/
Session.php
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/
Session.php
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<?php
/**
* Session class for CakePHP.
*
* CakePHP abstracts the handling of sessions.
* There are several convenient methods to access session information.
* This class is the implementation of those methods.
* They are mostly used by the Session Component.
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since 0.10.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Network;
use Cake\Core\App;
use Cake\Core\Configure;
use Cakedd\Error;
use Cake\Utility\Hash;
use SessionHandlerInterface;
/**
* Session class for CakePHP.
*
* CakePHP abstracts the handling of sessions. There are several convenient methods to access session information.
* This class is the implementation of those methods. They are mostly used by the Session Component.
*
*/
class Session {
/**
* Path to where the session is active.
*
* @var string
*/
public static $path = '/';
/**
* Current Session id
*
* @var string
*/
public static $id = null;
/**
* Session cookie name
*
* @var string
*/
protected static $_cookieName = null;
protected $_engine;
protected $_started;
public static function create($sessionConfig = []) {
if (isset($sessionConfig['defaults'])) {
$defaults = static::_defaultConfig($sessionConfig['defaults']);
if ($defaults) {
$sessionConfig = Hash::merge($defaults, $sessionConfig);
}
}
if (!isset($sessionConfig['ini']['session.cookie_secure']) && env('HTTPS')) {
$sessionConfig['ini']['session.cookie_secure'] = 1;
}
if (isset($sessionConfig['timeout']) && !isset($sessionConfig['cookieTimeout'])) {
$sessionConfig['cookieTimeout'] = $sessionConfig['timeout'];
}
if (!isset($sessionConfig['ini']['session.cookie_lifetime'])) {
$sessionConfig['ini']['session.cookie_lifetime'] = $sessionConfig['cookieTimeout'] * 60;
}
if (!isset($sessionConfig['ini']['session.name'])) {
$sessionConfig['ini']['session.name'] = $sessionConfig['cookie'];
}
static::$_cookieName = $sessionConfig['ini']['session.name'];
if (!empty($sessionConfig['handler'])) {
$sessionConfig['ini']['session.save_handler'] = 'user';
}
if (!isset($sessionConfig['ini']['session.gc_maxlifetime'])) {
$sessionConfig['ini']['session.gc_maxlifetime'] = $sessionConfig['timeout'] * 60;
}
if (!isset($sessionConfig['ini']['session.cookie_httponly'])) {
$sessionConfig['ini']['session.cookie_httponly'] = 1;
}
return new static($config);
}
/**
* Get one of the prebaked default session configurations.
*
* @param string $name
* @return bool|array
*/
protected static function _defaultConfig($name) {
$defaults = array(
'php' => array(
'checkAgent' => false,
'cookie' => 'CAKEPHP',
'timeout' => 240,
'ini' => array(
'session.use_trans_sid' => 0,
'session.cookie_path' => static::$path
)
),
'cake' => array(
'checkAgent' => false,
'cookie' => 'CAKEPHP',
'timeout' => 240,
'ini' => array(
'session.use_trans_sid' => 0,
'url_rewriter.tags' => '',
'session.serialize_handler' => 'php',
'session.use_cookies' => 1,
'session.cookie_path' => static::$path,
'session.save_path' => TMP . 'sessions',
'session.save_handler' => 'files'
)
),
'cache' => array(
'checkAgent' => false,
'cookie' => 'CAKEPHP',
'timeout' => 240,
'ini' => array(
'session.use_trans_sid' => 0,
'url_rewriter.tags' => '',
'session.use_cookies' => 1,
'session.cookie_path' => static::$path,
'session.save_handler' => 'user',
),
'handler' => array(
'engine' => 'CacheSession',
'config' => 'default'
)
),
'database' => array(
'checkAgent' => false,
'cookie' => 'CAKEPHP',
'timeout' => 240,
'ini' => array(
'session.use_trans_sid' => 0,
'url_rewriter.tags' => '',
'session.use_cookies' => 1,
'session.cookie_path' => static::$path,
'session.save_handler' => 'user',
'session.serialize_handler' => 'php',
),
'handler' => array(
'engine' => 'DatabaseSession'
)
)
);
if (isset($defaults[$name])) {
return $defaults[$name];
}
return false;
}
public function __construct($config = []) {
if (!empty($config['ini']) && is_array($config['ini'])) {
$this->options($config['ini']);
}
if (!empty($config['handler']) && !isset($config['handler']['engine'])) {
//TODO: REmove this feature
call_user_func_array('session_set_save_handler', $config['handler']);
}
if (!empty($config['handler']['engine'])) {
session_set_save_handler($this->engine($config['handler']['engine']), false);
}
session_register_shutdown();
}
/**
* Find the handler class and make sure it implements the correct interface.
