external-account/Security/Core/User/TemporaryUserProvider.php

<?php
/**
 * Authserver, an OAuth2-based single-signon authentication provider written in PHP.
 *
 * Copyright (C) $today.date  Lars Vierbergen
 *
 * his program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
namespace vierbergenlars\AuthserverExternalAccountBundle\Security\Core\User;

use Symfony\Component\Security\Core\User\UserProviderInterface;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
use vierbergenlars\AuthserverExternalAccountBundle\Entity\TemporaryUser;
use Symfony\Component\Security\Core\Exception\UnsupportedUserException;

class TemporaryUserProvider implements UserProviderInterface
{

    public function supportsClass($class)
    {
        return is_subclass_of($class, TemporaryUser::class);
    }

    public function refreshUser(UserInterface $user)
    {
        if (!$this->supportsClass(get_class($user)))
            throw new UnsupportedUserException(sprintf('Expected instance of %s, got instance of %s', TemporaryUser::class, get_class($user)));
        return $user;
    }

    public function loadUserByUsername($username)
    {
        throw new UsernameNotFoundException();
    }
}