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yelirekim/Zend_Session.php

Created December 20, 2010 08:59
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Zend_Session.php
<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* 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 [email protected] so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Session
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Session.php 22587 2010-07-16 20:14:18Z ralph $
* @since Preview Release 0.2
*/
/**
* @see Zend_Session_Abstract
*/
require_once 'Zend/Session/Abstract.php';
/**
* @see Zend_Session_Namespace
*/
require_once 'Zend/Session/Namespace.php';
/**
* @see Zend_Session_SaveHandler_Interface
*/
require_once 'Zend/Session/SaveHandler/Interface.php';
/**
* Zend_Session
*
* @category Zend
* @package Zend_Session
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Session extends Zend_Session_Abstract
{
/**
* Whether or not Zend_Session is being used with unit tests
*
* @internal
* @var bool
*/
public static $_unitTestEnabled = false;
/**
* $_throwStartupException
*
* @var bool|bitset This could also be a combiniation of error codes to catch
*/
protected static $_throwStartupExceptions = true;
/**
* Check whether or not the session was started
*
* @var bool
*/
private static $_sessionStarted = false;
/**
* Whether or not the session id has been regenerated this request.
*
* Id regeneration state
* <0 - regenerate requested when session is started
* 0 - do nothing
* >0 - already called session_regenerate_id()
*
* @var int
*/
private static $_regenerateIdState = 0;
/**
* Private list of php's ini values for ext/session
* null values will default to the php.ini value, otherwise
* the value below will overwrite the default ini value, unless
* the user has set an option explicity with setOptions()
*
* @var array
*/
private static $_defaultOptions = array(
'save_path' => null,
'name' => null, /* this should be set to a unique value for each application */
'save_handler' => null,
//'auto_start' => null, /* intentionally excluded (see manual) */
'gc_probability' => null,
'gc_divisor' => null,
'gc_maxlifetime' => null,
'serialize_handler' => null,
'cookie_lifetime' => null,
'cookie_path' => null,
'cookie_domain' => null,
'cookie_secure' => null,
'cookie_httponly' => null,
'use_cookies' => null,
'use_only_cookies' => 'on',
'referer_check' => null,
'entropy_file' => null,
'entropy_length' => null,
'cache_limiter' => null,
'cache_expire' => null,
'use_trans_sid' => null,
'bug_compat_42' => null,
'bug_compat_warn' => null,
'hash_function' => null,
'hash_bits_per_character' => null
);
/**
* List of options pertaining to Zend_Session that can be set by developers
* using Zend_Session::setOptions(). This list intentionally duplicates
* the individual declaration of static "class" variables by the same names.
*
* @var array
*/
private static $_localOptions = array(
'strict' => '_strict',
'remember_me_seconds' => '_rememberMeSeconds',
'throw_startup_exceptions' => '_throwStartupExceptions'
);
/**
* Whether or not write close has been performed.
*
* @var bool
*/
private static $_writeClosed = false;
/**
* Whether or not session id cookie has been deleted
*
* @var bool
*/
private static $_sessionCookieDeleted = false;
/**
* Whether or not session has been destroyed via session_destroy()
*
* @var bool
*/
private static $_destroyed = false;
/**
* Whether or not session must be initiated before usage
*
* @var bool
*/
private static $_strict = false;
/**
* Default number of seconds the session will be remembered for when asked to be remembered
*
* @var int
*/
private static $_rememberMeSeconds = 1209600; // 2 weeks
/**
* Whether the default options listed in Zend_Session::$_localOptions have been set
*
* @var bool
*/
private static $_defaultOptionsSet = false;
/**
* A reference to the set session save handler
*
* @var Zend_Session_SaveHandler_Interface
*/
private static $_saveHandler = null;
/**
* Constructor overriding - make sure that a developer cannot instantiate
*/
protected function __construct()
{
}
/**
* setOptions - set both the class specified
*
* @param array $userOptions - pass-by-keyword style array of <option name, option value> pairs
