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<?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 Psr\Container\ContainerInterface;
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 onto the request on the "kernel.request" event and saves
* it on the "kernel.response" event.
*
* In addition, if the session has been started it overrides the Cache-Control
* header in such a way that all caching is disabled in that case.
* If you have a scenario where caching responses with session information in
* them makes sense, you can disable this behaviour by setting the header
* AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER on the response.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
* @author Tobias Schultze <http://tobion.de>
*
* @internal since Symfony 4.3
*/
abstract class AbstractSessionListener implements EventSubscriberInterface
{
const NO_AUTO_CACHE_CONTROL_HEADER = 'Symfony-Session-NoAutoCacheControl';
protected $container;
private $sessionUsageStack = [];
public function __construct(ContainerInterface $container = null)
{
$this->container = $container;
}
public function onKernelRequest(GetResponseEvent $event)
{
if (!$event->isMasterRequest()) {
return;
}
$session = null;
$request = $event->getRequest();
if ($request->hasSession()) {
// no-op
} elseif (method_exists($request, 'setSessionFactory')) {
$request->setSessionFactory(function () { return $this->getSession(); });
} elseif ($session = $this->getSession()) {
$request->setSession($session);
}
$session = $session ?? ($this->container && $this->container->has('initialized_session') ? $this->container->get('initialized_session') : null);
$this->sessionUsageStack[] = $session instanceof Session ? $session->getUsageIndex() : 0;
}
public function onKernelResponse(FilterResponseEvent $event)
{
if (!$event->isMasterRequest()) {
return;
}
$response = $event->getResponse();
$autoCacheControl = !$response->headers->has(self::NO_AUTO_CACHE_CONTROL_HEADER);
// Always remove the internal header if present
$response->headers->remove(self::NO_AUTO_CACHE_CONTROL_HEADER);
if (!$session = $this->container && $this->container->has('initialized_session') ? $this->container->get('initialized_session') : $event->getRequest()->getSession()) {
return;
}
if ($session instanceof Session ? $session->getUsageIndex() !== end($this->sessionUsageStack) : $session->isStarted()) {
if ($autoCacheControl) {
$response
->setPrivate()
->setMaxAge(0)
->headers->addCacheControlDirective('must-revalidate');
}
}
if ($session->isStarted()) {
/*
* Saves the session, in case it is still open, before sending the response/headers.
*
* This ensures several things in case the developer did not save the session explicitly:
*
* * If a session save handler without locking is used, it ensures the data is available
* on the next request, e.g. after a redirect. PHPs auto-save at script end via
* session_register_shutdown is executed after fastcgi_finish_request. So in this case
* the data could be missing the next request because it might not be saved the moment
* the new request is processed.
* * A locking save handler (e.g. the native 'files') circumvents concurrency problems like
* the one above. But by saving the session before long-running things in the terminate event,
* we ensure the session is not blocked longer than needed.
* * When regenerating the session ID no locking is involved in PHPs session design. See
* https://bugs.php.net/bug.php?id=61470 for a discussion. So in this case, the session must
* be saved anyway before sending the headers with the new session ID. Otherwise session
* data could get lost again for concurrent requests with the new ID. One result could be
* that you get logged out after just logging in.
*
* This listener should be executed as one of the last listeners, so that previous listeners
* can still operate on the open session. This prevents the overhead of restarting it.
* Listeners after closing the session can still work with the session as usual because
* Symfonys session implementation starts the session on demand. So writing to it after
* it is saved will just restart it.
*/
$session->save();
}
}
/**
* @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, but higher than StreamedResponseListener
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();
}
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