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<?php |
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/** |
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* class FeedFinder: find likely feeds using autodetection and/or guesswork |
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* @version 2010.0622 |
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* @uses SimplePie_Misc |
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*/ |
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|
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if (!class_exists('SimplePie')) : |
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require_once(ABSPATH . WPINC . '/class-simplepie.php'); |
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endif; |
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require_once(dirname(__FILE__).'/feedwordpresshtml.class.php'); |
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|
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class FeedFinder { |
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var $uri = NULL; |
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var $_cache_uri = NULL; |
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|
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var $verify = FALSE; |
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var $fallbacks = 3; |
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|
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var $_response = NULL; |
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var $_data = NULL; |
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var $_error = NULL; |
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var $_head = NULL; |
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|
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# -- Recognition patterns |
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var $_feed_types = array( |
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'application/rss+xml', |
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'text/xml', |
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'application/atom+xml', |
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'application/x.atom+xml', |
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'application/x-atom+xml' |
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); |
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var $_feed_markers = array('\\<feed', '\\<rss', 'xmlns="http://purl.org/rss/1.0'); |
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var $_html_markers = array('\\<html'); |
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var $_opml_markers = array('\\<opml', '\\<outline'); |
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var $_obvious_feed_url = array('[./]rss', '[./]rdf', '[./]atom', '[./]feed', '\.xml'); |
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var $_maybe_feed_url = array ('rss', 'rdf', 'atom', 'feed', 'xml'); |
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|
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function FeedFinder ($uri = NULL, $verify = TRUE, $fallbacks = 3) { |
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$this->uri = $uri; $this->verify = $verify; |
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$this->fallbacks = $fallbacks; |
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} /* FeedFinder::FeedFinder () */ |
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|
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function find ($uri = NULL) { |
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$ret = array (); |
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if (!is_null($this->data($uri))) : |
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if ($this->is_opml($uri)) : |
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$href = $this->_opml_rss_uris(); |
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else : |
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if ($this->is_feed($uri)) : |
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$href = array($this->uri); |
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else : |
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// Assume that we have HTML or XHTML (even if we don't, who's it gonna hurt?) |
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// Autodiscovery is the preferred method |
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$href = $this->_link_rel_feeds(); |
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|
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// ... but we'll also take the little orange buttons |
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if ($this->fallbacks > 0) : |
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$href = array_merge($href, $this->_a_href_feeds(TRUE)); |
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endif; |
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|
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// If all that failed, look harder |
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if ($this->fallbacks > 1) : |
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if (count($href) == 0) : |
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$href = $this->_a_href_feeds(FALSE); |
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endif; |
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endif; |
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|
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// Our search may turn up duplicate URIs. We only need to do any given URI once. |
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// Props to Camilo <http://projects.radgeek.com/2008/12/14/feedwordpress-20081214/#comment-20090122160414> |
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$href = array_unique($href); |
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endif; |
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|
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// Try some clever URL little tricks before we go |
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if ($this->fallbacks > 2) : |
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$href = array_merge($href, $this->_url_manipulation_feeds()); |
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endif; |
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endif; |
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|
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$href = array_unique($href); |
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|
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// Verify feeds and resolve relative URIs |
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foreach ($href as $u) : |
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$the_uri = SimplePie_Misc::absolutize_url($u, $this->uri); |
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if ($this->verify and ($u != $this->uri and $the_uri != $this->uri)) : |
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$feed = new FeedFinder($the_uri); |
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if ($feed->is_feed()) : $ret[] = $the_uri; endif; |
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unset($feed); |
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else : |
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$ret[] = $the_uri; |
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endif; |
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endforeach; |
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endif; |
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|
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return array_values($ret); |
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} /* FeedFinder::find () */ |
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|
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function data ($uri = NULL) { |
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$this->_get($uri); |
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return $this->_data; |
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} /* FeedFinder::data () */ |
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|
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function upload_data ($data) { |
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$this->uri = 'tag:localhost'; |
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$this->_data = $data; |
