<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery                           |
// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
// | Copyright (C) 2003-2005 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | branch        : BSF (Best So Far)
// | file          : $RCSfile$
// | last update   : $Date$
// | last modifier : $Author$
// | revision      : $Revision$
// +-----------------------------------------------------------------------+
// | 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                                          |
// |                                                                       |
// | 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.                                                                  |
// +-----------------------------------------------------------------------+

if (isset($conf['session_save_handler']) and ($conf['session_save_handler'] == 'db')) {
  session_set_save_handler('pwg_session_open', 
			   'pwg_session_close',
			   'pwg_session_read',
			   'pwg_session_write',
			   'pwg_session_destroy',
			   'pwg_session_gc'
			   );
}

ini_set('session.use_cookies', $conf['session_use_cookies']);
ini_set('session.use_only_cookies', $conf['session_use_only_cookies']);
ini_set('session.use_trans_sid', $conf['session_use_trans_sid']);
ini_set('session.name', $conf['session_name']);

function pwg_session_open($path, $name) 
{
  return true;
}

function pwg_session_close() 
{
  pwg_session_gc();
  return true;
}

function pwg_session_read($session_id) 
{
  $query = "SELECT data FROM " . SESSIONS_TABLE;
  $query .= " WHERE id = '$session_id'";
  $result = pwg_query($query);
  if ($result) {
    $row = mysql_fetch_assoc($result);
    return $row['data'];
  } else {
    return '';
  }
}

function pwg_session_write($session_id, $data) 
{
  $query = "SELECT id FROM " . SESSIONS_TABLE;
  $query .= " WHERE id = '$session_id'";
  $result = pwg_query($query);
  if (mysql_num_rows($result)) {
    $query = "UPDATE " . SESSIONS_TABLE . " SET expiration = now()";
    $query .= " WHERE id = '$session_id'";    
    pwg_query($query);
  } else {
    $query = "INSERT INTO " . SESSIONS_TABLE . " (id,data,expiration)";
    $query .= " VALUES('$session_id','$data',now())";
    pwg_query($query);    
  }
  return true;
}

function pwg_session_destroy($session_id) 
{
  $query = "DELETE FROM " . SESSIONS_TABLE;
  $query .= " WHERE id = '$session_id'";
  pwg_query($query);
  return true;
}

function pwg_session_gc() 
{
  global $conf;

  $query = "DELETE FROM " . SESSIONS_TABLE;
  $query .= " WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > " . $conf['session_length'];
  pwg_query($query);
  return true;
}
?>