Adding upstream version 1.1.1.upstream/1.1.1

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

21 files changed, 2862 insertions, 0 deletions

diff --git a/application/forms/ApiTransportForm.php b/application/forms/ApiTransportForm.php
new file mode 100644
index 0000000..27c147b
--- /dev/null
+++ b/application/forms/ApiTransportForm.php
@@ -0,0 +1,102 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms;
+
+use Icinga\Data\ConfigObject;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransport;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransportException;
+use Icinga\Web\Session;
+use ipl\Web\Common\CsrfCounterMeasure;
+use ipl\Web\Compat\CompatForm;
+
+class ApiTransportForm extends CompatForm
+{
+    use CsrfCounterMeasure;
+
+    protected function assemble()
+    {
+        // TODO: Use a validator to check if a name is not already in use
+        $this->addElement('text', 'name', [
+            'required'      => true,
+            'label'         => t('Transport Name')
+        ]);
+
+        $this->addElement('hidden', 'transport', [
+            'value' => 'api'
+        ]);
+
+        $this->addElement('text', 'host', [
+            'required'      => true,
+            'id'            => 'api_transport_host',
+            'label'         => t('Host'),
+            'description'   => t('Hostname or address of the Icinga master')
+        ]);
+
+        // TODO: Don't rely only on browser validation
+        $this->addElement('number', 'port', [
+            'required'          => true,
+            'label'             => t('Port'),
+            'value'             => 5665,
+            'min'               => 1,
+            'max'               => 65536
+        ]);
+
+        $this->addElement('text', 'username', [
+            'required'      => true,
+            'label'         => t('API Username'),
+            'description'   => t('User to authenticate with using HTTP Basic Auth')
+        ]);
+
+        $this->addElement('password', 'password', [
+            'required'      => true,
+            'autocomplete'  => 'new-password',
+            'label'         => t('API Password')
+        ]);
+
+        $this->addElement('submit', 'btn_submit', [
+            'label' => t('Save')
+        ]);
+
+        $this->addElement($this->createCsrfCounterMeasure(Session::getSession()->getId()));
+    }
+
+    public function validate()
+    {
+        parent::validate();
+        if (! $this->isValid) {
+            return $this;
+        }
+
+        if ($this->getPopulatedValue('force_creation') === 'y') {
+            return $this;
+        }
+
+        try {
+            CommandTransport::createTransport(new ConfigObject($this->getValues()))->probe();
+        } catch (CommandTransportException $e) {
+            $this->addMessage(
+                sprintf(t('Failed to successfully validate the configuration: %s'), $e->getMessage())
+            );
+
+            $forceCheckbox = $this->createElement(
+                'checkbox',
+                'force_creation',
+                [
+                    'ignore'        => true,
+                    'label'         => t('Force Changes'),
+                    'description'   => t('Check this box to enforce changes without connectivity validation')
+                ]
+            );
+
+            $this->registerElement($forceCheckbox);
+            $this->decorate($forceCheckbox);
+            $this->prepend($forceCheckbox);
+
+            $this->isValid = false;
+        }
+
+        return $this;
+    }
+}
diff --git a/application/forms/Command/CommandForm.php b/application/forms/Command/CommandForm.php
new file mode 100644
index 0000000..a535c6d
--- /dev/null
+++ b/application/forms/Command/CommandForm.php
@@ -0,0 +1,179 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command;
+
+use ArrayIterator;
+use Exception;
+use Generator;
+use Icinga\Application\Logger;
+use Icinga\Module\Icingadb\Command\IcingaCommand;
+use Icinga\Module\Icingadb\Command\Transport\CommandTransport;
+use Icinga\Module\Icingadb\Common\Auth;
+use Icinga\Web\Notification;
+use Icinga\Web\Session;
+use ipl\Html\Form;
+use ipl\Orm\Model;
+use ipl\Web\Common\CsrfCounterMeasure;
+use Traversable;
+
+abstract class CommandForm extends Form
+{
+    use Auth;
+    use CsrfCounterMeasure;
+
+    protected $defaultAttributes = ['class' => 'icinga-form icinga-controls'];
+
+    /** @var mixed */
+    protected $objects;
+
+    /** @var bool */
+    protected $isApiTarget = false;
+
+    /**
+     * Whether an error occurred while sending the command
+     *
+     * Prevents the success message from being rendered simultaneously
+     *
+     * @var bool
+     */
+    protected $errorOccurred = false;
+
+    /**
+     * Set the objects to issue the command for
+     *
+     * @param mixed $objects A traversable that is also countable
+     *
+     * @return $this
+     */
+    public function setObjects($objects): self
+    {
+        $this->objects = $objects;
+
+        return $this;
+    }
+
+    /**
+     * Get the objects to issue the command for
+     *
+     * @return mixed
+     */
+    public function getObjects()
+    {
+        return $this->objects;
+    }
+
+    /**
+     * Set whether this form is an API target
+     *
+     * @param bool $state
+     *
+     * @return $this
+     */
+    public function setIsApiTarget(bool $state = true): self
+    {
+        $this->isApiTarget = $state;
+
+        return $this;
+    }
+
+    /**
+     * Get whether this form is an API target
+     *
+     * @return bool
+     */
+    public function isApiTarget(): bool
+    {
+        return $this->isApiTarget;
+    }
+
+    /**
+     * Create and add form elements representing the command's options
+     *
+     * @return void
+     */
+    abstract protected function assembleElements();
+
+    /**
+     * Create and add a submit button to the form
+     *
+     * @return void
+     */
+    abstract protected function assembleSubmitButton();
+
+    /**
+     * Get the commands to issue for the given objects
+     *
+     * @param Traversable<Model> $objects
+     *
+     * @return Traversable<IcingaCommand>
+     */
+    abstract protected function getCommands(Traversable $objects): Traversable;
+
+    protected function assemble()
+    {
+        $this->assembleElements();
+
+        if (! $this->isApiTarget()) {
+            $this->assembleSubmitButton();
+            $this->addElement($this->createCsrfCounterMeasure(Session::getSession()->getId()));
+        }
+    }
+
+    protected function onSuccess()
+    {
+        $errors = [];
+        $objects = $this->getObjects();
+
+        foreach ($this->getCommands(is_array($objects) ? new ArrayIterator($objects) : $objects) as $command) {
+            try {
+                $this->sendCommand($command);
+            } catch (Exception $e) {
+                Logger::error($e->getMessage());
+                $errors[] = $e->getMessage();
+            }
+        }
+
+        if (! empty($errors)) {
+            if (count($errors) > 1) {
+                Notification::warning(
+                    t('Some commands were not transmitted. Please check the log. The first error follows.')
+                );
+            }
+
+            $this->errorOccurred = true;
+
+            Notification::error($errors[0]);
+        }
+    }
+
+    /**
+     * Transmit the given command
+     *
+     * @param IcingaCommand $command
+     *
+     * @return void
+     */
+    protected function sendCommand(IcingaCommand $command)
+    {
+        (new CommandTransport())->send($command);
+    }
+
+    /**
+     * Yield the $objects the currently logged in user has the permission $permission for
+     *
+     * @param string      $permission
+     * @param Traversable $objects
+     *
+     * @return Generator
+     */
+    protected function filterGrantedOn(string $permission, Traversable $objects): Generator
+    {
+        foreach ($objects as $object) {
+            if ($this->isGrantedOn($permission, $object)) {
+                yield $object;
+            }
+        }
+    }
+}
diff --git a/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php b/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php
new file mode 100644
index 0000000..cf14db8
--- /dev/null
+++ b/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php
@@ -0,0 +1,154 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Instance;
+
+use Icinga\Module\Icingadb\Command\Instance\ToggleInstanceFeatureCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Traversable;
+
+class ToggleInstanceFeaturesForm extends CommandForm
+{
+    protected $features;
+
+    protected $featureStatus;
+
+    /**
+     * ToggleFeature(s) being used to submit this form
+     *
+     * @var ToggleInstanceFeatureCommand[]
+     */
+    protected $submittedFeatures = [];
+
+    public function __construct(array $featureStatus)
+    {
+        $this->featureStatus = $featureStatus;
+        $this->features = [
+            ToggleInstanceFeatureCommand::FEATURE_ACTIVE_HOST_CHECKS =>
+                t('Active Host Checks'),
+            ToggleInstanceFeatureCommand::FEATURE_ACTIVE_SERVICE_CHECKS =>
+                t('Active Service Checks'),
+            ToggleInstanceFeatureCommand::FEATURE_EVENT_HANDLERS =>
+                t('Event Handlers'),
+            ToggleInstanceFeatureCommand::FEATURE_FLAP_DETECTION =>
+                t('Flap Detection'),
+            ToggleInstanceFeatureCommand::FEATURE_NOTIFICATIONS =>
+                t('Notifications'),
+            ToggleInstanceFeatureCommand::FEATURE_PERFORMANCE_DATA =>
+                t('Performance Data')
+        ];
+
+        $this->getAttributes()->add('class', 'instance-features');
+
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            foreach ($this->submittedFeatures as $feature) {
+                $enabled = $feature->getEnabled();
+                switch ($feature->getFeature()) {
+                    case ToggleInstanceFeatureCommand::FEATURE_ACTIVE_HOST_CHECKS:
+                        if ($enabled) {
+                            $message = t('Enabled active host checks successfully');
+                        } else {
+                            $message = t('Disabled active host checks successfully');
+                        }
+
+                        break;
+                    case ToggleInstanceFeatureCommand::FEATURE_ACTIVE_SERVICE_CHECKS:
+                        if ($enabled) {
+                            $message = t('Enabled active service checks successfully');
+                        } else {
+                            $message = t('Disabled active service checks successfully');
+                        }
+
+                        break;
+                    case ToggleInstanceFeatureCommand::FEATURE_EVENT_HANDLERS:
+                        if ($enabled) {
+                            $message = t('Enabled event handlers successfully');
+                        } else {
+                            $message = t('Disabled event handlers checks successfully');
+                        }
+
+                        break;
+                    case ToggleInstanceFeatureCommand::FEATURE_FLAP_DETECTION:
+                        if ($enabled) {
+                            $message = t('Enabled flap detection successfully');
+                        } else {
