<?php
/*
 * This code is part of GOsa (http://www.gosa-project.org)
 * Copyright (C) 2003-2008 GONICUS GmbH
 *
 * ID: $$Id$$
 *
 * 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; either version 2 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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

class session {

    public static function get_session_size()
    {

    }

    public static function get_element_size()
    {

    }

    public static function add_channel($name)
    {
        /* If there's already such kind of channel, skip... */
        if (isset($_SESSION[$name])){
            return (FALSE);
        }

        /* Allocate it... */
        $_SESSION[$name]= array();
        $_POST["_channel_"]= $name;
        return (TRUE);
    }

    public static function remove_channel($name)
    {
        /* If there's already such kind of channel, skip... */
        if (isset($_SESSION[$name])){
            unset($_SESSION[$name]);
            if (isset($_POST["_channel_"])){
                unset($_POST["_channel_"]);
            }
            return (TRUE);
        }

        return (FALSE);
    }

    public static function is_set($name)
    {
        $channel= "";
        if (isset($_POST['_channel_'])){
            $channel= $_POST['_channel_'];
        }

        /* Global fallback if not set */
        if ($channel == ""){
            return(isset($_SESSION[$name]));
        }

        /* Sanity check */
        if (!session::channel_exists($channel)){
            msg_dialog::display(_("Internal error"), _("Requested channel does not exist!"), FATAL_ERROR_DIALOG);
        }

        $channel= "gch_".$channel;
        return(isset($_SESSION[$channel][$name]));
    }

    public static function global_is_set($name)
    {
        return(isset($_SESSION[$name]));
    }

    public static function set($name,$value)
    {
        $channel= "";
        if (isset($_POST['_channel_'])){
            $channel= $_POST['_channel_'];
        }

        /* Global fallback if not set */
        if ($channel == ""){
            $_SESSION[$name] = $value;
        } else {
            /* Sanity check */
            if (!session::channel_exists($channel)){
                msg_dialog::display(_("Internal error"), _("Requested channel does not exist!"), FATAL_ERROR_DIALOG);
            }
            $_SESSION[$channel][$name] = $value;
        }
    }

    public static function global_set($name,$value)
    {
        $_SESSION[$name] = $value;
    }

    public static function &get($name)
    {
        $channel= "";
        if (isset($_POST['_channel_'])){
            $channel= $_POST['_channel_'];
        }

        /* Global fallback if not set */
        if ($channel == ""){
            $ret = &$_SESSION[$name];
            return($ret);
        }

        /* Sanity check */
        if (!session::channel_exists($channel)){
            msg_dialog::display(_("Internal error"), _("Requested channel does not exist!"), FATAL_ERROR_DIALOG);
        }

        $channel= "gch_".$channel;
        $ret = &$_SESSION[$channel][$name];
        return($ret);
    }

    public static function global_get($name)
    {
        return $_SESSION[$name];
    }

    public static function delete($name)
    {
        $channel= "";
        if (isset($_POST['_channel_'])){
            $channel= $_POST['_channel_'];
        }

        /* Global fallback if not set */
        if ($channel == ""){
            if(isset($_SESSION[$name])){
                unset($_SESSION[$name]);
            }
        } else {
            if(isset($_SESSION[$channel][$name])){
                unset($_SESSION[$channel][$name]);
            }
        }
    }

    public static function global_delete($name)
    {
        if($_SESSION[$name]){
            unset($_SESSION[$name]);
        }
    }

    public static function un_set($name)
    {
        return(session::delete($name));
    }

    public static function global_un_set($name)
    {
        return(session::global_delete($name));
    }

    public static function start()
    {
        /* Set cookie lifetime to one day (The parameter is in seconds ) */
        session_set_cookie_params(24*60*60);

        /* Set cache limter to one day (parameter is minute !!)*/
        session_cache_expire(60*24);  // default is 180

        /* Set session max lifetime, to prevent the garbage collector to delete session before timeout.
           !! The garbage collector is a cron job on debian systems, the cronjob will fetch the timeout from
           the php.ini, so if you use debian, you must hardcode session.gc_maxlifetime in your php.ini */
        ini_set("session.gc_maxlifetime",24*60*60);
        session_name("GOsa");
        session_start();

        /* Check for changed browsers and bail out */
        if (isset($_SESSION['HTTP_USER_AGENT']))
        {
            if ($_SESSION['HTTP_USER_AGENT'] !=  md5($_SERVER['HTTP_USER_AGENT'])) {
                session_destroy();
                session_name("GOsa");
                session_start();
            }
        } else {
            $_SESSION['HTTP_USER_AGENT'] = md5($_SERVER['HTTP_USER_AGENT']);
        }

        /* Regenerate ID to increase security */
        if (!isset($_SESSION['started'])){
            session_regenerate_id();
            $_SESSION['started'] = true;
        }
    }

    public static function destroy()
    {
        @session_destroy();
    }

    public static function set_lifetime($seconds = -1)
    {
        echo "Not implemented yet";
    }

    public static function &get_all()
    {
        $ret = &$_SESSION;
        return($ret);
    }
}

// vim:tabstop=2:expandtab:shiftwidth=2:filetype=php:syntax:ruler:
?>
