class OptionsRequestSubscriber in Drupal 8

Handles options requests.

Therefore it sends a options response using all methods on all possible routes.

Hierarchy

• class \Drupal\Core\EventSubscriber\OptionsRequestSubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 file declares its use of OptionsRequestSubscriber

OptionsRequestSubscriberTest.php in core/tests/Drupal/Tests/Core/EventSubscriber/OptionsRequestSubscriberTest.php

1 string reference to 'OptionsRequestSubscriber'

core.services.yml in core/core.services.yml

core/core.services.yml

1 service uses OptionsRequestSubscriber

options_request_listener in core/core.services.yml

Drupal\Core\EventSubscriber\OptionsRequestSubscriber

File

core/lib/Drupal/Core/EventSubscriber/OptionsRequestSubscriber.php, line 18

Namespace

Drupal\Core\EventSubscriber

class OptionsRequestSubscriber implements EventSubscriberInterface {

  /**
   * The route provider.
   *
   * @var \Symfony\Cmf\Component\Routing\RouteProviderInterface
   */
  protected $routeProvider;

  /**
   * Creates a new OptionsRequestSubscriber instance.
   *
   * @param \Symfony\Cmf\Component\Routing\RouteProviderInterface $route_provider
   *   The route provider.
   */
  public function __construct(RouteProviderInterface $route_provider) {
    $this->routeProvider = $route_provider;
  }

  /**
   * Tries to handle the options request.
   *
   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
   *   The request event.
   */
  public function onRequest(GetResponseEvent $event) {
    if ($event
      ->getRequest()
      ->isMethod('OPTIONS')) {
      $routes = $this->routeProvider
        ->getRouteCollectionForRequest($event
        ->getRequest());

      // In case we don't have any routes, a 403 should be thrown by the normal
      // request handling.
      if (count($routes) > 0) {

        // Flatten and unique the available methods.
        $methods = array_reduce($routes
          ->all(), function ($methods, Route $route) {
          return array_merge($methods, $route
            ->getMethods());
        }, []);
        $methods = array_unique($methods);
        $response = new Response('', 200, [
          'Allow' => implode(', ', $methods),
        ]);
        $event
          ->setResponse($response);
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {

    // Set a high priority so it is executed before routing.
    $events[KernelEvents::REQUEST][] = [
      'onRequest',
      1000,
    ];
    return $events;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
OptionsRequestSubscriber::$routeProvider	protected	property	The route provider.
OptionsRequestSubscriber::getSubscribedEvents	public static	function	Returns an array of event names this subscriber wants to listen to.
OptionsRequestSubscriber::onRequest	public	function	Tries to handle the options request.
OptionsRequestSubscriber::__construct	public	function	Creates a new OptionsRequestSubscriber instance.