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\Item;
  14 use Friendica\Model\User;
  15 use Friendica\Util\DateTimeFormat;
  16 use Friendica\Util\Crypto;
  17 use Friendica\Content\Text\BBCode;
  18 use Friendica\Network\Probe;
  19
  20 /**
  21  * @brief ActivityPub Protocol class
  22  * The ActivityPub Protocol is a message exchange protocol defined by the W3C.
  23  * https://www.w3.org/TR/activitypub/
  24  * https://www.w3.org/TR/activitystreams-core/
  25  * https://www.w3.org/TR/activitystreams-vocabulary/
  26  *
  27  * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
  28  * https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
  29  *
  30  * Digest: https://tools.ietf.org/html/rfc5843
  31  * https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
  32  */
  33 class ActivityPub
  34 {
  35         const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
  36
  37         public static function transmit($content, $target, $uid)
  38         {
  39                 $owner = User::getOwnerDataById($uid);
  40
  41                 if (!$owner) {
  42                         return;
  43                 }
  44
  45                 $host = parse_url($target, PHP_URL_HOST);
  46                 $path = parse_url($target, PHP_URL_PATH);
  47                 $date = date('r');
  48
  49                 $headers = ['Host: ' . $host, 'Date: ' . $date];
  50
  51                 $signed_data = "(request-target): post " . $path . "\nhost: " . $host . "\ndate: " . $date;
  52
  53                 $signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
  54
  55                 $headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",headers="(request-target) host date",signature="' . $signature . '"';
  56                 $headers[] = 'Content-Type: application/activity+json';
  57
  58                 Network::post($target, $content, $headers);
  59                 $return_code = BaseObject::getApp()->get_curl_code();
  60
  61                 echo $return_code."\n";
  62         }
  63
  64         /**
  65          * Return the ActivityPub profile of the given user
  66          *
  67          * @param integer $uid User ID
  68          * @return array
  69          */
  70         public static function profile($uid)
  71         {
  72                 $accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application'];
  73
  74                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
  75                         'account_removed' => false, 'verified' => true];
  76                 $fields = ['guid', 'nickname', 'pubkey', 'account-type'];
  77                 $user = DBA::selectFirst('user', $fields, $condition);
  78                 if (!DBA::isResult($user)) {
  79                         return [];
  80                 }
  81
  82                 $fields = ['locality', 'region', 'country-name'];
  83                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
  84                 if (!DBA::isResult($profile)) {
  85                         return [];
  86                 }
  87
  88                 $fields = ['name', 'url', 'location', 'about', 'avatar'];
  89                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
  90                 if (!DBA::isResult($contact)) {
  91                         return [];
  92                 }
  93
  94                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
  95                         ['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
  96                         'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
  97
  98                 $data['id'] = $contact['url'];
  99                 $data['uuid'] = $user['guid'];
 100                 $data['type'] = $accounttype[$user['account-type']];
 101                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 102                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 103                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 104                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 105                 $data['preferredUsername'] = $user['nickname'];
 106                 $data['name'] = $contact['name'];
 107                 $data['vcard:hasAddress'] = ['@type' => 'Home', 'vcard:country-name' => $profile['country-name'],
 108                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 109                 $data['summary'] = $contact['about'];
 110                 $data['url'] = $contact['url'];
 111                 $data['manuallyApprovesFollowers'] = false;
 112                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 113                         'owner' => $contact['url'],
 114                         'publicKeyPem' => $user['pubkey']];
 115                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 116                 $data['icon'] = ['type' => 'Image',
 117                         'url' => $contact['avatar']];
 118
 119                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 120                 return $data;
 121         }
 122
 123         public static function createActivityFromItem($item_id)
 124         {
 125                 $item = Item::selectFirst([], ['id' => $item_id]);
 126
 127                 $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
 128                         ['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
 129                         'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
 130                         'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
 131                         'toot' => 'http://joinmastodon.org/ns#']]];