+                            $message = t('Disabled flap detection successfully');
+                        }
+
+                        break;
+                    case ToggleInstanceFeatureCommand::FEATURE_NOTIFICATIONS:
+                        if ($enabled) {
+                            $message = t('Enabled notifications successfully');
+                        } else {
+                            $message = t('Disabled notifications successfully');
+                        }
+
+                        break;
+                    case ToggleInstanceFeatureCommand::FEATURE_PERFORMANCE_DATA:
+                        if ($enabled) {
+                            $message = t('Enabled performance data successfully');
+                        } else {
+                            $message = t('Disabled performance data successfully');
+                        }
+
+                        break;
+                    default:
+                        $message = t('Invalid feature option');
+                        break;
+                }
+
+                Notification::success($message);
+            }
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $disabled = ! $this->getAuth()->hasPermission('icingadb/command/feature/instance');
+        $decorator = new IcingaFormDecorator();
+
+        foreach ($this->features as $feature => $label) {
+            $this->addElement(
+                'checkbox',
+                $feature,
+                [
+                    'class'     => 'autosubmit',
+                    'label'     => $label,
+                    'disabled'  => $disabled,
+                    'value'     => (bool) $this->featureStatus[$feature]
+                ]
+            );
+            $decorator->decorate($this->getElement($feature));
+        }
+    }
+
+    protected function assembleSubmitButton()
+    {
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        foreach ($this->features as $feature => $spec) {
+            $featureState = $this->getElement($feature)->isChecked();
+
+            if ((int) $featureState === (int) $this->featureStatus[$feature]) {
+                continue;
+            }
+
+            $command = new ToggleInstanceFeatureCommand();
+            $command->setFeature($feature);
+            $command->setEnabled($featureState);
+
+            $this->submittedFeatures[] = $command;
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/AcknowledgeProblemForm.php b/application/forms/Command/Object/AcknowledgeProblemForm.php
new file mode 100644
index 0000000..81b93e2
--- /dev/null
+++ b/application/forms/Command/Object/AcknowledgeProblemForm.php
@@ -0,0 +1,210 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use DateInterval;
+use DateTime;
+use Icinga\Application\Config;
+use Icinga\Module\Icingadb\Command\Object\AcknowledgeProblemCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Validator\CallbackValidator;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class AcknowledgeProblemForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(tp(
+                    'Acknowledged problem successfully',
+                    'Acknowledged problem on %d hosts successfully',
+                    $countObjects
+                ), $countObjects);
+            } else {
+                $message = sprintf(tp(
+                    'Acknowledged problem successfully',
+                    'Acknowledged problem on %d services successfully',
+                    $countObjects
+                ), $countObjects);
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement('li', null, Text::create(t(
+                    'This command is used to acknowledge host or service problems. When a problem is acknowledged,'
+                    . ' future notifications about problems are temporarily disabled until the host or service'
+                    . ' recovers.'
+                )))
+            )
+        ));
+
+        $config = Config::module('icingadb');
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'textarea',
+            'comment',
+            [
+                'required'      => true,
+                'label'         => t('Comment'),
+                'description'   => t(
+                    'If you work with other administrators, you may find it useful to share information about'
+                    . ' the host or service that is having problems. Make sure you enter a brief description of'
+                    . ' what you are doing.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('comment'));
+
+        $this->addElement(
+            'checkbox',
+            'persistent',
+            [
+                'label'         => t('Persistent Comment'),
+                'value'         => (bool) $config->get('settings', 'acknowledge_persistent', false),
+                'description'   => t(
+                    'If you want the comment to remain even when the acknowledgement is removed, check this'
+                    . ' option.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('persistent'));
+
+        $this->addElement(
+            'checkbox',
+            'notify',
+            [
+                'label'         => t('Send Notification'),
+                'value'         => (bool) $config->get('settings', 'acknowledge_notify', true),
+                'description'   => t(
+                    'If you want an acknowledgement notification to be sent out to the appropriate contacts,'
+                    . ' check this option.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('notify'));
+
+        $this->addElement(
+            'checkbox',
+            'sticky',
+            [
+                'label'         => t('Sticky Acknowledgement'),
+                'value'         => (bool) $config->get('settings', 'acknowledge_sticky', false),
+                'description'   => t(
+                    'If you want the acknowledgement to remain until the host or service recovers even if the host'
+                    . ' or service changes state, check this option.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('sticky'));
+
+        $this->addElement(
+            'checkbox',
+            'expire',
+            [
+                'ignore'        => true,
+                'class'         => 'autosubmit',
+                'value'         => (bool) $config->get('settings', 'acknowledge_expire', false),
+                'label'         => t('Use Expire Time'),
+                'description'   => t('If the acknowledgement should expire, check this option.')
+            ]
+        );
+        $decorator->decorate($this->getElement('expire'));
+
+        if ($this->getElement('expire')->isChecked()) {
+            $expireTime = new DateTime();
+            $expireTime->add(new DateInterval($config->get('settings', 'acknowledge_expire_time', 'PT1H')));
+
+            $this->addElement(
+                'localDateTime',
+                'expire_time',
+                [
+                    'data-use-datetime-picker'  => true,
+                    'required'                  => true,
+                    'value'                     => $expireTime,
+                    'label'                     => t('Expire Time'),
+                    'description'               => t(
+                        'Choose the date and time when Icinga should delete the acknowledgement.'
+                    ),
+                    'validators'                => [
+                        'DateTime' => ['break_chain_on_failure' => true],
+                        'Callback' => function ($value, $validator) {
+                            /** @var CallbackValidator $validator */
+                            if ($value <= (new DateTime())) {
+                                $validator->addMessage(t('The expire time must not be in the past'));
+                                return false;
+                            }
+
+                            return true;
+                        }
+                    ]
+                ]
+            );
+            $decorator->decorate($this->getElement('expire_time'));
+        }
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp('Acknowledge problem', 'Acknowledge problems', count($this->getObjects()))
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/acknowledge-problem', $objects);
+
+        if ($granted->valid()) {
+            $command = new AcknowledgeProblemCommand();
+            $command->setObjects($granted);
+            $command->setComment($this->getValue('comment'));
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+            $command->setNotify($this->getElement('notify')->isChecked());
+            $command->setSticky($this->getElement('sticky')->isChecked());
+            $command->setPersistent($this->getElement('persistent')->isChecked());
+
+            if (($expireTime = $this->getValue('expire_time')) !== null) {
+                /** @var DateTime $expireTime */
+                $command->setExpireTime($expireTime->getTimestamp());
+            }
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/AddCommentForm.php b/application/forms/Command/Object/AddCommentForm.php
new file mode 100644
index 0000000..9cd0754
--- /dev/null
+++ b/application/forms/Command/Object/AddCommentForm.php
@@ -0,0 +1,162 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use DateInterval;
+use DateTime;
+use Icinga\Application\Config;
+use Icinga\Module\Icingadb\Command\Object\AddCommentCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Validator\CallbackValidator;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class AddCommentForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(
+                    tp('Added comment successfully', 'Added comment to %d hosts successfully', $countObjects),
+                    $countObjects
+                );
+            } else {
+                $message = sprintf(
+                    tp('Added comment successfully', 'Added comment to %d services successfully', $countObjects),
+                    $countObjects
+                );
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement(
+                    'li',
+                    null,
+                    Text::create(t('This command is used to add host or service comments.'))
+                )
+            )
+        ));
+
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'textarea',
+            'comment',
+            [
+                'required'      => true,
+                'label'         => t('Comment'),
+                'description'   => t(
+                    'If you work with other administrators, you may find it useful to share information about'
+                    . ' the host or service that is having problems. Make sure you enter a brief description of'
+                    . ' what you are doing.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('comment'));
+
+        $config = Config::module('icingadb');
+
+        $this->addElement(
+            'checkbox',
+            'expire',
+            [
+                'ignore'        => true,
+                'class'         => 'autosubmit',
+                'value'         => (bool) $config->get('settings', 'comment_expire', false),
+                'label'         => t('Use Expire Time'),
+                'description'   => t('If the comment should expire, check this option.')
