gnu-social/plugins/LRDD/lib/lrddmethod/hostmeta.php

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<?php
/**
* 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 StatusNet
* @author James Walker <james@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class LRDDMethod_HostMeta extends LRDDMethod
{
/**
* For RFC6415 and HTTP URIs, fetch the host-meta file
* and look for LRDD templates
*/
public function discover($uri)
{
// This is allowed for RFC6415 but not the 'WebFinger' RFC7033.
$try_schemes = array('https', 'http');
$scheme = mb_strtolower(parse_url($uri, PHP_URL_SCHEME));
switch ($scheme) {
case 'acct':
if (!Discovery::isAcct($uri)) {
throw new Exception('Bad resource URI: '.$uri);
}
// We can't use parse_url data for this, since the 'host'
// entry is only set if the scheme has '://' after it.
list($user, $domain) = explode('@', parse_url($uri, PHP_URL_PATH));
break;
case 'http':
case 'https':
$domain = mb_strtolower(parse_url($uri, PHP_URL_HOST));
$try_schemes = array($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->getBody());
} catch (Exception $e) {
common_debug('LRDD could not load resource descriptor: '.$url.' ('.$e->getMessage().')');
continue;
}
return $this->xrd->links;
}
throw new Exception('Unable to retrieve resource descriptor links.');
}
}