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 class ActivityPub
  37 {
  38         const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
  39
  40         public static function transmit($data, $target, $uid)
  41         {
  42                 $owner = User::getOwnerDataById($uid);
  43
  44                 if (!$owner) {
  45                         return;
  46                 }
  47
  48                 $content = json_encode($data);
  49
  50                 $host = parse_url($target, PHP_URL_HOST);
  51                 $path = parse_url($target, PHP_URL_PATH);
  52                 $date = date('r');
  53
  54                 $headers = ['Host: ' . $host, 'Date: ' . $date];
  55
  56                 $signed_data = "(request-target): post " . $path . "\nhost: " . $host . "\ndate: " . $date;
  57
  58                 $signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
  59
  60                 $headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",headers="(request-target) host date",signature="' . $signature . '"';
  61                 $headers[] = 'Content-Type: application/activity+json';
  62
  63                 Network::post($target, $content, $headers);
  64                 $return_code = BaseObject::getApp()->get_curl_code();
  65
  66                 echo $return_code."\n";
  67         }
  68
  69         /**
  70          * Return the ActivityPub profile of the given user
  71          *
  72          * @param integer $uid User ID
  73          * @return array
  74          */
  75         public static function profile($uid)
  76         {
  77                 $accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  78
  79                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
  80                         'account_removed' => false, 'verified' => true];
  81                 $fields = ['guid', 'nickname', 'pubkey', 'account-type'];
  82                 $user = DBA::selectFirst('user', $fields, $condition);
  83                 if (!DBA::isResult($user)) {
  84                         return [];
  85                 }
  86
  87                 $fields = ['locality', 'region', 'country-name'];
  88                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
  89                 if (!DBA::isResult($profile)) {
  90                         return [];
  91                 }
  92
  93                 $fields = ['name', 'url', 'location', 'about', 'avatar'];
  94                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
  95                 if (!DBA::isResult($contact)) {
  96                         return [];
  97                 }
  98
  99                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 100                         ['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
 101                         'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
 102
 103                 $data['id'] = $contact['url'];
 104                 $data['uuid'] = $user['guid'];
 105                 $data['type'] = $accounttype[$user['account-type']];
 106                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 107                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 108                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 109                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 110                 $data['preferredUsername'] = $user['nickname'];
 111                 $data['name'] = $contact['name'];
 112                 $data['vcard:hasAddress'] = ['@type' => 'Home', 'vcard:country-name' => $profile['country-name'],
 113                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 114                 $data['summary'] = $contact['about'];
 115                 $data['url'] = $contact['url'];
 116                 $data['manuallyApprovesFollowers'] = false;
 117                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 118                         'owner' => $contact['url'],
 119                         'publicKeyPem' => $user['pubkey']];
 120                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 121                 $data['icon'] = ['type' => 'Image',
 122                         'url' => $contact['avatar']];
 123
 124                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 125                 return $data;
 126         }
 127
 128         public static function createActivityFromItem($item_id)
 129         {
 130                 $item = Item::selectFirst([], ['id' => $item_id]);
 131
 132                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 133                         ['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
 134                         'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
 135                         'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
 136                         'toot' => 'http://joinmastodon.org/ns#']]];
 137
 138                 $data['type'] = 'Create';
 139                 $data['id'] = $item['plink'];
 140                 $data['actor'] = $item['author-link'];
 141                 $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
 142                 $data['object'] = self::createNote($item);
 143                 return $data;
 144         }
 145
 146         public static function createNote($item)
 147         {
 148                 $data = [];
 149                 $data['type'] = 'Note';
 150                 $data['id'] = $item['plink'];
 151                 //$data['context'] = $data['conversation'] = $item['parent-uri'];
 152                 $data['actor'] = $item['author-link'];
