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LittleBeast / src / Std / Lib / Fedi / Actor.php
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1<?php
2/*************************************************************
3# 076 License
4
5Copyright (c) テクニカル諏訪子
6
7Permission is hereby granted to any person obtaining a copy of the software
8Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
9sublicense, and/or sell copies of the Software, subject to the following conditions:
10
11 1. **Origin Attribution**:
12 - You must not misrepresent the origin of the Software; you must not claim
13 you created the original Software.
14 - If the Software is used in a product, you must either:
15 a. Provide clear attribution in the product's documentation, user interface,
16 or other visible areas, **OR**
17 b. Pay the original developers a fee they specify in writing.
18 2. **Usage Restriction**:
19 - The Software, or any derivative works, dependencies, or libraries
20 incorporating it, must not be used for censorship or to suppress freedom of
21 speech, expression, or creativity. Prohibited uses include, but are not
22 limited to:
23 - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
24 ideas, or objective reality.
25 - Tools or systems designed to restrict access to information or
26 artistic works.
27 3. **Notice Preservation**:
28 - This license and the above copyright notice must remain intact in all copies
29 of the source code.
30
31THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
32INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
33PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
34HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
35CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
36OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38namespace Std\Lib\Fedi;
39
40use Std\Lib\Crypto\Rsa;
41
42/**
43 * ローカルのユーザーのアクター（鍵、プロフィール、WebFinger、コレクション）
44 */
45final class Actor {
46 /**
47 * ユーザーの秘密鍵（無ければ作る）
48 *
49 * @return Rsa|null 作れない・読めない場合はnull
50 */
51 public static function privateKey(string $username): ?Rsa {
52 $file = Fedi::userPath($username, 'private.pem');
53 if (!is_file($file)) {
54 $lock = fopen($file.'.lock', 'c');
55 if ($lock) flock($lock, LOCK_EX);
56 try {
57 if (!is_file($file)) {
58 $key = Rsa::generate(2048);
59 file_put_contents($file, $key->toPem());
60 @chmod($file, 0600);
61 file_put_contents(Fedi::userPath($username, 'public.pem'), $key->publicPem());
62 }
63 } finally {
64 if ($lock) {
65 flock($lock, LOCK_UN);
66 fclose($lock);
67 }
68 }
69 }
70 try {
71 $key = Rsa::fromPem((string)file_get_contents($file));
72 } catch (\InvalidArgumentException $e) {
73 logger(\LogType::ActivityPub, "「{$username}」の鍵を読めませんでした：".$e->getMessage());
74 return null;
75 }
76 return $key->isPrivate() ? $key : null;
77 }
78
79 public static function publicKeyPem(string $username): ?string {
80 $file = Fedi::userPath($username, 'public.pem');
81 if (!is_file($file) && self::privateKey($username) === null) return null;
82 return is_file($file) ? (string)file_get_contents($file) : null;
83 }
84
85 public static function keyId(string $username): string {
86 return Fedi::actorUrl($username).'#main-key';
87 }
88
89 /** ユーザーの設定（locked：フォローを承認制にする） */
90 public static function settings(string $username): array {
91 return Fedi::read(Fedi::userPath($username, 'settings.json'), []) + ['locked' => false];
92 }
93
94 public static function saveSettings(string $username, array $settings): void {
95 Fedi::update(Fedi::userPath($username, 'settings.json'), fn($s) => array_merge($s, $settings));
96 }
97
98 /**
99 * アクターのJSON-LD
100 *
101 * @param \stdClass $user ローカルのユーザー（Fedi::localActor()）
102 * @return array
103 */
104 public static function document(\stdClass $user): array {
105 $url = Fedi::actorUrl($user->username);
106 $avatar = avatar_url($user);
107 $doc = [
108 '@context' => Fedi::CONTEXT,
109 'id' => $url,
110 'type' => 'Person',
111 'preferredUsername' => $user->username,
112 'name' => ($user->displayname ?? '') !== '' ? $user->displayname : $user->username,
113 'summary' => ($user->bio ?? '') !== '' ? Html::render($user->bio) : '',
114 'url' => Fedi::base().'/microblog/user/'.$user->username,
115 'inbox' => "{$url}/inbox",
116 'outbox' => "{$url}/outbox",
117 'followers' => "{$url}/followers",
118 'following' => "{$url}/following",
119 'endpoints' => ['sharedInbox' => Fedi::sharedInbox()],
120 'manuallyApprovesFollowers' => (bool)self::settings($user->username)['locked'],
121 'discoverable' => true,
122 'published' => Fedi::now((int)($user->regDate ?? time())),
123 'icon' => [
124 'type' => 'Image',
125 'mediaType' => self::mediaTypeOf($avatar),
126 'url' => preg_match('#^https?://#i', $avatar) ? $avatar : Fedi::base().$avatar,
127 ],
128 ];
129 $pem = self::publicKeyPem($user->username);
130 if ($pem !== null) $doc['publicKey'] = ['id' => self::keyId($user->username), 'owner' => $url, 'publicKeyPem' => $pem];
131 return $doc;
132 }
133
134 /**
135 * WebFingerの応答
136 *
