trunk/gosa-core/include/class_session.inc

   1 <?php
   2 /*
   3  * This code is part of GOsa (http://www.gosa-project.org)
   4  * Copyright (C) 2003-2008 GONICUS GmbH
   5  *
   6  * ID: $$Id$$
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 class session {
  24
  25         public static function get_session_size()
  26         {
  27
  28         }
  29
  30         public static function get_element_size()
  31         {
  32
  33         }
  34
  35         public static function add_channel($name)
  36         {
  37                 /* If there's already such kind of channel, skip... */
  38                 if (isset($_SESSION[$name])){
  39                         return (FALSE);
  40                 }
  41
  42                 /* Allocate it... */
  43                 $_SESSION[$name]= array();
  44                 $_POST["_channel_"]= $name;
  45                 return (TRUE);
  46         }
  47
  48         public static function remove_channel($name)
  49         {
  50                 /* If there's already such kind of channel, skip... */
  51                 if (isset($_SESSION[$name])){
  52                         unset($_SESSION[$name]);
  53                         if (isset($_POST["_channel_"])){
  54                                 unset($_POST["_channel_"]);
  55                         }
  56                         return (TRUE);
  57                 }
  58
  59                 return (FALSE);
  60         }
  61
  62         public static function is_set($name)
  63         {
  64                 $channel= "";
  65                 if (isset($_POST['_channel_'])){
  66                         $channel= $_POST['_channel_'];
  67                 }
  68
  69                 /* Global fallback if not set */
  70                 if ($channel == ""){
  71                         return(isset($_SESSION[$name]));
  72                 }
  73
  74                 /* Sanity check */
  75                 if (!session::channel_exists($channel)){
  76                         msg_dialog::display(_("Internal error"), _("Requested channel does not exist! Please contact your Administrator."), FATAL_ERROR_DIALOG);
  77                 }
  78
  79                 $channel= "gch_".$channel;
  80                 return(isset($_SESSION[$channel][$name]));
  81         }
  82
  83         public static function global_is_set($name)
  84         {
  85                 return(isset($_SESSION[$name]));
  86         }
  87
  88         public static function set($name,$value)
  89         {
  90                 $channel= "";
  91                 if (isset($_POST['_channel_'])){
  92                         $channel= $_POST['_channel_'];
  93                 }
  94
  95                 /* Global fallback if not set */
  96                 if ($channel == ""){
  97                         $_SESSION[$name] = $value;
  98                 } else {
  99                         /* Sanity check */
 100                         if (!session::channel_exists($channel)){
 101                                 msg_dialog::display(_("Internal error"), _("Requested channel does not exist! Please contact your Administrator."), FATAL_ERROR_DIALOG);
 102                         }
 103                         $_SESSION[$channel][$name] = $value;
 104                 }
 105         }
 106
 107         public static function global_set($name,$value)
 108         {
 109                 $_SESSION[$name] = $value;
 110         }
 111
 112         public static function &get($name)
 113         {
 114                 $channel= "";
 115                 if (isset($_POST['_channel_'])){
 116                         $channel= $_POST['_channel_'];
 117                 }
 118
 119                 /* Global fallback if not set */
 120                 if ($channel == ""){
 121                         $ret = &$_SESSION[$name];
 122                         return($ret);
 123                 }
 124
 125                 /* Sanity check */
 126                 if (!session::channel_exists($channel)){
 127                         msg_dialog::display(_("Internal error"), _("Requested channel does not exist! Please contact your Administrator."), FATAL_ERROR_DIALOG);
 128                 }
 129
 130                 $channel= "gch_".$channel;
 131                 $ret = &$_SESSION[$channel][$name];
 132                 return($ret);
 133         }
 134
 135         public static function &global_get($name)
 136         {
 137                 $ret = &$_SESSION[$name];
 138                 return($ret);
 139         }
 140
 141         public static function delete($name)
 142         {
 143                 $channel= "";
 144                 if (isset($_POST['_channel_'])){
 145                         $channel= $_POST['_channel_'];
 146                 }
 147
 148                 /* Global fallback if not set */
 149                 if ($channel == ""){
 150                         if(isset($_SESSION[$name])){
 151                                 unset($_SESSION[$name]);
 152                         }
 153                 } else {
 154                         if(isset($_SESSION[$channel][$name])){
 155                                 unset($_SESSION[$channel][$name]);
 156                         }
 157                 }
 158         }
 159
 160         public static function global_delete($name)
 161         {
 162                 if($_SESSION[$name]){
 163                         unset($_SESSION[$name]);
 164                 }
 165         }
 166
 167         public static function un_set($name)
 168         {
 169                 return(session::delete($name));
 170         }
 171
 172         public static function global_un_set($name)
 173         {
 174                 return(session::global_delete($name));
 175         }
 176
 177         public static function start()
 178         {
 179                 /* Set cookie lifetime to one day (The parameter is in seconds ) */
 180                 session_set_cookie_params(24*60*60);
 181
 182                 /* Set cache limter to one day (parameter is minute !!)*/
 183                 session_cache_expire(60*24);  // default is 180
 184
 185                 /* Set session max lifetime, to prevent the garbage collector to delete session before timeout.
 186                    !! The garbage collector is a cron job on debian systems, the cronjob will fetch the timeout from
 187                    the php.ini, so if you use debian, you must hardcode session.gc_maxlifetime in your php.ini */
 188                 ini_set("session.gc_maxlifetime",24*60*60);
 189                 session_start();
 190
 191                 /* Check for changed browsers and bail out */
 192                 if (isset($_SESSION['HTTP_USER_AGENT']))
 193                 {
 194                         if ($_SESSION['HTTP_USER_AGENT'] !=  md5($_SERVER['HTTP_USER_AGENT'])) {
 195                                 session_destroy();
 196                                 session_start();
 197                         }
 198                 } else {
 199                         $_SESSION['HTTP_USER_AGENT'] = md5($_SERVER['HTTP_USER_AGENT']);
 200                 }
 201
 202                 /* Regenerate ID to increase security */
 203                 if (!isset($_SESSION['started'])){
 204                         session_regenerate_id();
 205                         $_SESSION['started'] = true;
 206                 }
 207         }
 208
 209         public static function destroy()
 210         {
 211                 @session_destroy();
 212         }
 213
 214         public static function set_lifetime($seconds = -1)
 215         {
 216                 echo "Not implemented yet";
 217         }
 218
 219         public static function &get_all()
 220         {
 221                 $ret = &$_SESSION;
 222                 return($ret);
 223         }
 224 }
 225
 226 // vim:tabstop=2:expandtab:shiftwidth=2:filetype=php:syntax:ruler:
 227 ?>