+            ]
+        );
+        $decorator->decorate($this->getElement('expire'));
+
+        if ($this->getElement('expire')->isChecked()) {
+            $expireTime = new DateTime();
+            $expireTime->add(new DateInterval($config->get('settings', 'comment_expire_time', 'PT1H')));
+
+            $this->addElement(
+                'localDateTime',
+                'expire_time',
+                [
+                    'data-use-datetime-picker'  => true,
+                    'required'                  => true,
+                    'value'                     => $expireTime,
+                    'label'                     => t('Expire Time'),
+                    'description'               => t('Choose the date and time when Icinga should delete the comment.'),
+                    'validators'                => [
+                        'DateTime' => ['break_chain_on_failure' => true],
+                        'Callback' => function ($value, $validator) {
+                            /** @var CallbackValidator $validator */
+                            if ($value <= (new DateTime())) {
+                                $validator->addMessage(t('The expire time must not be in the past'));
+                                return false;
+                            }
+
+                            return true;
+                        }
+                    ]
+                ]
+            );
+            $decorator->decorate($this->getElement('expire_time'));
+        }
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp('Add comment', 'Add comments', count($this->getObjects()))
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/comment/add', $objects);
+
+        if ($granted->valid()) {
+            $command = new AddCommentCommand();
+            $command->setObjects($granted);
+            $command->setComment($this->getValue('comment'));
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+
+            if (($expireTime = $this->getValue('expire_time'))) {
+                /** @var DateTime $expireTime */
+                $command->setExpireTime($expireTime->getTimestamp());
+            }
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/CheckNowForm.php b/application/forms/Command/Object/CheckNowForm.php
new file mode 100644
index 0000000..b7a506c
--- /dev/null
+++ b/application/forms/Command/Object/CheckNowForm.php
@@ -0,0 +1,72 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Generator;
+use Icinga\Module\Icingadb\Command\Object\ScheduleCheckCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+class CheckNowForm extends CommandForm
+{
+    protected $defaultAttributes = ['class' => 'inline'];
+
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if (! $this->errorOccurred) {
+                Notification::success(tp('Scheduling check..', 'Scheduling checks..', count($this->getObjects())));
+            }
+        });
+    }
+
+    protected function assembleElements()
+    {
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submitButton',
+            'btn_submit',
+            [
+                'class' => ['link-button', 'spinner'],
+                'label' => [
+                    new Icon('sync-alt'),
+                    t('Check Now')
+                ],
+                'title' => t('Schedule the next active check to run immediately')
+            ]
+        );
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = (function () use ($objects): Generator {
+            foreach ($objects as $object) {
+                if (
+                    $this->isGrantedOn('icingadb/command/schedule-check', $object)
+                    || (
+                        $object->active_checks_enabled
+                        && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
+                    )
+                ) {
+                    yield $object;
+                }
+            }
+        })();
+
+        if ($granted->valid()) {
+            $command = new ScheduleCheckCommand();
+            $command->setObjects($granted);
+            $command->setCheckTime(time());
+            $command->setForced();
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/DeleteCommentForm.php b/application/forms/Command/Object/DeleteCommentForm.php
new file mode 100644
index 0000000..25275ba
--- /dev/null
+++ b/application/forms/Command/Object/DeleteCommentForm.php
@@ -0,0 +1,75 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Generator;
+use Icinga\Module\Icingadb\Command\Object\DeleteCommentCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Web\Common\RedirectOption;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+class DeleteCommentForm extends CommandForm
+{
+    use RedirectOption;
+
+    protected $defaultAttributes = ['class' => 'inline'];
+
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+
+            Notification::success(sprintf(
+                tp('Removed comment successfully', 'Removed comment from %d objects successfully', $countObjects),
+                $countObjects
+            ));
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addElement($this->createRedirectOption());
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submitButton',
+            'btn_submit',
+            [
+                'class' => ['cancel-button', 'spinner'],
+                'label' => [
+                    new Icon('trash'),
+                    tp('Remove Comment', 'Remove Comments', count($this->getObjects()))
+                ]
+            ]
+        );
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = (function () use ($objects): Generator {
+            foreach ($objects as $object) {
+                if ($this->isGrantedOn('icingadb/command/comment/delete', $object->{$object->object_type})) {
+                    yield $object;
+                }
+            }
+        })();
+
+        if ($granted->valid()) {
+            $command = new DeleteCommentCommand();
+            $command->setObjects($granted);
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/DeleteDowntimeForm.php b/application/forms/Command/Object/DeleteDowntimeForm.php
new file mode 100644
index 0000000..5f695b9
--- /dev/null
+++ b/application/forms/Command/Object/DeleteDowntimeForm.php
@@ -0,0 +1,90 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Generator;
+use Icinga\Module\Icingadb\Command\Object\DeleteDowntimeCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Web\Common\RedirectOption;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+class DeleteDowntimeForm extends CommandForm
+{
+    use RedirectOption;
+
+    protected $defaultAttributes = ['class' => 'inline'];
+
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+
+            Notification::success(sprintf(
+                tp('Removed downtime successfully', 'Removed downtime from %d objects successfully', $countObjects),
+                $countObjects
+            ));
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addElement($this->createRedirectOption());
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $isDisabled = true;
+        foreach ($this->getObjects() as $downtime) {
+            if ($downtime->scheduled_by === null) {
+                $isDisabled = false;
+                break;
+            }
+        }
+
+        $this->addElement(
+            'submitButton',
+            'btn_submit',
+            [
+                'class' => ['cancel-button', 'spinner'],
+                'disabled' => $isDisabled ?: null,
+                'title' => $isDisabled
+                    ? t('Downtime cannot be removed at runtime because it is based on a configured scheduled downtime.')
+                    : null,
+                'label' => [
+                    new Icon('trash'),
+                    tp('Delete downtime', 'Delete downtimes', count($this->getObjects()))
+                ]
+            ]
+        );
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = (function () use ($objects): Generator {
+            foreach ($objects as $object) {
+                if (
+                    $this->isGrantedOn('icingadb/command/downtime/delete', $object->{$object->object_type})
+                    && $object->scheduled_by === null
+                ) {
+                    yield $object;
+                }
+            }
+        })();
+
+        if ($granted->valid()) {
+            $command = new DeleteDowntimeCommand();
+            $command->setObjects($granted);
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/ProcessCheckResultForm.php b/application/forms/Command/Object/ProcessCheckResultForm.php
new file mode 100644
index 0000000..5764bf8
--- /dev/null
+++ b/application/forms/Command/Object/ProcessCheckResultForm.php
@@ -0,0 +1,156 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Generator;
+use Icinga\Module\Icingadb\Command\Object\ProcessCheckResultCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Orm\Model;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class ProcessCheckResultForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(tp(
+                    'Submitted passive check result successfully',
+                    'Submitted passive check result for %d hosts successfully',
+                    $countObjects
+                ), $countObjects);
+            } else {
+                $message = sprintf(tp(
+                    'Submitted passive check result successfully',
+                    'Submitted passive check result for %d services successfully',
+                    $countObjects
+                ), $countObjects);
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement(
+                    'li',
+                    null,
+                    Text::create(t('This command is used to submit passive host or service check results.'))
+                )
+            )
+        ));
+
+        $decorator = new IcingaFormDecorator();
+
+        /** @var Model $object */
+        $object = iterable_value_first($this->getObjects());
+
+        $this->addElement(
+            'select',
+            'status',
+            [
+                'required'      => true,
+                'label'         => t('Status'),
+                'description'   => t('The state this check result should report'),
+                'options'       => $object instanceof Host ? [
+                    ProcessCheckResultCommand::HOST_UP          => t('UP', 'icinga.state'),
+                    ProcessCheckResultCommand::HOST_DOWN        => t('DOWN', 'icinga.state')
+                ] : [
+                    ProcessCheckResultCommand::SERVICE_OK       => t('OK', 'icinga.state'),
+                    ProcessCheckResultCommand::SERVICE_WARNING  => t('WARNING', 'icinga.state'),
+                    ProcessCheckResultCommand::SERVICE_CRITICAL => t('CRITICAL', 'icinga.state'),
+                    ProcessCheckResultCommand::SERVICE_UNKNOWN  => t('UNKNOWN', 'icinga.state')
+                ]
+            ]
+        );
+        $decorator->decorate($this->getElement('status'));
+
+        $this->addElement(
+            'text',
+            'output',
+            [
+                'required'      => true,
+                'label'         => t('Output'),
+                'description'   => t('The plugin output of this check result')
+            ]
+        );
+        $decorator->decorate($this->getElement('output'));
+
+        $this->addElement(
+            'text',
+            'perfdata',
+            [
+                'allowEmpty'    => true,
+                'label'         => t('Performance Data'),
+                'description'   => t(
+                    'The performance data of this check result. Leave empty'
+                    . ' if this check result has no performance data'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('perfdata'));
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp(
+                    'Submit Passive Check Result',
+                    'Submit Passive Check Results',
+                    count($this->getObjects())
+                )
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = (function () use ($objects): Generator {
+            foreach ($this->filterGrantedOn('icingadb/command/process-check-result', $objects) as $object) {
+                if ($object->passive_checks_enabled) {
+                    yield $object;
+                }
+            }
+        })();
+
+        if ($granted->valid()) {
+            $command = new ProcessCheckResultCommand();
+            $command->setObjects($granted);
+            $command->setStatus($this->getValue('status'));
+            $command->setOutput($this->getValue('output'));
+            $command->setPerformanceData($this->getValue('perfdata'));
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/RemoveAcknowledgementForm.php b/application/forms/Command/Object/RemoveAcknowledgementForm.php
new file mode 100644
index 0000000..8697985
--- /dev/null
+++ b/application/forms/Command/Object/RemoveAcknowledgementForm.php
@@ -0,0 +1,77 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Icinga\Module\Icingadb\Command\Object\RemoveAcknowledgementCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class RemoveAcknowledgementForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(tp(
+                    'Removed acknowledgment successfully',
+                    'Removed acknowledgment from %d hosts successfully',
+                    $countObjects
+                ), $countObjects);
+            } else {
+                $message = sprintf(tp(
+                    'Removed acknowledgment successfully',
+                    'Removed acknowledgment from %d services successfully',
+                    $countObjects
+                ), $countObjects);
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected $defaultAttributes = ['class' => 'inline'];
+
+    protected function assembleElements()
+    {
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submitButton',
+            'btn_submit',
+            [
+                'class' => ['link-button', 'spinner'],
+                'label' => [
+                    new Icon('trash'),
+                    tp('Remove acknowledgement', 'Remove acknowledgements', count($this->getObjects()))
+                ]
+            ]
+        );
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/remove-acknowledgement', $objects);
+
+        if ($granted->valid()) {
+            $command = new RemoveAcknowledgementCommand();
+            $command->setObjects($granted);
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/ScheduleCheckForm.php b/application/forms/Command/Object/ScheduleCheckForm.php
new file mode 100644
index 0000000..9b32ea1
--- /dev/null
+++ b/application/forms/Command/Object/ScheduleCheckForm.php
@@ -0,0 +1,137 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use DateInterval;
+use DateTime;
+use Generator;
+use Icinga\Module\Icingadb\Command\Object\ScheduleCheckCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class ScheduleCheckForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(
+                    tp('Scheduled check successfully', 'Scheduled check for %d hosts successfully', $countObjects),
+                    $countObjects
+                );
+            } else {
+                $message = sprintf(
+                    tp('Scheduled check successfully', 'Scheduled check for %d services successfully', $countObjects),
+                    $countObjects
+                );
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement(
+                    'li',
+                    null,
+                    Text::create(t(
+                        'This command is used to schedule the next check of hosts or services. Icinga'
+                        . ' will re-queue the hosts or services to be checked at the time you specify.'
