Adding upstream version 2.4.0.upstream/2.4.0upstream

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

10 files changed, 982 insertions, 0 deletions

diff --git a/library/Businessprocess/Web/Form/BpConfigBaseForm.php b/library/Businessprocess/Web/Form/BpConfigBaseForm.php
new file mode 100644
index 0000000..ddfc851
--- /dev/null
+++ b/library/Businessprocess/Web/Form/BpConfigBaseForm.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form;
+
+use Icinga\Application\Config;
+use Icinga\Application\Icinga;
+use Icinga\Authentication\Auth;
+use Icinga\Module\Businessprocess\Storage\LegacyStorage;
+use Icinga\Module\Businessprocess\BpConfig;
+
+abstract class BpConfigBaseForm extends QuickForm
+{
+    /** @var LegacyStorage */
+    protected $storage;
+
+    /** @var BpConfig */
+    protected $config;
+
+    protected function listAvailableBackends()
+    {
+        $keys = [];
+        $moduleManager = Icinga::app()->getModuleManager();
+        if ($moduleManager->hasEnabled('monitoring')) {
+            $keys = array_keys(Config::module('monitoring', 'backends')->toArray());
+            $keys = array_combine($keys, $keys);
+        }
+
+        return $keys;
+    }
+
+    public function setStorage(LegacyStorage $storage)
+    {
+        $this->storage = $storage;
+        return $this;
+    }
+
+    public function setProcessConfig(BpConfig $config)
+    {
+        $this->config = $config;
+        return $this;
+    }
+
+    protected function prepareMetadata(BpConfig $config)
+    {
+        $meta = $config->getMetadata();
+        $auth = Auth::getInstance();
+        $meta->set('Owner', $auth->getUser()->getUsername());
+
+        if ($auth->hasPermission('businessprocess/showall')) {
+            return true;
+        }
+
+        $prefixes = $auth->getRestrictions('businessprocess/prefix');
+        if (! empty($prefixes) && ! $meta->nameIsPrefixedWithOneOf($prefixes)) {
+            if (count($prefixes) === 1) {
+                $this->getElement('name')->addError(sprintf(
+                    $this->translate('Please prefix the name with "%s"'),
+                    current($prefixes)
+                ));
+            } else {
+                $this->getElement('name')->addError(sprintf(
+                    $this->translate('Please prefix the name with one of "%s"'),
+                    implode('", "', $prefixes)
+                ));
+            }
+
+            return false;
+        }
+
+        return true;
+    }
+}
diff --git a/library/Businessprocess/Web/Form/CsrfToken.php b/library/Businessprocess/Web/Form/CsrfToken.php
new file mode 100644
index 0000000..9eb24ef
--- /dev/null
+++ b/library/Businessprocess/Web/Form/CsrfToken.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form;
+
+class CsrfToken
+{
+    /**
+     * Check whether the given token is valid
+     *
+     * @param string $token Token
+     *
+     * @return bool
+     */
+    public static function isValid($token)
+    {
+        if (strpos($token, '|') === false) {
+            return false;
+        }
+
+        list($seed, $token) = explode('|', $token);
+
+        if (!is_numeric($seed)) {
+            return false;
+        }
+
+        return $token === hash('sha256', self::getSessionId() . $seed);
+    }
+
+    /**
+     * Create a new token
+     *
+     * @return string
+     */
+    public static function generate()
+    {
+        $seed = mt_rand();
+        $token = hash('sha256', self::getSessionId() . $seed);
+
+        return sprintf('%s|%s', $seed, $token);
+    }
+
+    /**
+     * Get current session id
+     *
+     * TODO: we should do this through our App or Session object
+     *
+     * @return string
+     */
+    protected static function getSessionId()
+    {
+        return session_id();
+    }
+}
diff --git a/library/Businessprocess/Web/Form/Element/Checkbox.php b/library/Businessprocess/Web/Form/Element/Checkbox.php
new file mode 100644
index 0000000..7975b82
--- /dev/null
+++ b/library/Businessprocess/Web/Form/Element/Checkbox.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Element;
+
+class Checkbox extends \Icinga\Web\Form\Element\Checkbox
+{
+
+}
diff --git a/library/Businessprocess/Web/Form/Element/FormElement.php b/library/Businessprocess/Web/Form/Element/FormElement.php
new file mode 100644
index 0000000..7647a5e
--- /dev/null
+++ b/library/Businessprocess/Web/Form/Element/FormElement.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Element;
+
+use Zend_Form_Element_Xhtml;
+
+class FormElement extends Zend_Form_Element_Xhtml
+{
+}
