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Diffstat (limited to 'system/libraries/Session/Session.php')
| -rwxr-xr-x | system/libraries/Session/Session.php | 689 |
1 files changed, 689 insertions, 0 deletions
diff --git a/system/libraries/Session/Session.php b/system/libraries/Session/Session.php new file mode 100755 index 000000000..e6f6050c0 --- /dev/null +++ b/system/libraries/Session/Session.php @@ -0,0 +1,689 @@ +<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +/** + * CodeIgniter + * + * An open source application development framework for PHP 5.2.4 or newer + * + * NOTICE OF LICENSE + * + * Licensed under the Open Software License version 3.0 + * + * This source file is subject to the Open Software License (OSL 3.0) that is + * bundled with this package in the files license.txt / license.rst. It is + * also available through the world wide web at this URL: + * http://opensource.org/licenses/OSL-3.0 + * If you did not receive a copy of the license and are unable to obtain it + * through the world wide web, please send an email to + * licensing@ellislab.com so we can send you a copy immediately. + * + * @package CodeIgniter + * @author EllisLab Dev Team + * @copyright Copyright (c) 2006 - 2012 EllisLab, Inc. + * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) + * @link http://codeigniter.com + * @since Version 2.0 + * @filesource + */ + +/** + * CodeIgniter Session Class + * + * The user interface defined by EllisLabs, now with puggable drivers to manage different storage mechanisms. + * By default, the cookie session driver will load, but the 'sess_driver' config/param item (see above) can be + * used to specify the 'native' driver, or any other you might create. + * Once loaded, this driver setup is a drop-in replacement for the former CI_Session library, taking its place as the + * 'session' member of the global controller framework (e.g.: $CI->session or $this->session). + * In keeping with the CI_Driver methodology, multiple drivers may be loaded, although this might be a bit confusing. + * The CI_Session library class keeps track of the most recently loaded driver as "current" to call for driver methods. + * Ideally, one driver is loaded and all calls go directly through the main library interface. However, any methods + * called through the specific driver will switch the "current" driver to itself before invoking the library method + * (which will then call back into the driver for low-level operations). So, alternation between two drivers can be + * achieved by specifying which driver to use for each call (e.g.: $this->session->native->set_userdata('foo', 'bar'); + * $this->session->cookie->userdata('foo'); $this->session->native->unset_userdata('foo');). Notice in the previous + * example that the _native_ userdata value 'foo' would be set to 'bar', which would NOT be returned by the call for + * the _cookie_ userdata 'foo', nor would the _cookie_ value be unset by the call to unset the _native_ 'foo' value. + * + * @package CodeIgniter + * @subpackage Libraries + * @category Sessions + * @author EllisLab Dev Team + * @link http://codeigniter.com/user_guide/libraries/sessions.html + */ +class CI_Session extends CI_Driver_Library { + + public $params = array(); + protected $current = NULL; + protected $userdata = array(); + + const FLASHDATA_KEY = 'flash'; + const FLASHDATA_NEW = ':new:'; + const FLASHDATA_OLD = ':old:'; + const FLASHDATA_EXP = ':exp:'; + const EXPIRATION_KEY = '__expirations'; + const TEMP_EXP_DEF = 300; + + /** + * CI_Session constructor + * + * The constructor loads the configured driver ('sess_driver' in config.php or as a parameter), running + * routines in its constructor, and manages flashdata aging. + * + * @param array Configuration parameters + */ + public function __construct(array $params = array()) + { + log_message('debug', 'CI_Session Class Initialized'); + + // Get valid drivers list + $CI =& get_instance(); + $this->valid_drivers = array( + 'Session_native', + 'Session_cookie' + ); + $key = 'sess_valid_drivers'; + $drivers = isset($params[$key]) ? $params[$key] : $CI->config->item($key); + if ($drivers) + { + is_array($drivers) OR $drivers = array($drivers); + + // Add driver names to valid list + foreach ($drivers as $driver) + { + if ( ! in_array(strtolower($driver), array_map('strtolower', $this->valid_drivers))) + { + $this->valid_drivers[] = $driver; + } + } + } + + // Get driver to load + $key = 'sess_driver'; + $driver = isset($params[$key]) ? $params[$key] : $CI->config->item($key); + if ( ! $driver) + { + $driver = 'cookie'; + } + + if ( ! in_array('session_'.strtolower($driver), array_map('strtolower', $this->valid_drivers))) + { + $this->valid_drivers[] = 'Session_'.