+            }
+
+            return '<span class="grid-day-no-entry"' . ' title="No entries for ' . $day . '"></span>';
+        }
+    }
+
+    /**
+     * Render the grid with an horizontal alignment.
+     *
+     * @param array $grid   The values returned from the createGrid function
+     *
+     * @return string   The rendered html
+     */
+    private function renderHorizontal($grid)
+    {
+        $weeks = $grid['weeks'];
+        $months = $grid['months'];
+        $years = $grid['years'];
+        $html = '<table class="historycolorgrid">';
+        $html .= '<tr><th></th>';
+        $old = -1;
+        foreach ($months as $week => $month) {
+            if ($old !== $month) {
+                $old = $month;
+                $txt = $this->monthName($month, $years[$week]);
+            } else {
+                $txt = '';
+            }
+            $html .= '<th>' . $txt . '</th>';
+        }
+        $html .= '</tr>';
+        for ($i = 0; $i < 7; $i++) {
+            $html .= $this->renderWeekdayHorizontal($i, $weeks);
+        }
+        $html .= '</table>';
+        return $html;
+    }
+
+     /**
+     * @param $grid
+     *
+     * @return string
+     */
+    private function renderVertical($grid)
+    {
+        $years = $grid['years'];
+        $weeks = $grid['weeks'];
+        $months = $grid['months'];
+        $html = '<table class="historycolorgrid">';
+        $html .= '<tr>';
+        for ($i = 0; $i < 7; $i++) {
+            $html .= '<th>' . $this->weekdayName($this->weekStartMonday ? $i + 1 : $i) . "</th>";
+        }
+        $html .= '</tr>';
+        $old = -1;
+        foreach ($weeks as $index => $week) {
+            for ($i = 0; $i < 7; $i++) {
+                if (array_key_exists($i, $week)) {
+                    $html .= '<td>' . $this->renderDay($week[$i]) . '</td>';
+                } else {
+                    $html .= '<td></td>';
+                }
+            }
+            if ($old !== $months[$index]) {
+                $old = $months[$index];
+                $txt = $this->monthName($old, $years[$index]);
+            } else {
+                $txt = '';
+            }
+            $html .=  '<td class="weekday">' . $txt . '</td></tr>';
+        }
+        $html .= '</table>';
+        return $html;
+    }
+
+    /**
+     * Render the row for the given weekday.
+     *
+     * @param integer   $weekday  The day to render (0-6)
+     * @param array     $weeks    The weeks
+     *
+     * @return string   The formatted table-row
+     */
+    private function renderWeekdayHorizontal($weekday, &$weeks)
+    {
+        $html = '<tr><td class="weekday">'
+            . $this->weekdayName($this->weekStartMonday ? $weekday + 1 : $weekday)
+        . '</td>';
+        foreach ($weeks as $week) {
+            if (array_key_exists($weekday, $week)) {
+                $html .= '<td>' . $this->renderDay($week[$weekday]) . '</td>';
+            } else {
+                $html .= '<td></td>';
+            }
+        }
+        $html .= '</tr>';
+        return $html;
+    }
+
+
+
+    /**
+     * @return array
+     */
+    private function createGrid()
+    {
+        $weeks   = array(array());
+        $week    = 0;
+        $months  = array();
+        $years   = array();
+        $start   = strtotime($this->start);
+        $year    = intval(date('Y', $start));
+        $month   = intval(date('n', $start));
+        $day     = intval(date('j', $start));
+        $weekday = intval(date('w', $start));
+        if ($this->weekStartMonday) {
+            // 0 => monday, 6 => sunday
+            $weekday = $weekday === 0 ? 6 : $weekday - 1;
+        }
+
+        $date = $this->toDateStr($day, $month, $year);
+        $weeks[0][$weekday] = $date;
+        $years[0] = $year;
+        $months[0] = $month;
+        while ($date !== $this->end) {
+            $day++;
+            $weekday++;
+            if ($weekday > 6) {
+                $weekday = 0;
+                $weeks[] = array();
+                // PRESENT => The last day of week determines the month
+                if ($this->weekFlow === self::CAL_GROW_INTO_PRESENT) {
+                    $months[$week] = $month;
+                    $years[$week] = $year;
+                }
+                $week++;
+            }
+            if ($day > date('t', mktime(0, 0, 0, $month, 1, $year))) {
+                $month++;
+                if ($month > 12) {
+                    $year++;
+                    $month = 1;
+                }
+                $day = 1;
+            }
+            if ($weekday === 0) {
+                // PAST => The first day of each week determines the month
+                if ($this->weekFlow === self::CAL_GROW_INTO_PAST) {
+                    $months[$week] = $month;
+                    $years[$week] = $year;
+                }
+            }
+            $date = $this->toDateStr($day, $month, $year);
+            $weeks[$week][$weekday] = $date;
+        };
+        $years[$week] = $year;
+        $months[$week] = $month;
+        if ($this->weekFlow == self::CAL_GROW_INTO_PAST) {
+            return array(
+                'weeks'  => array_reverse($weeks),
+                'months' => array_reverse($months),
+                'years'  => array_reverse($years)
+            );
+        }
+        return array(
+            'weeks'  => $weeks,
+            'months' => $months,
+            'years'  => $years
+        );
+    }
+
+    /**
+     * Get the localized month-name for the given month
+     *
+     * @param integer   $month  The month-number
+     *
+     * @return string   The
+     */
+    private function monthName($month, $year)
+    {
+        // TODO: find a way to render years without messing up the layout
+        $dt = new DateTime($year . '-' . $month . '-01');
+        return $dt->format('M');
+    }
+
+    /**
+     * @param $weekday
+     *
+     * @return string
+     */
+    private function weekdayName($weekday)
+    {
+        $sun = new DateTime('last Sunday');
+        $interval = new DateInterval('P' .  $weekday . 'D');
+        $sun->add($interval);
+        return substr($sun->format('D'), 0, 2);
+    }
+
+    /**
+     *
+     *
+     * @param $timestamp
+     *
+     * @return bool|string
+     */
+    private function tsToDateStr($timestamp)
+    {
+        return date('Y-m-d', $timestamp);
+    }
+
+    /**
+     * @param $day
+     * @param $mon
+     * @param $year
+     *
+     * @return string
+     */
+    private function toDateStr($day, $mon, $year)
+    {
+        $day = $day > 9 ? (string)$day : '0' . (string)$day;
+        $mon = $mon > 9 ? (string)$mon : '0' . (string)$mon;
+        return $year . '-' . $mon . '-' . $day;
+    }
+
+    /**
+     * @return string
+     */
+    public function render()
+    {
+        if (empty($this->data)) {
+            return '<div>No entries</div>';
+        }
+        $grid = $this->createGrid();
+        if ($this->orientation === self::ORIENTATION_HORIZONTAL) {
+            $html = $this->renderHorizontal($grid);
+        } else {
+            $html = $this->renderVertical($grid);
+        }
+
+        $historyGridStyle = new Style();
+        $historyGridStyle->setNonce(Csp::getStyleNonce());
+
+        foreach ($this->rulesets as $selector => $properties) {
+            $historyGridStyle->add($selector, $properties);
+        }
+
+        return $html . $historyGridStyle;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Chart/InlinePie.php b/library/Icinga/Web/Widget/Chart/InlinePie.php
new file mode 100644
index 0000000..21b4ca4
--- /dev/null
+++ b/library/Icinga/Web/Widget/Chart/InlinePie.php
@@ -0,0 +1,257 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Chart;
+
+use Icinga\Chart\PieChart;
+use Icinga\Module\Monitoring\Plugin\PerfdataSet;
+use Icinga\Util\StringHelper;
+use Icinga\Web\Widget\AbstractWidget;
+use Icinga\Web\Url;
+use Icinga\Util\Format;
+use Icinga\Application\Logger;
+use Icinga\Exception\IcingaException;
+use stdClass;
+
+/**
+ * A SVG-PieChart intended to be displayed as a small icon next to labels, to offer a better visualization of the
+ * shown data
+ *
+ * NOTE: When InlinePies are shown in a dynamically loaded view, like the side-bar or in the dashboard, the SVGs will
+ * be replaced with a jQuery-Sparkline to save resources @see loader.js
+ *
+ * @package Icinga\Web\Widget\Chart
+ */
+class InlinePie extends AbstractWidget
+{
+    const NUMBER_FORMAT_NONE = 'none';
+    const NUMBER_FORMAT_TIME = 'time';
+    const NUMBER_FORMAT_BYTES = 'bytes';
+    const NUMBER_FORMAT_RATIO = 'ratio';
+
+    public static $colorsHostStates = array(
+        '#44bb77', // up
+        '#ff99aa', // down
+        '#cc77ff', // unreachable
+        '#77aaff'  // pending
+    );
+
+    public static $colorsHostStatesHandledUnhandled = array(
+        '#44bb77', // up
+        '#44bb77',
+        '#ff99aa', // down
+        '#ff5566',
+        '#cc77ff', // unreachable
+        '#aa44ff',
+        '#77aaff', // pending
+        '#77aaff'
+    );
+
+    public static $colorsServiceStates = array(
+        '#44bb77', // Ok
+        '#ffaa44', // Warning
+        '#ff99aa', // Critical
+        '#aa44ff', // Unknown
+        '#77aaff'  // Pending
+    );
+
+    public static $colorsServiceStatesHandleUnhandled = array(
+        '#44bb77', // Ok
+        '#44bb77',
+        '#ffaa44', // Warning
+        '#ffcc66',
+        '#ff99aa', // Critical
+        '#ff5566',
+        '#cc77ff', // Unknown
+        '#aa44ff',
+        '#77aaff', // Pending
+        '#77aaff'
+    );
+
+    /**
+     * The template string used for rendering this widget
+     *
+     * @var string
+     */
+    private $template = '<div class="inline-pie {class}">{svg}</div>';
+
+    /**
+     * The colors used to display the slices of this pie-chart.
+     *
+     * @var array
+     */
+    private $colors = array('#049BAF', '#ffaa44', '#ff5566', '#ddccdd');
+
+    /**
+     * The title of the chart
+     *
+     * @var string
+     */
+    private $title;
+
+    /**
+     * @var int
+     */
+    private $size = 16;
+
+    /**
+     * The data displayed by the pie-chart
+     *
+     * @var array
+     */
+    private $data;
+
+    /**
+     * @var
+     */
+    private $class = '';
+
+    /**
+     * Set the data to be displayed.
+     *
+     * @param   $data array
+     *
+     * @return  $this
+     */
+    public function setData(array $data)
+    {
+        $this->data = $data;
+
+        return $this;
+    }
+
+    /**
+     * Set the size of the inline pie
+     *
+     * @param int $size     Sets both, the height and width
+     *
+     * @return $this
+     */
+    public function setSize($size = null)
+    {
+        $this->size = $size;
+
+        return $this;
+    }
+
+    /**
+     * Set the class to define the
+     *
+     * @param  $class
+     *
+     * @return $this
+     */
+    public function setSparklineClass($class)
+    {
+        $this->class = $class;
+
+        return $this;
+    }
+
+    /**
+     * Set the colors used by the slices of the pie chart.
+     *
+     * @param   array $colors
+     *
+     * @return  $this
+     */
+    public function setColors(array $colors = null)
+    {
+        $this->colors = $colors;
+
+        return $this;
+    }
+
+    /**
+     * Set the title of the displayed Data
+     *
+     * @param   string $title
+     *
+     * @return  $this
+     */
+    public function setTitle($title)
+    {
+        $this->title = $this->view()->escape($title);
+
+        return $this;
+    }
+
+    /**
+     * Create a new InlinePie
+     *
+     * @param array  $data      The data displayed by the slices
+     * @param string $title     The title of this Pie
+     * @param array  $colors    An array of RGB-Color values to use
+     */
+    public function __construct(array $data, $title, $colors = null)
+    {
+        $this->setTitle($title);
+
+        if (array_key_exists('data', $data)) {
+            $this->data = $data['data'];
+            if (array_key_exists('colors', $data)) {
+                $this->colors = $data['colors'];
+            }
+        } else {
+            $this->setData($data);
+        }
+
+        if (isset($colors)) {
+            $this->setColors($colors);
+        } else {
+            $this->setColors($this->colors);
+        }
+    }
+
+    /**
+     * Renders this widget via the given view and returns the
+     * HTML as a string
+     *
+     * @return string
+     */
+    public function render()
+    {
+        $pie = new PieChart();
+        $pie->alignTopLeft();
+        $pie->disableLegend();
+        $pie->drawPie([
+            'data'      => $this->data,
+            'colors'    => $this->colors
+        ]);
+
+        if ($this->view()->layout()->getLayout() === 'pdf') {
+            try {
+                $png = $pie->toPng($this->size, $this->size);
+                return '<img class="inlinepie" src="data:image/png;base64,' . base64_encode($png) . '" />';
+            } catch (IcingaException $_) {
+                return '';
+            }
+        }
+
+        $pie->title = $this->title;
+        $pie->description = $this->title;
+
+        $template = $this->template;
+        $template = str_replace('{class}', $this->class, $template);
+        $template = str_replace('{svg}', $pie->render(), $template);
+
+        return $template;
+    }
+
+    public static function createFromStateSummary(stdClass $states, $title, array $colors)
+    {
+        $handledUnhandledStates = [];
+        foreach ($states as $key => $value) {
+            if (StringHelper::endsWith($key, '_handled') || StringHelper::endsWith($key, '_unhandled')) {
+                $handledUnhandledStates[$key] = $value;
+            }
+        }
+
+        $chart = new self(array_values($handledUnhandledStates), $title, $colors);
+
+        return $chart
+            ->setSize(50)
+            ->setTitle('')
+            ->setSparklineClass('sparkline-multi');
+    }
+}
diff --git a/library/Icinga/Web/Widget/Dashboard.php b/library/Icinga/Web/Widget/Dashboard.php
new file mode 100644
index 0000000..5a8796d
--- /dev/null
+++ b/library/Icinga/Web/Widget/Dashboard.php
@@ -0,0 +1,475 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Config;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Exception\NotReadableError;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Legacy\DashboardConfig;
+use Icinga\User;
+use Icinga\Web\Navigation\DashboardPane;
+use Icinga\Web\Navigation\Navigation;
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Dashboard\Dashlet as DashboardDashlet;
+use Icinga\Web\Widget\Dashboard\Pane;
+
+/**
+ * Dashboards display multiple views on a single page
+ *
+ * The terminology is as follows:
+ * - Dashlet:     A single view showing a specific url
+ * - Pane:          Aggregates one or more dashlets on one page, displays its title as a tab
+ * - Dashboard:     Shows all panes
+ *
+ */
+class Dashboard extends AbstractWidget
+{
+    /**
+     * An array containing all panes of this dashboard
+     *
+     * @var array
+     */
+    private $panes = array();
+
+    /**
+     * The @see Icinga\Web\Widget\Tabs object for displaying displayable panes
+     *
+     * @var Tabs
+     */
+    protected $tabs;
+
+    /**
+     * The parameter that will be added to identify panes
+     *
+     * @var string
+     */
+    private $tabParam = 'pane';
+
+    /**
+     * @var User
+     */
+    private $user;
+
+    /**
+     * Set the given tab name as active.
