--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Service/ShortUrl/AbstractShortener.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,83 @@
+<?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_Service_ShortUrl
+ * @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: $
+ */
+
+/**
+ * @see Zend_Service_Abstract
+ */
+require_once 'Zend/Service/Abstract.php';
+
+/**
+ * @see Zend_Service_ShortUrl_Shortener
+ */
+require_once 'Zend/Service/ShortUrl/Shortener.php';
+
+/**
+ * @category   Zend
+ * @package    Zend_Service_ShortUrl
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+abstract class Zend_Service_ShortUrl_AbstractShortener
+    extends Zend_Service_Abstract 
+    implements Zend_Service_ShortUrl_Shortener
+{
+    /**
+     * Base URI of the service
+     *
+     * @var string
+     */
+    protected $_baseUri = null;
+
+    
+    /**
+     * Checks whether URL to be shortened is valid
+     *
+     * @param string $url
+     * @throws Zend_Service_ShortUrl_Exception When URL is not valid
+     */
+    protected function _validateUri($url)
+    {
+        require_once 'Zend/Uri.php';
+        if (!Zend_Uri::check($url)) {
+            require_once 'Zend/Service/ShortUrl/Exception.php';
+            throw new Zend_Service_ShortUrl_Exception(sprintf(
+                'The url "%s" is not valid and cannot be shortened', $url
+            ));
+        }
+    }
+    
+    /**
+     * Verifies that the URL has been shortened by this service
+     *
+     * @throws Zend_Service_ShortUrl_Exception If the URL hasn't been shortened by this service
+     * @param string $shortenedUrl
+     */
+    protected function _verifyBaseUri($shortenedUrl)
+    {
+        if (strpos($shortenedUrl, $this->_baseUri) !== 0) {
+            require_once 'Zend/Service/ShortUrl/Exception.php';
+            throw new Zend_Service_ShortUrl_Exception(sprintf(
+                'The url "%s" is not valid for this service and the target cannot be resolved',
+                $shortenedUrl
+            ));
+        }
+    }
+}