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<?php
/**
* CHttpSession class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CHttpSession provides session-level data management and the related configurations.
*
* To start the session, call {@link open()}; To complete and send out session data, call {@link close()};
* To destroy the session, call {@link destroy()}.
*
* If {@link autoStart} is set true, the session will be started automatically
* when the application component is initialized by the application.
*
* CHttpSession can be used like an array to set and get session data. For example,
* <pre>
* $session=new CHttpSession;
* $session->open();
* $value1=$session['name1']; // get session variable 'name1'
* $value2=$session['name2']; // get session variable 'name2'
* foreach($session as $name=>$value) // traverse all session variables
* $session['name3']=$value3; // set session variable 'name3'
* </pre>
*
* The following configurations are available for session:
* <ul>
* <li>{@link setSessionID sessionID};</li>
* <li>{@link setSessionName sessionName};</li>
* <li>{@link autoStart};</li>
* <li>{@link setSavePath savePath};</li>
* <li>{@link setCookieParams cookieParams};</li>
* <li>{@link setGCProbability gcProbability};</li>
* <li>{@link setCookieMode cookieMode};</li>
* <li>{@link setUseTransparentSessionID useTransparentSessionID};</li>
* <li>{@link setTimeout timeout}.</li>
* </ul>
* See the corresponding setter and getter documentation for more information.
* Note, these properties must be set before the session is started.
*
* CHttpSession can be extended to support customized session storage.
* Override {@link openSession}, {@link closeSession}, {@link readSession},
* {@link writeSession}, {@link destroySession} and {@link gcSession}
* and set {@link useCustomStorage} to true.
* Then, the session data will be stored and retrieved using the above methods.
*
* CHttpSession is a Web application component that can be accessed via
* {@link CWebApplication::getSession()}.
*
* @property boolean $useCustomStorage Whether to use custom storage.
* @property boolean $isStarted Whether the session has started.
* @property string $sessionID The current session ID.
* @property string $sessionName The current session name.
* @property string $savePath The current session save path, defaults to {@link http://php.net/session.save_path}.
* @property array $cookieParams The session cookie parameters.
* @property string $cookieMode How to use cookie to store session ID. Defaults to 'Allow'.
* @property float $gCProbability The probability (percentage) that the gc (garbage collection) process is started on every session initialization, defaults to 1 meaning 1% chance.
* @property boolean $useTransparentSessionID Whether transparent sid support is enabled or not, defaults to false.
* @property integer $timeout The number of seconds after which data will be seen as 'garbage' and cleaned up, defaults to 1440 seconds.
* @property CHttpSessionIterator $iterator An iterator for traversing the session variables.
* @property integer $count The number of session variables.
* @property array $keys The list of session variable names.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.web
* @since 1.0
*/
class CHttpSession extends CApplicationComponent implements IteratorAggregate,ArrayAccess,Countable
{
/**
* @var boolean whether the session should be automatically started when the session application component is initialized, defaults to true.
*/
public $autoStart=true;
/**
* @var array Frozen session data
* @since 1.1.20
*/
private $_frozenData;
/**
* Initializes the application component.
* This method is required by IApplicationComponent and is invoked by application.
*/
public function init()
{
parent::init();
if($this->autoStart)
$this->open();
register_shutdown_function(array($this,'close'));
}
/**
* Returns a value indicating whether to use custom session storage.
* This method should be overridden to return true if custom session storage handler should be used.
* If returning true, make sure the methods {@link openSession}, {@link closeSession}, {@link readSession},
* {@link writeSession}, {@link destroySession}, and {@link gcSession} are overridden in child
* class, because they will be used as the callback handlers.
* The default implementation always return false.
* @return boolean whether to use custom storage.
*/
public function getUseCustomStorage()
{
return false;
}
/**
* Starts the session if it has not started yet.
*/
public function open()
{
if($this->getUseCustomStorage())
@session_set_save_handler(array($this,'openSession'),array($this,'closeSession'),array($this,'readSession'),array($this,'writeSession'),array($this,'destroySession'),array($this,'gcSession'));
@session_start();
if(YII_DEBUG && session_id()=='')
{
$message=Yii::t('yii','Failed to start session.');
if(function_exists('error_get_last'))
{
$error=error_get_last();
if(isset($error['message']))
$message=$error['message'];
}
Yii::log($message, CLogger::LEVEL_WARNING, 'system.web.CHttpSession');
}
}
/**
* Ends the current session and store session data.
*/
public function close()
{
if(session_id()!=='')
@session_write_close();
}
/**
* Frees all session variables and destroys all data registered to a session.
*/
public function destroy()
{
if(session_id()!=='')
{
@session_unset();
@session_destroy();
}
}
/**
* @return boolean whether the session has started
*/
public function getIsStarted()
{
if(function_exists('session_status'))
return session_status()===PHP_SESSION_ACTIVE;
return session_id()!=='';
}
/**
* @return string the current session ID
*/
public function getSessionID()
{
return session_id();
}
/**
* @param string $value the session ID for the current session
*/
public function setSessionID($value)
{
session_id($value);
}
/**
* Updates the current session id with a newly generated one .