 132
 133                 $data['type'] = 'Create';
 134                 $data['id'] = $item['plink'];
 135                 $data['actor'] = $item['author-link'];
 136                 $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
 137                 $data['object'] = self::createNote($item);
 138 //              print_r($data);
 139 //              print_r($item);
 140                 return $data;
 141         }
 142
 143         public static function createNote($item)
 144         {
 145                 $data = [];
 146                 $data['type'] = 'Note';
 147                 $data['id'] = $item['plink'];
 148                 //$data['context'] = $data['conversation'] = $item['parent-uri'];
 149                 $data['actor'] = $item['author-link'];
 150 //              if (!$item['private']) {
 151 //                      $data['to'] = [];
 152 //                      $data['to'][] = '"https://pleroma.soykaf.com/users/heluecht"';
 153                         $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
 154 //                      $data['cc'] = 'https://pleroma.soykaf.com/users/heluecht';
 155 //              }
 156                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 157                 $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 158                 $data['attributedTo'] = $item['author-link'];
 159                 $data['name'] = BBCode::convert($item['title'], false, 7);
 160                 $data['content'] = BBCode::convert($item['body'], false, 7);
 161                 //$data['summary'] = '';
 162                 //$data['sensitive'] = false;
 163                 //$data['emoji'] = [];
 164                 //$data['tag'] = [];
 165                 //$data['attachment'] = [];
 166                 return $data;
 167         }
 168
 169         /**
 170          * Fetches ActivityPub content from the given url
 171          *
 172          * @param string $url content url
 173          * @return array
 174          */
 175         public static function fetchContent($url)
 176         {
 177                 $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json']);
 178
 179                 if (!$ret['success'] || empty($ret['body'])) {
 180                         return;
 181                 }
 182
 183                 return json_decode($ret['body'], true);
 184         }
 185
 186         /**
 187          * Resolves the profile url from the address by using webfinger
 188          *
 189          * @param string $addr profile address (user@domain.tld)
 190          * @return string url
 191          */
 192         private static function addrToUrl($addr)
 193         {
 194                 $addr_parts = explode('@', $addr);
 195                 if (count($addr_parts) != 2) {
 196                         return false;
 197                 }
 198
 199                 $webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
 200
 201                 $ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
 202                 if (!$ret['success'] || empty($ret['body'])) {
 203                         return false;
 204                 }
 205
 206                 $data = json_decode($ret['body'], true);
 207
 208                 if (empty($data['links'])) {
 209                         return false;
 210                 }
 211
 212                 foreach ($data['links'] as $link) {
 213                         if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
 214                                 continue;
 215                         }
 216
 217                         if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
 218                                 return $link['href'];
 219                         }
 220                 }
 221
 222                 return false;
 223         }
 224
 225         public static function verifySignature($content, $http_headers)
 226         {
 227                 $object = json_decode($content, true);
 228
 229                 if (empty($object)) {
 230                         return false;
 231                 }
 232
 233                 $actor = self::processElement($object, 'actor', 'id');
 234
 235                 $headers = [];
 236                 $headers['(request-target)'] = strtolower($http_headers['REQUEST_METHOD']) . ' ' . $http_headers['REQUEST_URI'];
 237
 238                 // First take every header
 239                 foreach ($http_headers as $k => $v) {
 240                         $field = str_replace('_', '-', strtolower($k));
 241                         $headers[$field] = $v;
 242                 }
 243
 244                 // Now add every http header
 245                 foreach ($http_headers as $k => $v) {
 246                         if (strpos($k, 'HTTP_') === 0) {
 247                                 $field = str_replace('_', '-', strtolower(substr($k, 5)));
 248                                 $headers[$field] = $v;
 249                         }
 250                 }
 251
 252                 $sig_block = ActivityPub::parseSigHeader($http_headers['HTTP_SIGNATURE']);
 253
 254                 if (empty($sig_block) || empty($sig_block['headers']) || empty($sig_block['keyId'])) {
 255                         return false;
 256                 }
 257
 258                 $signed_data = '';
 259                 foreach ($sig_block['headers'] as $h) {
 260                         if (array_key_exists($h, $headers)) {
 261                                 $signed_data .= $h . ': ' . $headers[$h] . "\n";
 262                         }
 263                 }
 264                 $signed_data = rtrim($signed_data, "\n");