+     *
+     * @param string $name      The tab name to activate
+     *
+     */
+    public function activate($name)
+    {
+        $this->getTabs()->activate($name);
+    }
+
+    /**
+     * Load Pane items provided by all enabled modules
+     *
+     * @return  $this
+     */
+    public function load()
+    {
+        $navigation = new Navigation();
+        $navigation->load('dashboard-pane');
+
+        $panes = array();
+        foreach ($navigation as $dashboardPane) {
+            /** @var DashboardPane $dashboardPane */
+            $pane = new Pane($dashboardPane->getLabel());
+            foreach ($dashboardPane->getChildren() as $dashlet) {
+                $pane->addDashlet($dashlet->getLabel(), $dashlet->getUrl());
+            }
+
+            $panes[] = $pane;
+        }
+
+        $this->mergePanes($panes);
+        $this->loadUserDashboards($navigation);
+        return $this;
+    }
+
+    /**
+     * Create and return a Config object for this dashboard
+     *
+     * @return  Config
+     */
+    public function getConfig()
+    {
+        $output = array();
+        foreach ($this->panes as $pane) {
+            if ($pane->isUserWidget()) {
+                $output[$pane->getName()] = $pane->toArray();
+            }
+            foreach ($pane->getDashlets() as $dashlet) {
+                if ($dashlet->isUserWidget()) {
+                    $output[$pane->getName() . '.' . $dashlet->getName()] = $dashlet->toArray();
+                }
+            }
+        }
+
+        return DashboardConfig::fromArray($output)->setConfigFile($this->getConfigFile())->setUser($this->user);
+    }
+
+    /**
+     * Load user dashboards from all config files that match the username
+     */
+    protected function loadUserDashboards(Navigation $navigation)
+    {
+        foreach (DashboardConfig::listConfigFilesForUser($this->user) as $file) {
+            $this->loadUserDashboardsFromFile($file, $navigation);
+        }
+    }
+
+    /**
+     * Load user dashboards from the given config file
+     *
+     * @param   string  $file
+     *
+     * @return  bool
+     */
+    protected function loadUserDashboardsFromFile($file, Navigation $dashboardNavigation)
+    {
+        try {
+            $config = Config::fromIni($file);
+        } catch (NotReadableError $e) {
+            return false;
+        }
+
+        if (! count($config)) {
+            return false;
+        }
+        $panes = array();
+        $dashlets = array();
+        foreach ($config as $key => $part) {
+            if (strpos($key, '.') === false) {
+                $dashboardPane = $dashboardNavigation->getItem($key);
+                if ($dashboardPane !== null) {
+                    $key = $dashboardPane->getLabel();
+                }
+                if ($this->hasPane($key)) {
+                    $panes[$key] = $this->getPane($key);
+                } else {
+                    $panes[$key] = new Pane($key);
+                    $panes[$key]->setTitle($part->title);
+                }
+                $panes[$key]->setUserWidget();
+                if ((bool) $part->get('disabled', false) === true) {
+                    $panes[$key]->setDisabled();
+                }
+            } else {
+                list($paneName, $dashletName) = explode('.', $key, 2);
+                $dashboardPane = $dashboardNavigation->getItem($paneName);
+                if ($dashboardPane !== null) {
+                    $paneName = $dashboardPane->getLabel();
+                    $dashletItem = $dashboardPane->getChildren()->getItem($dashletName);
+                    if ($dashletItem !== null) {
+                        $dashletName = $dashletItem->getLabel();
+                    }
+                }
+                $part->pane = $paneName;
+                $part->dashlet = $dashletName;
+                $dashlets[] = $part;
+            }
+        }
+        foreach ($dashlets as $dashletData) {
+            $pane = null;
+
+            if (array_key_exists($dashletData->pane, $panes) === true) {
+                $pane = $panes[$dashletData->pane];
+            } elseif (array_key_exists($dashletData->pane, $this->panes) === true) {
+                $pane = $this->panes[$dashletData->pane];
+            } else {
+                continue;
+            }
+            $dashlet = new DashboardDashlet(
+                $dashletData->title,
+                $dashletData->url,
+                $pane
+            );
+            $dashlet->setName($dashletData->dashlet);
+
+            if ((bool) $dashletData->get('disabled', false) === true) {
+                $dashlet->setDisabled(true);
+            }
+
+            $dashlet->setUserWidget();
+            $pane->addDashlet($dashlet);
+        }
+
+        $this->mergePanes($panes);
+
+        return true;
+    }
+
+    /**
+     * Merge panes with existing panes
+     *
+     * @param   array $panes
+     *
+     * @return  $this
+     */
+    public function mergePanes(array $panes)
+    {
+        /** @var $pane Pane  */
+        foreach ($panes as $pane) {
+            if ($this->hasPane($pane->getName()) === true) {
+                /** @var $current Pane */
+                $current = $this->panes[$pane->getName()];
+                $current->addDashlets($pane->getDashlets());
+            } else {
+                $this->panes[$pane->getName()] = $pane;
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return the tab object used to navigate through this dashboard
+     *
+     * @return Tabs
+     */
+    public function getTabs()
+    {
+        $url = Url::fromPath('dashboard')->getUrlWithout($this->tabParam);
+        if ($this->tabs === null) {
+            $this->tabs = new Tabs();
+
+            foreach ($this->panes as $key => $pane) {
+                if ($pane->getDisabled()) {
+                    continue;
+                }
+                $this->tabs->add(
+                    $key,
+                    array(
+                        'title'       => sprintf(
+                            t('Show %s', 'dashboard.pane.tooltip'),
+                            $pane->getTitle()
+                        ),
+                        'label'     => $pane->getTitle(),
+                        'url'       => clone($url),
+                        'urlParams' => array($this->tabParam => $key)
+                    )
+                );
+            }
+        }
+        return $this->tabs;
+    }
+
+    /**
+     * Return all panes of this dashboard
+     *
+     * @return array
+     */
+    public function getPanes()
+    {
+        return $this->panes;
+    }
+
+
+    /**
+     * Creates a new empty pane with the given title
+     *
+     * @param string $title
+     *
+     * @return $this
+     */
+    public function createPane($title)
+    {
+        $pane = new Pane($title);
+        $pane->setTitle($title);
+        $this->addPane($pane);
+
+        return $this;
+    }
+
+    /**
+     * Checks if the current dashboard has any panes
+     *
+     * @return bool
+     */
+    public function hasPanes()
+    {
+        return ! empty($this->panes);
+    }
+
+    /**
+     * Check if a panel exist
+     *
+     * @param   string  $pane
+     * @return  bool
+     */
+    public function hasPane($pane)
+    {
+        return $pane && array_key_exists($pane, $this->panes);
+    }
+
+    /**
+     * Add a pane object to this dashboard
+     *
+     * @param Pane $pane        The pane to add
+     *
+     * @return $this
+     */
+    public function addPane(Pane $pane)
+    {
+        $this->panes[$pane->getName()] = $pane;
+        return $this;
+    }
+
+    public function removePane($title)
+    {
+        if ($this->hasPane($title) === true) {
+            $pane = $this->getPane($title);
+            if ($pane->isUserWidget() === true) {
+                unset($this->panes[$pane->getName()]);
+            } else {
+                $pane->setDisabled();
+                $pane->setUserWidget();
+            }
+        } else {
+            throw new ProgrammingError('Pane not found: ' . $title);
+        }
+    }
+
+    /**
+     * Return the pane with the provided name
+     *
+     * @param string $name      The name of the pane to return
+     *
+     * @return Pane        The pane or null if no pane with the given name exists
+     * @throws ProgrammingError
+     */
+    public function getPane($name)
+    {
+        if (! array_key_exists($name, $this->panes)) {
+            throw new ProgrammingError(
+                'Trying to retrieve invalid dashboard pane "%s"',
+                $name
+            );
+        }
+        return $this->panes[$name];
+    }
+
+    /**
+     * Return an array with pane name=>title format used for comboboxes
+     *
+     * @return array
+     */
+    public function getPaneKeyTitleArray()
+    {
+        $list = array();
+        foreach ($this->panes as $name => $pane) {
+            $list[$name] = $pane->getTitle();
+        }
+        return $list;
+    }
+
+    /**
+     * @see Icinga\Web\Widget::render
+     */
+    public function render()
+    {
+        if (empty($this->panes)) {
+            return '';
+        }
+
+        return $this->determineActivePane()->render();
+    }
+
+    /**
+     * Activates the default pane of this dashboard and returns its name
+     *
+     * @return mixed
+     */
+    private function setDefaultPane()
+    {
+        $active = null;
+
+        foreach ($this->panes as $key => $pane) {
+            if ($pane->getDisabled() === false) {
+                $active = $key;
+                break;
+            }
+        }
+
+        if ($active !== null) {
+            $this->activate($active);
+        }
+        return $active;
+    }
+
+    /**
+     * @see determineActivePane()
+     */
+    public function getActivePane()
+    {
+        return $this->determineActivePane();
+    }
+
+    /**
+     * Determine the active pane either by the selected tab or the current request
+     *
+     * @throws \Icinga\Exception\ConfigurationError
+     * @throws \Icinga\Exception\ProgrammingError
+     *
+     * @return Pane The currently active pane
+     */
+    public function determineActivePane()
+    {
+        $active = $this->getTabs()->getActiveName();
+        if (! $active) {
+            if ($active = Url::fromRequest()->getParam($this->tabParam)) {
+                if ($this->hasPane($active)) {
+                    $this->activate($active);
+                } else {
+                    throw new ProgrammingError(
+                        'Try to get an inexistent pane.'
+                    );
+                }
+            } else {
+                $active = $this->setDefaultPane();
+            }
+        }
+
+        if (isset($this->panes[$active])) {
+            return $this->panes[$active];
+        }
+
+        throw new ConfigurationError('Could not determine active pane');
+    }
+
+    /**
+     * Setter for user object
+     *
+     * @param User $user
+     */
+    public function setUser(User $user)
+    {
+        $this->user = $user;
+    }
+
+    /**
+     * Getter for user object
+     *
+     * @return User
+     */
+    public function getUser()
+    {
+        return $this->user;
+    }
+
+    /**
+     * Get config file
+     *
+     * @return string
+     */
+    public function getConfigFile()
+    {
+        if ($this->user === null) {
+            throw new ProgrammingError('Can\'t load dashboards. User is not set');
+        }
+        return Config::resolvePath('dashboards/' . strtolower($this->user->getUsername()) . '/dashboard.ini');
+    }
+}
diff --git a/library/Icinga/Web/Widget/Dashboard/Dashlet.php b/library/Icinga/Web/Widget/Dashboard/Dashlet.php
new file mode 100644
index 0000000..2ba26df
--- /dev/null
+++ b/library/Icinga/Web/Widget/Dashboard/Dashlet.php
@@ -0,0 +1,315 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Dashboard;
+
+use Icinga\Web\Url;
+use Icinga\Data\ConfigObject;
+use Icinga\Exception\IcingaException;
+
+/**
+ * A dashboard pane dashlet
+ *
+ * This is the element displaying a specific view in icinga2web
+ *
+ */
+class Dashlet extends UserWidget
+{
+    /**
+     * The url of this Dashlet
+     *
+     * @var Url|null
+     */
+    private $url;
+
+    private $name;
+
+    /**
+     * The title being displayed on top of the dashlet
+     * @var
+     */
+    private $title;
+
+    /**
+     * The pane containing this dashlet, needed for the 'remove button'
+     * @var Pane
+     */
+    private $pane;
+
+    /**
+     * The disabled option is used to "delete" default dashlets provided by modules
+     *
+     * @var bool
+     */
+    private $disabled = false;
+
+    /**
+     * The progress label being used
+     *
+     * @var string
+     */
+    private $progressLabel;
+
+    /**
+     * The template string used for rendering this widget
+     *
+     * @var string
+     */
+    private $template =<<<'EOD'
+
+    <div class="container" data-icinga-url="{URL}">
+        <h1><a href="{FULL_URL}" aria-label="{TOOLTIP}" title="{TOOLTIP}" data-base-target="col1">{TITLE}</a></h1>
+        <p class="progress-label">{PROGRESS_LABEL}<span>.</span><span>.</span><span>.</span></p>
+        <noscript>
+            <div class="iframe-container">
+                <iframe
+                    src="{IFRAME_URL}"
+                    frameborder="no"
+                    title="{TITLE_PREFIX}{TITLE}">
+                </iframe>
+            </div>
+        </noscript>
+    </div>
+EOD;
+
+    /**
+     * The template string used for rendering this widget in case of an error
+     *
+     * @var string
+     */
+    private $errorTemplate = <<<'EOD'
+
+    <div class="container">
+        <h1 title="{TOOLTIP}">{TITLE}</h1>
+        <p class="error-message">{ERROR_MESSAGE}</p>
+    </div>
+EOD;
+
+    /**
+     * Create a new dashlet displaying the given url in the provided pane
+     *
+     * @param string $title     The title to use for this dashlet
+     * @param Url|string $url   The url this dashlet uses for displaying information
+     * @param Pane $pane        The pane this Dashlet will be added to
+     */
+    public function __construct($title, $url, Pane $pane)
+    {
+        $this->name = $title;
+        $this->title = $title;
+        $this->pane = $pane;
+        $this->url = $url;
+    }
+
+    public function setName($name)
+    {
+        $this->name = $name;
+        return $this;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Retrieve the dashlets title
+     *
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * @param string $title
+     */
+    public function setTitle($title)
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * Retrieve the dashlets url
+     *
+     * @return Url|null
+     */
+    public function getUrl()
+    {
+        if ($this->url !== null && ! $this->url instanceof Url) {
+            $this->url = Url::fromPath($this->url);
+        }
+        return $this->url;
+    }
+
+    /**
+     * Set the dashlets URL
+     *
+     * @param  string|Url $url  The url to use, either as an Url object or as a path
+     *
+     * @return $this
+     */
+    public function setUrl($url)
+    {
+        $this->url = $url;
+        return $this;
+    }
+
+    /**
+     * Set the disabled property
+     *
+     * @param boolean $disabled
+     */
+    public function setDisabled($disabled)
+    {
+        $this->disabled = $disabled;
+    }
+
+    /**
+     * Get the disabled property
+     *
+     * @return boolean
+     */
+    public function getDisabled()
+    {
+        return $this->disabled;
+    }
+
+    /**
+     * Set the progress label to use
+     *
+     * @param   string  $label
+     *
+     * @return  $this
+     */
+    public function setProgressLabel($label)
+    {
+        $this->progressLabel = $label;
+        return $this;
+    }
+
+    /**
+     * Return the progress label to use
+     *
+     * @return  string
+     */
+    public function getProgressLabe()
+    {
+        if ($this->progressLabel === null) {
+            return $this->view()->translate('Loading');
+        }
+
+        return $this->progressLabel;
+    }
+
+    /**
+     * Return this dashlet's structure as array
+     *
+     * @return  array
+     */
+    public function toArray()
+    {
+        $array = array(
+            'url'   => $this->getUrl()->getRelativeUrl(),
+            'title' => $this->getTitle()
+        );
+        if ($this->getDisabled() === true) {
+            $array['disabled'] = 1;
+        }
+        return $array;
+    }
+
+    /**
+     * @see Widget::render()
+     */
+    public function render()
+    {
+        if ($this->disabled === true) {
+            return '';
+        }
+
+        $view = $this->view();
+
+        if (! $this->url) {
+            $searchTokens = array(
+                '{TOOLTIP}',
+                '{TITLE}',
+                '{ERROR_MESSAGE}'
+            );
+
+            $replaceTokens = array(
+                sprintf($view->translate('Show %s', 'dashboard.dashlet.tooltip'), $view->escape($this->getTitle())),
+                $view->escape($this->getTitle()),
+                $view->escape(
+                    sprintf($view->translate('Cannot create dashboard dashlet "%s" without valid URL'), $this->title)
+                )
+            );
+
+            return str_replace($searchTokens, $replaceTokens, $this->errorTemplate);
+        }
+
+        $url = $this->getUrl();
+        $url->setParam('showCompact', true);
+        $iframeUrl = clone $url;
+        $iframeUrl->setParam('isIframe');
+
+        $searchTokens = array(
+            '{URL}',
+            '{IFRAME_URL}',
+            '{FULL_URL}',
+            '{TOOLTIP}',
+            '{TITLE}',
+            '{TITLE_PREFIX}',
+            '{PROGRESS_LABEL}'
+        );
+
+        $replaceTokens = array(
+            $url,
+            $iframeUrl,
+            $url->getUrlWithout(['showCompact', 'limit', 'view']),
+            sprintf($view->translate('Show %s', 'dashboard.dashlet.tooltip'), $view->escape($this->getTitle())),
+            $view->escape($this->getTitle()),
+            $view->translate('Dashlet') . ': ',
+            $this->getProgressLabe()
+        );
+
+        return str_replace($searchTokens, $replaceTokens, $this->template);
+    }
+
+    /**
+     * Create a @see Dashlet instance from the given Zend config, using the provided title
+     *
+     * @param $title                The title for this dashlet
+     * @param ConfigObject $config  The configuration defining url, parameters, height, width, etc.
