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<?php
/**
* SessionHandler implementation for LDAP directories.
*
* Required parameters:<pre>
* 'foo' The foo.
*
* Optional parameters:<pre>
* 'hostspec' The hostname of the ldap server.
*
* $Horde: framework/SessionHandler/SessionHandler/ldap.php,v 1.2.2.2 2005/10/18 11:01:27 jan Exp $
*
* This code is adapted from the comments at
* http://www.php.net/session-set-save-handler.
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @since Horde 3.1
* @package Horde_SessionHandler
*/
class SessionHandler_ldap extends SessionHandler {
/**
* Handle for the current database connection.
*
* @var resource
*/
var $_conn;
/**
* Open the SessionHandler backend.
*
* @param string $save_path The path to the session object.
* @param string $session_name The name of the session.
*
* @return boolean True on success, false otherwise.
*/
function open($save_path, $session_name)
{
$this->_conn = @ldap_connect($this->_params['hostspec'], $this->_params['port']);
return @ldap_bind($this->_conn, $this->_params['dn'], $this->_params['password']);
}
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*/
function close()
{
return @ldap_close($this->_conn);
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*/
function read($id)
{
$sr = @ldap_search($this->_conn, $this->_params['dn'], "(cn=$id)");
$info = @ldap_get_entries($this->_conn, $sr);
if ($info['count'] > 0) {
return $info[0]['session'][0];
} else {
return '';
}
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*/
function write($id, $session_data)
{
$update = array('objectClass' => array('phpsession', 'top'),
'session' => $session_data);
$dn = "cn=$id," . $this->_params['dn'];
@ldap_delete($this->_conn, $dn);
return @ldap_add($this->_conn, $dn, $update);
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*/
function destroy($id)
{
$dn = "cn=$id," . $this->_params['dn'];
return @ldap_delete($this->_conn, $dn);
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $maxlifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*/
function gc($maxlifetime = 300)
{
$sr = @ldap_search($this->_conn, $this->_params['dn'],
'(objectClass=phpsession)', array('+', 'cn'));
$info = @ldap_get_entries($this->_conn, $sr);
if ($info['count'] > 0) {
for ($i = 0; $i < $info['count']; $i++) {
$id = $info[$i]['cn'][0];
$dn = "cn=$id," . $this->_params['dn'];
$ldapstamp = $info[$i]['modifytimestamp'][0];
$year = substr($ldapstamp, 0, 4);
$month = substr($ldapstamp, 4, 2);
$day = substr($ldapstamp, 6, 2);
$hour = substr($ldapstamp, 8, 2);
$minute = substr($ldapstamp, 10, 2);
$modified = gmmktime($hour, $minute, 0, $month, $day, $year);
if (time() - $modified >= $maxlifetime) {
@ldap_delete($this->_conn, $dn);
}
}
}
return true;
}
}
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