--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Auth.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,169 @@
+<?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) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Auth.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+
+/**
+ * @category   Zend
+ * @package    Zend_Auth
+ * @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_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();
+    }
+}