Stuff

<?php

namespace Acme\UserBundle\Security\Authentication\Token;
use Symfony\Component\Security\Core\Authentication\Token\AbstractToken;

class UserToken extends AbstractToken
{
    public function __construct($uid = '', array $roles = array())
    {
        parent::__construct($roles);
        $this->setUser($uid);
        if (!empty($uid)) {
            $this->setAuthenticated(true);
        }
    }

   public function getCredentials()
   {
       return '';
   }
}