mirror of
https://github.com/Piwigo/Piwigo.git
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git-svn-id: http://piwigo.org/svn/trunk@2357 68402e56-0260-453c-a942-63ccdbb3a9ee
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vdigital
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<?php
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// +-----------------------------------------------------------------------+
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// | Piwigo - a PHP based picture gallery |
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// +-----------------------------------------------------------------------+
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// | Copyright(C) 2008 Piwigo Team http://piwigo.org |
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// | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net |
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// | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick |
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// +-----------------------------------------------------------------------+
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// | This program is free software; you can redistribute it and/or modify |
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// | it under the terms of the GNU General Public License as published by |
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// | the Free Software Foundation |
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// | |
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// | This program is distributed in the hope that it will be useful, but |
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// | WITHOUT ANY WARRANTY; without even the implied warranty of |
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// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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// | General Public License for more details. |
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// | |
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// | You should have received a copy of the GNU General Public License |
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// | along with this program; if not, write to the Free Software |
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// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
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// | USA. |
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// +-----------------------------------------------------------------------+
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// The function generate_key creates a string with pseudo random characters.
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// the size of the string depends on the $conf['session_id_size'].
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// Characters used are a-z A-Z and numerical values. Examples :
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// "Er4Tgh6", "Rrp08P", "54gj"
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// input : none (using global variable)
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// output : $key
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function generate_key($size)
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{
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global $conf;
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$md5 = md5(substr(microtime(), 2, 6));
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$init = '';
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for ( $i = 0; $i < strlen( $md5 ); $i++ )
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{
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if ( is_numeric( $md5[$i] ) ) $init.= $md5[$i];
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}
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$init = substr( $init, 0, 8 );
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mt_srand( $init );
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$key = '';
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for ( $i = 0; $i < $size; $i++ )
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{
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$c = mt_rand( 0, 2 );
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if ( $c == 0 ) $key .= chr( mt_rand( 65, 90 ) );
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else if ( $c == 1 ) $key .= chr( mt_rand( 97, 122 ) );
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else $key .= mt_rand( 0, 9 );
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}
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return $key;
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}
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if (isset($conf['session_save_handler'])
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and ($conf['session_save_handler'] == 'db')
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and defined('PHPWG_INSTALLED'))
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{
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session_set_save_handler('pwg_session_open',
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'pwg_session_close',
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'pwg_session_read',
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'pwg_session_write',
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'pwg_session_destroy',
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'pwg_session_gc'
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);
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if ( function_exists('ini_set') )
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{
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ini_set('session.use_cookies', $conf['session_use_cookies']);
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ini_set('session.use_only_cookies', $conf['session_use_only_cookies']);
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ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid']));
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}
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session_name($conf['session_name']);
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session_set_cookie_params(0, cookie_path());
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}
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/**
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* returns true; used when the session_start() function is called
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*
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* @params not use but useful for php engine
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*/
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function pwg_session_open($path, $name)
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{
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return true;
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}
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/**
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* returns true; used when the session is closed (unset($_SESSION))
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*
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*/
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function pwg_session_close()
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{
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return true;
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}
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/**
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* this function returns
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* a string corresponding to the value of the variable save in the session
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* or an empty string when the variable doesn't exist
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*
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* @param string session id
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*/
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function pwg_session_read($session_id)
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{
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$query = '
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SELECT data
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FROM '.SESSIONS_TABLE.'
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WHERE id = \''.$session_id.'\'
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;';
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$result = pwg_query($query);
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if ($result)
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{
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$row = mysql_fetch_assoc($result);
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return $row['data'];
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}
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else
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{
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return '';
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}
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}
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/**
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* returns true; writes set a variable in the active session
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*
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* @param string session id
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* @data string value of date to be saved
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*/
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function pwg_session_write($session_id, $data)
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{
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$query = '
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UPDATE '.SESSIONS_TABLE.'
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SET expiration = now(),
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data = \''.$data.'\'
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WHERE id = \''.$session_id.'\'
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;';
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pwg_query($query);
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if ( mysql_affected_rows()>0 )
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{
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return true;
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}
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$query = '
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INSERT INTO '.SESSIONS_TABLE.'
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(id,data,expiration)
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VALUES(\''.$session_id.'\',\''.$data.'\',now())
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;';
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mysql_query($query);
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return true;
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}
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/**
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* returns true; delete the active session
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*
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* @param string session id
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*/
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function pwg_session_destroy($session_id)
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{
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$query = '
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DELETE
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FROM '.SESSIONS_TABLE.'
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WHERE id = \''.$session_id.'\'
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;';
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pwg_query($query);
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return true;
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}
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/**
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* returns true; delete expired sessions
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* called each time a session is closed.
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*/
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function pwg_session_gc()
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{
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global $conf;
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$query = '
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DELETE
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FROM '.SESSIONS_TABLE.'
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WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > '
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.$conf['session_length'].'
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;';
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pwg_query($query);
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return true;
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}
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/**
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* persistently stores a variable for the current session
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* currently we use standard php sessions but it might change
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* @return boolean true on success
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* @see pwg_get_session_var, pwg_unset_session_var
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*/
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function pwg_set_session_var($var, $value)
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{
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if ( !isset($_SESSION) )
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return false;
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$_SESSION['pwg_'.$var] = $value;
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return true;
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}
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/**
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* retrieves the value of a persistent variable for the current session
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* currently we use standard php sessions but it might change
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* @return mixed
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* @see pwg_set_session_var, pwg_unset_session_var
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*/
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function pwg_get_session_var($var, $default = null)
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{
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if (isset( $_SESSION['pwg_'.$var] ) )
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{
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return $_SESSION['pwg_'.$var];
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}
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return $default;
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}
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/**
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* deletes a persistent variable for the current session
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* currently we use standard php sessions but it might change
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* @return boolean true on success
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* @see pwg_set_session_var, pwg_get_session_var
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*/
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function pwg_unset_session_var($var)
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{
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if ( !isset($_SESSION) )
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return false;
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unset( $_SESSION['pwg_'.$var] );
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return true;
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}
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?>
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