* @throws Zend_Session_Exception
* @return void
*/
public static function setOptions(array $userOptions = array())
{
// set default options on first run only (before applying user settings)
if (!self::$_defaultOptionsSet) {
foreach (self::$_defaultOptions as $defaultOptionName => $defaultOptionValue) {
if (isset(self::$_defaultOptions[$defaultOptionName])) {
ini_set("session.$defaultOptionName", $defaultOptionValue);
}
}
self::$_defaultOptionsSet = true;
}
// set the options the user has requested to set
foreach ($userOptions as $userOptionName => $userOptionValue) {
$userOptionName = strtolower($userOptionName);
// set the ini based values
if (array_key_exists($userOptionName, self::$_defaultOptions)) {
ini_set("session.$userOptionName", $userOptionValue);
}
elseif (isset(self::$_localOptions[$userOptionName])) {
self::${self::$_localOptions[$userOptionName]} = $userOptionValue;
}
else {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception("Unknown option: $userOptionName = $userOptionValue");
}
}
}
/**
* getOptions()
*
* @param string $optionName OPTIONAL
* @return array|string
*/
public static function getOptions($optionName = null)
{
$options = array();
foreach (ini_get_all('session') as $sysOptionName => $sysOptionValues) {
$options[substr($sysOptionName, 8)] = $sysOptionValues['local_value'];
}
foreach (self::$_localOptions as $localOptionName => $localOptionMemberName) {
$options[$localOptionName] = self::${$localOptionMemberName};
}
if ($optionName) {
if (array_key_exists($optionName, $options)) {
return $options[$optionName];
}
return null;
}
return $options;
}
/**
* setSaveHandler() - Session Save Handler assignment
*
* @param Zend_Session_SaveHandler_Interface $interface
* @return void
*/
public static function setSaveHandler(Zend_Session_SaveHandler_Interface $saveHandler)
{
self::$_saveHandler = $saveHandler;
if (self::$_unitTestEnabled) {
return;
}
session_set_save_handler(
array(&$saveHandler, 'open'),
array(&$saveHandler, 'close'),
array(&$saveHandler, 'read'),
array(&$saveHandler, 'write'),
array(&$saveHandler, 'destroy'),
array(&$saveHandler, 'gc')
);
}
/**
* getSaveHandler() - Get the session Save Handler
*
* @return Zend_Session_SaveHandler_Interface
*/
public static function getSaveHandler()
{
return self::$_saveHandler;
}
/**
* regenerateId() - Regenerate the session id. Best practice is to call this after
* session is started. If called prior to session starting, session id will be regenerated
* at start time.
*
* @throws Zend_Session_Exception
* @return void
*/
public static function regenerateId()
{
if (!self::$_unitTestEnabled && headers_sent($filename, $linenum)) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception("You must call " . __CLASS__ . '::' . __FUNCTION__ .
"() before any output has been sent to the browser; output started in {$filename}/{$linenum}");
}
if (self::$_sessionStarted && self::$_regenerateIdState <= 0) {
if (!self::$_unitTestEnabled) {
session_regenerate_id(true);
}
self::$_regenerateIdState = 1;
} else {
/**
* @todo If we can detect that this requester had no session previously,
* then why regenerate the id before the session has started?
* Feedback wanted for:
//
if (isset($_COOKIE[session_name()]) || (!use only cookies && isset($_REQUEST[session_name()]))) {
self::$_regenerateIdState = 1;
} else {
self::$_regenerateIdState = -1;
}
//*/
self::$_regenerateIdState = -1;
}
}
/**
* rememberMe() - Write a persistent cookie that expires after a number of seconds in the future. If no number of
* seconds is specified, then this defaults to self::$_rememberMeSeconds. Due to clock errors on end users' systems,
* large values are recommended to avoid undesirable expiration of session cookies.
*
* @param $seconds integer - OPTIONAL specifies TTL for cookie in seconds from present time
* @return void
*/
public static function rememberMe($seconds = null)
{
$seconds = (int) $seconds;
$seconds = ($seconds > 0) ? $seconds : self::$_rememberMeSeconds;
self::rememberUntil($seconds);
}
/**
* forgetMe() - Write a volatile session cookie, removing any persistent cookie that may have existed. The session
* would end upon, for example, termination of a web browser program.
