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
203
204
205
206
|
<?php
class MastodonBridge extends BridgeAbstract
{
// This script attempts to imitiate the behaviour of a read-only ActivityPub server
// to read the outbox.
// Note: Most PixelFed instances have ActivityPub outbox disabled,
// so use the official feed: https://pixelfed.instance/users/username.atom (Posts only)
const MAINTAINER = 'Austin Huang';
const NAME = 'ActivityPub Bridge';
const CACHE_TIMEOUT = 900; // 15mn
const DESCRIPTION = 'Returns recent statuses. Supports Mastodon, Pleroma and Misskey, among others. Access to
instances that have Authorized Fetch enabled requires
<a href="https://rss-bridge.github.io/rss-bridge/Bridge_Specific/ActivityPub_(Mastodon).html">configuration</a>.';
const URI = 'https://mastodon.social';
// Some Mastodon instances use Secure Mode which requires all requests to be signed.
// You do not need this for most instances, but if you want to support every known
// instance, then you should configure them.
// See also https://docs.joinmastodon.org/spec/security/#http
const CONFIGURATION = [
'private_key' => [
'required' => false,
],
'key_id' => [
'required' => false,
],
];
const PARAMETERS = [[
'canusername' => [
'name' => 'Canonical username',
'exampleValue' => '@sebsauvage@framapiaf.org',
'required' => true,
],
'norep' => [
'name' => 'Without replies',
'type' => 'checkbox',
'title' => 'Only return statuses that are not replies, as determined by relations (not mentions).'
],
'noboost' => [
'name' => 'Without boosts',
'required' => false,
'type' => 'checkbox',
'title' => 'Hide boosts. Note that RSS-Bridge will fetch the original status from other federated instances.'
]
]];
public function getName()
{
if ($this->getInput('canusername')) {
return $this->getInput('canusername');
}
return parent::getName();
}
private function getInstance()
{
preg_match('/^@[a-zA-Z0-9_]+@(.+)/', $this->getInput('canusername'), $matches);
return $matches[1];
}
private function getUsername()
{
preg_match('/^@([a-zA-Z_0-9_]+)@.+/', $this->getInput('canusername'), $matches);
return $matches[1];
}
public function getURI()
{
if ($this->getInput('canusername')) {
// We parse webfinger to make sure the URL is correct. This is mostly because
// MissKey uses user ID instead of the username in the endpoint, domain delegations,
// and also to be compatible with future ActivityPub implementations.
$resource = 'acct:' . $this->getUsername() . '@' . $this->getInstance();
$webfingerUrl = 'https://' . $this->getInstance() . '/.well-known/webfinger?resource=' . $resource;
$webfingerHeader = [
'Content-Type: application/jrd+json'
];
$webfinger = json_decode(getContents($webfingerUrl, $webfingerHeader), true);
foreach ($webfinger['links'] as $link) {
if ($link['type'] === 'application/activity+json') {
return $link['href'];
}
}
}
return parent::getURI();
}
public function collectData()
{
$url = $this->getURI() . '/outbox?page=true';
$content = $this->fetchAP($url);
if ($content['id'] === $url) {
foreach ($content['orderedItems'] as $status) {
$this->items[] = $this->parseItem($status);
}
} else {
throw new \Exception('Unexpected response from server.');
}
}
protected function parseItem($content)
{
$item = [];
switch ($content['type']) {
case 'Announce': // boost
if ($this->getInput('noboost')) {
return null;
}
// We fetch the boosted content.
try {
$rtContent = $this->fetchAP($content['object']);
$rtUser = $this->loadCacheValue($rtContent['attributedTo'], 86400);
if (!isset($rtUser)) {
// We fetch the author, since we cannot always assume the format of the URL.
$user = $this->fetchAP($rtContent['attributedTo']);
preg_match('/https?:\/\/([a-z0-9-\.]{0,})\//', $rtContent['attributedTo'], $matches);
// We assume that the server name as indicated by the path is the actual server name,
// since using webfinger to delegate domains is not officially supported, and it only
// seems to work in one way.
$rtUser = '@' . $user['preferredUsername'] . '@' . $matches[1];
$this->saveCacheValue($rtContent['attributedTo'], $rtUser);
}
$item['author'] = $rtUser;
$item['title'] = 'Shared a status by ' . $rtUser . ': ';
$item = $this->parseObject($rtContent, $item);
} catch (UnexpectedResponseException $th) {
$item['title'] = 'Shared an unreachable status: ' . $content['object'];
$item['content'] = $content['object'];
$item['uri'] = $content['object'];
}
break;
case 'Create': // posts
if ($this->getInput('norep') && isset($content['object']['inReplyTo'])) {
return null;
}
$item['author'] = $this->getInput('canusername');
$item['title'] = '';
$item = $this->parseObject($content['object'], $item);
}
$item['timestamp'] = $content['published'];
$item['uid'] = $content['id'];
return $item;
}
protected function parseObject($object, $item)
{
$item['content'] = $object['content'];
$strippedContent = strip_tags(str_replace('<br>', ' ', $object['content']));
if (mb_strlen($strippedContent) > 75) {
$contentSubstring = mb_substr($strippedContent, 0, mb_strpos(wordwrap($strippedContent, 75), "\n"));
$item['title'] .= $contentSubstring . '...';
} else {
$item['title'] .= $strippedContent;
}
$item['uri'] = $object['id'];
foreach ($object['attachment'] as $attachment) {
// Only process REMOTE pictures (prevent xss)
if (
$attachment['mediaType']
&& preg_match('/^image\//', $attachment['mediaType'], $match)
&& preg_match('/^http(s|):\/\//', $attachment['url'], $match)
) {
$item['content'] = $item['content'] . '<br /><img ';
if ($attachment['name']) {
$item['content'] .= sprintf('alt="%s" ', $attachment['name']);
}
$item['content'] .= sprintf('src="%s" />', $attachment['url']);
}
}
return $item;
}
protected function fetchAP($url)
{
$d = new DateTime();
$d->setTimezone(new DateTimeZone('GMT'));
$date = $d->format('D, d M Y H:i:s e');
preg_match('/https?:\/\/([a-z0-9-\.]{0,})(\/[^?#]+)/', $url, $matches);
$headers = [
'Accept: application/activity+json',
'Host: ' . $matches[1],
'Date: ' . $date
];
$privateKey = $this->getOption('private_key');
$keyId = $this->getOption('key_id');
if ($privateKey && $keyId) {
$pkey = openssl_pkey_get_private('file://' . $privateKey);
$toSign = '(request-target): get ' . $matches[2] . "\nhost: " . $matches[1] . "\ndate: " . $date;
$result = openssl_sign($toSign, $signature, $pkey, 'RSA-SHA256');
if ($result) {
Debug::log($toSign);
$sig = 'Signature: keyId="' . $keyId . '",headers="(request-target) host date",signature="' .
base64_encode($signature) . '"';
Debug::log($sig);
array_push($headers, $sig);
}
}
return json_decode(getContents($url, $headers), true);
}
}
|
