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  * https://framagit.org/macgirvin/osada
  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  * - General cleanup
  53  */
  54 class ActivityPub
  55 {
  56         const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
  57
  58         public static function transmit($data, $target, $uid)
  59         {
  60                 $owner = User::getOwnerDataById($uid);
  61
  62                 if (!$owner) {
  63                         return;
  64                 }
  65
  66                 $content = json_encode($data);
  67
  68                 $host = parse_url($target, PHP_URL_HOST);
  69                 $path = parse_url($target, PHP_URL_PATH);
  70                 $date = date('r');
  71
  72                 $headers = ['Host: ' . $host, 'Date: ' . $date];
  73
  74                 $signed_data = "(request-target): post " . $path . "\nhost: " . $host . "\ndate: " . $date;
  75
  76                 $signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
  77
  78                 $headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",headers="(request-target) host date",signature="' . $signature . '"';
  79                 $headers[] = 'Content-Type: application/activity+json';
  80
  81                 Network::post($target, $content, $headers);
  82                 $return_code = BaseObject::getApp()->get_curl_code();
  83
  84                 logger('Transmit to ' . $target . ' returned ' . $return_code);
  85         }
  86
  87         /**
  88          * Return the ActivityPub profile of the given user
  89          *
  90          * @param integer $uid User ID
  91          * @return array
  92          */
  93         public static function profile($uid)
  94         {
  95                 $accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  96
  97                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
  98                         'account_removed' => false, 'verified' => true];
  99                 $fields = ['guid', 'nickname', 'pubkey', 'account-type'];
 100                 $user = DBA::selectFirst('user', $fields, $condition);
 101                 if (!DBA::isResult($user)) {
 102                         return [];
 103                 }
 104
 105                 $fields = ['locality', 'region', 'country-name'];
 106                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 107                 if (!DBA::isResult($profile)) {
 108                         return [];
 109                 }
 110
 111                 $fields = ['name', 'url', 'location', 'about', 'avatar'];
 112                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 113                 if (!DBA::isResult($contact)) {
 114                         return [];
 115                 }
 116
 117                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 118                         ['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
 119                         'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
 120
 121                 $data['id'] = $contact['url'];
 122                 $data['uuid'] = $user['guid'];
 123                 $data['type'] = $accounttype[$user['account-type']];
 124                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 125                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 126                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 127                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 128                 $data['preferredUsername'] = $user['nickname'];
 129                 $data['name'] = $contact['name'];
 130                 $data['vcard:hasAddress'] = ['@type' => 'Home', 'vcard:country-name' => $profile['country-name'],
 131                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 132                 $data['summary'] = $contact['about'];
 133                 $data['url'] = $contact['url'];
 134                 $data['manuallyApprovesFollowers'] = false;
 135                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 136                         'owner' => $contact['url'],
 137                         'publicKeyPem' => $user['pubkey']];
 138                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 139                 $data['icon'] = ['type' => 'Image',
 140                         'url' => $contact['avatar']];
 141
 142                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 143                 return $data;
 144         }
 145
 146         public static function createActivityFromItem($item_id)
 147         {
 148                 $item = Item::selectFirst([], ['id' => $item_id]);
 149
 150                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 151                         ['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
 152                         'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
 153                         'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
 154                         'toot' => 'http://joinmastodon.org/ns#']]];
 155
 156                 $data['type'] = 'Create';
 157                 $data['id'] = $item['uri'];
 158                 $data['actor'] = $item['author-link'];
 159                 $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
 160                 $data['object'] = self::createNote($item);
 161                 return $data;
 162         }
 163
 164         public static function createNote($item)
 165         {
 166                 $data = [];
 167                 $data['type'] = 'Note';
 168                 $data['id'] = $item['uri'];
 169
 170                 if ($item['uri'] != $item['thr-parent']) {
 171                         $data['inReplyTo'] = $item['thr-parent'];
 172                 }
 173
 174                 $conversation = DBA::selectFirst('conversation', ['conversation-uri'], ['item-uri' => $item['parent-uri']]);
 175                 if (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 176                         $conversation_uri = $conversation['conversation-uri'];
 177                 } else {
 178                         $conversation_uri = $item['parent-uri'];
 179                 }
 180
 181                 $data['context'] = $data['conversation'] = $conversation_uri;
 182                 $data['actor'] = $item['author-link'];
 183                 $data['to'] = [];
 184                 if (!$item['private']) {
