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-rw-r--r--plugins/OStatus/lib/webfinger.php143
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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();
+ }
+}
+
+