src/Protocol/ActivityPub.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub.php
   4  */
   5 namespace Friendica\Protocol;
   6
   7 use Friendica\Database\DBA;
   8 use Friendica\Core\System;
   9 use Friendica\BaseObject;
  10 use Friendica\Util\Network;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\Item;
  16 use Friendica\Model\User;
  17 use Friendica\Util\DateTimeFormat;
  18 use Friendica\Util\Crypto;
  19 use Friendica\Content\Text\BBCode;
  20 use Friendica\Content\Text\HTML;
  21 use Friendica\Network\Probe;
  22
  23 /**
  24  * @brief ActivityPub Protocol class
  25  * The ActivityPub Protocol is a message exchange protocol defined by the W3C.
  26  * https://www.w3.org/TR/activitypub/
  27  * https://www.w3.org/TR/activitystreams-core/
  28  * https://www.w3.org/TR/activitystreams-vocabulary/
  29  *
  30  * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
  31  * https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
  32  *
  33  * Digest: https://tools.ietf.org/html/rfc5843
  34  * https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
  35  *
  36  * Part of the code for HTTP signing is taken from the Osada project.
  37  *
  38  *
  39  * To-do:
  40  *
  41  * Receiver:
  42  * - Activities: Dislike, Update, Delete
  43  * - Object Types: Person, Tombstome
  44  *
  45  * Transmitter:
  46  * - Activities: Like, Dislike, Update, Delete
  47  * - Object Tyoes: Article, Announce, Person, Tombstone
  48  *
  49  * General:
  50  * - Message distribution
  51  * - Endpoints: Outbox, Object, Follower, Following
  52  */
  53 class ActivityPub
  54 {
  55         const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
  56
  57         public static function transmit($data, $target, $uid)
  58         {
  59                 $owner = User::getOwnerDataById($uid);
  60
  61                 if (!$owner) {
  62                         return;
  63                 }
  64
  65                 $content = json_encode($data);
  66
  67                 $host = parse_url($target, PHP_URL_HOST);
  68                 $path = parse_url($target, PHP_URL_PATH);
  69                 $date = date('r');
  70
  71                 $headers = ['Host: ' . $host, 'Date: ' . $date];
  72
  73                 $signed_data = "(request-target): post " . $path . "\nhost: " . $host . "\ndate: " . $date;
  74
  75                 $signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
  76
  77                 $headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",headers="(request-target) host date",signature="' . $signature . '"';
  78                 $headers[] = 'Content-Type: application/activity+json';
  79
  80                 Network::post($target, $content, $headers);
  81                 $return_code = BaseObject::getApp()->get_curl_code();
  82
  83                 logger('Transmit to ' . $target . ' returned ' . $return_code);
  84         }
  85
  86         /**
  87          * Return the ActivityPub profile of the given user
  88          *
  89          * @param integer $uid User ID
  90          * @return array
  91          */
  92         public static function profile($uid)
  93         {
  94                 $accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  95
  96                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
  97                         'account_removed' => false, 'verified' => true];
  98                 $fields = ['guid', 'nickname', 'pubkey', 'account-type'];
  99                 $user = DBA::selectFirst('user', $fields, $condition);
 100                 if (!DBA::isResult($user)) {
 101                         return [];
 102                 }
 103
 104                 $fields = ['locality', 'region', 'country-name'];
 105                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 106                 if (!DBA::isResult($profile)) {
 107                         return [];
 108                 }
 109
 110                 $fields = ['name', 'url', 'location', 'about', 'avatar'];
 111                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 112                 if (!DBA::isResult($contact)) {
 113                         return [];
 114                 }
 115
 116                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 117                         ['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
 118                         'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
 119
 120                 $data['id'] = $contact['url'];
 121                 $data['uuid'] = $user['guid'];
 122                 $data['type'] = $accounttype[$user['account-type']];
 123                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 124                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 125                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 126                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 127                 $data['preferredUsername'] = $user['nickname'];
 128                 $data['name'] = $contact['name'];
 129                 $data['vcard:hasAddress'] = ['@type' => 'Home', 'vcard:country-name' => $profile['country-name'],
 130                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 131                 $data['summary'] = $contact['about'];
 132                 $data['url'] = $contact['url'];
 133                 $data['manuallyApprovesFollowers'] = false;
 134                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 135                         'owner' => $contact['url'],
 136                         'publicKeyPem' => $user['pubkey']];
 137                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 138                 $data['icon'] = ['type' => 'Image',
 139                         'url' => $contact['avatar']];
 140
 141                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 142                 return $data;
 143         }
 144
 145         public static function createActivityFromItem($item_id)
 146         {
 147                 $item = Item::selectFirst([], ['id' => $item_id]);
 148
 149                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 150                         ['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
 151                         'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
 152                         'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
 153                         'toot' => 'http://joinmastodon.org/ns#']]];
 154
 155                 $data['type'] = 'Create';
 156                 $data['id'] = $item['uri'];
 157                 $data['actor'] = $item['author-link'];
 158                 $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
 159                 $data['object'] = self::createNote($item);
