ci-bonfire / Sprint

system/libraries/Session/Session.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 49 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * 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.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 2.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter Session Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Sessions
 * @author		Andrey Andreev
 * @link		http://codeigniter.com/user_guide/libraries/sessions.html
 */
class CI_Session {

	/**
	 * Userdata array
	 *
	 * Just a reference to $_SESSION, for BC purposes.
	 */
	public $userdata;

	protected $_driver = 'files';
	protected $_config;

	// ------------------------------------------------------------------------

	/**
	 * Class constructor
	 *
	 * @param	array	$params	Configuration parameters
	 * @return	void
	 */
	public function __construct(array $params = array())
	{
		// No sessions under CLI
		if (is_cli())
		{
			log_message('debug', 'Session: Initialization under CLI aborted.');
			return;
		}
		elseif ((bool) ini_get('session.auto_start'))
		{
			log_message('error', 'Session: session.auto_start is enabled in php.ini. Aborting.');
			return;
		}
		elseif ( ! empty($params['driver']))
		{
			$this->_driver = $params['driver'];
			unset($params['driver']);
		}
		elseif ($driver = config_item('sess_driver'))
		{
			$this->_driver = $driver;
		}
		// Note: BC workaround
		elseif (config_item('sess_use_database'))
		{
			$this->_driver = 'database';
		}

		$class = $this->_ci_load_classes($this->_driver);

		// Configuration ...
		$this->_configure($params);

		$class = new $class($this->_config);
		if ($class instanceof SessionHandlerInterface)
		{
			if (is_php('5.4'))
			{
				session_set_save_handler($class, TRUE);
			}
			else
			{
				session_set_save_handler(
					array($class, 'open'),
					array($class, 'close'),
					array($class, 'read'),
					array($class, 'write'),
					array($class, 'destroy'),
					array($class, 'gc')
				);

				register_shutdown_function('session_write_close');
			}
		}
		else
		{
			log_message('error', "Session: Driver '".$this->_driver."' doesn't implement SessionHandlerInterface. Aborting.");
			return;
		}

		// Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers
		if (isset($_COOKIE[$this->_config['cookie_name']])
			&& (
				! is_string($_COOKIE[$this->_config['cookie_name']])
				OR ! preg_match('/^[0-9a-f]{40}$/', $_COOKIE[$this->_config['cookie_name']])
			)
		)
		{
			unset($_COOKIE[$this->_config['cookie_name']]);
		}

		session_start();

		// Is session ID auto-regeneration configured? (ignoring ajax requests)
		if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) OR strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest')
			&& ($regenerate_time = config_item('sess_time_to_update')) > 0
		)
		{
			if ( ! isset($_SESSION['__ci_last_regenerate']))
			{
				$_SESSION['__ci_last_regenerate'] = time();
			}
			elseif ($_SESSION['__ci_last_regenerate'] < (time() - $regenerate_time))
			{
				$this->sess_regenerate((bool) config_item('sess_regenerate_destroy'));
			}
		}
		// Another work-around ... PHP doesn't seem to send the session cookie
		// unless it is being currently created or regenerated
		elseif (isset($_COOKIE[$this->_config['cookie_name']]) && $_COOKIE[$this->_config['cookie_name']] === session_id())
		{
			setcookie(
				$this->_config['cookie_name'],
				session_id(),
				(empty($this->_config['cookie_lifetime']) ? 0 : time() + $this->_config['cookie_lifetime']),
				$this->_config['cookie_path'],
				$this->_config['cookie_domain'],
				$this->_config['cookie_secure'],
				TRUE
			);
		}

		$this->_ci_init_vars();

		log_message('info', "Session: Class initialized using '".$this->_driver."' driver.");
	}

	// ------------------------------------------------------------------------

	/**
	 * CI Load Classes
	 *
	 * An internal method to load all possible dependency and extension
	 * classes. It kind of emulates the CI_Driver library, but is
	 * self-sufficient.
	 *
	 * @param	string	$driver	Driver name
	 * @return	string	Driver class name
	 */
	protected function _ci_load_classes($driver)
	{
		// PHP 5.4 compatibility
		interface_exists('SessionHandlerInterface', FALSE) OR require_once(BASEPATH.'libraries/Session/SessionHandlerInterface.php');

		$prefix = config_item('subclass_prefix');

		if ( ! class_exists('CI_Session_driver', FALSE))

This code seems to be duplicated across your project.