* Please refer to {@link http://php.net/session_regenerate_id} for more details.
* @param boolean $deleteOldSession Whether to delete the old associated session file or not.
* @since 1.1.8
*/
public function regenerateID($deleteOldSession=false)
{
if($this->getIsStarted())
session_regenerate_id($deleteOldSession);
}
/**
* @return string the current session name
*/
public function getSessionName()
{
return session_name();
}
/**
* @param string $value the session name for the current session, must be an alphanumeric string, defaults to PHPSESSID
*/
public function setSessionName($value)
{
session_name($value);
}
/**
* @return string the current session save path, defaults to {@link http://php.net/session.save_path}.
*/
public function getSavePath()
{
return session_save_path();
}
/**
* @param string $value the current session save path
* @throws CException if the path is not a valid directory
*/
public function setSavePath($value)
{
if(is_dir($value))
session_save_path($value);
else
throw new CException(Yii::t('yii','CHttpSession.savePath "{path}" is not a valid directory.',
array('{path}'=>$value)));
}
/**
* @return array the session cookie parameters.
* @see http://us2.php.net/manual/en/function.session-get-cookie-params.php
*/
public function getCookieParams()
{
return session_get_cookie_params();
}
/**
* Sets the session cookie parameters.
* The effect of this method only lasts for the duration of the script.
* Call this method before the session starts.
* @param array $value cookie parameters, valid keys include: lifetime, path,
* domain, secure, httponly. Note that httponly is all lowercase.
* @see http://us2.php.net/manual/en/function.session-set-cookie-params.php
*/
public function setCookieParams($value)
{
$data=session_get_cookie_params();
extract($data);
extract($value);
if(isset($httponly))
session_set_cookie_params($lifetime,$path,$domain,$secure,$httponly);
else
session_set_cookie_params($lifetime,$path,$domain,$secure);
}
/**
* @return string how to use cookie to store session ID. Defaults to 'Allow'.
*/
public function getCookieMode()
{
if(ini_get('session.use_cookies')==='0')
return 'none';
elseif(ini_get('session.use_only_cookies')==='0')
return 'allow';
else
return 'only';
}
/**
* @param string $value how to use cookie to store session ID. Valid values include 'none', 'allow' and 'only'.
* @throws CException
*/
public function setCookieMode($value)
{
if($value==='none')
{
$this->freeze();
ini_set('session.use_cookies','0');
ini_set('session.use_only_cookies','0');
$this->unfreeze();
}
elseif($value==='allow')
{
$this->freeze();
ini_set('session.use_cookies','1');
ini_set('session.use_only_cookies','0');
$this->unfreeze();
}
elseif($value==='only')
{
$this->freeze();
ini_set('session.use_cookies','1');
ini_set('session.use_only_cookies','1');
$this->unfreeze();
}
else
throw new CException(Yii::t('yii','CHttpSession.cookieMode can only be "none", "allow" or "only".'));
}
/**
* @return float the probability (percentage) that the gc (garbage collection) process is started on every session initialization, defaults to 1 meaning 1% chance.
*/
public function getGCProbability()
{
return (float)(ini_get('session.gc_probability')/ini_get('session.gc_divisor')*100);
}
/**
* @param float $value the probability (percentage) that the gc (garbage collection) process is started on every session initialization.
* @throws CException if the value is beyond [0,100]
*/
public function setGCProbability($value)
{
if($value>=0 && $value<=100)
{
$this->freeze();
// percent * 21474837 / 2147483647 ≈ percent * 0.01
ini_set('session.gc_probability',floor($value*21474836.47));
ini_set('session.gc_divisor',2147483647);
$this->unfreeze();
}
else
throw new CException(Yii::t('yii','CHttpSession.gcProbability "{value}" is invalid. It must be a float between 0 and 100.',
array('{value}'=>$value)));
}
/**
* @return boolean whether transparent sid support is enabled or not, defaults to false.
*/
public function getUseTransparentSessionID()
{
return ini_get('session.use_trans_sid')==1;
}
/**
* @param boolean $value whether transparent sid support is enabled or not.
*/
public function setUseTransparentSessionID($value)
{
ini_set('session.use_trans_sid',$value?'1':'0');
}
/**
* @return integer the number of seconds after which data will be seen as 'garbage' and cleaned up, defaults to 1440 seconds.
