[44] | 1 | <?php
|
---|
| 2 | ################################################################################
|
---|
| 3 | ## class FeedFinder: find likely feeds using autodetection and/or guesswork ####
|
---|
| 4 | ################################################################################
|
---|
| 5 |
|
---|
| 6 | class FeedFinder {
|
---|
| 7 | var $uri = NULL;
|
---|
| 8 | var $_cache_uri = NULL;
|
---|
| 9 |
|
---|
| 10 | var $verify = FALSE;
|
---|
| 11 |
|
---|
| 12 | var $_response = NULL;
|
---|
| 13 | var $_data = NULL;
|
---|
| 14 | var $_error = NULL;
|
---|
| 15 | var $_head = NULL;
|
---|
| 16 |
|
---|
| 17 | # -- Recognition patterns
|
---|
| 18 | var $_feed_types = array(
|
---|
| 19 | 'application/rss+xml',
|
---|
| 20 | 'text/xml',
|
---|
| 21 | 'application/atom+xml',
|
---|
| 22 | 'application/x.atom+xml',
|
---|
| 23 | 'application/x-atom+xml'
|
---|
| 24 | );
|
---|
| 25 | var $_feed_markers = array('\\<feed', '\\<rss', 'xmlns="http://purl.org/rss/1.0');
|
---|
| 26 | var $_html_markers = array('\\<html');
|
---|
| 27 | var $_obvious_feed_url = array('[./]rss', '[./]rdf', '[./]atom', '[./]feed', '\.xml');
|
---|
| 28 | var $_maybe_feed_url = array ('rss', 'rdf', 'atom', 'feed', 'xml');
|
---|
| 29 |
|
---|
| 30 | function FeedFinder ($uri = NULL, $verify = TRUE) {
|
---|
| 31 | $this->uri = $uri; $this->verify = $verify;
|
---|
| 32 | } /* FeedFinder::FeedFinder () */
|
---|
| 33 |
|
---|
| 34 | function find ($uri = NULL) {
|
---|
| 35 | $ret = array ();
|
---|
| 36 | if (!is_null($this->data($uri))) {
|
---|
| 37 | if ($this->is_feed($uri)) {
|
---|
| 38 | $ret = array($this->uri);
|
---|
| 39 | } else {
|
---|
| 40 | // Assume that we have HTML or XHTML (even if we don't, who's it gonna hurt?)
|
---|
| 41 | // Autodiscovery is the preferred method
|
---|
| 42 | $href = $this->_link_rel_feeds();
|
---|
| 43 |
|
---|
| 44 | // ... but we'll also take the little orange buttons
|
---|
| 45 | $href = array_merge($href, $this->_a_href_feeds(TRUE));
|
---|
| 46 |
|
---|
| 47 | // If all that failed, look harder
|
---|
| 48 | if (count($href) == 0) $href = $this->_a_href_feeds(FALSE);
|
---|
| 49 |
|
---|
| 50 | // Our search may turn up duplicate URIs. We only need to do any given URI once.
|
---|
| 51 | // Props to Camilo <http://projects.radgeek.com/2008/12/14/feedwordpress-20081214/#comment-20090122160414>
|
---|
| 52 | $href = array_unique($href);
|
---|
| 53 |
|
---|
| 54 | // Verify feeds and resolve relative URIs
|
---|
| 55 | foreach ($href as $u) {
|
---|
| 56 | $the_uri = Relative_URI::resolve($u, $this->uri);
|
---|
| 57 | if ($this->verify) {
|
---|
| 58 | $feed =& new FeedFinder($the_uri);
|
---|
| 59 | if ($feed->is_feed()) $ret[] = $the_uri;
|
---|
| 60 | $feed = NULL;
|
---|
| 61 | } else {
|
---|
| 62 | $ret[] = $the_uri;
|
---|
| 63 | }
|
---|
| 64 | } /* foreach */
|
---|
| 65 | } /* if */
|
---|
| 66 | } /* if */
|
---|
| 67 | return array_unique($ret);
|
---|
| 68 | } /* FeedFinder::find () */
|
---|
| 69 |
|
---|
| 70 | function data ($uri = NULL) {
|
---|
| 71 | $this->_get($uri);
|
---|
| 72 | return $this->_data;
|
---|
| 73 | }
|
---|
| 74 |
|
---|
| 75 | function status ($uri = NULL) {
|
---|
| 76 | $this->_get($uri);
|
---|
| 77 |
|
---|
| 78 | if (isset($this->_response->status)) :
|
---|
| 79 | $ret = $this->_response->status;
|
---|
| 80 | else :
|
---|
| 81 | $ret = NULL;
|
---|
| 82 | endif;
|
---|
| 83 | return $ret;
|
---|
| 84 | }
|
---|
| 85 |
|
---|
| 86 | function error () {
|
---|
| 87 | return $this->_error;
|
---|
| 88 | }
|
---|
| 89 |
|
---|
| 90 | function is_feed ($uri = NULL) {
|
---|
| 91 | $data = $this->data($uri);
|
---|
| 92 |
|
---|
| 93 | return (
|
---|
| 94 | preg_match (
|
---|
| 95 | "\007(".implode('|',$this->_feed_markers).")\007i",
|
---|
| 96 | $data
|
---|
| 97 | ) and !preg_match (
|
---|
| 98 | "\007(".implode('|',$this->_html_markers).")\007i",
|
---|
| 99 | $data
|
---|
| 100 | )
|
---|
| 101 | );
|
---|
| 102 | } /* FeedFinder::is_feed () */
|
---|
| 103 |
|
---|
| 104 | # --- Private methods ---
|
---|
| 105 | function _get ($uri = NULL) {
|
---|
| 106 | if ($uri) $this->uri = $uri;
|
---|
| 107 |
|
---|
| 108 | // Is the result not yet cached?