*
* @return void
*/
public static function forgetMe()
{
self::rememberUntil(0);
}
/**
* rememberUntil() - This method does the work of changing the state of the session cookie and making
* sure that it gets resent to the browser via regenerateId()
*
* @param int $seconds
* @return void
*/
public static function rememberUntil($seconds = 0)
{
if (self::$_unitTestEnabled) {
self::regenerateId();
return;
}
$cookieParams = session_get_cookie_params();
session_set_cookie_params(
$seconds,
$cookieParams['path'],
$cookieParams['domain'],
$cookieParams['secure']
);
// normally "rememberMe()" represents a security context change, so should use new session id
self::regenerateId();
}
/**
* sessionExists() - whether or not a session exists for the current request
*
* @return bool
*/
public static function sessionExists()
{
if (ini_get('session.use_cookies') == '1' && isset($_COOKIE[session_name()])) {
return true;
} elseif (!empty($_REQUEST[session_name()])) {
return true;
} elseif (self::$_unitTestEnabled) {
return true;
}
return false;
}
/**
* Whether or not session has been destroyed via session_destroy()
*
* @return bool
*/
public static function isDestroyed()
{
return self::$_destroyed;
}
/**
* start() - Start the session.
*
* @param bool|array $options OPTIONAL Either user supplied options, or flag indicating if start initiated automatically
* @throws Zend_Session_Exception
* @return void
*/
public static function start($options = false)
{
if (self::$_sessionStarted && self::$_destroyed) {
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception('The session was explicitly destroyed during this request, attempting to re-start is not allowed.');
}
if (self::$_sessionStarted) {
return; // already started
}
// make sure our default options (at the least) have been set
if (!self::$_defaultOptionsSet) {
self::setOptions(is_array($options) ? $options : array());
}
// In strict mode, do not allow auto-starting Zend_Session, such as via "new Zend_Session_Namespace()"
if (self::$_strict && $options === true) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception('You must explicitly start the session with Zend_Session::start() when session options are set to strict.');
}
$filename = $linenum = null;
if (!self::$_unitTestEnabled && headers_sent($filename, $linenum)) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception("Session must be started before any output has been sent to the browser;"
. " output started in {$filename}/{$linenum}");
}
// See http://www.php.net/manual/en/ref.session.php for explanation
if (!self::$_unitTestEnabled && defined('SID')) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception('session has already been started by session.auto-start or session_start()');
}
/**
* Hack to throw exceptions on start instead of php errors
* @see http://framework.zend.com/issues/browse/ZF-1325
*/
$errorLevel = (is_int(self::$_throwStartupExceptions)) ? self::$_throwStartupExceptions : E_ALL;
/** @see Zend_Session_Exception */
if (!self::$_unitTestEnabled) {
if (self::$_throwStartupExceptions) {
require_once 'Zend/Session/Exception.php';
set_error_handler(array('Zend_Session_Exception', 'handleSessionStartError'), $errorLevel);
}
$startedCleanly = session_start();
if (self::$_throwStartupExceptions) {
restore_error_handler();
}
if (!$startedCleanly || Zend_Session_Exception::$sessionStartError != null) {
if (self::$_throwStartupExceptions) {
set_error_handler(array('Zend_Session_Exception', 'handleSilentWriteClose'), $errorLevel);
}
session_write_close();
if (self::$_throwStartupExceptions) {
restore_error_handler();
throw new Zend_Session_Exception(__CLASS__ . '::' . __FUNCTION__ . '() - ' . Zend_Session_Exception::$sessionStartError);
}
}
}
parent::$_readable = true;
parent::$_writable = true;
self::$_sessionStarted = true;
if (self::$_regenerateIdState === -1) {
self::regenerateId();
}
// run validators if they exist
if (isset($_SESSION['__ZF']['VALID'])) {
self::_processValidators();
}
self::_processStartupMetadataGlobal();
}
/**
* _processGlobalMetadata() - this method initizes the sessions GLOBAL
* metadata, mostly global data expiration calculations.
