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session.inc
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session.inc
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/session.inc |
| |
| This file is part of the RoundCube Webmail client |
| Copyright (C) 2005-2009, RoundCube Dev. - Switzerland |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| Provide database supported session management |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
$Id$
*/
$GLOBALS['rcube_session_unsets'] = array();
function rcube_sess_open($save_path, $session_name)
{
return true;
}
function rcube_sess_close()
{
return true;
}
// read session data
function rcube_sess_read($key)
{
global $SESS_CHANGED, $SESS_CLIENT_IP;
$DB = rcmail::get_instance()->get_dbh();
$sql_result = $DB->query(
"SELECT vars, ip, " . $DB->unixtimestamp('changed') . " AS changed
FROM " . get_table_name('session') . "
WHERE sess_id=?",
$key);
if ($sql_arr = $DB->fetch_assoc($sql_result)) {
$SESS_CHANGED = $sql_arr['changed'];
$SESS_CLIENT_IP = $sql_arr['ip'];
if (strlen($sql_arr['vars']))
return $sql_arr['vars'];
}
return false;
}
// save session data
function rcube_sess_write($key, $vars)
{
$DB = rcmail::get_instance()->get_dbh();
$now = $DB->fromunixtime(time());
$sql_result = $DB->query(
"SELECT vars FROM " . get_table_name('session') . "
WHERE sess_id=?", $key);
if ($sql_arr = $DB->fetch_assoc($sql_result)) {
$a_oldvars = rcube_sess_unserialize($sql_arr['vars']);
foreach ((array)$GLOBALS['rcube_session_unsets'] as $k)
unset($a_oldvars[$k]);
$DB->query(
"UPDATE " . get_table_name('session') . "
SET vars=?, changed= " . $now . "
WHERE sess_id=?",
rcube_sess_serialize(array_merge($a_oldvars, rcube_sess_unserialize($vars))),
$key);
}
else {
$DB->query(
"INSERT INTO " . get_table_name('session') . "
(sess_id, vars, ip, created, changed)
VALUES (?, ?, ?, " . $now . ", " . $now .")",
$key,
$vars,
(string)$_SERVER['REMOTE_ADDR']);
}
$GLOBALS['rcube_session_unsets'] = array();
return true;
}
// unset session variable
function rcube_sess_unset($var=NULL)
{
if (empty($var))
return rcube_sess_destroy(session_id());
$GLOBALS['rcube_session_unsets'][] = $var;
unset($_SESSION[$var]);
return true;
}
// serialize session data
function rcube_sess_serialize($vars)
{
$data = '';
if (is_array($vars))
foreach ($vars as $var=>$value)
$data .= $var.'|'.serialize($value);
else
$data = 'b:0;';
return $data;
}
// unserialize session data
// http://www.php.net/manual/en/function.session-decode.php#56106
function rcube_sess_unserialize($str)
{
$str = (string)$str;
$endptr = strlen($str);
$p = 0;
$serialized = '';
$items = 0;
$level = 0;
while ($p < $endptr) {
$q = $p;
while ($str[$q] != '|')
if (++$q >= $endptr) break 2;
if ($str[$p] == '!') {
$p++;
$has_value = false;
} else {
$has_value = true;
}
$name = substr($str, $p, $q - $p);
$q++;
$serialized .= 's:' . strlen($name) . ':"' . $name . '";';
if ($has_value) {
for (;;) {
$p = $q;
switch (strtolower($str[$q])) {
case 'n': /* null */
case 'b': /* boolean */
case 'i': /* integer */
case 'd': /* decimal */
do $q++;
while ( ($q < $endptr) && ($str[$q] != ';') );
$q++;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'r': /* reference */
$q+= 2;
for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q];
$q++;
$serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */
if ($level == 0) break 2;
break;
case 's': /* string */
$q+=2;
for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q];
$q+=2;
$q+= (int)$length + 2;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'a': /* array */
case 'o': /* object */
do $q++;
while ( ($q < $endptr) && ($str[$q] != '{') );
$q++;
$level++;
$serialized .= substr($str, $p, $q - $p);
break;
case '}': /* end of array|object */
$q++;
$serialized .= substr($str, $p, $q - $p);
if (--$level == 0) break 2;
break;
default:
return false;
}
}
} else {
$serialized .= 'N;';
$q+= 2;
}
$items++;
$p = $q;
}
return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
}
// handler for session_destroy()
function rcube_sess_destroy($key)
{
$DB = rcmail::get_instance()->get_dbh();
$DB->query("DELETE FROM " . get_table_name('session') . " WHERE sess_id=?", $key);
return true;
}
// garbage collecting function
function rcube_sess_gc($maxlifetime)
{
$rcmail = rcmail::get_instance();
$DB = $rcmail->get_dbh();
// just delete all expired sessions
$DB->query("DELETE FROM " . get_table_name('session') . "
WHERE changed < " . $DB->fromunixtime(time() - $maxlifetime));
if ($rcmail->config->get('enable_caching'))
rcmail_cache_gc();
rcmail_temp_gc();
return true;
}
function rcube_sess_regenerate_id()
{
$randval = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
for ($random = "", $i=1; $i <= 32; $i++) {
$random .= substr($randval, mt_rand(0,(strlen($randval) - 1)), 1);
}
// use md5 value for id or remove capitals from string $randval
$random = md5($random);
// delete old session record
rcube_sess_destroy(session_id());
session_id($random);
$cookie = session_get_cookie_params();
$lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0;
rcmail::setcookie(session_name(), $random, $lifetime);
return true;
}
// set custom functions for PHP session management
session_set_save_handler('rcube_sess_open', 'rcube_sess_close', 'rcube_sess_read', 'rcube_sess_write', 'rcube_sess_destroy', 'rcube_sess_gc');
?>

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