<?php

/*

 * This file is part of the Symfony framework.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * This source file is subject to the MIT license that is bundled

 * with this source code in the file LICENSE.

 */

namespace Symfony\Component\Security\Http\Session;

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

use Symfony\Component\HttpFoundation\Request;

/**

 * The default session strategy implementation.

 *

 * Supports the following strategies:

 * NONE: the session is not changed

 * MIGRATE: the session id is updated, attributes are kept

 * INVALIDATE: the session id is updated, attributes are lost

 *

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

 */

class SessionAuthenticationStrategy implements SessionAuthenticationStrategyInterface

{

    const NONE         = 'none';

    const MIGRATE      = 'migrate';

    const INVALIDATE   = 'invalidate';

    private $strategy;

    public function __construct($strategy)

    {

        $this->strategy = $strategy;

    }

    /**

     * {@inheritDoc}

     */

    public function onAuthentication(Request $request, TokenInterface $token)

    {

        switch ($this->strategy) {

            case self::NONE:

                return;

            case self::MIGRATE:

                $request->getSession()->migrate();

                return;

            case self::INVALIDATE:

                $request->getSession()->invalidate();

                return;

            default:

                throw new \RuntimeException(sprintf('Invalid session authentication strategy "%s"', $this->strategy));

        }

    }

}