muzich/vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Security/EmailUserProvider.php

<?php

/*
 * This file is part of the FOSUserBundle package.
 *
 * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace FOS\UserBundle\Security;

class EmailUserProvider extends UserProvider
{
    /**
     * {@inheritDoc}
     */
    protected function findUser($username)
    {
        return $this->userManager->findUserByUsernameOrEmail($username);
    }
}