144 lines
3.8 KiB
PHP
144 lines
3.8 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* A sample module to show best practices for StatusNet plugins
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @package StatusNet
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* @author James Walker <james@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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define('WEBFINGER_SERVICE_REL_VALUE', 'lrdd');
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/**
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* Implement the webfinger protocol.
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*/
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class Webfinger
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{
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/**
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* Perform a webfinger lookup given an account.
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*/
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public function lookup($id)
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{
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$id = $this->normalize($id);
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list($name, $domain) = explode('@', $id);
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$links = $this->getServiceLinks($domain);
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if (!$links) {
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return false;
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}
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$services = array();
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foreach ($links as $link) {
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if ($link['template']) {
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return $this->getServiceDescription($link['template'], $id);
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}
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if ($link['href']) {
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return $this->getServiceDescription($link['href'], $id);
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}
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}
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}
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/**
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* Normalize an account ID
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*/
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function normalize($id)
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{
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if (substr($id, 0, 7) == 'acct://') {
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return substr($id, 7);
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} else if (substr($id, 0, 5) == 'acct:') {
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return substr($id, 5);
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}
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return $id;
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}
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function getServiceLinks($domain)
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{
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$url = 'http://'. $domain .'/.well-known/host-meta';
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$content = $this->fetchURL($url);
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if (empty($content)) {
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common_log(LOG_DEBUG, 'Error fetching host-meta');
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return false;
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}
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$result = XRD::parse($content);
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// Ensure that the host == domain (spec may include signing later)
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if ($result->host != $domain) {
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return false;
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}
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$links = array();
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foreach ($result->links as $link) {
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if ($link['rel'] == WEBFINGER_SERVICE_REL_VALUE) {
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$links[] = $link;
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}
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}
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return $links;
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}
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function getServiceDescription($template, $id)
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{
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$url = $this->applyTemplate($template, 'acct:' . $id);
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$content = $this->fetchURL($url);
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return XRD::parse($content);
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}
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function fetchURL($url)
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{
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try {
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$client = new HTTPClient();
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$response = $client->get($url);
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} catch (HTTP_Request2_Exception $e) {
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return false;
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}
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if ($response->getStatus() != 200) {
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return false;
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}
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return $response->getBody();
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}
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function applyTemplate($template, $id)
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{
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$template = str_replace('{uri}', urlencode($id), $template);
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return $template;
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}
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function getHostMeta($domain, $template) {
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$xrd = new XRD();
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$xrd->host = $domain;
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$xrd->links[] = array('rel' => 'lrdd',
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'template' => $template,
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'title' => array('Resource Descriptor'));
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return $xrd->toXML();
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}
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}
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