File indexing completed on 2024-05-12 06:02:31

 <?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_Reader
  * @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_Feed
  */
 // require_once 'Zend/Feed.php';
 
 /**
  * @see Zend_Feed_Reader_Feed_Rss
  */
 // require_once 'Zend/Feed/Reader/Feed/Rss.php';
 
 /**
  * @see Zend_Feed_Reader_Feed_Atom
  */
 // require_once 'Zend/Feed/Reader/Feed/Atom.php';
 
 /**
  * @see Zend_Feed_Reader_FeedSet
  */
 // require_once 'Zend/Feed/Reader/FeedSet.php';
 
 /** @see Zend_Xml_Security */
 // require_once 'Zend/Xml/Security.php';
 
 /** @see Zend_Xml_Exception */
 // require_once 'Zend/Xml/Exception.php';
 
 /**
  * @category   Zend
  * @package    Zend_Feed_Reader
  * @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_Reader
 {
     /**
      * Namespace constants
      */
     const NAMESPACE_ATOM_03  = 'http://purl.org/atom/ns#';
     const NAMESPACE_ATOM_10  = 'http://www.w3.org/2005/Atom';
     const NAMESPACE_RDF      = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
     const NAMESPACE_RSS_090  = 'http://my.netscape.com/rdf/simple/0.9/';
     const NAMESPACE_RSS_10   = 'http://purl.org/rss/1.0/';
 
     /**
      * Feed type constants
      */
     const TYPE_ANY              = 'any';
     const TYPE_ATOM_03          = 'atom-03';
     const TYPE_ATOM_10          = 'atom-10';
     const TYPE_ATOM_10_ENTRY    = 'atom-10-entry';
     const TYPE_ATOM_ANY         = 'atom';
     const TYPE_RSS_090          = 'rss-090';
     const TYPE_RSS_091          = 'rss-091';
     const TYPE_RSS_091_NETSCAPE = 'rss-091n';
     const TYPE_RSS_091_USERLAND = 'rss-091u';
     const TYPE_RSS_092          = 'rss-092';
     const TYPE_RSS_093          = 'rss-093';
     const TYPE_RSS_094          = 'rss-094';
     const TYPE_RSS_10           = 'rss-10';
     const TYPE_RSS_20           = 'rss-20';
     const TYPE_RSS_ANY          = 'rss';
 
     /**
      * Cache instance
      *
      * @var Zend_Cache_Core
      */
     protected static $_cache = null;
 
     /**
      * HTTP client object to use for retrieving feeds
      *
      * @var Zend_Http_Client
      */
     protected static $_httpClient = null;
 
     /**
      * Override HTTP PUT and DELETE request methods?
      *
      * @var boolean
      */
     protected static $_httpMethodOverride = false;
 
     protected static $_httpConditionalGet = false;
 
     protected static $_pluginLoader = null;
 
     protected static $_prefixPaths = array();
 
     protected static $_extensions = array(
         'feed' => array(
             'DublinCore_Feed',
             'Atom_Feed'
         ),
         'entry' => array(
             'Content_Entry',
             'DublinCore_Entry',
             'Atom_Entry'
         ),
         'core' => array(
             'DublinCore_Feed',
             'Atom_Feed',
             'Content_Entry',
             'DublinCore_Entry',
             'Atom_Entry'
         )
     );
 
     /**
      * Get the Feed cache
      *
      * @return Zend_Cache_Core
      */
     public static function getCache()
     {
         return self::$_cache;
     }
 
     /**
      * Set the feed cache
      *
      * @param Zend_Cache_Core $cache
      * @return void
      */
     public static function setCache(Zend_Cache_Core $cache)
     {
         self::$_cache = $cache;
     }
 
     /**
      * Set the HTTP client instance
      *
      * Sets the HTTP client object to use for retrieving the feeds.
      *
      * @param  Zend_Http_Client $httpClient
      * @return void
      */
     public static function setHttpClient(Zend_Http_Client $httpClient)
     {
         self::$_httpClient = $httpClient;
     }
 
