Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\EventSubscriber;
Chris@0: 
Chris@0: use Symfony\Cmf\Component\Routing\RouteProviderInterface;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: use Symfony\Component\HttpFoundation\Response;
Chris@0: use Symfony\Component\HttpKernel\Event\GetResponseEvent;
Chris@0: use Symfony\Component\HttpKernel\KernelEvents;
Chris@0: use Symfony\Component\Routing\Route;
Chris@0: 
Chris@0: /**
Chris@0:  * Handles options requests.
Chris@0:  *
Chris@0:  * Therefore it sends a options response using all methods on all possible
Chris@0:  * routes.
Chris@0:  */
Chris@0: class OptionsRequestSubscriber implements EventSubscriberInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The route provider.
Chris@0:    *
Chris@0:    * @var \Symfony\Cmf\Component\Routing\RouteProviderInterface
Chris@0:    */
Chris@0:   protected $routeProvider;
Chris@0: 
Chris@0:   /**
Chris@0:    * Creates a new OptionsRequestSubscriber instance.
Chris@0:    *
Chris@0:    * @param \Symfony\Cmf\Component\Routing\RouteProviderInterface $route_provider
Chris@0:    *   The route provider.
Chris@0:    */
Chris@0:   public function __construct(RouteProviderInterface $route_provider) {
Chris@0:     $this->routeProvider = $route_provider;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Tries to handle the options request.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
Chris@0:    *   The request event.
Chris@0:    */
Chris@0:   public function onRequest(GetResponseEvent $event) {
Chris@0:     if ($event->getRequest()->isMethod('OPTIONS')) {
Chris@0:       $routes = $this->routeProvider->getRouteCollectionForRequest($event->getRequest());
Chris@0:       // In case we don't have any routes, a 403 should be thrown by the normal
Chris@0:       // request handling.
Chris@0:       if (count($routes) > 0) {
Chris@0:         $methods = array_map(function (Route $route) {
Chris@0:           return $route->getMethods();
Chris@0:         }, $routes->all());
Chris@0:         // Flatten and unique the available methods.
Chris@0:         $methods = array_unique(call_user_func_array('array_merge', $methods));
Chris@0:         $response = new Response('', 200, ['Allow' => implode(', ', $methods)]);
Chris@0:         $event->setResponse($response);
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     // Set a high priority so it is executed before routing.
Chris@0:     $events[KernelEvents::REQUEST][] = ['onRequest', 1000];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }