<?php

/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2014 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 *
 */

namespace oat\taoLti\controller;

use common_Logger;
use tao_actions_CommonModule;

/**
 * A controller to bypass some restrictions on cookies
 *
 * @author Joel Bout <joel@taotesting.com>
 * @package taoLti

 */
class CookieUtils extends tao_actions_CommonModule
{
    /**
     * Verifies whenever or not the cookie was set correctly
     * Redirects the user to his destination if it was
     * or prompts the user to restore the session if it wasn't
     */
    public function verifyCookie()
    {
        $url = $this->getRequestParameter('redirect');
        $url = rawurldecode($url);
        $session = $this->getRequestParameter('session');
        if (session_id() == $session) {
            $this->forwardUrl($url);
        } else {
            $this->setData('session', $session);
            $this->setData('redirect', $url);
            $this->setView('cookieError.tpl');
        }
    }

    /**
     * Closses the current session, restores the session provided
     * in the parameter session, regenerates a new sessionid and
     * redirects the user to the original address
     * @throws \common_Exception
     */
    public function restoreSession()
    {
        $sessId = $this->getRequestParameter('session');
        $url = $this->getRequestParameter('redirect');
        if (session_id() != $sessId) {
            common_Logger::i('Changing session to ' . $sessId);
            session_unset();
            session_destroy();
            
            session_id($sessId);
            session_start();
            if (session_id() != $sessId) {
                $this->returnError(__('Unable to restore Session'));
            }
            session_regenerate_id(true);
            common_Logger::d('regenerated session to id \'' . session_id() . '\'');
        } else {
            common_Logger::w('Restore session called with correct session id \'' . session_id() . '\'');
        }
        $this->forwardUrl($url);
    }
}