*
* @param string $class
* @return void
* @throws \Cake\Error\Exception
*/
public function engine($class = null) {
if ($class === null) {
return $this->_engine;
}
$class = App::className($class, 'Network/Session');
if (!class_exists($class)) {
throw new Error\Exception(sprintf('Could not load %s to handle the session.', $class));
}
$handler = new $class();
if (!($handler instanceof SessionHandlerInterface)) {
throw new Error\Exception(
'Chosen SessionHandler does not implement SessionHandlerInterface, it cannot be used with an engine key.'
);
}
$this->_engine = $engine;
}
public function options(array $options) {
if (session_status() === \PHP_SESSION_ACTIVE) {
return;
}
foreach ($options as $setting => $value) {
if (ini_set($setting, $value) === false) {
throw new Error\Exception(sprintf(
sprintf('Unable to configure the session, setting %s failed.'),
$setting
));
}
}
}
/**
* Starts the Session.
*
* @return bool True if session was started
*/
public function start() {
if ($this->_started) {
return true;
}
if (session_status() === \PHP_SESSION_ACTIVE) {
throw new \RuntimeException('Session was already started');
}
if (ini_get('session.use_cookies') && headers_sent($file, $line)) {
throw new \RuntimeException(
sprintf('Cannot start session, headers already sent in "%s" at line %d', $file, $line)
);
}
if (!session_start()) {
throw new \RuntimeException('Could not start the session');
}
return $this->_started = true;
}
/**
* Determine if Session has been started.
*
* @return bool True if session has been started.
*/
public function started() {
return $this->_started || session_status() === \PHP_SESSION_ACTIVE;
}
/**
* Returns true if given variable is set in session.
*
* @param string $name Variable name to check for
* @return bool True if variable is there
*/
public function check($name = null) {
if (empty($name)) {
return false;
}
if ($this->_hasSession() && !$this->started()) {
$this->start();
}
return Hash::get($_SESSION, $name) !== null;
}
/**
* Returns given session variable, or all of them, if no parameters given.
*
* @param string|array $name The name of the session variable (or a path as sent to Set.extract)
* @return mixed The value of the session variable, null if session not available,
* session not started, or provided name not found in the session.
*/
public function read($name = null) {
if (empty($name) && $name !== null) {
return null;
}
if ($this->_hasSession() && !$this->started()) {
$this->start();
}
if ($name === null) {
return $_SESSION ?: [];
}
return Hash::get($_SESSION, $name);
}
/**
* Writes value to given session variable name.
*
* @param string|array $name Name of variable
* @param string $value Value to write
* @return bool True if the write was successful, false if the write failed
*/
public function write($name, $value = null) {
if (empty($name)) {
return;
}
if (!$this->started()) {
$this->start();
}
$write = $name;
if (!is_array($name)) {
$write = array($name => $value);
}
$data = $_SESSION ?: [];
foreach ($write as $key => $val) {
$data = Hash::insert($data, $key, $val);
}
$this->_overwrite($_SESSION, $data);
}
/**
* Returns the session id.
* Calling this method will not auto start the session. You might have to manually
* assert a started session.
*
* Passing an id into it, you can also replace the session id if the session
* has not already been started.
* Note that depending on the session handler, not all characters are allowed
* within the session id. For example, the file session handler only allows
* characters in the range a-z A-Z 0-9 , (comma) and - (minus).
*
* @param string $id Id to replace the current session id
* @return string Session id
*/
public static function id($id = null) {
if ($id) {
static::$id = $id;
session_id(static::$id);
}
if (static::started()) {
return session_id();
}
return static::$id;
}
/**
* Removes a variable from session.
*
* @param string $name Session variable to remove
* @return bool Success
*/
public function delete($name) {
if (static::check($name)) {
static::_overwrite($_SESSION, Hash::remove($_SESSION, $name));
return !static::check($name);
}
return false;
}
/**
* Used to write new data to _SESSION, since PHP doesn't like us setting the _SESSION var itself.
*
* @param array $old Set of old variables => values
* @param array $new New set of variable => value
* @return void
*/
protected function _overwrite(&$old, $new) {
if (!empty($old)) {
foreach ($old as $key => $var) {
if (!isset($new[$key])) {
unset($old[$key]);
}
}
}
foreach ($new as $key => $var) {
$old[$key] = $var;
}
}
/**
* Helper method to destroy invalid sessions.
*
* @return void
*/
public static function destroy() {
if (!static::started()) {
static::_startSession();
}
session_destroy();
$_SESSION = null;
static::$id = null;
static::$_cookieName = null;
}
/**
* Clears the session, the session id, and renews the session.
*
* @return void
*/
public static function clear() {
$_SESSION = null;
static::$id = null;
static::renew();
}
/**
* Returns whether a session exists
* @return bool
*/
protected function _hasSession() {
$present = !ini_get('session.use_cookies') || isset($_COOKIE[session_name()]);
return $this->started() || $present;
}
/**
* Restarts this session.
*
* @return void
*/
public static function renew() {
if (session_id()) {
if (session_id() || isset($_COOKIE[session_name()])) {
setcookie(Configure::read('Session.cookie'), '', time() - 42000, static::$path);
}
session_regenerate_id(true);
}
}
}