<?php

/*

 * Copyright 2010 Johannes M. Schmitt <schmittjoh@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

namespace JMS\SecurityExtraBundle\Security\Authentication\Provider;

use Symfony\Component\Security\Core\Exception\BadCredentialsException;

use JMS\SecurityExtraBundle\Security\Authentication\Token\RunAsUserToken;

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

use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;

/**

 * Class which authenticates RunAsTokens.

 *

 * @author Johannes M. Schmitt <schmittjoh@gmail.com>

 */

class RunAsAuthenticationProvider implements AuthenticationProviderInterface

{

    private $key;

    public function __construct($key)

    {

        $this->key = $key;

    }

    public function authenticate(TokenInterface $token)

    {

        if (!$this->supports($token)) {

            return null;

        }

        if ($token->getKey() === $this->key) {

            return $token;

        } else {

            throw new BadCredentialsException('The keys do not match.');

        }

    }

    public function supports(TokenInterface $token)

    {

        return $token instanceof RunAsUserToken;

    }

}