 160                 return $data;
 161         }
 162
 163         public static function createNote($item)
 164         {
 165                 $data = [];
 166                 $data['type'] = 'Note';
 167                 $data['id'] = $item['uri'];
 168
 169                 if ($item['uri'] != $item['thr-parent']) {
 170                         $data['inReplyTo'] = $item['thr-parent'];
 171                 }
 172
 173                 $conversation = DBA::selectFirst('conversation', ['conversation-uri'], ['item-uri' => $item['parent-uri']]);
 174                 if (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 175                         $conversation_uri = $conversation['conversation-uri'];
 176                 } else {
 177                         $conversation_uri = $item['parent-uri'];
 178                 }
 179
 180                 $data['context'] = $data['conversation'] = $conversation_uri;
 181                 $data['actor'] = $item['author-link'];
 182                 $data['to'] = [];
 183                 if (!$item['private']) {
 184                         $data['to'][] = 'https://www.w3.org/ns/activitystreams#Public';
 185                 }
 186                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 187                 $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 188                 $data['attributedTo'] = $item['author-link'];
 189                 $data['name'] = BBCode::convert($item['title'], false, 7);
 190                 $data['content'] = BBCode::convert($item['body'], false, 7);
 191                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 192                 //$data['summary'] = ''; // Ignore by now
 193                 //$data['sensitive'] = false; // - Query NSFW
 194                 //$data['emoji'] = []; // Ignore by now
 195                 //$data['tag'] = []; /// @ToDo
 196                 //$data['attachment'] = []; // @ToDo
 197                 return $data;
 198         }
 199
 200         public static function transmitActivity($activity, $target, $uid)
 201         {
 202                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 203
 204                 $owner = User::getOwnerDataById($uid);
 205
 206                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 207                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 208                         'type' => $activity,
 209                         'actor' => $owner['url'],
 210                         'object' => $profile['url']];
 211
 212                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 213                 return self::transmit($data,  $profile['notify'], $uid);
 214         }
 215
 216         public static function transmitContactAccept($target, $id, $uid)
 217         {
 218                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 219
 220                 $owner = User::getOwnerDataById($uid);
 221                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 222                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 223                         'type' => 'Accept',
 224                         'actor' => $owner['url'],
 225                         'object' => ['id' => $id, 'type' => 'Follow',
 226                                 'actor' => $profile['url'],
 227                                 'object' => $owner['url']]];
 228
 229                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 230                 return self::transmit($data,  $profile['notify'], $uid);
 231         }
 232
 233         public static function transmitContactReject($target, $id, $uid)
 234         {
 235                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 236
 237                 $owner = User::getOwnerDataById($uid);
 238                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 239                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 240                         'type' => 'Reject',
 241                         'actor' => $owner['url'],
 242                         'object' => ['id' => $id, 'type' => 'Follow',
 243                                 'actor' => $profile['url'],
 244                                 'object' => $owner['url']]];
 245
 246                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 247                 return self::transmit($data,  $profile['notify'], $uid);
 248         }
 249
 250         public static function transmitContactUndo($target, $uid)
 251         {
 252                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 253
 254                 $id = System::baseUrl() . '/activity/' . System::createGUID();
 255
 256                 $owner = User::getOwnerDataById($uid);
 257                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 258                         'id' => $id,
 259                         'type' => 'Undo',
 260                         'actor' => $owner['url'],
 261                         'object' => ['id' => $id, 'type' => 'Follow',
 262                                 'actor' => $owner['url'],
 263                                 'object' => $profile['url']]];
 264
 265                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 266                 return self::transmit($data,  $profile['notify'], $uid);
 267         }
 268
 269         /**
 270          * Fetches ActivityPub content from the given url
 271          *
 272          * @param string $url content url
 273          * @return array
 274          */
 275         public static function fetchContent($url)
 276         {
 277                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json']);
 278
 279                 if (!$ret['success'] || empty($ret['body'])) {
 280                         return;
 281                 }
 282
 283                 return json_decode($ret['body'], true);
 284         }
 285
 286         /**
 287          * Resolves the profile url from the address by using webfinger
 288          *
 289          * @param string $addr profile address (user@domain.tld)
 290          * @return string url
 291          */
 292         private static function addrToUrl($addr)
 293         {
 294                 $addr_parts = explode('@', $addr);
 295                 if (count($addr_parts) != 2) {
 296                         return false;
 297                 }
 298
 299                 $webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
 300
 301                 $ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
 302                 if (!$ret['success'] || empty($ret['body'])) {
 303                         return false;
 304                 }
 305
 306                 $data = json_decode($ret['body'], true);
 307
 308                 if (empty($data['links'])) {