		{
			require_once(
				file_exists(APPPATH.'libraries/Session/Session_driver.php')
					? APPPATH.'libraries/Session/Session_driver.php'
					: BASEPATH.'libraries/Session/Session_driver.php'
			);

			if (file_exists($file_path = APPPATH.'libraries/Session/'.$prefix.'Session_driver.php'))
			{
				require_once($file_path);
			}
		}

		$class = 'Session_'.$driver.'_driver';

		// Allow custom drivers without the CI_ or MY_ prefix
		if ( ! class_exists($class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php'))
		{
			require_once($file_path);
			if (class_exists($class, FALSE))
			{
				return $class;
			}
		}

		if ( ! class_exists('CI_'.$class, FALSE))
		{
			if (file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php') OR file_exists($file_path = BASEPATH.'libraries/Session/drivers/'.$class.'.php'))
			{
				require_once($file_path);
			}

			if ( ! class_exists('CI_'.$class, FALSE) && ! class_exists($class, FALSE))
			{
				throw new UnexpectedValueException("Session: Configured driver '".$driver."' was not found. Aborting.");
			}
		}

		if ( ! class_exists($prefix.$class) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
		{
			require_once($file_path);
			if (class_exists($prefix.$class, FALSE))
			{
				return $prefix.$class;
			}
			else
			{
				log_message('debug', 'Session: '.$prefix.$class.".php found but it doesn't declare class ".$prefix.$class.'.');
			}
		}

		return 'CI_'.$class;
	}

	// ------------------------------------------------------------------------

	/**
	 * Configuration
	 *
	 * Handle input parameters and configuration defaults
	 *
	 * @param	array	&$params	Input parameters
	 * @return	void
	 */
	protected function _configure(&$params)
	{
		$expiration = config_item('sess_expiration');

		if (isset($params['cookie_lifetime']))
		{
			$params['cookie_lifetime'] = (int) $params['cookie_lifetime'];
		}
		else
		{
			$params['cookie_lifetime'] = ( ! isset($expiration) && config_item('sess_expire_on_close'))
				? 0 : (int) $expiration;
		}

		isset($params['cookie_name']) OR $params['cookie_name'] = config_item('sess_cookie_name');
		if (empty($params['cookie_name']))
		{
			$params['cookie_name'] = ini_get('session.name');
		}
		else
		{
			ini_set('session.name', $params['cookie_name']);
		}

		isset($params['cookie_path']) OR $params['cookie_path'] = config_item('cookie_path');
		isset($params['cookie_domain']) OR $params['cookie_domain'] = config_item('cookie_domain');
		isset($params['cookie_secure']) OR $params['cookie_secure'] = (bool) config_item('cookie_secure');

		session_set_cookie_params(
			$params['cookie_lifetime'],
			$params['cookie_path'],
			$params['cookie_domain'],
			$params['cookie_secure'],
			TRUE // HttpOnly; Yes, this is intentional and not configurable for security reasons
		);

		if (empty($expiration))
		{
			$params['expiration'] = (int) ini_get('session.gc_maxlifetime');
		}
		else
		{
			$params['expiration'] = (int) $expiration;
			ini_set('session.gc_maxlifetime', $expiration);
		}

		$params['match_ip'] = (bool) (isset($params['match_ip']) ? $params['match_ip'] : config_item('sess_match_ip'));

		isset($params['save_path']) OR $params['save_path'] = config_item('sess_save_path');

		$this->_config = $params;

		// Security is king
		ini_set('session.use_trans_sid', 0);
		ini_set('session.use_strict_mode', 1);
		ini_set('session.use_cookies', 1);
		ini_set('session.use_only_cookies', 1);
		ini_set('session.hash_function', 1);
		ini_set('session.hash_bits_per_character', 4);
	}

	// ------------------------------------------------------------------------

	/**
	 * Handle temporary variables
	 *
	 * Clears old "flash" data, marks the new one for deletion and handles
	 * "temp" data deletion.
	 *
	 * @return	void
	 */
	protected function _ci_init_vars()
	{
		if ( ! empty($_SESSION['__ci_vars']))
		{
			$current_time = time();

			foreach ($_SESSION['__ci_vars'] as $key => &$value)
			{
				if ($value === 'new')
				{
					$_SESSION['__ci_vars'][$key] = 'old';
				}
				// Hacky, but 'old' will (implicitly) always be less than time() ;)
				// DO NOT move this above the 'new' check!
				elseif ($value < $current_time)
				{
					unset($_SESSION[$key], $_SESSION['__ci_vars'][$key]);
				}
			}

			if (empty($_SESSION['__ci_vars']))
			{
				unset($_SESSION['__ci_vars']);
			}
		}

		$this->userdata =& $_SESSION;
	}

	// ------------------------------------------------------------------------

	/**
	 * Mark as flash
	 *
	 * @param	mixed	$key	Session data key(s)
	 * @return	bool
	 */
	public function mark_as_flash($key)
	{
		if (is_array($key))
		{
			for ($i = 0, $c = count($key); $i < $c; $i++)
			{
				if ( ! isset($_SESSION[$key[$i]]))
				{
					return FALSE;
				}
			}

			$new = array_fill_keys($key, 'new');

