Fix EZP-20289 Symfony CSRF protection not integrated with legacy

This is the Symfony side of things injecting csrf settings if csrf is enabled
into api added in ezsystems/ezpublish-legacy#552

LegacyMapper/Configuration.php

@@ -14,6 +14,7 @@
 use eZ\Publish\Core\MVC\ConfigResolverInterface;
 use eZ\Publish\Core\MVC\Symfony\Cache\GatewayCachePurger;
 use ezpEvent;
+use ezxFormToken;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -32,15 +33,21 @@ class Configuration implements EventSubscriberInterface
      */
     private $gatewayCachePurger;
 
+    /**
+     * @var \Symfony\Component\DependencyInjection\ContainerInterface
+     */
+    private $container;
+
     /**
      * @var array
      */
     private $options;
 
-    public function __construct( ConfigResolverInterface $configResolver, GatewayCachePurger $gatewayCachePurger, array $options = array() )
+    public function __construct( ConfigResolverInterface $configResolver, GatewayCachePurger $gatewayCachePurger, ContainerInterface $container, array $options = array() )
     {
         $this->configResolver = $configResolver;
         $this->gatewayCachePurger = $gatewayCachePurger;
+        $this->container = $container;
         $this->options = $options;
     }
 
@@ -90,6 +97,14 @@ public function onBuildKernel( PreBuildKernelEvent $event )
             $settings + (array)$event->getParameters()->get( "injected-settings" )
         );
 
+        // Inject csrf protection settings to make sure legacy & symfony stack work together
+        if ( $this->container->hasParameter( 'form.type_extension.csrf.enabled' ) &&
+             $this->container->getParameter( 'form.type_extension.csrf.enabled' ) )
+        {
+            ezxFormToken::setSecret( $this->container->getParameter( 'kernel.secret' ) );
+            ezxFormToken::setFormField( $this->container->getParameter( 'form.type_extension.csrf.field_name' ) );
+        }
+
         // Register content/cache event listener
         ezpEvent::getInstance()->attach( 'content/cache', array( $this->gatewayCachePurger, 'purge' ) );
         ezpEvent::getInstance()->attach( 'content/cache/all', array( $this->gatewayCachePurger, 'purgeAll' ) );

Resources/config/services.yml

@@ -121,6 +121,7 @@ services:
         arguments:
             - @ezpublish.config.resolver.core
             - @ezpublish.http_cache.purger
+            - @service_container
             - %ezpublish_legacy.configuration_mapper.options%
         tags:
             - { name: kernel.event_subscriber }