 153                 $data['to'] = [];
 154                 if (!$item['private']) {
 155                         $data['to'][] = '"https://pleroma.soykaf.com/users/heluecht"';
 156                 }
 157                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 158                 $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 159                 $data['attributedTo'] = $item['author-link'];
 160                 $data['name'] = BBCode::convert($item['title'], false, 7);
 161                 $data['content'] = BBCode::convert($item['body'], false, 7);
 162                 //$data['summary'] = ''; // Ignore by now
 163                 //$data['sensitive'] = false; // - Query NSFW
 164                 //$data['emoji'] = []; // Ignore by now
 165                 //$data['tag'] = []; /// @ToDo
 166                 //$data['attachment'] = []; // @ToDo
 167                 return $data;
 168         }
 169
 170         public static function transmitActivity($activity, $target, $uid)
 171         {
 172                 $profile = Probe::uri($target, Protocol::ACTIVITYPUB);
 173
 174                 $owner = User::getOwnerDataById($uid);
 175
 176                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 177                         'id' => 'https://pirati.ca/' . strtolower($activity) . '/' . System::createGUID(),
 178                         'type' => $activity,
 179                         'actor' => $owner['url'],
 180                         'object' => $profile['url']];
 181
 182                 return self::transmit($data,  $profile['notify'], $uid);
 183         }
 184
 185         /**
 186          * Fetches ActivityPub content from the given url
 187          *
 188          * @param string $url content url
 189          * @return array
 190          */
 191         public static function fetchContent($url)
 192         {
 193                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json']);
 194
 195                 if (!$ret['success'] || empty($ret['body'])) {
 196                         return;
 197                 }
 198
 199                 return json_decode($ret['body'], true);
 200         }
 201
 202         /**
 203          * Resolves the profile url from the address by using webfinger
 204          *
 205          * @param string $addr profile address (user@domain.tld)
 206          * @return string url
 207          */
 208         private static function addrToUrl($addr)
 209         {
 210                 $addr_parts = explode('@', $addr);
 211                 if (count($addr_parts) != 2) {
 212                         return false;
 213                 }
 214
 215                 $webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
 216
 217                 $ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
 218                 if (!$ret['success'] || empty($ret['body'])) {
 219                         return false;
 220                 }
 221
 222                 $data = json_decode($ret['body'], true);
 223
 224                 if (empty($data['links'])) {
 225                         return false;
 226                 }
 227
 228                 foreach ($data['links'] as $link) {
 229                         if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
 230                                 continue;
 231                         }
 232
 233                         if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
 234                                 return $link['href'];
 235                         }
 236                 }
 237
 238                 return false;
 239         }
 240
 241         public static function verifySignature($content, $http_headers)
 242         {
 243                 $object = json_decode($content, true);
 244
 245                 if (empty($object)) {
 246                         return false;
 247                 }
 248
 249                 $actor = self::processElement($object, 'actor', 'id');
 250
 251                 $headers = [];
 252                 $headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
 253
 254                 // First take every header
 255                 foreach ($http_headers as $k => $v) {
 256                         $field = str_replace('_', '-', strtolower($k));
 257                         $headers[$field] = $v;
 258                 }
 259
 260                 // Now add every http header
 261                 foreach ($http_headers as $k => $v) {
 262                         if (strpos($k, 'HTTP_') === 0) {
 263                                 $field = str_replace('_', '-', strtolower(substr($k, 5)));
 264                                 $headers[$field] = $v;
 265                         }
 266                 }
 267
 268                 $sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
 269
 270                 if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
 271                         return false;
 272                 }
 273
 274                 $signed_data = '';
 275                 foreach ($sig_block['headers'] as $h) {
 276                         if (array_key_exists($h, $headers)) {
 277                                 $signed_data .= $h . ': ' . $headers[$h] . "\n";
 278                         }
 279                 }
 280                 $signed_data = rtrim($signed_data, "\n");
 281
 282                 if (empty($signed_data)) {
 283                         return false;
 284                 }
 285
 286                 $algorithm = null;
 287
 288                 if ($sig_block['algorithm'] === 'rsa-sha256') {
 289                         $algorithm = 'sha256';