 
     /**
      * Gets the HTTP client object. If none is set, a new Zend_Http_Client will be used.
      *
      * @return Zend_Http_Client_Abstract
      */
     public static function getHttpClient()
     {
         if (!self::$_httpClient instanceof Zend_Http_Client) {
             /**
              * @see Zend_Http_Client
              */
             // require_once 'Zend/Http/Client.php';
             self::$_httpClient = new Zend_Http_Client();
         }
 
         return self::$_httpClient;
     }
 
     /**
      * Toggle using POST instead of PUT and DELETE HTTP methods
      *
      * Some feed implementations do not accept PUT and DELETE HTTP
      * methods, or they can't be used because of proxies or other
      * measures. This allows turning on using POST where PUT and
      * DELETE would normally be used; in addition, an
      * X-Method-Override header will be sent with a value of PUT or
      * DELETE as appropriate.
      *
      * @param  boolean $override Whether to override PUT and DELETE.
      * @return void
      */
     public static function setHttpMethodOverride($override = true)
     {
         self::$_httpMethodOverride = $override;
     }
 
     /**
      * Get the HTTP override state
      *
      * @return boolean
      */
     public static function getHttpMethodOverride()
     {
         return self::$_httpMethodOverride;
     }
 
     /**
      * Set the flag indicating whether or not to use HTTP conditional GET
      *
      * @param  bool $bool
      * @return void
      */
     public static function useHttpConditionalGet($bool = true)
     {
         self::$_httpConditionalGet = $bool;
     }
 
     /**
      * Import a feed by providing a URL
      *
      * @param  string $url The URL to the feed
      * @param  string $etag OPTIONAL Last received ETag for this resource
      * @param  string $lastModified OPTIONAL Last-Modified value for this resource
      * @return Zend_Feed_Reader_FeedInterface
      */
     public static function import($uri, $etag = null, $lastModified = null)
     {
         $cache       = self::getCache();
         $feed        = null;
         $responseXml = '';
         $client      = self::getHttpClient();
         $client->resetParameters();
         $client->setHeaders('If-None-Match', null);
         $client->setHeaders('If-Modified-Since', null);
         $client->setUri($uri);
         $cacheId = 'Zend_Feed_Reader_' . md5($uri);
 
         if (self::$_httpConditionalGet && $cache) {
             $data = $cache->load($cacheId);
             if ($data) {
                 if ($etag === null) {
                     $etag = $cache->load($cacheId.'_etag');
                 }
                 if ($lastModified === null) {
                     $lastModified = $cache->load($cacheId.'_lastmodified');
                 }
                 if ($etag) {
                     $client->setHeaders('If-None-Match', $etag);
                 }
                 if ($lastModified) {
                     $client->setHeaders('If-Modified-Since', $lastModified);
                 }
             }
             $response = $client->request('GET');
             if ($response->getStatus() !== 200 && $response->getStatus() !== 304) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got response code ' . $response->getStatus());
             }
             if ($response->getStatus() == 304) {
                 $responseXml = $data;
             } else {
                 $responseXml = $response->getBody();
                 $cache->save($responseXml, $cacheId);
                 if ($response->getHeader('ETag')) {
                     $cache->save($response->getHeader('ETag'), $cacheId.'_etag');
                 }
                 if ($response->getHeader('Last-Modified')) {
                     $cache->save($response->getHeader('Last-Modified'), $cacheId.'_lastmodified');
                 }
             }
             if (empty($responseXml)) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got empty response body');
             }
             return self::importString($responseXml);
         } elseif ($cache) {
             $data = $cache->load($cacheId);
             if ($data !== false) {
                 return self::importString($data);
             }
             $response = $client->request('GET');
             if ($response->getStatus() !== 200) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got response code ' . $response->getStatus());
             }
             $responseXml = $response->getBody();
             $cache->save($responseXml, $cacheId);
             if (empty($responseXml)) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got empty response body');
             }
             return self::importString($responseXml);
         } else {
             $response = $client->request('GET');
             if ($response->getStatus() !== 200) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got response code ' . $response->getStatus());
             }
             $responseXml = $response->getBody();
             if (empty($responseXml)) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Feed failed to load, got empty response body');
             }
             $reader = self::importString($responseXml);
             $reader->setOriginalSourceUri($uri);
             return $reader;
         }
     }
 
