vendor/symfony/http-kernel/EventListener/SurrogateListener.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\HttpKernel\EventListener;
  14. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  15. use Symfony\Component\HttpKernel\Event\ResponseEvent;
  16. use Symfony\Component\HttpKernel\HttpCache\HttpCache;
  17. use Symfony\Component\HttpKernel\HttpCache\SurrogateInterface;
  18. use Symfony\Component\HttpKernel\KernelEvents;
  20. /**
  21. * SurrogateListener adds a Surrogate-Control HTTP header when the Response needs to be parsed for Surrogates.
  22. *
  23. * @author Fabien Potencier <fabien@symfony.com>
  24. *
  25. * @final
  26. */
  27. class SurrogateListener implements EventSubscriberInterface
  28. {
  29. private $surrogate;
  31. public function __construct(?SurrogateInterface $surrogate = null)
  32. {
  33. $this->surrogate = $surrogate;
  34. }
  36. /**
  37. * Filters the Response.
  38. */
  39. public function onKernelResponse(ResponseEvent $event)
  40. {
  41. if (!$event->isMainRequest()) {
  42. return;
  43. }
  45. $kernel = $event->getKernel();
  46. $surrogate = $this->surrogate;
  47. if ($kernel instanceof HttpCache) {
  48. $surrogate = $kernel->getSurrogate();
  49. if (null !== $this->surrogate && $this->surrogate->getName() !== $surrogate->getName()) {
  50. $surrogate = $this->surrogate;
  51. }
  52. }
  54. if (null === $surrogate) {
  55. return;
  56. }
  58. $surrogate->addSurrogateControl($event->getResponse());
  59. }
  61. public static function getSubscribedEvents(): array
  62. {
  63. return [
  64. KernelEvents::RESPONSE => 'onKernelResponse',
  65. ];
  66. }
  67. }