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<?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 license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Auth
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Auth.php 18039 2009-09-09 03:35:19Z ralph $
*/
/**
* @category Zend
* @package Zend_Auth
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Auth
{
/**
* Singleton instance
*
* @var Zend_Auth
*/
protected static $_instance = null;
/**
* Persistent storage handler
*
* @var Zend_Auth_Storage_Interface
*/
protected $_storage = null;
/**
* Singleton pattern implementation makes "new" unavailable
*
* @return void
*/
protected function __construct()
{}
/**
* Singleton pattern implementation makes "clone" unavailable
*
* @return void
*/
protected function __clone()
{}
/**
* Returns an instance of Zend_Auth
*
* Singleton pattern implementation
*
* @return Zend_Auth Provides a fluent interface
*/
public static function getInstance()
{
if (null === self::$_instance) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Returns the persistent storage handler
*
* Session storage is used by default unless a different storage adapter has been set.
*
* @return Zend_Auth_Storage_Interface
*/
public function getStorage()
{
if (null === $this->_storage) {
/**
* @see Zend_Auth_Storage_Session
*/
require_once 'Zend/Auth/Storage/Session.php';
$this->setStorage(new Zend_Auth_Storage_Session());
}
return $this->_storage;
}
/**
* Sets the persistent storage handler
*
* @param Zend_Auth_Storage_Interface $storage
* @return Zend_Auth Provides a fluent interface
*/
public function setStorage(Zend_Auth_Storage_Interface $storage)
{
$this->_storage = $storage;
return $this;
}
/**
* Authenticates against the supplied adapter
*
* @param Zend_Auth_Adapter_Interface $adapter
* @return Zend_Auth_Result
*/
public function authenticate(Zend_Auth_Adapter_Interface $adapter)
{
$result = $adapter->authenticate();
/**
* ZF-7546 - prevent multiple succesive calls from storing inconsistent results
* Ensure storage has clean state
*/
if ($this->hasIdentity()) {
$this->clearIdentity();
}
if ($result->isValid()) {
$this->getStorage()->write($result->getIdentity());
}
return $result;
}
/**
* Returns true if and only if an identity is available from storage
*
* @return boolean
*/
public function hasIdentity()
{
return !$this->getStorage()->isEmpty();
}
/**
* Returns the identity from storage or null if no identity is available
*
* @return mixed|null
*/
public function getIdentity()
{
$storage = $this->getStorage();
if ($storage->isEmpty()) {
return null;
}
return $storage->read();
}
/**
* Clears the identity from persistent storage
*
* @return void
*/
public function clearIdentity()
{
$this->getStorage()->clear();
}
}
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