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<?php
// +-----------------------------------------------------------------------+
// | functions_session.inc.php |
// +-----------------------------------------------------------------------+
// | application : PhpWebGallery <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 $key;
}
/**
* create a new session and returns the session identifier
*
* - find a non-already-used session key
* - create a session in database
* - return session identifier
*
* @param int userid
* @param int session_lentgh : in seconds
* @return string
*/
function session_create($userid, $session_length)
{
global $conf;
// 1. searching an unused session key
$id_found = false;
while (!$id_found)
{
$generated_id = generate_key($conf['session_id_size']);
$query = '
SELECT id
FROM '.SESSIONS_TABLE.'
WHERE id = \''.$generated_id.'\'
;';
$result = mysql_query($query);
if (mysql_num_rows($result) == 0)
{
$id_found = true;
}
}
// 3. inserting session in database
$expiration = $session_length + time();
$query = '
INSERT INTO '.SESSIONS_TABLE.'
(id,user_id,expiration,ip)
VALUES
(\''.$generated_id.'\','.$userid.','.$expiration.',
\''.$_SERVER['REMOTE_ADDR'].'\')
;';
mysql_query($query);
setcookie('id', $generated_id, $expiration, cookie_path());
return $generated_id;
}
// add_session_id adds the id of the session to the string given in
// parameter as $url. If the session id is the first parameter to the url,
// it is preceded by a '?', else it is preceded by a '&'. If the
// parameter $redirect is set to true, '&' is used instead of '&'.
function add_session_id( $url, $redirect = false )
{
global $page, $user;
if ( $user['has_cookie'] ) return $url;
$amp = '&';
if ( $redirect )
{
$amp = '&';
}
if ( !$user['is_the_guest'] )
{
if ( preg_match( '/\.php\?/',$url ) )
{
return $url.$amp.'id='.$page['session_id'];
}
else
{
return $url.'?id='.$page['session_id'];
}
}
else
{
return $url;
}
}
// cookie_path returns the path to use for the PhpWebGallery cookie.
// If PhpWebGallery is installed on :
// http://domain.org/meeting/gallery/category.php
// cookie_path will return : "/meeting/gallery"
function cookie_path()
{
return substr($_SERVER['PHP_SELF'],0,strrpos( $_SERVER['PHP_SELF'],'/'));
}
?>
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