Set up an AuthenticationSuccessHandler in Symfony2

Symfony2 allows you to simply make treatments after a login attempt success. As simple as you just have to define a service, called "security.authentication.success_handler" and make it to implement AuthenticationSuccessHandlerInterface...

In this example, I want logged new user to be redirected to a "Terms and conditions" accept form. I have to check the boolean property termsAndConditionsOk of the User entity to know if redirection applies.
AuthenticationSuccessHandlerInterface defines 1 method :

<?php

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace Symfony\Component\Security\Http\Authentication;

use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Interface for a custom authentication success handler
 *
 * If you want to customize the success handling process, instead of
 * overwriting the respective listener globally, you can set a custom success
 * handler which implements this interface.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
interface AuthenticationSuccessHandlerInterface
{
    /**
     * This is called when an interactive authentication attempt succeeds. This
     * is called by authentication listeners inheriting from
     * AbstractAuthenticationListener.
     *
     * @param Request        $request
     * @param TokenInterface $token
     *
     * @return Response the response to return
     */
    function onAuthenticationSuccess(Request $request, TokenInterface $token);
}

Definition of the service in a services.yml config file (i use YAML) :

parameters:

    security.authentication.success_handler.class: Xxx\YourBundle\Component\OverSf2\Security\Http\Authentication\AuthenticationSuccessHandler

services:

    security.authentication.success_handler:
        class: %security.authentication.success_handler.class%
        public: false
        arguments:  ['@router', '@security.user.entity_manager']

And here is the AuthenticationSuccessHandler itself :

<?php

namespace Xxx\YouBundle\Component\OverSf2\Security\Http\Authentication;

use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Security\Http\Authentication\AuthenticationSuccessHandlerInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\Routing\RouterInterface;
use Doctrine\ORM\EntityManager;
use Xxx\YourBundle\Entity\User;

/**
 * Custom authentication success handler
 */
class AuthenticationSuccessHandler implements AuthenticationSuccessHandlerInterface
{

   private $router;
   private $em;

   /**
    * Constructor
    * @param RouterInterface   $router
    * @param EntityManager     $em
    */
   public function __construct(RouterInterface $router, EntityManager $em)
   {
      $this->router = $router;
      $this->em = $em;
   }

   /**
    * This is called when an interactive authentication attempt succeeds. This
    * is called by authentication listeners inheriting from AbstractAuthenticationListener.
    * @param Request        $request
    * @param TokenInterface $token
    * @return Response The response to return
    */
   function onAuthenticationSuccess(Request $request, TokenInterface $token)
   {
      
      if (! $token->getUser()->getTermsAndConditionsOk())
      {
         $uri = $this->router->generate('_home');
      }
      else
      {
         $uri = $this->router->generate('_route_to terms_and_conditions_form');
      }

      return new RedirectResponse($uri);
   }
}