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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2010, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 2.0
* @filesource
*/
/**
* Native PHP session management driver
*
* This is the driver that uses the native PHP $_SESSION array through the Session driver library.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author ExpressionEngine Dev Team
*/
class CI_Session_native extends CI_Session_driver {
/**
* Initialize session driver object
*
* @access protected
* @return void
*/
protected function initialize()
{
// Get config parameters
$config = array();
$CI =& get_instance();
$prefs = array(
'sess_cookie_name',
'sess_expire_on_close',
'sess_expiration',
'sess_match_ip',
'sess_match_useragent',
'sess_time_to_update',
'cookie_prefix',
'cookie_path',
'cookie_domain'
);
foreach ($prefs as $key)
{
$config[$key] = isset($this->_parent->params[$key]) ? $this->_parent->params[$key] :
$CI->config->item($key);
}
// Set session name, if specified
if ($config['sess_cookie_name'])
{
// Differentiate name from cookie driver with '_id' suffix
$name = $config['sess_cookie_name'].'_id';
if ($config['cookie_prefix'])
{
// Prepend cookie prefix
$name = $config['cookie_prefix'].$name;
}
session_name($name);
}
// Set expiration, path, and domain
$expire = 7200;
$path = '/';
$domain = '';
if ($config['sess_expiration'] !== FALSE)
{
// Default to 2 years if expiration is "0"
$expire = ($config['sess_expiration'] == 0) ? (60*60*24*365*2) : $config['sess_expiration'];
}
if ($config['cookie_path'])
{
// Use specified path
$path = $config['cookie_path'];
}
if ($config['cookie_domain'])
{
// Use specified domain
$domain = $config['cookie_domain'];
}
session_set_cookie_params($config['sess_expire_on_close'] ? 0 : $expire, $path, $domain);
// Start session
session_start();
// Check session expiration, ip, and agent
$now = time();
$destroy = FALSE;
if (isset($_SESSION['last_activity']) && ($_SESSION['last_activity'] + $expire) < $now)
{
// Expired - destroy
$destroy = TRUE;
}
else if ($config['sess_match_ip'] == TRUE && isset($_SESSION['ip_address']) &&
$_SESSION['ip_address'] != $CI->input->ip_address())
{
// IP doesn't match - destroy
$destroy = TRUE;
}
else if ($config['sess_match_useragent'] == TRUE && isset($_SESSION['user_agent']) &&
$_SESSION['user_agent'] != trim(substr($CI->input->user_agent(), 0, 50)))
{
// Agent doesn't match - destroy
$destroy = TRUE;
}
// Destroy expired or invalid session
if ($destroy)
{
// Clear old session and start new
$this->sess_destroy();
session_start();
}
// Check for update time
if ($config['sess_time_to_update'] && isset($_SESSION['last_activity']) &&
($_SESSION['last_activity'] + $config['sess_time_to_update']) < $now)
{
// Regenerate ID, but don't destroy session
$this->sess_regenerate(FALSE);
}
// Set activity time
$_SESSION['last_activity'] = $now;
// Set matching values as required
if ($config['sess_match_ip'] == TRUE && !isset($_SESSION['ip_address']))
{
// Store user IP address
$_SESSION['ip_address'] = $CI->input->ip_address();
}
if ($config['sess_match_useragent'] == TRUE && !isset($_SESSION['user_agent']))
{
// Store user agent string
$_SESSION['user_agent'] = trim(substr($CI->input->user_agent(), 0, 50));
}
// Make session ID available
$_SESSION['session_id'] = session_id();
}
/**
* Save the session data
*
* @access public
* @return void
*/
public function sess_save()
{
// Nothing to do - changes to $_SESSION are automatically saved
}
/**
* Destroy the current session
*
* @access public
* @return void
*/
public function sess_destroy()
{
// Cleanup session
$_SESSION = array();
$name = session_name();
if (isset($_COOKIE[$name]))
{
// Clear session cookie
$params = session_get_cookie_params();
setcookie($name, '', time() - 42000, $params['path'], $params['domain']);
unset($_COOKIE[$name]);
}
session_destroy();
}
/**
* Regenerate the current session
*
* Regenerate the session id
*
* @access public
* @param boolean Destroy session data flag (default: FALSE)
* @return void
*/
public function sess_regenerate($destroy = FALSE)
{
// Just regenerate id, passing destroy flag
session_regenerate_id($destroy);
$_SESSION['session_id'] = session_id();
}
/**
* Get a reference to user data array
*
* @access public
* @return array Reference to userdata
*/
public function &get_userdata()
{
// Just return reference to $_SESSION
return $_SESSION;
}
}
/* End of file Session_native.php */
/* Location: ./system/libraries/Session/drivers/Session_native.php */
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