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rcube_session.php
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rcube_session.php
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_session.php |
| |
| This file is part of the RoundCube Webmail client |
| Copyright (C) 2005-2010, RoundCube Dev. - Switzerland |
| Licensed under the GNU GPL |
| |
| PURPOSE: |
| Provide database supported session management |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
$Id: session.inc 2932 2009-09-07 12:51:21Z alec $
*/
/**
* Class to provide database supported session storage
*
* @package Core
* @author Thomas Bruederli <roundcube@gmail.com>
* @author Aleksander Machniak <alec@alec.pl>
*/
class rcube_session
{
private $db;
private $ip;
private $changed;
private $unsets = array();
private $gc_handlers = array();
private $start;
private $vars = false;
private $key;
private $keep_alive = 0;
/**
* Default constructor
*/
public function __construct($db, $lifetime=60)
{
$this->db = $db;
$this->lifetime = $lifetime;
$this->start = microtime(true);
// set custom functions for PHP session management
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc'));
}
public function open($save_path, $session_name)
{
return true;
}
public function close()
{
return true;
}
// read session data
public function read($key)
{
$sql_result = $this->db->query(
sprintf("SELECT vars, ip, %s AS changed FROM %s WHERE sess_id = ?",
$this->db->unixtimestamp('changed'), get_table_name('session')),
$key);
if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
$this->changed = $sql_arr['changed'];
$this->vars = $sql_arr['vars'];
$this->ip = $sql_arr['ip'];
$this->key = $key;
if (!empty($sql_arr['vars']))
return $sql_arr['vars'];
}
return false;
}
// save session data
public function write($key, $vars)
{
$ts = microtime(true);
$now = $this->db->fromunixtime((int)$ts);
// use internal data from read() for fast requests (up to 0.5 sec.)
if ($key == $this->key && $ts - $this->start < 0.5) {
$oldvars = $this->vars;
} else { // else read data again from DB
$oldvars = $this->read($key);
}
if ($oldvars !== false) {
$a_oldvars = $this->unserialize($oldvars);
foreach ((array)$this->unsets as $k)
unset($a_oldvars[$k]);
$newvars = $this->serialize(array_merge(
(array)$a_oldvars, (array)$this->unserialize($vars)));
if ($this->keep_alive>0) {
$timeout = min($this->lifetime * 0.5,
$this->lifetime - $this->keep_alive);
} else {
$timeout = 0;
}
if (!($newvars === $oldvars) || ($ts - $this->changed > $timeout)) {
$this->db->query(
sprintf("UPDATE %s SET vars = ?, changed = %s WHERE sess_id = ?",
get_table_name('session'), $now),
$newvars, $key);
}
}
else {
$this->db->query(
sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
"VALUES (?, ?, ?, %s, %s)",
get_table_name('session'), $now, $now),
$key, $vars, (string)$_SERVER['REMOTE_ADDR']);
}
$this->unsets = array();
return true;
}
// handler for session_destroy()
public function destroy($key)
{
$this->db->query(
sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')),
$key);
return true;
}
// garbage collecting function
public function gc($maxlifetime)
{
// just delete all expired sessions
$this->db->query(
sprintf("DELETE FROM %s WHERE changed < %s",
get_table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
foreach ($this->gc_handlers as $fct)
$fct();
return true;
}
// registering additional garbage collector functions
public function register_gc_handler($func_name)
{
if ($func_name && !in_array($func_name, $this->gc_handlers))
$this->gc_handlers[] = $func_name;
}
public function 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
$this->destroy(session_id());
session_id($random);
$cookie = session_get_cookie_params();
$lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0;
rcmail::setcookie(session_name(), $random, $lifetime);
return true;
}
// unset session variable
public function remove($var=NULL)
{
if (empty($var))
return $this->destroy(session_id());
$this->unsets[] = $var;
unset($_SESSION[$var]);
return true;
}
// serialize session data
private function serialize($vars)
{
$data = '';
if (is_array($vars))
foreach ($vars as $var=>$value)
$data .= $var.'|'.serialize($value);
else
$data = 'b:0;';
return $data;
}
// unserialize session data
// http://www.php.net/manual/en/function.session-decode.php#56106
private function unserialize($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 . ':{' . $serialized . '}' );
}
public function set_keep_alive($keep_alive)
{
$this->keep_alive = $keep_alive;
}
public function get_keep_alive()
{
return $this->keep_alive;
}
// getter for private variables
public function get_ts()
{
return $this->changed;
}
// getter for private variables
public function get_ip()
{
return $this->ip;
}
}

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