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} /* FeedFinder::upload_data () */ |
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|
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function status ($uri = NULL) { |
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$this->_get($uri); |
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|
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if (!is_wp_error($this->_response) and isset($this->_response['response']['code'])) : |
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$ret = $this->_response['response']['code']; |
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else : |
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$ret = NULL; |
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endif; |
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return $ret; |
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} |
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|
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function error ($index = NULL) { |
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$message = NULL; |
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if (count($this->_error) > 0) : |
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if (is_scalar($index) and !is_null($index)) : |
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$message = $this->_error[$index]; |
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else : |
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$message = implode(" / ", $this->_error)."\n"; |
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endif; |
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endif; |
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return $message; |
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} |
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|
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function is_feed ($uri = NULL) { |
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$data = $this->data($uri); |
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|
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return ( |
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preg_match ( |
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"\007(".implode('|',$this->_feed_markers).")\007i", |
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$data |
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) and !preg_match ( |
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"\007(".implode('|',$this->_html_markers).")\007i", |
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$data |
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) |
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); |
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} /* FeedFinder::is_feed () */ |
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|
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function is_opml ($uri = NULL) { |
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$data = $this->data($uri); |
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return ( |
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preg_match ( |
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"\007(".implode('|',$this->_opml_markers).")\007i", |
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$data |
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) |
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); |
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} /* FeedFinder::is_opml () */ |
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|
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# --- Private methods --- |
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function _get ($uri = NULL) { |
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if ($uri) $this->uri = $uri; |
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|
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// Is the result not yet cached? |
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if ($this->uri != 'tag:localhost' and $this->_cache_uri !== $this->uri) : |
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$headers['Connection'] = 'close'; |
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$headers['Accept'] = 'application/atom+xml application/rdf+xml application/rss+xml application/xml text/html */*'; |
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$headers['User-Agent'] = 'feedfinder/1.2 (compatible; PHP FeedFinder) +http://projects.radgeek.com/feedwordpress'; |
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|
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// Use WordPress API function |
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$client = wp_remote_request($this->uri, array( |
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'headers' => $headers, |
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'timeout' => FeedWordPress::fetch_timeout(), |
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)); |
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|
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$this->_response = $client; |
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if (is_wp_error($client)) : |
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$this->_data = NULL; |
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$this->_error = $client->get_error_messages(); |
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else : |
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$this->_data = $client['body']; |
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$this->_error = NULL; |
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endif; |
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|
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// Kilroy was here |
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$this->_cache_uri = $this->uri; |
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endif; |
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} /* FeedFinder::_get () */ |
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|
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function _opml_rss_uris () { |
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// Really we should parse the XML and use the structure to |
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// return something intelligent to programs that want to use it |
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// Oh babe! maybe some day... |
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|
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$opml = $this->data(); |
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|
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$rx = FeedWordPressHTML::attributeRegex('outline', 'xmlUrl'); |
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if (preg_match_all($rx, $opml, $matches, PREG_SET_ORDER)) : |
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foreach ($matches as $m) : |
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$match = FeedWordPressHTML::attributeMatch($m); |
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$r[] = $match['value']; |
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endforeach; |
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endif; |
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return $r; |
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} /* FeedFinder::_opml_rss_uris () */ |
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|
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function _link_rel_feeds () { |
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$links = $this->_tags('link'); |
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$link_count = count($links); |
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|
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// now figure out which one points to the RSS file |
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$href = array (); |
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for ($n=0; $n<$link_count; $n++) { |
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if (strtolower($links[$n]['rel']) == 'alternate') { |
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if (in_array(strtolower($links[$n]['type']), $this->_feed_types)) { |
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$href[] = $links[$n]['href']; |
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} /* if */ |
