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<?php
/**
* Slim - a micro PHP 5 framework
*
* @author Josh Lockhart <info@slimframework.com>
* @copyright 2011 Josh Lockhart
* @link http://www.slimframework.com
* @license http://www.slimframework.com/license
* @version 2.0.0
* @package Slim
*
* MIT LICENSE
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
namespace Slim\Middleware;
/**
* Session Cookie
*
* This class provides an HTTP cookie storage mechanism
* for session data. This class avoids using a PHP session
* and instead serializes/unserializes the $_SESSION global
* variable to/from an HTTP cookie.
*
* If a secret key is provided with this middleware, the HTTP
* cookie will be checked for integrity to ensure the client-side
* cookie is not changed.
*
* You should NEVER store sensitive data in a client-side cookie
* in any format, encrypted or not. If you need to store sensitive
* user information in a session, you should rely on PHP's native
* session implementation, or use other middleware to store
* session data in a database or alternative server-side cache.
*
* Because this class stores serialized session data in an HTTP cookie,
* you are inherently limtied to 4 Kb. If you attempt to store
* more than this amount, serialization will fail.
*
* @package Slim
* @author Josh Lockhart
* @since 1.6.0
*/
class SessionCookie extends \Slim\Middleware
{
/**
* @var array
*/
protected $settings;
/**
* Constructor
*
* @param array $settings
*/
public function __construct($settings = array())
{
$this->settings = array_merge(array(
'expires' => '20 minutes',
'path' => '/',
'domain' => null,
'secure' => false,
'httponly' => false,
'name' => 'slim_session',
'secret' => 'CHANGE_ME',
'cipher' => MCRYPT_RIJNDAEL_256,
'cipher_mode' => MCRYPT_MODE_CBC
), $settings);
if (is_string($this->settings['expires'])) {
$this->settings['expires'] = strtotime($this->settings['expires']);
}
/**
* Session
*
* We must start a native PHP session to initialize the $_SESSION superglobal.
* However, we won't be using the native session store for persistence, so we
* disable the session cookie and cache limiter. We also set the session
* handler to this class instance to avoid PHP's native session file locking.
*/
ini_set('session.use_cookies', 0);
session_cache_limiter(false);
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc')
);
}
/**
* Call
*/
public function call()
{
$this->loadSession();
$this->next->call();
$this->saveSession();
}
/**
* Load session
* @param array $env
*/
protected function loadSession()
{
if (session_id() === '') {
session_start();
}
$value = \Slim\Http\Util::decodeSecureCookie(
$this->app->request()->cookies($this->settings['name']),
$this->settings['secret'],
$this->settings['cipher'],
$this->settings['cipher_mode']
);
if ($value) {
$_SESSION = unserialize($value);
} else {
$_SESSION = array();
}
}
/**
* Save session
*/
protected function saveSession()
{
$value = \Slim\Http\Util::encodeSecureCookie(
serialize($_SESSION),
$this->settings['expires'],
$this->settings['secret'],
$this->settings['cipher'],
$this->settings['cipher_mode']
);
if (strlen($value) > 4096) {
$this->app->getLog()->error('WARNING! Slim\Middleware\SessionCookie data size is larger than 4KB. Content save failed.');
} else {
$this->app->response()->setCookie($this->settings['name'], array(
'value' => $value,
'domain' => $this->settings['domain'],
'path' => $this->settings['path'],
'expires' => $this->settings['expires'],
'secure' => $this->settings['secure'],
'httponly' => $this->settings['httponly']
));
}
session_destroy();
}
/********************************************************************************
* Session Handler
*******************************************************************************/
public function open($savePath, $sessionName)
{
return true;
}
public function close()
{
return true;
}
public function read($id)
{
return '';
}
public function write($id, $data)
{
return true;
}
public function destroy($id)
{
return true;
}
public function gc($maxlifetime)
{
return true;
}
}