+     * @param Pane $pane            The pane this dashlet belongs to
+     *
+     * @return Dashlet        A newly created Dashlet for use in the Dashboard
+     */
+    public static function fromIni($title, ConfigObject $config, Pane $pane)
+    {
+        $height = null;
+        $width = null;
+        $url = $config->get('url');
+        $parameters = $config->toArray();
+        unset($parameters['url']); // otherwise there's an url = parameter in the Url
+
+        $cmp = new Dashlet($title, Url::fromPath($url, $parameters), $pane);
+        return $cmp;
+    }
+
+    /**
+     * @param \Icinga\Web\Widget\Dashboard\Pane $pane
+     */
+    public function setPane(Pane $pane)
+    {
+        $this->pane = $pane;
+    }
+
+    /**
+     * @return \Icinga\Web\Widget\Dashboard\Pane
+     */
+    public function getPane()
+    {
+        return $this->pane;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Dashboard/Pane.php b/library/Icinga/Web/Widget/Dashboard/Pane.php
new file mode 100644
index 0000000..c8b14c5
--- /dev/null
+++ b/library/Icinga/Web/Widget/Dashboard/Pane.php
@@ -0,0 +1,335 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Dashboard;
+
+use Icinga\Data\ConfigObject;
+use Icinga\Web\Widget\AbstractWidget;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Exception\ConfigurationError;
+
+/**
+ * A pane, displaying different Dashboard dashlets
+ */
+class Pane extends UserWidget
+{
+    /**
+     * The name of this pane, as defined in the ini file
+     *
+     * @var string
+     */
+    private $name;
+
+    /**
+     * The title of this pane, as displayed in the dashboard tabs
+     *
+     * @var string
+     */
+    private $title;
+
+    /**
+     * An array of @see Dashlets that are displayed in this pane
+     *
+     * @var array
+     */
+    private $dashlets = array();
+
+    /**
+     * Disabled flag of a pane
+     *
+     * @var bool
+     */
+    private $disabled = false;
+
+    /**
+     * Create a new pane
+     *
+     * @param string $name         The pane to create
+     */
+    public function __construct($name)
+    {
+        $this->name  = $name;
+        $this->title = $name;
+    }
+
+    /**
+     * Set the name of this pane
+     *
+     * @param   string  $name
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * Returns the name of this pane
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Returns the title of this pane
+     *
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * Overwrite the title of this pane
+     *
+     * @param string $title     The new title to use for this pane
+     *
+     * @return $this
+     */
+    public function setTitle($title)
+    {
+        $this->title = $title;
+        return $this;
+    }
+
+    /**
+     * Return true if a dashlet with the given title exists in this pane
+     *
+     * @param string $title     The title of the dashlet to check for existence
+     *
+     * @return bool
+     */
+    public function hasDashlet($title)
+    {
+        return array_key_exists($title, $this->dashlets);
+    }
+
+    /**
+     * Checks if the current pane has any dashlets
+     *
+     * @return bool
+     */
+    public function hasDashlets()
+    {
+        return ! empty($this->dashlets);
+    }
+
+    /**
+     * Return a dashlet with the given name if existing
+     *
+     * @param string $title         The title of the dashlet to return
+     *
+     * @return Dashlet            The dashlet with the given title
+     * @throws ProgrammingError     If the dashlet doesn't exist
+     */
+    public function getDashlet($title)
+    {
+        if ($this->hasDashlet($title)) {
+            return $this->dashlets[$title];
+        }
+        throw new ProgrammingError(
+            'Trying to access invalid dashlet: %s',
+            $title
+        );
+    }
+
+    /**
+     * Removes the dashlet with the given title if it exists in this pane
+     *
+     * @param string $title         The pane
+     * @return Pane $this
+     */
+    public function removeDashlet($title)
+    {
+        if ($this->hasDashlet($title)) {
+            $dashlet = $this->getDashlet($title);
+            if ($dashlet->isUserWidget() === true) {
+                unset($this->dashlets[$title]);
+            } else {
+                $dashlet->setDisabled(true);
+                $dashlet->setUserWidget();
+            }
+        } else {
+            throw new ProgrammingError('Dashlet does not exist: ' . $title);
+        }
+        return $this;
+    }
+
+    /**
+     * Removes all or a given list of dashlets from this pane
+     *
+     * @param array $dashlets Optional list of dashlet titles
+     * @return Pane $this
+     */
+    public function removeDashlets(array $dashlets = null)
+    {
+        if ($dashlets === null) {
+            $this->dashlets = array();
+        } else {
+            foreach ($dashlets as $dashlet) {
+                $this->removeDashlet($dashlet);
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * Return all dashlets added at this pane
+     *
+     * @return array
+     */
+    public function getDashlets()
+    {
+        return $this->dashlets;
+    }
+
+    /**
+     * @see Widget::render
+     */
+    public function render()
+    {
+        $dashlets = array_filter(
+            $this->dashlets,
+            function ($e) {
+                return ! $e->getDisabled();
+            }
+        );
+        return implode("\n", $dashlets) . "\n";
+    }
+
+    /**
+     * Create, add and return a new dashlet
+     *
+     * @param   string  $title
+     * @param   string  $url
+     *
+     * @return  Dashlet
+     */
+    public function createDashlet($title, $url = null)
+    {
+        $dashlet = new Dashlet($title, $url, $this);
+        $this->addDashlet($dashlet);
+        return $dashlet;
+    }
+
+    /**
+     * Add a dashlet to this pane, optionally creating it if $dashlet is a string
+     *
+     * @param string|Dashlet $dashlet               The dashlet object or title
+     *                                                  (if a new dashlet will be created)
+     * @param string|null $url                          An Url to be used when dashlet is a string
+     *
+     * @return $this
+     * @throws \Icinga\Exception\ConfigurationError
+     */
+    public function addDashlet($dashlet, $url = null)
+    {
+        if ($dashlet instanceof Dashlet) {
+            $this->dashlets[$dashlet->getName()] = $dashlet;
+        } elseif (is_string($dashlet) && $url !== null) {
+             $this->createDashlet($dashlet, $url);
+        } else {
+            throw new ConfigurationError('Invalid dashlet added: %s', $dashlet);
+        }
+        return $this;
+    }
+
+    /**
+     * Add new dashlets to existing dashlets
+     *
+     * @param array $dashlets
+     * @return $this
+     */
+    public function addDashlets(array $dashlets)
+    {
+        /* @var $dashlet Dashlet */
+        foreach ($dashlets as $dashlet) {
+            if (array_key_exists($dashlet->getName(), $this->dashlets)) {
+                if (preg_match('/_(\d+)$/', $dashlet->getName(), $m)) {
+                    $name = preg_replace('/_\d+$/', $m[1]++, $dashlet->getName());
+                } else {
+                    $name = $dashlet->getName() . '_2';
+                }
+                $this->dashlets[$name] = $dashlet;
+            } else {
+                $this->dashlets[$dashlet->getName()] = $dashlet;
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a dashlet to the current pane
+     *
+     * @param $title
+     * @param $url
+     * @return Dashlet
+     *
+     * @see addDashlet()
+     */
+    public function add($title, $url = null)
+    {
+        $this->addDashlet($title, $url);
+
+        return $this->dashlets[$title];
+    }
+
+    /**
+     * Return the this pane's structure as array
+     *
+     * @return  array
+     */
+    public function toArray()
+    {
+        $pane =  array(
+            'title'     => $this->getTitle(),
+        );
+
+        if ($this->getDisabled() === true) {
+            $pane['disabled'] = 1;
+        }
+
+        return $pane;
+    }
+
+    /**
+     * Create a new pane with the title $title from the given configuration
+     *
+     * @param $title                The title for this pane
+     * @param ConfigObject  $config The configuration to use for setup
+     *
+     * @return Pane
+     */
+    public static function fromIni($title, ConfigObject $config)
+    {
+        $pane = new Pane($title);
+        if ($config->get('title', false)) {
+            $pane->setTitle($config->get('title'));
+        }
+        return $pane;
+    }
+
+    /**
+     * Setter for disabled
+     *
+     * @param boolean $disabled
+     */
+    public function setDisabled($disabled = true)
+    {
+        $this->disabled = (bool) $disabled;
+    }
+
+    /**
+     * Getter for disabled
+     *
+     * @return boolean
+     */
+    public function getDisabled()
+    {
+        return $this->disabled;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Dashboard/UserWidget.php b/library/Icinga/Web/Widget/Dashboard/UserWidget.php
new file mode 100644
index 0000000..164d58b
--- /dev/null
+++ b/library/Icinga/Web/Widget/Dashboard/UserWidget.php
@@ -0,0 +1,36 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Dashboard;
+
+use Icinga\Web\Widget\AbstractWidget;
+
+abstract class UserWidget extends AbstractWidget
+{
+    /**
+     * Flag if widget is created by an user
+     *
+     * @var bool
+     */
+    protected $userWidget = false;
+
+    /**
+     * Set the user widget flag
+     *
+     * @param boolean $userWidget
+     */
+    public function setUserWidget($userWidget = true)
+    {
+        $this->userWidget = (bool) $userWidget;
+    }
+
+    /**
+     * Getter for user widget flag
+     *
+     * @return boolean
+     */
+    public function isUserWidget()
+    {
+        return $this->userWidget;
+    }
+}
diff --git a/library/Icinga/Web/Widget/FilterEditor.php b/library/Icinga/Web/Widget/FilterEditor.php
new file mode 100644
index 0000000..24f4b15
--- /dev/null
+++ b/library/Icinga/Web/Widget/FilterEditor.php
@@ -0,0 +1,811 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Data\Filterable;
+use Icinga\Data\FilterColumns;
+use Icinga\Data\Filter\Filter;
+use Icinga\Data\Filter\FilterExpression;
+use Icinga\Data\Filter\FilterChain;
+use Icinga\Data\Filter\FilterOr;
+use Icinga\Web\Url;
+use Icinga\Application\Icinga;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Notification;
+use Exception;
+
+/**
+ * Filter
+ */
+class FilterEditor extends AbstractWidget
+{
+    /**
+     * The filter
+     *
+     * @var Filter
+     */
+    private $filter;
+
+    /**
+     * The query to filter
+     *
+     * @var Filterable
+     */
+    protected $query;
+
+    protected $url;
+
+    protected $addTo;
+
+    protected $cachedColumnSelect;
+
+    protected $preserveParams = array();
+
+    protected $preservedParams = array();
+
+    protected $preservedUrl;
+
+    protected $ignoreParams = array();
+
+    protected $searchColumns;
+
+    /**
+     * @var string
+     */
+    private $selectedIdx;
+
+    /**
+     * Whether the filter control is visible
+     *
+     * @var bool
+     */
+    protected $visible = true;
+
+    /**
+     * Create a new FilterEditor
+     *
+     * @param Filter $filter Your filter
+     */
+    public function __construct($props)
+    {
+        if (array_key_exists('filter', $props)) {
+            $this->setFilter($props['filter']);
+        }
+        if (array_key_exists('query', $props)) {
+            $this->setQuery($props['query']);
+        }
+    }
+
+    public function setFilter(Filter $filter)
+    {
+        $this->filter = $filter;
+        return $this;
+    }
+
+    public function getFilter()
+    {
+        if ($this->filter === null) {
+            $this->filter = Filter::fromQueryString((string) $this->url()->getParams());
+        }
+        return $this->filter;
+    }
+
+    /**
+     * Set columns to search in
+     *
+     * @param array $searchColumns
+     *
+     * @return $this
+     */
+    public function setSearchColumns(array $searchColumns = null)
+    {
+        $this->searchColumns = $searchColumns;
+        return $this;
+    }
+
+    public function setUrl($url)
+    {
+        $this->url = $url;
+        return $this;
+    }
+
+    protected function url()
+    {
+        if ($this->url === null) {
+            $this->url = Url::fromRequest();
+        }
+        return $this->url;
+    }
+
+    protected function preservedUrl()
+    {
+        if ($this->preservedUrl === null) {
+            $this->preservedUrl = $this->url()->with($this->preservedParams);
+        }
+        return $this->preservedUrl;
+    }
+
+    /**
+     * Set the query to filter
+     *
+     * @param   Filterable  $query
+     *
+     * @return  $this
+     */
+    public function setQuery(Filterable $query)
+    {
+        $this->query = $query;
+        return $this;
+    }
+
+    public function ignoreParams()
+    {
+        $this->ignoreParams = func_get_args();
+        return $this;
+    }
+
+    public function preserveParams()
+    {
+        $this->preserveParams = func_get_args();
+        return $this;
+    }
+
+    /**
+     * Get whether the filter control is visible
+     *
+     * @return  bool
+     */
+    public function isVisible()
+    {
+        return $this->visible;
+    }
+
+    /**
+     * Set whether the filter control is visible
+     *
+     * @param   bool    $visible
+     *
+     * @return  $this
+     */
+    public function setVisible($visible)
+    {
+        $this->visible = (bool) $visible;
+
+        return $this;
+    }
+
+    protected function redirectNow($url)
+    {
+        $response = Icinga::app()->getFrontController()->getResponse();
+        $response->redirectAndExit($url);
+    }
+
+    protected function mergeRootExpression($filter, $column, $sign, $expression)
+    {
+        $found = false;
+        if ($filter->isChain() && $filter->getOperatorName() === 'AND') {
+            foreach ($filter->filters() as $f) {
+                if ($f->isExpression()
+                    && $f->getColumn() === $column
+                    && $f->getSign() === $sign
+                ) {
+                    $f->setExpression($expression);
+                    $found = true;
+                    break;
+                }
+            }
+        } elseif ($filter->isExpression()) {
+            if ($filter->getColumn() === $column && $filter->getSign() === $sign) {
+                $filter->setExpression($expression);
+                $found = true;
+            }
+        }
+        if (! $found) {
+            $filter = $filter->andFilter(
+                Filter::expression($column, $sign, $expression)
+            );
+        }
+        return $filter;
+    }
+
+    protected function resetSearchColumns(Filter &$filter)
+    {
+        if ($filter->isChain()) {
+            $filters = &$filter->filters();
+            if (!($empty = empty($filters))) {
+                foreach ($filters as $k => &$f) {
+                    if (false === $this->resetSearchColumns($f)) {
+                        unset($filters[$k]);
+                    }
+                }
+            }
+            return $empty || !empty($filters);
+        }
+        return $filter->isExpression() ? !(
+            in_array($filter->getColumn(), $this->searchColumns)
+            &&
+            $filter->getSign() === '='
+        ) : true;
+    }
+
+    public function handleRequest($request)
+    {
+        $this->setUrl($request->getUrl()->without($this->ignoreParams));
+        $params = $this->url()->getParams();
+
+        $preserve = array();
+        foreach ($this->preserveParams as $key) {
+            if (null !== ($value = $params->shift($key))) {
+                $preserve[$key] = $value;
+            }
+        }
+        $this->preservedParams = $preserve;
+
+        $add    = $params->shift('addFilter');
+        $remove = $params->shift('removeFilter');
+        $strip  = $params->shift('stripFilter');
+        $modify = $params->shift('modifyFilter');
+
+
+
+        $search = null;
+        if ($request->isPost()) {
+            $search = $request->getPost('q');
+        }
+
+        if ($search === null) {
+            $search = $params->shift('q');
+        }
+
+        $filter = $this->getFilter();
+
+        if ($search !== null) {
+            if (strpos($search, '=') !== false) {
+                list($k, $v) = preg_split('/=/', $search);
+                $filter = $this->mergeRootExpression($filter, trim($k), '=', ltrim($v));
+            } else {
+                if ($this->searchColumns === null && $this->query instanceof FilterColumns) {
+                    $this->searchColumns = $this->query->getSearchColumns($search);
+                }
+
+                if (! empty($this->searchColumns)) {
+                    if (! $this->resetSearchColumns($filter)) {
+                        $filter = Filter::matchAll();
+                    }
+                    $filters = array();
+                    $search = trim($search);
+                    foreach ($this->searchColumns as $searchColumn) {
+                        $filters[] = Filter::expression($searchColumn, '=', "*$search*");
+                    }
+                    $filter = $filter->andFilter(new FilterOr($filters));
+                } else {
+                    Notification::error(mt('monitoring', 'Cannot search here'));
+                    return $this;
+                }
+            }
+
+            $url = Url::fromRequest()->onlyWith($this->preserveParams);
+            $urlParams = $url->getParams();
+            $url->setQueryString($filter->toQueryString());
+            foreach ($urlParams->toArray(false) as $key => $value) {
+                $url->getParams()->addEncoded($key, $value);
+            }
+
+            $this->redirectNow($url);
+        }
+
+        if ($remove) {
+            $redirect = $this->url();
+            if ($filter->getById($remove)->isRootNode()) {
+                $redirect->setQueryString('');
+            } else {
+                $filter->removeId($remove);
+                $redirect->setQueryString($filter->toQueryString())->getParams()->add('modifyFilter');
+            }
+            $this->redirectNow($redirect->addParams($preserve));
+        }
+
+        if ($strip) {
+            $redirect = $this->url();
+            $subId = $strip . '-1';
+            if ($filter->getId() === $strip) {
+                $filter = $filter->getById($strip . '-1');
+            } else {
+                $filter->replaceById($strip, $filter->getById($strip . '-1'));
+            }
+            $redirect->setQueryString($filter->toQueryString())->getParams()->add('modifyFilter');
+            $this->redirectNow($redirect->addParams($preserve));
+        }
+
+
+        if ($modify) {
+            if ($request->isPost()) {
+                if ($request->get('cancel') === 'Cancel') {
+                    $this->redirectNow($this->preservedUrl()->without('modifyFilter'));
+                }
+                if ($request->get('formUID') === 'FilterEditor') {
+                    $filter = $this->applyChanges($request->getPost());
+                    $url = $this->url()->setQueryString($filter->toQueryString())->addParams($preserve);
+                    $url->getParams()->add('modifyFilter');
+
+                    $addFilter = $request->get('add_filter');
+                    if ($addFilter !== null) {
+                        $url->setParam('addFilter', $addFilter);
+                    }
+
+                    $removeFilter = $request->get('remove_filter');
+                    if ($removeFilter !== null) {
+                        $url->setParam('removeFilter', $removeFilter);
+                    }
+
+                    $this->redirectNow($url);
+                }
+            }
+            $this->url()->getParams()->add('modifyFilter');
+        }
+
+        if ($add) {
+            $this->addFilterToId($add);
+        }
+
+        if ($this->query !== null && $request->isGet()) {
+            $this->query->applyFilter($this->getFilter());
+        }
+
+        return $this;
+    }
+
+    protected function select($name, $list, $selected, $attributes = null)
+    {
+        $view = $this->view();
+        if ($attributes === null) {
+            $attributes = '';
+        } else {
+            $attributes = $view->propertiesToString($attributes);
+        }
+        $html = sprintf(
+            '<select name="%s"%s class="autosubmit">' . "\n",
+            $view->escape($name),
+            $attributes
+        );
+
+        foreach ($list as $k => $v) {
+            $active = '';
+            if ($k === $selected) {
+                $active = ' selected="selected"';
+            }
+            $html .= sprintf(
+                '  <option value="%s"%s>%s</option>' . "\n",
+                $view->escape($k),
+                $active,
+                $view->escape($v)
+            );
+        }
+        $html .= '</select>' . "\n\n";
+        return $html;
+    }
+
+    protected function addFilterToId($id)
+    {
+        $this->addTo = $id;
+        return $this;
+    }
+
+    protected function removeIndex($idx)
+    {
+        $this->selectedIdx = $idx;
+        return $this;
+    }
+
+    protected function removeLink(Filter $filter)
+    {
+        return "<button type='submit' name='remove_filter' value='{$filter->getId()}'>"
+            . $this->view()->icon('trash', t('Remove this part of your filter'))
+            . '</button>';
+    }
+
+    protected function addLink(Filter $filter)
+    {
+        return "<button type='submit' name='add_filter' value='{$filter->getId()}'>"
+            . $this->view()->icon('plus', t('Add another filter'))
+            . '</button>';
+    }
+
+    protected function stripLink(Filter $filter)
+    {
+        return $this->view()->qlink(
+            '',
+            $this->preservedUrl()->with('stripFilter', $filter->getId()),
+            null,
+            array(
+                'icon'  => 'minus',
+                'title' => t('Strip this filter')
+            )
+        );
+    }
+
+    protected function cancelLink()
+    {
+        return $this->view()->qlink(
+            '',
+            $this->preservedUrl()->without('addFilter'),
+            null,
+            array(
+                'icon'  => 'cancel',
+                'title' => t('Cancel this operation')
+            )
+        );
+    }
+
+    protected function renderFilter($filter, $level = 0)
+    {
+        if ($level === 0 && $filter->isChain() && $filter->isEmpty()) {
+            return '<ul class="datafilter"><li class="active">' . $this->renderNewFilter() . '</li></ul>';
+        }
+
+        if ($filter instanceof FilterChain) {
+            return $this->renderFilterChain($filter, $level);
+        } elseif ($filter instanceof FilterExpression) {
+            return $this->renderFilterExpression($filter);
+        } else {
+            throw new ProgrammingError('Got a Filter being neither expression nor chain');
+        }
+    }
+
+    protected function renderFilterChain(FilterChain $filter, $level)
+    {
+        $html = '<span class="handle"> </span>'
+              . $this->selectOperator($filter)
+              . $this->removeLink($filter)
+              . ($filter->count() === 1 ? $this->stripLink($filter) : '')
+              . $this->addLink($filter);
+
+        if ($filter->isEmpty() && ! $this->addTo) {
+            return $html;
+        }
+
+        $parts = array();
+        foreach ($filter->filters() as $f) {
+            $parts[] = '<li>' . $this->renderFilter($f, $level + 1) . '</li>';
+        }
+
+        if ($this->addTo && $this->addTo == $filter->getId()) {
+            $parts[] = '<li class="new-filter">' . $this->renderNewFilter() .$this->cancelLink(). '</li>';
+        }
+
+        $class = $level === 0 ? ' class="datafilter"' : '';
+        $html .= sprintf(
+            "<ul%s>\n%s</ul>\n",
+            $class,
+            implode("", $parts)
+        );
+        return $html;
+    }
+
+    protected function renderFilterExpression(FilterExpression $filter)
+    {
+        if ($this->addTo && $this->addTo === $filter->getId()) {
+            return
+                   preg_replace(
+                       '/ class="autosubmit"/',
+                       ' class="autofocus"',
+                       $this->selectOperator()
+                   )
+                  . '<ul><li>'
+                  . $this->selectColumn($filter)
+                  . $this->selectSign($filter)
+                  . $this->text($filter)
+                  . $this->removeLink($filter)
+                  . $this->addLink($filter)
+                  . '</li><li class="active">'
+                  . $this->renderNewFilter() .$this->cancelLink()
+                  . '</li></ul>'
+                  ;
+        } else {
+            return $this->selectColumn($filter)
+                 . $this->selectSign($filter)
+                 . $this->text($filter)
+                 . $this->removeLink($filter)
+                 . $this->addLink($filter)
+                 ;
+        }
+    }
+
+    protected function text(Filter $filter = null)
+    {
+        $value = $filter === null ? '' : $filter->getExpression();
+        if (is_array($value)) {
+            $value = '(' . implode('|', $value) . ')';
+        }
+        return sprintf(
+            '<input type="text" name="%s" value="%s" />',
+            $this->elementId('value', $filter),
+            $this->view()->escape($value)
+        );
+    }
+
+    protected function renderNewFilter()
+    {
+        $html = $this->selectColumn()
+              . $this->selectSign()
+              . $this->text();
+
+        return preg_replace(
+            '/ class="autosubmit"/',
+            '',
+            $html
+        );
+    }
+
+    protected function arrayForSelect($array, $flip = false)
+    {
+        $res = array();
+        foreach ($array as $k => $v) {
+            if (is_int($k)) {
+                $res[$v] = ucwords(str_replace('_', ' ', $v));
+            } elseif ($flip) {
+                $res[$v] = $k;
+            } else {
+                $res[$k] = $v;
+            }
+        }
+        // sort($res);
+        return $res;
+    }
+
+    protected function elementId($prefix, Filter $filter = null)
+    {
+        if ($filter === null) {
+            return $prefix . '_new_' . ($this->addTo ?: '0');
+        } else {
+            return $prefix . '_' . $filter->getId();
+        }
+    }
+
+    protected function selectOperator(Filter $filter = null)
+    {
+        $ops = array(
+            'AND' => 'AND',
+            'OR'  => 'OR',
+            'NOT' => 'NOT'
+        );
+
+        return $this->select(
+            $this->elementId('operator', $filter),
+            $ops,
+            $filter === null ? null : $filter->getOperatorName(),
+            ['class' => 'filter-operator']
+        );
+    }
+
+    protected function selectSign(Filter $filter = null)
+    {
+        $signs = array(
+            '='  => '=',
+            '!=' => '!=',
+            '>'  => '>',
+            '<'  => '<',
+            '>=' => '>=',
+            '<=' => '<=',
+        );
+
+        return $this->select(
+            $this->elementId('sign', $filter),
+            $signs,
+            $filter === null ? null : $filter->getSign(),
+            ['class' => 'filter-rule']
+        );
+    }
+
+    public function setColumns(array $columns = null)
+    {
+        $this->cachedColumnSelect = $columns ? $this->arrayForSelect($columns) : null;
+        return $this;
+    }
+
+    protected function selectColumn(Filter $filter = null)
+    {
+        $active = $filter === null ? null : $filter->getColumn();
+
+        if ($this->cachedColumnSelect === null && $this->query === null) {
+            return sprintf(
+                '<input type="text" name="%s" value="%s" />',
+                $this->elementId('column', $filter),
+                $this->view()->escape($active) // Escape attribute?