diff --git a/library/Businessprocess/Web/Form/Element/SimpleNote.php b/library/Businessprocess/Web/Form/Element/SimpleNote.php
new file mode 100644
index 0000000..9f757f2
--- /dev/null
+++ b/library/Businessprocess/Web/Form/Element/SimpleNote.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Element;
+
+class SimpleNote extends FormElement
+{
+    public $helper = 'formSimpleNote';
+
+    /**
+     * Always ignore this element
+     * @codingStandardsIgnoreStart
+     *
+     * @var boolean
+     */
+    protected $_ignore = true;
+    // @codingStandardsIgnoreEnd
+    
+    public function isValid($value, $context = null)
+    {
+        return true;
+    }
+}
diff --git a/library/Businessprocess/Web/Form/Element/StateOverrides.php b/library/Businessprocess/Web/Form/Element/StateOverrides.php
new file mode 100644
index 0000000..c2216c0
--- /dev/null
+++ b/library/Businessprocess/Web/Form/Element/StateOverrides.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Element;
+
+class StateOverrides extends FormElement
+{
+    public $helper = 'formStateOverrides';
+
+    /** @var array The overridable states */
+    protected $states;
+
+    /**
+     * Set the overridable states
+     *
+     * @param array $states
+     *
+     * @return $this
+     */
+    public function setStates(array $states)
+    {
+        $this->states = $states;
+
+        return $this;
+    }
+
+    /**
+     * Get the overridable states
+     *
+     * @return array
+     */
+    public function getStates()
+    {
+        return $this->states;
+    }
+
+    public function init()
+    {
+        $this->setIsArray(true);
+    }
+
+    public function setValue($value)
+    {
+        $cleanedValue = [];
+
+        if (! empty($value)) {
+            foreach ($value as $from => $to) {
+                if ((int) $from !== (int) $to) {
+                    $cleanedValue[$from] = $to;
+                }
+            }
+        }
+
+        return parent::setValue($cleanedValue);
+    }
+}
diff --git a/library/Businessprocess/Web/Form/FormLoader.php b/library/Businessprocess/Web/Form/FormLoader.php
new file mode 100644
index 0000000..965da4b
--- /dev/null
+++ b/library/Businessprocess/Web/Form/FormLoader.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form;
+
+use Icinga\Application\Icinga;
+use Icinga\Application\Modules\Module;
+use Icinga\Exception\ProgrammingError;
+
+class FormLoader
+{
+    public static function load($name, Module $module = null)
+    {
+        if ($module === null) {
+            $basedir = Icinga::app()->getApplicationDir('forms');
+            $ns = '\\Icinga\\Web\\Forms\\';
+        } else {
+            $basedir = $module->getFormDir();
+            $ns = '\\Icinga\\Module\\' . ucfirst($module->getName()) . '\\Forms\\';
+        }
+        if (preg_match('~^[a-z0-9/]+$~i', $name)) {
+            $parts = preg_split('~/~', $name);
+            $class = ucfirst(array_pop($parts)) . 'Form';
+            $file = sprintf('%s/%s/%s.php', rtrim($basedir, '/'), implode('/', $parts), $class);
+            if (file_exists($file)) {
+                require_once($file);
+                $class = $ns . $class;
+                $options = array();
+                if ($module !== null) {
+                    $options['icingaModule'] = $module;
+                }
+
+                return new $class($options);
+            }
+        }
+        throw new ProgrammingError(sprintf('Cannot load %s (%s), no such form', $name, $file));
+    }
+}
diff --git a/library/Businessprocess/Web/Form/QuickBaseForm.php b/library/Businessprocess/Web/Form/QuickBaseForm.php
new file mode 100644
index 0000000..3ef7b66
--- /dev/null
+++ b/library/Businessprocess/Web/Form/QuickBaseForm.php
@@ -0,0 +1,167 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form;
+
+use Icinga\Application\Icinga;
+use Icinga\Application\Modules\Module;
+use ipl\Html\ValidHtml;
+use Zend_Form;
+
+abstract class QuickBaseForm extends Zend_Form implements ValidHtml
+{
+    /**
+     * The Icinga module this form belongs to. Usually only set if the
+     * form is initialized through the FormLoader
+     *
+     * @var Module
+     */
+    protected $icingaModule;
+
+    protected $icingaModuleName;
+
+    private $hintCount = 0;
+
+    public function __construct($options = null)
+    {
+        $this->callZfConstructor($this->handleOptions($options))
+            ->initializePrefixPaths();
+    }
+
+    protected function callZfConstructor($options = null)
+    {
+        parent::__construct($options);
+        return $this;
+    }
+
+    protected function initializePrefixPaths()