$driver; + } + + // Save a copy of parameters in case drivers need access + $this->params = $params; + + // Load driver and get array reference + $this->load_driver($driver); + + // Delete 'old' flashdata (from last request) + $this->_flashdata_sweep(); + + // Mark all new flashdata as old (data will be deleted before next request) + $this->_flashdata_mark(); + + // Delete expired tempdata + $this->_tempdata_sweep(); + + log_message('debug', 'CI_Session routines successfully run'); + } + + // ------------------------------------------------------------------------ + + /** + * Loads session storage driver + * + * @param string Driver classname + * @return object Loaded driver object + */ + public function load_driver($driver) + { + // Save reference to most recently loaded driver as library default and sync userdata + $this->current = parent::load_driver($driver); + $this->userdata =& $this->current->get_userdata(); + return $this->current; + } + + // ------------------------------------------------------------------------ + + /** + * Select default session storage driver + * + * @param string Driver classname + * @return void + */ + public function select_driver($driver) + { + // Validate driver name + $lowername = strtolower(str_replace('CI_', '', $driver)); + if (in_array($lowername, array_map('strtolower', $this->valid_drivers))) + { + // See if driver is loaded + $child = str_replace($this->lib_name.'_', '', $driver); + if (isset($this->$child)) + { + // See if driver is already current + if ($this->$child !== $this->current) + { + // Make driver current and sync userdata + $this->current = $this->$child; + $this->userdata =& $this->current->get_userdata(); + } + } + else + { + // Load new driver + $this->load_driver($child); + } + } + } + + // ------------------------------------------------------------------------ + + /** + * Destroy the current session + * + * @return void + */ + public function sess_destroy() + { + // Just call destroy on driver + $this->current->sess_destroy(); + } + + // ------------------------------------------------------------------------ + + /** + * Regenerate the current session + * + * @param bool Destroy session data flag (default: false) + * @return void + */ + public function sess_regenerate($destroy = FALSE) + { + // Call regenerate on driver and resync userdata + $this->current->sess_regenerate($destroy); + $this->userdata =& $this->current->get_userdata(); + } + + // ------------------------------------------------------------------------ + + /** + * Fetch a specific item from the session array + * + * @param string Item key + * @return string Item value or NULL if not found + */ + public function userdata($item) + { + return isset($this->userdata[$item]) ? $this->userdata[$item] : NULL; + } + + // ------------------------------------------------------------------------ + + /** + * Fetch all session data + * + * @return array User data array + */ + public function all_userdata() + { + return isset($this->userdata) ? $this->userdata : NULL; + } + + // ------------------------------------------------------------------------ + + /** + * Fetch all flashdata + * + * @return array Flash data array + */ + public function all_flashdata() + { + $out = array(); + + // loop through all userdata + foreach ($this->all_userdata() as $key => $val) + { + // if it contains flashdata, add it + if (strpos($key, self::FLASHDATA_KEY.self::FLASHDATA_OLD) !== FALSE) + { + $key = str_replace(self::FLASHDATA_KEY.self::FLASHDATA_OLD, '', $key); + $out[$key] = $val; + } + } + return $out; + } + + // ------------------------------------------------------------------------ + + /** + * Add or change data in the "userdata" array + * + * @param mixed Item name or array of items + * @param string Item value or empty string + * @return void + */ + public function set_userdata($newdata = array(), $newval = '') + { + // Wrap params as array if singular + if (is_string($newdata)) + { + $newdata = array($newdata => $newval); + } + + // Set each name/value pair + if (count($newdata) > 0) + { + foreach ($newdata as $key => $val) + { + $this->userdata[$key] = $val; + } + } + + // Tell driver data changed + $this->current->sess_save(); + } + + // ------------------------------------------------------------------------ + + /** + * Delete a session variable from the "userdata" array + * + * @param mixed Item name or array of item names + * @return void + */ + public function unset_userdata($newdata = array()) + { + // Wrap single name as array + if (is_string($newdata)) + { + $newdata = array($newdata => ''); + } + + // Unset each item name + if (count($newdata) > 0) + { + foreach (array_keys($newdata) as $key) + { + unset($this->userdata[$key]); + } + } + + // Tell driver data changed + $this->current->sess_save(); + } + + // ------------------------------------------------------------------------ + + /** + * Determine if an item exists + * + * @param string Item name + * @return bool + */ + public function has_userdata($item) + { + return isset($this->userdata[$item]); + } + + // ------------------------------------------------------------------------ + + /** + * Add or change flashdata, only available until the next request + * + * @param mixed Item name or array of items + * @param string Item value or empty string + * @return void + */ + public function set_flashdata($newdata = array(), $newval = '') + { + // Wrap item as array if singular + if (is_string($newdata)) + { + $newdata = array($newdata => $newval); + } + + // Prepend each key name and set value + if (count($newdata) > 0) + { + foreach ($newdata as $key => $val) + { + $flashdata_key = self::FLASHDATA_KEY.self::FLASHDATA_NEW.