diff core/modules/node/src/EventSubscriber/NodeTranslationExceptionSubscriber.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/node/src/EventSubscriber/NodeTranslationExceptionSubscriber.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\node\EventSubscriber;
+
+use Drupal\Core\KeyValueStore\KeyValueFactoryInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\ParamConverter\ParamNotConvertedException;
+use Drupal\Core\Routing\UrlGeneratorInterface;
+use Drupal\Core\State\StateInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Redirect node translations that have been consolidated by migration.
+ *
+ * If we migrated node translations from Drupal 6 or 7, these nodes are now
+ * combined with their source language node. Since there still might be
+ * references to the URLs of these now consolidated nodes, this service catches
+ * the 404s and try to redirect them to the right node in the right language.
+ *
+ * The mapping of the old nids to the new ones is made by the
+ * NodeTranslationMigrateSubscriber class during the migration and is stored
+ * in the "node_translation_redirect" key/value collection.
+ *
+ * @see \Drupal\node\NodeServiceProvider
+ * @see \Drupal\node\EventSubscriber\NodeTranslationMigrateSubscriber
+ */
+class NodeTranslationExceptionSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The key value factory.
+   *
+   * @var \Drupal\Core\KeyValueStore\KeyValueFactoryInterface
+   */
+  protected $keyValue;
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * The URL generator.
+   *
+   * @var \Drupal\Core\Routing\UrlGeneratorInterface
+   */
+  protected $urlGenerator;
+
+  /**
+   * The state service.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Constructs the NodeTranslationExceptionSubscriber.
+   *
+   * @param \Drupal\Core\KeyValueStore\KeyValueFactoryInterface $key_value
+   *   The key value factory.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
+   *   The URL generator.
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state service.
+   */
+  public function __construct(KeyValueFactoryInterface $key_value, LanguageManagerInterface $language_manager, UrlGeneratorInterface $url_generator, StateInterface $state) {
+    $this->keyValue = $key_value;
+    $this->languageManager = $language_manager;
+    $this->urlGenerator = $url_generator;
+    $this->state = $state;
+  }
+
+  /**
+   * Redirects not found node translations using the key value collection.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+   *   The exception event.
+   */
+  public function onException(GetResponseForExceptionEvent $event) {
+    $exception = $event->getException();
+
+    // If this is not a 404, we don't need to check for a redirection.
+    if (!($exception instanceof NotFoundHttpException)) {
+      return;
+    }
+
+    $previous_exception = $exception->getPrevious();
+    if ($previous_exception instanceof ParamNotConvertedException) {
+      $route_name = $previous_exception->getRouteName();
+      $parameters = $previous_exception->getRawParameters();
+      if ($route_name === 'entity.node.canonical' && isset($parameters['node'])) {
+        // If the node_translation_redirect state is not set, we don't need to check
+        // for a redirection.
+        if (!$this->state->get('node_translation_redirect')) {
+          return;
+        }
+        $old_nid = $parameters['node'];
+        $collection = $this->keyValue->get('node_translation_redirect');
+        if ($old_nid && $value = $collection->get($old_nid)) {
+          list($nid, $langcode) = $value;
+          $language = $this->languageManager->getLanguage($langcode);
+          $url = $this->urlGenerator->generateFromRoute('entity.node.canonical', ['node' => $nid], ['language' => $language]);
+          $response = new RedirectResponse($url, 301);
+          $event->setResponse($response);
+        }
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events = [];
+
+    $events[KernelEvents::EXCEPTION] = ['onException'];
+
+    return $events;
+  }
+
+}