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<?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. |
// +-----------------------------------------------------------------------+
// The function generate_key creates a string with pseudo random characters.
// the size of the string depends on the $conf['session_id_size'].
// Characters used are a-z A-Z and numerical values. Examples :
// "Er4Tgh6", "Rrp08P", "54gj"
// input : none (using global variable)
// output : $key
function generate_key($size)
{
global $conf;
$md5 = md5(substr(microtime(), 2, 6));
$init = '';
for ( $i = 0; $i < strlen( $md5 ); $i++ )
{
if ( is_numeric( $md5[$i] ) ) $init.= $md5[$i];
}
$init = substr( $init, 0, 8 );
mt_srand( $init );
$key = '';
for ( $i = 0; $i < $size; $i++ )
{
$c = mt_rand( 0, 2 );
if ( $c == 0 ) $key .= chr( mt_rand( 65, 90 ) );
else if ( $c == 1 ) $key .= chr( mt_rand( 97, 122 ) );
else $key .= mt_rand( 0, 9 );
}
return $key;
}
if (isset($conf['session_save_handler'])
and ($conf['session_save_handler'] == 'db')
and defined('PHPWG_INSTALLED'))
{
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', $conf['session_use_only_cookies']);
ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid']));
ini_set('session.name', $conf['session_name']);
ini_set('session.cookie_path', cookie_path() );
}
// cookie_path returns the path to use for the PhpWebGallery cookie.
// If PhpWebGallery is installed on :
// http://domain.org/meeting/gallery/category.php
// cookie_path will return : "/meeting/gallery"
function cookie_path()
{
if ( isset($_SERVER['REDIRECT_URL']) )
{ // mod_rewrite is activated for upper level directories. we must set the
// cookie to the path shown in the browser otherwise it will be discarded.
$scr = $_SERVER['REDIRECT_URL'];
}
else
{
$scr = $_SERVER['PHP_SELF'];
}
return substr($scr,0,strrpos( $scr,'/'));
}
/**
* returns true; used when the session_start() function is called
*
* @params not use but useful for php engine
*/
function pwg_session_open($path, $name)
{
return true;
}
/**
* returns true; used when the session is closed (unset($_SESSION))
*
*/
function pwg_session_close()
{
pwg_session_gc();
return true;
}
/**
* this function returns
* a string corresponding to the value of the variable save in the session
* or an empty string when the variable doesn't exist
*
* @param string session id
*/
function pwg_session_read($session_id)
{
$query = '
SELECT data
FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
$result = pwg_query($query);
if ($result)
{
$row = mysql_fetch_assoc($result);
return $row['data'];
}
else
{
return '';
}
}
/**
* returns true; writes set a variable in the active session
*
* @param string session id
* @data string value of date to be saved
*/
function pwg_session_write($session_id, $data)
{
$query = '
SELECT id
FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
$result = pwg_query($query);
if (mysql_num_rows($result))
{
$query = '
UPDATE '.SESSIONS_TABLE.'
SET expiration = now(),
data = \''.$data.'\'
WHERE id = \''.$session_id.'\'
;';
pwg_query($query);
}
else
{
$query = '
INSERT INTO '.SESSIONS_TABLE.'
(id,data,expiration)
VALUES(\''.$session_id.'\',\''.$data.'\',now())
;';
pwg_query($query);
}
return true;
}
/**
* returns true; delete the active session
*
* @param string session id
*/
function pwg_session_destroy($session_id)
{
$query = '
DELETE
FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
pwg_query($query);
return true;
}
/**
* returns true; delete expired sessions
* called each time a session is closed.
*/
function pwg_session_gc()
{
global $conf;
$query = '
DELETE
FROM '.SESSIONS_TABLE.'
WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > '
.$conf['session_length'].'
;';
pwg_query($query);
return true;
}
?>
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