+                    ))
+                )
+            )
+        ));
+
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'localDateTime',
+            'check_time',
+            [
+                'data-use-datetime-picker'  => true,
+                'required'                  => true,
+                'label'                     => t('Check Time'),
+                'description'               => t('Set the date and time when the check should be scheduled.'),
+                'value'                     => (new DateTime())->add(new DateInterval('PT1H'))
+            ]
+        );
+        $decorator->decorate($this->getElement('check_time'));
+
+        $this->addElement(
+            'checkbox',
+            'force_check',
+            [
+                'label'         => t('Force Check'),
+                'description'   => t(
+                    'If you select this option, Icinga will force a check regardless of both what time the'
+                    . ' scheduled check occurs and whether or not checks are enabled.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('force_check'));
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp('Schedule check', 'Schedule checks', count($this->getObjects()))
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = (function () use ($objects): Generator {
+            foreach ($objects as $object) {
+                if (
+                    $this->isGrantedOn('icingadb/command/schedule-check', $object)
+                    || (
+                        $object->active_checks_enabled
+                        && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
+                    )
+                ) {
+                    yield $object;
+                }
+            }
+        })();
+
+        if ($granted->valid()) {
+            $command = new ScheduleCheckCommand();
+            $command->setObjects($granted);
+            $command->setForced($this->getElement('force_check')->isChecked());
+            $command->setCheckTime($this->getValue('check_time')->getTimestamp());
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/ScheduleHostDowntimeForm.php b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
new file mode 100644
index 0000000..bc21114
--- /dev/null
+++ b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
@@ -0,0 +1,119 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use DateInterval;
+use DateTime;
+use Icinga\Application\Config;
+use Icinga\Module\Icingadb\Command\Object\PropagateHostDowntimeCommand;
+use Icinga\Module\Icingadb\Command\Object\ScheduleHostDowntimeCommand;
+use Icinga\Web\Notification;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Traversable;
+
+class ScheduleHostDowntimeForm extends ScheduleServiceDowntimeForm
+{
+    /** @var bool */
+    protected $hostDowntimeAllServices;
+
+    public function __construct()
+    {
+        $this->start = new DateTime();
+        $config = Config::module('icingadb');
+        $this->commentText = $config->get('settings', 'hostdowntime_comment_text');
+
+        $this->hostDowntimeAllServices = (bool) $config->get('settings', 'hostdowntime_all_services', false);
+
+        $fixedEnd = clone $this->start;
+        $fixed = $config->get('settings', 'hostdowntime_end_fixed', 'PT1H');
+        $this->fixedEnd = $fixedEnd->add(new DateInterval($fixed));
+
+        $flexibleEnd = clone $this->start;
+        $flexible = $config->get('settings', 'hostdowntime_end_flexible', 'PT2H');
+        $this->flexibleEnd = $flexibleEnd->add(new DateInterval($flexible));
+
+        $flexibleDuration = $config->get('settings', 'hostdowntime_flexible_duration', 'PT2H');
+        $this->flexibleDuration = new DateInterval($flexibleDuration);
+
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+
+            Notification::success(sprintf(
+                tp('Scheduled downtime successfully', 'Scheduled downtime for %d hosts successfully', $countObjects),
+                $countObjects
+            ));
+        });
+    }
+
+    protected function assembleElements()
+    {
+        parent::assembleElements();
+
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'checkbox',
+            'all_services',
+            [
+                'label'         => t('All Services'),
+                'description'   => t(
+                    'Sets downtime for all services for the matched host objects. If child options are set,'
+                    . ' all child hosts and their services will schedule a downtime too.'
+                ),
+                'value'         => $this->hostDowntimeAllServices
+            ]
+        );
+        $decorator->decorate($this->getElement('all_services'));
+
+        $this->addElement(
+            'select',
+            'child_options',
+            array(
+                'description'   => t('Schedule child downtimes.'),
+                'label'         => t('Child Options'),
+                'options'       => [
+                    0 => t('Do nothing with child hosts'),
+                    1 => t('Schedule triggered downtime for all child hosts'),
+                    2 => t('Schedule non-triggered downtime for all child hosts')
+                ]
+            )
+        );
+        $decorator->decorate($this->getElement('child_options'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/downtime/schedule', $objects);
+
+        if ($granted->valid()) {
+            if (($childOptions = (int) $this->getValue('child_options'))) {
+                $command = new PropagateHostDowntimeCommand();
+                $command->setTriggered($childOptions === 1);
+            } else {
+                $command = new ScheduleHostDowntimeCommand();
+            }
+
+            $command->setObjects($granted);
+            $command->setComment($this->getValue('comment'));
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+            $command->setStart($this->getValue('start')->getTimestamp());
+            $command->setEnd($this->getValue('end')->getTimestamp());
+            $command->setForAllServices($this->getElement('all_services')->isChecked());
+
+            if ($this->getElement('flexible')->isChecked()) {
+                $command->setFixed(false);
+                $command->setDuration(
+                    $this->getValue('hours') * 3600 + $this->getValue('minutes') * 60
+                );
+            }
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/ScheduleServiceDowntimeForm.php b/application/forms/Command/Object/ScheduleServiceDowntimeForm.php
new file mode 100644
index 0000000..184a4e8
--- /dev/null
+++ b/application/forms/Command/Object/ScheduleServiceDowntimeForm.php
@@ -0,0 +1,267 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use DateInterval;
+use DateTime;
+use Icinga\Application\Config;
+use Icinga\Module\Icingadb\Command\Object\ScheduleServiceDowntimeCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Validator\CallbackValidator;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+class ScheduleServiceDowntimeForm extends CommandForm
+{
+    /** @var DateTime downtime start */
+    protected $start;
+
+    /** @var DateTime fixed downtime end */
+    protected $fixedEnd;
+
+    /**@var DateTime flexible downtime end */
+    protected $flexibleEnd;
+
+    /**  @var DateInterval flexible downtime duration */
+    protected $flexibleDuration;
+
+    /** @var mixed Comment Text */
+    protected $commentText;
+
+    /**
+     * Initialize this form
+     */
+    public function __construct()
+    {
+        $this->start = new DateTime();
+
+        $config = Config::module('icingadb');
+
+        $this->commentText = $config->get('settings', 'hostdowntime_comment_text');
+        $fixedEnd = clone $this->start;
+        $fixed = $config->get('settings', 'servicedowntime_end_fixed', 'PT1H');
+        $this->fixedEnd = $fixedEnd->add(new DateInterval($fixed));
+
+        $flexibleEnd = clone $this->start;
+        $flexible = $config->get('settings', 'servicedowntime_end_flexible', 'PT2H');
+        $this->flexibleEnd = $flexibleEnd->add(new DateInterval($flexible));
+
+        $flexibleDuration = $config->get('settings', 'servicedowntime_flexible_duration', 'PT2H');
+        $this->flexibleDuration = new DateInterval($flexibleDuration);
+
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+
+            Notification::success(sprintf(
+                tp('Scheduled downtime successfully', 'Scheduled downtime for %d services successfully', $countObjects),
+                $countObjects
+            ));
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $isFlexible = $this->getPopulatedValue('flexible') === 'y';
+
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement(
+                    'li',
+                    null,
+                    Text::create(t(
+                        'This command is used to schedule host and service downtimes. During the downtime specified'
+                        . ' by the start and end time, Icinga will not send notifications out about the hosts and'
+                        . ' services. When the scheduled downtime expires, Icinga will send out notifications for'
+                        . ' the hosts and services as it normally would.'
+                    ))
+                )
+            )
+        ));
+
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'textarea',
+            'comment',
+            [
+                'required'      => true,
+                'label'         => t('Comment'),
+                'description'   => t(
+                    'If you work with other administrators, you may find it useful to share information about'
+                    . ' the host or service that is having problems. Make sure you enter a brief description of'
+                    . ' what you are doing.'
+                ),
+                'value'         => $this->commentText
+            ]
+        );
+        $decorator->decorate($this->getElement('comment'));
+
+        $this->addElement(
+            'localDateTime',
+            'start',
+            [
+                'data-use-datetime-picker'  => true,
+                'required'                  => true,
+                'value'                     => $this->start,
+                'label'                     => t('Start Time'),
+                'description'               => t('Set the start date and time for the downtime.')