 265
 266                 if (empty($signed_data)) {
 267                         return false;
 268                 }
 269
 270                 $algorithm = null;
 271
 272                 if ($sig_block['algorithm'] === 'rsa-sha256') {
 273                         $algorithm = 'sha256';
 274                 }
 275
 276                 if ($sig_block['algorithm'] === 'rsa-sha512') {
 277                         $algorithm = 'sha512';
 278                 }
 279
 280                 if (empty($algorithm)) {
 281                         return false;
 282                 }
 283
 284                 $key = self::fetchKey($sig_block['keyId'], $actor);
 285
 286                 if (empty($key)) {
 287                         return false;
 288                 }
 289
 290                 if (!Crypto::rsaVerify($signed_data, $sig_block['signature'], $key, $algorithm)) {
 291                         return false;
 292                 }
 293
 294                 // Check the digest if it was part of the signed data
 295                 if (in_array('digest', $sig_block['headers'])) {
 296                         $digest = explode('=', $headers['digest'], 2);
 297                         if ($digest[0] === 'SHA-256') {
 298                                 $hashalg = 'sha256';
 299                         }
 300                         if ($digest[0] === 'SHA-512') {
 301                                 $hashalg = 'sha512';
 302                         }
 303
 304                         /// @todo addd all hashes from the rfc
 305
 306                         if (!empty($hashalg) && base64_encode(hash($hashalg, $content, true)) != $digest[1]) {
 307                                 return false;
 308                         }
 309                 }
 310
 311                 // Check the content-length if it was part of the signed data
 312                 if (in_array('content-length', $sig_block['headers'])) {
 313                         if (strlen($content) != $headers['content-length']) {
 314                                 return false;
 315                         }
 316                 }
 317
 318                 return true;
 319
 320         }
 321
 322         private static function fetchKey($id, $actor)
 323         {
 324                 $url = (strpos($id, '#') ? substr($id, 0, strpos($id, '#')) : $id);
 325
 326                 $profile = Probe::uri($url, Protocol::ACTIVITYPUB);
 327                 if (!empty($profile)) {
 328                         return $profile['pubkey'];
 329                 } elseif ($url != $actor) {
 330                         $profile = Probe::uri($actor, Protocol::ACTIVITYPUB);
 331                         if (!empty($profile)) {
 332                                 return $profile['pubkey'];
 333                         }
 334                 }
 335
 336                 return false;
 337         }
 338
 339         /**
 340          * @brief
 341          *
 342          * @param string $header
 343          * @return array associate array with
 344          *   - \e string \b keyID
 345          *   - \e string \b algorithm
 346          *   - \e array  \b headers
 347          *   - \e string \b signature
 348          */
 349         private static function parseSigHeader($header)
 350         {
 351                 $ret = [];
 352                 $matches = [];
 353
 354                 if (preg_match('/keyId="(.*?)"/ism',$header,$matches)) {
 355                         $ret['keyId'] = $matches[1];
 356                 }
 357
 358                 if (preg_match('/algorithm="(.*?)"/ism',$header,$matches)) {
 359                         $ret['algorithm'] = $matches[1];
 360                 }
 361
 362                 if (preg_match('/headers="(.*?)"/ism',$header,$matches)) {
 363                         $ret['headers'] = explode(' ', $matches[1]);
 364                 }
 365
 366                 if (preg_match('/signature="(.*?)"/ism',$header,$matches)) {
 367                         $ret['signature'] = base64_decode(preg_replace('/\s+/','',$matches[1]));
 368                 }
 369
 370                 return $ret;
 371         }
 372
 373         /**
 374          * Fetches a profile from the given url
 375          *
 376          * @param string $url profile url
 377          * @return array
 378          */
 379         public static function fetchProfile($url)
 380         {
 381                 if (empty(parse_url($url, PHP_URL_SCHEME))) {
 382                         $url = self::addrToUrl($url);
 383                         if (empty($url)) {
 384                                 return false;
 385                         }
 386                 }
 387
 388                 $data = self::fetchContent($url);
 389
 390                 if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
 391                         return false;
 392                 }
 393
 394                 $profile = ['network' => Protocol::ACTIVITYPUB];
 395                 $profile['nick'] = $data['preferredUsername'];
 396                 $profile['name'] = defaults($data, 'name', $profile['nick']);
 397                 $profile['guid'] = defaults($data, 'uuid', null);
 398                 $profile['url'] = $data['id'];
 399
 400                 $parts = parse_url($profile['url']);
 401                 unset($parts['scheme']);
 402                 unset($parts['path']);
 403                 $profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 404                 $profile['alias'] = self::processElement($data, 'url', 'href');
 405                 $profile['photo'] = self::processElement($data, 'icon', 'url');