 290                 }
 291
 292                 if ($sig_block['algorithm'] === 'rsa-sha512') {
 293                         $algorithm = 'sha512';
 294                 }
 295
 296                 if (empty($algorithm)) {
 297                         return false;
 298                 }
 299
 300                 $key = self::fetchKey($sig_block['keyId'], $actor);
 301
 302                 if (empty($key)) {
 303                         return false;
 304                 }
 305
 306                 if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
 307                         return false;
 308                 }
 309
 310                 // Check the digest if it was part of the signed data
 311                 if (in_array('digest', $sig_block['headers'])) {
 312                         $digest = explode('=', $headers['digest'], 2);
 313                         if ($digest[0] === 'SHA-256') {
 314                                 $hashalg = 'sha256';
 315                         }
 316                         if ($digest[0] === 'SHA-512') {
 317                                 $hashalg = 'sha512';
 318                         }
 319
 320                         /// @todo add all hashes from the rfc
 321
 322                         if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
 323                                 return false;
 324                         }
 325                 }
 326
 327                 // Check the content-length if it was part of the signed data
 328                 if (in_array('content-length', $sig_block['headers'])) {
 329                         if (strlen($content) != $headers['content-length']) {
 330                                 return false;
 331                         }
 332                 }
 333
 334                 return true;
 335
 336         }
 337
 338         private static function fetchKey($id, $actor)
 339         {
 340                 $url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
 341
 342                 $profile = Probe::uri($url, Protocol::ACTIVITYPUB);
 343                 if (!empty($profile)) {
 344                         return $profile['pubkey'];
 345                 } elseif ($url != $actor) {
 346                         $profile = Probe::uri($actor, Protocol::ACTIVITYPUB);
 347                         if (!empty($profile)) {
 348                                 return $profile['pubkey'];
 349                         }
 350                 }
 351
 352                 return false;
 353         }
 354
 355         /**
 356          * @brief
 357          *
 358          * @param string $header
 359          * @return array associate array with
 360          *   - \e string \b keyID
 361          *   - \e string \b algorithm
 362          *   - \e array  \b headers
 363          *   - \e string \b signature
 364          */
 365         private static function parseSigHeader($header)
 366         {
 367                 $ret = [];
 368                 $matches = [];
 369
 370                 if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
 371                         $ret['keyId'] = $matches[1];
 372                 }
 373
 374                 if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
 375                         $ret['algorithm'] = $matches[1];
 376                 }
 377
 378                 if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
 379                         $ret['headers'] = explode(' ', $matches[1]);
 380                 }
 381
 382                 if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
 383                         $ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
 384                 }
 385
 386                 return $ret;
 387         }
 388
 389         /**
 390          * Fetches a profile from the given url
 391          *
 392          * @param string $url profile url
 393          * @return array
 394          */
 395         public static function fetchProfile($url)
 396         {
 397                 if (empty(parse_url($url, PHP_URL_SCHEME))) {
 398                         $url = self::addrToUrl($url);
 399                         if (empty($url)) {
 400                                 return false;
 401                         }
 402                 }
 403
 404                 $data = self::fetchContent($url);
 405
 406                 if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
 407                         return false;
 408                 }
 409
 410                 $profile = ['network' => Protocol::ACTIVITYPUB];
 411                 $profile['nick'] = $data['preferredUsername'];
 412                 $profile['name'] = defaults($data, 'name', $profile['nick']);
 413                 $profile['guid'] = defaults($data, 'uuid', null);
 414                 $profile['url'] = $data['id'];
 415
 416                 $parts = parse_url($profile['url']);
 417                 unset($parts['scheme']);
 418                 unset($parts['path']);
 419                 $profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 420                 $profile['alias'] = self::processElement($data, 'url', 'href');
 421                 $profile['photo'] = self::processElement($data, 'icon', 'url');
 422                 // $profile['community']
 423                 // $profile['keywords']
 424                 // $profile['location']
 425                 $profile['about'] = defaults($data, 'summary', '');
 426                 $profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
 427                 $profile['notify'] = $data['inbox'];
 428                 $profile['poll'] = $data['outbox'];
