Mercurial > hg > isophonics-drupal-site
view core/lib/Drupal/Core/EventSubscriber/AnonymousUserResponseSubscriber.php @ 12:7a779792577d
Update Drupal core to v8.4.5 (via Composer)
author | Chris Cannam |
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date | Fri, 23 Feb 2018 15:52:07 +0000 |
parents | 4c8ae668cc8c |
children |
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<?php namespace Drupal\Core\EventSubscriber; use Drupal\Core\Cache\CacheableMetadata; use Drupal\Core\Cache\CacheableResponseInterface; use Drupal\Core\Session\AccountInterface; use Symfony\Component\HttpKernel\Event\FilterResponseEvent; use Symfony\Component\HttpKernel\KernelEvents; use Symfony\Component\EventDispatcher\EventSubscriberInterface; /** * Response subscriber to handle finished responses for the anonymous user. */ class AnonymousUserResponseSubscriber implements EventSubscriberInterface { /** * The current user. * * @var \Drupal\Core\Session\AccountInterface */ protected $currentUser; /** * Constructs an AnonymousUserResponseSubscriber object. * * @param \Drupal\Core\Session\AccountInterface $current_user * The current user. */ public function __construct(AccountInterface $current_user) { $this->currentUser = $current_user; } /** * Adds a cache tag if the 'user.permissions' cache context is present. * * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event * The event to process. */ public function onRespond(FilterResponseEvent $event) { if (!$event->isMasterRequest()) { return; } if (!$this->currentUser->isAnonymous()) { return; } $response = $event->getResponse(); if (!$response instanceof CacheableResponseInterface) { return; } // The 'user.permissions' cache context ensures that if the permissions for // a role are modified, users are not served stale render cache content. // But, when entire responses are cached in reverse proxies, the value for // the cache context is never calculated, causing the stale response to not // be invalidated. Therefore, when varying by permissions and the current // user is the anonymous user, also add the cache tag for the 'anonymous' // role. if (in_array('user.permissions', $response->getCacheableMetadata()->getCacheContexts())) { $per_permissions_response_for_anon = new CacheableMetadata(); $per_permissions_response_for_anon->setCacheTags(['config:user.role.anonymous']); $response->addCacheableDependency($per_permissions_response_for_anon); } } /** * Registers the methods in this class that should be listeners. * * @return array * An array of event listener definitions. */ public static function getSubscribedEvents() { // Priority 5, so that it runs before FinishResponseSubscriber, but after // event subscribers that add the associated cacheability metadata (which // have priority 10). This one is conditional, so must run after those. $events[KernelEvents::RESPONSE][] = ['onRespond', 5]; return $events; } }