 185                         $data['to'][] = 'https://www.w3.org/ns/activitystreams#Public';
 186                 }
 187                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 188                 $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 189                 $data['attributedTo'] = $item['author-link'];
 190                 $data['name'] = BBCode::convert($item['title'], false, 7);
 191                 $data['content'] = BBCode::convert($item['body'], false, 7);
 192                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 193                 //$data['summary'] = ''; // Ignore by now
 194                 //$data['sensitive'] = false; // - Query NSFW
 195                 //$data['emoji'] = []; // Ignore by now
 196                 //$data['tag'] = []; /// @ToDo
 197                 //$data['attachment'] = []; // @ToDo
 198                 return $data;
 199         }
 200
 201         public static function transmitActivity($activity, $target, $uid)
 202         {
 203                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 204
 205                 $owner = User::getOwnerDataById($uid);
 206
 207                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 208                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 209                         'type' => $activity,
 210                         'actor' => $owner['url'],
 211                         'object' => $profile['url']];
 212
 213                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 214                 return self::transmit($data,  $profile['notify'], $uid);
 215         }
 216
 217         public static function transmitContactAccept($target, $id, $uid)
 218         {
 219                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 220
 221                 $owner = User::getOwnerDataById($uid);
 222                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 223                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 224                         'type' => 'Accept',
 225                         'actor' => $owner['url'],
 226                         'object' => ['id' => $id, 'type' => 'Follow',
 227                                 'actor' => $profile['url'],
 228                                 'object' => $owner['url']]];
 229
 230                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 231                 return self::transmit($data,  $profile['notify'], $uid);
 232         }
 233
 234         public static function transmitContactReject($target, $id, $uid)
 235         {
 236                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 237
 238                 $owner = User::getOwnerDataById($uid);
 239                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 240                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 241                         'type' => 'Reject',
 242                         'actor' => $owner['url'],
 243                         'object' => ['id' => $id, 'type' => 'Follow',
 244                                 'actor' => $profile['url'],
 245                                 'object' => $owner['url']]];
 246
 247                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 248                 return self::transmit($data,  $profile['notify'], $uid);
 249         }
 250
 251         public static function transmitContactUndo($target, $uid)
 252         {
 253                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 254
 255                 $id = System::baseUrl() . '/activity/' . System::createGUID();
 256
 257                 $owner = User::getOwnerDataById($uid);
 258                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 259                         'id' => $id,
 260                         'type' => 'Undo',
 261                         'actor' => $owner['url'],
 262                         'object' => ['id' => $id, 'type' => 'Follow',
 263                                 'actor' => $owner['url'],
 264                                 'object' => $profile['url']]];
 265
 266                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 267                 return self::transmit($data,  $profile['notify'], $uid);
 268         }
 269
 270         /**
 271          * Fetches ActivityPub content from the given url
 272          *
 273          * @param string $url content url
 274          * @return array
 275          */
 276         public static function fetchContent($url)
 277         {
 278                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json']);
 279
 280                 if (!$ret['success'] || empty($ret['body'])) {
 281                         return;
 282                 }
 283
 284                 return json_decode($ret['body'], true);
 285         }
 286
 287         /**
 288          * Resolves the profile url from the address by using webfinger
 289          *
 290          * @param string $addr profile address (user@domain.tld)
 291          * @return string url
 292          */
 293         private static function addrToUrl($addr)
 294         {
 295                 $addr_parts = explode('@', $addr);
 296                 if (count($addr_parts) != 2) {
 297                         return false;
 298                 }
 299
 300                 $webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
 301
 302                 $ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
 303                 if (!$ret['success'] || empty($ret['body'])) {
 304                         return false;
 305                 }
 306
 307                 $data = json_decode($ret['body'], true);
 308
 309                 if (empty($data['links'])) {
 310                         return false;
 311                 }
 312
 313                 foreach ($data['links'] as $link) {
 314                         if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
 315                                 continue;
 316                         }
 317
 318                         if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
 319                                 return $link['href'];
 320                         }
 321                 }
 322
 323                 return false;
 324         }
 325
 326         public static function verifySignature($content, $http_headers)
 327         {
 328                 $object = json_decode($content, true);
 329