 406                 // $profile['community']
 407                 // $profile['keywords']
 408                 // $profile['location']
 409                 $profile['about'] = defaults($data, 'summary', '');
 410                 $profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
 411                 $profile['notify'] = $data['inbox'];
 412                 $profile['poll'] = $data['outbox'];
 413                 $profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
 414
 415                 // Check if the address is resolvable
 416                 if (self::addrToUrl($profile['addr']) == $profile['url']) {
 417                         $parts = parse_url($profile['url']);
 418                         unset($parts['path']);
 419                         $profile['baseurl'] = Network::unparseURL($parts);
 420                 } else {
 421                         unset($profile['addr']);
 422                 }
 423
 424                 if ($profile['url'] == $profile['alias']) {
 425                         unset($profile['alias']);
 426                 }
 427
 428                 // Remove all "null" fields
 429                 foreach ($profile as $field => $content) {
 430                         if (is_null($content)) {
 431                                 unset($profile[$field]);
 432                         }
 433                 }
 434
 435                 // Handled
 436                 unset($data['id']);
 437                 unset($data['inbox']);
 438                 unset($data['outbox']);
 439                 unset($data['preferredUsername']);
 440                 unset($data['name']);
 441                 unset($data['summary']);
 442                 unset($data['url']);
 443                 unset($data['publicKey']);
 444                 unset($data['endpoints']);
 445                 unset($data['icon']);
 446                 unset($data['uuid']);
 447
 448                 // To-Do
 449                 unset($data['type']);
 450                 unset($data['manuallyApprovesFollowers']);
 451
 452                 // Unhandled
 453                 unset($data['@context']);
 454                 unset($data['tag']);
 455                 unset($data['attachment']);
 456                 unset($data['image']);
 457                 unset($data['nomadicLocations']);
 458                 unset($data['signature']);
 459                 unset($data['following']);
 460                 unset($data['followers']);
 461                 unset($data['featured']);
 462                 unset($data['movedTo']);
 463                 unset($data['liked']);
 464                 unset($data['sharedInbox']); // Misskey
 465                 unset($data['isCat']); // Misskey
 466                 unset($data['kroeg:blocks']); // Kroeg
 467                 unset($data['updated']); // Kroeg
 468
 469 /*              if (!empty($data)) {
 470                         print_r($data);
 471                         die();
 472                 }
 473 */
 474                 return $profile;
 475         }
 476
 477         public static function fetchOutbox($url)
 478         {
 479                 $data = self::fetchContent($url);
 480                 if (empty($data)) {
 481                         return;
 482                 }
 483
 484                 if (!empty($data['orderedItems'])) {
 485                         $items = $data['orderedItems'];
 486                 } elseif (!empty($data['first']['orderedItems'])) {
 487                         $items = $data['first']['orderedItems'];
 488                 } elseif (!empty($data['first'])) {
 489                         self::fetchOutbox($data['first']);
 490                         return;
 491                 } else {
 492                         $items = [];
 493                 }
 494
 495                 foreach ($items as $activity) {
 496                         self::processActivity($activity, $url);
 497                 }
 498         }
 499
 500         function processActivity($activity, $url)
 501         {
 502                 if (empty($activity['type'])) {
 503                         return;
 504                 }
 505
 506                 if (empty($activity['object'])) {
 507                         return;
 508                 }
 509
 510                 if (empty($activity['actor'])) {
 511                         return;
 512                 }
 513
 514                 $actor = self::processElement($activity, 'actor', 'id');
 515                 if (empty($actor)) {
 516                         return;
 517                 }
 518
 519                 if (is_string($activity['object'])) {
 520                         $object_url = $activity['object'];
 521                 } elseif (!empty($activity['object']['id'])) {
 522                         $object_url = $activity['object']['id'];
 523                 } else {
 524                         return;
 525                 }
 526
 527                 $receivers = self::getReceivers($activity);
 528                 if (empty($receivers)) {
 529                         return;
 530                 }
 531
 532                 // ----------------------------------
 533                 // unhandled
 534                 unset($activity['@context']);
 535                 unset($activity['id']);
 536
 537                 // Non standard
 538                 unset($activity['title']);
 539                 unset($activity['atomUri']);
 540                 unset($activity['context_id']);
 541                 unset($activity['statusnetConversationId']);
 542
 543                 $structure = $activity;
 544
 545                 // To-Do?
