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<?php
namespace Drupal\Core\EventSubscriber;
use Drupal\Core\Routing\RouteProviderInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Routing\Route;
/**
* Handles options requests.
*
* Listens to KernelEvents::REQUEST and responds to OPTIONS requests by
* providing an Allow header listing all the HTTP methods allowed for the
* requested routes.
*/
class OptionsRequestSubscriber implements EventSubscriberInterface {
/**
* The route provider.
*
* @var \Drupal\Core\Routing\RouteProviderInterface
*/
protected $routeProvider;
/**
* Creates a new OptionsRequestSubscriber instance.
*
* @param \Drupal\Core\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\RequestEvent $event
* The request event.
*/
public function onRequest(RequestEvent $event) {
if ($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(): array {
// Set a high priority so it is executed before routing.
$events[KernelEvents::REQUEST][] = ['onRequest', 1000];
return $events;
}
}
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