+    {
+        $this->addPrefixPathsForBusinessprocess();
+        if ($this->icingaModule && $this->icingaModuleName !== 'businessprocess') {
+            $this->addPrefixPathsForModule($this->icingaModule);
+        }
+    }
+
+    protected function addPrefixPathsForBusinessprocess()
+    {
+        $module = Icinga::app()
+            ->getModuleManager()
+            ->loadModule('businessprocess')
+            ->getModule('businessprocess');
+
+        $this->addPrefixPathsForModule($module);
+    }
+
+    public function addPrefixPathsForModule(Module $module)
+    {
+        $basedir = sprintf(
+            '%s/%s/Web/Form',
+            $module->getLibDir(),
+            ucfirst($module->getName())
+        );
+
+        $this->addPrefixPaths(array(
+            array(
+                'prefix'    => __NAMESPACE__ . '\\Element\\',
+                'path'      => $basedir . '/Element',
+                'type'      => static::ELEMENT
+            )
+        ));
+
+        return $this;
+    }
+
+    public function addHidden($name, $value = null)
+    {
+        $this->addElement('hidden', $name);
+        $el = $this->getElement($name);
+        $el->setDecorators(array('ViewHelper'));
+        if ($value !== null) {
+            $this->setDefault($name, $value);
+            $el->setValue($value);
+        }
+    
+        return $this;
+    }
+
+    // TODO: Should be an element
+    public function addHtmlHint($html, $options = array())
+    {
+        return $this->addHtml('<div class="hint">' . $html . '</div>', $options);
+    }
+
+    public function addHtml($html, $options = array())
+    {
+        if (array_key_exists('name', $options)) {
+            $name = $options['name'];
+            unset($options['name']);
+        } else {
+            $name = '_HINT' . ++$this->hintCount;
+        }
+
+        $this->addElement('simpleNote', $name, $options);
+        $this->getElement($name)
+            ->setValue($html)
+            ->setIgnore(true)
+            ->setDecorators(array('ViewHelper'));
+
+        return $this;
+    }
+
+    public function optionalEnum($enum, $nullLabel = null)
+    {
+        if ($nullLabel === null) {
+            $nullLabel = $this->translate('- please choose -');
+        }
+
+        return array(null => $nullLabel) + $enum;
+    }
+
+    protected function handleOptions($options = null)
+    {
+        if ($options === null) {
+            return $options;
+        }
+
+        if (array_key_exists('icingaModule', $options)) {
+            /** @var Module icingaModule */
+            $this->icingaModule = $options['icingaModule'];
+            $this->icingaModuleName = $this->icingaModule->getName();
+            unset($options['icingaModule']);
+        }
+
+        return $options;
+    }
+
+    public function setIcingaModule(Module $module)
+    {
+        $this->icingaModule = $module;
+        return $this;
+    }
+
+    protected function loadForm($name, Module $module = null)
+    {
+        if ($module === null) {
+            $module = $this->icingaModule;
+        }
+
+        return FormLoader::load($name, $module);
+    }
+
+    protected function valueIsEmpty($value)
+    {
+        if (is_array($value)) {
+            return empty($value);
+        }
+
+        return strlen($value) === 0;
+    }
+
+    public function translate($string)
+    {
+        if ($this->icingaModuleName === null) {
+            return t($string);
+        } else {
+            return mt($this->icingaModuleName, $string);
+        }
+    }
+}
diff --git a/library/Businessprocess/Web/Form/QuickForm.php b/library/Businessprocess/Web/Form/QuickForm.php
new file mode 100644
index 0000000..c39b34b
--- /dev/null
+++ b/library/Businessprocess/Web/Form/QuickForm.php
@@ -0,0 +1,502 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form;
+
+use Icinga\Application\Icinga;
+use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Notification;
+use Icinga\Web\Request;
+use Icinga\Web\Response;
+use Icinga\Web\Url;
+use Exception;
+
+/**
+ * QuickForm wants to be a base class for simple forms
+ */
+abstract class QuickForm extends QuickBaseForm
+{
+    const ID = '__FORM_NAME';
+
+    const CSRF = '__FORM_CSRF';
+
+    /**
+     * The name of this form
+     */
+    protected $formName;
+
+    /**
+     * Whether the form has been sent
+     */
+    protected $hasBeenSent;
+
+    /**
+     * Whether the form has been sent
+     */
+    protected $hasBeenSubmitted;
+
+    /**
+     * The submit caption, element - still tbd
+     */
+    // protected $submit;
+
+    /**
