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class Fast404ExceptionHtmlSubscriber in Zircon Profile 8

Same name and namespace in other branches
  1. 8.0 core/lib/Drupal/Core/EventSubscriber/Fast404ExceptionHtmlSubscriber.php \Drupal\Core\EventSubscriber\Fast404ExceptionHtmlSubscriber

High-performance 404 exception subscriber.

This subscriber will return a minimalist 404 response for HTML requests without running a full page theming operation.

Hierarchy

Expanded class hierarchy of Fast404ExceptionHtmlSubscriber

1 string reference to 'Fast404ExceptionHtmlSubscriber'
core.services.yml in core/core.services.yml
core/core.services.yml
1 service uses Fast404ExceptionHtmlSubscriber
exception.fast_404_html in core/core.services.yml
Drupal\Core\EventSubscriber\Fast404ExceptionHtmlSubscriber

File

core/lib/Drupal/Core/EventSubscriber/Fast404ExceptionHtmlSubscriber.php, line 22
Contains \Drupal\Core\EventSubscriber\Fast404ExceptionHtmlSubscriber.

Namespace

Drupal\Core\EventSubscriber
View source
class Fast404ExceptionHtmlSubscriber extends HttpExceptionSubscriberBase {

  /**
   * The HTTP kernel.
   *
   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
   */
  protected $httpKernel;

  /**
   * The config factory.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $configFactory;

  /**
   * Constructs a new Fast404ExceptionHtmlSubscriber.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The configuration factory.
   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
   *   The HTTP Kernel service.
   */
  public function __construct(ConfigFactoryInterface $config_factory, HttpKernelInterface $http_kernel) {
    $this->configFactory = $config_factory;
    $this->httpKernel = $http_kernel;
  }

  /**
   * {@inheritdoc}
   */
  protected static function getPriority() {

    // A very high priority so that it can take precedent over anything else,
    // and thus be fast.
    return 200;
  }

  /**
   * {@inheritDoc}
   */
  protected function getHandledFormats() {
    return [
      'html',
    ];
  }

  /**
   * Handles a 404 error for HTML.
   *
   * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
   *   The event to process.
   */
  public function on404(GetResponseForExceptionEvent $event) {
    $request = $event
      ->getRequest();
    $config = $this->configFactory
      ->get('system.performance');
    $exclude_paths = $config
      ->get('fast_404.exclude_paths');
    if ($config
      ->get('fast_404.enabled') && $exclude_paths && !preg_match($exclude_paths, $request
      ->getPathInfo())) {
      $fast_paths = $config
        ->get('fast_404.paths');
      if ($fast_paths && preg_match($fast_paths, $request
        ->getPathInfo())) {
        $fast_404_html = strtr($config
          ->get('fast_404.html'), [
          '@path' => Html::escape($request
            ->getUri()),
        ]);
        $response = new Response($fast_404_html, Response::HTTP_NOT_FOUND);
        $event
          ->setResponse($response);
      }
    }
  }

}

Members

Namesort descending Modifiers Type Description Overrides
Fast404ExceptionHtmlSubscriber::$configFactory protected property The config factory.
Fast404ExceptionHtmlSubscriber::$httpKernel protected property The HTTP kernel.
Fast404ExceptionHtmlSubscriber::getHandledFormats protected function Specifies the request formats this subscriber will respond to. Overrides HttpExceptionSubscriberBase::getHandledFormats
Fast404ExceptionHtmlSubscriber::getPriority protected static function Specifies the priority of all listeners in this class. Overrides HttpExceptionSubscriberBase::getPriority
Fast404ExceptionHtmlSubscriber::on404 public function Handles a 404 error for HTML.
Fast404ExceptionHtmlSubscriber::__construct public function Constructs a new Fast404ExceptionHtmlSubscriber.
HttpExceptionSubscriberBase::getSubscribedEvents public static function Registers the methods in this class that should be listeners. Overrides EventSubscriberInterface::getSubscribedEvents
HttpExceptionSubscriberBase::onException public function Handles errors for this subscriber.