<?php/*
* 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.
*/namespaceSymfony\Component\HttpKernel\EventListener;
useSymfony\Component\HttpFoundation\Response;
useSymfony\Component\HttpKernel\HttpKernelInterface;
useSymfony\Component\HttpKernel\Event\FilterResponseEvent;
useSymfony\Component\HttpKernel\KernelEvents;
useSymfony\Component\HttpKernel\HttpCache\Esi;
useSymfony\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 EsiListenerimplements 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 functiononKernelResponse(FilterResponseEvent $event) {
if (HttpKernelInterface::MASTER_REQUEST !== $event
->getRequestType() || null === $this->esi) {
return;
}
$this->esi
->addSurrogateControl($event
->getResponse());
}
public static functiongetSubscribedEvents() {
returnarray(
KernelEvents::RESPONSE => 'onKernelResponse',
);
}
}