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} /* if */ |
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} /* for */ |
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return $href; |
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} /* FeedFinder::_link_rel_feeds () */ |
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|
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function _a_href_feeds ($obvious = TRUE) { |
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$pattern = ($obvious ? $this->_obvious_feed_url : $this->_maybe_feed_url); |
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|
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$links = $this->_tags('a'); |
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$link_count = count($links); |
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|
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// now figure out which one points to the RSS file |
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$href = array (); |
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for ($n=0; $n<$link_count; $n++) { |
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if (preg_match("\007(".implode('|',$pattern).")\007i", $links[$n]['href'])) { |
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$href[] = $links[$n]['href']; |
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} /* if */ |
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} /* for */ |
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return $href; |
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} /* FeedFinder::_link_a_href_feeds () */ |
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|
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function _url_manipulation_feeds () { |
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$href = array(); |
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|
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// check for HTTP GET parameters that look feed-like. |
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$bits = parse_url($this->uri); |
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foreach (array('rss', 'rss2', 'atom', 'rdf') as $format) : |
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if (isset($bits['query']) and (strlen($bits['query']) > 0)) : |
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$newQuery = preg_replace('/([?&=])(rss2?|atom|rdf)/i', '$1'.$format, $bits['query']); |
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else : |
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$newQuery = NULL; |
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endif; |
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|
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if (isset($bits['path']) and (strlen($bits['path']) > 0)) : |
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$newPath = preg_replace('!([/.])(rss2?|atom|rdf)!i', '$1'.$format, $bits['path']); |
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else : |
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$newPath = NULL; |
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endif; |
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|
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// Reassemble, check and return |
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$credentials = ''; |
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if (isset($bits['user'])) : |
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$credentials = $bits['user']; |
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if (isset($bits['pass'])) : |
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$credentials .= ':'.$bits['pass']; |
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endif; |
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$credentials .= '@'; |
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endif; |
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|
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// Variations on a theme |
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$newUrl[0] = ('' |
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.(isset($bits['scheme']) ? $bits['scheme'].':' : '') |
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.(isset($bits['host']) ? '//'.$credentials.$bits['host'] : '') |
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.(!is_null($newPath) ? $newPath : '') |
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.(!is_null($newQuery) ? '?'.$newQuery : '') |
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.(isset($bits['fragment']) ? '#'.$bits['fragment'] : '') |
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); |
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$newUrl[1] = ('' |
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.(isset($bits['scheme']) ? $bits['scheme'].':' : '') |
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.(isset($bits['host']) ? '//'.$credentials.$bits['host'] : '') |
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.(!is_null($newPath) ? $newPath : '') |
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.(isset($bits['query']) ? '?'.$bits['query'] : '') |
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.(isset($bits['fragment']) ? '#'.$bits['fragment'] : '') |
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); |
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$newUrl[2] = ('' |
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.(isset($bits['scheme']) ? $bits['scheme'].':' : '') |
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.(isset($bits['host']) ? '//'.$credentials.$bits['host'] : '') |
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.(isset($bits['path']) ? $bits['path'] : '') |
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.(!is_null($newQuery) ? '?'.$newQuery : '') |
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.(isset($bits['fragment']) ? '#'.$bits['fragment'] : '') |
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); |
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$href = array_merge($href, $newUrl); |
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endforeach; |
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return array_unique($href); |
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} /* FeedFinder::_url_manipulation_feeds () */ |
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|
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function _tags ($tag) { |
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$html = $this->data(); |
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|
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// search through the HTML, save all <link> tags |
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// and store each link's attributes in an associative array |
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preg_match_all('/<'.$tag.'\s+(.*?)\s*\/?>/si', $html, $matches); |
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$links = $matches[1]; |
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$ret = array(); |
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$link_count = count($links); |
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for ($n=0; $n<$link_count; $n++) { |
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$attributes = preg_split('/\s+/s', $links[$n]); |
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foreach($attributes as $attribute) { |
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$att = preg_split('/\s*=\s*/s', $attribute, 2); |
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if (isset($att[1])) { |
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$att[1] = preg_replace('/([\'"]?)(.*)\1/', '$2', $att[1]); |
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$final_link[strtolower($att[0])] = $att[1]; |
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} /* if */ |
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} /* foreach */ |
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$ret[$n] = $final_link; |
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} /* for */ |
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return $ret; |
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} /* FeedFinder::_tags () */ |
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} /* class FeedFinder */ |
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|
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|
