Version 1

[yaffs-website] / web / core / lib / Drupal / Core / EventSubscriber / RouteAccessResponseSubscriber.php

diff --git a/web/core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php b/web/core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php
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+++ b/web/core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Core\Cache\CacheableResponseInterface;
+use Drupal\Core\Routing\AccessAwareRouterInterface;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Response subscriber to bubble the route's access result's cacheability.
+ *
+ * During routing, access checking is performed. The corresponding access result
+ * is stored in the Request object's attributes, just like the matching route
+ * object is. In case of a cacheable response, the route's access result also
+ * determined the content of the response, and therefore the cacheability of the
+ * route's access result should also be applied to the resulting response.
+ *
+ * @see \Drupal\Core\Routing\AccessAwareRouterInterface::ACCESS_RESULT
+ * @see \Drupal\Core\Routing\AccessAwareRouter::matchRequest()
+ * @see \Drupal\Core\Routing\AccessAwareRouter::checkAccess()
+ */
+class RouteAccessResponseSubscriber implements EventSubscriberInterface {
+
+  /**
+   * Bubbles the route's access result' cacheability metadata.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
+   *   The event to process.
+   */
+  public function onRespond(FilterResponseEvent $event) {
+    if (!$event->isMasterRequest()) {
+      return;
+    }
+
+    $response = $event->getResponse();
+    if (!$response instanceof CacheableResponseInterface) {
+      return;
+    }
+
+    $request = $event->getRequest();
+    $access_result = $request->attributes->get(AccessAwareRouterInterface::ACCESS_RESULT);
+    $response->addCacheableDependency($access_result);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    // Priority 10, so that it runs before FinishResponseSubscriber, which will
+    // expose the cacheability metadata in the form of headers.
+    $events[KernelEvents::RESPONSE][] = ['onRespond', 10];
+    return $events;
+  }
+
+}