     /**
      * Import a feed by providing a Zend_Feed_Abstract object
      *
      * @param  Zend_Feed_Abstract $feed A fully instantiated Zend_Feed object
      * @return Zend_Feed_Reader_FeedInterface
      */
     public static function importFeed(Zend_Feed_Abstract $feed)
     {
         $dom  = $feed->getDOM()->ownerDocument;
         $type = self::detectType($dom);
         self::_registerCoreExtensions();
         if (substr($type, 0, 3) == 'rss') {
             $reader = new Zend_Feed_Reader_Feed_Rss($dom, $type);
         } else {
             $reader = new Zend_Feed_Reader_Feed_Atom($dom, $type);
         }
 
         return $reader;
     }
 
     /**
      * Import a feed from a string
      *
      * @param  string $string
      * @return Zend_Feed_Reader_FeedInterface
      */
     public static function importString($string)
     {
         $dom = new DOMDocument;
         try {
             $dom = Zend_Xml_Security::scan($string, $dom);        
         } catch (Zend_Xml_Exception $e) {    
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception(
                 $e->getMessage()
             );
         }
         if (!$dom) {
             // Build error message
             $error = libxml_get_last_error();
             if ($error && $error->message) {
                 $errormsg = "DOMDocument cannot parse XML: {$error->message}";
             } else {
                 $errormsg = "DOMDocument cannot parse XML: Please check the XML document's validity";
             }
 
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception($errormsg);
         }
 
         $type = self::detectType($dom);
 
         self::_registerCoreExtensions();
 
         if (substr($type, 0, 3) == 'rss') {
             $reader = new Zend_Feed_Reader_Feed_Rss($dom, $type);
         } elseif (substr($type, 8, 5) == 'entry') {
             $reader = new Zend_Feed_Reader_Entry_Atom($dom->documentElement, 0, Zend_Feed_Reader::TYPE_ATOM_10);
         } elseif (substr($type, 0, 4) == 'atom') {
             $reader = new Zend_Feed_Reader_Feed_Atom($dom, $type);
         } else {
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('The URI used does not point to a '
             . 'valid Atom, RSS or RDF feed that Zend_Feed_Reader can parse.');
         }
         return $reader;
     }
 
     /**
      * Imports a feed from a file located at $filename.
      *
      * @param  string $filename
      * @throws Zend_Feed_Exception
      * @return Zend_Feed_Reader_FeedInterface
      */
     public static function importFile($filename)
     {
         @ini_set('track_errors', 1);
         $feed = @file_get_contents($filename);
         @ini_restore('track_errors');
         if ($feed === false) {
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception("File could not be loaded: $php_errormsg");
         }
         return self::importString($feed);
     }
 
     public static function findFeedLinks($uri)
     {
         // Get the HTTP response from $uri and save the contents
         $client = self::getHttpClient();
         $client->setUri($uri);
         $response = $client->request();
         if ($response->getStatus() !== 200) {
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception("Failed to access $uri, got response code " . $response->getStatus());
         }
         $responseHtml = $response->getBody();
         $libxml_errflag = libxml_use_internal_errors(true);
         $oldValue = libxml_disable_entity_loader(true);
         $dom = new DOMDocument;
         $status = $dom->loadHTML($responseHtml);
         libxml_disable_entity_loader($oldValue);
         libxml_use_internal_errors($libxml_errflag);
         if (!$status) {
             // Build error message
             $error = libxml_get_last_error();
             if ($error && $error->message) {
                 $errormsg = "DOMDocument cannot parse HTML: {$error->message}";
             } else {
                 $errormsg = "DOMDocument cannot parse HTML: Please check the XML document's validity";
             }
 
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception($errormsg);
         }
         $feedSet = new Zend_Feed_Reader_FeedSet;
         $links = $dom->getElementsByTagName('link');
         $feedSet->addLinks($links, $uri);
         return $feedSet;
     }
 
