1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
<?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);
$result = XRD::parse($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();
}
}
|
