The form csrf extension should use the translator if available

Fixes #896

src/Silex/Provider/FormServiceProvider.php

@@ -55,9 +55,17 @@ public function register(Application $app)
             return array();
         });
 
+        $app['form.extension.csrf'] = $app->share(function ($app) {
+            if (isset($app['translator'])) {
+                return new CsrfExtension($app['form.csrf_provider'], $app['translator']);
+            }
+
+            return new CsrfExtension($app['form.csrf_provider']);
+        });
+
         $app['form.extensions'] = $app->share(function ($app) {
             $extensions = array(
-                new CsrfExtension($app['form.csrf_provider']),
+                $app['form.extension.csrf'],
                 new HttpFoundationExtension(),
             );
 

tests/Silex/Tests/Provider/FormServiceProviderTest.php

@@ -13,8 +13,11 @@
 
 use Silex\Application;
 use Silex\Provider\FormServiceProvider;
+use Silex\Provider\TranslationServiceProvider;
 use Symfony\Component\Form\AbstractTypeExtension;
+use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface;
 use Symfony\Component\Form\FormTypeGuesserChain;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\OptionsResolver\OptionsResolverInterface;
 
 class FormServiceProviderTest extends \PHPUnit_Framework_TestCase
@@ -59,6 +62,36 @@ public function testFormServiceProviderWillLoadTypeGuessers()
 
         $this->assertInstanceOf('Symfony\Component\Form\FormFactory', $app['form.factory']);
     }
+
+    public function testFormServiceProviderWillUseTranslatorIfAvailable()
+    {
+        $app = new Application();
+
+        $app->register(new FormServiceProvider());
+        $app->register(new TranslationServiceProvider());
+        $app['translator.domains'] = array(
+            'messages' => array(
+                'de' => array (
+                    'The CSRF token is invalid. Please try to resubmit the form.' => 'German translation',
+                )
+            )
+        );
+        $app['locale'] = 'de';
+
+        $app['form.csrf_provider'] = $app->share(function () {
+            return new FakeCsrfProvider();
+        });
+
+        $form = $app['form.factory']->createBuilder('form', array())
+            ->getForm();
+
+        $form->handleRequest($req = Request::create('/', 'POST', array('form' => array(
+            '_token' => 'the wrong token'
+        ))));
+
+        $this->assertFalse($form->isValid());
+        $this->assertContains('ERROR: German translation', $form->getErrorsAsString());
+    }
 }
 
 class DummyFormTypeExtension extends AbstractTypeExtension
@@ -73,3 +106,16 @@ public function setDefaultOptions(OptionsResolverInterface $resolver)
         $resolver->setOptional(array('image_path'));
     }
 }
+
+class FakeCsrfProvider implements CsrfProviderInterface
+{
+    public function generateCsrfToken($intention)
+    {
+        return $intention.'123';
+    }
+
+    public function isCsrfTokenValid($intention, $token)
+    {
+        return $token === $this->generateCsrfToken($intention);
+    }
+}