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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* A sample module to show best practices for StatusNet plugins
*
* PHP version 5
*
* 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/>.
*
* @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/
*/
define('WEBFINGER_SERVICE_REL_VALUE', 'lrdd');
/**
* Implement the webfinger protocol.
*/
class Webfinger
{
/**
* Perform a webfinger lookup given an account.
*/
public function lookup($id)
{
$id = $this->normalize($id);
list($name, $domain) = explode('@', $id);
$links = $this->getServiceLinks($domain);
if (!$links) {
return false;
}
$services = array();
foreach ($links as $link) {
if ($link['template']) {
return $this->getServiceDescription($link['template'], $id);
}
if ($link['href']) {
return $this->getServiceDescription($link['href'], $id);
}
}
}
/**
* Normalize an account ID
*/
function normalize($id)
{
if (substr($id, 0, 7) == 'acct://') {
return substr($id, 7);
} else if (substr($id, 0, 5) == 'acct:') {
return substr($id, 5);
}
return $id;
}
function getServiceLinks($domain)
{
$url = 'http://'. $domain .'/.well-known/host-meta';
$content = $this->fetchURL($url);
if (empty($content)) {
common_log(LOG_DEBUG, 'Error fetching host-meta');
return false;
}
$result = XRD::parse($content);
// Ensure that the host == domain (spec may include signing later)
if ($result->host != $domain) {
return false;
}
$links = array();
foreach ($result->links as $link) {
if ($link['rel'] == WEBFINGER_SERVICE_REL_VALUE) {
$links[] = $link;
}
}
return $links;
}
function getServiceDescription($template, $id)
{
$url = $this->applyTemplate($template, 'acct:' . $id);
$content = $this->fetchURL($url);
return XRD::parse($content);
}
function fetchURL($url)
{
try {
$client = new HTTPClient();
$response = $client->get($url);
} catch (HTTP_Request2_Exception $e) {
return false;
}
if ($response->getStatus() != 200) {
return false;
}
return $response->getBody();
}
function applyTemplate($template, $id)
{
$template = str_replace('{uri}', urlencode($id), $template);
return $template;
}
function getHostMeta($domain, $template) {
$xrd = new XRD();
$xrd->host = $domain;
$xrd->links[] = array('rel' => 'lrdd',
'template' => $template,
'title' => array('Resource Descriptor'));
return $xrd->toXML();
}
}
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