+     * Our request
+     */
+    protected $request;
+
+    /**
+     * @var Url
+     */
+    protected $successUrl;
+
+    protected $successMessage;
+
+    protected $submitLabel;
+
+    protected $submitButtonName;
+
+    protected $deleteButtonName;
+
+    protected $fakeSubmitButtonName;
+
+    /**
+     * Whether form elements have already been created
+     */
+    protected $didSetup = false;
+
+    protected $isApiRequest = false;
+
+    public function __construct($options = null)
+    {
+        parent::__construct($options);
+
+        $this->setMethod('post');
+        $this->getActionFromRequest()
+            ->createIdElement()
+            ->regenerateCsrfToken()
+            ->setPreferredDecorators();
+    }
+
+    protected function getActionFromRequest()
+    {
+        $this->setAction(Url::fromRequest());
+        return $this;
+    }
+
+    protected function setPreferredDecorators()
+    {
+        $this->setAttrib('class', 'autofocus icinga-controls');
+        $this->setDecorators(
+            array(
+                'Description',
+                array('FormErrors', array('onlyCustomFormErrors' => true)),
+                'FormElements',
+                'Form'
+            )
+        );
+
+        return $this;
+    }
+
+    protected function addSubmitButtonIfSet()
+    {
+        if (false === ($label = $this->getSubmitLabel())) {
+            return;
+        }
+
+        if ($this->submitButtonName && $el = $this->getElement($this->submitButtonName)) {
+            return;
+        }
+
+        $el = $this->createElement('submit', $label)
+            ->setLabel($label)
+            ->setDecorators(array('ViewHelper'));
+        $this->submitButtonName = $el->getName();
+        $this->addElement($el);
+
+        $fakeEl = $this->createElement('submit', '_FAKE_SUBMIT')
+            ->setLabel($label)
+            ->setDecorators(array('ViewHelper'));
+        $this->fakeSubmitButtonName = $fakeEl->getName();
+        $this->addElement($fakeEl);
+
+        $this->addDisplayGroup(
+            array($this->fakeSubmitButtonName),
+            'fake_button',
+            array(
+                'decorators' => array('FormElements'),
+                'order' => 1,
+            )
+        );
+
+        $grp = array(
+            $this->submitButtonName,
+            $this->deleteButtonName
+        );
+        $this->addDisplayGroup($grp, 'buttons', array(
+            'decorators' => array(
+                'FormElements',
+                array('HtmlTag', array('tag' => 'dl')),
+                'DtDdWrapper',
+            ),
+            'order' => 1000,
+        ));
+    }
+
+    protected function addSimpleDisplayGroup($elements, $name, $options)
+    {
+        if (! array_key_exists('decorators', $options)) {
+            $options['decorators'] = array(
+                'FormElements',
+                array('HtmlTag', array('tag' => 'dl')),
+                'Fieldset',
+            );
+        }
+
+        return $this->addDisplayGroup($elements, $name, $options);
+    }
+
+    protected function createIdElement()
+    {
+        $this->detectName();
+        $this->addHidden(self::ID, $this->getName());
+        $this->getElement(self::ID)->setIgnore(true);
+        return $this;
+    }
+
+    public function getSentValue($name, $default = null)
+    {
+        $request = $this->getRequest();
+        if ($request->isPost() && $this->hasBeenSent()) {
+            return $request->getPost($name);
+        } else {
+            return $default;
+        }
+    }
+
+    public function getSubmitLabel()
+    {
+        if ($this->submitLabel === null) {
+            return $this->translate('Submit');
+        }
+
+        return $this->submitLabel;
+    }
+
+    public function setSubmitLabel($label)
+    {
+        $this->submitLabel = $label;
+        return $this;
+    }
+
+    public function setApiRequest($isApiRequest = true)
+    {
+        $this->isApiRequest = $isApiRequest;
+        return $this;
+    }
+
+    public function isApiRequest()
+    {
+        return $this->isApiRequest;
+    }
+
+    public function regenerateCsrfToken()
+    {
+        if (! $element = $this->getElement(self::CSRF)) {
+            $this->addHidden(self::CSRF, CsrfToken::generate());
+            $element = $this->getElement(self::CSRF);
+        }
+        $element->setIgnore(true);
+
+        return $this;
+    }
+
+    public function removeCsrfToken()
+    {
+        $this->removeElement(self::CSRF);
+        return $this;
+    }
+
+    public function setSuccessUrl($url, $params = null)
