Fix #105

EventListener/TagSubscriber.php

@@ -15,7 +15,6 @@
 use FOS\HttpCacheBundle\Configuration\Tag;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
@@ -78,10 +77,7 @@ public function onKernelResponse(FilterResponseEvent $event)
                 $tags[] = $tag;
             }
             foreach ($configuredTags['expressions'] as $expression) {
-                $tags[] = $this->expressionLanguage->evaluate($expression, array(
-                    'request' => $request,
-                    'response' => $response,
-                ));
+                $tags[] = $this->evaluateTag($expression, $request);
             }
         }
 
@@ -98,6 +94,16 @@ public function onKernelResponse(FilterResponseEvent $event)
         }
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function getSubscribedEvents()
+    {
+        return array(
+            KernelEvents::RESPONSE => 'onKernelResponse'
+        );
+    }
+
     /**
      * Get the tags from the annotations on the controller that was used in the
      * request.
@@ -118,9 +124,9 @@ private function getAnnotationTags(Request $request)
         $tags = array();
         foreach ($tagConfigurations as $tagConfiguration) {
             if (null !== $tagConfiguration->getExpression()) {
-                $tags[] = $this->expressionLanguage->evaluate(
+                $tags[] = $this->evaluateTag(
                     $tagConfiguration->getExpression(),
-                    $request->attributes->all()
+                    $request
                 );
             } else {
                 $tags = array_merge($tags, $tagConfiguration->getTags());
@@ -131,12 +137,19 @@ private function getAnnotationTags(Request $request)
     }
 
     /**
-     * {@inheritdoc}
+     * Evaluate a tag that contains expressions
+     *
+     * @param string  $expression
+     * @param Request $request
+     *
+     * @return string Evaluaated tag
      */
-    public static function getSubscribedEvents()
+    private function evaluateTag($expression, Request $request)
     {
-        return array(
-            KernelEvents::RESPONSE => 'onKernelResponse'
+        return $this->expressionLanguage->evaluate(
+            $expression,
+            $request->attributes->all()
         );
     }
+
 }

Resources/doc/reference/annotations.rst

@@ -114,7 +114,7 @@ response::
      */
     public function showAction($id)
     {
-        // Assume $id equals 123
+        // Assume request parameter $id equals 123
     }
 
 Or, using a `param converter`_::

Resources/doc/reference/configuration/tags.rst

@@ -2,7 +2,8 @@ tags
 ====
 
 Create tag rules in your application configuration to set tags on responses
-and invalidate them.
+and invalidate them. See the :doc:`tagging feature chapter </features/tagging>`
+for an introduction.
 
 .. include:: /includes/enabled.rst
 
@@ -40,6 +41,14 @@ invalidated instead.
 
 .. include:: /includes/match.rst
 
+tags
+^^^^
+
+**type**: ``array``
+
+Tags that should be set on responses to safe requests; or invalidated for
+unsafe requests.
+
 .. code-block:: yaml
 
     # app/config/config.yml
@@ -51,14 +60,27 @@ invalidated instead.
                         path: ^/news
                     tags: [news-section]
 
-.. note::
-
-    See further the :doc:`tagging feature description </features/tagging>`.
 
-tags
-^^^^
+tag_expressions
+~~~~~~~~~~~~~~~
 
 **type**: ``array``
 
-Tags that should be set on responses to safe requests; or invalidated for
-unsafe requests.
+You can dynamically refer to request attributes using
+:ref:`expressions <expression language requirement>`. Assume a route
+``/articles/{id}``. A request to path ``/articles/123`` will set/invalidate
+tag ``articles-123`` with the following configuration:
+
+.. code-block:: yaml
+
+    # app/config/config.yml
+    fos_http_cache:
+        tags:
+            rules:
+                -
+                    match:
+                        path: ^/articles
+                    tags: [articles]
+                    tag_expressions: ["'article-'~id"]
+
+You can combine ``tags`` and ``tag_expression`` in one rule.

