Chris@0: <?php
Chris@0: /**
Chris@0:  * Zend Framework (http://framework.zend.com/)
Chris@0:  *
Chris@0:  * @link      http://github.com/zendframework/zf2 for the canonical source repository
Chris@0:  * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
Chris@0:  * @license   http://framework.zend.com/license/new-bsd New BSD License
Chris@0:  */
Chris@0: 
Chris@0: namespace Zend\Feed\Reader;
Chris@0: 
Chris@0: use ArrayObject;
Chris@0: use DOMNodeList;
Chris@0: use Zend\Feed\Uri;
Chris@0: 
Chris@0: class FeedSet extends ArrayObject
Chris@0: {
Chris@0:     public $rss = null;
Chris@0: 
Chris@0:     public $rdf = null;
Chris@0: 
Chris@0:     public $atom = null;
Chris@0: 
Chris@0:     /**
Chris@0:      * Import a DOMNodeList from any document containing a set of links
Chris@0:      * for alternate versions of a document, which will normally refer to
Chris@0:      * RSS/RDF/Atom feeds for the current document.
Chris@0:      *
Chris@0:      * All such links are stored internally, however the first instance of
Chris@0:      * each RSS, RDF or Atom type has its URI stored as a public property
Chris@0:      * as a shortcut where the use case is simply to get a quick feed ref.
Chris@0:      *
Chris@0:      * Note that feeds are not loaded at this point, but will be lazy
Chris@0:      * loaded automatically when each links 'feed' array key is accessed.
Chris@0:      *
Chris@0:      * @param DOMNodeList $links
Chris@0:      * @param string $uri
Chris@0:      * @return void
Chris@0:      */
Chris@0:     public function addLinks(DOMNodeList $links, $uri)
Chris@0:     {
Chris@0:         foreach ($links as $link) {
Chris@0:             if (strtolower($link->getAttribute('rel')) !== 'alternate'
Chris@2:                 || ! $link->getAttribute('type') || ! $link->getAttribute('href')) {
Chris@0:                 continue;
Chris@0:             }
Chris@2:             if (! isset($this->rss) && $link->getAttribute('type') == 'application/rss+xml') {
Chris@0:                 $this->rss = $this->absolutiseUri(trim($link->getAttribute('href')), $uri);
Chris@2:             } elseif (! isset($this->atom) && $link->getAttribute('type') == 'application/atom+xml') {
Chris@0:                 $this->atom = $this->absolutiseUri(trim($link->getAttribute('href')), $uri);
Chris@2:             } elseif (! isset($this->rdf) && $link->getAttribute('type') == 'application/rdf+xml') {
Chris@0:                 $this->rdf = $this->absolutiseUri(trim($link->getAttribute('href')), $uri);
Chris@0:             }
Chris@0:             $this[] = new static([
Chris@0:                 'rel' => 'alternate',
Chris@0:                 'type' => $link->getAttribute('type'),
Chris@0:                 'href' => $this->absolutiseUri(trim($link->getAttribute('href')), $uri),
Chris@2:                 'title' => $link->getAttribute('title'),
Chris@0:             ]);
Chris@0:         }
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      *  Attempt to turn a relative URI into an absolute URI
Chris@2:      *
Chris@2:      *  @param string $link
Chris@2:      *  @param string $uri OPTIONAL
Chris@2:      *  @return string|null absolutised link or null if invalid
Chris@0:      */
Chris@0:     protected function absolutiseUri($link, $uri = null)
Chris@0:     {
Chris@0:         $linkUri = Uri::factory($link);
Chris@2:         if ($linkUri->isAbsolute()) {
Chris@2:             // invalid absolute link can not be recovered
Chris@2:             return $linkUri->isValid() ? $link : null;
Chris@2:         }
Chris@0: 
Chris@2:         $scheme = 'http';
Chris@2:         if ($uri !== null) {
Chris@2:             $uri = Uri::factory($uri);
Chris@2:             $scheme = $uri->getScheme() ?: $scheme;
Chris@2:         }
Chris@0: 
Chris@2:         if ($linkUri->getHost()) {
Chris@2:             $link = $this->resolveSchemeRelativeUri($link, $scheme);
Chris@2:         } elseif ($uri !== null) {
Chris@2:             $link = $this->resolveRelativeUri($link, $scheme, $uri->getHost(), $uri->getPath());
Chris@2:         }
Chris@0: 
Chris@2:         if (! Uri::factory($link)->isValid()) {
Chris@2:             return null;
Chris@0:         }
Chris@2: 
Chris@0:         return $link;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@2:      * Resolves scheme relative link to absolute
Chris@2:      *
Chris@2:      * @param string $link
Chris@2:      * @param string $scheme
Chris@2:      * @return string
Chris@2:      */
Chris@2:     private function resolveSchemeRelativeUri($link, $scheme)
Chris@2:     {
Chris@2:         $link = ltrim($link, '/');
Chris@2:         return sprintf('%s://%s', $scheme, $link);
Chris@2:     }
Chris@2: 
Chris@2:     /**
Chris@2:      *  Resolves relative link to absolute
Chris@2:      *
Chris@2:      *  @param string $link
Chris@2:      *  @param string $scheme
Chris@2:      *  @param string $host
Chris@2:      *  @param string $uriPath
Chris@2:      *  @return string
Chris@2:      */
Chris@2:     private function resolveRelativeUri($link, $scheme, $host, $uriPath)
Chris@2:     {
Chris@2:         if ($link[0] !== '/') {
Chris@2:             $link = $uriPath . '/' . $link;
Chris@2:         }
Chris@2:         return sprintf(
Chris@2:             '%s://%s/%s',
Chris@2:             $scheme,
Chris@2:             $host,
Chris@2:             $this->canonicalizePath($link)
Chris@2:         );
Chris@2:     }
Chris@2: 
Chris@2:     /**
Chris@0:      *  Canonicalize relative path
Chris@0:      */
Chris@0:     protected function canonicalizePath($path)
Chris@0:     {
Chris@0:         $parts = array_filter(explode('/', $path));
Chris@0:         $absolutes = [];
Chris@0:         foreach ($parts as $part) {
Chris@0:             if ('.' == $part) {
Chris@0:                 continue;
Chris@0:             }
Chris@0:             if ('..' == $part) {
Chris@0:                 array_pop($absolutes);
Chris@0:             } else {
Chris@0:                 $absolutes[] = $part;
Chris@0:             }
Chris@0:         }
Chris@0:         return implode('/', $absolutes);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Supports lazy loading of feeds using Reader::import() but
Chris@0:      * delegates any other operations to the parent class.
Chris@0:      *
Chris@0:      * @param string $offset
Chris@0:      * @return mixed
Chris@0:      */
Chris@0:     public function offsetGet($offset)
Chris@0:     {
Chris@2:         if ($offset == 'feed' && ! $this->offsetExists('feed')) {
Chris@2:             if (! $this->offsetExists('href')) {
Chris@0:                 return;
Chris@0:             }
Chris@0:             $feed = Reader::import($this->offsetGet('href'));
Chris@0:             $this->offsetSet('feed', $feed);
Chris@0:             return $feed;
Chris@0:         }
Chris@0:         return parent::offsetGet($offset);
Chris@0:     }
Chris@0: }