forked from GNUsocial/gnu-social
106 lines
3.3 KiB
PHP
106 lines
3.3 KiB
PHP
<?php
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declare(strict_types = 1);
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namespace Component\FreeNetwork\Util\LrddMethod;
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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use Component\FreeNetwork\Util\LrddMethod;
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use XML_XRD_Element_Link;
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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 GNUsocial
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*
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class LrddMethodLinkHtml 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->getContent());
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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 = [];
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preg_match('/<head(\s[^>]*)?>(.*?)<\/head>/is', $html, $head_matches);
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if (\count($head_matches) != 3) {
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return [];
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}
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[, , $head_html] = $head_matches;
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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, $rel_matches);
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if (\count($rel_matches) > 3) {
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$link_rel = $rel_matches[3];
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} elseif (\count($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, $href_matches);
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if (\count($href_matches) > 3) {
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$link_uri = $href_matches[3];
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} elseif (\count($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, $type_matches);
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if (\count($type_matches) > 3) {
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$link_type = $type_matches[3];
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} elseif (\count($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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