137 * @param string $resource acct:ユーザー@ホスト又はアクターのURL
138 * @return array|null 見つからなければnull
139 */
140 public static function webfinger(string $resource): ?array {
141 $username = null;
142 if (preg_match('/^(?:acct:)?@?([A-Za-z0-9]+)@(.+)$/', $resource, $m) && strtolower($m[2]) === strtolower(Fedi::host())) {
143 $username = $m[1];
144 } else {
145 $username = Fedi::localUsername($resource);
146 }
147 if ($username === null || Fedi::localActor($username) === null) return null;
148
149 return [
150 'subject' => "acct:{$username}@".Fedi::host(),
151 'aliases' => [Fedi::actorUrl($username), Fedi::base().'/microblog/user/'.$username],
152 'links' => [
153 ['rel' => 'self', 'type' => 'application/activity+json', 'href' => Fedi::actorUrl($username)],
154 ['rel' => 'http://webfinger.net/rel/profile-page', 'type' => 'text/html', 'href' => Fedi::base().'/microblog/user/'.$username],
155 ],
156 ];
157 }
158
159 //////// フォロワーとフォロー
160
161 /** フォロワー（アクターのURL => [inbox, sharedInbox, since]） */
162 public static function followers(string $username): array {
163 return Fedi::read(Fedi::userPath($username, 'followers.json'));
164 }
165
166 /** フォロー（アクターのURL => [state（pending/accepted）, id, since]） */
167 public static function following(string $username): array {
168 return Fedi::read(Fedi::userPath($username, 'following.json'));
169 }
170
171 /** 承認待ちのフォローリクエスト（アクターのURL => [activity, at]） */
172 public static function requests(string $username): array {
173 return Fedi::read(Fedi::userPath($username, 'requests.json'));
174 }
175
176 public static function isFollowing(string $username, string $actor): bool {
177 return (self::following($username)[$actor]['state'] ?? '') === 'accepted';
178 }
179
180 public static function isFollowedBy(string $username, string $actor): bool {
181 return isset(self::followers($username)[$actor]);
182 }
183
184 /**
185 * フォロワー・フォローのOrderedCollection（一覧は公開しない。数だけ）
186 */
187 public static function collection(string $username, string $which): array {
188 $list = $which === 'followers' ? self::followers($username)
189 : array_filter(self::following($username), fn($f) => ($f['state'] ?? '') === 'accepted');
190 return [
191 '@context' => 'https://www.w3.org/ns/activitystreams',
192 'id' => Fedi::actorUrl($username)."/{$which}",
193 'type' => 'OrderedCollection',
194 'totalItems' => count($list),
195 ];
196 }
197
198 //////// ブロック
199
200 /** ブロック（actors：アクターのURL、domains：ドメイン） */
201 public static function blocks(string $username): array {
202 return Fedi::read(Fedi::userPath($username, 'blocks.json')) + ['actors' => [], 'domains' => []];
203 }
204
205 /**
206 * このユーザー（又はサイト全体）がブロックしているか
207 */
208 public static function isBlocked(string $username, string $actor): bool {
209 if (self::isDomainBlocked($actor)) return true;
210 $b = self::blocks($username);
211 return in_array($actor, $b['actors'], true) || in_array(Fedi::domainOf($actor), $b['domains'], true);
212 }
213
214 /** サイト全体でブロックしているドメイン（管理者） */
215 public static function blockedDomains(): array {
216 return Fedi::read(Fedi::path('blocked_domains.json'));
217 }
218
219 public static function isDomainBlocked(string $url): bool {
220 $d = Fedi::domainOf($url);
221 if ($d === '') return false;
222 foreach (self::blockedDomains() as $b) {
223 if ($d === $b || str_ends_with($d, '.'.$b)) return true;
224 }
225 return false;
226 }
227
228 //////// 通知
229
230 /**
231 * 通知を追加する（新しい順、200件まで）
232 *
233 * @param string $username ユーザー
234 * @param string $type follow, follow_request, mention, reply, like, boost
235 * @param string $actor 誰から
236 * @param string|null $object 対象の投稿
237 */
238 public static function notify(string $username, string $type, string $actor, ?string $object = null): void {
239 Fedi::update(Fedi::userPath($username, 'notifications.json'), function(array $list) use ($type, $actor, $object): array {
240 // 同じ通知を重複させない
241 foreach ($list as $n) {
242 if ($n['type'] === $type && $n['actor'] === $actor && ($n['object'] ?? null) === $object && $n['at'] > time() - 3600) return $list;
243 }
244 array_unshift($list, ['type' => $type, 'actor' => $actor, 'object' => $object, 'at' => time(), 'read' => false]);
245 return array_slice($list, 0, 200);
246 });
247 }
248
249 public static function notifications(string $username): array {
250 return Fedi::read(Fedi::userPath($username, 'notifications.json'));
251 }
252
253 public static function unreadCount(string $username): int {
254 return count(array_filter(self::notifications($username), fn($n) => !$n['read']));
255 }
256
257 public static function markRead(string $username): void {
258 Fedi::update(Fedi::userPath($username, 'notifications.json'), fn($l) => array_map(fn($n) => ['read' => true] + $n, $l));
259 }
260
261 //////
262
263 private static function mediaTypeOf(string $path): string {
264 return match (strtolower(pathinfo($path, PATHINFO_EXTENSION))) {
265 'png' => 'image/png',
266 'gif' => 'image/gif',
267 'webp' => 'image/webp',
268 default => 'image/jpeg',
269 };
270 }
271}