$key; + $this->set_userdata($flashdata_key, $val); + } + } + } + + // ------------------------------------------------------------------------ + + /** + * Keeps existing flashdata available to next request. + * + * @param string Item key + * @return void + */ + public function keep_flashdata($key) + { + // 'old' flashdata gets removed. Here we mark all flashdata as 'new' to preserve it from _flashdata_sweep() + // Note the function will return NULL if the $key provided cannot be found + $old_flashdata_key = self::FLASHDATA_KEY.self::FLASHDATA_OLD.$key; + $value = $this->userdata($old_flashdata_key); + + $new_flashdata_key = self::FLASHDATA_KEY.self::FLASHDATA_NEW.$key; + $this->set_userdata($new_flashdata_key, $value); + } + + // ------------------------------------------------------------------------ + + /** + * Fetch a specific flashdata item from the session array + * + * @param string Item key + * @return string + */ + public function flashdata($key) + { + // Prepend key and retrieve value + $flashdata_key = self::FLASHDATA_KEY.self::FLASHDATA_OLD.$key; + return $this->userdata($flashdata_key); + } + + // ------------------------------------------------------------------------ + + /** + * Add or change tempdata, only available until expiration + * + * @param mixed Item name or array of items + * @param string Item value or empty string + * @param int Item lifetime in seconds or 0 for default + * @return void + */ + public function set_tempdata($newdata = array(), $newval = '', $expire = 0) + { + // Set expiration time + $expire = time() + ($expire ? $expire : self::TEMP_EXP_DEF); + + // Wrap item as array if singular + if (is_string($newdata)) + { + $newdata = array($newdata => $newval); + } + + // Get or create expiration list + $expirations = $this->userdata(self::EXPIRATION_KEY); + if ( ! $expirations) + { + $expirations = array(); + } + + // Prepend each key name and set value + if (count($newdata) > 0) + { + foreach ($newdata as $key => $val) + { + $tempdata_key = self::FLASHDATA_KEY.self::FLASHDATA_EXP.$key; + $expirations[$tempdata_key] = $expire; + $this->set_userdata($tempdata_key, $val); + } + } + + // Update expiration list + $this->set_userdata(self::EXPIRATION_KEY, $expirations); + } + + // ------------------------------------------------------------------------ + + /** + * Delete a temporary session variable from the "userdata" array + * + * @param mixed Item name or array of item names + * @return void + */ + public function unset_tempdata($newdata = array()) + { + // Get expirations list + $expirations = $this->userdata(self::EXPIRATION_KEY); + if (empty($expirations)) + { + // Nothing to do + return; + } + + // Wrap single name as array + if (is_string($newdata)) + { + $newdata = array($newdata => ''); + } + + // Prepend each item name and unset + if (count($newdata) > 0) + { + foreach (array_keys($newdata) as $key) + { + $tempdata_key = self::FLASHDATA_KEY.self::FLASHDATA_EXP.$key; + unset($expirations[$tempdata_key]); + $this->unset_userdata($tempdata_key); + } + } + + // Update expiration list + $this->set_userdata(self::EXPIRATION_KEY, $expirations); + } + + // ------------------------------------------------------------------------ + + /** + * Fetch a specific tempdata item from the session array + * + * @param string Item key + * @return string + */ + public function tempdata($key) + { + // Prepend key and return value + $tempdata_key = self::FLASHDATA_KEY.self::FLASHDATA_EXP.$key; + return $this->userdata($tempdata_key); + } + + // ------------------------------------------------------------------------ + + /** + * Identifies flashdata as 'old' for removal + * when _flashdata_sweep() runs. + * + * @return void + */ + protected function _flashdata_mark() + { + foreach ($this->all_userdata() as $name => $value) + { + $parts = explode(self::FLASHDATA_NEW, $name); + if (is_array($parts) && count($parts) === 2) + { + $new_name = self::FLASHDATA_KEY.self::FLASHDATA_OLD.