 309                         return false;
 310                 }
 311
 312                 foreach ($data['links'] as $link) {
 313                         if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
 314                                 continue;
 315                         }
 316
 317                         if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
 318                                 return $link['href'];
 319                         }
 320                 }
 321
 322                 return false;
 323         }
 324
 325         public static function verifySignature($content, $http_headers)
 326         {
 327                 $object = json_decode($content, true);
 328
 329                 if (empty($object)) {
 330                         return false;
 331                 }
 332
 333                 $actor = self::processElement($object, 'actor', 'id');
 334
 335                 $headers = [];
 336                 $headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
 337
 338                 // First take every header
 339                 foreach ($http_headers as $k => $v) {
 340                         $field = str_replace('_', '-', strtolower($k));
 341                         $headers[$field] = $v;
 342                 }
 343
 344                 // Now add every http header
 345                 foreach ($http_headers as $k => $v) {
 346                         if (strpos($k, 'HTTP_') === 0) {
 347                                 $field = str_replace('_', '-', strtolower(substr($k, 5)));
 348                                 $headers[$field] = $v;
 349                         }
 350                 }
 351
 352                 $sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
 353
 354                 if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
 355                         return false;
 356                 }
 357
 358                 $signed_data = '';
 359                 foreach ($sig_block['headers'] as $h) {
 360                         if (array_key_exists($h, $headers)) {
 361                                 $signed_data .= $h . ': ' . $headers[$h] . "\n";
 362                         }
 363                 }
 364                 $signed_data = rtrim($signed_data, "\n");
 365
 366                 if (empty($signed_data)) {
 367                         return false;
 368                 }
 369
 370                 $algorithm = null;
 371
 372                 if ($sig_block['algorithm'] === 'rsa-sha256') {
 373                         $algorithm = 'sha256';
 374                 }
 375
 376                 if ($sig_block['algorithm'] === 'rsa-sha512') {
 377                         $algorithm = 'sha512';
 378                 }
 379
 380                 if (empty($algorithm)) {
 381                         return false;
 382                 }
 383
 384                 $key = self::fetchKey($sig_block['keyId'], $actor);
 385
 386                 if (empty($key)) {
 387                         return false;
 388                 }
 389
 390                 if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
 391                         return false;
 392                 }
 393
 394                 // Check the digest if it was part of the signed data
 395                 if (in_array('digest', $sig_block['headers'])) {
 396                         $digest = explode('=', $headers['digest'], 2);
 397                         if ($digest[0] === 'SHA-256') {
 398                                 $hashalg = 'sha256';
 399                         }
 400                         if ($digest[0] === 'SHA-512') {
 401                                 $hashalg = 'sha512';
 402                         }
 403
 404                         /// @todo add all hashes from the rfc
 405
 406                         if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
 407                                 return false;
 408                         }
 409                 }
 410
 411                 // Check the content-length if it was part of the signed data
 412                 if (in_array('content-length', $sig_block['headers'])) {
 413                         if (strlen($content) != $headers['content-length']) {
 414                                 return false;
 415                         }
 416                 }
 417
 418                 return true;
 419
 420         }
 421
 422         private static function fetchKey($id, $actor)
 423         {
 424                 $url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
 425
 426                 $profile = Probe::uri($url, Protocol::ACTIVITYPUB);
 427                 if (!empty($profile)) {
 428                         return $profile['pubkey'];
 429                 } elseif ($url != $actor) {
 430                         $profile = Probe::uri($actor, Protocol::ACTIVITYPUB);
 431                         if (!empty($profile)) {
 432                                 return $profile['pubkey'];
 433                         }
 434                 }
 435
 436                 return false;
 437         }
 438
 439         /**
 440          * @brief
 441          *
 442          * @param string $header
 443          * @return array associate array with
 444          *   - \e string \b keyID
 445          *   - \e string \b algorithm
 446          *   - \e array  \b headers
 447          *   - \e string \b signature
 448          */
 449         private static function parseSigHeader($header)
 450         {
 451                 $ret = [];
 452                 $matches = [];
 453
 454                 if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
 455                         $ret['keyId'] = $matches[1];
 456                 }
 457
 458                 if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
 459                         $ret['algorithm'] = $matches[1];
 460                 }
 461
 462                 if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
 463                         $ret['headers'] = explode(' ', $matches[1]);
 464                 }
 465
 466                 if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
 467                         $ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
 468                 }
 469
 470                 return $ret;
 471         }
 472
 473         /**
 474          * Fetches a profile from the given url
 475          *
 476          * @param string $url profile url
 477          * @return array
 478          */
 479         public static function fetchProfile($url)
 480         {
 481                 if (empty(parse_url($url, PHP_URL_SCHEME))) {
 482                         $url = self::addrToUrl($url);
 483                         if (empty($url)) {
 484                                 return false;
 485                         }
