/usr/share/php/Symfony/Component/HttpKernel/EventListener/EsiListener.php is in php-symfony-http-kernel 2.3.21+dfsg-4+deb8u3.
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/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpKernel\EventListener;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\HttpCache\Esi;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* EsiListener adds a Surrogate-Control HTTP header when the Response needs to be parsed for ESI.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class EsiListener implements EventSubscriberInterface
{
private $esi;
/**
* Constructor.
*
* @param Esi $esi An ESI instance
*/
public function __construct(Esi $esi = null)
{
$this->esi = $esi;
}
/**
* Filters the Response.
*
* @param FilterResponseEvent $event A FilterResponseEvent instance
*/
public function onKernelResponse(FilterResponseEvent $event)
{
if (HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType() || null === $this->esi) {
return;
}
$this->esi->addSurrogateControl($event->getResponse());
}
public static function getSubscribedEvents()
{
return array(
KernelEvents::RESPONSE => 'onKernelResponse',
);
}
}
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