+            ]
+        );
+        $decorator->decorate($this->getElement('start'));
+
+        $this->addElement(
+            'localDateTime',
+            'end',
+            [
+                'data-use-datetime-picker'  => true,
+                'required'                  => true,
+                'label'                     => t('End Time'),
+                'description'               => t('Set the end date and time for the downtime.'),
+                'value'                     => $isFlexible ? $this->flexibleEnd : $this->fixedEnd,
+                'validators'                => [
+                    'DateTime' => ['break_chain_on_failure' => true],
+                    'Callback' => function ($value, $validator) {
+                    /** @var CallbackValidator $validator */
+
+                        if ($value <= $this->getValue('start')) {
+                            $validator->addMessage(t('The end time must be greater than the start time'));
+                            return false;
+                        }
+
+                        if ($value <= (new DateTime())) {
+                            $validator->addMessage(t('A downtime must not be in the past'));
+                            return false;
+                        }
+
+                        return true;
+                    }
+                ]
+            ]
+        );
+        $decorator->decorate($this->getElement('end'));
+
+        $this->addElement(
+            'checkbox',
+            'flexible',
+            [
+                'class'         => 'autosubmit',
+                'label'         => t('Flexible'),
+                'description'   => t(
+                    'To make this a flexible downtime, check this option. A flexible downtime starts when the host'
+                    . ' or service enters a problem state sometime between the start and end times you specified.'
+                    . ' It then lasts as long as the duration time you enter.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('flexible'));
+
+        if ($isFlexible) {
+            $hoursInput = $this->createElement(
+                'number',
+                'hours',
+                [
+                    'required'   => true,
+                    'label'      => t('Duration'),
+                    'value'      => $this->flexibleDuration->h,
+                    'min'        => 0,
+                    'validators' => [
+                        'Callback' => function ($value, $validator) {
+                            /** @var CallbackValidator $validator */
+
+                            if ($this->getValue('minutes') == 0 && $value == 0) {
+                                $validator->addMessage(t('The duration must not be zero'));
+                                return false;
+                            }
+
+                            return true;
+                        }
+                    ]
+                ]
+            );
+            $this->registerElement($hoursInput);
+            $decorator->decorate($hoursInput);
+
+            $minutesInput = $this->createElement(
+                'number',
+                'minutes',
+                [
+                    'required'  => true,
+                    'value'     => $this->flexibleDuration->m,
+                    'min'       => 0
+                ]
+            );
+            $this->registerElement($minutesInput);
+            $minutesInput->addWrapper(
+                new HtmlElement('label', null, new HtmlElement('span', null, Text::create(t('Minutes'))))
+            );
+
+            $hoursInput->getWrapper()->on(
+                IcingaFormDecorator::ON_ASSEMBLED,
+                function ($hoursInputWrapper) use ($minutesInput, $hoursInput) {
+                    $hoursInputWrapper
+                        ->insertAfter($minutesInput, $hoursInput)
+                        ->getAttributes()->add('class', 'downtime-duration');
+                }
+            );
+
+            $hoursInput->prependWrapper(
+                new HtmlElement('label', null, new HtmlElement('span', null, Text::create(t('Hours'))))
+            );
+
+            $this->add($hoursInput);
+        }
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp('Schedule downtime', 'Schedule downtimes', count($this->getObjects()))
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/downtime/schedule', $objects);
+
+        if ($granted->valid()) {
+            $command = new ScheduleServiceDowntimeCommand();
+            $command->setObjects($granted);
+            $command->setComment($this->getValue('comment'));
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+            $command->setStart($this->getValue('start')->getTimestamp());
+            $command->setEnd($this->getValue('end')->getTimestamp());
+
+            if ($this->getElement('flexible')->isChecked()) {
+                $command->setFixed(false);
+                $command->setDuration(
+                    $this->getValue('hours') * 3600 + $this->getValue('minutes') * 60
+                );
+            }
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/SendCustomNotificationForm.php b/application/forms/Command/Object/SendCustomNotificationForm.php
new file mode 100644
index 0000000..dfb1e96
--- /dev/null
+++ b/application/forms/Command/Object/SendCustomNotificationForm.php
@@ -0,0 +1,125 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Icinga\Application\Config;
+use Icinga\Module\Icingadb\Command\Object\SendCustomNotificationCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Module\Icingadb\Model\Host;
+use Icinga\Web\Notification;
+use ipl\Html\Attributes;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use ipl\Web\Widget\Icon;
+use Traversable;
+
+use function ipl\Stdlib\iterable_value_first;
+
+class SendCustomNotificationForm extends CommandForm
+{
+    public function __construct()
+    {
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            $countObjects = count($this->getObjects());
+            if (iterable_value_first($this->getObjects()) instanceof Host) {
+                $message = sprintf(tp(
+                    'Sent custom notification successfully',
+                    'Sent custom notification for %d hosts successfully',
+                    $countObjects
+                ), $countObjects);
+            } else {
+                $message = sprintf(tp(
+                    'Sent custom notification successfully',
+                    'Sent custom notification for %d services successfully',
+                    $countObjects
+                ), $countObjects);
+            }
+
+            Notification::success($message);
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $this->addHtml(new HtmlElement(
+            'div',
+            Attributes::create(['class' => 'form-description']),
+            new Icon('info-circle', ['class' => 'form-description-icon']),
+            new HtmlElement(
+                'ul',
+                null,
+                new HtmlElement(
+                    'li',
+                    null,
+                    Text::create(t('This command is used to send custom notifications about hosts or services.'))
+                )
+            )
+        ));
+
+        $config = Config::module('icingadb');
+        $decorator = new IcingaFormDecorator();
+
+        $this->addElement(
+            'textarea',
+            'comment',
+            [
+                'required'      => true,
+                'label'         => t('Comment'),
+                'description'   => t(
+                    'Enter a brief description on why you\'re sending this notification. It will be sent with it.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('comment'));
+
+        $this->addElement(
+            'checkbox',
+            'forced',
+            [
+                'label'         => t('Forced'),
+                'value'         => (bool) $config->get('settings', 'custom_notification_forced', false),
+                'description'   => t(
+                    'If you check this option, the notification is sent regardless'
+                    . ' of downtimes or whether notifications are enabled or not.'
+                )
+            ]
+        );
+        $decorator->decorate($this->getElement('forced'));
+    }
+
+    protected function assembleSubmitButton()
+    {
+        $this->addElement(
+            'submit',
+            'btn_submit',
+            [
+                'required'  => true,
+                'label'     => tp('Send custom notification', 'Send custom notifications', count($this->getObjects()))
+            ]
+        );
+
+        (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        $granted = $this->filterGrantedOn('icingadb/command/send-custom-notification', $objects);
+
+        if ($granted->valid()) {
+            $command = new SendCustomNotificationCommand();
+            $command->setObjects($granted);
+            $command->setComment($this->getValue('comment'));
+            $command->setForced($this->getElement('forced')->isChecked());
+            $command->setAuthor($this->getAuth()->getUser()->getUsername());
+
+            yield $command;
+        }
+    }
+}
diff --git a/application/forms/Command/Object/ToggleObjectFeaturesForm.php b/application/forms/Command/Object/ToggleObjectFeaturesForm.php
new file mode 100644
index 0000000..50767da
--- /dev/null
+++ b/application/forms/Command/Object/ToggleObjectFeaturesForm.php
@@ -0,0 +1,186 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Command\Object;
+
+use Icinga\Module\Icingadb\Command\Object\ToggleObjectFeatureCommand;
+use Icinga\Module\Icingadb\Forms\Command\CommandForm;
+use Icinga\Web\Notification;
+use ipl\Html\FormElement\CheckboxElement;
+use ipl\Orm\Model;
+use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Traversable;
+
+class ToggleObjectFeaturesForm extends CommandForm
+{
+    const LEAVE_UNCHANGED = 'noop';
+
+    protected $features;
+
+    protected $featureStatus;
+
+    /**
+     * ToggleFeature(s) being used to submit this form
+     *
+     * @var ToggleObjectFeatureCommand[]
+     */
+    protected $submittedFeatures = [];
+
+    public function __construct($featureStatus)
+    {
+        $this->featureStatus = $featureStatus;
+        $this->features = [
+            ToggleObjectFeatureCommand::FEATURE_ACTIVE_CHECKS => [
+                'label'         => t('Active Checks'),
+                'permission'    => 'icingadb/command/feature/object/active-checks'
+            ],
+            ToggleObjectFeatureCommand::FEATURE_PASSIVE_CHECKS => [
+                'label'         => t('Passive Checks'),
+                'permission'    => 'icingadb/command/feature/object/passive-checks'
+            ],
+            ToggleObjectFeatureCommand::FEATURE_NOTIFICATIONS => [
+                'label'         => t('Notifications'),
+                'permission'    => 'icingadb/command/feature/object/notifications'
+            ],
+            ToggleObjectFeatureCommand::FEATURE_EVENT_HANDLER => [
+                'label'         => t('Event Handler'),
+                'permission'    => 'icingadb/command/feature/object/event-handler'
+            ],
+            ToggleObjectFeatureCommand::FEATURE_FLAP_DETECTION => [
+                'label'         => t('Flap Detection'),
+                'permission'    => 'icingadb/command/feature/object/flap-detection'
+            ]
+        ];
+
+        $this->getAttributes()->add('class', 'object-features');
+
+        $this->on(self::ON_SUCCESS, function () {
+            if ($this->errorOccurred) {
+                return;
+            }
+
+            foreach ($this->submittedFeatures as $feature) {
+                $enabled = $feature->getEnabled();
+                switch ($feature->getFeature()) {
+                    case ToggleObjectFeatureCommand::FEATURE_ACTIVE_CHECKS:
+                        if ($enabled) {
+                            $message = t('Enabled active checks successfully');
+                        } else {
+                            $message = t('Disabled active checks successfully');
+                        }
+
+                        break;
+                    case ToggleObjectFeatureCommand::FEATURE_PASSIVE_CHECKS:
+                        if ($enabled) {
+                            $message = t('Enabled passive checks successfully');
+                        } else {
+                            $message = t('Disabled passive checks successfully');
+                        }
+
+                        break;
+                    case ToggleObjectFeatureCommand::FEATURE_EVENT_HANDLER:
+                        if ($enabled) {
