added a Controller:getUser() shortcut to recover the current user

src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php

@@ -165,6 +165,24 @@ class Controller extends ContainerAware
         return $this->container->get('doctrine');
     }
 
+    /**
+     * Get a user from the Security Context
+     *
+     * @return mixed
+     *
+     * @throws \LogicException If SecurityBundle is not available
+     */
+    public function getUser()
+    {
+        if (!$this->container->has('security.context')) {
+            throw new \LogicException('The SecurityBundle is not installed in your application.');
+        }
+
+        $token = $this->container->get('security.context')->getToken();
+
+        return null === $token ?: $token->getUser();
+    }
+
     /**
      * Returns true if the service id is defined.
      *