diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Session/Validator/HttpUserAgent.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Session/Validator/HttpUserAgent.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,66 @@
+<?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_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: HttpUserAgent.php 20096 2010-01-06 02:05:09Z bkarwin $
+ * @since      Preview Release 0.2
+ */
+
+/**
+ * @see Zend_Session_Validator_Abstract
+ */
+require_once 'Zend/Session/Validator/Abstract.php';
+
+/**
+ * Zend_Session_Validator_HttpUserAgent
+ *
+ * @category   Zend
+ * @package    Zend_Session
+ * @subpackage Validator
+ * @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_Validator_HttpUserAgent extends Zend_Session_Validator_Abstract
+{
+
+    /**
+     * Setup() - this method will get the current user agent and store it in the session
+     * as 'valid data'
+     *
+     * @return void
+     */
+    public function setup()
+    {
+        $this->setValidData( (isset($_SERVER['HTTP_USER_AGENT'])
+            ? $_SERVER['HTTP_USER_AGENT'] : null) );
+    }
+
+    /**
+     * Validate() - this method will determine if the current user agent matches the
+     * user agent we stored when we initialized this variable.
+     *
+     * @return bool
+     */
+    public function validate()
+    {
+        $currentBrowser = (isset($_SERVER['HTTP_USER_AGENT'])
+            ? $_SERVER['HTTP_USER_AGENT'] : null);
+
+        return $currentBrowser === $this->getValidData();
+    }
+
+}