<?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.
*/
namespace Symfony\Component\HttpKernel\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Sets the session in the request.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
abstract class AbstractSessionListener implements EventSubscriberInterface
{
private $sessionUsageStack = [];
public function onKernelRequest(GetResponseEvent $event)
{
if (!$event->isMasterRequest()) {
return;
}
$request = $event->getRequest();
$session = $this->getSession();
$this->sessionUsageStack[] = $session instanceof Session ? $session->getUsageIndex() : null;
if (null === $session || $request->hasSession()) {
return;
}
$request->setSession($session);
}
public function onKernelResponse(FilterResponseEvent $event)
{
if (!$event->isMasterRequest()) {
return;
}
if (!$session = $event->getRequest()->getSession()) {
return;
}
if ($session instanceof Session ? $session->getUsageIndex() !== end($this->sessionUsageStack) : $session->isStarted()) {
$event->getResponse()
->setExpires(new \DateTime())
->setPrivate()
->setMaxAge(0)
->headers->addCacheControlDirective('must-revalidate');
}
}
/**
* @internal
*/
public function onFinishRequest(FinishRequestEvent $event)
{
if ($event->isMasterRequest()) {
array_pop($this->sessionUsageStack);
}
}
public static function getSubscribedEvents()
{
return [
KernelEvents::REQUEST => ['onKernelRequest', 128],
// low priority to come after regular response listeners, same as SaveSessionListener
KernelEvents::RESPONSE => ['onKernelResponse', -1000],
KernelEvents::FINISH_REQUEST => ['onFinishRequest'],
];
}
/**
* Gets the session object.
*
* @return SessionInterface|null A SessionInterface instance or null if no session is available
*/
abstract protected function getSession();
}