+            );
+        }
+
+        if ($this->cachedColumnSelect === null && $this->query instanceof FilterColumns) {
+            $this->cachedColumnSelect = $this->arrayForSelect($this->query->getFilterColumns(), true);
+            asort($this->cachedColumnSelect);
+        } elseif ($this->cachedColumnSelect === null) {
+            throw new ProgrammingError('No columns set nor does the query provide any');
+        }
+
+        $cols = $this->cachedColumnSelect;
+        if ($active && !isset($cols[$active])) {
+            $cols[$active] = str_replace('_', ' ', ucfirst(ltrim($active, '_')));
+        }
+
+        return $this->select($this->elementId('column', $filter), $cols, $active);
+    }
+
+    protected function applyChanges($changes)
+    {
+        $filter = $this->filter;
+        $pairs = array();
+        $addTo = null;
+        $add = array();
+        foreach ($changes as $k => $v) {
+            if (preg_match('/^(column|value|sign|operator)((?:_new)?)_([\d-]+)$/', $k, $m)) {
+                if ($m[2] === '_new') {
+                    if ($addTo !== null && $addTo !== $m[3]) {
+                        throw new \Exception('F...U');
+                    }
+                    $addTo = $m[3];
+                    $add[$m[1]] = $v;
+                } else {
+                    $pairs[$m[3]][$m[1]] = $v;
+                }
+            }
+        }
+
+        $operators = array();
+        foreach ($pairs as $id => $fs) {
+            if (array_key_exists('operator', $fs)) {
+                $operators[$id] = $fs['operator'];
+            } else {
+                $f = $filter->getById($id);
+                $f->setColumn($fs['column']);
+                if ($f->getSign() !== $fs['sign']) {
+                    if ($f->isRootNode()) {
+                        $filter = $f->setSign($fs['sign']);
+                    } else {
+                        $filter->replaceById($id, $f->setSign($fs['sign']));
+                    }
+                }
+                $f->setExpression($fs['value']);
+            }
+        }
+
+        krsort($operators, SORT_NATURAL);
+        foreach ($operators as $id => $operator) {
+            $f = $filter->getById($id);
+            if ($f->getOperatorName() !== $operator) {
+                if ($f->isRootNode()) {
+                    $filter = $f->setOperatorName($operator);
+                } else {
+                    $filter->replaceById($id, $f->setOperatorName($operator));
+                }
+            }
+        }
+
+        if ($addTo !== null) {
+            if ($addTo === '0') {
+                $filter = Filter::expression($add['column'], $add['sign'], $add['value']);
+            } else {
+                $parent = $filter->getById($addTo);
+                $f = Filter::expression($add['column'], $add['sign'], $add['value']);
+                if (isset($add['operator'])) {
+                    switch ($add['operator']) {
+                        case 'AND':
+                            if ($parent->isExpression()) {
+                                if ($parent->isRootNode()) {
+                                    $filter = Filter::matchAll(clone $parent, $f);
+                                } else {
+                                    $filter = $filter->replaceById($addTo, Filter::matchAll(clone $parent, $f));
+                                }
+                            } else {
+                                $parent->addFilter(Filter::matchAll($f));
+                            }
+                            break;
+                        case 'OR':
+                            if ($parent->isExpression()) {
+                                if ($parent->isRootNode()) {
+                                    $filter = Filter::matchAny(clone $parent, $f);
+                                } else {
+                                    $filter = $filter->replaceById($addTo, Filter::matchAny(clone $parent, $f));
+                                }
+                            } else {
+                                $parent->addFilter(Filter::matchAny($f));
+                            }
+                            break;
+                        case 'NOT':
+                            if ($parent->isExpression()) {
+                                if ($parent->isRootNode()) {
+                                    $filter = Filter::not(Filter::matchAll($parent, $f));
+                                } else {
+                                    $filter = $filter->replaceById($addTo, Filter::not(Filter::matchAll($parent, $f)));
+                                }
+                            } else {
+                                $parent->addFilter(Filter::not($f));
+                            }
+                            break;
+                    }
+                } else {
+                    $parent->addFilter($f);
+                }
+            }
+        }
+
+        return $filter;
+    }
+
+    public function renderSearch()
+    {
+        $preservedUrl = $this->preservedUrl();
+
+        $html = ' <form method="post" class="search inline" action="'
+              . $preservedUrl
+              . '"><input type="text" name="q" class="search search-input" value="" placeholder="'
+              . t('Search...')
+              . '" /></form>';
+
+        if ($this->filter->isEmpty()) {
+            $title = t('Filter this list');
+        } else {
+            $title = t('Modify this filter');
+            if (! $this->filter->isEmpty()) {
+                $title .= ': ' . $this->view()->escape($this->filter);
+            }
+        }
+
+        return $html
+            . '<a href="'
+            . $preservedUrl->with('modifyFilter', ! $preservedUrl->getParam('modifyFilter'))
+            . '" aria-label="'
+            . $title
+            . '" title="'
+            . $title
+            . '">'
+            . '<i aria-hidden="true" class="icon-filter"></i>'
+            . '</a>';
+    }
+
+    public function render()
+    {
+        if (! $this->visible) {
+            return '';
+        }
+        if (! $this->preservedUrl()->getParam('modifyFilter')) {
+            return '<div class="filter icinga-controls">'
+                . $this->renderSearch()
+                . $this->view()->escape($this->shorten($this->filter, 50))
+                . '</div>';
+        }
+        return  '<div class="filter icinga-controls">'
+            . $this->renderSearch()
+            . '<form action="'
+            . Url::fromRequest()
+            . '" class="editor" method="POST">'
+            . '<input type="submit" name="submit" value="Apply" hidden/>'
+            . '<ul class="tree"><li>'
+            . $this->renderFilter($this->filter)
+            . '</li></ul>'
+            . '<div class="buttons">'
+            . '<input type="submit" name="cancel" value="Cancel" class="button btn-cancel" />'
+            . '<input type="submit" name="submit" value="Apply" class="button btn-primary"/>'
+            . '</div>'
+            . '<input type="hidden" name="formUID" value="FilterEditor">'
+            . '</form>'
+            . '</div>';
+    }
+
+    protected function shorten($string, $length)
+    {
+        if (strlen($string) > $length) {
+            return substr($string, 0, $length) . '...';
+        }
+        return $string;
+    }
+
+    public function __toString()
+    {
+        try {
+            return $this->render();
+        } catch (Exception $e) {
+            return 'ERROR in FilterEditor: ' . $e->getMessage();
+        }
+    }
+}
diff --git a/library/Icinga/Web/Widget/ItemList/MigrationFileListItem.php b/library/Icinga/Web/Widget/ItemList/MigrationFileListItem.php
new file mode 100644
index 0000000..007a730
--- /dev/null
+++ b/library/Icinga/Web/Widget/ItemList/MigrationFileListItem.php
@@ -0,0 +1,92 @@
+<?php
+
+/* Icinga Web 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Widget\ItemList;
+
+use Icinga\Application\Hook\Common\DbMigrationStep;
+use ipl\Html\Attributes;
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Html;
+use ipl\Html\HtmlElement;
+use ipl\Html\HtmlString;
+use ipl\Html\Text;
+use ipl\I18n\Translation;
+use ipl\Web\Common\BaseListItem;
+use ipl\Web\Widget\EmptyState;
+use ipl\Web\Widget\Icon;
+
+class MigrationFileListItem extends BaseListItem
+{
+    use Translation;
+
+    /** @var DbMigrationStep Just for type hint */
+    protected $item;
+
+    protected function assembleVisual(BaseHtmlElement $visual): void
+    {
+        if ($this->item->getLastState()) {
+            $visual->getAttributes()->add('class', 'upgrade-failed');
+            $visual->addHtml(new Icon('circle-xmark'));
+        }
+    }
+
+    protected function assembleTitle(BaseHtmlElement $title): void
+    {
+        $scriptPath = $this->item->getScriptPath();
+        /** @var string $parentDirs */
+        $parentDirs = substr($scriptPath, (int) strpos($scriptPath, 'schema'));
+        $parentDirs = substr($parentDirs, 0, strrpos($parentDirs, '/') + 1);
+
+        $title->addHtml(
+            new HtmlElement('span', null, Text::create($parentDirs)),
+            new HtmlElement(
+                'span',
+                Attributes::create(['class' => 'version']),
+                Text::create($this->item->getVersion() . '.sql')
+            )
+        );
+
+        if ($this->item->getLastState()) {
+            $title->addHtml(
+                new HtmlElement(
+                    'span',
+                    Attributes::create(['class' => 'upgrade-failed']),
+                    Text::create($this->translate('Upgrade failed'))
+                )
+            );
+        }
+    }
+
+    protected function assembleHeader(BaseHtmlElement $header): void
+    {
+        $header->addHtml($this->createTitle());
+    }
+
+    protected function assembleCaption(BaseHtmlElement $caption): void
+    {
+        if ($this->item->getDescription()) {
+            $caption->addHtml(Text::create($this->item->getDescription()));
+        } else {
+            $caption->addHtml(new EmptyState(Text::create($this->translate('No description provided.'))));
+        }
+    }
+
+    protected function assembleFooter(BaseHtmlElement $footer): void
+    {
+        if ($this->item->getLastState()) {
+            $footer->addHtml(
+                new HtmlElement(
+                    'section',
+                    Attributes::create(['class' => 'caption']),
+                    new HtmlElement('pre', null, new HtmlString(Html::escape($this->item->getLastState())))
+                )
+            );
+        }
+    }
+
+    protected function assembleMain(BaseHtmlElement $main): void
+    {
+        $main->addHtml($this->createHeader(), $this->createCaption());
+    }
+}
diff --git a/library/Icinga/Web/Widget/ItemList/MigrationList.php b/library/Icinga/Web/Widget/ItemList/MigrationList.php
new file mode 100644
index 0000000..43699d3
--- /dev/null
+++ b/library/Icinga/Web/Widget/ItemList/MigrationList.php
@@ -0,0 +1,133 @@
+<?php
+
+/* Icinga Web 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Widget\ItemList;
+
+use Generator;
+use Icinga\Application\Hook\Common\DbMigrationStep;
+use Icinga\Application\Hook\DbMigrationHook;
+use Icinga\Application\MigrationManager;
+use Icinga\Forms\MigrationForm;
+use ipl\I18n\Translation;
+use ipl\Web\Common\BaseItemList;
+use ipl\Web\Widget\EmptyStateBar;
+
+class MigrationList extends BaseItemList
+{
+    use Translation;
+
+    protected $baseAttributes = ['class' => 'item-list'];
+
+    /** @var Generator<DbMigrationHook> */
+    protected $data;
+
+    /** @var ?MigrationForm */
+    protected $migrationForm;
+
+    /** @var bool Whether to render minimal migration list items */
+    protected $minimal = true;
+
+    /**
+     * Create a new migration list
+     *
+     * @param Generator<DbMigrationHook>|array<DbMigrationStep|DbMigrationHook> $data
+     *
+     * @param ?MigrationForm $form
+     */
+    public function __construct($data, MigrationForm $form = null)
+    {
+        parent::__construct($data);
+
+        $this->migrationForm = $form;
+    }
+
+    /**
+     * Set whether to render minimal migration list items
+     *
+     * @param bool $minimal
+     *
+     * @return $this
+     */
+    public function setMinimal(bool $minimal): self
+    {
+        $this->minimal = $minimal;
+
+        return $this;
+    }
+
+    /**
+     * Get whether to render minimal migration list items
+     *
+     * @return bool
+     */
+    public function isMinimal(): bool
+    {
+        return $this->minimal;
+    }
+
+    protected function getItemClass(): string
+    {
+        if ($this->isMinimal()) {
+            return MigrationListItem::class;
+        }
+
+        return MigrationFileListItem::class;
+    }
+
+    protected function assemble(): void
+    {
+        $itemClass = $this->getItemClass();
+        if (! $this->isMinimal()) {
+            $this->getAttributes()->add('class', 'file-list');
+        }
+
+        /** @var DbMigrationHook $data */
+        foreach ($this->data as $data) {
+            /** @var MigrationFileListItem|MigrationListItem $item */
+            $item = new $itemClass($data, $this);
+            if ($item instanceof MigrationListItem && $this->migrationForm) {
+                $migrateButton = $this->migrationForm->createElement(
+                    'submit',
+                    sprintf('migrate-%s', $data->getModuleName()),
+                    [
+                        'required' => false,
+                        'label'    => $this->translate('Migrate'),
+                        'title'    => sprintf(
+                            $this->translatePlural(
+                                'Migrate %d pending migration',
+                                'Migrate all %d pending migrations',
+                                $data->count()
+                            ),
+                            $data->count()
+                        )
+                    ]
+                );
+
+                $mm = MigrationManager::instance();
+                if ($data->isModule() && $mm->hasMigrations(DbMigrationHook::DEFAULT_MODULE)) {
+                    $migrateButton->getAttributes()
+                        ->set('disabled', true)
+                        ->set(
+                            'title',
+                            $this->translate(
+                                'Please apply all the pending migrations of Icinga Web first or use the apply all'
+                                . ' button instead.'
