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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
  * @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_Abstract
  */
 // require_once 'Zend/Feed/Abstract.php';
 
 /**
  * @see Zend_Feed_Entry_Atom
  */
 // require_once 'Zend/Feed/Entry/Atom.php';
 
 
 /**
  * Atom feed class
  *
  * The Zend_Feed_Atom class is a concrete subclass of the general
  * Zend_Feed_Abstract class, tailored for representing an Atom
  * feed. It shares all of the same methods with its abstract
  * parent. The distinction is made in the format of data that
  * Zend_Feed_Atom expects, and as a further pointer for users as to
  * what kind of feed object they have been passed.
  *
  * @category   Zend
  * @package    Zend_Feed
  * @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_Atom extends Zend_Feed_Abstract
 {
 
     /**
      * The classname for individual feed elements.
      *
      * @var string
      */
     protected $_entryClassName = 'Zend_Feed_Entry_Atom';
 
     /**
      * The element name for individual feed elements (Atom <entry>
      * elements).
      *
      * @var string
      */
     protected $_entryElementName = 'entry';
 
     /**
      * The default namespace for Atom feeds.
      *
      * @var string
      */
     protected $_defaultNamespace = 'atom';
 
 
     /**
      * Override Zend_Feed_Abstract to set up the $_element and $_entries aliases.
      *
      * @return void
      * @throws Zend_Feed_Exception
      */
     public function __wakeup()
     {
         parent::__wakeup();
 
         // Find the base feed element and create an alias to it.
         $element = $this->_element->getElementsByTagName('feed')->item(0);
         if (!$element) {
             // Try to find a single <entry> instead.
             $element = $this->_element->getElementsByTagName($this->_entryElementName)->item(0);
             if (!$element) {
                 /**
                  * @see Zend_Feed_Exception
                  */
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('No root <feed> or <' . $this->_entryElementName
                                               . '> element found, cannot parse feed.');
             }
 
             $doc = new DOMDocument($this->_element->version,
                                    $this->_element->actualEncoding);
             $feed = $doc->appendChild($doc->createElement('feed'));
             $feed->appendChild($doc->importNode($element, true));
             $element = $feed;
         }
 
         $this->_element = $element;
 
         // Find the entries and save a pointer to them for speed and
         // simplicity.
         $this->_buildEntryCache();
     }
 
 
     /**
      * Easy access to <link> tags keyed by "rel" attributes.
      *
      * If $elt->link() is called with no arguments, we will attempt to
      * return the value of the <link> tag(s) like all other
      * method-syntax attribute access. If an argument is passed to
      * link(), however, then we will return the "href" value of the
      * first <link> tag that has a "rel" attribute matching $rel:
      *
      * $elt->link(): returns the value of the link tag.
      * $elt->link('self'): returns the href from the first <link rel="self"> in the entry.
      *
      * @param  string $rel The "rel" attribute to look for.
      * @return mixed
      */
     public function link($rel = null)
     {
         if ($rel === null) {
             return parent::__call('link', null);
         }
 
         // index link tags by their "rel" attribute.
         $links = parent::__get('link');
         if (!is_array($links)) {
             if ($links instanceof Zend_Feed_Element) {
                 $links = array($links);
             } else {
                 return $links;
             }
         }
 
         foreach ($links as $link) {
             if (empty($link['rel'])) {
                 continue;
             }
             if ($rel == $link['rel']) {
                 return $link['href'];
             }
         }
 
         return null;
     }
 
 
     /**
      * Make accessing some individual elements of the feed easier.
      *
      * Special accessors 'entry' and 'entries' are provided so that if
      * you wish to iterate over an Atom feed's entries, you can do so
      * using foreach ($feed->entries as $entry) or foreach
      * ($feed->entry as $entry).
      *
      * @param  string $var The property to access.
      * @return mixed
      */
     public function __get($var)
     {
         switch ($var) {
             case 'entry':
                 // fall through to the next case
             case 'entries':
                 return $this;
 
             default:
                 return parent::__get($var);
         }
     }
 
     /**
      * Generate the header of the feed when working in write mode
      *
      * @param  array $array the data to use
      * @return DOMElement root node
      */
     protected function _mapFeedHeaders($array)
     {
         $feed = $this->_element->createElement('feed');
         $feed->setAttribute('xmlns', 'http://www.w3.org/2005/Atom');
 
         $id = $this->_element->createElement('id', $array->link);
         $feed->appendChild($id);
 
         $title = $this->_element->createElement('title');
         $title->appendChild($this->_element->createCDATASection($array->title));
         $feed->appendChild($title);
 
         if (isset($array->author)) {
             $author = $this->_element->createElement('author');
             $name = $this->_element->createElement('name', $array->author);
             $author->appendChild($name);
             if (isset($array->email)) {
                 $email = $this->_element->createElement('email', $array->email);
                 $author->appendChild($email);
             }
             $feed->appendChild($author);
         }
 
         $updated = isset($array->lastUpdate) ? $array->lastUpdate : time();
         $updated = $this->_element->createElement('updated', date(DATE_ATOM, $updated));
         $feed->appendChild($updated);
 
         if (isset($array->published)) {
             $published = $this->_element->createElement('published', date(DATE_ATOM, $array->published));
             $feed->appendChild($published);
         }
 
