gnu-social/components/FreeNetwork/Util/LrddMethod/LrddMethodHostMeta.php
2021-10-27 04:22:18 +01:00

87 lines
3.0 KiB
PHP

<?php
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 App\Core\Log;
use Component\FreeNetwork\Util\Discovery;
use Component\FreeNetwork\Util\LrddMethod;
use Exception;
/**
* Implementation of discovery using host-meta file
*
* Discovers resource descriptor file for a user by going to the
* organization's host-meta file and trying to find a template for LRDD.
*
* @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 LrddMethodHostMeta extends LRDDMethod
{
/**
* For RFC6415 and HTTP URIs, fetch the host-meta file
* and look for LRDD templates
*
* @param mixed $uri
*/
public function discover($uri)
{
// This is allowed for RFC6415 but not the 'WebFinger' RFC7033.
$try_schemes = ['https', 'http'];
$scheme = mb_strtolower(parse_url($uri, PHP_URL_SCHEME));
switch ($scheme) {
case 'acct':
// We can't use parse_url data for this, since the 'host'
// entry is only set if the scheme has '://' after it.
$parts = explode('@', parse_url($uri, PHP_URL_PATH), 2);
if (!Discovery::isAcct($uri) || count($parts) != 2) {
throw new Exception('Bad resource URI: ' . $uri);
}
[, $domain] = $parts;
break;
case 'http':
case 'https':
$domain = mb_strtolower(parse_url($uri, PHP_URL_HOST));
$try_schemes = [$scheme];
break;
default:
throw new Exception('Unable to discover resource descriptor endpoint.');
}
foreach ($try_schemes as $scheme) {
$url = $scheme . '://' . $domain . '/.well-known/host-meta';
try {
$response = self::fetchUrl($url);
$this->xrd->loadString($response->getContent());
} catch (Exception $e) {
Log::debug('LRDD could not load resource descriptor: ' . $url . ' (' . $e->getMessage() . ')');
continue;
}
return $this->xrd->links;
}
throw new Exception('Unable to retrieve resource descriptor links.');
}
}