 546                 unset($activity['context']);
 547                 unset($activity['location']);
 548
 549                 // handled
 550                 unset($activity['to']);
 551                 unset($activity['cc']);
 552                 unset($activity['bto']);
 553                 unset($activity['bcc']);
 554                 unset($activity['type']);
 555                 unset($activity['actor']);
 556                 unset($activity['object']);
 557                 unset($activity['published']);
 558                 unset($activity['updated']);
 559                 unset($activity['instrument']);
 560                 unset($activity['inReplyTo']);
 561
 562                 if (!empty($activity)) {
 563                         echo "Activity\n";
 564                         print_r($activity);
 565                         die($url."\n");
 566                 }
 567
 568                 $activity = $structure;
 569                 // ----------------------------------
 570
 571                 $item = self::fetchObject($object_url, $url);
 572                 if (empty($item)) {
 573                         return;
 574                 }
 575
 576                 $item = self::addActivityFields($item, $activity);
 577
 578                 $item['owner'] = $actor;
 579
 580                 $item['receiver'] = array_merge($item['receiver'], $receivers);
 581
 582                 switch ($activity['type']) {
 583                         case 'Create':
 584                         case 'Update':
 585                                 self::createItem($item);
 586                                 break;
 587
 588                         case 'Announce':
 589                                 self::announceItem($item);
 590                                 break;
 591
 592                         case 'Like':
 593                         case 'Dislike':
 594                                 self::activityItem($item);
 595                                 break;
 596
 597                         case 'Follow':
 598                                 break;
 599
 600                         default:
 601                                 echo "Unknown activity: ".$activity['type']."\n";
 602                                 print_r($item);
 603                                 die();
 604                                 break;
 605                 }
 606         }
 607
 608         private static function getReceivers($activity)
 609         {
 610                 $receivers = [];
 611
 612                 $elements = ['to', 'cc', 'bto', 'bcc'];
 613                 foreach ($elements as $element) {
 614                         if (empty($activity[$element])) {
 615                                 continue;
 616                         }
 617
 618                         // The receiver can be an arror or a string
 619                         if (is_string($activity[$element])) {
 620                                 $activity[$element] = [$activity[$element]];
 621                         }
 622
 623                         foreach ($activity[$element] as $receiver) {
 624                                 if ($receiver == self::PUBLIC) {
 625                                         $receivers[$receiver] = 0;
 626                                 }
 627
 628                                 $condition = ['self' => true, 'nurl' => normalise_link($receiver)];
 629                                 $contact = DBA::selectFirst('contact', ['id'], $condition);
 630                                 if (!DBA::isResult($contact)) {
 631                                         continue;
 632                                 }
 633                                 $receivers[$receiver] = $contact['id'];
 634                         }
 635                 }
 636                 return $receivers;
 637         }
 638
 639         private static function addActivityFields($item, $activity)
 640         {
 641                 if (!empty($activity['published']) && empty($item['published'])) {
 642                         $item['published'] = $activity['published'];
 643                 }
 644
 645                 if (!empty($activity['updated']) && empty($item['updated'])) {
 646                         $item['updated'] = $activity['updated'];
 647                 }
 648
 649                 if (!empty($activity['inReplyTo']) && empty($item['parent-uri'])) {
 650                         $item['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
 651                 }
 652
 653                 if (!empty($activity['instrument'])) {
 654                         $item['service'] = self::processElement($activity, 'instrument', 'name', 'Service');
 655                 }
 656
 657                 // Remove all "null" fields