 330                 if (empty($object)) {
 331                         return false;
 332                 }
 333
 334                 $actor = self::processElement($object, 'actor', 'id');
 335
 336                 $headers = [];
 337                 $headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
 338
 339                 // First take every header
 340                 foreach ($http_headers as $k => $v) {
 341                         $field = str_replace('_', '-', strtolower($k));
 342                         $headers[$field] = $v;
 343                 }
 344
 345                 // Now add every http header
 346                 foreach ($http_headers as $k => $v) {
 347                         if (strpos($k, 'HTTP_') === 0) {
 348                                 $field = str_replace('_', '-', strtolower(substr($k, 5)));
 349                                 $headers[$field] = $v;
 350                         }
 351                 }
 352
 353                 $sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
 354
 355                 if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
 356                         return false;
 357                 }
 358
 359                 $signed_data = '';
 360                 foreach ($sig_block['headers'] as $h) {
 361                         if (array_key_exists($h, $headers)) {
 362                                 $signed_data .= $h . ': ' . $headers[$h] . "\n";
 363                         }
 364                 }
 365                 $signed_data = rtrim($signed_data, "\n");
 366
 367                 if (empty($signed_data)) {
 368                         return false;
 369                 }
 370
 371                 $algorithm = null;
 372
 373                 if ($sig_block['algorithm'] === 'rsa-sha256') {
 374                         $algorithm = 'sha256';
 375                 }
 376
 377                 if ($sig_block['algorithm'] === 'rsa-sha512') {
 378                         $algorithm = 'sha512';
 379                 }
 380
 381                 if (empty($algorithm)) {
 382                         return false;
 383                 }
 384
 385                 $key = self::fetchKey($sig_block['keyId'], $actor);
 386
 387                 if (empty($key)) {
 388                         return false;
 389                 }
 390
 391                 if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
 392                         return false;
 393                 }
 394
 395                 // Check the digest if it was part of the signed data
 396                 if (in_array('digest', $sig_block['headers'])) {
 397                         $digest = explode('=', $headers['digest'], 2);
 398                         if ($digest[0] === 'SHA-256') {
 399                                 $hashalg = 'sha256';
 400                         }
 401                         if ($digest[0] === 'SHA-512') {
 402                                 $hashalg = 'sha512';
 403                         }
 404
 405                         /// @todo add all hashes from the rfc
 406
 407                         if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
 408                                 return false;
 409                         }
 410                 }
 411
 412                 // Check the content-length if it was part of the signed data
 413                 if (in_array('content-length', $sig_block['headers'])) {
 414                         if (strlen($content) != $headers['content-length']) {
 415                                 return false;
 416                         }
 417                 }
 418
 419                 return true;
 420
 421         }
 422
 423         private static function fetchKey($id, $actor)
 424         {
 425                 $url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
 426
 427                 $profile = Probe::uri($url, Protocol::ACTIVITYPUB);
 428                 if (!empty($profile)) {
 429                         return $profile['pubkey'];
 430                 } elseif ($url != $actor) {
 431                         $profile = Probe::uri($actor, Protocol::ACTIVITYPUB);
 432                         if (!empty($profile)) {
 433                                 return $profile['pubkey'];
 434                         }
 435                 }
 436
 437                 return false;
 438         }
 439
 440         /**
 441          * @brief
 442          *
 443          * @param string $header
 444          * @return array associate array with
 445          *   - \e string \b keyID
 446          *   - \e string \b algorithm
 447          *   - \e array  \b headers
 448          *   - \e string \b signature
 449          */
 450         private static function parseSigHeader($header)
 451         {
 452                 $ret = [];
 453                 $matches = [];
 454
 455                 if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
 456                         $ret['keyId'] = $matches[1];
 457                 }
 458
 459                 if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
 460                         $ret['algorithm'] = $matches[1];
 461                 }
 462
 463                 if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
 464                         $ret['headers'] = explode(' ', $matches[1]);
 465                 }
 466
 467                 if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
 468                         $ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
 469                 }
 470
 471                 return $ret;
 472         }
 473
 474         /**
 475          * Fetches a profile from the given url
 476          *
 477          * @param string $url profile url
 478          * @return array
 479          */
 480         public static function fetchProfile($url)
 481         {
 482                 if (empty(parse_url($url, PHP_URL_SCHEME))) {
 483                         $url = self::addrToUrl($url);
 484                         if (empty($url)) {
 485                                 return false;
 486                         }
 487                 }
 488
 489                 $data = self::fetchContent($url);
 490
 491                 if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
 492                         return false;
 493                 }
 494
 495                 $profile = ['network' => Protocol::ACTIVITYPUB];
 496                 $profile['nick'] = $data['preferredUsername'];