*
* @return void
*/
private static function _processStartupMetadataGlobal()
{
// process global metadata
if (isset($_SESSION['__ZF'])) {
// expire globally expired values
foreach ($_SESSION['__ZF'] as $namespace => $namespace_metadata) {
// Expire Namespace by Time (ENT)
if (isset($namespace_metadata['ENT']) && ($namespace_metadata['ENT'] > 0) && (time() > $namespace_metadata['ENT']) ) {
unset($_SESSION[$namespace]);
unset($_SESSION['__ZF'][$namespace]);
}
// Expire Namespace by Global Hop (ENGH) if it wasnt expired above
if (isset($_SESSION['__ZF'][$namespace]) && isset($namespace_metadata['ENGH']) && $namespace_metadata['ENGH'] >= 1) {
$_SESSION['__ZF'][$namespace]['ENGH']--;
if ($_SESSION['__ZF'][$namespace]['ENGH'] === 0) {
if (isset($_SESSION[$namespace])) {
parent::$_expiringData[$namespace] = $_SESSION[$namespace];
unset($_SESSION[$namespace]);
}
unset($_SESSION['__ZF'][$namespace]);
}
}
// Expire Namespace Variables by Time (ENVT)
if (isset($namespace_metadata['ENVT'])) {
foreach ($namespace_metadata['ENVT'] as $variable => $time) {
if (time() > $time) {
unset($_SESSION[$namespace][$variable]);
unset($_SESSION['__ZF'][$namespace]['ENVT'][$variable]);
}
}
if (empty($_SESSION['__ZF'][$namespace]['ENVT'])) {
unset($_SESSION['__ZF'][$namespace]['ENVT']);
}
}
// Expire Namespace Variables by Global Hop (ENVGH)
if (isset($namespace_metadata['ENVGH'])) {
foreach ($namespace_metadata['ENVGH'] as $variable => $hops) {
$_SESSION['__ZF'][$namespace]['ENVGH'][$variable]--;
if ($_SESSION['__ZF'][$namespace]['ENVGH'][$variable] === 0) {
if (isset($_SESSION[$namespace][$variable])) {
parent::$_expiringData[$namespace][$variable] = $_SESSION[$namespace][$variable];
unset($_SESSION[$namespace][$variable]);
}
unset($_SESSION['__ZF'][$namespace]['ENVGH'][$variable]);
}
}
if (empty($_SESSION['__ZF'][$namespace]['ENVGH'])) {
unset($_SESSION['__ZF'][$namespace]['ENVGH']);
}
}
}
if (isset($namespace) && empty($_SESSION['__ZF'][$namespace])) {
unset($_SESSION['__ZF'][$namespace]);
}
}
if (isset($_SESSION['__ZF']) && empty($_SESSION['__ZF'])) {
unset($_SESSION['__ZF']);
}
}
/**
* isStarted() - convenience method to determine if the session is already started.
*
* @return bool
*/
public static function isStarted()
{
return self::$_sessionStarted;
}
/**
* isRegenerated() - convenience method to determine if session_regenerate_id()
* has been called during this request by Zend_Session.
*
* @return bool
*/
public static function isRegenerated()
{
return ( (self::$_regenerateIdState > 0) ? true : false );
}
/**
* getId() - get the current session id
*
* @return string
*/
public static function getId()
{
return session_id();
}
/**
* setId() - set an id to a user specified id
*
* @throws Zend_Session_Exception
* @param string $id
* @return void
*/
public static function setId($id)
{
if (!self::$_unitTestEnabled && defined('SID')) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception('The session has already been started. The session id must be set first.');
}
if (!self::$_unitTestEnabled && headers_sent($filename, $linenum)) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception("You must call ".__CLASS__.'::'.__FUNCTION__.
"() before any output has been sent to the browser; output started in {$filename}/{$linenum}");
}
if (!is_string($id) || $id === '') {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception('You must provide a non-empty string as a session identifier.');
}
session_id($id);
}
/**
* registerValidator() - register a validator that will attempt to validate this session for
* every future request
*
* @param Zend_Session_Validator_Interface $validator
* @return void
*/
public static function registerValidator(Zend_Session_Validator_Interface $validator)
{
$validator->setup();
}
/**
* stop() - Disable write access. Optionally disable read (not implemented).
*
* @return void
*/
public static function stop()
{
parent::$_writable = false;
}
/**
* writeClose() - Shutdown the sesssion, close writing and detach $_SESSION from the back-end storage mechanism.
