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AbstractSessionListener.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * 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\HttpFoundation\Session\Session;
16 use Symfony\Component\HttpFoundation\Session\SessionInterface;
17 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
18 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
19 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
20 use Symfony\Component\HttpKernel\KernelEvents;
21
22 /**
23 * Sets the session in the request.
24 *
25 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
26 */
27 abstract class AbstractSessionListener implements EventSubscriberInterface
28 {
29 private $sessionUsageStack = [];
30
31 public function onKernelRequest(GetResponseEvent $event)
32 {
33 if (!$event->isMasterRequest()) {
34 return;
35 }
36
37 $request = $event->getRequest();
38 $session = $this->getSession();
39 $this->sessionUsageStack[] = $session instanceof Session ? $session->getUsageIndex() : null;
40 if (null === $session || $request->hasSession()) {
41 return;
42 }
43
44 $request->setSession($session);
45 }
46
47 public function onKernelResponse(FilterResponseEvent $event)
48 {
49 if (!$event->isMasterRequest()) {
50 return;
51 }
52
53 if (!$session = $event->getRequest()->getSession()) {
54 return;
55 }
56
57 if ($session instanceof Session ? $session->getUsageIndex() !== end($this->sessionUsageStack) : $session->isStarted()) {
58 $event->getResponse()
59 ->setExpires(new \DateTime())
60 ->setPrivate()
61 ->setMaxAge(0)
62 ->headers->addCacheControlDirective('must-revalidate');
63 }
64 }
65
66 /**
67 * @internal
68 */
69 public function onFinishRequest(FinishRequestEvent $event)
70 {
71 if ($event->isMasterRequest()) {
72 array_pop($this->sessionUsageStack);
73 }
74 }
75
76 public static function getSubscribedEvents()
77 {
78 return [
79 KernelEvents::REQUEST => ['onKernelRequest', 128],
80 // low priority to come after regular response listeners, same as SaveSessionListener
81 KernelEvents::RESPONSE => ['onKernelResponse', -1000],
82 KernelEvents::FINISH_REQUEST => ['onFinishRequest'],
83 ];
84 }
85
86 /**
87 * Gets the session object.
88 *
89 * @return SessionInterface|null A SessionInterface instance or null if no session is available
90 */
91 abstract protected function getSession();
92 }
93