 497                 $profile['name'] = defaults($data, 'name', $profile['nick']);
 498                 $profile['guid'] = defaults($data, 'uuid', null);
 499                 $profile['url'] = $data['id'];
 500
 501                 $parts = parse_url($profile['url']);
 502                 unset($parts['scheme']);
 503                 unset($parts['path']);
 504                 $profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 505                 $profile['alias'] = self::processElement($data, 'url', 'href');
 506                 $profile['photo'] = self::processElement($data, 'icon', 'url');
 507                 // $profile['community']
 508                 // $profile['keywords']
 509                 // $profile['location']
 510                 $profile['about'] = defaults($data, 'summary', '');
 511                 $profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
 512                 $profile['notify'] = $data['inbox'];
 513                 $profile['poll'] = $data['outbox'];
 514                 $profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
 515
 516                 // Check if the address is resolvable
 517                 if (self::addrToUrl($profile['addr']) == $profile['url']) {
 518                         $parts = parse_url($profile['url']);
 519                         unset($parts['path']);
 520                         $profile['baseurl'] = Network::unparseURL($parts);
 521                 } else {
 522                         unset($profile['addr']);
 523                 }
 524
 525                 if ($profile['url'] == $profile['alias']) {
 526                         unset($profile['alias']);
 527                 }
 528
 529                 // Remove all "null" fields
 530                 foreach ($profile as $field => $content) {
 531                         if (is_null($content)) {
 532                                 unset($profile[$field]);
 533                         }
 534                 }
 535
 536 /*
 537                 // To-Do
 538                 unset($data['type']);
 539                 unset($data['manuallyApprovesFollowers']);
 540
 541                 // Unhandled
 542                 unset($data['@context']);
 543                 unset($data['tag']);
 544                 unset($data['attachment']);
 545                 unset($data['image']);
 546                 unset($data['nomadicLocations']);
 547                 unset($data['signature']);
 548                 unset($data['following']);
 549                 unset($data['followers']);
 550                 unset($data['featured']);
 551                 unset($data['movedTo']);
 552                 unset($data['liked']);
 553                 unset($data['sharedInbox']); // Misskey
 554                 unset($data['isCat']); // Misskey
 555                 unset($data['kroeg:blocks']); // Kroeg
 556                 unset($data['updated']); // Kroeg
 557 */
 558                 return $profile;
 559         }
 560
 561         public static function processInbox($body, $header, $uid)
 562         {
 563                 logger('Incoming message for user ' . $uid, LOGGER_DEBUG);
 564
 565                 if (!self::verifySignature($body, $header)) {
 566                         logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
 567                         return;
 568                 }
 569
 570                 $activity = json_decode($body, true);
 571
 572                 if (!is_array($activity)) {
 573                         logger('Invalid body.', LOGGER_DEBUG);
 574                         return;
 575                 }
 576
 577                 self::processActivity($activity, $body, $uid);
 578         }
 579
 580         public static function fetchOutbox($url)
 581         {
 582                 $data = self::fetchContent($url);
 583                 if (empty($data)) {
 584                         return;
 585                 }
 586
 587                 if (!empty($data['orderedItems'])) {
 588                         $items = $data['orderedItems'];
 589                 } elseif (!empty($data['first']['orderedItems'])) {
 590                         $items = $data['first']['orderedItems'];
 591                 } elseif (!empty($data['first'])) {
 592                         self::fetchOutbox($data['first']);
 593                         return;
 594                 } else {
 595                         $items = [];
 596                 }
 597
 598                 foreach ($items as $activity) {
 599                         self::processActivity($activity);
 600                 }
 601         }
 602
 603         function processActivity($activity, $body = '', $uid = null)
 604         {
 605                 if (empty($activity['type'])) {
 606                         logger('Empty type', LOGGER_DEBUG);
 607                         return;
 608                 }
 609
 610                 if (empty($activity['object'])) {
 611                         logger('Empty object', LOGGER_DEBUG);
 612                         return;
 613                 }
 614
 615                 if (empty($activity['actor'])) {
 616                         logger('Empty actor', LOGGER_DEBUG);
 617                         return;
 618
 619                 }
 620
 621                 $actor = self::processElement($activity, 'actor', 'id');
 622                 if (empty($actor)) {
 623                         logger('Empty actor - 2', LOGGER_DEBUG);
 624                         return;
 625                 }
 626
 627                 if (is_string($activity['object'])) {
 628                         $object_url = $activity['object'];
 629                 } elseif (!empty($activity['object']['id'])) {
 630                         $object_url = $activity['object']['id'];
 631                 } else {
 632                         logger('No object found', LOGGER_DEBUG);
 633                         return;
 634                 }
 635
 636                 // ----------------------------------
 637 /*
 638                 // unhandled
 639                 unset($activity['@context']);
 640                 unset($activity['id']);
 641
 642                 // Non standard
 643                 unset($activity['title']);
 644                 unset($activity['atomUri']);
 645                 unset($activity['context_id']);
 646                 unset($activity['statusnetConversationId']);
 647
 648                 // To-Do?
