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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_Entry_Abstract
  */
 // require_once 'Zend/Feed/Entry/Abstract.php';
 
 /** @see Zend_Xml_Security */
 // require_once 'Zend/Xml/Security.php';
 
 /**
  * Concrete class for working with Atom entries.
  *
  * @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_Entry_Atom extends Zend_Feed_Entry_Abstract
 {
     /**
      * Content-Type
      */
     const CONTENT_TYPE = 'application/atom+xml';
 
     /**
      * Root XML element for Atom entries.
      *
      * @var string
      */
     protected $_rootElement = 'entry';
 
     /**
      * Root namespace for Atom entries.
      *
      * @var string
      */
     protected $_rootNamespace = 'atom';
 
 
     /**
      * Delete an atom entry.
      *
      * Delete tries to delete this entry from its feed. If the entry
      * does not contain a link rel="edit", we throw an error (either
      * the entry does not yet exist or this is not an editable
      * feed). If we have a link rel="edit", we do the empty-body
      * HTTP DELETE to that URI and check for a response of 2xx.
      * Usually the response would be 204 No Content, but the Atom
      * Publishing Protocol permits it to be 200 OK.
      *
      * @return void
      * @throws Zend_Feed_Exception
      */
     public function delete()
     {
         // Look for link rel="edit" in the entry object.
         $deleteUri = $this->link('edit');
         if (!$deleteUri) {
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('Cannot delete entry; no link rel="edit" is present.');
         }
 
         // DELETE
         $client = Zend_Feed::getHttpClient();
         do {
             $client->setUri($deleteUri);
             if (Zend_Feed::getHttpMethodOverride()) {
                 $client->setHeader('X-HTTP-Method-Override', 'DELETE');
                 $response = $client->request('POST');
             } else {
                 $response = $client->request('DELETE');
             }
             $httpStatus = $response->getStatus();
             switch ((int) $httpStatus / 100) {
                 // Success
                 case 2:
                     return true;
                 // Redirect
                 case 3:
                     $deleteUri = $response->getHeader('Location');
                     continue;
                 // Error
                 default:
                     /**
                      * @see Zend_Feed_Exception
                      */
                     // require_once 'Zend/Feed/Exception.php';
                     throw new Zend_Feed_Exception("Expected response code 2xx, got $httpStatus");
             }
         } while (true);
     }
 
 
     /**
      * Save a new or updated Atom entry.
      *
      * Save is used to either create new entries or to save changes to
      * existing ones. If we have a link rel="edit", we are changing
      * an existing entry. In this case we re-serialize the entry and
      * PUT it to the edit URI, checking for a 200 OK result.
      *
      * For posting new entries, you must specify the $postUri
      * parameter to save() to tell the object where to post itself.
      * We use $postUri and POST the serialized entry there, checking
      * for a 201 Created response. If the insert is successful, we
      * then parse the response from the POST to get any values that
      * the server has generated: an id, an updated time, and its new
      * link rel="edit".
      *
      * @param  string $postUri Location to POST for creating new entries.
      * @return void
      * @throws Zend_Feed_Exception
      */
     public function save($postUri = null)
     {
         if ($this->id()) {
             // If id is set, look for link rel="edit" in the
             // entry object and PUT.
             $editUri = $this->link('edit');
             if (!$editUri) {
                 /**
                  * @see Zend_Feed_Exception
                  */
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Cannot edit entry; no link rel="edit" is present.');
             }
 
             $client = Zend_Feed::getHttpClient();
             $client->setUri($editUri);
             if (Zend_Feed::getHttpMethodOverride()) {
                 $client->setHeaders(array('X-HTTP-Method-Override: PUT',
                     'Content-Type: ' . self::CONTENT_TYPE));
                 $client->setRawData($this->saveXML());
                 $response = $client->request('POST');
             } else {
                 $client->setHeaders('Content-Type', self::CONTENT_TYPE);
                 $client->setRawData($this->saveXML());
                 $response = $client->request('PUT');
             }
             if ($response->getStatus() !== 200) {
                 /**
                  * @see Zend_Feed_Exception
                  */
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Expected response code 200, got ' . $response->getStatus());
             }
         } else {
             if ($postUri === null) {
                 /**
                  * @see Zend_Feed_Exception
                  */
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('PostURI must be specified to save new entries.');
             }
             $client = Zend_Feed::getHttpClient();
             $client->setUri($postUri);
             $client->setHeaders('Content-Type', self::CONTENT_TYPE);
             $client->setRawData($this->saveXML());
             $response = $client->request('POST');
 
             if ($response->getStatus() !== 201) {
                 /**
                  * @see Zend_Feed_Exception
                  */
                 // require_once 'Zend/Feed/Exception.php';
                 throw new Zend_Feed_Exception('Expected response code 201, got '
                                               . $response->getStatus());
             }
         }
 
         // Update internal properties using $client->responseBody;
         @ini_set('track_errors', 1);
         $newEntry = new DOMDocument;
         $newEntry = @Zend_Xml_Security::scan($response->getBody(), $newEntry);
         @ini_restore('track_errors');
 
         if (!$newEntry) {
             // prevent the class to generate an undefined variable notice (ZF-2590)
             if (!isset($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)';
                 }
             }
 
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('XML cannot be parsed: ' . $php_errormsg);
         }
 
         $newEntry = $newEntry->getElementsByTagName($this->_rootElement)->item(0);
         if (!$newEntry) {
             /**
              * @see Zend_Feed_Exception
              */
             // require_once 'Zend/Feed/Exception.php';
             throw new Zend_Feed_Exception('No root <feed> element found in server response:'
                                           . "\n\n" . $client->responseBody);
         }
 
         if ($this->_element->parentNode) {
             $oldElement = $this->_element;
             $this->_element = $oldElement->ownerDocument->importNode($newEntry, true);
             $oldElement->parentNode->replaceChild($this->_element, $oldElement);
         } else {
             $this->_element = $newEntry;
         }
     }
 
 
     /**
      * 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'])) {
                 $link['rel'] = 'alternate'; // see Atom 1.0 spec
             }
             if ($rel == $link['rel']) {
                 return $link['href'];
             }
         }
 
         return null;
     }
 
 }