vendor/symfony/web-link/EventListener/AddLinkHeaderListener.php line 39

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  1. <?php
  3. /*
  4. * This file is part of the Symfony package.
  5. *
  6. * (c) Fabien Potencier <fabien@symfony.com>
  7. *
  8. * For the full copyright and license information, please view the LICENSE
  9. * file that was distributed with this source code.
  10. */
  12. namespace Symfony\Component\WebLink\EventListener;
  14. use Psr\Link\LinkProviderInterface;
  15. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  16. use Symfony\Component\HttpKernel\Event\ResponseEvent;
  17. use Symfony\Component\HttpKernel\KernelEvents;
  18. use Symfony\Component\WebLink\HttpHeaderSerializer;
  20. // Help opcache.preload discover always-needed symbols
  21. class_exists(HttpHeaderSerializer::class);
  23. /**
  24. * Adds the Link HTTP header to the response.
  25. *
  26. * @author Kévin Dunglas <dunglas@gmail.com>
  27. *
  28. * @final
  29. */
  30. class AddLinkHeaderListener implements EventSubscriberInterface
  31. {
  32. private $serializer;
  34. public function __construct()
  35. {
  36. $this->serializer = new HttpHeaderSerializer();
  37. }
  39. public function onKernelResponse(ResponseEvent $event)
  40. {
  41. if (!$event->isMainRequest()) {
  42. return;
  43. }
  45. $linkProvider = $event->getRequest()->attributes->get('_links');
  46. if (!$linkProvider instanceof LinkProviderInterface || !$links = $linkProvider->getLinks()) {
  47. return;
  48. }
  50. $event->getResponse()->headers->set('Link', $this->serializer->serialize($links), false);
  51. }
  53. /**
  54. * {@inheritdoc}
  55. */
  56. public static function getSubscribedEvents(): array
  57. {
  58. return [KernelEvents::RESPONSE => 'onKernelResponse'];
  59. }
  60. }