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<?php |
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namespace Drupal\df_tools_services\EventSubscriber; |
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use Drupal\Core\Routing\RouteBuildEvent; |
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use Drupal\Core\Routing\RoutingEvents; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpKernel\KernelEvents; |
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use Symfony\Component\HttpKernel\Event\FilterResponseEvent; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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class DFToolsServicesSubscriber implements EventSubscriberInterface { |
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/** |
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* Forces CORS enablement for all responses. |
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* |
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* @param FilterResponseEvent $event |
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*/ |
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public function allowCORSResponse(FilterResponseEvent $event) { |
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$response = $event->getResponse(); |
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$request = $event->getRequest(); |
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// Forcibly allow CORS for the purposes of the headless demo. |
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if ($request->getMethod() == 'OPTIONS') { |
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$response = new Response(); |
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$this->setCORSHeaders($response); |
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$response->send(); |
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exit; |
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} |
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if ($response) { |
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$this->setCORSHeaders($response); |
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} |
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} |
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/** |
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* Allows OPTIONS as an acceptable method for all Drupal routes. |
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* |
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* @param RouteBuildEvent $event |
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*/ |
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public function allowOPTIONSRoute(RouteBuildEvent $event) { |
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$collection = $event->getRouteCollection(); |
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$routes = $collection->all(); |
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foreach ($routes as $name => $route) { |
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$methods = $route->getMethods(); |
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if (!in_array('OPTIONS', $methods)) { |
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$methods[] = 'OPTIONS'; |
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$route->setMethods($methods); |
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$collection->add($name, $route); |
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} |
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} |
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} |
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/** |
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* Sets headers required to enable CORS. |
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* |
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* @param Response $response |
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*/ |
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protected function setCORSHeaders($response) { |
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$response->headers->set('Access-Control-Allow-Origin', '*'); |
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$response->headers->set('Access-Control-Allow-Methods', 'GET,POST,PUT,PATCH,DELETE,OPTIONS'); |
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$response->headers->set('Access-Control-Allow-Headers', 'Authorization, Origin, Accept, Content-Type, X-CSRF-Token'); |
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$response->headers->set('Access-Control-Allow-Credentials', 'true'); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function getSubscribedEvents() { |
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$events = []; |
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$events[KernelEvents::RESPONSE][] = ['allowCORSResponse']; |
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$events[RoutingEvents::ALTER][] = ['allowOPTIONSRoute']; |
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return $events; |
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} |
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} |
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acquia /
df
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In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.