+                            )
+                        );
+                }
+
+                $this->migrationForm->registerElement($migrateButton);
+
+                $item->setMigrateButton($migrateButton);
+            }
+
+            $this->addHtml($item);
+        }
+
+        if ($this->isEmpty()) {
+            $this->setTag('div');
+            $this->addHtml(new EmptyStateBar(t('No items found.')));
+        }
+    }
+}
diff --git a/library/Icinga/Web/Widget/ItemList/MigrationListItem.php b/library/Icinga/Web/Widget/ItemList/MigrationListItem.php
new file mode 100644
index 0000000..284ce4c
--- /dev/null
+++ b/library/Icinga/Web/Widget/ItemList/MigrationListItem.php
@@ -0,0 +1,151 @@
+<?php
+
+/* Icinga Web 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Widget\ItemList;
+
+use Icinga\Application\Hook\Common\DbMigrationStep;
+use Icinga\Application\Hook\DbMigrationHook;
+use ipl\Html\Attributes;
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Contract\FormElement;
+use ipl\Html\FormattedString;
+use ipl\Html\Html;
+use ipl\Html\HtmlElement;
+use ipl\Html\HtmlString;
+use ipl\Html\Text;
+use ipl\I18n\Translation;
+use ipl\Web\Common\BaseListItem;
+use ipl\Web\Url;
+use ipl\Web\Widget\EmptyState;
+use ipl\Web\Widget\Icon;
+use ipl\Web\Widget\Link;
+use LogicException;
+
+class MigrationListItem extends BaseListItem
+{
+    use Translation;
+
+    /** @var ?FormElement */
+    protected $migrateButton;
+
+    /** @var DbMigrationHook Just for type hint */
+    protected $item;
+
+    /**
+     * Set a migration form of this list item
+     *
+     * @param FormElement $migrateButton
+     *
+     * @return $this
+     */
+    public function setMigrateButton(FormElement $migrateButton): self
+    {
+        $this->migrateButton = $migrateButton;
+
+        return $this;
+    }
+
+    protected function assembleTitle(BaseHtmlElement $title): void
+    {
+        $title->addHtml(
+            FormattedString::create(
+                t('%s ', '<name>'),
+                HtmlElement::create('span', ['class' => 'subject'], $this->item->getName())
+            )
+        );
+    }
+
+    protected function assembleHeader(BaseHtmlElement $header): void
+    {
+        if ($this->migrateButton === null) {
+            throw new LogicException('Please set the migrate submit button beforehand');
+        }
+
+        $header->addHtml($this->createTitle());
+        $header->addHtml($this->migrateButton);
+    }
+
+    protected function assembleCaption(BaseHtmlElement $caption): void
+    {
+        $migrations = $this->item->getMigrations();
+        /** @var DbMigrationStep $migration */
+        $migration = array_shift($migrations);
+        if ($migration->getLastState()) {
+            if ($migration->getDescription()) {
+                $caption->addHtml(Text::create($migration->getDescription()));
+            } else {
+                $caption->addHtml(new EmptyState(Text::create($this->translate('No description provided.'))));
+            }
+
+            $scriptPath = $migration->getScriptPath();
+            /** @var string $parentDirs */
+            $parentDirs = substr($scriptPath, (int) strpos($scriptPath, 'schema'));
+            $parentDirs = substr($parentDirs, 0, strrpos($parentDirs, '/') + 1);
+
+            $title = new HtmlElement('div', Attributes::create(['class' => 'title']));
+            $title->addHtml(
+                new HtmlElement('span', null, Text::create($parentDirs)),
+                new HtmlElement(
+                    'span',
+                    Attributes::create(['class' => 'version']),
+                    Text::create($migration->getVersion() . '.sql')
+                ),
+                new HtmlElement(
+                    'span',
+                    Attributes::create(['class' => 'upgrade-failed']),
+                    Text::create($this->translate('Upgrade failed'))
+                )
+            );
+
+            $error = new HtmlElement('div', Attributes::create([
+                'class'               => 'collapsible',
+                'data-visible-height' => '58',
+            ]));
+            $error->addHtml(new HtmlElement('pre', null, new HtmlString(Html::escape($migration->getLastState()))));
+
+            $errorSection = new HtmlElement('div', Attributes::create(['class' => 'errors-section',]));
+            $errorSection->addHtml(
+                new HtmlElement('header', null, new Icon('circle-xmark', ['class' => 'status-icon']), $title),
+                $caption,
+                $error
+            );
+
+            $caption->prependWrapper($errorSection);
+        }
+    }
+
+    protected function assembleFooter(BaseHtmlElement $footer): void
+    {
+        $footer->addHtml((new MigrationList($this->item->getLatestMigrations(3)))->setMinimal(false));
+        if ($this->item->count() > 3) {
+            $footer->addHtml(
+                new Link(
+                    sprintf($this->translate('Show all %d migrations'), $this->item->count()),
+                    Url::fromPath(
+                        'migrations/migration',
+                        [DbMigrationHook::MIGRATION_PARAM => $this->item->getModuleName()]
+                    ),
+                    [
+                        'data-base-target' => '_next',
+                        'class' => 'show-more'
+                    ]
+                )
+            );
+        }
+    }
+
+    protected function assembleMain(BaseHtmlElement $main): void
+    {
+        $main->addHtml($this->createHeader());
+        $caption = $this->createCaption();
+        if (! $caption->isEmpty()) {
+            $main->addHtml($caption);
+        }
+
+        $footer = $this->createFooter();
+        if ($footer) {
+            $main->addHtml($footer);
+        }
+    }
+}
diff --git a/library/Icinga/Web/Widget/Limiter.php b/library/Icinga/Web/Widget/Limiter.php
new file mode 100644
index 0000000..d127aca
--- /dev/null
+++ b/library/Icinga/Web/Widget/Limiter.php
@@ -0,0 +1,54 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Forms\Control\LimiterControlForm;
+
+/**
+ * Limiter control widget
+ */
+class Limiter extends AbstractWidget
+{
+    /**
+     * Default limit for this instance
+     *
+     * @var int|null
+     */
+    protected $defaultLimit;
+
+    /**
+     * Get the default limit
+     *
+     * @return int|null
+     */
+    public function getDefaultLimit()
+    {
+        return $this->defaultLimit;
+    }
+
+    /**
+     * Set the default limit
+     *
+     * @param   int $defaultLimit
+     *
+     * @return  $this
+     */
+    public function setDefaultLimit($defaultLimit)
+    {
+        $this->defaultLimit = (int) $defaultLimit;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render()
+    {
+        $control = new LimiterControlForm();
+        $control
+            ->setDefaultLimit($this->defaultLimit)
+            ->handleRequest();
+        return (string)$control;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Paginator.php b/library/Icinga/Web/Widget/Paginator.php
new file mode 100644
index 0000000..5f3ef04
--- /dev/null
+++ b/library/Icinga/Web/Widget/Paginator.php
@@ -0,0 +1,167 @@
+<?php
+/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Data\Paginatable;
+use Icinga\Exception\ProgrammingError;
+
+/**
+ * Paginator
+ */
+class Paginator extends AbstractWidget
+{
+    /**
+     * The query the paginator widget is created for
+     *
+     * @var Paginatable
+     */
+    protected $query;
+
+    /**
+     * The view script in use
+     *
+     * @var string|array
+     */
+    protected $viewScript = array('mixedPagination.phtml', 'default');
+
+    /**
+     * Set the query to create the paginator widget for
+     *
+     * @param   Paginatable      $query
+     *
+     * @return  $this
+     */
+    public function setQuery(Paginatable $query)
+    {
+        $this->query = $query;
+        return $this;
+    }
+
+    /**
+     * Set the view script to use
+     *
+     * @param   string|array    $script
+     *
+     * @return  $this
+     */
+    public function setViewScript($script)
+    {
+        $this->viewScript = $script;
+        return $this;
+    }
+
+    /**
+     * Render this paginator
+     */
+    public function render()
+    {
+        if ($this->query === null) {
+            throw new ProgrammingError('Need a query to create the paginator widget for');
+        }
+
+        $itemCountPerPage = $this->query->getLimit();
+        if (! $itemCountPerPage) {
+            return ''; // No pagination required
+        }
+
+        $totalItemCount = count($this->query);
+        $pageCount = (int) ceil($totalItemCount / $itemCountPerPage);
+        $currentPage = $this->query->hasOffset() ? ($this->query->getOffset() / $itemCountPerPage) + 1 : 1;
+        $pagesInRange = $this->getPages($pageCount, $currentPage);
+        $variables = array(
+            'totalItemCount'    => $totalItemCount,
+            'pageCount'         => $pageCount,
+            'itemCountPerPage'  => $itemCountPerPage,
+            'first'             => 1,
+            'current'           => $currentPage,
+            'last'              => $pageCount,
+            'pagesInRange'      => $pagesInRange,
+            'firstPageInRange'  => min($pagesInRange),
+            'lastPageInRange'   => max($pagesInRange)
+        );
+
+        if ($currentPage > 1) {
+            $variables['previous'] = $currentPage - 1;
+        }
+
+        if ($currentPage < $pageCount) {
+            $variables['next'] = $currentPage + 1;
+        }
+
+        if (is_array($this->viewScript)) {
+            if ($this->viewScript[1] !== null) {
+                return $this->view()->partial($this->viewScript[0], $this->viewScript[1], $variables);
+            }
+
+            return $this->view()->partial($this->viewScript[0], $variables);
+        }
+
+        return $this->view()->partial($this->viewScript, $variables);
+    }
+
+    /**
+     * Returns an array of "local" pages given the page count and current page number
+     *
+     * @return  array
+     */
+    protected function getPages($pageCount, $currentPage)
+    {
+        $range = array();
+
+        if ($pageCount < 10) {
+            // Show all pages if we have less than 10
+            for ($i = 1; $i < 10; $i++) {
+                if ($i > $pageCount) {
+                    break;
+                }
+
+                $range[$i] = $i;
+            }
+        } else {
+            // More than 10 pages:
+            foreach (array(1, 2) as $i) {
+                $range[$i] = $i;
+            }
+
+            if ($currentPage < 6) {
+                // We are on page 1-5 from
+                for ($i = 1; $i <= 7; $i++) {
+                    $range[$i] = $i;
+                }
+            } else {
+                // Current page > 5
+                $range[] = '...';
+
+                if (($pageCount - $currentPage) < 5) {
+                    // Less than 5 pages left
+                    $start = 5 - ($pageCount - $currentPage);
+                } else {
+                    $start = 1;
+                }
+
+                for ($i = $currentPage - $start; $i < ($currentPage + (4 - $start)); $i++) {
+                    if ($i > $pageCount) {
+                        break;
+                    }
+
+                    $range[$i] = $i;
+                }
+            }
+
+            if ($currentPage < ($pageCount - 2)) {
+                $range[] = '...';
+            }
+
+            foreach (array($pageCount - 1, $pageCount) as $i) {
+                $range[$i] = $i;
+            }
+        }
+
+        if (empty($range)) {
+            $range[] = 1;
+        }
+
+        return $range;
+    }
+}
diff --git a/library/Icinga/Web/Widget/SearchDashboard.php b/library/Icinga/Web/Widget/SearchDashboard.php
new file mode 100644
index 0000000..1ce4c46
--- /dev/null
+++ b/library/Icinga/Web/Widget/SearchDashboard.php
@@ -0,0 +1,111 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Zend_Controller_Action_Exception;
+use Icinga\Application\Icinga;
+use Icinga\Web\Url;
+
+/**
+ * Class SearchDashboard display multiple search views on a single search page
+ */
+class SearchDashboard extends Dashboard
+{
+    /**
+     * Name for the search pane
+     *
+     * @var string
+     */
+    const SEARCH_PANE = 'search';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTabs()
+    {
+        if ($this->tabs === null) {
+            $this->tabs = new Tabs();
+            $this->tabs->add(
+                'search',
+                array(
+                    'title' => t('Show Search', 'dashboard.pane.tooltip'),
+                    'label' => t('Search'),
+                    'url'   => Url::fromRequest()
+                )
+            );
+        }
+        return $this->tabs;
+    }
+
+    /**
+     * Load all available search dashlets from modules
+     *
+     * @param   string $searchString
+     *
+     * @return  $this
+     */
+    public function search($searchString = '')
+    {
+        $pane = $this->createPane(self::SEARCH_PANE)->getPane(self::SEARCH_PANE)->setTitle(t('Search'));
+        $this->activate(self::SEARCH_PANE);
+
+        $manager = Icinga::app()->getModuleManager();
+        $searchUrls = array();
+
+        foreach ($manager->getLoadedModules() as $module) {
+            if ($this->getUser()->can($manager::MODULE_PERMISSION_NS . $module->getName())) {
+                $moduleSearchUrls = $module->getSearchUrls();
+                if (! empty($moduleSearchUrls)) {
+                    if ($searchString === '') {
+                        $pane->add(t('Ready to search'), 'search/hint');
+                        return $this;
+                    }
+                    $searchUrls = array_merge($searchUrls, $moduleSearchUrls);
+                }
+            }
+        }
+
+        usort($searchUrls, array($this, 'compareSearchUrls'));
+
+        foreach (array_reverse($searchUrls) as $searchUrl) {
+            $pane->createDashlet(
+                $searchUrl->title . ': ' . $searchString,
+                Url::fromPath($searchUrl->url, array('q' => $searchString))
+            )->setProgressLabel(t('Searching'));
+        }
+
+        return $this;
+    }
+
+    /**
+     * Renders the output
+     *
+     * @return  string
+     *
+     * @throws  Zend_Controller_Action_Exception
+     */
+    public function render()
+    {
+        if (! $this->getPane(self::SEARCH_PANE)->hasDashlets()) {
+            throw new Zend_Controller_Action_Exception(t('Page not found'), 404);
+        }
+        return parent::render();
+    }
+
+    /**
+     * Compare search URLs based on their priority
+     *
+     * @param   object  $a
+     * @param   object  $b
+     *
+     * @return  int
+     */
+    private function compareSearchUrls($a, $b)
+    {
+        if ($a->priority === $b->priority) {
+            return 0;
+        }
+        return ($a->priority < $b->priority) ? -1 : 1;
+    }
+}
diff --git a/library/Icinga/Web/Widget/SingleValueSearchControl.php b/library/Icinga/Web/Widget/SingleValueSearchControl.php
new file mode 100644
index 0000000..470518c
--- /dev/null
+++ b/library/Icinga/Web/Widget/SingleValueSearchControl.php
@@ -0,0 +1,200 @@
+<?php
+/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Icinga;
+use ipl\Html\Attributes;
+use ipl\Html\Form;
+use ipl\Html\FormElement\InputElement;
+use ipl\Html\HtmlElement;
+use ipl\Web\Control\SearchBar\Suggestions;
+use ipl\Web\Url;
+
+class SingleValueSearchControl extends Form
+{
+    /** @var string */
+    const DEFAULT_SEARCH_PARAMETER = 'q';
+
+    protected $defaultAttributes = ['class' => 'icinga-controls inline'];
+
+    /** @var string */
+    protected $searchParameter = self::DEFAULT_SEARCH_PARAMETER;
+
+    /** @var string */
+    protected $inputLabel;
+
+    /** @var string */
+    protected $submitLabel;
+
+    /** @var Url */
+    protected $suggestionUrl;
+
+    /** @var array */
+    protected $metaDataNames;
+
+    /**
+     * Set the search parameter to use
+     *
+     * @param   string $name
+     * @return  $this
+     */
+    public function setSearchParameter($name)
+    {
+        $this->searchParameter = $name;
+
+        return $this;
+    }
+
+    /**
+     * Set the input's label
+     *
+     * @param string $label
+     *
+     * @return $this
+     */
+    public function setInputLabel($label)
+    {
+        $this->inputLabel = $label;
+
+        return $this;
+    }
+
+    /**
+     * Set the submit button's label
+     *
+     * @param string $label
+     *
+     * @return $this
+     */
+    public function setSubmitLabel($label)
+    {
+        $this->submitLabel = $label;
+
+        return $this;
+    }
+
+    /**
+     * Set the suggestion url
+     *
+     * @param   Url $url
+     *
+     * @return  $this
+     */
+    public function setSuggestionUrl(Url $url)
+    {
+        $this->suggestionUrl = $url;
+
+        return $this;
+    }
+
+    /**
+     * Set names for which hidden meta data elements should be created
+     *
+     * @param string ...$names
+     *
+     * @return $this
+     */
+    public function setMetaDataNames(...$names)
+    {
+        $this->metaDataNames = $names;
+
+        return $this;
+    }
+
+    protected function assemble()
+    {
+        $suggestionsId = Icinga::app()->getRequest()->protectId('single-value-suggestions');
+
+        $this->addElement(
+            'text',
+            $this->searchParameter,
+            [
+                'required'              => true,
+                'minlength'             => 1,
+                'autocomplete'          => 'off',
+                'class'                 => 'search',
+                'data-enrichment-type'  => 'completion',
+                'data-term-suggestions' => '#' . $suggestionsId,
+                'data-suggest-url'      => $this->suggestionUrl,
+                'placeholder'           => $this->inputLabel
+            ]
+        );
+
+        if (! empty($this->metaDataNames)) {
+            $fieldset = new HtmlElement('fieldset');
+            foreach ($this->metaDataNames as $name) {
+                $hiddenElement = $this->createElement('hidden', $this->searchParameter . '-' . $name);
+                $this->registerElement($hiddenElement);
+                $fieldset->addHtml($hiddenElement);
+            }
+
+            $this->getElement($this->searchParameter)->prependWrapper($fieldset);
+        }
+
+        $this->addElement(
+            'submit',
+            'btn_sumit',
+            [
+                'label' => $this->submitLabel,
+                'class' => 'btn-primary'
+            ]
+        );
+
+        $this->add(HtmlElement::create('div', [
+            'id'    => $suggestionsId,
+            'class' => 'search-suggestions'
+        ]));
+    }
+
+    /**
+     * Create a list of search suggestions based on the given groups
+     *
+     * @param array $groups
+     *
+     * @return HtmlElement
+     */
+    public static function createSuggestions(array $groups)
+    {
+        $ul = new HtmlElement('ul');
+        foreach ($groups as list($name, $entries)) {
+            if ($name) {
+                if ($entries === false) {
+                    $ul->addHtml(HtmlElement::create('li', ['class' => 'failure-message'], [
+                        HtmlElement::create('em', null, t('Can\'t search:')),
+                        $name
+                    ]));
+                    continue;
+                } elseif (empty($entries)) {
+                    $ul->addHtml(HtmlElement::create('li', ['class' => 'failure-message'], [
+                        HtmlElement::create('em', null, t('No results:')),
+                        $name
+                    ]));
+                    continue;
+                } else {
+                    $ul->addHtml(
+                        HtmlElement::create('li', ['class' => Suggestions::SUGGESTION_TITLE_CLASS], $name)
+                    );
+                }
+            }
+
+            $index = 0;
+            foreach ($entries as list($label, $metaData)) {
+                $attributes = [
+                    'value'     => $label,
+                    'type'      => 'button',
+                    'tabindex'  => -1
+                ];
+                foreach ($metaData as $key => $value) {
+                    $attributes['data-' . $key] = $value;
+                }
+
+                $liAtrs = ['class' => $index === 0 ? 'default' : null];
+                $ul->addHtml(new HtmlElement('li', Attributes::create($liAtrs), new InputElement(null, $attributes)));
+                $index++;
+            }
+        }
+
+        return $ul;
+    }
+}
diff --git a/library/Icinga/Web/Widget/SortBox.php b/library/Icinga/Web/Widget/SortBox.php
new file mode 100644
index 0000000..72b6f58
--- /dev/null
+++ b/library/Icinga/Web/Widget/SortBox.php
@@ -0,0 +1,260 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Icinga;
+use Icinga\Data\Sortable;
+use Icinga\Data\SortRules;
+use Icinga\Web\Form;
+use Icinga\Web\Request;
+
+/**
+ * SortBox widget
+ *
+ * The "SortBox" Widget allows you to create a generic sort input for sortable views. It automatically creates a select
+ * box with all sort options and a dropbox with the sort direction. It also handles automatic submission of sorting
+ * changes and draws an additional submit button when JavaScript is disabled.