         $link = $this->_element->createElement('link');
         $link->setAttribute('rel', 'self');
         $link->setAttribute('href', $array->link);
         if (isset($array->language)) {
             $link->setAttribute('hreflang', $array->language);
         }
         $feed->appendChild($link);
 
         if (isset($array->description)) {
             $subtitle = $this->_element->createElement('subtitle');
             $subtitle->appendChild($this->_element->createCDATASection($array->description));
             $feed->appendChild($subtitle);
         }
 
         if (isset($array->copyright)) {
             $copyright = $this->_element->createElement('rights', $array->copyright);
             $feed->appendChild($copyright);
         }
 
         if (isset($array->image)) {
             $image = $this->_element->createElement('logo', $array->image);
             $feed->appendChild($image);
         }
 
         $generator = !empty($array->generator) ? $array->generator : 'Zend_Feed';
         $generator = $this->_element->createElement('generator', $generator);
         $feed->appendChild($generator);
 
         return $feed;
     }
 
     /**
      * Generate the entries of the feed when working in write mode
      *
      * The following nodes are constructed for each feed entry
      * <entry>
      *    <id>url to feed entry</id>
      *    <title>entry title</title>
      *    <updated>last update</updated>
      *    <link rel="alternate" href="url to feed entry" />
      *    <summary>short text</summary>
      *    <content>long version, can contain html</content>
      * </entry>
      *
      * @param  array      $array the data to use
      * @param  DOMElement $root  the root node to use
      * @return void
      */
     protected function _mapFeedEntries(DOMElement $root, $array)
     {
         foreach ($array as $dataentry) {
             $entry = $this->_element->createElement('entry');
 
             $id = $this->_element->createElement('id', isset($dataentry->guid) ? $dataentry->guid : $dataentry->link);
             $entry->appendChild($id);
 
             $title = $this->_element->createElement('title');
             $title->appendChild($this->_element->createCDATASection($dataentry->title));
             $entry->appendChild($title);
 
             $updated = isset($dataentry->lastUpdate) ? $dataentry->lastUpdate : time();
             $updated = $this->_element->createElement('updated', date(DATE_ATOM, $updated));
             $entry->appendChild($updated);
 
             $link = $this->_element->createElement('link');
             $link->setAttribute('rel', 'alternate');
             $link->setAttribute('href', $dataentry->link);
             $entry->appendChild($link);
 
             $summary = $this->_element->createElement('summary');
             $summary->appendChild($this->_element->createCDATASection($dataentry->description));
             $entry->appendChild($summary);
 
             if (isset($dataentry->content)) {
                 $content = $this->_element->createElement('content');
                 $content->setAttribute('type', 'html');
                 $content->appendChild($this->_element->createCDATASection($dataentry->content));
                 $entry->appendChild($content);
             }
 
             if (isset($dataentry->category)) {
                 foreach ($dataentry->category as $category) {
                     $node = $this->_element->createElement('category');
                     $node->setAttribute('term', $category['term']);
                     if (isset($category['scheme'])) {
                         $node->setAttribute('scheme', $category['scheme']);
                     }
                     $entry->appendChild($node);
                 }
             }
 
             if (isset($dataentry->source)) {
                 $source = $this->_element->createElement('source');
                 $title = $this->_element->createElement('title', $dataentry->source['title']);
                 $source->appendChild($title);
                 $link = $this->_element->createElement('link', $dataentry->source['title']);
                 $link->setAttribute('rel', 'alternate');
                 $link->setAttribute('href', $dataentry->source['url']);
                 $source->appendChild($link);
             }
 
             if (isset($dataentry->enclosure)) {
                 foreach ($dataentry->enclosure as $enclosure) {
                     $node = $this->_element->createElement('link');
                     $node->setAttribute('rel', 'enclosure');
                     $node->setAttribute('href', $enclosure['url']);
                     if (isset($enclosure['type'])) {
                         $node->setAttribute('type', $enclosure['type']);
                     }
                     if (isset($enclosure['length'])) {
                         $node->setAttribute('length', $enclosure['length']);
                     }
                     $entry->appendChild($node);
                 }
             }
 
             if (isset($dataentry->comments)) {
                 $comments = $this->_element->createElementNS('http://wellformedweb.org/CommentAPI/',
                                                              'wfw:comment',
                                                              $dataentry->comments);
                 $entry->appendChild($comments);
             }
             if (isset($dataentry->commentRss)) {
                 $comments = $this->_element->createElementNS('http://wellformedweb.org/CommentAPI/',
                                                              'wfw:commentRss',
                                                              $dataentry->commentRss);
                 $entry->appendChild($comments);
             }
 
             $root->appendChild($entry);
         }
     }
 
     /**
      * Override Zend_Feed_Element to allow formated feeds
      *
      * @return string
      */
     public function saveXml()
     {
         // Return a complete document including XML prologue.
         $doc = new DOMDocument($this->_element->ownerDocument->version,
                                $this->_element->ownerDocument->actualEncoding);
         $doc->appendChild($doc->importNode($this->_element, true));
         $doc->formatOutput = true;
 
         return $doc->saveXML();
     }
 
     /**
      * Send feed to a http client with the correct header
      *
      * @return void
      * @throws Zend_Feed_Exception if headers have already been sent
      */
     public function send()
     {
         if (headers_sent()) {
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('Cannot send ATOM because headers have already been sent.');
         }
 
         header('Content-Type: application/atom+xml; charset=' . $this->_element->ownerDocument->actualEncoding);
 
         echo $this->saveXML();
     }
 }