*/
public function getTimeout()
{
return (int)ini_get('session.gc_maxlifetime');
}
/**
* @param integer $value the number of seconds after which data will be seen as 'garbage' and cleaned up
*/
public function setTimeout($value)
{
ini_set('session.gc_maxlifetime',$value);
}
/**
* Session open handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @param string $savePath session save path
* @param string $sessionName session name
* @return boolean whether session is opened successfully
*/
public function openSession($savePath,$sessionName)
{
return true;
}
/**
* Session close handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @return boolean whether session is closed successfully
*/
public function closeSession()
{
return true;
}
/**
* Session read handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @param string $id session ID
* @return string the session data
*/
public function readSession($id)
{
return '';
}
/**
* Session write handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @param string $id session ID
* @param string $data session data
* @return boolean whether session write is successful
*/
public function writeSession($id,$data)
{
return true;
}
/**
* Session destroy handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @param string $id session ID
* @return boolean whether session is destroyed successfully
*/
public function destroySession($id)
{
return true;
}
/**
* Session GC (garbage collection) handler.
* This method should be overridden if {@link useCustomStorage} is set true.
* Do not call this method directly.
* @param integer $maxLifetime the number of seconds after which data will be seen as 'garbage' and cleaned up.
* @return boolean whether session is GCed successfully
*/
public function gcSession($maxLifetime)
{
return true;
}
//------ The following methods enable CHttpSession to be CMap-like -----
/**
* Returns an iterator for traversing the session variables.
* This method is required by the interface IteratorAggregate.
* @return CHttpSessionIterator an iterator for traversing the session variables.
*/
public function getIterator()
{
return new CHttpSessionIterator;
}
/**
* Returns the number of items in the session.
* @return integer the number of session variables
*/
public function getCount()
{
return count($_SESSION);
}
/**
* Returns the number of items in the session.
* This method is required by Countable interface.
* @return integer number of items in the session.
*/
public function count()
{
return $this->getCount();
}
/**
* @return array the list of session variable names
*/
public function getKeys()
{
return array_keys($_SESSION);
}
/**
* Returns the session variable value with the session variable name.
* This method is very similar to {@link itemAt} and {@link offsetGet},
* except that it will return $defaultValue if the session variable does not exist.
* @param mixed $key the session variable name
* @param mixed $defaultValue the default value to be returned when the session variable does not exist.
* @return mixed the session variable value, or $defaultValue if the session variable does not exist.
* @since 1.1.2
*/
public function get($key,$defaultValue=null)
{
return isset($_SESSION[$key]) ? $_SESSION[$key] : $defaultValue;
}
/**
* Returns the session variable value with the session variable name.
* This method is exactly the same as {@link offsetGet}.
* @param mixed $key the session variable name
* @return mixed the session variable value, null if no such variable exists
*/
public function itemAt($key)
{
return isset($_SESSION[$key]) ? $_SESSION[$key] : null;
}
/**
* Adds a session variable.
* Note, if the specified name already exists, the old value will be removed first.
* @param mixed $key session variable name
* @param mixed $value session variable value
*/
public function add($key,$value)
{
$_SESSION[$key]=$value;
}
/**
* Removes a session variable.
* @param mixed $key the name of the session variable to be removed
* @return mixed the removed value, null if no such session variable.
*/
public function remove($key)
{
if(isset($_SESSION[$key]))
{
$value=$_SESSION[$key];
unset($_SESSION[$key]);
return $value;
}
else
return null;
}
/**
* Removes all session variables
*/
public function clear()
{
foreach(array_keys($_SESSION) as $key)
unset($_SESSION[$key]);
}
/**
* @param mixed $key session variable name
* @return boolean whether there is the named session variable
*/
public function contains($key)
{
return isset($_SESSION[$key]);
}
/**
* @return array the list of all session variables in array
*/
public function toArray()
{
return $_SESSION;
}
/**
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to check on
* @return boolean
*/
public function offsetExists($offset)
{
return isset($_SESSION[$offset]);
}
/**
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to retrieve element.
* @return mixed the element at the offset, null if no element is found at the offset
*/
public function offsetGet($offset)
{
return isset($_SESSION[$offset]) ? $_SESSION[$offset] : null;
}
/**
* This method is required by the interface ArrayAccess.
* @param integer $offset the offset to set element
* @param mixed $item the element value
*/
public function offsetSet($offset,$item)
{
$_SESSION[$offset]=$item;
}
/**
* This method is required by the interface ArrayAccess.
* @param mixed $offset the offset to unset element
*/
public function offsetUnset($offset)
{
unset($_SESSION[$offset]);
}
/**
* If session is started we cannot edit session ini settings.
* This function save session data to temporary variable and stop session.
*
* @see CHttpSession::unfreeze();
* @since 1.1.20
*/
protected function freeze()
{
if (isset($_SESSION) && $this->getIsStarted())
{
$this->_frozenData = $_SESSION;
$this->close();
}
}
/**
* Start session and restore data from temporary variable
*
* @see CHttpSession::freeze();
* @since 1.1.20
*/
protected function unfreeze()
{
if ($this->_frozenData !== null)
{
@session_start();
$_SESSION = $this->_frozenData;
$this->_frozenData = null;
}
}
/**
* Set cache limiter
*
* @param string $cacheLimiter
* @since 1.1.20
*/
public function setCacheLimiter($cacheLimiter)
{
$this->freeze();
session_cache_limiter($cacheLimiter);
$this->unfreeze();
}
}