+ *
+ * The constructor takes a string for the component name and an array containing the select options, where the key is
+ * the value to be submitted and the value is the label that will be shown. You then should call setRequest in order
+ * to  make sure the form is correctly populated when a request with a sort parameter is being made.
+ *
+ * Call setQuery in case you'll do not want to handle URL parameters manually, but to automatically apply the user's
+ * chosen sort rules on the given sortable query. This will also allow the SortBox to display the user the correct
+ * default sort rules if the given query provides already some sort rules.
+ */
+class SortBox extends AbstractWidget
+{
+    /**
+     * An array containing all sort columns with their associated labels
+     *
+     * @var array
+     */
+    protected $sortFields;
+
+    /**
+     * An array containing default sort directions for specific columns
+     *
+     * The first entry will be used as default sort column.
+     *
+     * @var array
+     */
+    protected $sortDefaults;
+
+    /**
+     * The name used to uniquely identfy the forms being created
+     *
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * The request to fetch sort rules from
+     *
+     * @var Request
+     */
+    protected $request;
+
+    /**
+     * The query to apply sort rules on
+     *
+     * @var Sortable
+     */
+    protected $query;
+
+    /**
+     * Create a SortBox with the entries from $sortFields
+     *
+     * @param   string  $name           The name for the SortBox
+     * @param   array   $sortFields     An array containing the columns and their labels to be displayed in the SortBox
+     * @param   array   $sortDefaults   An array containing default sort directions for specific columns
+     */
+    public function __construct($name, array $sortFields, array $sortDefaults = null)
+    {
+        $this->name = $name;
+        $this->sortFields = $sortFields;
+        $this->sortDefaults = $sortDefaults;
+    }
+
+    /**
+     * Create a SortBox
+     *
+     * @param   string  $name           The name for the SortBox
+     * @param   array   $sortFields     An array containing the columns and their labels to be displayed in the SortBox
+     * @param   array   $sortDefaults   An array containing default sort directions for specific columns
+     *
+     * @return  SortBox
+     */
+    public static function create($name, array $sortFields, array $sortDefaults = null)
+    {
+        return new static($name, $sortFields, $sortDefaults);
+    }
+
+    /**
+     * Set the request to fetch sort rules from
+     *
+     * @param   Request     $request
+     *
+     * @return  $this
+     */
+    public function setRequest($request)
+    {
+        $this->request = $request;
+        return $this;
+    }
+
+    /**
+     * Set the query to apply sort rules on
+     *
+     * @param   Sortable    $query
+     *
+     * @return  $this
+     */
+    public function setQuery(Sortable $query)
+    {
+        $this->query = $query;
+        return $this;
+    }
+
+    /**
+     * Return the default sort rule for the query
+     *
+     * @param   string  $column     An optional column
+     *
+     * @return  array               An array of two values: $column, $direction
+     */
+    protected function getSortDefaults($column = null)
+    {
+        $direction = null;
+        if (! empty($this->sortDefaults) && ($column === null || isset($this->sortDefaults[$column]))) {
+            if ($column === null) {
+                reset($this->sortDefaults);
+                $column = key($this->sortDefaults);
+            }
+
+            $direction = $this->sortDefaults[$column];
+        } elseif ($this->query !== null && $this->query instanceof SortRules) {
+            $sortRules = $this->query->getSortRules();
+            if ($column === null) {
+                $column = key($sortRules);
+            }
+
+            if ($column !== null && isset($sortRules[$column]['order'])) {
+                $direction = strtoupper($sortRules[$column]['order']) === Sortable::SORT_DESC ? 'desc' : 'asc';
+            }
+        } elseif ($column === null) {
+            reset($this->sortFields);
+            $column = key($this->sortFields);
+        }
+
+        return array($column, $direction);
+    }
+
+    /**
+     * Apply the sort rules from the given or current request on the query
+     *
+     * @param   Request     $request
+     *
+     * @return  $this
+     */
+    public function handleRequest(Request $request = null)
+    {
+        if ($this->query !== null) {
+            if ($request === null) {
+                $request = Icinga::app()->getRequest();
+            }
+
+            if (! ($sort = $request->getParam('sort'))) {
+                list($sort, $dir) = $this->getSortDefaults();
+            } else {
+                list($_, $dir) = $this->getSortDefaults($sort);
+            }
+
+            $this->query->order($sort, $request->getParam('dir', $dir));
+        }
+
+        return $this;
+    }
+
+    /**
+     * Render this SortBox as HTML
+     *
+     * @return  string
+     */
+    public function render()
+    {
+        $columnForm = new Form();
+        $columnForm->setTokenDisabled();
+        $columnForm->setName($this->name . '-column');
+        $columnForm->setAttrib('class', 'icinga-controls inline');
+        $columnForm->addElement(
+            'select',
+            'sort',
+            array(
+                'autosubmit'    => true,
+                'label'         => $this->view()->translate('Sort by'),
+                'multiOptions'  => $this->sortFields,
+                'decorators'    => array(
+                    array('ViewHelper'),
+                    array('Label')
+                )
+            )
+        );
+
+        $column = null;
+        if ($this->request) {
+            $url = $this->request->getUrl();
+            if ($url->hasParam('sort')) {
+                $column = $url->getParam('sort');
+
+                if ($url->hasParam('dir')) {
+                    $direction = $url->getParam('dir');
+                } else {
+                    list($_, $direction) = $this->getSortDefaults($column);
+                }
+            } elseif ($url->hasParam('dir')) {
+                $direction = $url->getParam('dir');
+                list($column, $_) = $this->getSortDefaults();
+            }
+        }
+
+        if ($column === null) {
+            list($column, $direction) = $this->getSortDefaults();
+        }
+
+        // TODO(el): ToggleButton :)
+        $toggle = array('asc' => 'sort-name-down', 'desc' => 'sort-name-up');
+        unset($toggle[isset($direction) ? strtolower($direction) : 'asc']);
+        $newDirection = key($toggle);
+        $icon = current($toggle);
+
+        $orderForm = new Form();
+        $orderForm->setTokenDisabled();
+        $orderForm->setName($this->name . '-order');
+        $orderForm->setAttrib('class', 'inline sort-direction-control');
+        $orderForm->addElement(
+            'hidden',
+            'dir'
+        );
+        $orderForm->addElement(
+            'button',
+            'btn_submit',
+            array(
+                'ignore'        => true,
+                'type'          => 'submit',
+                'label'         => $this->view()->icon($icon),
+                'decorators'    => array('ViewHelper'),
+                'escape'        => false,
+                'class'         => 'link-button spinner',
+                'value'         => 'submit',
+                'title'         => t('Change sort direction'),
+            )
+        );
+
+
+        $columnForm->populate(array('sort' => $column));
+        $orderForm->populate(array('dir' => $newDirection));
+        return '<div class="sort-control">' . $columnForm . $orderForm . '</div>';
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tab.php b/library/Icinga/Web/Widget/Tab.php
new file mode 100644
index 0000000..a367f00
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tab.php
@@ -0,0 +1,323 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Web\Url;
+
+/**
+ * A single tab, usually used through the tabs widget
+ *
+ * Will generate an &lt;li&gt; list item, with an optional link and icon
+ *
+ * @property string $name      Tab identifier
+ * @property string $title     Tab title
+ * @property string $icon      Icon URL, preferrably relative to the Icinga
+ *                             base URL
+ * @property string|URL $url   Action URL, preferrably relative to the Icinga
+ *                             base URL
+ * @property string $urlParams Action URL Parameters
+ *
+ */
+class Tab extends AbstractWidget
+{
+    /**
+     * Whether this tab is currently active
+     *
+     * @var bool
+     */
+    private $active = false;
+
+    /**
+     * Default values for widget properties
+     *
+     * @var array
+     */
+    private $name = null;
+
+    /**
+     * The title displayed for this tab
+     *
+     * @var string
+     */
+    private $title = '';
+
+    /**
+     * The label displayed for this tab
+     *
+     * @var string
+     */
+    private $label = '';
+
+    /**
+     * The Url this tab points to
+     *
+     * @var Url|null
+     */
+    private $url = null;
+
+    /**
+     * The parameters for this tab's Url
+     *
+     * @var array
+     */
+    private $urlParams = array();
+
+    /**
+     * The icon image to use for this tab or null if none
+     *
+     * @var string|null
+     */
+    private $icon = null;
+
+    /**
+     * The icon class to use if $icon is null
+     *
+     * @var string|null
+     */
+    private $iconCls = null;
+
+    /**
+     * Additional a tag attributes
+     *
+     * @var array
+     */
+    private $tagParams;
+
+    /**
+     * Whether to open the link target on a new page
+     *
+     * @var boolean
+     */
+    private $targetBlank = false;
+
+    /**
+     * Data base target that determines if the link will be opened in a side-bar or in the main container
+     *
+     * @var null
+     */
+    private $baseTarget = null;
+
+    /**
+     * Sets an icon image for this tab
+     *
+     * @param string $icon      The url of the image to use
+     */
+    public function setIcon($icon)
+    {
+        if (is_string($icon) && strpos($icon, '.') !== false) {
+            $icon = Url::fromPath($icon);
+        }
+        $this->icon = $icon;
+    }
+
+    /**
+     * Set's an icon class that will be used in an <i> tag if no icon image is set
+     *
+     * @param string $iconCls       The CSS class of the icon to use
+     */
+    public function setIconCls($iconCls)
+    {
+        $this->iconCls = $iconCls;
+    }
+
+    /**
+     * @param mixed $name
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * Set the tab label
+     *
+     * @param string $label
+     */
+    public function setLabel($label)
+    {
+        $this->label = $label;
+    }
+
+    /**
+     * Get the tab label
+     *
+     * @return string
+     */
+    public function getLabel()
+    {
+        if (! $this->label) {
+            return $this->title;
+        }
+
+        return $this->label;
+    }
+
+    /**
+     * @param mixed $title
+     */
+    public function setTitle($title)
+    {
+        $this->title = $title;
+    }
+
+    /**
+     * Set the Url this tab points to
+     *
+     * @param string|Url $url       The Url to use for this tab
+     */
+    public function setUrl($url)
+    {
+        if (is_string($url)) {
+            $url = Url::fromPath($url);
+        }
+        $this->url = $url;
+    }
+
+    /**
+     * Get the tab's target URL
+     *
+     * @return Url
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+
+    /**
+     * Set the parameters to be set for this tabs Url
+     *
+     * @param array $url        The Url parameters to set
+     */
+    public function setUrlParams(array $urlParams)
+    {
+        $this->urlParams = $urlParams;
+    }
+
+    /**
+     * Set additional a tag attributes
+     *
+     * @param array $tagParams
+     */
+    public function setTagParams(array $tagParams)
+    {
+        $this->tagParams = $tagParams;
+    }
+
+    public function setTargetBlank($value = true)
+    {
+        $this->targetBlank =  $value;
+    }
+
+    public function setBaseTarget($value)
+    {
+        $this->baseTarget = $value;
+    }
+
+    /**
+     * Create a new Tab with the given properties
+     *
+     * Allowed properties are all properties for which a setter exists
+     *
+     * @param array $properties     An array of properties
+     */
+    public function __construct(array $properties = array())
+    {
+        foreach ($properties as $name => $value) {
+            $setter = 'set' . ucfirst($name);
+            if (method_exists($this, $setter)) {
+                $this->$setter($value);
+            }
+        }
+    }
+
+    /**
+     * Set this tab active (default) or inactive
+     *
+     * This is usually done through the tabs container widget, therefore it
+     * is not a good idea to directly call this function
+     *
+     * @param  bool $active Whether the tab should be active
+     *
+     * @return $this
+     */
+    public function setActive($active = true)
+    {
+        $this->active = (bool) $active;
+        return $this;
+    }
+
+    /**
+     * @see Widget::render()
+     */
+    public function render()
+    {
+        $view = $this->view();
+        $classes = array();
+        if ($this->active) {
+            $classes[] = 'active';
+        }
+
+        $caption = $view->escape($this->getLabel());
+        $tagParams = $this->tagParams;
+        if ($this->targetBlank) {
+            // add warning to links that open in new tabs to improve accessibility, as recommended by WCAG20 G201
+            $caption .= '<span class="info-box display-on-hover"> opens in new window </span>';
+            $tagParams['target'] ='_blank';
+        }
+
+        if ($this->title) {
+            if ($tagParams !== null) {
+                $tagParams['title'] = $this->title;
+                $tagParams['aria-label'] = $this->title;
+            } else {
+                $tagParams = array(
+                    'title'         => $this->title,
+                    'aria-label'    => $this->title
+                );
+            }
+        }
+
+        if ($this->baseTarget !== null) {
+            $tagParams['data-base-target'] = $this->baseTarget;
+        }
+
+        if ($this->icon !== null) {
+            if (strpos($this->icon, '.') === false) {
+                $caption = $view->icon($this->icon) . $caption;
+            } else {
+                $caption = $view->img($this->icon, null, array('class' => 'icon')) . $caption;
+            }
+        }
+
+        if ($this->url !== null) {
+            $this->url->overwriteParams($this->urlParams);
+
+            if ($tagParams !== null) {
+                $params = $view->propertiesToString($tagParams);
+            } else {
+                $params = '';
+            }
+
+            $tab = sprintf(
+                '<a href="%s"%s>%s</a>',
+                $this->view()->escape($this->url->getAbsoluteUrl()),
+                $params,
+                $caption
+            );
+        } else {
+            $tab = $caption;
+        }
+
+        $class = empty($classes) ? '' : sprintf(' class="%s"', implode(' ', $classes));
+        return '<li ' . $class . '>' . $tab . "</li>\n";
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tabextension/DashboardAction.php b/library/Icinga/Web/Widget/Tabextension/DashboardAction.php
new file mode 100644
index 0000000..a3e6c43
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabextension/DashboardAction.php
@@ -0,0 +1,35 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Tabextension;
+
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Tabs;
+
+/**
+ * Tabextension that allows to add the current URL to a dashboard
+ *
+ * Displayed as a dropdown field in the tabs
+ */
+class DashboardAction implements Tabextension
+{
+    /**
+     * Applies the dashboard actions to the provided tabset
+     *
+     * @param   Tabs $tabs The tabs object to extend with
+     */
+    public function apply(Tabs $tabs)
+    {
+        $tabs->addAsDropdown(
+            'dashboard',
+            array(
+                'icon'      => 'dashboard',
+                'label'     => t('Add To Dashboard'),
+                'url'       => Url::fromPath('dashboard/new-dashlet'),
+                'urlParams' => array(
+                    'url' => rawurlencode(Url::fromRequest()->getRelativeUrl())
+                )
+            )
+        );
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tabextension/DashboardSettings.php b/library/Icinga/Web/Widget/Tabextension/DashboardSettings.php
new file mode 100644
index 0000000..fc7412a
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabextension/DashboardSettings.php
@@ -0,0 +1,39 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Tabextension;
+
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Tabs;
+
+/**
+ * Dashboard settings
+ */
+class DashboardSettings implements Tabextension
+{
+    /**
+     * Apply this tabextension to the provided tabs
+     *
+     * @param Tabs $tabs The tabbar to modify
+     */
+    public function apply(Tabs $tabs)
+    {
+        $tabs->addAsDropdown(
+            'dashboard_add',
+            array(
+                'icon'      => 'dashboard',
+                'label'     => t('Add Dashlet'),
+                'url'       => Url::fromPath('dashboard/new-dashlet')
+            )
+        );
+
+        $tabs->addAsDropdown(
+            'dashboard_settings',
+            array(
+                'icon'      => 'dashboard',
+                'label'     => t('Settings'),
+                'url'       => Url::fromPath('dashboard/settings')
+            )
+        );
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tabextension/MenuAction.php b/library/Icinga/Web/Widget/Tabextension/MenuAction.php
new file mode 100644
index 0000000..d713892
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabextension/MenuAction.php
@@ -0,0 +1,35 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Tabextension;
+
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Tabs;
+
+/**
+ * Tabextension that allows to add the current URL as menu entry
+ *
+ * Displayed as a dropdown field in the tabs
+ */
+class MenuAction implements Tabextension
+{
+    /**
+     * Applies the menu actions to the provided tabset
+     *
+     * @param   Tabs $tabs The tabs object to extend with
+     */
+    public function apply(Tabs $tabs)
+    {
+        $tabs->addAsDropdown(
+            'menu-entry',
+            array(
+                'icon'      => 'menu',
+                'label'     => t('Add To Menu'),
+                'url'       => Url::fromPath('navigation/add'),
+                'urlParams' => array(
+                    'url' => rawurlencode(Url::fromRequest()->getRelativeUrl())
+                )
+            )
+        );
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tabextension/OutputFormat.php b/library/Icinga/Web/Widget/Tabextension/OutputFormat.php
new file mode 100644
index 0000000..d5d83af
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabextension/OutputFormat.php
@@ -0,0 +1,114 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Tabextension;
+
+use Icinga\Application\Platform;
+use Icinga\Application\Hook;
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Tab;
+use Icinga\Web\Widget\Tabs;
+
+/**
+ * Tabextension that offers different output formats for the user in the dropdown area
+ */
+class OutputFormat implements Tabextension
+{
+    /**
+     * PDF output type
+     */
+    const TYPE_PDF = 'pdf';
+
+    /**
+     * JSON output type
+     */
+    const TYPE_JSON = 'json';
+
+    /**
+     * CSV output type
+     */
+    const TYPE_CSV = 'csv';
+
+    /**
+     * An array of tabs to be added to the dropdown area
+     *
+     * @var array
+     */
+    private $tabs = array();
+
+    /**
+     * Create a new OutputFormat extender
+     *
+     * In general, it's assumed that all types are supported when an outputFormat extension
+     * is added, so this class offers to remove specific types instead of adding ones
+     *
+     * @param array $disabled An array of output types to <b>not</b> show.
