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