Tests/Functional/EventListener/CacheControlSubscriberTest.php

@@ -19,7 +19,7 @@ public function testIsCached()
     {
         $client = static::createClient();
 
-        $client->request('GET', '/cached');
+        $client->request('GET', '/cached/42');
         $response = $client->getResponse();
         $this->assertEquals('public', $response->headers->get('Cache-Control'));
     }

Tests/Functional/EventListener/TagSubscriberTest.php

@@ -63,9 +63,9 @@ public function testConfigurationTagsAreSet()
     {
         $client = static::createClient();
 
-        $client->request('GET', '/cached');
+        $client->request('GET', '/cached/51');
         $response = $client->getResponse();
-        $this->assertEquals('area', $response->headers->get('X-Cache-Tags'));
+        $this->assertEquals('area,area-51', $response->headers->get('X-Cache-Tags'));
     }
 
     public function testConfigurationTagsAreInvalidated()
@@ -76,11 +76,11 @@ public function testConfigurationTagsAreInvalidated()
             'fos_http_cache.cache_manager',
             '\FOS\HttpCacheBundle\CacheManager'
         )
-            ->shouldReceive('invalidateTags')->once()->with(array('area'))
+            ->shouldReceive('invalidateTags')->once()->with(array('area', 'area-51'))
             ->shouldReceive('flush')->once()
         ;
 
-        $client->request('POST', '/cached');
+        $client->request('PUT', '/cached/51');
     }
 
     protected function tearDown()

Tests/Functional/Fixtures/Controller/TestController.php

@@ -47,8 +47,8 @@ public function errorAction()
         return new Response('Forbidden', 403);
     }
 
-    public function contentAction()
+    public function contentAction($id = null)
     {
-        return new Response('content');
+        return new Response('content ' . $id);
     }
 }

Tests/Functional/Fixtures/app/config/config.yml

@@ -23,6 +23,7 @@ fos_http_cache:
         match:
           path: ^/cached
         tags: [area]
+        tag_expressions: ["'area-'~id"]
   user_context:
     user_identifier_headers:
       - Cookie

Tests/Functional/Fixtures/app/config/routing.yml

@@ -1,24 +1,25 @@
 test_list:
-  pattern:   /test/list
-  defaults:  { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::listAction }
+  pattern:  /test/list
+  defaults: { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::listAction }
   methods:  [GET]
 
 test_error:
-  pattern:   /test/error
-  defaults:  { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::errorAction }
+  pattern:  /test/error
+  defaults: { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::errorAction }
 
 test_one:
-  pattern:   /test/{id}
-  defaults:  { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::itemAction }
+  pattern:  /test/{id}
+  defaults: { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::itemAction }
   methods:  [GET,POST]
 
 test_cached:
-  pattern:  /cached
-  defaults:  { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::contentAction }
+  pattern:  /cached/{id}
+  defaults: { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::contentAction }
+  methods:  [GET,PUT]
 
 test_noncached:
   pattern:  /noncached
-  defaults:  { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::contentAction }
+  defaults: { _controller: FOS\HttpCacheBundle\Tests\Functional\Fixtures\Controller\TestController::contentAction }
 
 test_logout:
   pattern:  /secured_area/logout

Tests/Unit/EventListener/TagSubscriberTest.php

@@ -68,7 +68,7 @@ public function testOnKernelResponseGet()
         ;
         $this->listener->addRule($mockMatcher, array(
             'tags' => array('configured-tag'),
-            'expressions' => array('"item-" ~ request.attributes.get("id")'),
+            'expressions' => array('"item-" ~ id'),
         ));
         $this->listener->onKernelResponse($event);
 
@@ -123,7 +123,7 @@ public function testOnKernelResponsePost()
         ;
         $this->listener->addRule($mockMatcher, array(
             'tags' => array('configured-tag'),
-            'expressions' => array('"item-" ~ request.attributes.get("id")'),
+            'expressions' => array('"item-" ~ id'),
         ));
         $this->listener->onKernelResponse($event);
     }