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<?php
namespace Drupal\Core\EventSubscriber;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ViewEvent;
use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Throws 406 if requesting non-HTML format and controller returns render array.
*/
class RenderArrayNonHtmlSubscriber implements EventSubscriberInterface {
/**
* Throws an HTTP 406 error if client requested a non-HTML format.
*
* @param \Symfony\Component\HttpKernel\Event\ViewEvent $event
* The event to process.
*/
public function onRespond(ViewEvent $event) {
$request = $event->getRequest();
$result = $event->getControllerResult();
// If this is a render array then we assume that the router went with the
// generic controller and not one with a format. If the format requested is
// not HTML though, we can also assume that the requested format is invalid
// so we provide a 406 response.
if (is_array($result) && $request->getRequestFormat() !== 'html') {
throw new NotAcceptableHttpException('Not acceptable format: ' . $request->getRequestFormat());
}
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events[KernelEvents::VIEW][] = ['onRespond', -10];
return $events;
}
}
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