 486                 }
 487
 488                 $data = self::fetchContent($url);
 489
 490                 if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
 491                         return false;
 492                 }
 493
 494                 $profile = ['network' => Protocol::ACTIVITYPUB];
 495                 $profile['nick'] = $data['preferredUsername'];
 496                 $profile['name'] = defaults($data, 'name', $profile['nick']);
 497                 $profile['guid'] = defaults($data, 'uuid', null);
 498                 $profile['url'] = $data['id'];
 499
 500                 $parts = parse_url($profile['url']);
 501                 unset($parts['scheme']);
 502                 unset($parts['path']);
 503                 $profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 504                 $profile['alias'] = self::processElement($data, 'url', 'href');
 505                 $profile['photo'] = self::processElement($data, 'icon', 'url');
 506                 // $profile['community']
 507                 // $profile['keywords']
 508                 // $profile['location']
 509                 $profile['about'] = defaults($data, 'summary', '');
 510                 $profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
 511                 $profile['notify'] = $data['inbox'];
 512                 $profile['poll'] = $data['outbox'];
 513                 $profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
 514
 515                 // Check if the address is resolvable
 516                 if (self::addrToUrl($profile['addr']) == $profile['url']) {
 517                         $parts = parse_url($profile['url']);
 518                         unset($parts['path']);
 519                         $profile['baseurl'] = Network::unparseURL($parts);
 520                 } else {
 521                         unset($profile['addr']);
 522                 }
 523
 524                 if ($profile['url'] == $profile['alias']) {
 525                         unset($profile['alias']);
 526                 }
 527
 528                 // Remove all "null" fields
 529                 foreach ($profile as $field => $content) {
 530                         if (is_null($content)) {
 531                                 unset($profile[$field]);
 532                         }
 533                 }
 534
 535 /*
 536                 // To-Do
 537                 unset($data['type']);
 538                 unset($data['manuallyApprovesFollowers']);
 539
 540                 // Unhandled
 541                 unset($data['@context']);
 542                 unset($data['tag']);
 543                 unset($data['attachment']);
 544                 unset($data['image']);
 545                 unset($data['nomadicLocations']);
 546                 unset($data['signature']);
 547                 unset($data['following']);
 548                 unset($data['followers']);
 549                 unset($data['featured']);
 550                 unset($data['movedTo']);
 551                 unset($data['liked']);
 552                 unset($data['sharedInbox']); // Misskey
 553                 unset($data['isCat']); // Misskey
 554                 unset($data['kroeg:blocks']); // Kroeg
 555                 unset($data['updated']); // Kroeg
 556 */
 557                 return $profile;
 558         }
 559
 560         public static function processInbox($body, $header, $uid)
 561         {
 562                 logger('Incoming message for user ' . $uid, LOGGER_DEBUG);
 563
 564                 if (!self::verifySignature($body, $header)) {
 565                         logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
 566                         return;
 567                 }
 568
 569                 $activity = json_decode($body, true);
 570
 571                 if (!is_array($activity)) {
 572                         logger('Invalid body.', LOGGER_DEBUG);
 573                         return;
 574                 }
 575
 576                 self::processActivity($activity, $body, $uid);
 577         }
 578
 579         public static function fetchOutbox($url)
 580         {
 581                 $data = self::fetchContent($url);
 582                 if (empty($data)) {
 583                         return;
 584                 }
 585
 586                 if (!empty($data['orderedItems'])) {
 587                         $items = $data['orderedItems'];
 588                 } elseif (!empty($data['first']['orderedItems'])) {
 589                         $items = $data['first']['orderedItems'];
 590                 } elseif (!empty($data['first'])) {
 591                         self::fetchOutbox($data['first']);
 592                         return;
 593                 } else {
 594                         $items = [];
 595                 }
 596
 597                 foreach ($items as $activity) {
 598                         self::processActivity($activity);
 599                 }
 600         }
 601
 602         function processActivity($activity, $body = '', $uid = null)
 603         {
 604                 if (empty($activity['type'])) {
 605                         logger('Empty type', LOGGER_DEBUG);
 606                         return;
 607                 }
 608
 609                 if (empty($activity['object'])) {
 610                         logger('Empty object', LOGGER_DEBUG);
 611                         return;
 612                 }
 613
 614                 if (empty($activity['actor'])) {
 615                         logger('Empty actor', LOGGER_DEBUG);
 616                         return;
 617
 618                 }
 619
 620                 $actor = self::processElement($activity, 'actor', 'id');
 621                 if (empty($actor)) {
 622                         logger('Empty actor - 2', LOGGER_DEBUG);
 623                         return;
 624                 }
 625
 626                 if (is_string($activity['object'])) {
 627                         $object_url = $activity['object'];
 628                 } elseif (!empty($activity['object']['id'])) {
 629                         $object_url = $activity['object']['id'];
 630                 } else {
 631                         logger('No object found', LOGGER_DEBUG);
 632                         return;
 633                 }
 634
 635                 // ----------------------------------
 636 /*
 637                 // unhandled
 638                 unset($activity['@context']);
 639                 unset($activity['id']);
 640
 641                 // Non standard
 642                 unset($activity['title']);
 643                 unset($activity['atomUri']);
 644                 unset($activity['context_id']);
 645                 unset($activity['statusnetConversationId']);
 646
 647                 // To-Do?