			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars'])
				? array_merge($_SESSION['__ci_vars'], $new)
				: $new;

			return TRUE;
		}

		if ( ! isset($_SESSION[$key]))
		{
			return FALSE;
		}

		$_SESSION['__ci_vars'][$key] = 'new';
		return TRUE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Get flash keys
	 *
	 * @return	array
	 */
	public function get_flash_keys()
	{
		if ( ! isset($_SESSION['__ci_vars']))
		{
			return array();
		}

		$keys = array();
		foreach (array_keys($_SESSION['__ci_vars']) as $key)
		{
			is_int($_SESSION['__ci_vars'][$key]) OR $keys[] = $key;
		}

		return $keys;
	}

	// ------------------------------------------------------------------------

	/**
	 * Unmark flash
	 *
	 * @param	mixed	$key	Session data key(s)
	 * @return	void
	 */
	public function unmark_flash($key)
	{
		if (empty($_SESSION['__ci_vars']))
		{
			return;
		}

		is_array($key) OR $key = array($key);

		foreach ($key as $k)
		{
			if (isset($_SESSION['__ci_vars'][$k]) && ! is_int($_SESSION['__ci_vars'][$k]))
			{
				unset($_SESSION['__ci_vars'][$k]);
			}
		}

		if (empty($_SESSION['__ci_vars']))
		{
			unset($_SESSION['__ci_vars']);
		}
	}

	// ------------------------------------------------------------------------

	/**
	 * Mark as temp
	 *
	 * @param	mixed	$key	Session data key(s)
	 * @param	int	$ttl	Time-to-live in seconds
	 * @return	bool
	 */
	public function mark_as_temp($key, $ttl = 300)
	{
		$ttl += time();

		if (is_array($key))
		{
			$temp = array();

			foreach ($key as $k => $v)
			{
				// Do we have a key => ttl pair, or just a key?
				if (is_int($k))
				{
					$k = $v;
					$v = $ttl;
				}
				else
				{
					$v += time();
				}

				if ( ! isset($_SESSION[$k]))
				{
					return FALSE;
				}

				$temp[$k] = $v;
			}

			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars'])
				? array_merge($_SESSION['__ci_vars'], $temp)
				: $temp;

			return TRUE;
		}

		if ( ! isset($_SESSION[$key]))
		{
			return FALSE;
		}

		$_SESSION['__ci_vars'][$key] = $ttl;
		return TRUE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Get temp keys
	 *
	 * @return	array
	 */
	public function get_temp_keys()
	{
		if ( ! isset($_SESSION['__ci_vars']))
		{
			return array();
		}

		$keys = array();
		foreach (array_keys($_SESSION['__ci_vars']) as $key)
		{
			is_int($_SESSION['__ci_vars'][$key]) && $keys[] = $key;
		}

		return $keys;
	}

	// ------------------------------------------------------------------------

	/**
	 * Unmark flash
	 *
	 * @param	mixed	$key	Session data key(s)
	 * @return	void
	 */
	public function unmark_temp($key)
	{
		if (empty($_SESSION['__ci_vars']))
		{
			return;
		}

		is_array($key) OR $key = array($key);

		foreach ($key as $k)
		{
			if (isset($_SESSION['__ci_vars'][$k]) && is_int($_SESSION['__ci_vars'][$k]))
			{
				unset($_SESSION['__ci_vars'][$k]);
			}
		}

		if (empty($_SESSION['__ci_vars']))
		{
			unset($_SESSION['__ci_vars']);
		}
	}

	// ------------------------------------------------------------------------

	/**
	 * __get()
	 *
	 * @param	string	$key	'session_id' or a session data key
	 * @return	mixed
	 */
	public function __get($key)
	{
		// Note: Keep this order the same, just in case somebody wants to
		//       use 'session_id' as a session data key, for whatever reason
		if (isset($_SESSION[$key]))
		{
			return $_SESSION[$key];
		}
		elseif ($key === 'session_id')
		{
			return session_id();
		}

		return NULL;
	}

	// ------------------------------------------------------------------------

	/**
	 * __set()
	 *
	 * @param	string	$key	Session data key
	 * @param	mixed	$value	Session data value
	 * @return	void
	 */
	public function __set($key, $value)
	{
		$_SESSION[$key] = $value;
	}

	// ------------------------------------------------------------------------

	/**
	 * Session destroy
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @return	void
	 */
	public function sess_destroy()
	{
		session_destroy();
	}

	// ------------------------------------------------------------------------

	/**
	 * Session regenerate
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	bool	$destroy	Destroy old session data flag
	 * @return	void
	 */
	public function sess_regenerate($destroy = FALSE)
	{
		$_SESSION['__ci_last_regenerate'] = time();
		session_regenerate_id($destroy);
	}

