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<?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\ExceptionEvent;
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\ExceptionEvent $event
* The exception event.
*/
public function onException(ExceptionEvent $event) {
$exception = $event->getThrowable();
// If this is not a 404, we don't need to check for a redirection.
if (!($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)) {
[$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(): array {
$events = [];
$events[KernelEvents::EXCEPTION] = ['onException'];
return $events;
}
}
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