+     */
+    public function __construct(array $disabled = array())
+    {
+        foreach ($this->getSupportedTypes() as $type => $tabConfig) {
+            if (!in_array($type, $disabled)) {
+                $tabConfig['url'] = Url::fromRequest();
+                $tab = new Tab($tabConfig);
+                $tab->setTargetBlank();
+                $this->tabs[] = $tab;
+            }
+        }
+    }
+
+    /**
+     * Applies the format selectio to the provided tabset
+     *
+     * @param   Tabs $tabs The tabs object to extend with
+     *
+     * @see     Tabextension::apply()
+     */
+    public function apply(Tabs $tabs)
+    {
+        foreach ($this->tabs as $tab) {
+            $tabs->addAsDropdown($tab->getName(), $tab);
+        }
+    }
+
+    /**
+     * Return an array containing the tab definitions for all supported types
+     *
+     * Using array_keys on this array or isset allows to check whether a
+     * requested type is supported
+     *
+     * @return  array
+     */
+    public function getSupportedTypes()
+    {
+        $supportedTypes = array();
+
+        $pdfexport = Hook::has('Pdfexport');
+
+        if ($pdfexport || Platform::extensionLoaded('gd')) {
+            $supportedTypes[self::TYPE_PDF] = array(
+                'name'      => 'pdf',
+                'label'     => 'PDF',
+                'icon'      => 'file-pdf',
+                'urlParams' => array('format' => 'pdf'),
+            );
+        }
+
+        $supportedTypes[self::TYPE_CSV] = array(
+            'name'      => 'csv',
+            'label'     => 'CSV',
+            'icon'      => 'file-excel',
+            'urlParams' => array('format' => 'csv')
+        );
+
+        if (Platform::extensionLoaded('json')) {
+            $supportedTypes[self::TYPE_JSON] = array(
+                'name'      => 'json',
+                'label'     => 'JSON',
+                'icon'      => 'doc-text',
+                'urlParams' => array('format' => 'json')
+            );
+        }
+
+        return $supportedTypes;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Tabextension/Tabextension.php b/library/Icinga/Web/Widget/Tabextension/Tabextension.php
new file mode 100644
index 0000000..ea49c4b
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabextension/Tabextension.php
@@ -0,0 +1,25 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget\Tabextension;
+
+use Icinga\Web\Widget\Tabs;
+
+/**
+ * Tabextension interface that allows to extend a tabbar with reusable components
+ *
+ * Tabs can be either extended by creating a `Tabextension` and calling the `apply()` method
+ * or by calling the `\Icinga\Web\Widget\Tabs` `extend()` method and providing
+ * a tab extension
+ *
+ * @see \Icinga\Web\Widget\Tabs::extend()
+ */
+interface Tabextension
+{
+    /**
+     * Apply this tabextension to the provided tabs
+     *
+     * @param Tabs $tabs The tabbar to modify
+     */
+    public function apply(Tabs $tabs);
+}
diff --git a/library/Icinga/Web/Widget/Tabs.php b/library/Icinga/Web/Widget/Tabs.php
new file mode 100644
index 0000000..9efa423
--- /dev/null
+++ b/library/Icinga/Web/Widget/Tabs.php
@@ -0,0 +1,453 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Exception;
+use Icinga\Exception\Http\HttpNotFoundException;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Url;
+use Icinga\Web\Widget\Tabextension\Tabextension;
+use Icinga\Application\Icinga;
+use Countable;
+
+/**
+ * Navigation tab widget
+ */
+class Tabs extends AbstractWidget implements Countable
+{
+    /**
+     * Template used for the base tabs
+     *
+     * @var string
+     */
+    private $baseTpl = <<< 'EOT'
+<ul class="tabs primary-nav nav">
+  {TABS}
+  {DROPDOWN}
+  {REFRESH}
+  {CLOSE}
+</ul>
+EOT;
+
+    /**
+     * Template used for the tabs dropdown
+     *
+     * @var string
+     */
+    private $dropdownTpl = <<< 'EOT'
+<li class="dropdown-nav-item">
+  <a href="#" class="dropdown-toggle" title="{TITLE}" aria-label="{TITLE}">
+    <i aria-hidden="true" class="icon-down-open"></i>
+  </a>
+  <ul class="nav">
+    {TABS}
+  </ul>
+</li>
+EOT;
+
+    /**
+     * Template used for the close-button
+     *
+     * @var string
+     */
+    private $closeTpl = <<< 'EOT'
+<li class="close-container-btn">
+  <a href="#" title="{TITLE}" aria-label="{TITLE}" class="close-container-control">
+    <i aria-hidden="true" class="icon-cancel"></i>
+  </a>
+</li>
+EOT;
+
+    /**
+     * Template used for the refresh icon
+     *
+     * @var string
+     */
+    private $refreshTpl = <<< 'EOT'
+<li>
+  <a class="refresh-container-control spinner" href="{URL}" title="{TITLE}" aria-label="{LABEL}">
+    <i aria-hidden="true" class="icon-cw"></i>
+  </a>
+</li>
+EOT;
+
+    /**
+     * This is where single tabs added to this container will be stored
+     *
+     * @var array
+     */
+    private $tabs = array();
+
+    /**
+     * The name of the currently activated tab
+     *
+     * @var string
+     */
+    private $active;
+
+    /**
+     * Array of tab names which should be displayed in a dropdown
+     *
+     * @var array
+     */
+    private $dropdownTabs = array();
+
+    /**
+     * Whether only the close-button should by rendered for this tab
+     *
+     * @var bool
+     */
+    private $closeButtonOnly = false;
+
+    /**
+     * Whether the tabs should contain a close-button
+     *
+     * @var bool
+     */
+    private $closeTab = true;
+
+    /**
+     * CSS class name(s) for the &lt;ul&gt; element
+     *
+     * @var string
+     */
+    private $tab_class;
+
+    /**
+     * Set whether the current tab is closable
+     */
+    public function hideCloseButton()
+    {
+        $this->closeTab = false;
+    }
+
+    /**
+     * Activate the tab with the given name
+     *
+     * If another tab is currently active it will be deactivated
+     *
+     * @param   string  $name           Name of the tab going to be activated
+     *
+     * @return  $this
+     *
+     * @throws  HttpNotFoundException   When the tab w/ the given name does not exist
+     *
+     */
+    public function activate($name)
+    {
+        if (! $this->has($name)) {
+            throw new HttpNotFoundException('Can\'t activate tab %s. Tab does not exist', $name);
+        }
+
+        if ($this->active !== null) {
+            $this->tabs[$this->active]->setActive(false);
+        }
+        $this->get($name)->setActive();
+        $this->active = $name;
+
+        return $this;
+    }
+
+    /**
+     * Return the name of the active tab
+     *
+     * @return string
+     */
+    public function getActiveName()
+    {
+        return $this->active;
+    }
+
+    /**
+     * Set the CSS class name(s) for the &lt;ul&gt; element
+     *
+     * @param   string $name CSS class name(s)
+     *
+     * @return  $this
+     */
+    public function setClass($name)
+    {
+        $this->tab_class = $name;
+        return $this;
+    }
+
+    /**
+     * Whether the given tab name exists
+     *
+     * @param   string $name Tab name
+     *
+     * @return  bool
+     */
+    public function has($name)
+    {
+        return array_key_exists($name, $this->tabs);
+    }
+
+    /**
+     * Whether the given tab name exists
+     *
+     * @param   string $name The tab you're interested in
+     *
+     * @return  Tab
+     *
+     * @throws  ProgrammingError When the given tab name doesn't exist
+     */
+    public function get($name)
+    {
+        if (!$this->has($name)) {
+            return null;
+        }
+        return $this->tabs[$name];
+    }
+
+    /**
+     * Add a new tab
+     *
+     * A unique tab name is required, the Tab itself can either be an array
+     * with tab properties or an instance of an existing Tab
+     *
+     * @param   string      $name   The new tab name
+     * @param   array|Tab   $tab    The tab itself of its properties
+     *
+     * @return  $this
+     *
+     * @throws  ProgrammingError When the tab name already exists
+     */
+    public function add($name, $tab)
+    {
+        if ($this->has($name)) {
+            throw new ProgrammingError(
+                'Cannot add a tab named "%s" twice"',
+                $name
+            );
+        }
+        return $this->set($name, $tab);
+    }
+
+    /**
+     * Set a tab
+     *
+     * A unique tab name is required, will be replaced in case it already
+     * exists. The tab can either be an array with tab properties or an instance
+     * of an existing Tab
+     *
+     * @param   string      $name   The new tab name
+     * @param   array|Tab   $tab    The tab itself of its properties
+     *
+     * @return  $this
+     */
+    public function set($name, $tab)
+    {
+        if ($tab instanceof Tab) {
+            $this->tabs[$name] = $tab;
+        } else {
+            $this->tabs[$name] = new Tab($tab + array('name' => $name));
+        }
+        return $this;
+    }
+
+    /**
+     * Remove a tab
+     *
+     * @param   string  $name
+     *
+     * @return  $this
+     */
+    public function remove($name)
+    {
+        if ($this->has($name)) {
+            unset($this->tabs[$name]);
+            if (($dropdownIndex = array_search($name, $this->dropdownTabs, true)) !== false) {
+                array_splice($this->dropdownTabs, $dropdownIndex, 1);
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a tab to the dropdown on the right side of the tab-bar.
+     *
+     * @param $name
+     * @param $tab
+     */
+    public function addAsDropdown($name, $tab)
+    {
+        $this->set($name, $tab);
+        $this->dropdownTabs[] = $name;
+        $this->dropdownTabs = array_unique($this->dropdownTabs);
+    }
+
+    /**
+     * Render the dropdown area with its tabs and return the resulting HTML
+     *
+     * @return  mixed|string
+     */
+    private function renderDropdownTabs()
+    {
+        if (empty($this->dropdownTabs)) {
+            return '';
+        }
+        $tabs = '';
+        foreach ($this->dropdownTabs as $tabname) {
+            $tab = $this->get($tabname);
+            if ($tab === null) {
+                continue;
+            }
+            $tabs .= $tab;
+        }
+        return str_replace(array('{TABS}', '{TITLE}'), array($tabs, t('Dropdown menu')), $this->dropdownTpl);
+    }
+
+    /**
+     * Render all tabs, except the ones in dropdown area and return the resulting HTML
+     *
+     * @return  string
+     */
+    private function renderTabs()
+    {
+        $tabs = '';
+        foreach ($this->tabs as $name => $tab) {
+            // ignore tabs added to dropdown
+            if (in_array($name, $this->dropdownTabs)) {
+                continue;
+            }
+            $tabs .= $tab;
+        }
+        return $tabs;
+    }
+
+    private function renderCloseTab()
+    {
+        return str_replace('{TITLE}', t('Close container'), $this->closeTpl);
+    }
+
+    private function renderRefreshTab()
+    {
+        $url = Url::fromRequest();
+        $tab = $this->get($this->getActiveName());
+
+        if ($tab !== null) {
+            $label = $this->view()->escape(
+                $tab->getLabel()
+            );
+        }
+
+        if (! empty($label)) {
+            $caption = $label;
+        } else {
+            $caption = t('Content');
+        }
+
+        $label = sprintf(t('Refresh the %s'), $caption);
+        $title = $label;
+
+        $tpl = str_replace(
+            array(
+                '{URL}',
+                '{TITLE}',
+                '{LABEL}'
+            ),
+            array(
+                $this->view()->escape($url->getAbsoluteUrl()),
+                $title,
+                $label
+            ),
+            $this->refreshTpl
+        );
+
+        return $tpl;
+    }
+
+    /**
+     * Render to HTML
+     *
+     * @see Widget::render
+     */
+    public function render()
+    {
+        if (empty($this->tabs) || true === $this->closeButtonOnly) {
+            $tabs = '';
+            $drop = '';
+        } else {
+            $tabs = $this->renderTabs();
+            $drop = $this->renderDropdownTabs();
+        }
+        $close = $this->closeTab ? $this->renderCloseTab() : '';
+        $refresh = $this->renderRefreshTab();
+
+        return str_replace(
+            array(
+                '{TABS}',
+                '{DROPDOWN}',
+                '{REFRESH}',
+                '{CLOSE}'
+            ),
+            array(
+                $tabs,
+                $drop,
+                $refresh,
+                $close
+            ),
+            $this->baseTpl
+        );
+    }
+
+    public function __toString()
+    {
+        try {
+            $html = $this->render();
+        } catch (Exception $e) {
+            return htmlspecialchars($e->getMessage());
+        }
+        return $html;
+    }
+
+    /**
+     * Return the number of tabs
+     *
+     * @return  int
+     *
+     * @see     Countable
+     */
+    public function count(): int
+    {
+        return count($this->tabs);
+    }
+
+    /**
+     * Return all tabs contained in this tab panel
+     *
+     * @return array
+     */
+    public function getTabs()
+    {
+        return $this->tabs;
+    }
+
+    /**
+     * Whether to hide all elements except of the close button
+     *
+     * @param   bool    $value
+     * @return  Tabs            fluent interface
+     */
+    public function showOnlyCloseButton($value = true)
+    {
+        $this->closeButtonOnly = $value;
+        return $this;
+    }
+
+    /**
+     * Apply a Tabextension on this tabs object
+     *
+     * @param   Tabextension $tabextension
+     *
+     * @return  $this
+     */
+    public function extend(Tabextension $tabextension)
+    {
+        $tabextension->apply($this);
+        return $this;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Widget.php b/library/Icinga/Web/Widget/Widget.php
new file mode 100644
index 0000000..879858a
--- /dev/null
+++ b/library/Icinga/Web/Widget/Widget.php
@@ -0,0 +1,24 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Web\View;
+use Zend_View_Abstract;
+
+/**
+ * Abstract class for reusable view elements that can be
+ * rendered to a view
+ *
+ */
+interface Widget
+{
+    /**
+     * Renders this widget via the given view and returns the
+     * HTML as a string
+     *
+     * @param \Zend_View_Abstract $view
+     * @return string
+     */
+    // public function render(Zend_View_Abstract $view);
+}
diff --git a/library/Icinga/Web/Window.php b/library/Icinga/Web/Window.php
new file mode 100644
index 0000000..158483a
--- /dev/null
+++ b/library/Icinga/Web/Window.php
@@ -0,0 +1,125 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Application\Icinga;
+use Icinga\Web\Session\SessionNamespace;
+
+class Window
+{
+    const UNDEFINED = 'undefined';
+
+    /** @var Window */
+    protected static $window;
+
+    /** @var string */
+    protected $id;
+
+    /** @var string */
+    protected $containerId;
+
+    public function __construct($id)
+    {
+        $parts = explode('_', $id, 2);
+        if (isset($parts[1])) {
+            $this->id = $parts[0];
+            $this->containerId = $id;
+        } else {
+            $this->id = $id;
+        }
+    }
+
+    /**
+     * Get whether the window's ID is undefined
+     *
+     * @return bool
+     */
+    public function isUndefined()
+    {
+        return $this->id === self::UNDEFINED;
+    }
+
+    /**
+     * Get the window's ID
+     *
+     * @return string
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Get the container's ID
+     *
+     * @return string
+     */
+    public function getContainerId()
+    {
+        return $this->containerId ?: $this->id;
+    }
+
+    /**
+     * Return a window-aware session by using the given prefix
+     *
+     * @param   string      $prefix     The prefix to use
+     * @param   bool        $reset      Whether to reset any existing session-data
+     *
+     * @return  SessionNamespace
+     */
+    public function getSessionNamespace($prefix, $reset = false)
+    {
+        $session = Session::getSession();
+
+        $identifier = $prefix . '_' . $this->getId();
+        if ($reset && $session->hasNamespace($identifier)) {
+            $session->removeNamespace($identifier);
+        }
+
+        $namespace = $session->getNamespace($identifier);
+        $nsUndef = $prefix . '_' . self::UNDEFINED;
+
+        if (! $reset && ! $this->isUndefined() && $session->hasNamespace($nsUndef)) {
+            // We may not have any window-id on the very first request. Now we add
+            // all values from the namespace, that has been created in this case,
+            // to the new one and remove it afterwards.
+            foreach ($session->getNamespace($nsUndef) as $name => $value) {
+                $namespace->set($name, $value);
+            }
+
+            $session->removeNamespace($nsUndef);
+        }
+
+        return $namespace;
+    }
+
+    /**
+     * Generate a random string
+     *
+     * @return string
+     */
+    public static function generateId()
+    {
+        $letters = 'abcefghijklmnopqrstuvwxyz';
+        return substr(str_shuffle($letters), 0, 12);
+    }
+
+    /**
+     * @return Window
+     */
+    public static function getInstance()
+    {
+        if (! isset(static::$window)) {
+            $id = Icinga::app()->getRequest()->getHeader('X-Icinga-WindowId');
+            if (empty($id) || $id === static::UNDEFINED) {
+                Icinga::app()->getResponse()->setOverrideWindowId();
+                $id = static::generateId();
+            }
+
+            static::$window = new Window($id);
+        }
+
+        return static::$window;
+    }
+}
diff --git a/library/Icinga/Web/Wizard.php b/library/Icinga/Web/Wizard.php
new file mode 100644
index 0000000..9a1b8b6
--- /dev/null
+++ b/library/Icinga/Web/Wizard.php
@@ -0,0 +1,720 @@
+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+use Icinga\Forms\ConfigForm;
+use Icinga\Module\Setup\Forms\ModulePage;
+use LogicException;
+use InvalidArgumentException;
+use Icinga\Web\Session\SessionNamespace;
+use Icinga\Web\Form\Decorator\ElementDoubler;
+
+/**
+ * Container and controller for form based wizards
+ */
+class Wizard
+{
+    /**
+     * An integer describing the wizard's forward direction
+     */
+    const FORWARD = 0;
+
+    /**
+     * An integer describing the wizard's backward direction
+     */
+    const BACKWARD = 1;
+
+    /**
+     * An integer describing that the wizard does not change its position
+     */
+    const NO_CHANGE = 2;
+
+    /**
+     * The name of the button to advance the wizard's position
+     */
+    const BTN_NEXT = 'btn_next';
+
+    /**
+     * The name of the button to rewind the wizard's position
+     */
+    const BTN_PREV = 'btn_prev';
+
+    /**
+     * The name and id of the element for showing the user an activity indicator when advancing the wizard
+     */
+    const PROGRESS_ELEMENT = 'wizard_progress';
+
+    /**
+     * This wizard's parent
+     *
+     * @var Wizard
+     */
+    protected $parent;
+
+    /**
+     * The name of the wizard's current page
+     *
+     * @var string
+     */
+    protected $currentPage;
+
+    /**
+     * The pages being part of this wizard
+     *
+     * @var array
+     */
+    protected $pages = array();
+
+    /**
+     * Initialize a new wizard
+     */
+    public function __construct()
+    {
+        $this->init();
+    }
+
+    /**
+     * Run additional initialization routines
+     *
+     * Should be implemented by subclasses to add pages to the wizard.
