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<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based picture gallery |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008 Piwigo Team http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | 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'
);
if ( function_exists('ini_set') )
{
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']));
}
session_name($conf['session_name']);
session_set_cookie_params(0, cookie_path());
}
/**
* returns true; used when the session_start() function is called
*
* @params not use but useful for php engine
*/
function pwg_session_open($path, $name)
{
return true;
}
/**
* returns true; used when the session is closed (unset($_SESSION))
*
*/
function pwg_session_close()
{
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)
{
$query = '
UPDATE '.SESSIONS_TABLE.'
SET expiration = now(),
data = \''.$data.'\'
WHERE id = \''.$session_id.'\'
;';
pwg_query($query);
if ( mysql_affected_rows()>0 )
{
return true;
}
$query = '
INSERT INTO '.SESSIONS_TABLE.'
(id,data,expiration)
VALUES(\''.$session_id.'\',\''.$data.'\',now())
;';
mysql_query($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($query);
return true;
}
/**
* persistently stores a variable for the current session
* currently we use standard php sessions but it might change
* @return boolean true on success
* @see pwg_get_session_var, pwg_unset_session_var
*/
function pwg_set_session_var($var, $value)
{
if ( !isset($_SESSION) )
return false;
$_SESSION['pwg_'.$var] = $value;
return true;
}
/**
* retrieves the value of a persistent variable for the current session
* currently we use standard php sessions but it might change
* @return mixed
* @see pwg_set_session_var, pwg_unset_session_var
*/
function pwg_get_session_var($var, $default = null)
{
if (isset( $_SESSION['pwg_'.$var] ) )
{
return $_SESSION['pwg_'.$var];
}
return $default;
}
/**
* deletes a persistent variable for the current session
* currently we use standard php sessions but it might change
* @return boolean true on success
* @see pwg_set_session_var, pwg_get_session_var
*/
function pwg_unset_session_var($var)
{
if ( !isset($_SESSION) )
return false;
unset( $_SESSION['pwg_'.$var] );
return true;
}
?>
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