BaseOAuthClientBundle/Controller/OAuthController.php

<?php

namespace Base\OAuthClientBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;

class OAuthController extends Controller
{

    /**
     * @Route("/login_check", name="login_check")
     * @param Request $request
     * @return type
     */
    public function loginCheckAction(Request $request)
    {
        return $this->redirect($this->generateUrl('sonata_admin_dashboard'));
    }

}