session.php
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<?php
/*
Copyright (c) 2009-2014 F3::Factory/Bong Cosca, All rights reserved.
This file is part of the Fat-Free Framework (http://fatfree.sf.net).
THE SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
PURPOSE.
Please see the license.txt file for more information.
*/
//! Cache-based session handler
class Session {
protected
//! Session ID
$sid;
/**
* Open session
* @return TRUE
* @param $path string
* @param $name string
**/
function open($path,$name) {
return TRUE;
}
/**
* Close session
* @return TRUE
**/
function close() {
return TRUE;
}
/**
* Return session data in serialized format
* @return string|FALSE
* @param $id string
**/
function read($id) {
if ($id!=$this->sid)
$this->sid=$id;
return Cache::instance()->exists($id.'.@',$data)?$data['data']:FALSE;
}
/**
* Write session data
* @return TRUE
* @param $id string
* @param $data string
**/
function write($id,$data) {
$fw=Base::instance();
$sent=headers_sent();
$headers=$fw->get('HEADERS');
$csrf=$fw->hash($fw->get('ROOT').$fw->get('BASE')).'.'.
$fw->hash(mt_rand());
$jar=$fw->get('JAR');
if ($id!=$this->sid)
$this->sid=$id;
Cache::instance()->set($id.'.@',
array(
'data'=>$data,
'csrf'=>$sent?$this->csrf():$csrf,
'ip'=>$fw->get('IP'),
'agent'=>isset($headers['User-Agent'])?
$headers['User-Agent']:'',
'stamp'=>time()
),
$jar['expire']?($jar['expire']-time()):0
);
return TRUE;
}
/**
* Destroy session
* @return TRUE
* @param $id string
**/
function destroy($id) {
Cache::instance()->clear($id.'.@');
setcookie(session_name(),'',strtotime('-1 year'));
unset($_COOKIE[session_name()]);
header_remove('Set-Cookie');
return TRUE;
}
/**
* Garbage collector
* @return TRUE
* @param $max int
**/
function cleanup($max) {
Cache::instance()->reset('.@',$max);
return TRUE;
}
/**
* Return anti-CSRF token
* @return string|FALSE
**/
function csrf() {
return Cache::instance()->
exists(($this->sid?:session_id()).'.@',$data)?
$data['csrf']:FALSE;
}
/**
* Return IP address
* @return string|FALSE
**/
function ip() {
return Cache::instance()->
exists(($this->sid?:session_id()).'.@',$data)?
$data['ip']:FALSE;
}
/**
* Return Unix timestamp
* @return string|FALSE
**/
function stamp() {
return Cache::instance()->
exists(($this->sid?:session_id()).'.@',$data)?
$data['stamp']:FALSE;
}
/**
* Return HTTP user agent
* @return string|FALSE
**/
function agent() {
return Cache::instance()->
exists(($this->sid?:session_id()).'.@',$data)?
$data['agent']:FALSE;
}
/**
* Instantiate class
* @return object
**/
function __construct() {
session_set_save_handler(
array($this,'open'),
array($this,'close'),
array($this,'read'),
array($this,'write'),
array($this,'destroy'),
array($this,'cleanup')
);
register_shutdown_function('session_commit');
@session_start();
$fw=\Base::instance();
$headers=$fw->get('HEADERS');
if (($ip=$this->ip()) && $ip!=$fw->get('IP') ||
($agent=$this->agent()) &&
(!isset($headers['User-Agent']) ||
$agent!=$headers['User-Agent'])) {
session_destroy();
\Base::instance()->error(403);
}
$csrf=$fw->hash($fw->get('ROOT').$fw->get('BASE')).'.'.
$fw->hash(mt_rand());
$jar=$fw->get('JAR');
if (Cache::instance()->exists(($this->sid=session_id()).'.@',$data)) {
$data['csrf']=$csrf;
Cache::instance()->set($this->sid.'.@',
$data,
$jar['expire']?($jar['expire']-time()):0
);
}
}
}