 648                 unset($activity['context']);
 649                 unset($activity['location']);
 650                 unset($activity['signature']);
 651 */
 652                 // Fetch all receivers from to, cc, bto and bcc
 653                 $receivers = self::getReceivers($activity);
 654
 655                 // When it is a delivery to a personal inbox we add that user to the receivers
 656                 if (!empty($uid)) {
 657                         $owner = User::getOwnerDataById($uid);
 658                         $additional = [$owner['url'] => $uid];
 659                         $receivers = array_merge($receivers, $additional);
 660                 }
 661
 662                 logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
 663
 664                 logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
 665
 666                 // Fetch the content only on activities where this matters
 667                 if (in_array($activity['type'], ['Create', 'Update', 'Announce'])) {
 668                         $item = self::fetchObject($object_url, $activity['object']);
 669                         if (empty($item)) {
 670                                 logger("Object data couldn't be processed", LOGGER_DEBUG);
 671                                 return;
 672                         }
 673                 } else {
 674                         if (in_array($activity['type'], ['Accept'])) {
 675                                 $item['object'] = self::processElement($activity, 'object', 'actor', 'type', 'Follow');
 676                         } elseif (in_array($activity['type'], ['Undo'])) {
 677                                 $item['object'] = self::processElement($activity, 'object', 'object', 'type', 'Follow');
 678                         } else {
 679                                 $item['object'] = $object_url;
 680                         }
 681                         $item['id'] = $activity['id'];
 682                         $item['receiver'] = [];
 683                         $item['type'] = $activity['type'];
 684                 }
 685
 686                 $item = self::addActivityFields($item, $activity);
 687
 688                 $item['owner'] = $actor;
 689
 690                 $item['receiver'] = array_merge($item['receiver'], $receivers);
 691
 692                 switch ($activity['type']) {
 693                         case 'Create':
 694                         case 'Update':
 695                         case 'Announce':
 696                                 self::createItem($item, $body);
 697                                 break;
 698
 699                         case 'Like':
 700                                 self::likeItem($item, $body);
 701                                 break;
 702
 703                         case 'Dislike':
 704                                 break;
 705
 706                         case 'Delete':
 707                                 break;
 708
 709                         case 'Follow':
 710                                 self::followUser($item);
 711                                 break;
 712
 713                         case 'Accept':
 714                                 self::acceptFollowUser($item);
 715                                 break;
 716
 717                         case 'Undo':
 718                                 self::undoFollowUser($item);
 719                                 break;
 720
 721                         default:
 722                                 logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
 723                                 break;
 724                 }
 725         }
 726
 727         private static function getReceivers($activity)
 728         {
 729                 $receivers = [];
 730
 731                 $elements = ['to', 'cc', 'bto', 'bcc'];
 732                 foreach ($elements as $element) {
 733                         if (empty($activity[$element])) {
 734                                 continue;
 735                         }
 736
 737                         // The receiver can be an arror or a string
 738                         if (is_string($activity[$element])) {
 739                                 $activity[$element] = [$activity[$element]];
 740                         }
 741
 742                         foreach ($activity[$element] as $receiver) {
 743                                 if ($receiver == self::PUBLIC) {
 744                                         $receivers[$receiver] = 0;
 745                                 }
 746
 747                                 $condition = ['self' => true, 'nurl' => normalise_link($receiver)];
 748                                 $contact = DBA::selectFirst('contact', ['uid'], $condition);
 749                                 if (!DBA::isResult($contact)) {
 750                                         continue;
 751                                 }
 752                                 $receivers[$receiver] = $contact['uid'];
 753                         }
 754                 }
 755                 return $receivers;
 756         }
 757
 758         private static function addActivityFields($item, $activity)
 759         {
 760                 if (!empty($activity['published']) && empty($item['published'])) {
 761                         $item['published'] = $activity['published'];
 762                 }
 763
 764                 if (!empty($activity['updated']) && empty($item['updated'])) {
 765                         $item['updated'] = $activity['updated'];
 766                 }
 767
 768                 if (!empty($activity['inReplyTo']) && empty($item['parent-uri'])) {
 769                         $item['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
 770                 }
 771
 772                 if (!empty($activity['instrument'])) {
 773                         $item['service'] = self::processElement($activity, 'instrument', 'name', 'type', 'Service');
 774                 }
 775                 return $item;
 776         }
 777
