[FrameworkBundle] start session on flashbag injection

src/Symfony/Bundle/FrameworkBundle/Resources/config/session.xml

@@ -13,8 +13,6 @@
 
         <service id="session" class="Symfony\Component\HttpFoundation\Session\Session" public="true">
             <argument type="service" id="session.storage" />
-            <argument type="service" id="session.attribute_bag" />
-            <argument type="service" id="session.flash_bag" />
         </service>
 
         <service id="Symfony\Component\HttpFoundation\Session\SessionInterface" alias="session" />
@@ -37,10 +35,14 @@
             <argument type="service" id="session.storage.metadata_bag" />
         </service>
 
-        <service id="session.flash_bag" class="Symfony\Component\HttpFoundation\Session\Flash\FlashBag" />
+        <service id="session.flash_bag" class="Symfony\Component\HttpFoundation\Session\Flash\FlashBag">
+            <factory service="session" method="getFlashBag"/>
+        </service>
         <service id="Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface" alias="session.flash_bag" />
 
-        <service id="session.attribute_bag" class="Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag" />
+        <service id="session.attribute_bag" class="Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag">
+            <factory service="session" method="getAttributeBag"/>
+        </service>
 
         <service id="session.storage.mock_file" class="Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage">
             <argument>%kernel.cache_dir%/sessions</argument>

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/InjectedFlashbagSessionController.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\Controller;
+
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
+use Symfony\Component\Routing\RouterInterface;
+
+class InjectedFlashbagSessionController
+{
+    /**
+     * @var FlashBagInterface
+     */
+    private $flashBag;
+
+    /**
+     * @var RouterInterface
+     */
+    private $router;
+
+    public function __construct(
+        FlashBagInterface $flashBag,
+        RouterInterface $router
+    ) {
+        $this->flashBag = $flashBag;
+        $this->router = $router;
+    }
+
+    public function setFlashAction(Request $request, $message)
+    {
+        $this->flashBag->add('notice', $message);
+
+        return new RedirectResponse($this->router->generate('session_showflash'));
+    }
+}

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Resources/config/routing.yml

@@ -18,6 +18,10 @@ session_setflash:
     path:     /session_setflash/{message}
     defaults: { _controller: TestBundle:Session:setFlash}
 
+injected_flashbag_session_setflash:
+    path:     injected_flashbag/session_setflash/{message}
+    defaults: { _controller: TestBundle:InjectedFlashbagSession:setFlash}
+
 session_showflash:
     path:     /session_showflash
     defaults: { _controller: TestBundle:Session:showFlash}

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SessionTest.php

@@ -69,6 +69,29 @@ public function testFlash($config, $insulate)
         $this->assertStringContainsString('No flash was set.', $crawler->text());
     }
 
+    /**
+     * Tests flash messages work when flashbag service is injected to the constructor.
+     *
+     * @dataProvider getConfigs
+     */
+    public function testFlashOnInjectedFlashbag($config, $insulate)
+    {
+        $client = $this->createClient(['test_case' => 'Session', 'root_config' => $config]);
+        if ($insulate) {
+            $client->insulate();
+        }
+
+        // set flash
+        $client->request('GET', '/injected_flashbag/session_setflash/Hello%20world.');
+
+        // check flash displays on redirect
+        $this->assertStringContainsString('Hello world.', $client->followRedirect()->text());
+
+        // check flash is gone
+        $crawler = $client->request('GET', '/session_showflash');
+        $this->assertStringContainsString('No flash was set.', $crawler->text());
+    }
+
     /**
      * See if two separate insulated clients can run without
      * polluting each other's session data.

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/Session/config.yml

@@ -5,3 +5,7 @@ services:
     Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\Controller\SubRequestController:
         tags:
             - { name: controller.service_arguments, action: indexAction, argument: handler, id: fragment.handler }
+
+    Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestBundle\Controller\InjectedFlashbagSessionController:
+        autowire: true
+        tags: ['controller.service_arguments']