     /**
      * Detect the feed type of the provided feed
      *
      * @param  Zend_Feed_Abstract|DOMDocument|string $feed
      * @param  bool                                  $specOnly
      * @return string
      * @throws Zend_Feed_Exception
      */
     public static function detectType($feed, $specOnly = false)
     {
         if ($feed instanceof Zend_Feed_Reader_FeedInterface) {
             $dom = $feed->getDomDocument();
         } elseif($feed instanceof DOMDocument) {
             $dom = $feed;
         } elseif(is_string($feed) && !empty($feed)) {
             @ini_set('track_errors', 1);
             //$oldValue = libxml_disable_entity_loader(true);
             $dom = new DOMDocument;
             try {
                 $dom = Zend_Xml_Security::scan($feed, $dom);
             } catch (Zend_Xml_Exception $e) {
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception(
                     $e->getMessage()
                 );
             }
             //libxml_disable_entity_loader($oldValue);
             @ini_restore('track_errors');
             if (!$dom) {
                 if (!isset($php_errormsg)) {
                     if (function_exists('xdebug_is_enabled')) {
                         $php_errormsg = '(error message not available, when XDebug is running)';
                     } else {
                         $php_errormsg = '(error message not available)';
                     }
                 }
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception("DOMDocument cannot parse XML: $php_errormsg");
             }
         } else {
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('Invalid object/scalar provided: must'
             . ' be of type Zend_Feed_Reader_FeedInterface, DomDocument or string');
         }
         $xpath = new DOMXPath($dom);
 
         if ($xpath->query('/rss')->length) {
             $type = self::TYPE_RSS_ANY;
             $version = $xpath->evaluate('string(/rss/@version)');
 
             if (strlen($version) > 0) {
                 switch($version) {
                     case '2.0':
                         $type = self::TYPE_RSS_20;
                         break;
 
                     case '0.94':
                         $type = self::TYPE_RSS_094;
                         break;
 
                     case '0.93':
                         $type = self::TYPE_RSS_093;
                         break;
 
                     case '0.92':
                         $type = self::TYPE_RSS_092;
                         break;
 
                     case '0.91':
                         $type = self::TYPE_RSS_091;
                         break;
                 }
             }
 
             return $type;
         }
 
         $xpath->registerNamespace('rdf', self::NAMESPACE_RDF);
 
         if ($xpath->query('/rdf:RDF')->length) {
             $xpath->registerNamespace('rss', self::NAMESPACE_RSS_10);
 
             if ($xpath->query('/rdf:RDF/rss:channel')->length
                 || $xpath->query('/rdf:RDF/rss:image')->length
                 || $xpath->query('/rdf:RDF/rss:item')->length
                 || $xpath->query('/rdf:RDF/rss:textinput')->length
             ) {
                 return self::TYPE_RSS_10;
             }
 
             $xpath->registerNamespace('rss', self::NAMESPACE_RSS_090);
 
             if ($xpath->query('/rdf:RDF/rss:channel')->length
                 || $xpath->query('/rdf:RDF/rss:image')->length
                 || $xpath->query('/rdf:RDF/rss:item')->length
                 || $xpath->query('/rdf:RDF/rss:textinput')->length
             ) {
                 return self::TYPE_RSS_090;
             }
         }
 
         $type = self::TYPE_ATOM_ANY;
         $xpath->registerNamespace('atom', self::NAMESPACE_ATOM_10);
 
         if ($xpath->query('//atom:feed')->length) {
             return self::TYPE_ATOM_10;
         }
 
         if ($xpath->query('//atom:entry')->length) {
             if ($specOnly == true) {
                 return self::TYPE_ATOM_10;
             } else {
                 return self::TYPE_ATOM_10_ENTRY;
             }
         }
 
         $xpath->registerNamespace('atom', self::NAMESPACE_ATOM_03);
 
         if ($xpath->query('//atom:feed')->length) {
             return self::TYPE_ATOM_03;
         }
 
         return self::TYPE_ANY;
     }
 
     /**
      * Set plugin loader for use with Extensions
      *
      * @param  Zend_Loader_PluginLoader_Interface $loader
      */
     public static function setPluginLoader(Zend_Loader_PluginLoader_Interface $loader)
     {
         self::$_pluginLoader = $loader;
     }
 
     /**
      * Get plugin loader for use with Extensions
      *
      * @return  Zend_Loader_PluginLoader_Interface $loader
      */
     public static function getPluginLoader()
     {
         if (!isset(self::$_pluginLoader)) {
             // require_once 'Zend/Loader/PluginLoader.php';
             self::$_pluginLoader = new Zend_Loader_PluginLoader(array(
                 'Zend_Feed_Reader_Extension_' => 'Zend/Feed/Reader/Extension/',
             ));
         }
         return self::$_pluginLoader;
     }
 
