bug symfony#25151 [FrameworkBundle] Automatically enable the CSRF protection if CSRF manager exists (sroze)

This PR was merged into the 3.4 branch.

Discussion
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[FrameworkBundle] Automatically enable the CSRF protection if CSRF manager exists

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ø
| License       | MIT

This will automatically enable the CSRF protection if `CsrfTokenManagerInterface` exists.

Commits
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fd43406 Automatically enable the CSRF protection if CSRF manager exists

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -21,6 +21,7 @@
 use Symfony\Component\Form\Form;
 use Symfony\Component\Lock\Lock;
 use Symfony\Component\Lock\Store\SemaphoreStore;
+use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 use Symfony\Component\Serializer\Serializer;
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Validator\Validation;
@@ -142,7 +143,7 @@ private function addCsrfSection(ArrayNodeDefinition $rootNode)
         $rootNode
             ->children()
                 ->arrayNode('csrf_protection')
-                    ->canBeEnabled()
+                    ->{!class_exists(FullStack::class) && class_exists(CsrfTokenManagerInterface::class) ? 'canBeDisabled' : 'canBeEnabled'}()
                 ->end()
             ->end()
         ;