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   1  <?php
   2  
   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   */
  11  
  12  namespace Symfony\Component\HttpKernel\EventListener;
  13  
  14  use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  15  use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
  16  use Symfony\Component\HttpKernel\HttpCache\SurrogateInterface;
  17  use Symfony\Component\HttpKernel\KernelEvents;
  18  
  19  /**
  20   * SurrogateListener adds a Surrogate-Control HTTP header when the Response needs to be parsed for Surrogates.
  21   *
  22   * @author Fabien Potencier <fabien@symfony.com>
  23   */
  24  class SurrogateListener implements EventSubscriberInterface
  25  {
  26      private $surrogate;
  27  
  28      public function __construct(SurrogateInterface $surrogate = null)
  29      {
  30          $this->surrogate = $surrogate;
  31      }
  32  
  33      /**
  34       * Filters the Response.
  35       */
  36      public function onKernelResponse(FilterResponseEvent $event)
  37      {
  38          if (!$event->isMasterRequest() || null === $this->surrogate) {
  39              return;
  40          }
  41  
  42          $this->surrogate->addSurrogateControl($event->getResponse());
  43      }
  44  
  45      public static function getSubscribedEvents()
  46      {
  47          return array(
  48              KernelEvents::RESPONSE => 'onKernelResponse',
  49          );
  50      }
  51  }