 649                 unset($activity['context']);
 650                 unset($activity['location']);
 651                 unset($activity['signature']);
 652 */
 653                 // Fetch all receivers from to, cc, bto and bcc
 654                 $receivers = self::getReceivers($activity);
 655
 656                 // When it is a delivery to a personal inbox we add that user to the receivers
 657                 if (!empty($uid)) {
 658                         $owner = User::getOwnerDataById($uid);
 659                         $additional = [$owner['url'] => $uid];
 660                         $receivers = array_merge($receivers, $additional);
 661                 }
 662
 663                 logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
 664
 665                 logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
 666
 667                 // Fetch the content only on activities where this matters
 668                 if (in_array($activity['type'], ['Create', 'Update', 'Announce'])) {
 669                         $item = self::fetchObject($object_url, $activity['object']);
 670                         if (empty($item)) {
 671                                 logger("Object data couldn't be processed", LOGGER_DEBUG);
 672                                 return;
 673                         }
 674                 } else {
 675                         if (in_array($activity['type'], ['Accept'])) {
 676                                 $item['object'] = self::processElement($activity, 'object', 'actor', 'type', 'Follow');
 677                         } elseif (in_array($activity['type'], ['Undo'])) {
 678                                 $item['object'] = self::processElement($activity, 'object', 'object', 'type', 'Follow');
 679                         } else {
 680                                 $item['uri'] = $activity['id'];
 681                                 $item['author'] = $activity['actor'];
 682                                 $item['updated'] = $item['published'] = $activity['published'];
 683                                 $item['uuid'] = '';
 684                                 $item['name'] = $activity['type'];
 685                                 $item['summary'] = '';
 686                                 $item['content'] = '';
 687                                 $item['location'] = '';
 688                                 $item['tags'] = [];
 689                                 $item['sensitive'] = false;
 690                                 $item['service'] = '';
 691                                 $item['attachments'] = [];
 692                                 $item['conversation'] = '';
 693                                 $item['object'] = $object_url;
 694                         }
 695                         $item['id'] = $activity['id'];
 696                         $item['receiver'] = [];
 697                         $item['type'] = $activity['type'];
 698                 }
 699
 700                 $item = self::addActivityFields($item, $activity);
 701
 702                 $item['owner'] = $actor;
 703
 704                 $item['receiver'] = array_merge($item['receiver'], $receivers);
 705
 706                 switch ($activity['type']) {
 707                         case 'Create':
 708                         case 'Update':
 709                         case 'Announce':
 710                                 self::createItem($item, $body);
 711                                 break;
 712
 713                         case 'Like':
 714                                 self::likeItem($item, $body);
 715                                 break;
 716
 717                         case 'Dislike':
 718                                 break;
 719
 720                         case 'Delete':
 721                                 break;
 722
 723                         case 'Follow':
 724                                 self::followUser($item);
 725                                 break;
 726
 727                         case 'Accept':
 728                                 self::acceptFollowUser($item);
 729                                 break;
 730
 731                         case 'Undo':
 732                                 self::undoFollowUser($item);
 733                                 break;
 734
 735                         default:
 736                                 logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
 737                                 break;
 738                 }
 739         }
 740
 741         private static function getReceivers($activity)
 742         {
 743                 $receivers = [];
 744
 745                 $elements = ['to', 'cc', 'bto', 'bcc'];
 746                 foreach ($elements as $element) {
 747                         if (empty($activity[$element])) {
 748                                 continue;
 749                         }
 750
 751                         // The receiver can be an arror or a string
 752                         if (is_string($activity[$element])) {
 753                                 $activity[$element] = [$activity[$element]];
 754                         }
 755
 756                         foreach ($activity[$element] as $receiver) {
 757                                 if ($receiver == self::PUBLIC) {
 758                                         $receivers[$receiver] = 0;
 759                                 }
 760
 761                                 $condition = ['self' => true, 'nurl' => normalise_link($receiver)];
 762                                 $contact = DBA::selectFirst('contact', ['uid'], $condition);
 763                                 if (!DBA::isResult($contact)) {
 764                                         continue;
 765                                 }
 766                                 $receivers[$receiver] = $contact['uid'];
 767                         }
 768                 }
 769                 return $receivers;
 770         }
 771
 772         private static function addActivityFields($item, $activity)
 773         {
 774                 if (!empty($activity['published']) && empty($item['published'])) {
 775                         $item['published'] = $activity['published'];
 776                 }
 777
 778                 if (!empty($activity['updated']) && empty($item['updated'])) {
 779                         $item['updated'] = $activity['updated'];
 780                 }
 781
 782                 if (!empty($activity['inReplyTo']) && empty($item['parent-uri'])) {