+                            $message = t('Enabled event handler successfully');
+                        } else {
+                            $message = t('Disabled event handler checks successfully');
+                        }
+
+                        break;
+                    case ToggleObjectFeatureCommand::FEATURE_FLAP_DETECTION:
+                        if ($enabled) {
+                            $message = t('Enabled flap detection successfully');
+                        } else {
+                            $message = t('Disabled flap detection successfully');
+                        }
+
+                        break;
+                    case ToggleObjectFeatureCommand::FEATURE_NOTIFICATIONS:
+                        if ($enabled) {
+                            $message = t('Enabled notifications successfully');
+                        } else {
+                            $message = t('Disabled notifications successfully');
+                        }
+
+                        break;
+                    default:
+                        $message = t('Invalid feature option');
+                        break;
+                }
+
+                Notification::success($message);
+            }
+        });
+    }
+
+    protected function assembleElements()
+    {
+        $decorator = new IcingaFormDecorator();
+        foreach ($this->features as $feature => $spec) {
+            $options = [
+                'class'         => 'autosubmit',
+                'disabled'      => $this->featureStatus instanceof Model
+                    ? ! $this->isGrantedOn($spec['permission'], $this->featureStatus)
+                    : false,
+                'label'         => $spec['label']
+            ];
+            if ($this->featureStatus[$feature] === 2) {
+                $this->addElement(
+                    'select',
+                    $feature,
+                    $options + [
+                        'description'   => t('Multiple Values'),
+                        'options'       => [
+                            self::LEAVE_UNCHANGED => t('Leave Unchanged'),
+                            t('Disable All'),
+                            t('Enable All')
+                        ],
+                        'value'         => self::LEAVE_UNCHANGED
+                    ]
+                );
+                $decorator->decorate($this->getElement($feature));
+
+                $this->getElement($feature)
+                    ->getWrapper()
+                    ->getAttributes()
+                    ->add('class', 'indeterminate');
+            } else {
+                $options['value'] = (bool) $this->featureStatus[$feature];
+                $this->addElement('checkbox', $feature, $options);
+                $decorator->decorate($this->getElement($feature));
+            }
+        }
+    }
+
+    protected function assembleSubmitButton()
+    {
+    }
+
+    protected function getCommands(Traversable $objects): Traversable
+    {
+        foreach ($this->features as $feature => $spec) {
+            if ($this->getElement($feature) instanceof CheckboxElement) {
+                $state = $this->getElement($feature)->isChecked();
+            } else {
+                $state = $this->getElement($feature)->getValue();
+            }
+
+            if ($state === self::LEAVE_UNCHANGED || (int) $state === (int) $this->featureStatus[$feature]) {
+                continue;
+            }
+
+            $granted = $this->filterGrantedOn($spec['permission'], $objects);
+
+            if ($granted->valid()) {
+                $command = new ToggleObjectFeatureCommand();
+                $command->setObjects($granted);
+                $command->setFeature($feature);
+                $command->setEnabled((int) $state);
+
+                $this->submittedFeatures[] = $command;
+
+                yield $command;
+            }
+        }
+    }
+}
diff --git a/application/forms/DatabaseConfigForm.php b/application/forms/DatabaseConfigForm.php
new file mode 100644
index 0000000..7a6c1bd
--- /dev/null
+++ b/application/forms/DatabaseConfigForm.php
@@ -0,0 +1,33 @@
+<?php
+
+/* Icinga DB Web | (c) 2020 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms;
+
+use Icinga\Data\ResourceFactory;
+use Icinga\Forms\ConfigForm;
+
+class DatabaseConfigForm extends ConfigForm
+{
+    public function init()
+    {
+        $this->setSubmitLabel(t('Save Changes'));
+    }
+
+    public function createElements(array $formData)
+    {
+        $dbResources = ResourceFactory::getResourceConfigs('db')->keys();
+
+        $this->addElement('select', 'icingadb_resource', [
+            'description'   => t('Database resource'),
+            'label'         => t('Database'),
+            'multiOptions'  => array_merge(
+                ['' => sprintf(' - %s - ', t('Please choose'))],
+                array_combine($dbResources, $dbResources)
+            ),
+            'disable'       => [''],
+            'required'      => true,
+            'value'         => ''
+        ]);
+    }
+}
diff --git a/application/forms/Navigation/ActionForm.php b/application/forms/Navigation/ActionForm.php
new file mode 100644
index 0000000..08cba3f
--- /dev/null
+++ b/application/forms/Navigation/ActionForm.php
@@ -0,0 +1,58 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Navigation;
+
+use Icinga\Exception\ConfigurationError;
+use Icinga\Forms\Navigation\NavigationItemForm;
+use Icinga\Module\Icingadb\Common\Auth;
+
+class ActionForm extends NavigationItemForm
+{
+    use Auth;
+
+    /**
+     * The name of the restriction to which the filter should be applied
+     *
+     * @var string
+     */
+    protected $restriction;
+
+    public function createElements(array $formData)
+    {
+        parent::createElements($formData);
+
+        $this->addElement(
+            'text',
+            'filter',
+            array(
+                'allowEmpty'    => true,
+                'label'         => $this->translate('Filter'),
+                'description'   => $this->translate(
+                    'Display this action only for objects matching this filter. Leave it blank'
+                    . ' if you want this action being displayed regardless of the object'
+                )
+            )
+        );
+    }
+
+    public function isValid($formData): bool
+    {
+        if (! parent::isValid($formData)) {
+            return false;
+        }
+
+        if (($filterString = $this->getValue('filter')) !== null) {
+            try {
+                $this->parseRestriction($filterString, $this->restriction);
+            } catch (ConfigurationError $err) {
+                $this->getElement('filter')->addError($err->getMessage());
+
+                return false;
+            }
+        }
+
+        return true;
+    }
+}
diff --git a/application/forms/Navigation/IcingadbHostActionForm.php b/application/forms/Navigation/IcingadbHostActionForm.php
new file mode 100644
index 0000000..adee11d
--- /dev/null
+++ b/application/forms/Navigation/IcingadbHostActionForm.php
@@ -0,0 +1,10 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Navigation;
+
+class IcingadbHostActionForm extends ActionForm
+{
+    protected $restriction = 'icingadb/filter/hosts';
+}
diff --git a/application/forms/Navigation/IcingadbServiceActionForm.php b/application/forms/Navigation/IcingadbServiceActionForm.php
new file mode 100644
index 0000000..29d33c8
--- /dev/null
+++ b/application/forms/Navigation/IcingadbServiceActionForm.php
@@ -0,0 +1,10 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms\Navigation;
+
+class IcingadbServiceActionForm extends ActionForm
+{
+    protected $restriction = 'icingadb/filter/services';
+}
diff --git a/application/forms/RedisConfigForm.php b/application/forms/RedisConfigForm.php
new file mode 100644
index 0000000..bd3db9c
--- /dev/null
+++ b/application/forms/RedisConfigForm.php
@@ -0,0 +1,606 @@
+<?php
+
+/* Icinga DB Web | (c) 2020 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms;
+
+use Closure;
+use Exception;
+use Icinga\Application\Config;
+use Icinga\Application\Icinga;
+use Icinga\Exception\NotWritableError;
+use Icinga\File\Storage\LocalFileStorage;
+use Icinga\File\Storage\TemporaryLocalFileStorage;
+use Icinga\Forms\ConfigForm;
+use Icinga\Module\Icingadb\Common\IcingaRedis;
+use Icinga\Web\Form;
+use ipl\Validator\PrivateKeyValidator;
+use ipl\Validator\X509CertValidator;
+use Zend_Validate_Callback;
+
+class RedisConfigForm extends ConfigForm
+{
+    public function init()
+    {
+        $this->setSubmitLabel(t('Save Changes'));
+        $this->setValidatePartial(true);
+    }
+
+    public function createElements(array $formData)
+    {
+        $this->addElement('checkbox', 'redis_tls', [
+            'label'       => t('Use TLS'),
+            'description' => t('Encrypt connections to Redis via TLS'),
+            'autosubmit'  => true
+        ]);
+
+        $this->addElement('hidden', 'redis_ca');
+        $this->addElement('hidden', 'redis_cert');
+        $this->addElement('hidden', 'redis_key');
+        $this->addElement('hidden', 'clear_redis_ca', ['ignore' => true]);
+        $this->addElement('hidden', 'clear_redis_cert', ['ignore' => true]);
+        $this->addElement('hidden', 'clear_redis_key', ['ignore' => true]);
+
+        $useTls = isset($formData['redis_tls']) && $formData['redis_tls'];
+        if ($useTls) {
+            $this->addElement('textarea', 'redis_ca_pem', [
+                'label'       => t('Redis CA Certificate'),
+                'description' => sprintf(
+                    t('Verify the peer using this PEM-encoded CA certificate ("%s...")'),
+                    '-----BEGIN CERTIFICATE-----'
+                ),
+                'required'    => true,
+                'ignore'      => true,
+                'validators'  => [$this->wrapIplValidator(X509CertValidator::class, 'redis_ca_pem')]
+            ]);
+
+            $this->addElement('textarea', 'redis_cert_pem', [
+                'label'       => t('Client Certificate'),
+                'description' => sprintf(
+                    t('Authenticate using this PEM-encoded client certificate ("%s...")'),
+                    '-----BEGIN CERTIFICATE-----'
+                ),
+                'ignore'      => true,
+                'allowEmpty'  => false,
+                'validators'  => [
+                    $this->wrapIplValidator(X509CertValidator::class, 'redis_cert_pem', function ($value) {
+                        if (! $value && $this->getElement('redis_key_pem')->getValue()) {
+                            $this->getElement('redis_cert_pem')->addError(t(
+                                'Either both a client certificate and its private key or none of them must be specified'
+                            ));
+                        }
+
+                        return true;
+                    })
+                ]
+            ]);
+
+            $this->addElement('textarea', 'redis_key_pem', [
+                'label'       => t('Client Key'),
+                'description' => sprintf(
+                    t('Authenticate using this PEM-encoded private key ("%s...")'),
+                    '-----BEGIN PRIVATE KEY-----'
+                ),
+                'ignore'      => true,
+                'allowEmpty'  => false,
+                'validators'  => [
+                    $this->wrapIplValidator(PrivateKeyValidator::class, 'redis_key_pem', function ($value) {
+                        if (! $value && $this->getElement('redis_cert_pem')->getValue()) {
+                            $this->getElement('redis_key_pem')->addError(t(
+                                'Either both a client certificate and its private key or none of them must be specified'
+                            ));
+                        }
+
+                        return true;
+                    })
+                ]
+            ]);
+        }
+
+        $this->addDisplayGroup(
+            ['redis_tls', 'redis_insecure', 'redis_ca_pem', 'redis_cert_pem', 'redis_key_pem'],
+            'redis',
+            [
+                'decorators'  => [
+                    'FormElements',
+                    ['HtmlTag', ['tag' => 'div']],
+                    [
+                        'Description',
+                        ['tag' => 'span', 'class' => 'description', 'placement' => 'prepend']
+                    ],
+                    'Fieldset'
+                ],
+                'description' => t(
+                    'Secure connections. If you are running a high availability zone'
+                    . ' with two masters, the following applies to both of them.'
