Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\EventSubscriber;
Chris@0: 
Chris@14: use Drupal\Core\Cache\CacheableDependencyInterface;
Chris@14: use Drupal\Core\Cache\CacheableJsonResponse;
Chris@0: use Symfony\Component\HttpFoundation\JsonResponse;
Chris@0: use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
Chris@0: 
Chris@0: /**
Chris@0:  * Default handling for JSON errors.
Chris@0:  */
Chris@0: class ExceptionJsonSubscriber extends HttpExceptionSubscriberBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function getHandledFormats() {
Chris@0:     return ['json', 'drupal_modal', 'drupal_dialog', 'drupal_ajax'];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected static function getPriority() {
Chris@0:     // This will fire after the most common HTML handler, since HTML requests
Chris@0:     // are still more common than JSON requests.
Chris@0:     return -75;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Handles all 4xx errors for JSON.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
Chris@0:    *   The event to process.
Chris@0:    */
Chris@0:   public function on4xx(GetResponseForExceptionEvent $event) {
Chris@0:     /** @var \Symfony\Component\HttpKernel\Exception\HttpExceptionInterface $exception */
Chris@0:     $exception = $event->getException();
Chris@14: 
Chris@14:     // If the exception is cacheable, generate a cacheable response.
Chris@14:     if ($exception instanceof CacheableDependencyInterface) {
Chris@14:       $response = new CacheableJsonResponse(['message' => $event->getException()->getMessage()], $exception->getStatusCode(), $exception->getHeaders());
Chris@14:       $response->addCacheableDependency($exception);
Chris@14:     }
Chris@14:     else {
Chris@14:       $response = new JsonResponse(['message' => $event->getException()->getMessage()], $exception->getStatusCode(), $exception->getHeaders());
Chris@14:     }
Chris@14: 
Chris@0:     $event->setResponse($response);
Chris@0:   }
Chris@0: 
Chris@0: }