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

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<?php
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declare(strict_types = 1);
// 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/>.
namespace Component\FreeNetwork\Util\LrddMethod;
use Component\FreeNetwork\Util\Discovery;
use Component\FreeNetwork\Util\LrddMethod;
use Exception;
use XML_XRD_Element_Link;
/**
* Implementation of WebFinger resource discovery (RFC7033)
*
* @category Discovery
* @package GNUsocial
*
* @author Mikael Nordfeldth <mmn@hethane.se>
* @copyright 2013 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class LrddMethodWebfinger extends LRDDMethod
{
/**
* Simply returns the WebFinger URL over HTTPS at the uri's domain:
* https://{domain}/.well-known/webfinger?resource={uri}
*/
public function discover($uri)
{
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$parts = explode('@', parse_url($uri, \PHP_URL_PATH), 2);
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if (!Discovery::isAcct($uri) || \count($parts) != 2) {
throw new Exception('Bad resource URI: ' . $uri);
}
[, $domain] = $parts;
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if (!filter_var($domain, \FILTER_VALIDATE_IP)
&& !filter_var(gethostbyname($domain), \FILTER_VALIDATE_IP)) {
throw new Exception('Bad resource host.');
}
$link = new XML_XRD_Element_Link(
Discovery::LRDD_REL,
'https://' . $domain . '/.well-known/webfinger?resource={uri}',
Discovery::JRD_MIMETYPE,
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true, // isTemplate
);
return [$link];
}
}