* This will complete the internal data transformation on this request.
*
* @param bool $readonly - OPTIONAL remove write access (i.e. throw error if Zend_Session's attempt writes)
* @return void
*/
public static function writeClose($readonly = true)
{
if (self::$_unitTestEnabled) {
return;
}
if (self::$_writeClosed) {
return;
}
if ($readonly) {
parent::$_writable = false;
}
session_write_close();
self::$_writeClosed = true;
}
/**
* destroy() - This is used to destroy session data, and optionally, the session cookie itself
*
* @param bool $remove_cookie - OPTIONAL remove session id cookie, defaults to true (remove cookie)
* @param bool $readonly - OPTIONAL remove write access (i.e. throw error if Zend_Session's attempt writes)
* @return void
*/
public static function destroy($remove_cookie = true, $readonly = true)
{
if (self::$_unitTestEnabled) {
return;
}
if (self::$_destroyed) {
return;
}
if ($readonly) {
parent::$_writable = false;
}
session_destroy();
self::$_destroyed = true;
if ($remove_cookie) {
self::expireSessionCookie();
}
}
/**
* expireSessionCookie() - Sends an expired session id cookie, causing the client to delete the session cookie
*
* @return void
*/
public static function expireSessionCookie()
{
if (self::$_unitTestEnabled) {
return;
}
if (self::$_sessionCookieDeleted) {
return;
}
self::$_sessionCookieDeleted = true;
if (isset($_COOKIE[session_name()])) {
$cookie_params = session_get_cookie_params();
setcookie(
session_name(),
false,
315554400, // strtotime('1980-01-01'),
$cookie_params['path'],
$cookie_params['domain'],
$cookie_params['secure']
);
}
}
/**
* _processValidator() - internal function that is called in the existence of VALID metadata
*
* @throws Zend_Session_Exception
* @return void
*/
private static function _processValidators()
{
foreach ($_SESSION['__ZF']['VALID'] as $validator_name => $valid_data) {
if (!class_exists($validator_name)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($validator_name);
}
$validator = new $validator_name;
if ($validator->validate() === false) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception("This session is not valid according to {$validator_name}.");
}
}
}
/**
* namespaceIsset() - check to see if a namespace is set
*
* @param string $namespace
* @return bool
*/
public static function namespaceIsset($namespace)
{
return parent::_namespaceIsset($namespace);
}
/**
* namespaceUnset() - unset a namespace or a variable within a namespace
*
* @param string $namespace
* @throws Zend_Session_Exception
* @return void
*/
public static function namespaceUnset($namespace)
{
parent::_namespaceUnset($namespace);
Zend_Session_Namespace::resetSingleInstance($namespace);
}
/**
* namespaceGet() - get all variables in a namespace
* Deprecated: Use getIterator() in Zend_Session_Namespace.
*
* @param string $namespace
* @return array
*/
public static function namespaceGet($namespace)
{
return parent::_namespaceGetAll($namespace);
}
/**
* getIterator() - return an iteratable object for use in foreach and the like,
* this completes the IteratorAggregate interface
*
* @throws Zend_Session_Exception
* @return ArrayObject
*/
public static function getIterator()
{
if (parent::$_readable === false) {
/** @see Zend_Session_Exception */
require_once 'Zend/Session/Exception.php';
throw new Zend_Session_Exception(parent::_THROW_NOT_READABLE_MSG);
}
$spaces = array();
if (isset($_SESSION)) {
$spaces = array_keys($_SESSION);
foreach($spaces as $key => $space) {
if (!strncmp($space, '__', 2) || !is_array($_SESSION[$space])) {
unset($spaces[$key]);
}
}
}
return new ArrayObject(array_merge($spaces, array_keys(parent::$_expiringData)));
}
/**
* isWritable() - returns a boolean indicating if namespaces can write (use setters)
*
* @return bool
*/
public static function isWritable()
{
return parent::$_writable;
}
/**
* isReadable() - returns a boolean indicating if namespaces can write (use setters)
*
* @return bool
*/
public static function isReadable()
{
return parent::$_readable;
}
}
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