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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* 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/>.
*/
/**
* Integrated PuSH hub; lets us only ping them what need it.
* @package Hub
* @maintainer Brion Vibber <brion@status.net>
*/
/**
Things to consider...
* should we purge incomplete subscriptions that never get a verification pingback?
* when can we send subscription renewal checks?
- at next send time probably ok
* when can we handle trimming of subscriptions?
- at next send time probably ok
* should we keep a fail count?
*/
class PushHubAction extends Action
{
function arg($arg, $def=null)
{
// PHP converts '.'s in incoming var names to '_'s.
// It also merges multiple values, which'll break hub.verify and hub.topic for publishing
// @fixme handle multiple args
$arg = str_replace('hub.', 'hub_', $arg);
return parent::arg($arg, $def);
}
function prepare($args)
{
StatusNet::setApi(true); // reduce exception reports to aid in debugging
return parent::prepare($args);
}
function handle()
{
$mode = $this->trimmed('hub.mode');
switch ($mode) {
case "subscribe":
case "unsubscribe":
$this->subunsub($mode);
break;
case "publish":
throw new ClientException("Publishing outside feeds not supported.", 400);
default:
throw new ClientException("Unrecognized mode '$mode'.", 400);
}
}
/**
* Process a request for a new or modified PuSH feed subscription.
* If asynchronous verification is requested, updates won't be saved immediately.
*
* HTTP return codes:
* 202 Accepted - request saved and awaiting verification
* 204 No Content - already subscribed
* 400 Bad Request - rejecting this (not specifically spec'd)
*/
function subunsub($mode)
{
$callback = $this->argUrl('hub.callback');
$topic = $this->argUrl('hub.topic');
if (!$this->recognizedFeed($topic)) {
throw new ClientException("Unsupported hub.topic $topic; this hub only serves local user and group Atom feeds.");
}
$verify = $this->arg('hub.verify'); // @fixme may be multiple
if ($verify != 'sync' && $verify != 'async') {
throw new ClientException("Invalid hub.verify $verify; must be sync or async.");
}
$lease = $this->arg('hub.lease_seconds', null);
if ($mode == 'subscribe' && $lease != '' && !preg_match('/^\d+$/', $lease)) {
throw new ClientException("Invalid hub.lease $lease; must be empty or positive integer.");
}
$token = $this->arg('hub.verify_token', null);
$secret = $this->arg('hub.secret', null);
if ($secret != '' && strlen($secret) >= 200) {
throw new ClientException("Invalid hub.secret $secret; must be under 200 bytes.");
}
$sub = HubSub::staticGet($topic, $callback);
if (!$sub) {
// Creating a new one!
$sub = new HubSub();
$sub->topic = $topic;
$sub->callback = $callback;
}
if ($mode == 'subscribe') {
if ($secret) {
$sub->secret = $secret;
}
if ($lease) {
$sub->setLease(intval($lease));
}
}
if (!common_config('queue', 'enabled')) {
// Won't be able to background it.
$verify = 'sync';
}
if ($verify == 'async') {
$sub->scheduleVerify($mode, $token);
header('HTTP/1.1 202 Accepted');
} else {
$sub->verify($mode, $token);
header('HTTP/1.1 204 No Content');
}
}
/**
* Check whether the given URL represents one of our canonical
* user or group Atom feeds.
*
* @param string $feed URL
* @return boolean true if it matches
*/
function recognizedFeed($feed)
{
$matches = array();
if (preg_match('!/(\d+)\.atom$!', $feed, $matches)) {
$id = $matches[1];
$params = array('id' => $id, 'format' => 'atom');
$userFeed = common_local_url('ApiTimelineUser', $params);
$groupFeed = common_local_url('ApiTimelineGroup', $params);
if ($feed == $userFeed) {
$user = User::staticGet('id', $id);
if (!$user) {
throw new ClientException("Invalid hub.topic $feed; user doesn't exist.");
} else {
return true;
}
}
if ($feed == $groupFeed) {
$user = User_group::staticGet('id', $id);
if (!$user) {
throw new ClientException("Invalid hub.topic $feed; group doesn't exist.");
} else {
return true;
}
}
common_log(LOG_DEBUG, "Not a user or group feed? $feed $userFeed $groupFeed");
}
common_log(LOG_DEBUG, "LOST $feed");
return false;
}
/**
* Grab and validate a URL from POST parameters.
* @throws ClientException for malformed or non-http/https URLs
*/
protected function argUrl($arg)
{
$url = $this->arg($arg);
$params = array('domain_check' => false, // otherwise breaks my local tests :P
'allowed_schemes' => array('http', 'https'));
if (Validate::uri($url, $params)) {
return $url;
} else {
throw new ClientException("Invalid URL passed for $arg: '$url'");
}
}
/**
* Get HubSub subscription record for a given feed & subscriber.
*
* @param string $feed
* @param string $callback
* @return mixed HubSub or false
*/
protected function getSub($feed, $callback)
{
return HubSub::staticGet($feed, $callback);
}
}
|