 778         private static function fetchObject($object_url, $object = [])
 779         {
 780                 $data = self::fetchContent($object_url);
 781                 if (empty($data)) {
 782                         $data = $object;
 783                         if (empty($data)) {
 784                                 logger('Empty content', LOGGER_DEBUG);
 785                                 return false;
 786                         } elseif (is_string($data)) {
 787                                 logger('No object array provided.', LOGGER_DEBUG);
 788                                 $item = Item::selectFirst([], ['uri' => $data]);
 789                                 if (!DBA::isResult($item)) {
 790                                         logger('Object with url ' . $data . ' was not found locally.', LOGGER_DEBUG);
 791                                         return false;
 792                                 }
 793                                 logger('Using already stored item', LOGGER_DEBUG);
 794                                 $data = self::createNote($item);
 795                         } else {
 796                                 logger('Using provided object', LOGGER_DEBUG);
 797                         }
 798                 }
 799
 800                 if (empty($data['type'])) {
 801                         logger('Empty type', LOGGER_DEBUG);
 802                         return false;
 803                 } else {
 804                         $type = $data['type'];
 805                         logger('Type ' . $type, LOGGER_DEBUG);
 806                 }
 807
 808                 if (in_array($type, ['Note', 'Article', 'Video'])) {
 809                         $common = self::processCommonData($data);
 810                 }
 811
 812                 switch ($type) {
 813                         case 'Note':
 814                                 return array_merge($common, self::processNote($data));
 815                         case 'Article':
 816                                 return array_merge($common, self::processArticle($data));
 817                         case 'Video':
 818                                 return array_merge($common, self::processVideo($data));
 819
 820                         case 'Announce':
 821                                 if (empty($data['object'])) {
 822                                         return false;
 823                                 }
 824                                 return self::fetchObject($data['object']);
 825
 826                         case 'Person':
 827                         case 'Tombstone':
 828                                 break;
 829
 830                         default:
 831                                 logger('Unknown object type: ' . $data['type'], LOGGER_DEBUG);
 832                                 break;
 833                 }
 834         }
 835
 836         private static function processCommonData(&$object)
 837         {
 838                 if (empty($object['id']) || empty($object['attributedTo'])) {
 839                         return false;
 840                 }
 841
 842                 $item = [];
 843                 $item['type'] = $object['type'];
 844                 $item['uri'] = $object['id'];
 845
 846                 if (!empty($object['inReplyTo'])) {
 847                         $item['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
 848                 } else {
 849                         $item['reply-to-uri'] = $item['uri'];
 850                 }
 851
 852                 $item['published'] = defaults($object, 'published', null);
 853                 $item['updated'] = defaults($object, 'updated', $item['published']);
 854
 855                 if (empty($item['published']) && !empty($item['updated'])) {
 856                         $item['published'] = $item['updated'];
 857                 }
 858
 859                 $item['uuid'] = defaults($object, 'uuid', null);
 860                 $item['owner'] = $item['author'] = self::processElement($object, 'attributedTo', 'id');
 861                 $item['context'] = defaults($object, 'context', null);
 862                 $item['conversation'] = defaults($object, 'conversation', null);
 863                 $item['sensitive'] = defaults($object, 'sensitive', null);
 864                 $item['name'] = defaults($object, 'title', null);
 865                 $item['name'] = defaults($object, 'name', $item['name']);
 866                 $item['summary'] = defaults($object, 'summary', null);
 867                 $item['content'] = defaults($object, 'content', null);
 868                 $item['source'] = defaults($object, 'source', null);
 869                 $item['location'] = self::processElement($object, 'location', 'name', 'type', 'Place');
 870                 $item['attachments'] = defaults($object, 'attachment', null);
 871                 $item['tags'] = defaults($object, 'tag', null);
 872                 $item['service'] = self::processElement($object, 'instrument', 'name', 'type', 'Service');
 873                 $item['alternate-url'] = self::processElement($object, 'url', 'href');
 874                 $item['receiver'] = self::getReceivers($object);
 875
 876 /*
 877                 // To-Do
 878                 unset($object['source']);
 879
 880                 // Unhandled
 881                 unset($object['@context']);
 882                 unset($object['type']);
 883                 unset($object['actor']);
 884                 unset($object['signature']);
 885                 unset($object['mediaType']);
 886                 unset($object['duration']);
 887                 unset($object['replies']);
 888                 unset($object['icon']);
 889
 890                 // Also missing:
 891                 audience, preview, endTime, startTime, generator, image
 892 */
 893                 return $item;
 894         }
 895
 896         private static function processNote($object)
 897         {
 898                 $item = [];
 899
 900 /*
 901                 // To-Do?