+    {
+        if (! $url instanceof Url) {
+            $url = Url::fromPath($url);
+        }
+        if ($params !== null) {
+            $url->setParams($params);
+        }
+        $this->successUrl = $url;
+        return $this;
+    }
+
+    public function getSuccessUrl()
+    {
+        $url = $this->successUrl ?: $this->getAction();
+        if (! $url instanceof Url) {
+            $url = Url::fromPath($url);
+        }
+
+        return $url;
+    }
+
+    protected function beforeSetup()
+    {
+    }
+
+    public function setup()
+    {
+    }
+
+    protected function onSetup()
+    {
+    }
+
+    public function setAction($action)
+    {
+        if ($action instanceof Url) {
+            $action = $action->getAbsoluteUrl('&');
+        }
+
+        return parent::setAction($action);
+    }
+
+    public function hasBeenSubmitted()
+    {
+        if ($this->hasBeenSubmitted === null) {
+            $req = $this->getRequest();
+            if ($req->isPost()) {
+                if (! $this->hasSubmitButton()) {
+                    return $this->hasBeenSubmitted = $this->hasBeenSent();
+                }
+
+                $this->hasBeenSubmitted = $this->pressedButton(
+                    $this->fakeSubmitButtonName,
+                    $this->getSubmitLabel()
+                ) || $this->pressedButton(
+                    $this->submitButtonName,
+                    $this->getSubmitLabel()
+                );
+            } else {
+                $this->hasBeenSubmitted = false;
+            }
+        }
+
+        return $this->hasBeenSubmitted;
+    }
+
+    protected function hasSubmitButton()
+    {
+        return $this->submitButtonName !== null;
+    }
+
+    protected function pressedButton($name, $label)
+    {
+        $req = $this->getRequest();
+        if (! $req->isPost()) {
+            return false;
+        }
+
+        $req = $this->getRequest();
+        $post = $req->getPost();
+
+        return array_key_exists($name, $post)
+            && $post[$name] === $label;
+    }
+
+    protected function beforeValidation($data = array())
+    {
+    }
+
+    public function prepareElements()
+    {
+        if (! $this->didSetup) {
+            $this->beforeSetup();
+            $this->setup();
+            $this->addSubmitButtonIfSet();
+            $this->onSetup();
+            $this->didSetup = true;
+        }
+
+        return $this;
+    }
+
+    public function handleRequest(Request $request = null)
+    {
+        if ($request === null) {
+            $request = $this->getRequest();
+        } else {
+            $this->setRequest($request);
+        }
+
+        $this->prepareElements();
+
+        if ($this->hasBeenSent()) {
+            $post = $request->getPost();
+            if ($this->hasBeenSubmitted()) {
+                $this->beforeValidation($post);
+                if ($this->isValid($post)) {
+                    try {
+                        $this->onSuccess();
+                    } catch (Exception $e) {
+                        $this->addException($e);
+                        $this->onFailure();
+                    }
+                } else {
+                    $this->onFailure();
+                }
+            } else {
+                $this->setDefaults($post);
+            }
+        } else {
+            // Well...
+        }
+
+        return $this;
+    }
+
+    public function addException(Exception $e, $elementName = null)
+    {
+        $file = preg_split('/[\/\\\]/', $e->getFile(), -1, PREG_SPLIT_NO_EMPTY);
+        $file = array_pop($file);
+        $msg = sprintf(
+            '%s (%s:%d)',
+            $e->getMessage(),
+            $file,
+            $e->getLine()
+        );
+
+        if ($el = $this->getElement($elementName)) {
+            $el->addError($msg);
+        } else {
+            $this->addError($msg);
+        }
+    }
+
+    public function onSuccess()
+    {
+        $this->redirectOnSuccess();
+    }
+
+    public function setSuccessMessage($message)
+    {
+        $this->successMessage = $message;
+        return $this;
+    }
+
+    public function getSuccessMessage($message = null)
+    {
+        if ($message !== null) {
+            return $message;
+        }
+        if ($this->successMessage === null) {
+            return t('Form has successfully been sent');
+        }
+        return $this->successMessage;
+    }
+
+    public function redirectOnSuccess($message = null)
+    {
+        if ($this->isApiRequest()) {
+            // TODO: Set the status line message?
