1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

     7  * This source file is subject to the new BSD license that is bundled

     8  * with this package in the file LICENSE.txt.

     9  * It is also available through the world-wide-web at this URL:

    10  * http://framework.zend.com/license/new-bsd

    11  * If you did not receive a copy of the license and are unable to

    12  * obtain it through the world-wide-web, please send an email

    13  * to license@zend.com so we can send you a copy immediately.

    14  *

    15  * @category   Zend

    16  * @package    Zend_Feed_Reader

    17  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    18  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    19  * @version    $Id: FeedSet.php 22662 2010-07-24 17:37:36Z mabe $

    20  */

    21 

    22 /**

    23  * @see Zend_Feed_Reader

    24  */

    25 require_once 'Zend/Feed/Reader.php';

    26 

    27 /**

    28  * @see Zend_Uri

    29  */

    30 require_once 'Zend/Uri.php';

    31 

    32 /**

    33  * @category   Zend

    34  * @package    Zend_Feed_Reader

    35  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    36  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    37  */

    38 class Zend_Feed_Reader_FeedSet extends ArrayObject

    39 {

    40 

    41     public $rss = null;

    42 

    43     public $rdf = null;

    44 

    45     public $atom = null;

    46 

    47     /**

    48      * Import a DOMNodeList from any document containing a set of links

    49      * for alternate versions of a document, which will normally refer to

    50      * RSS/RDF/Atom feeds for the current document.

    51      *

    52      * All such links are stored internally, however the first instance of

    53      * each RSS, RDF or Atom type has its URI stored as a public property

    54      * as a shortcut where the use case is simply to get a quick feed ref.

    55      *

    56      * Note that feeds are not loaded at this point, but will be lazy

    57      * loaded automatically when each links 'feed' array key is accessed.

    58      *

    59      * @param DOMNodeList $links

    60      * @param string $uri

    61      * @return void

    62      */

    63     public function addLinks(DOMNodeList $links, $uri)

    64     {

    65         foreach ($links as $link) {

    66             if (strtolower($link->getAttribute('rel')) !== 'alternate'

    67                 || !$link->getAttribute('type') || !$link->getAttribute('href')) {

    68                 continue;

    69             }

    70             if (!isset($this->rss) && $link->getAttribute('type') == 'application/rss+xml') {

    71                 $this->rss = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

    72             } elseif(!isset($this->atom) && $link->getAttribute('type') == 'application/atom+xml') {

    73                 $this->atom = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

    74             } elseif(!isset($this->rdf) && $link->getAttribute('type') == 'application/rdf+xml') {

    75                 $this->rdf = $this->_absolutiseUri(trim($link->getAttribute('href')), $uri);

    76             }

    77             $this[] = new self(array(

    78                 'rel' => 'alternate',

    79                 'type' => $link->getAttribute('type'),

    80                 'href' => $this->_absolutiseUri(trim($link->getAttribute('href')), $uri),

    81             ));

    82         }

    83     }

    84     

    85     /**

    86      *  Attempt to turn a relative URI into an absolute URI

    87      */

    88     protected function _absolutiseUri($link, $uri = null)

    89     {

    90         if (!Zend_Uri::check($link)) {

    91             if ($uri !== null) {

    92                 $uri = Zend_Uri::factory($uri);

    93 

    94                 if ($link[0] !== '/') {

    95                     $link = $uri->getPath() . '/' . $link;

    96                 }

    97 

    98                 $link = $uri->getScheme() . '://' . $uri->getHost() . '/' . $this->_canonicalizePath($link);

    99                 if (!Zend_Uri::check($link)) {

   100                     $link = null;

   101                 }

   102             }

   103         }

   104         return $link;

   105     }

   106     

   107     /**

   108      *  Canonicalize relative path

   109      */

   110     protected function _canonicalizePath($path)

   111     {

   112         $parts = array_filter(explode('/', $path));

   113         $absolutes = array();

   114         foreach ($parts as $part) {

   115             if ('.' == $part) {

   116                 continue;

   117             }

   118             if ('..' == $part) {

   119                 array_pop($absolutes);

   120             } else {

   121                 $absolutes[] = $part;

   122             }

   123         }

   124         return implode('/', $absolutes);

   125     }

   126 

   127     /**

   128      * Supports lazy loading of feeds using Zend_Feed_Reader::import() but

   129      * delegates any other operations to the parent class.

   130      *

   131      * @param string $offset

   132      * @return mixed

   133      * @uses Zend_Feed_Reader

   134      */

   135     public function offsetGet($offset)

   136     {

   137         if ($offset == 'feed' && !$this->offsetExists('feed')) {

   138             if (!$this->offsetExists('href')) {

   139                 return null;

   140             }

   141             $feed = Zend_Feed_Reader::import($this->offsetGet('href'));

   142             $this->offsetSet('feed', $feed);

   143             return $feed;

   144         }

   145         return parent::offsetGet($offset);

   146     }

   147 

   148 }