$parts[1]; + $this->set_userdata($new_name, $value); + $this->unset_userdata($name); + } + } + } + + // ------------------------------------------------------------------------ + + /** + * Removes all flashdata marked as 'old' + * + * @return void + */ + protected function _flashdata_sweep() + { + $userdata = $this->all_userdata(); + foreach (array_keys($userdata) as $key) + { + if (strpos($key, self::FLASHDATA_OLD)) + { + $this->unset_userdata($key); + } + } + } + + // ------------------------------------------------------------------------ + + /** + * Removes all expired tempdata + * + * @return void + */ + protected function _tempdata_sweep() + { + // Get expirations list + $expirations = $this->userdata(self::EXPIRATION_KEY); + if (empty($expirations)) + { + // Nothing to do + return; + } + + // Unset expired elements + $now = time(); + $userdata = $this->all_userdata(); + foreach (array_keys($userdata) as $key) + { + if (strpos($key, self::FLASHDATA_EXP) && $expirations[$key] < $now) + { + unset($expirations[$key]); + $this->unset_userdata($key); + } + } + + // Update expiration list + $this->set_userdata(self::EXPIRATION_KEY, $expirations); + } + +} + +// ------------------------------------------------------------------------ + +/** + * CI_Session_driver Class + * + * Extend this class to make a new CI_Session driver. + * A CI_Session driver basically manages an array of name/value pairs with some sort of storage mechanism. + * To make a new driver, derive from (extend) CI_Session_driver. Overload the initialize method and read or create + * session data. Then implement a save handler to write changed data to storage (sess_save), a destroy handler + * to remove deleted data (sess_destroy), and an access handler to expose the data (get_userdata). + * Put your driver in the libraries/Session/drivers folder anywhere in the loader paths. This includes the + * application directory, the system directory, or any path you add with $CI->load->add_package_path(). + * Your driver must be named CI_Session_<name>, and your filename must be Session_<name>.php, + * preferably also capitalized. (e.g.: CI_Session_foo in libraries/Session/drivers/Session_foo.php) + * Then specify the driver by setting 'sess_driver' in your config file or as a parameter when loading the CI_Session + * object. (e.g.: $config['sess_driver'] = 'foo'; OR $CI->load->driver('session', array('sess_driver' => 'foo')); ) + * Already provided are the Native driver, which manages the native PHP $_SESSION array, and + * the Cookie driver, which manages the data in a browser cookie, with optional extra storage in a database table. + * + * @package CodeIgniter + * @subpackage Libraries + * @category Sessions + * @author EllisLab Dev Team + */ +abstract class CI_Session_driver extends CI_Driver { + + /** + * Decorate + * + * Decorates the child with the parent driver lib's methods and properties + * + * @param object Parent library object + * @return void + */ + public function decorate($parent) + { + // Call base class decorate first + parent::decorate($parent); + + // Call initialize method now that driver has access to $this->_parent + $this->initialize(); + } + + // ------------------------------------------------------------------------ + + /** + * __call magic method + * + * Handles access to the parent driver library's methods + * + * @param string Library method name + * @param array Method arguments (default: none) + * @return mixed + */ + public function __call($method, $args = array()) + { + // Make sure the parent library uses this driver + $this->_parent->select_driver(get_class($this)); + return parent::__call($method, $args); + } + + // ------------------------------------------------------------------------ + + /** + * Initialize driver + * + * @return void + */ + protected function initialize() + { + // Overload this method to implement initialization + } + + // ------------------------------------------------------------------------ + + /** + * Save the session data + * + * Data in the array has changed - perform any storage synchronization + * necessary. The child class MUST implement this abstract method! + * + * @return void + */ + abstract public function sess_save(); + + // ------------------------------------------------------------------------ + + /** + * Destroy the current session + * + * Clean up storage for this session - it has been terminated. + * The child class MUST implement this abstract method! + * + * @return void + */ + abstract public function sess_destroy(); + + // ------------------------------------------------------------------------ + + /** + * Regenerate the current session + * + * Regenerate the session ID. + * The child class MUST implement this abstract method! + * + * @param bool Destroy session data flag (default: false) + * @return void + */ + abstract public function sess_regenerate($destroy = FALSE); + + // ------------------------------------------------------------------------ + + /** + * Get a reference to user data array + * + * Give array access to the main CI_Session object. + * The child class MUST implement this abstract method! + * + * @return array Reference to userdata + */ + abstract public function &get_userdata(); + +} + +/* End of file Session.php */ +/* Location: ./system/libraries/Session/Session.php */
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