+            $this->successMessage = $this->getSuccessMessage($message);
+            return;
+        }
+
+        $url = $this->getSuccessUrl();
+        $this->notifySuccess($this->getSuccessMessage($message));
+        $this->redirectAndExit($url);
+    }
+
+    public function onFailure()
+    {
+    }
+
+    public function notifySuccess($message = null)
+    {
+        if ($message === null) {
+            $message = t('Form has successfully been sent');
+        }
+        Notification::success($message);
+        return $this;
+    }
+
+    public function notifyError($message)
+    {
+        Notification::error($message);
+        return $this;
+    }
+
+    protected function redirectAndExit($url)
+    {
+        /** @var Response $response */
+        $response = Icinga::app()->getFrontController()->getResponse();
+        $response->redirectAndExit($url);
+    }
+
+    protected function setHttpResponseCode($code)
+    {
+        Icinga::app()->getFrontController()->getResponse()->setHttpResponseCode($code);
+        return $this;
+    }
+
+    protected function onRequest()
+    {
+    }
+
+    public function setRequest(Request $request)
+    {
+        if ($this->request !== null) {
+            throw new ProgrammingError('Unable to set request twice');
+        }
+
+        $this->request = $request;
+        $this->prepareElements();
+        $this->onRequest();
+        return $this;
+    }
+
+    /**
+     * @return Request
+     */
+    public function getRequest()
+    {
+        if ($this->request === null) {
+            /** @var Request $request */
+            $request = Icinga::app()->getFrontController()->getRequest();
+            $this->setRequest($request);
+        }
+        return $this->request;
+    }
+
+    public function hasBeenSent()
+    {
+        if ($this->hasBeenSent === null) {
+
+            /** @var Request $req */
+            if ($this->request === null) {
+                $req = Icinga::app()->getFrontController()->getRequest();
+            } else {
+                $req = $this->request;
+            }
+
+            if ($req->isPost()) {
+                $post = $req->getPost();
+                $this->hasBeenSent = array_key_exists(self::ID, $post) &&
+                    $post[self::ID] === $this->getName();
+            } else {
+                $this->hasBeenSent = false;
+            }
+        }
+
+        return $this->hasBeenSent;
+    }
+
+    protected function detectName()
+    {
+        if ($this->formName !== null) {
+            $this->setName($this->formName);
+        } else {
+            $this->setName(get_class($this));
+        }
+    }
+}
diff --git a/library/Businessprocess/Web/Form/Validator/NoDuplicateChildrenValidator.php b/library/Businessprocess/Web/Form/Validator/NoDuplicateChildrenValidator.php
new file mode 100644
index 0000000..9676de0
--- /dev/null
+++ b/library/Businessprocess/Web/Form/Validator/NoDuplicateChildrenValidator.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Icinga\Module\Businessprocess\Web\Form\Validator;
+
+use Icinga\Module\Businessprocess\BpConfig;
+use Icinga\Module\Businessprocess\BpNode;
+use Icinga\Module\Businessprocess\Forms\EditNodeForm;
+use Icinga\Module\Businessprocess\Web\Form\QuickForm;
+use Zend_Validate_Abstract;
+
+class NoDuplicateChildrenValidator extends Zend_Validate_Abstract
+{
+    const CHILD_FOUND = 'childFound';
+
+    /** @var QuickForm */
+    protected $form;
+
+    /** @var BpConfig */
+    protected $bp;
+
+    /** @var BpNode */
+    protected $parent;
+
+    /** @var string */
+    protected $label;
+
+    public function __construct(QuickForm $form, BpConfig $bp, BpNode $parent = null)
+    {
+        $this->form = $form;
+        $this->bp = $bp;
+        $this->parent = $parent;
+
+        $this->_messageVariables['label'] = 'label';
+        $this->_messageTemplates = [
+            self::CHILD_FOUND => mt('businessprocess', '%label% is already defined in this process')
+        ];
+    }
+
+    public function isValid($value)
+    {
+        if ($this->parent === null) {
+            $found = $this->bp->hasRootNode($value);
+        } elseif ($this->form instanceof EditNodeForm && $this->form->getNode()->getName() === $value) {
+            $found = false;
+        } else {
+            $found = $this->parent->hasChild($value);
+        }
+
+        if (! $found) {
+            return true;
+        }
+
+        $this->label = $this->form->getElement('children')->getMultiOptions()[$value];
+        $this->_error(self::CHILD_FOUND);
+        return false;
+    }
+}