     /**
      * Add prefix path for loading Extensions
      *
      * @param  string $prefix
      * @param  string $path
      * @return void
      */
     public static function addPrefixPath($prefix, $path)
     {
         $prefix = rtrim($prefix, '_');
         $path   = rtrim($path, DIRECTORY_SEPARATOR);
         self::getPluginLoader()->addPrefixPath($prefix, $path);
     }
 
     /**
      * Add multiple Extension prefix paths at once
      *
      * @param  array $spec
      * @return void
      */
     public static function addPrefixPaths(array $spec)
     {
         if (isset($spec['prefix']) && isset($spec['path'])) {
             self::addPrefixPath($spec['prefix'], $spec['path']);
         }
         foreach ($spec as $prefixPath) {
             if (isset($prefixPath['prefix']) && isset($prefixPath['path'])) {
                 self::addPrefixPath($prefixPath['prefix'], $prefixPath['path']);
             }
         }
     }
 
     /**
      * Register an Extension by name
      *
      * @param  string $name
      * @return void
      * @throws Zend_Feed_Exception if unable to resolve Extension class
      */
     public static function registerExtension($name)
     {
         $feedName  = $name . '_Feed';
         $entryName = $name . '_Entry';
         if (self::isRegistered($name)) {
             if (self::getPluginLoader()->isLoaded($feedName) ||
                 self::getPluginLoader()->isLoaded($entryName)) {
                 return;
             }
         }
         try {
             self::getPluginLoader()->load($feedName);
             self::$_extensions['feed'][] = $feedName;
         } catch (Zend_Loader_PluginLoader_Exception $e) {
         }
         try {
             self::getPluginLoader()->load($entryName);
             self::$_extensions['entry'][] = $entryName;
         } catch (Zend_Loader_PluginLoader_Exception $e) {
         }
         if (!self::getPluginLoader()->isLoaded($feedName)
             && !self::getPluginLoader()->isLoaded($entryName)
         ) {
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('Could not load extension: ' . $name
                 . 'using Plugin Loader. Check prefix paths are configured and extension exists.');
         }
     }
 
     /**
      * Is a given named Extension registered?
      *
      * @param  string $extensionName
      * @return boolean
      */
     public static function isRegistered($extensionName)
     {
         $feedName  = $extensionName . '_Feed';
         $entryName = $extensionName . '_Entry';
         if (in_array($feedName, self::$_extensions['feed'])
             || in_array($entryName, self::$_extensions['entry'])
         ) {
             return true;
         }
         return false;
     }
 
     /**
      * Get a list of extensions
      *
      * @return array
      */
     public static function getExtensions()
     {
         return self::$_extensions;
     }
 
     /**
      * Reset class state to defaults
      *
      * @return void
      */
     public static function reset()
     {
         self::$_cache              = null;
         self::$_httpClient         = null;
         self::$_httpMethodOverride = false;
         self::$_httpConditionalGet = false;
         self::$_pluginLoader       = null;
         self::$_prefixPaths        = array();
         self::$_extensions         = array(
             'feed' => array(
                 'DublinCore_Feed',
                 'Atom_Feed'
             ),
             'entry' => array(
                 'Content_Entry',
                 'DublinCore_Entry',
                 'Atom_Entry'
             ),
             'core' => array(
                 'DublinCore_Feed',
                 'Atom_Feed',
                 'Content_Entry',
                 'DublinCore_Entry',
                 'Atom_Entry'
             )
         );
     }
 
     /**
      * Register core (default) extensions
      *
      * @return void
      */
     protected static function _registerCoreExtensions()
     {
         self::registerExtension('DublinCore');
         self::registerExtension('Content');
         self::registerExtension('Atom');
         self::registerExtension('Slash');
         self::registerExtension('WellFormedWeb');
         self::registerExtension('Thread');
         self::registerExtension('Podcast');
     }
 
     /**
      * Utility method to apply array_unique operation to a multidimensional
      * array.
      *
      * @param array
      * @return array
      */
     public static function arrayUnique(array $array)
     {
         foreach ($array as &$value) {
             $value = serialize($value);
         }
         $array = array_unique($array);
         foreach ($array as &$value) {
             $value = unserialize($value);
         }
         return $array;
     }
 
 }