 783                         $item['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
 784                 }
 785
 786                 if (!empty($activity['instrument'])) {
 787                         $item['service'] = self::processElement($activity, 'instrument', 'name', 'type', 'Service');
 788                 }
 789                 return $item;
 790         }
 791
 792         private static function fetchObject($object_url, $object = [])
 793         {
 794                 $data = self::fetchContent($object_url);
 795                 if (empty($data)) {
 796                         $data = $object;
 797                         if (empty($data)) {
 798                                 logger('Empty content', LOGGER_DEBUG);
 799                                 return false;
 800                         } elseif (is_string($data)) {
 801                                 logger('No object array provided.', LOGGER_DEBUG);
 802                                 $item = Item::selectFirst([], ['uri' => $data]);
 803                                 if (!DBA::isResult($item)) {
 804                                         logger('Object with url ' . $data . ' was not found locally.', LOGGER_DEBUG);
 805                                         return false;
 806                                 }
 807                                 logger('Using already stored item', LOGGER_DEBUG);
 808                                 $data = self::createNote($item);
 809                         } else {
 810                                 logger('Using provided object', LOGGER_DEBUG);
 811                         }
 812                 }
 813
 814                 if (empty($data['type'])) {
 815                         logger('Empty type', LOGGER_DEBUG);
 816                         return false;
 817                 } else {
 818                         $type = $data['type'];
 819                         logger('Type ' . $type, LOGGER_DEBUG);
 820                 }
 821
 822                 if (in_array($type, ['Note', 'Article', 'Video'])) {
 823                         $common = self::processCommonData($data);
 824                 }
 825
 826                 switch ($type) {
 827                         case 'Note':
 828                                 return array_merge($common, self::processNote($data));
 829                         case 'Article':
 830                                 return array_merge($common, self::processArticle($data));
 831                         case 'Video':
 832                                 return array_merge($common, self::processVideo($data));
 833
 834                         case 'Announce':
 835                                 if (empty($data['object'])) {
 836                                         return false;
 837                                 }
 838                                 return self::fetchObject($data['object']);
 839
 840                         case 'Person':
 841                         case 'Tombstone':
 842                                 break;
 843
 844                         default:
 845                                 logger('Unknown object type: ' . $data['type'], LOGGER_DEBUG);
 846                                 break;
 847                 }
 848         }
 849
 850         private static function processCommonData(&$object)
 851         {
 852                 if (empty($object['id']) || empty($object['attributedTo'])) {
 853                         return false;
 854                 }
 855
 856                 $item = [];
 857                 $item['type'] = $object['type'];
 858                 $item['uri'] = $object['id'];
 859
 860                 if (!empty($object['inReplyTo'])) {
 861                         $item['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
 862                 } else {
 863                         $item['reply-to-uri'] = $item['uri'];
 864                 }
 865
 866                 $item['published'] = defaults($object, 'published', null);
 867                 $item['updated'] = defaults($object, 'updated', $item['published']);
 868
 869                 if (empty($item['published']) && !empty($item['updated'])) {
 870                         $item['published'] = $item['updated'];
 871                 }
 872
 873                 $item['uuid'] = defaults($object, 'uuid', null);
 874                 $item['owner'] = $item['author'] = self::processElement($object, 'attributedTo', 'id');
 875                 $item['context'] = defaults($object, 'context', null);
 876                 $item['conversation'] = defaults($object, 'conversation', null);
 877                 $item['sensitive'] = defaults($object, 'sensitive', null);
 878                 $item['name'] = defaults($object, 'title', null);
 879                 $item['name'] = defaults($object, 'name', $item['name']);
 880                 $item['summary'] = defaults($object, 'summary', null);
 881                 $item['content'] = defaults($object, 'content', null);
 882                 $item['source'] = defaults($object, 'source', null);
 883                 $item['location'] = self::processElement($object, 'location', 'name', 'type', 'Place');
 884                 $item['attachments'] = defaults($object, 'attachment', null);
 885                 $item['tags'] = defaults($object, 'tag', null);
 886                 $item['service'] = self::processElement($object, 'instrument', 'name', 'type', 'Service');
 887                 $item['alternate-url'] = self::processElement($object, 'url', 'href');
 888                 $item['receiver'] = self::getReceivers($object);
 889
 890 /*
 891                 // To-Do
 892                 unset($object['source']);
 893
 894                 // Unhandled
 895                 unset($object['@context']);
 896                 unset($object['type']);
 897                 unset($object['actor']);
 898                 unset($object['signature']);
 899                 unset($object['mediaType']);
 900                 unset($object['duration']);
 901                 unset($object['replies']);
 902                 unset($object['icon']);
 903
 904                 // Also missing:
 905                 audience, preview, endTime, startTime, generator, image
 906 */
 907                 return $item;
 908         }
 909
 910         private static function processNote($object)
 911         {
 912                 $item = [];
 913
 914 /*
 915                 // To-Do?
