gnu-social/components/FreeNetwork/Util/LrddMethod/LrddMethodLinkHtml.php

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<?php
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declare(strict_types = 1);
namespace Component\FreeNetwork\Util\LrddMethod;
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
use Component\FreeNetwork\Util\LrddMethod;
use XML_XRD_Element_Link;
/**
* Implementation of discovery using HTML <link> element
*
* Discovers XRD file for a user by fetching the URL and reading any
* <link> elements in the HTML response.
*
* @category Discovery
* @package GNUsocial
*
* @author James Walker <james@status.net>
* @copyright 2010 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class LrddMethodLinkHtml extends LRDDMethod
{
/**
* For HTTP IDs, fetch the URL and look for <link> elements
* in the HTML response.
*
* @todo fail out of WebFinger URIs faster
*/
public function discover($uri)
{
$response = self::fetchUrl($uri);
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return self::parse($response->getContent());
}
/**
* Parse HTML and return <link> elements
*
* Given an HTML string, scans the string for <link> elements
*
* @param string $html HTML to scan
*
* @return array array of associative arrays in JRD-ish array format
*/
public function parse($html)
{
$links = [];
preg_match('/<head(\s[^>]*)?>(.*?)<\/head>/is', $html, $head_matches);
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if (\count($head_matches) != 3) {
return [];
}
[, , $head_html] = $head_matches;
preg_match_all('/<link\s[^>]*>/i', $head_html, $link_matches);
foreach ($link_matches[0] as $link_html) {
$link_url = null;
$link_rel = null;
$link_type = null;
preg_match('/\srel=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $rel_matches);
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if (\count($rel_matches) > 3) {
$link_rel = $rel_matches[3];
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} elseif (\count($rel_matches) > 1) {
$link_rel = $rel_matches[1];
}
preg_match('/\shref=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $href_matches);
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if (\count($href_matches) > 3) {
$link_uri = $href_matches[3];
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} elseif (\count($href_matches) > 1) {
$link_uri = $href_matches[1];
}
preg_match('/\stype=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $type_matches);
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if (\count($type_matches) > 3) {
$link_type = $type_matches[3];
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} elseif (\count($type_matches) > 1) {
$link_type = $type_matches[1];
}
$links[] = new XML_XRD_Element_Link($link_rel, $link_uri, $link_type);
}
return $links;
}
}