|
---|
| 109 | if ($this->_cache_uri !== $this->uri) :
|
---|
| 110 | $headers['Connection'] = 'close';
|
---|
| 111 | $headers['Accept'] = 'application/atom+xml application/rdf+xml application/rss+xml application/xml text/html */*';
|
---|
| 112 | $headers['User-Agent'] = 'feedfinder/1.2 (compatible; PHP FeedFinder) +http://projects.radgeek.com/feedwordpress';
|
---|
| 113 |
|
---|
| 114 | // Use function provided by MagpieRSS package
|
---|
| 115 | $client = _fetch_remote_file($this->uri, $headers);
|
---|
| 116 | if (isset($client->error)) :
|
---|
| 117 | $this->_error = $client->error;
|
---|
| 118 | else :
|
---|
| 119 | $this->_error = NULL;
|
---|
| 120 | endif;
|
---|
| 121 | $this->_response = $client;
|
---|
| 122 | $this->_data = $client->results;
|
---|
| 123 |
|
---|
| 124 | // Kilroy was here
|
---|
| 125 | $this->_cache_uri = $this->uri;
|
---|
| 126 | endif;
|
---|
| 127 | } /* FeedFinder::_get () */
|
---|
| 128 |
|
---|
| 129 | function _link_rel_feeds () {
|
---|
| 130 | $links = $this->_tags('link');
|
---|
| 131 | $link_count = count($links);
|
---|
| 132 |
|
---|
| 133 | // now figure out which one points to the RSS file
|
---|
| 134 | $href = array ();
|
---|
| 135 | for ($n=0; $n<$link_count; $n++) {
|
---|
| 136 | if (strtolower($links[$n]['rel']) == 'alternate') {
|
---|
| 137 | if (in_array(strtolower($links[$n]['type']), $this->_feed_types)) {
|
---|
| 138 | $href[] = $links[$n]['href'];
|
---|
| 139 | } /* if */
|
---|
| 140 | } /* if */
|
---|
| 141 | } /* for */
|
---|
| 142 | return $href;
|
---|
| 143 | }
|
---|
| 144 |
|
---|
| 145 | function _a_href_feeds ($obvious = TRUE) {
|
---|
| 146 | $pattern = ($obvious ? $this->_obvious_feed_url : $this->_maybe_feed_url);
|
---|
| 147 |
|
---|
| 148 | $links = $this->_tags('a');
|
---|
| 149 | $link_count = count($links);
|
---|
| 150 |
|
---|
| 151 | // now figure out which one points to the RSS file
|
---|
| 152 | $href = array ();
|
---|
| 153 | for ($n=0; $n<$link_count; $n++) {
|
---|
| 154 | if (preg_match("\007(".implode('|',$pattern).")\007i", $links[$n]['href'])) {
|
---|
| 155 | $href[] = $links[$n]['href'];
|
---|
| 156 | } /* if */
|
---|
| 157 | } /* for */
|
---|
| 158 | return $href;
|
---|
| 159 | }
|
---|
| 160 |
|
---|
| 161 | function _tags ($tag) {
|
---|
| 162 | $html = $this->data();
|
---|
| 163 |
|
---|
| 164 | // search through the HTML, save all <link> tags
|
---|
| 165 | // and store each link's attributes in an associative array
|
---|
| 166 | preg_match_all('/<'.$tag.'\s+(.*?)\s*\/?>/si', $html, $matches);
|
---|
| 167 | $links = $matches[1];
|
---|
| 168 | $ret = array();
|
---|
| 169 | $link_count = count($links);
|
---|
| 170 | for ($n=0; $n<$link_count; $n++) {
|
---|
| 171 | $attributes = preg_split('/\s+/s', $links[$n]);
|
---|
| 172 | foreach($attributes as $attribute) {
|
---|
| 173 | $att = preg_split('/\s*=\s*/s', $attribute, 2);
|
---|
| 174 | if (isset($att[1])) {
|
---|
| 175 | $att[1] = preg_replace('/([\'"]?)(.*)\1/', '$2', $att[1]);
|
---|
| 176 | $final_link[strtolower($att[0])] = $att[1];
|
---|
| 177 | } /* if */
|
---|
| 178 | } /* foreach */
|
---|
| 179 | $ret[$n] = $final_link;
|
---|
| 180 | } /* for */
|
---|
| 181 | return $ret;
|
---|
| 182 | }
|
---|
| 183 | } /* class FeedFinder */
|
---|
| 184 |
|
---|