	// ------------------------------------------------------------------------

	/**
	 * Get userdata reference
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @returns	array
	 */
	public function &get_userdata()
	{
		return $_SESSION;
	}

	// ------------------------------------------------------------------------

	/**
	 * Userdata (fetch)
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	string	$key	Session data key
	 * @return	mixed	Session data value or NULL if not found
	 */
	public function userdata($key = NULL)
	{
		if (isset($key))
		{
			return isset($_SESSION[$key]) ? $_SESSION[$key] : NULL;
		}
		elseif (empty($_SESSION))
		{
			return array();
		}

		$userdata = array();
		$_exclude = array_merge(
			array('__ci_vars'),
			$this->get_flash_keys(),
			$this->get_temp_keys()
		);

		foreach (array_keys($_SESSION) as $key)
		{
			if ( ! in_array($key, $_exclude, TRUE))
			{
				$userdata[$key] = $_SESSION[$key];
			}
		}

		return $userdata;
	}

	// ------------------------------------------------------------------------

	/**
	 * Set userdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$data	Session data key or an associative array
	 * @param	mixed	$value	Value to store
	 * @return	void
	 */
	public function set_userdata($data, $value = NULL)
	{
		if (is_array($data))
		{
			foreach ($data as $key => &$value)
			{
				$_SESSION[$key] = $value;
			}

			return;
		}

		$_SESSION[$data] = $value;
	}

	// ------------------------------------------------------------------------

	/**
	 * Unset userdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$data	Session data key(s)
	 * @return	void
	 */
	public function unset_userdata($key)
	{
		if (is_array($key))
		{
			foreach ($key as $k)
			{
				unset($_SESSION[$k]);
			}

			return;
		}

		unset($_SESSION[$key]);
	}

	// ------------------------------------------------------------------------

	/**
	 * All userdata (fetch)
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @return	array	$_SESSION, excluding flash data items
	 */
	public function all_userdata()
	{
		return $this->userdata();
	}

	// ------------------------------------------------------------------------

	/**
	 * Has userdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	string	$key	Session data key
	 * @return	bool
	 */
	public function has_userdata($key)
	{
		return isset($_SESSION[$key]);
	}

	// ------------------------------------------------------------------------

	/**
	 * Flashdata (fetch)
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	string	$key	Session data key
	 * @return	mixed	Session data value or NULL if not found
	 */
	public function flashdata($key = NULL)
	{
		if (isset($key))
		{
			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && ! is_int($_SESSION['__ci_vars'][$key]))
				? $_SESSION[$key]
				: NULL;
		}

		$flashdata = array();

		if ( ! empty($_SESSION['__ci_vars']))
		{
			foreach ($_SESSION['__ci_vars'] as $key => &$value)
			{
				is_int($value) OR $flashdata[$key] = $_SESSION[$key];
			}
		}

		return $flashdata;
	}

	// ------------------------------------------------------------------------

	/**
	 * Set flashdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$data	Session data key or an associative array
	 * @param	mixed	$value	Value to store
	 * @return	void
	 */
	public function set_flashdata($data, $value = NULL)
	{
		$this->set_userdata($data, $value);
		$this->mark_as_flash(is_array($data) ? array_keys($data) : $data);
	}

	// ------------------------------------------------------------------------

	/**
	 * Keep flashdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$key	Session data key(s)
	 * @return	void
	 */
	public function keep_flashdata($key)
	{
		$this->mark_as_flash($key);
	}

	// ------------------------------------------------------------------------

	/**
	 * Temp data (fetch)
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	string	$key	Session data key
	 * @return	mixed	Session data value or NULL if not found
	 */
	public function tempdata($key = NULL)
	{
		if (isset($key))
		{
			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && is_int($_SESSION['__ci_vars'][$key]))
				? $_SESSION[$key]
				: NULL;
		}

		$tempdata = array();

		if ( ! empty($_SESSION['__ci_vars']))
		{
			foreach ($_SESSION['__ci_vars'] as $key => &$value)
			{
				is_int($value) && $tempdata[$key] = $_SESSION[$key];
			}
		}

		return $tempdata;
	}

	// ------------------------------------------------------------------------

	/**
	 * Set tempdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$data	Session data key or an associative array of items
	 * @param	mixed	$value	Value to store
	 * @param	int	$ttl	Time-to-live in seconds
	 * @return	void
	 */
	public function set_tempdata($data, $value = NULL, $ttl = 300)
	{
		$this->set_userdata($data, $value);
		$this->mark_as_temp(is_array($data) ? array_keys($data) : $data, $ttl);
	}

	// ------------------------------------------------------------------------

	/**
	 * Unset tempdata
	 *
	 * Legacy CI_Session compatibility method
	 *
	 * @param	mixed	$data	Session data key(s)
	 * @return	void
	 */
	public function unset_tempdata($key)
	{
		$this->unmark_temp($key);
	}

}