 429                 $profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
 430
 431                 // Check if the address is resolvable
 432                 if (self::addrToUrl($profile['addr']) == $profile['url']) {
 433                         $parts = parse_url($profile['url']);
 434                         unset($parts['path']);
 435                         $profile['baseurl'] = Network::unparseURL($parts);
 436                 } else {
 437                         unset($profile['addr']);
 438                 }
 439
 440                 if ($profile['url'] == $profile['alias']) {
 441                         unset($profile['alias']);
 442                 }
 443
 444                 // Remove all "null" fields
 445                 foreach ($profile as $field => $content) {
 446                         if (is_null($content)) {
 447                                 unset($profile[$field]);
 448                         }
 449                 }
 450
 451 /*
 452                 // To-Do
 453                 unset($data['type']);
 454                 unset($data['manuallyApprovesFollowers']);
 455
 456                 // Unhandled
 457                 unset($data['@context']);
 458                 unset($data['tag']);
 459                 unset($data['attachment']);
 460                 unset($data['image']);
 461                 unset($data['nomadicLocations']);
 462                 unset($data['signature']);
 463                 unset($data['following']);
 464                 unset($data['followers']);
 465                 unset($data['featured']);
 466                 unset($data['movedTo']);
 467                 unset($data['liked']);
 468                 unset($data['sharedInbox']); // Misskey
 469                 unset($data['isCat']); // Misskey
 470                 unset($data['kroeg:blocks']); // Kroeg
 471                 unset($data['updated']); // Kroeg
 472 */
 473                 return $profile;
 474         }
 475
 476         public static function processInbox($body, $header)
 477         {
 478                 logger('Incoming message', LOGGER_DEBUG);
 479
 480                 if (!self::verifySignature($body, $header)) {
 481                         logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
 482                         return;
 483                 }
 484
 485                 $activity = json_decode($body, true);
 486
 487                 if (!is_array($activity)) {
 488                         logger('Invalid body.', LOGGER_DEBUG);
 489                         return;
 490                 }
 491
 492                 self::processActivity($activity, $body);
 493         }
 494
 495         public static function fetchOutbox($url)
 496         {
 497                 $data = self::fetchContent($url);
 498                 if (empty($data)) {
 499                         return;
 500                 }
 501
 502                 if (!empty($data['orderedItems'])) {
 503                         $items = $data['orderedItems'];
 504                 } elseif (!empty($data['first']['orderedItems'])) {
 505                         $items = $data['first']['orderedItems'];
 506                 } elseif (!empty($data['first'])) {
 507                         self::fetchOutbox($data['first']);
 508                         return;
 509                 } else {
 510                         $items = [];
 511                 }
 512
 513                 foreach ($items as $activity) {
 514                         self::processActivity($activity);
 515                 }
 516         }
 517
 518         function processActivity($activity, $body = '')
 519         {
 520                 if (empty($activity['type'])) {
 521                         logger('Empty type', LOGGER_DEBUG);
 522                         return;
 523                 }
 524
 525                 if (empty($activity['object'])) {
 526                         logger('Empty object', LOGGER_DEBUG);
 527                         return;
 528                 }
 529
 530                 if (empty($activity['actor'])) {
 531                         logger('Empty actor', LOGGER_DEBUG);
 532                         return;
 533
 534                 }
 535
 536                 $actor = self::processElement($activity, 'actor', 'id');
 537                 if (empty($actor)) {
 538                         logger('Empty actor - 2', LOGGER_DEBUG);
 539                         return;
 540                 }
 541
 542                 if (is_string($activity['object'])) {
 543                         $object_url = $activity['object'];
 544                 } elseif (!empty($activity['object']['id'])) {
 545                         $object_url = $activity['object']['id'];
 546                 } else {
 547                         logger('No object found', LOGGER_DEBUG);
 548                         return;
 549                 }
 550
 551                 $receivers = self::getReceivers($activity);
 552                 if (empty($receivers)) {
 553                         logger('No receivers found', LOGGER_DEBUG);
 554                         return;
 555                 }
 556
 557                 // ----------------------------------
 558 /*
 559                 // unhandled
 560                 unset($activity['@context']);
 561                 unset($activity['id']);
 562
 563                 // Non standard
 564                 unset($activity['title']);
 565                 unset($activity['atomUri']);
 566                 unset($activity['context_id']);
 567                 unset($activity['statusnetConversationId']);
 568
 569                 // To-Do?