+                ),
+                'legend'      => t('General')
+            ]
+        );
+
+        if (isset($formData['skip_validation']) && $formData['skip_validation']) {
+            // In case another error occured and the checkbox was displayed before
+            static::addSkipValidationCheckbox($this);
+        }
+
+        if ($useTls && isset($formData['redis_insecure']) && $formData['redis_insecure']) {
+            // In case another error occured and the checkbox was displayed before
+            static::addInsecureCheckboxIfTls($this);
+        }
+
+        $this->addElement('text', 'redis1_host', [
+            'description' => t('Redis Host'),
+            'label'       => t('Redis Host'),
+            'required'    => true
+        ]);
+
+        $this->addElement('number', 'redis1_port', [
+            'description' => t('Redis Port'),
+            'label'       => t('Redis Port'),
+            'placeholder' => 6380
+        ]);
+
+        $this->addElement('password', 'redis1_password', [
+            'description'    => t('Redis Password'),
+            'label'          => t('Redis Password'),
+            'renderPassword' => true,
+            'autocomplete'   => 'new-password'
+        ]);
+
+        $this->addDisplayGroup(
+            ['redis1_host', 'redis1_port', 'redis1_password'],
+            'redis1',
+            [
+                'decorators'  => [
+                    'FormElements',
+                    ['HtmlTag', ['tag' => 'div']],
+                    [
+                        'Description',
+                        ['tag' => 'span', 'class' => 'description', 'placement' => 'prepend']
+                    ],
+                    'Fieldset'
+                ],
+                'description' => t(
+                    'Redis connection details of your Icinga host. If you are running a high'
+                    . ' availability zone with two masters, this is your configuration master.'
+                ),
+                'legend'      => t('Primary Icinga Master')
+            ]
+        );
+
+        $this->addElement('text', 'redis2_host', [
+            'description' => t('Redis Host'),
+            'label'       => t('Redis Host'),
+        ]);
+
+        $this->addElement('number', 'redis2_port', [
+            'description' => t('Redis Port'),
+            'label'       => t('Redis Port'),
+            'placeholder' => 6380
+        ]);
+
+        $this->addElement('password', 'redis2_password', [
+            'description'    => t('Redis Password'),
+            'label'          => t('Redis Password'),
+            'renderPassword' => true,
+            'autocomplete'   => 'new-password'
+        ]);
+
+        $this->addDisplayGroup(
+            ['redis2_host', 'redis2_port', 'redis2_password'],
+            'redis2',
+            [
+                'decorators'  => [
+                    'FormElements',
+                    ['HtmlTag', ['tag' => 'div']],
+                    [
+                        'Description',
+                        ['tag' => 'span', 'class' => 'description', 'placement' => 'prepend']
+                    ],
+                    'Fieldset'
+                ],
+                'description' => t(
+                    'If you are running a high availability zone with two masters,'
+                    . ' please provide the Redis connection details of the secondary master.'
+                ),
+                'legend'      => t('Secondary Icinga Master')
+            ]
+        );
+    }
+
+    public static function addSkipValidationCheckbox(Form $form)
+    {
+        $form->addElement(
+            'checkbox',
+            'skip_validation',
+            [
+                'order'         => 0,
+                'ignore'        => true,
+                'label'         => t('Skip Validation'),
+                'description'   => t(
+                    'Check this box to enforce changes without validating that Redis is available.'
+                )
+            ]
+        );
+    }
+
+    public static function addInsecureCheckboxIfTls(Form $form)
+    {
+        if ($form->getElement('redis_insecure') !== null) {
+            return;
+        }
+
+        $form->addElement(
+            'checkbox',
+            'redis_insecure',
+            [
+                'order'       => 1,
+                'label'       => t('Insecure'),
+                'description' => t('Don\'t verify the peer')
+            ]
+        );
+
+        $displayGroup = $form->getDisplayGroup('redis');
+        $elements = $displayGroup->getElements();
+        $elements['redis_insecure'] = $form->getElement('redis_insecure');
+        $displayGroup->setElements($elements);
+    }
+
+    public function isValid($formData)
+    {
+        if (! parent::isValid($formData)) {
+            return false;
+        }
+
+        if (($el = $this->getElement('skip_validation')) === null || ! $el->isChecked()) {
+            if (! static::checkRedis($this)) {
+                if ($el === null) {
+                    static::addSkipValidationCheckbox($this);
+
+                    if ($this->getElement('redis_tls')->isChecked()) {
+                        static::addInsecureCheckboxIfTls($this);
+                    }
+                }
+
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public function isValidPartial(array $formData)
+    {
+        if (! parent::isValidPartial($formData)) {
+            return false;
+        }
+
+        $useTls = $this->getElement('redis_tls')->isChecked();
+        foreach (['ca', 'cert', 'key'] as $name) {
+            $textareaName = 'redis_' . $name . '_pem';
+            $clearName = 'clear_redis_' . $name;
+
+            if ($useTls) {
+                $this->getElement($clearName)->setValue(null);
+
+                $pemPath = $this->getValue('redis_' . $name);
+                if ($pemPath && ! isset($formData[$textareaName]) && ! $formData[$clearName]) {
+                    $this->getElement($textareaName)->setValue(@file_get_contents($pemPath));
+                }
+            }
+
+            if (isset($formData[$textareaName]) && ! $formData[$textareaName]) {
+                $this->getElement($clearName)->setValue(true);
+            }
+        }
+
+        if ($this->getElement('backend_validation')->isChecked()) {
+            if (! static::checkRedis($this)) {
+                if ($this->getElement('redis_tls')->isChecked()) {
+                    static::addInsecureCheckboxIfTls($this);
+                }
+
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public function onRequest()
+    {
+        $errors = [];
+
+        $redisConfig = $this->config->getSection('redis');
+        if ($redisConfig->get('tls', false)) {
+            foreach (['ca', 'cert', 'key'] as $name) {
+                $path = $redisConfig->get($name);
+                if (file_exists($path)) {
+                    try {
+                        $redisConfig[$name . '_pem'] = file_get_contents($path);
+                    } catch (Exception $e) {
+                        $errors['redis_' . $name . '_pem'] = sprintf(
+                            t('Failed to read file "%s": %s'),
+                            $path,
+                            $e->getMessage()
+                        );
+                    }
+                }
+            }
+        }
+
+        $connectionConfig = Config::fromIni(
+            join(DIRECTORY_SEPARATOR, [dirname($this->config->getConfigFile()), 'redis.ini'])
+        );
+        $this->config->setSection('redis1', [
+            'host'      => $connectionConfig->get('redis1', 'host'),
+            'port'      => $connectionConfig->get('redis1', 'port'),
+            'password'  => $connectionConfig->get('redis1', 'password')
+        ]);
+        $this->config->setSection('redis2', [
+            'host'      => $connectionConfig->get('redis2', 'host'),
+            'port'      => $connectionConfig->get('redis2', 'port'),
+            'password'  => $connectionConfig->get('redis2', 'password')
+        ]);
+
+        parent::onRequest();
+
+        foreach ($errors as $elementName => $message) {
+            $this->getElement($elementName)->addError($message);
+        }
+    }
+
+    public function onSuccess()
+    {
+        $storage = new LocalFileStorage(Icinga::app()->getStorageDir(
+            join(DIRECTORY_SEPARATOR, ['modules', 'icingadb', 'redis'])
+        ));
+
+        $useTls = $this->getElement('redis_tls')->isChecked();
+        $pem = null;
+        foreach (['ca', 'cert', 'key'] as $name) {
+            $textarea = $this->getElement('redis_' . $name . '_pem');
+            if ($useTls && $textarea !== null && ($pem = $textarea->getValue())) {
+                $pemFile = md5($pem) . '-' . $name . '.pem';
+                if (! $storage->has($pemFile)) {
+                    try {
+                        $storage->create($pemFile, $pem);
+                    } catch (NotWritableError $e) {
+                        $textarea->addError($e->getMessage());
+                        return false;
+                    }
+                }
+
+                $this->getElement('redis_' . $name)->setValue($storage->resolvePath($pemFile));
+            }
+
+            if ((! $useTls && $this->getElement('clear_redis_' . $name)->getValue()) || ($useTls && ! $pem)) {
+                $pemPath = $this->getValue('redis_' . $name);
+                if ($pemPath && $storage->has(($pemFile = basename($pemPath)))) {
+                    try {
