vendor/symfony/http-kernel/EventListener/DisallowRobotsIndexingListener.php line 27

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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\KernelEvents;
  18. /**
  19. * Ensures that the application is not indexed by search engines.
  20. *
  21. * @author Gary PEGEOT <garypegeot@gmail.com>
  22. */
  23. class DisallowRobotsIndexingListener implements EventSubscriberInterface
  24. {
  25. private const HEADER_NAME = 'X-Robots-Tag';
  27. public function onResponse(ResponseEvent $event): void
  28. {
  29. if (!$event->getResponse()->headers->has(static::HEADER_NAME)) {
  30. $event->getResponse()->headers->set(static::HEADER_NAME, 'noindex');
  31. }
  32. }
  34. /**
  35. * {@inheritdoc}
  36. */
  37. public static function getSubscribedEvents()
  38. {
  39. return [
  40. KernelEvents::RESPONSE => ['onResponse', -255],
  41. ];
  42. }
  43. }