 570                 unset($activity['context']);
 571                 unset($activity['location']);
 572                 unset($activity['signature']);
 573 */
 574
 575                 if (!in_array($activity['type'], ['Like', 'Dislike'])) {
 576                         $item = self::fetchObject($object_url, $activity['object']);
 577                         if (empty($item)) {
 578                                 logger("Object data couldn't be processed", LOGGER_DEBUG);
 579                                 return;
 580                         }
 581                 } else {
 582                         $item['object'] = $object_url;
 583                         $item['receiver'] = [];
 584                         $item['type'] = $activity['type'];
 585                 }
 586
 587                 $item = self::addActivityFields($item, $activity);
 588
 589                 $item['owner'] = $actor;
 590
 591                 $item['receiver'] = array_merge($item['receiver'], $receivers);
 592
 593                 logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
 594
 595                 switch ($activity['type']) {
 596                         case 'Create':
 597                         case 'Update':
 598                         case 'Announce':
 599                                 self::createItem($item, $body);
 600                                 break;
 601
 602                         case 'Like':
 603                         case 'Dislike':
 604                                 self::activityItem($item, $body);
 605                                 break;
 606
 607                         case 'Follow':
 608                                 break;
 609
 610                         default:
 611                                 logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
 612                                 break;
 613                 }
 614         }
 615
 616         private static function getReceivers($activity)
 617         {
 618                 $receivers = [];
 619
 620                 $elements = ['to', 'cc', 'bto', 'bcc'];
 621                 foreach ($elements as $element) {
 622                         if (empty($activity[$element])) {
 623                                 continue;
 624                         }
 625
 626                         // The receiver can be an arror or a string
 627                         if (is_string($activity[$element])) {
 628                                 $activity[$element] = [$activity[$element]];
 629                         }
 630
 631                         foreach ($activity[$element] as $receiver) {
 632                                 if ($receiver == self::PUBLIC) {
 633                                         $receivers[$receiver] = 0;
 634                                 }
 635
 636                                 $condition = ['self' => true, 'nurl' => normalise_link($receiver)];
 637                                 $contact = DBA::selectFirst('contact', ['uid'], $condition);
 638                                 if (!DBA::isResult($contact)) {
 639                                         continue;
 640                                 }
 641                                 $receivers[$receiver] = $contact['uid'];
 642                         }
 643                 }
 644                 return $receivers;
 645         }
 646
 647         private static function addActivityFields($item, $activity)
 648         {
 649                 if (!empty($activity['published']) && empty($item['published'])) {
 650                         $item['published'] = $activity['published'];
 651                 }
 652
 653                 if (!empty($activity['updated']) && empty($item['updated'])) {
 654                         $item['updated'] = $activity['updated'];
 655                 }
 656
 657                 if (!empty($activity['inReplyTo']) && empty($item['parent-uri'])) {
 658                         $item['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
 659                 }
 660
 661                 if (!empty($activity['instrument'])) {
 662                         $item['service'] = self::processElement($activity, 'instrument', 'name', 'Service');
 663                 }
 664                 return $item;
 665         }
 666
 667         private static function fetchObject($object_url, $object = [])
 668         {
 669                 $data = self::fetchContent($object_url);
 670                 if (empty($data)) {
 671                         $data = $object;
 672                         if (empty($data)) {
 673                                 logger('Empty content');
 674                                 return false;
 675                         } else {
 676                                 logger('Using provided object');
 677                         }
 678                 }
 679
 680                 if (empty($data['type'])) {
 681                         logger('Empty type');
 682                         return false;
 683                 } else {
 684                         $type = $data['type'];
 685                         logger('Type ' . $type);
 686                 }
 687
 688                 if (in_array($type, ['Note', 'Article', 'Video'])) {
 689                         $common = self::processCommonData($data);
