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<?php
/*
+-----------------------------------------------------------------------+
| program/include/session.inc |
| |
| This file is part of the RoundCube Webmail client |
| Copyright (C) 2005, RoundCube Dev, - Switzerland |
| All rights reserved. |
| |
| PURPOSE: |
| Provide database supported session management |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
$Id$
*/
function sess_open($save_path, $session_name)
{
return TRUE;
}
function sess_close()
{
return TRUE;
}
// read session data
function sess_read($key)
{
global $DB, $SESS_CHANGED;
$sql_result = $DB->query(sprintf("SELECT vars, UNIX_TIMESTAMP(changed) AS changed
FROM %s
WHERE sess_id='%s'",
get_table_name('session'),
$key));
if ($sql_arr = $DB->fetch_assoc($sql_result))
{
$SESS_CHANGED = $sql_arr['changed'];
if (strlen($sql_arr['vars']))
return $sql_arr['vars'];
}
return FALSE;
}
// save session data
function sess_write($key, $vars)
{
global $DB;
$sql_result = $DB->query(sprintf("SELECT 1
FROM %s
WHERE sess_id='%s'",
get_table_name('session'),
$key));
if ($DB->num_rows($sql_result))
{
session_decode($vars);
$DB->query(sprintf("UPDATE %s
SET vars='%s',
changed=NOW()
WHERE sess_id='%s'",
get_table_name('session'),
$vars,
$key));
}
else
{
$DB->query(sprintf("INSERT INTO %s
(sess_id, vars, created, changed)
VALUES ('%s', '%s', NOW(), NOW())",
get_table_name('session'),
$key,
$vars));
}
return TRUE;
}
// handler for session_destroy()
function sess_destroy($key)
{
global $DB;
$DB->query(sprintf("DELETE FROM %s
WHERE sess_id='%s'",
get_table_name('session'),
$key));
// also delete session entries in cache table
$DB->query(sprintf("DELETE FROM %s
WHERE session_id='%s'",
get_table_name('cache'),
$key));
return TRUE;
}
// garbage collecting function
function sess_gc($maxlifetime)
{
global $DB;
// get all expired sessions
$sql_result = $DB->query(sprintf("SELECT sess_id
FROM %s
WHERE UNIX_TIMESTAMP(NOW())-UNIX_TIMESTAMP(created) > %d",
get_table_name('session'),
$maxlifetime));
$a_exp_sessions = array();
while ($sql_arr = $DB->fetch_assoc($sql_result))
$a_exp_sessions[] = $sql_arr['sess_id'];
if (sizeof($a_exp_sessions))
{
// delete session records
$DB->query(sprintf("DELETE FROM %s
WHERE sess_id IN ('%s')",
get_table_name('session'),
join("','", $a_exp_sessions)));
// also delete session cache records
$DB->query(sprintf("DELETE FROM %s
WHERE session_id IN ('%s')",
get_table_name('cache'),
join("','", $a_exp_sessions)));
}
return TRUE;
}
// set custom functions for PHP session management
session_set_save_handler('sess_open', 'sess_close', 'sess_read', 'sess_write', 'sess_destroy', 'sess_gc');
?>
|