+                        $storage->delete($pemFile);
+                        $this->getElement('redis_' . $name)->setValue(null);
+                    } catch (NotWritableError $e) {
+                        $this->addError($e->getMessage());
+                        return false;
+                    }
+                }
+            }
+        }
+
+        $connectionConfig = Config::fromIni(
+            join(DIRECTORY_SEPARATOR, [dirname($this->config->getConfigFile()), 'redis.ini'])
+        );
+
+        $redis1Host = $this->getValue('redis1_host');
+        $redis1Port = $this->getValue('redis1_port');
+        $redis1Password = $this->getValue('redis1_password');
+        $redis1Section = $connectionConfig->getSection('redis1');
+        $redis1Section['host'] = $redis1Host;
+        $this->getElement('redis1_host')->setValue(null);
+        $connectionConfig->setSection('redis1', $redis1Section);
+        if (! empty($redis1Port)) {
+            $redis1Section['port'] = $redis1Port;
+            $this->getElement('redis1_port')->setValue(null);
+        } else {
+            $redis1Section['port'] = null;
+        }
+
+        if (! empty($redis1Password)) {
+            $redis1Section['password'] = $redis1Password;
+            $this->getElement('redis1_password')->setValue(null);
+        } else {
+            $redis1Section['password'] = null;
+        }
+
+        if (! array_filter($redis1Section->toArray())) {
+            $connectionConfig->removeSection('redis1');
+        }
+
+        $redis2Host = $this->getValue('redis2_host');
+        $redis2Port = $this->getValue('redis2_port');
+        $redis2Password = $this->getValue('redis2_password');
+        $redis2Section = $connectionConfig->getSection('redis2');
+        if (! empty($redis2Host)) {
+            $redis2Section['host'] = $redis2Host;
+            $this->getElement('redis2_host')->setValue(null);
+            $connectionConfig->setSection('redis2', $redis2Section);
+        } else {
+            $redis2Section['host'] = null;
+        }
+
+        if (! empty($redis2Port)) {
+            $redis2Section['port'] = $redis2Port;
+            $this->getElement('redis2_port')->setValue(null);
+            $connectionConfig->setSection('redis2', $redis2Section);
+        } else {
+            $redis2Section['port'] = null;
+        }
+
+        if (! empty($redis2Password)) {
+            $redis2Section['password'] = $redis2Password;
+            $this->getElement('redis2_password')->setValue(null);
+        } else {
+            $redis2Section['password'] = null;
+        }
+
+        if (! array_filter($redis2Section->toArray())) {
+            $connectionConfig->removeSection('redis2');
+        }
+
+        $connectionConfig->saveIni();
+
+        return parent::onSuccess();
+    }
+
+    public function addSubmitButton()
+    {
+        parent::addSubmitButton()
+            ->getElement('btn_submit')
+            ->setDecorators(['ViewHelper']);
+
+        $this->addElement(
+            'submit',
+            'backend_validation',
+            [
+                'ignore'                => true,
+                'label'                 => t('Validate Configuration'),
+                'data-progress-label'   => t('Validation In Progress'),
+                'decorators'            => ['ViewHelper']
+            ]
+        );
+        $this->addDisplayGroup(
+            ['btn_submit', 'backend_validation'],
+            'submit_validation',
+            [
+                'decorators' => [
+                    'FormElements',
+                    ['HtmlTag', ['tag' => 'div', 'class' => 'control-group form-controls']]
+                ]
+            ]
+        );
+
+        return $this;
+    }
+
+    public static function checkRedis(Form $form): bool
+    {
+        $sections = [];
+
+        $storage = new TemporaryLocalFileStorage();
+        foreach (ConfigForm::transformEmptyValuesToNull($form->getValues()) as $sectionAndPropertyName => $value) {
+            if ($value !== null) {
+                list($section, $property) = explode('_', $sectionAndPropertyName, 2);
+                if (in_array($property, ['ca', 'cert', 'key'])) {
+                    $storage->create("$property.pem", $value);
+                    $value = $storage->resolvePath("$property.pem");
+                }
+
+                $sections[$section][$property] = $value;
+            }
+        }
+
+        $ignoredTextAreas = [
+            'ca'    => 'redis_ca_pem',
+            'cert'  => 'redis_cert_pem',
+            'key'   => 'redis_key_pem'
+        ];
+        foreach ($ignoredTextAreas as $name => $textareaName) {
+            if (($textarea = $form->getElement($textareaName)) !== null) {
+                if (($pem = $textarea->getValue())) {
+                    if ($storage->has("$name.pem")) {
+                        $storage->update("$name.pem", $pem);
+                    } else {
+                        $storage->create("$name.pem", $pem);
+                        $sections['redis'][$name] = $storage->resolvePath("$name.pem");
+                    }
+                } elseif ($storage->has("$name.pem")) {
+                    $storage->delete("$name.pem");
+                    unset($sections['redis'][$name]);
+                }
+            }
+        }
+
+        $moduleConfig = new Config();
+        $moduleConfig->setSection('redis', $sections['redis']);
+        $redisConfig = new Config();
+        $redisConfig->setSection('redis1', $sections['redis1'] ?? []);
+        $redisConfig->setSection('redis2', $sections['redis2'] ?? []);
+
+        try {
+            $redis1 = IcingaRedis::getPrimaryRedis($moduleConfig, $redisConfig);
+        } catch (Exception $e) {
+            $form->warning(sprintf(
+                t('Failed to connect to primary Redis: %s'),
+                $e->getMessage()
+            ));
+            return false;
+        }
+
+        if (IcingaRedis::getLastIcingaHeartbeat($redis1) === null) {
+            $form->warning(t('Primary connection established but failed to verify Icinga is connected as well.'));
+            return false;
+        }
+
+        try {
+            $redis2 = IcingaRedis::getSecondaryRedis($moduleConfig, $redisConfig);
+        } catch (Exception $e) {
+            $form->warning(sprintf(t('Failed to connect to secondary Redis: %s'), $e->getMessage()));
+            return false;
+        }
+
+        if ($redis2 !== null && IcingaRedis::getLastIcingaHeartbeat($redis2) === null) {
+            $form->warning(t('Secondary connection established but failed to verify Icinga is connected as well.'));
+            return false;
+        }
+
+        $form->info(t('The configuration has been successfully validated.'));
+        return true;
+    }
+
+    /**
+     * Wraps the given IPL validator class into a callback validator
+     * for usage as the only validator of the element given by name.
+     *
+     * @param   string  $cls        IPL validator class FQN
+     * @param   string  $element    Form element name
+     * @param   Closure $additionalValidator
+     *
+     * @return  array               Callback validator
+     */
+    private function wrapIplValidator(string $cls, string $element, Closure $additionalValidator = null): array
+    {
+        return [
+            'Callback',
+            false,
+            [
+                'callback' => function ($v) use ($cls, $element, $additionalValidator) {
+                    if ($additionalValidator !== null) {
+                        if (! $additionalValidator($v)) {
+                            return false;
+                        }
+                    }
+
+                    if (! $v) {
+                        return true;
+                    }
+
+                    $validator = new $cls();
+                    $valid = $validator->isValid($v);
+
+                    if (! $valid) {
+                        /** @var Zend_Validate_Callback $callbackValidator */
+                        $callbackValidator = $this->getElement($element)->getValidator('Callback');
+
+                        $callbackValidator->setMessage(
+                            $validator->getMessages()[0],
+                            Zend_Validate_Callback::INVALID_VALUE
+                        );
+                    }
+
+                    return $valid;
+                }
+            ]
+        ];
+    }
+}
diff --git a/application/forms/SetAsBackendForm.php b/application/forms/SetAsBackendForm.php
new file mode 100644
index 0000000..2840633
--- /dev/null
+++ b/application/forms/SetAsBackendForm.php
@@ -0,0 +1,34 @@
+<?php
+
+/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Icingadb\Forms;
+
+use Icinga\Module\Icingadb\Hook\IcingadbSupportHook;
+use Icinga\Web\Session;
+use ipl\Web\Compat\CompatForm;
+
+class SetAsBackendForm extends CompatForm
+{
+    protected $defaultAttributes = [
+        'id'    => 'setAsBackendForm',
+        'class' => 'icinga-controls'
+    ];
+
+    protected function assemble()
+    {
+        $this->addElement('checkbox', 'backend', [
+            'class' => 'autosubmit',
+            'label' => t('Use Icinga DB As Backend'),
+            'value' => IcingadbSupportHook::isIcingaDbSetAsPreferredBackend()
+        ]);
+    }
+
+    public function onSuccess()
+    {
+        Session::getSession()->getNamespace('icingadb')->set(
+            IcingadbSupportHook::PREFERENCE_NAME,
+            $this->getElement('backend')->isChecked()
+        );
+    }
+}