 902                 unset($object['emoji']);
 903                 unset($object['atomUri']);
 904                 unset($object['inReplyToAtomUri']);
 905
 906                 // Unhandled
 907                 unset($object['contentMap']);
 908                 unset($object['announcement_count']);
 909                 unset($object['announcements']);
 910                 unset($object['context_id']);
 911                 unset($object['likes']);
 912                 unset($object['like_count']);
 913                 unset($object['inReplyToStatusId']);
 914                 unset($object['shares']);
 915                 unset($object['quoteUrl']);
 916                 unset($object['statusnetConversationId']);
 917 */
 918                 return $item;
 919         }
 920
 921         private static function processArticle($object)
 922         {
 923                 $item = [];
 924
 925                 return $item;
 926         }
 927
 928         private static function processVideo($object)
 929         {
 930                 $item = [];
 931 /*
 932                 // To-Do?
 933                 unset($object['category']);
 934                 unset($object['licence']);
 935                 unset($object['language']);
 936                 unset($object['commentsEnabled']);
 937
 938                 // Unhandled
 939                 unset($object['views']);
 940                 unset($object['waitTranscoding']);
 941                 unset($object['state']);
 942                 unset($object['support']);
 943                 unset($object['subtitleLanguage']);
 944                 unset($object['likes']);
 945                 unset($object['dislikes']);
 946                 unset($object['shares']);
 947                 unset($object['comments']);
 948 */
 949                 return $item;
 950         }
 951
 952         private static function processElement($array, $element, $key, $type = null, $type_value = null)
 953         {
 954                 if (empty($array)) {
 955                         return false;
 956                 }
 957
 958                 if (empty($array[$element])) {
 959                         return false;
 960                 }
 961
 962                 if (is_string($array[$element])) {
 963                         return $array[$element];
 964                 }
 965
 966                 if (is_null($type_value)) {
 967                         if (!empty($array[$element][$key])) {
 968                                 return $array[$element][$key];
 969                         }
 970
 971                         if (!empty($array[$element][0][$key])) {
 972                                 return $array[$element][0][$key];
 973                         }
 974
 975                         return false;
 976                 }
 977
 978                 if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) {
 979                         return $array[$element][$key];
 980                 }
 981
 982                 /// @todo Add array search
 983
 984                 return false;
 985         }
 986
 987         private static function convertMentions($body)
 988         {
 989                 $URLSearchString = "^\[\]";
 990                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
 991
 992                 return $body;
 993         }
 994
 995         private static function constructTagList($tags, $sensitive)
 996         {
 997                 if (empty($tags)) {
 998                         return '';
 999                 }
1000
1001                 $tag_text = '';
1002                 foreach ($tags as $tag) {
1003                         if (in_array($tag['type'], ['Mention', 'Hashtag'])) {
1004                                 if (!empty($tag_text)) {
1005                                         $tag_text .= ',';
1006                                 }
1007
1008                                 $tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
1009                         }
1010                 }
1011
1012                 /// @todo add nsfw for $sensitive
1013
1014                 return $tag_text;
1015         }
1016
1017         private static function constructAttachList($attachments, $item)
1018         {
1019                 if (empty($attachments)) {
1020                         return $item;
1021                 }
1022
1023                 foreach ($attachments as $attach) {
1024                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
1025                         if ($filetype == 'image') {
1026                                 $item['body'] .= "\n[img]".$attach['url'].'[/img]';
1027                         } else {
1028                                 if (!empty($item["attach"])) {
1029                                         $item["attach"] .= ',';
1030                                 } else {
1031                                         $item["attach"] = '';
1032                                 }
1033                                 if (!isset($attach['length'])) {
1034                                         $attach['length'] = "0";
1035                                 }
1036                                 $item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
1037                         }
1038                 }
1039
1040                 return $item;
1041         }
1042
1043         private static function createItem($activity, $body)
1044         {
1045                 $item = [];
1046                 $item['verb'] = ACTIVITY_POST;
1047                 $item['parent-uri'] = $activity['reply-to-uri'];
1048
1049                 if ($activity['reply-to-uri'] == $activity['uri']) {
1050                         $item['gravity'] = GRAVITY_PARENT;
1051                         $item['object-type'] = ACTIVITY_OBJ_NOTE;
1052                 } else {
1053                         $item['gravity'] = GRAVITY_COMMENT;
1054                         $item['object-type'] = ACTIVITY_OBJ_COMMENT;
1055                 }
1056
1057                 self::postItem($activity, $item, $body);
1058         }
1059
1060         private static function likeItem($activity, $body)
1061         {
1062                 $item = [];
1063                 $item['verb'] = ACTIVITY_LIKE;
1064                 $item['parent-uri'] = $activity['object'];
1065                 $item['gravity'] = GRAVITY_ACTIVITY;
1066                 $item['object-type'] = ACTIVITY_OBJ_NOTE;
1067
1068                 self::postItem($activity, $item, $body);
1069         }
1070
1071         private static function postItem($activity, $item, $body)
1072         {
1073                 /// @todo What to do with $activity['context']?
