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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_Feed_Pubsubhubbub
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Http_Client
  */
 // require_once 'Zend/Http/Client.php';
 
 /**
  * @see Zend_Uri
  */
 // require_once 'Zend/Uri.php';
 
 /**
  * @see Zend_Version
  */
 // require_once 'Zend/Version.php';
 
 /**
  * @see Zend_Feed_Reader
  */
 // require_once 'Zend/Feed/Reader.php';
 
 /**
  * @see Zend_Feed_Abstract
  */
 // require_once 'Zend/Feed/Abstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Feed_Pubsubhubbub
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Feed_Pubsubhubbub
 {
     /**
      * Verification Modes
      */
     const VERIFICATION_MODE_SYNC  = 'sync';
     const VERIFICATION_MODE_ASYNC = 'async';
 
     /**
      * Subscription States
      */
     const SUBSCRIPTION_VERIFIED    = 'verified';
     const SUBSCRIPTION_NOTVERIFIED = 'not_verified';
     const SUBSCRIPTION_TODELETE    = 'to_delete';
 
     /**
      * Singleton instance if required of the HTTP client
      *
      * @var Zend_Http_Client
      */
     protected static $httpClient = null;
 
     /**
      * Simple utility function which imports any feed URL and
      * determines the existence of Hub Server endpoints. This works
      * best if directly given an instance of Zend_Feed_Reader_Atom|Rss
      * to leverage off.
      *
      * @param  Zend_Feed_Reader_FeedAbstract|Zend_Feed_Abstract|string $source
      * @return array
      */
     public static function detectHubs($source)
     {
         if (is_string($source)) {
             $feed = Zend_Feed_Reader::import($source);
         } elseif (is_object($source) && $source instanceof Zend_Feed_Reader_FeedAbstract) {
             $feed = $source;
         } elseif (is_object($source) && $source instanceof Zend_Feed_Abstract) {
             $feed = Zend_Feed_Reader::importFeed($source);
         } else {
             // require_once 'Zend/Feed/Pubsubhubbub/Exception.php';
             throw new Zend_Feed_Pubsubhubbub_Exception('The source parameter was'
             . ' invalid, i.e. not a URL string or an instance of type'
             . ' Zend_Feed_Reader_FeedAbstract or Zend_Feed_Abstract');
         }
         return $feed->getHubs();
     }
 
     /**
      * Allows the external environment to make Zend_Oauth use a specific
      * Client instance.
      *
      * @param  Zend_Http_Client $httpClient
      * @return void
      */
     public static function setHttpClient(Zend_Http_Client $httpClient)
     {
         self::$httpClient = $httpClient;
     }
 
     /**
      * Return the singleton instance of the HTTP Client. Note that
      * the instance is reset and cleared of previous parameters GET/POST.
      * Headers are NOT reset but handled by this component if applicable.
      *
      * @return Zend_Http_Client
      */
     public static function getHttpClient()
     {
         if (!isset(self::$httpClient)):
             self::$httpClient = new Zend_Http_Client;
         else:
             self::$httpClient->resetParameters();
         endif;
         return self::$httpClient;
     }
 
     /**
      * Simple mechanism to delete the entire singleton HTTP Client instance
      * which forces an new instantiation for subsequent requests.
      *
      * @return void
      */
     public static function clearHttpClient()
     {
         self::$httpClient = null;
     }
 
     /**
      * RFC 3986 safe url encoding method
      *
      * @param  string $string
      * @return string
      */
     public static function urlencode($string)
     {
         $rawencoded = rawurlencode($string);
         $rfcencoded = str_replace('%7E', '~', $rawencoded);
         return $rfcencoded;
     }
 }