 916                 unset($object['emoji']);
 917                 unset($object['atomUri']);
 918                 unset($object['inReplyToAtomUri']);
 919
 920                 // Unhandled
 921                 unset($object['contentMap']);
 922                 unset($object['announcement_count']);
 923                 unset($object['announcements']);
 924                 unset($object['context_id']);
 925                 unset($object['likes']);
 926                 unset($object['like_count']);
 927                 unset($object['inReplyToStatusId']);
 928                 unset($object['shares']);
 929                 unset($object['quoteUrl']);
 930                 unset($object['statusnetConversationId']);
 931 */
 932                 return $item;
 933         }
 934
 935         private static function processArticle($object)
 936         {
 937                 $item = [];
 938
 939                 return $item;
 940         }
 941
 942         private static function processVideo($object)
 943         {
 944                 $item = [];
 945 /*
 946                 // To-Do?
 947                 unset($object['category']);
 948                 unset($object['licence']);
 949                 unset($object['language']);
 950                 unset($object['commentsEnabled']);
 951
 952                 // Unhandled
 953                 unset($object['views']);
 954                 unset($object['waitTranscoding']);
 955                 unset($object['state']);
 956                 unset($object['support']);
 957                 unset($object['subtitleLanguage']);
 958                 unset($object['likes']);
 959                 unset($object['dislikes']);
 960                 unset($object['shares']);
 961                 unset($object['comments']);
 962 */
 963                 return $item;
 964         }
 965
 966         private static function processElement($array, $element, $key, $type = null, $type_value = null)
 967         {
 968                 if (empty($array)) {
 969                         return false;
 970                 }
 971
 972                 if (empty($array[$element])) {
 973                         return false;
 974                 }
 975
 976                 if (is_string($array[$element])) {
 977                         return $array[$element];
 978                 }
 979
 980                 if (is_null($type_value)) {
 981                         if (!empty($array[$element][$key])) {
 982                                 return $array[$element][$key];
 983                         }
 984
 985                         if (!empty($array[$element][0][$key])) {
 986                                 return $array[$element][0][$key];
 987                         }
 988
 989                         return false;
 990                 }
 991
 992                 if (!empty($array[$element][$key]) && !empty($array[$element][$type]) && ($array[$element][$type] == $type_value)) {
 993                         return $array[$element][$key];
 994                 }
 995
 996                 /// @todo Add array search
 997
 998                 return false;
 999         }
1000
1001         private static function convertMentions($body)
1002         {
1003                 $URLSearchString = "^\[\]";
1004                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
1005
1006                 return $body;
1007         }
1008
1009         private static function constructTagList($tags, $sensitive)
1010         {
1011                 if (empty($tags)) {
1012                         return '';
1013                 }
1014
1015                 $tag_text = '';
1016                 foreach ($tags as $tag) {
1017                         if (in_array($tag['type'], ['Mention', 'Hashtag'])) {
1018                                 if (!empty($tag_text)) {
1019                                         $tag_text .= ',';
1020                                 }
1021
1022                                 $tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
1023                         }
1024                 }
1025
1026                 /// @todo add nsfw for $sensitive
1027
1028                 return $tag_text;
1029         }
1030
1031         private static function constructAttachList($attachments, $item)
1032         {
1033                 if (empty($attachments)) {
1034                         return $item;
1035                 }
1036
1037                 foreach ($attachments as $attach) {
1038                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
1039                         if ($filetype == 'image') {
1040                                 $item['body'] .= "\n[img]".$attach['url'].'[/img]';
1041                         } else {
1042                                 if (!empty($item["attach"])) {
1043                                         $item["attach"] .= ',';
1044                                 } else {
1045                                         $item["attach"] = '';
1046                                 }
1047                                 if (!isset($attach['length'])) {
1048                                         $attach['length'] = "0";
1049                                 }
1050                                 $item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
1051                         }
1052                 }
1053
1054                 return $item;
1055         }
1056
1057         private static function createItem($activity, $body)
1058         {
1059                 $item = [];
1060                 $item['verb'] = ACTIVITY_POST;
1061                 $item['parent-uri'] = $activity['reply-to-uri'];
1062
1063                 if ($activity['reply-to-uri'] == $activity['uri']) {
1064                         $item['gravity'] = GRAVITY_PARENT;
1065                         $item['object-type'] = ACTIVITY_OBJ_NOTE;
1066                 } else {
1067                         $item['gravity'] = GRAVITY_COMMENT;
1068                         $item['object-type'] = ACTIVITY_OBJ_COMMENT;
1069                 }
1070
1071                 self::postItem($activity, $item, $body);
1072         }
1073
1074         private static function likeItem($activity, $body)
1075         {
1076                 $item = [];
1077                 $item['verb'] = ACTIVITY_LIKE;
1078                 $item['parent-uri'] = $activity['object'];
1079                 $item['gravity'] = GRAVITY_ACTIVITY;
1080                 $item['object-type'] = ACTIVITY_OBJ_NOTE;
1081
1082                 self::postItem($activity, $item, $body);
1083         }
1084
1085         private static function postItem($activity, $item, $body)
1086         {
1087                 /// @todo What to do with $activity['context']?