 690                 }
 691
 692                 switch ($type) {
 693                         case 'Note':
 694                                 return array_merge($common, self::processNote($data));
 695                         case 'Article':
 696                                 return array_merge($common, self::processArticle($data));
 697                         case 'Video':
 698                                 return array_merge($common, self::processVideo($data));
 699
 700                         case 'Announce':
 701                                 if (empty($data['object'])) {
 702                                         return false;
 703                                 }
 704                                 return self::fetchObject($data['object']);
 705
 706                         case 'Person':
 707                         case 'Tombstone':
 708                                 break;
 709
 710                         default:
 711                                 logger('Unknown object type: ' . $data['type'], LOGGER_DEBUG);
 712                                 break;
 713                 }
 714         }
 715
 716         private static function processCommonData(&$object)
 717         {
 718                 if (empty($object['id']) || empty($object['attributedTo'])) {
 719                         return false;
 720                 }
 721
 722                 $item = [];
 723                 $item['type'] = $object['type'];
 724                 $item['uri'] = $object['id'];
 725
 726                 if (!empty($object['inReplyTo'])) {
 727                         $item['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
 728                 } else {
 729                         $item['reply-to-uri'] = $item['uri'];
 730                 }
 731
 732                 $item['published'] = defaults($object, 'published', null);
 733                 $item['updated'] = defaults($object, 'updated', $item['published']);
 734
 735                 if (empty($item['published']) && !empty($item['updated'])) {
 736                         $item['published'] = $item['updated'];
 737                 }
 738
 739                 $item['uuid'] = defaults($object, 'uuid', null);
 740                 $item['owner'] = $item['author'] = self::processElement($object, 'attributedTo', 'id');
 741                 $item['context'] = defaults($object, 'context', null);
 742                 $item['conversation'] = defaults($object, 'conversation', null);
 743                 $item['sensitive'] = defaults($object, 'sensitive', null);
 744                 $item['name'] = defaults($object, 'title', null);
 745                 $item['name'] = defaults($object, 'name', $item['name']);
 746                 $item['summary'] = defaults($object, 'summary', null);
 747                 $item['content'] = defaults($object, 'content', null);
 748                 $item['location'] = self::processElement($object, 'location', 'name', 'Place');
 749                 $item['attachments'] = defaults($object, 'attachment', null);
 750                 $item['tags'] = defaults($object, 'tag', null);
 751                 $item['service'] = self::processElement($object, 'instrument', 'name', 'Service');
 752                 $item['alternate-url'] = self::processElement($object, 'url', 'href');
 753                 $item['receiver'] = self::getReceivers($object);
 754
 755 /*
 756                 // To-Do
 757                 unset($object['source']);
 758
 759                 // Unhandled
 760                 unset($object['@context']);
 761                 unset($object['type']);
 762                 unset($object['actor']);
 763                 unset($object['signature']);
 764                 unset($object['mediaType']);
 765                 unset($object['duration']);
 766                 unset($object['replies']);
 767                 unset($object['icon']);
 768
 769                 // Also missing:
 770                 audience, preview, endTime, startTime, generator, image
 771 */
 772                 return $item;
 773         }
 774
 775         private static function processNote($object)
 776         {
 777                 $item = [];
 778
 779 /*
 780                 // To-Do?
 781                 unset($object['emoji']);
 782                 unset($object['atomUri']);
 783                 unset($object['inReplyToAtomUri']);
 784
 785                 // Unhandled
 786                 unset($object['contentMap']);
 787                 unset($object['announcement_count']);
 788                 unset($object['announcements']);
 789                 unset($object['context_id']);
 790                 unset($object['likes']);
 791                 unset($object['like_count']);
 792                 unset($object['inReplyToStatusId']);
 793                 unset($object['shares']);
 794                 unset($object['quoteUrl']);
 795                 unset($object['statusnetConversationId']);
 796 */
 797                 return $item;
 798         }
 799
 800         private static function processArticle($object)
 801         {
 802                 $item = [];
 803
 804                 return $item;
 805         }
 806
 807         private static function processVideo($object)
 808         {
 809                 $item = [];
 810 /*
 811                 // To-Do?
