gnu-social/socialfy-another-domain/dot-well-known/webfinger/index.php

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<?php
/*
* GNU social
* Copyright (C) 2010, Free Software Foundation, Inc
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
// basename should make sure we can't escape this directory
$u = basename($_GET['resource']);
if (!strpos($u, '@')) {
throw new Exception('Bad resource');
exit(1);
}
if (mb_strpos($u, 'acct:')===0) {
$u = substr($u, 5);
}
// Just to be a little bit safer, you know, with all the unicode stuff going on
$u = filter_var($u, FILTER_SANITIZE_EMAIL);
$f = $u . ".xml";
if (file_exists($f)) {
header('Content-Disposition: attachment; filename="'.urlencode($f).'"');
header('Content-type: application/xrd+xml');
echo file_get_contents($f);
}