+     */
+    protected function init()
+    {
+    }
+
+    /**
+     * Return this wizard's parent or null in case it has none
+     *
+     * @return  Wizard|null
+     */
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    /**
+     * Set this wizard's parent
+     *
+     * @param   Wizard  $wizard     The parent wizard
+     *
+     * @return  $this
+     */
+    public function setParent(Wizard $wizard)
+    {
+        $this->parent = $wizard;
+        return $this;
+    }
+
+    /**
+     * Return the pages being part of this wizard
+     *
+     * In case this is a nested wizard a flattened array of all contained pages is returned.
+     *
+     * @return  array
+     */
+    public function getPages()
+    {
+        $pages = array();
+        foreach ($this->pages as $page) {
+            if ($page instanceof self) {
+                $pages = array_merge($pages, $page->getPages());
+            } else {
+                $pages[] = $page;
+            }
+        }
+
+        return $pages;
+    }
+
+    /**
+     * Return the page with the given name
+     *
+     * Note that it's also possible to retrieve a nested wizard's page by using this method.
+     *
+     * @param   string                 $name    The name of the page to return
+     *
+     * @return  ModulePage|Form|null            The page or null in case there is no page with the given name
+     */
+    public function getPage($name)
+    {
+        foreach ($this->getPages() as $page) {
+            if ($name === $page->getName()) {
+                return $page;
+            }
+        }
+    }
+
+    /**
+     * Add a new page or wizard to this wizard
+     *
+     * @param   Form|Wizard     $page   The page or wizard to add to the wizard
+     *
+     * @return  $this
+     */
+    public function addPage($page)
+    {
+        if (! $page instanceof Form && ! $page instanceof self) {
+            throw new InvalidArgumentException(
+                'The $page argument must be an instance of Icinga\Web\Form '
+                . 'or Icinga\Web\Wizard but is of type: ' . get_class($page)
+            );
+        } elseif ($page instanceof self) {
+            $page->setParent($this);
+        }
+
+        $this->pages[] = $page;
+        return $this;
+    }
+
+    /**
+     * Add multiple pages or wizards to this wizard
+     *
+     * @param   array   $pages      The pages or wizards to add to the wizard
+     *
+     * @return  $this
+     */
+    public function addPages(array $pages)
+    {
+        foreach ($pages as $page) {
+            $this->addPage($page);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Assert that this wizard has any pages
+     *
+     * @throws  LogicException      In case this wizard has no pages
+     */
+    protected function assertHasPages()
+    {
+        $pages = $this->getPages();
+        if (count($pages) < 2) {
+            throw new LogicException("Although Chuck Norris can advance a wizard with less than two pages, you can't.");
+        }
+    }
+
+    /**
+     * Return the current page of this wizard
+     *
+     * @return  Form
+     *
+     * @throws  LogicException      In case the name of the current page currently being set is invalid
+     */
+    public function getCurrentPage()
+    {
+        if ($this->parent) {
+            return $this->parent->getCurrentPage();
+        }
+
+        if ($this->currentPage === null) {
+            $this->assertHasPages();
+            $pages = $this->getPages();
+            $this->currentPage = $this->getSession()->get('current_page', $pages[0]->getName());
+        }
+
+        if (($page = $this->getPage($this->currentPage)) === null) {
+            throw new LogicException(sprintf('No page found with name "%s"', $this->currentPage));
+        }
+
+        return $page;
+    }
+
+    /**
+     * Set the current page of this wizard
+     *
+     * @param   Form    $page   The page to set as current page
+     *
+     * @return  $this
+     */
+    public function setCurrentPage(Form $page)
+    {
+        $this->currentPage = $page->getName();
+        $this->getSession()->set('current_page', $this->currentPage);
+        return $this;
+    }
+
+    /**
+     * Setup the given page that is either going to be displayed or validated
+     *
+     * Implement this method in a subclass to populate default values and/or other data required to process the form.
+     *
+     * @param   Form        $page       The page to setup
+     * @param   Request     $request    The current request
+     */
+    public function setupPage(Form $page, Request $request)
+    {
+    }
+
+    /**
+     * Process the given request using this wizard
+     *
+     * Validate the request data using the current page, update the wizard's
+     * position and redirect to the page's redirect url upon success.
+     *
+     * @param   Request     $request    The request to be processed
+     *
+     * @return  Request                 The request supposed to be processed
+     */
+    public function handleRequest(Request $request = null)
+    {
+        $page = $this->getCurrentPage();
+
+        if (($wizard = $this->findWizard($page)) !== null) {
+            return $wizard->handleRequest($request);
+        }
+
+        if ($request === null) {
+            $request = $page->getRequest();
+        }
+
+        $this->setupPage($page, $request);
+        $requestData = $this->getRequestData($page, $request);
+        if ($page->wasSent($requestData)) {
+            if (($requestedPage = $this->getRequestedPage($requestData)) !== null) {
+                $isValid = false;
+                $direction = $this->getDirection($request);
+                if ($direction === static::FORWARD && $page->isValid($requestData)) {
+                    $isValid = true;
+                    if ($this->isLastPage($page)) {
+                        $this->setIsFinished();
+                    }
+                } elseif ($direction === static::BACKWARD) {
+                    $page->populate($requestData);
+                    $isValid = true;
+                }
+
+                if ($isValid) {
+                    $pageData = & $this->getPageData();
+                    $pageData[$page->getName()] = ConfigForm::transformEmptyValuesToNull($page->getValues());
+                    $this->setCurrentPage($this->getNewPage($requestedPage, $page));
+                    $page->getResponse()->redirectAndExit($page->getRedirectUrl());
+                }
+            } elseif ($page->getValidatePartial()) {
+                $page->isValidPartial($requestData);
+            } else {
+                $page->populate($requestData);
+            }
+        } elseif (($pageData = $this->getPageData($page->getName())) !== null) {
+            $page->populate($pageData);
+        }
+
+        return $request;
+    }
+
+    /**
+     * Return the wizard for the given page or null if its not part of a wizard
+     *
+     * @param   Form    $page   The page to return its wizard for
+     *
+     * @return  Wizard|null
+     */
+    protected function findWizard(Form $page)
+    {
+        foreach ($this->getWizards() as $wizard) {
+            if ($wizard->getPage($page->getName()) === $page) {
+                return $wizard;
+            }
+        }
+    }
+
+    /**
+     * Return this wizard's child wizards
+     *
+     * @return  array
+     */
+    protected function getWizards()
+    {
+        $wizards = array();
+        foreach ($this->pages as $pageOrWizard) {
+            if ($pageOrWizard instanceof self) {
+                $wizards[] = $pageOrWizard;
+            }
+        }
+
+        return $wizards;
+    }
+
+    /**
+     * Return the request data based on given form's request method
+     *
+     * @param   Form        $page       The page to fetch the data for
+     * @param   Request     $request    The request to fetch the data from
+     *
+     * @return  array
+     */
+    protected function getRequestData(Form $page, Request $request)
+    {
+        if (strtolower($request->getMethod()) === $page->getMethod()) {
+            return $request->{'get' . ($request->isPost() ? 'Post' : 'Query')}();
+        }
+
+        return array();
+    }
+
+    /**
+     * Return the name of the requested page
+     *
+     * @param   array   $requestData    The request's data
+     *
+     * @return  null|string             The name of the requested page or null in case no page has been requested
+     */
+    protected function getRequestedPage(array $requestData)
+    {
+        if ($this->parent) {
+            return $this->parent->getRequestedPage($requestData);
+        }
+
+        if (isset($requestData[static::BTN_NEXT])) {
+            return $requestData[static::BTN_NEXT];
+        } elseif (isset($requestData[static::BTN_PREV])) {
+            return $requestData[static::BTN_PREV];
+        }
+    }
+
+    /**
+     * Return the direction of this wizard using the given request
+     *
+     * @param   Request     $request    The request to use
+     *
+     * @return  int                     The direction @see Wizard::FORWARD @see Wizard::BACKWARD @see Wizard::NO_CHANGE
+     */
+    protected function getDirection(Request $request = null)
+    {
+        if ($this->parent) {
+            return $this->parent->getDirection($request);
+        }
+
+        $currentPage = $this->getCurrentPage();
+
+        if ($request === null) {
+            $request = $currentPage->getRequest();
+        }
+
+        $requestData = $this->getRequestData($currentPage, $request);
+        if (isset($requestData[static::BTN_NEXT])) {
+            return static::FORWARD;
+        } elseif (isset($requestData[static::BTN_PREV])) {
+            return static::BACKWARD;
+        }
+
+        return static::NO_CHANGE;
+    }
+
+    /**
+     * Return the new page to set as current page
+     *
+     * Permission is checked by verifying that the requested page or its previous page has page data available.
+     * The requested page is automatically permitted without any checks if the origin page is its previous
+     * page or one that occurs later in order.
+     *
+     * @param   string  $requestedPage      The name of the requested page
+     * @param   Form    $originPage         The origin page
+     *
+     * @return  Form                        The new page
+     *
+     * @throws  InvalidArgumentException    In case the requested page does not exist or is not permitted yet
+     */
+    protected function getNewPage($requestedPage, Form $originPage)
+    {
+        if ($this->parent) {
+            return $this->parent->getNewPage($requestedPage, $originPage);
+        }
+
+        if (($page = $this->getPage($requestedPage)) !== null) {
+            $permitted = true;
+
+            $pages = $this->getPages();
+            if (! $this->hasPageData($requestedPage) && ($index = array_search($page, $pages, true)) > 0) {
+                $previousPage = $pages[$index - 1];
+                if ($originPage === null || ($previousPage->getName() !== $originPage->getName()
+                    && array_search($originPage, $pages, true) < $index)) {
+                    $permitted = $this->hasPageData($previousPage->getName());
+                }
+            }
+
+            if ($permitted) {
+                return $page;
+            }
+        }
+
+        throw new InvalidArgumentException(
+            sprintf('"%s" is either an unknown page or one you are not permitted to view', $requestedPage)
+        );
+    }
+
+    /**
+     * Return the next or previous page based on the given one
+     *
+     * @param   Form    $page   The page to skip
+     *
+     * @return  Form
+     */
+    protected function skipPage(Form $page)
+    {
+        if ($this->parent) {
+            return $this->parent->skipPage($page);
+        }
+
+        if ($this->hasPageData($page->getName())) {
+            $pageData = & $this->getPageData();
+            unset($pageData[$page->getName()]);
+        }
+
+        $pages = $this->getPages();
+        if ($this->getDirection() === static::FORWARD) {
+            $nextPage = $pages[array_search($page, $pages, true) + 1];
+            $newPage = $this->getNewPage($nextPage->getName(), $page);
+        } else { // $this->getDirection() === static::BACKWARD
+            $previousPage = $pages[array_search($page, $pages, true) - 1];
+            $newPage = $this->getNewPage($previousPage->getName(), $page);
+        }
+
+        return $newPage;
+    }
+
+    /**
+     * Return whether the given page is this wizard's last page
+     *
+     * @param   Form    $page   The page to check
+     *
+     * @return  bool
+     */
+    protected function isLastPage(Form $page)
+    {
+        if ($this->parent) {
+            return $this->parent->isLastPage($page);
+        }
+
+        $pages = $this->getPages();
+        return $page->getName() === end($pages)->getName();
+    }
+
+    /**
+     * Return whether all of this wizard's pages were visited by the user
+     *
+     * The base implementation just verifies that the very last page has page data available.
+     *
+     * @return  bool
+     */
+    public function isComplete()
+    {
+        $pages = $this->getPages();
+        return $this->hasPageData($pages[count($pages) - 1]->getName());
+    }
+
+    /**
+     * Set whether this wizard has been completed
+     *
+     * @param   bool    $state      Whether this wizard has been completed
+     *
+     * @return  $this
+     */
+    public function setIsFinished($state = true)
+    {
+        $this->getSession()->set('isFinished', $state);
+        return $this;
+    }
+
+    /**
+     * Return whether this wizard has been completed
+     *
+     * @return  bool
+     */
+    public function isFinished()
+    {
+        return $this->getSession()->get('isFinished', false);
+    }
+
+    /**
+     * Return the overall page data or one for a particular page
+     *
+     * Note that this method returns by reference so in order to update the
+     * returned array set this method's return value also by reference.
+     *
+     * @param   string  $pageName   The page for which to return the data
+     *
+     * @return  array
+     */
+    public function & getPageData($pageName = null)
+    {
+        $session = $this->getSession();
+
+        if (false === isset($session->page_data)) {
+            $session->page_data = array();
+        }
+
+        $pageData = & $session->getByRef('page_data');
+        if ($pageName !== null) {
+            $data = null;
+            if (isset($pageData[$pageName])) {
+                $data = & $pageData[$pageName];
+            }
+
+            return $data;
+        }
+
+        return $pageData;
+    }
+
+    /**
+     * Return whether there is any data for the given page
+     *
+     * @param   string  $pageName   The name of the page to check
+     *
+     * @return  bool
+     */
+    public function hasPageData($pageName)
+    {
+        return $this->getPageData($pageName) !== null;
+    }
+
+    /**
+     * Return a session to be used by this wizard
+     *
+     * @return  SessionNamespace
+     */
+    public function getSession()
+    {
+        if ($this->parent) {
+            return $this->parent->getSession();
+        }
+
+        return Session::getSession()->getNamespace(get_class($this));
+    }
+
+    /**
+     * Clear the session being used by this wizard
+     */
+    public function clearSession()
+    {
+        $this->getSession()->clear();
+    }
+
+    /**
+     * Add buttons to the given page based on its position in the page-chain
+     *
+     * @param   Form    $page   The page to add the buttons to
+     */
+    protected function addButtons(Form $page)
+    {
+        $pages = $this->getPages();
+        $index = array_search($page, $pages, true);
+        if ($index === 0) {
+            $page->addElement(
+                'button',
+                static::BTN_NEXT,
+                array(
+                    'class'         => 'control-button btn-primary',
+                    'type'          => 'submit',
+                    'value'         => $pages[1]->getName(),
+                    'label'         => t('Next'),
+                    'decorators'    => array('ViewHelper', 'Spinner')
+                )
+            );
+        } elseif ($index < count($pages) - 1) {
+            $page->addElement(
+                'button',
+                static::BTN_PREV,
+                array(
+                    'class'             => 'control-button',
+                    'type'              => 'submit',
+                    'value'             => $pages[$index - 1]->getName(),
+                    'label'             => t('Back'),
+                    'decorators'        => array('ViewHelper'),
+                    'formnovalidate'    => 'formnovalidate'
+                )
+            );
+            $page->addElement(
+                'button',
+                static::BTN_NEXT,
+                array(
+                    'class'         => 'control-button btn-primary',
+                    'type'          => 'submit',
+                    'value'         => $pages[$index + 1]->getName(),
+                    'label'         => t('Next'),
+                    'decorators'    => array('ViewHelper')
+                )
+            );
+        } else {
+            $page->addElement(
+                'button',
+                static::BTN_PREV,
+                array(
+                    'class'             => 'control-button',
+                    'type'              => 'submit',
+                    'value'             => $pages[$index - 1]->getName(),
+                    'label'             => t('Back'),
+                    'decorators'        => array('ViewHelper'),
+                    'formnovalidate'    => 'formnovalidate'
+                )
+            );
+            $page->addElement(
+                'button',
+                static::BTN_NEXT,
+                array(
+                    'class'         => 'control-button btn-primary',
+                    'type'          => 'submit',
+                    'value'         => $page->getName(),
+                    'label'         => t('Finish'),
+                    'decorators'    => array('ViewHelper')
+                )
+            );
+        }
+
+        $page->setAttrib('data-progress-element', static::PROGRESS_ELEMENT);
+        $page->addElement(
+            'note',
+            static::PROGRESS_ELEMENT,
+            array(
+                'order'         => 99, // Ensures that it's shown on the right even if a sub-class adds another button
+                'decorators'    => array(
+                    'ViewHelper',
+                    array('Spinner', array('id' => static::PROGRESS_ELEMENT))
+                )
+            )
+        );
+
+        $page->addDisplayGroup(
+            array(static::BTN_PREV, static::BTN_NEXT, static::PROGRESS_ELEMENT),
+            'buttons',
+            array(
+                'decorators' => array(
+                    'FormElements',
+                    new ElementDoubler(array(
+                        'double'        => static::BTN_NEXT,
+                        'condition'     => static::BTN_PREV,
+                        'placement'     => ElementDoubler::PREPEND,
+                        'attributes'    => array('tabindex' => -1, 'class' => 'double')
+                    )),
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'buttons'))
+                )
+            )
+        );
+    }
+
+    /**
+     * Return the current page of this wizard with appropriate buttons being added
+     *
+     * @return  Form
+     */
+    public function getForm()
+    {
+        $form = $this->getCurrentPage();
+        $form->create(); // Make sure that buttons are displayed at the very bottom
+        $this->addButtons($form);
+        return $form;
+    }
+
+    /**
+     * Return the current page of this wizard rendered as HTML
+     *
+     * @return  string
+     */
+    public function __toString()
+    {
+        return (string) $this->getForm();
+    }
+}