1074
1075                 $item['network'] = Protocol::ACTIVITYPUB;
1076                 $item['private'] = !in_array(0, $activity['receiver']);
1077                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
1078                 $item['owner-id'] = Contact::getIdForURL($activity['owner'], 0, true);
1079                 $item['uri'] = $activity['uri'];
1080                 $item['created'] = $activity['published'];
1081                 $item['edited'] = $activity['updated'];
1082                 $item['guid'] = $activity['uuid'];
1083                 $item['title'] = HTML::toBBCode($activity['name']);
1084                 $item['content-warning'] = HTML::toBBCode($activity['summary']);
1085                 $item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
1086                 $item['location'] = $activity['location'];
1087                 $item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
1088                 $item['app'] = $activity['service'];
1089                 $item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
1090
1091                 $item = self::constructAttachList($activity['attachments'], $item);
1092
1093                 $source = self::processElement($activity, 'source', 'content', 'mediaType', 'text/bbcode');
1094                 if (!empty($source)) {
1095                         $item['body'] = $source;
1096                 }
1097
1098                 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
1099                 $item['source'] = $body;
1100                 $item['conversation-uri'] = $activity['conversation'];
1101
1102                 foreach ($activity['receiver'] as $receiver) {
1103                         $item['uid'] = $receiver;
1104                         $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
1105
1106                         if (($receiver != 0) && empty($item['contact-id'])) {
1107                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
1108                         }
1109
1110                         $item_id = Item::insert($item);
1111                         logger('Storing for user ' . $item['uid'] . ': ' . $item_id);
1112                         if (!empty($item_id) && ($item['uid'] == 0)) {
1113                                 Item::distribute($item_id);
1114                         }
1115                 }
1116         }
1117
1118         private static function followUser($activity)
1119         {
1120                 if (empty($activity['receiver'][$activity['object']])) {
1121                         return;
1122                 }
1123
1124                 $uid = $activity['receiver'][$activity['object']];
1125                 $owner = User::getOwnerDataById($uid);
1126
1127                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1128                 if (!empty($cid)) {
1129                         $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1130                 } else {
1131                         $contact = false;
1132                 }
1133
1134                 $item = ['author-id' => Contact::getIdForURL($activity['owner']),
1135                         'author-link' => $activity['owner']];
1136
1137                 Contact::addRelationship($owner, $contact, $item);
1138                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1139                 if (empty($cid)) {
1140                         return;
1141                 }
1142
1143                 $contact = DBA::selectFirst('contact', ['network'], ['id' => $cid]);
1144                 if ($contact['network'] != Protocol::ACTIVITYPUB) {
1145                         Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
1146                 }
1147
1148                 DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
1149                 logger('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1150         }
1151
1152         private static function acceptFollowUser($activity)
1153         {
1154                 if (empty($activity['receiver'][$activity['object']])) {
1155                         return;
1156                 }
1157
1158                 $uid = $activity['receiver'][$activity['object']];
1159                 $owner = User::getOwnerDataById($uid);
1160
1161                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1162                 if (empty($cid)) {
1163                         logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
1164                         return;
1165                 }
1166
1167                 $fields = ['pending' => false];
1168
1169                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1170                 if ($contact['rel'] == Contact::FOLLOWER) {
1171                         $fields['rel'] = Contact::FRIEND;
1172                 }
1173
1174                 $condition = ['id' => $cid];
1175                 DBA::update('contact', $fields, $condition);
1176                 logger('Accept contact request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
1177         }
1178
1179         private static function undoFollowUser($activity)
1180         {
1181                 if (empty($activity['receiver'][$activity['object']])) {
1182                         return;
1183                 }
1184
1185                 $uid = $activity['receiver'][$activity['object']];
1186                 $owner = User::getOwnerDataById($uid);
1187
1188                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1189                 if (empty($cid)) {
1190                         logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
1191                         return;
1192                 }
1193
1194                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1195                 if (!DBA::isResult($contact)) {
1196                         return;
1197                 }
1198
1199                 Contact::removeFollower($owner, $contact);
1200                 logger('Undo following request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
1201         }
1202 }