1088
1089                 $item['network'] = Protocol::ACTIVITYPUB;
1090                 $item['private'] = !in_array(0, $activity['receiver']);
1091                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
1092                 $item['owner-id'] = Contact::getIdForURL($activity['owner'], 0, true);
1093                 $item['uri'] = $activity['uri'];
1094                 $item['created'] = $activity['published'];
1095                 $item['edited'] = $activity['updated'];
1096                 $item['guid'] = $activity['uuid'];
1097                 $item['title'] = HTML::toBBCode($activity['name']);
1098                 $item['content-warning'] = HTML::toBBCode($activity['summary']);
1099                 $item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
1100                 $item['location'] = $activity['location'];
1101                 $item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
1102                 $item['app'] = $activity['service'];
1103                 $item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
1104
1105                 $item = self::constructAttachList($activity['attachments'], $item);
1106
1107                 $source = self::processElement($activity, 'source', 'content', 'mediaType', 'text/bbcode');
1108                 if (!empty($source)) {
1109                         $item['body'] = $source;
1110                 }
1111
1112                 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
1113                 $item['source'] = $body;
1114                 $item['conversation-uri'] = $activity['conversation'];
1115
1116                 foreach ($activity['receiver'] as $receiver) {
1117                         $item['uid'] = $receiver;
1118                         $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
1119
1120                         if (($receiver != 0) && empty($item['contact-id'])) {
1121                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
1122                         }
1123
1124                         $item_id = Item::insert($item);
1125                         logger('Storing for user ' . $item['uid'] . ': ' . $item_id);
1126                         if (!empty($item_id) && ($item['uid'] == 0)) {
1127                                 Item::distribute($item_id);
1128                         }
1129                 }
1130         }
1131
1132         private static function followUser($activity)
1133         {
1134                 if (empty($activity['receiver'][$activity['object']])) {
1135                         return;
1136                 }
1137
1138                 $uid = $activity['receiver'][$activity['object']];
1139                 $owner = User::getOwnerDataById($uid);
1140
1141                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1142                 if (!empty($cid)) {
1143                         $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1144                 } else {
1145                         $contact = false;
1146                 }
1147
1148                 $item = ['author-id' => Contact::getIdForURL($activity['owner']),
1149                         'author-link' => $activity['owner']];
1150
1151                 Contact::addRelationship($owner, $contact, $item);
1152                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1153                 if (empty($cid)) {
1154                         return;
1155                 }
1156
1157                 $contact = DBA::selectFirst('contact', ['network'], ['id' => $cid]);
1158                 if ($contact['network'] != Protocol::ACTIVITYPUB) {
1159                         Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
1160                 }
1161
1162                 DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
1163                 logger('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1164         }
1165
1166         private static function acceptFollowUser($activity)
1167         {
1168                 if (empty($activity['receiver'][$activity['object']])) {
1169                         return;
1170                 }
1171
1172                 $uid = $activity['receiver'][$activity['object']];
1173                 $owner = User::getOwnerDataById($uid);
1174
1175                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1176                 if (empty($cid)) {
1177                         logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
1178                         return;
1179                 }
1180
1181                 $fields = ['pending' => false];
1182
1183                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1184                 if ($contact['rel'] == Contact::FOLLOWER) {
1185                         $fields['rel'] = Contact::FRIEND;
1186                 }
1187
1188                 $condition = ['id' => $cid];
1189                 DBA::update('contact', $fields, $condition);
1190                 logger('Accept contact request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
1191         }
1192
1193         private static function undoFollowUser($activity)
1194         {
1195                 if (empty($activity['receiver'][$activity['object']])) {
1196                         return;
1197                 }
1198
1199                 $uid = $activity['receiver'][$activity['object']];
1200                 $owner = User::getOwnerDataById($uid);
1201
1202                 $cid = Contact::getIdForURL($activity['owner'], $uid);
1203                 if (empty($cid)) {
1204                         logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
1205                         return;
1206                 }
1207
1208                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1209                 if (!DBA::isResult($contact)) {
1210                         return;
1211                 }
1212
1213                 Contact::removeFollower($owner, $contact);
1214                 logger('Undo following request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
1215         }
1216 }