 812                 unset($object['category']);
 813                 unset($object['licence']);
 814                 unset($object['language']);
 815                 unset($object['commentsEnabled']);
 816
 817                 // Unhandled
 818                 unset($object['views']);
 819                 unset($object['waitTranscoding']);
 820                 unset($object['state']);
 821                 unset($object['support']);
 822                 unset($object['subtitleLanguage']);
 823                 unset($object['likes']);
 824                 unset($object['dislikes']);
 825                 unset($object['shares']);
 826                 unset($object['comments']);
 827 */
 828                 return $item;
 829         }
 830
 831         private static function processElement($array, $element, $key, $type = null)
 832         {
 833                 if (empty($array)) {
 834                         return false;
 835                 }
 836
 837                 if (empty($array[$element])) {
 838                         return false;
 839                 }
 840
 841                 if (is_string($array[$element])) {
 842                         return $array[$element];
 843                 }
 844
 845                 if (is_null($type)) {
 846                         if (!empty($array[$element][$key])) {
 847                                 return $array[$element][$key];
 848                         }
 849
 850                         if (!empty($array[$element][0][$key])) {
 851                                 return $array[$element][0][$key];
 852                         }
 853
 854                         return false;
 855                 }
 856
 857                 if (!empty($array[$element][$key]) && !empty($array[$element]['type']) && ($array[$element]['type'] == $type)) {
 858                         return $array[$element][$key];
 859                 }
 860
 861                 /// @todo Add array search
 862
 863                 return false;
 864         }
 865
 866         private static function convertMentions($body)
 867         {
 868                 $URLSearchString = "^\[\]";
 869                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
 870
 871                 return $body;
 872         }
 873
 874         private static function constructTagList($tags, $sensitive)
 875         {
 876                 if (empty($tags)) {
 877                         return '';
 878                 }
 879
 880                 $tag_text = '';
 881                 foreach ($tags as $tag) {
 882                         if (in_array($tag['type'], ['Mention', 'Hashtag'])) {
 883                                 if (!empty($tag_text)) {
 884                                         $tag_text .= ',';
 885                                 }
 886
 887                                 $tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
 888                         }
 889                 }
 890
 891                 /// @todo add nsfw for $sensitive
 892
 893                 return $tag_text;
 894         }
 895
 896         private static function constructAttachList($attachments, $item)
 897         {
 898                 if (empty($attachments)) {
 899                         return $item;
 900                 }
 901
 902                 foreach ($attachments as $attach) {
 903                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 904                         if ($filetype == 'image') {
 905                                 $item['body'] .= "\n[img]".$attach['url'].'[/img]';
 906                         } else {
 907                                 if (!empty($item["attach"])) {
 908                                         $item["attach"] .= ',';
 909                                 } else {
 910                                         $item["attach"] = '';
 911                                 }
 912                                 if (!isset($attach['length'])) {
 913                                         $attach['length'] = "0";
 914                                 }
 915                                 $item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
 916                         }
 917                 }
 918
 919                 return $item;
 920         }
 921
 922         private static function createItem($activity, $body)
 923         {
 924                 /// @todo What to do with $activity['context']?
 925
 926                 $item = [];
 927                 $item['network'] = Protocol::ACTIVITYPUB;
 928                 $item['private'] = !in_array(0, $activity['receiver']);
 929                 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
 930                 $item['owner-id'] = Contact::getIdForURL($activity['owner'], 0, true);
 931                 $item['uri'] = $activity['uri'];
 932                 $item['parent-uri'] = $activity['reply-to-uri'];
 933                 $item['verb'] = ACTIVITY_POST;
 934                 $item['object-type'] = ACTIVITY_OBJ_NOTE; /// Todo?
 935                 $item['created'] = $activity['published'];
 936                 $item['edited'] = $activity['updated'];
 937                 $item['guid'] = $activity['uuid'];
 938                 $item['title'] = HTML::toBBCode($activity['name']);
 939                 $item['content-warning'] = HTML::toBBCode($activity['summary']);
 940                 $item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
 941                 $item['location'] = $activity['location'];
 942                 $item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
 943                 $item['app'] = $activity['service'];
 944                 $item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
 945
 946                 $item = self::constructAttachList($activity['attachments'], $item);
 947
 948                 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 949                 $item['source'] = $body;
 950                 $item['conversation-uri'] = $activity['conversation'];
 951
 952                 foreach ($activity['receiver'] as $receiver) {
 953                         $item['uid'] = $receiver;
 954                         $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
 955
 956                         if (($receiver != 0) && empty($item['contact-id'])) {
 957                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
 958                         }
 959
 960                         $item_id = Item::insert($item);
 961                         logger('Storing for user ' . $item['uid'] . ': ' . $item_id);
 962                         if (!empty($item_id) && ($item['uid'] == 0)) {
 963                                 Item::distribute($item_id);
 964                         }
 965                 }
 966         }
 967
 968         private static function activityItem($data)
 969         {
 970                 logger('Activity "' . $data['type'] . '" for ' . $data['object']);
 971                 $items = Item::select(['id'], ['uri' => $data['object']]);
 972                 while ($item = Item::fetch($items)) {
 973                         logger('Activity ' . $data['type'] . ' for item ' . $item['id'], LOGGER_DEBUG);
 974                         Item::performLike($item['id'], strtolower($data['type']));
 975                 }
 976                 DBA::close($item);
 977                 logger('Activity done');
 978         }
 979
 980 }