forked from GNUsocial/gnu-social
80 lines
2.4 KiB
PHP
80 lines
2.4 KiB
PHP
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<?php
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/**
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* Implementation of discovery using HTML <link> element
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*
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* Discovers XRD file for a user by fetching the URL and reading any
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* <link> elements in the HTML response.
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*
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* @category Discovery
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* @package StatusNet
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class LRDDMethod_LinkHTML extends LRDDMethod
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{
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/**
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* For HTTP IDs, fetch the URL and look for <link> elements
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* in the HTML response.
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*
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* @todo fail out of WebFinger URIs faster
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*/
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public function discover($uri)
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{
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$response = self::fetchUrl($uri);
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return self::parse($response->getBody());
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}
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/**
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* Parse HTML and return <link> elements
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*
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* Given an HTML string, scans the string for <link> elements
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*
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* @param string $html HTML to scan
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*
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* @return array array of associative arrays in JRD-ish array format
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*/
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public function parse($html)
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{
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$links = array();
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preg_match('/<head(\s[^>]*)?>(.*?)<\/head>/is', $html, $head_matches);
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$head_html = $head_matches[2];
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preg_match_all('/<link\s[^>]*>/i', $head_html, $link_matches);
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foreach ($link_matches[0] as $link_html) {
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$link_url = null;
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$link_rel = null;
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$link_type = null;
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preg_match('/\srel=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $rel_matches);
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if ( isset($rel_matches[3]) ) {
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$link_rel = $rel_matches[3];
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} else if ( isset($rel_matches[1]) ) {
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$link_rel = $rel_matches[1];
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}
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preg_match('/\shref=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $href_matches);
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if ( isset($href_matches[3]) ) {
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$link_uri = $href_matches[3];
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} else if ( isset($href_matches[1]) ) {
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$link_uri = $href_matches[1];
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}
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preg_match('/\stype=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $type_matches);
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if ( isset($type_matches[3]) ) {
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$link_type = $type_matches[3];
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} else if ( isset($type_matches[1]) ) {
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$link_type = $type_matches[1];
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}
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$links[] = new XML_XRD_Element_Link($link_rel, $link_uri, $link_type);
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}
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return $links;
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}
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}
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