 658                 foreach ($item as $field => $content) {
 659                         if (is_null($content)) {
 660                                 unset($item[$field]);
 661                         }
 662                 }
 663
 664                 return $item;
 665         }
 666
 667         private static function fetchObject($object_url, $url)
 668         {
 669                 $data = self::fetchContent($object_url);
 670                 if (empty($data)) {
 671                         return false;
 672                 }
 673
 674                 if (empty($data['type'])) {
 675                         return false;
 676                 } else {
 677                         $type = $data['type'];
 678                 }
 679
 680                 if (in_array($type, ['Note', 'Article', 'Video'])) {
 681                         $common = self::processCommonData($data, $url);
 682                 }
 683
 684                 switch ($type) {
 685                         case 'Note':
 686                                 return array_merge($common, self::processNote($data, $url));
 687                         case 'Article':
 688                                 return array_merge($common, self::processArticle($data, $url));
 689                         case 'Video':
 690                                 return array_merge($common, self::processVideo($data, $url));
 691
 692                         case 'Announce':
 693                                 if (empty($data['object'])) {
 694                                         return false;
 695                                 }
 696                                 return self::fetchObject($data['object'], $url);
 697
 698                         case 'Person':
 699                         case 'Tombstone':
 700                                 break;
 701
 702                         default:
 703                                 echo "Unknown object type: ".$data['type']."\n";
 704                                 print_r($data);
 705                                 die($url."\n");
 706                                 break;
 707                 }
 708         }
 709
 710         private static function processCommonData(&$object, $url)
 711         {
 712                 if (empty($object['id']) || empty($object['attributedTo'])) {
 713                         return false;
 714                 }
 715
 716                 $item = [];
 717                 $item['uri'] = $object['id'];
 718
 719                 if (!empty($object['inReplyTo'])) {
 720                         $item['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
 721                 } else {
 722                         $item['reply-to-uri'] = $item['uri'];
 723                 }
 724
 725                 $item['published'] = defaults($object, 'published', null);
 726                 $item['updated'] = defaults($object, 'updated', $item['published']);
 727
 728                 if (empty($item['published']) && !empty($item['updated'])) {
 729                         $item['published'] = $item['updated'];
 730                 }
 731
 732                 $item['uuid'] = defaults($object, 'uuid', null);
 733                 $item['owner'] = $item['author'] = self::processElement($object, 'attributedTo', 'id');
 734                 $item['context'] = defaults($object, 'context', null);
 735                 $item['conversation'] = defaults($object, 'conversation', null);
 736                 $item['sensitive'] = defaults($object, 'sensitive', null);
 737                 $item['name'] = defaults($object, 'title', null);
 738                 $item['name'] = defaults($object, 'name', $item['name']);
 739                 $item['summary'] = defaults($object, 'summary', null);
 740                 $item['content'] = defaults($object, 'content', null);
 741                 $item['location'] = self::processElement($object, 'location', 'name', 'Place');
 742                 $item['attachments'] = defaults($object, 'attachment', null);
 743                 $item['tags'] = defaults($object, 'tag', null);
 744                 $item['service'] = self::processElement($object, 'instrument', 'name', 'Service');
 745                 $item['alternate-url'] = self::processElement($object, 'url', 'href');
 746                 $item['receiver'] = self::getReceivers($object);
 747
 748                 // handled
 749                 unset($object['id']);
 750                 unset($object['inReplyTo']);
 751                 unset($object['published']);
 752                 unset($object['updated']);
 753                 unset($object['uuid']);
 754                 unset($object['attributedTo']);
 755                 unset($object['context']);
 756                 unset($object['conversation']);
 757                 unset($object['sensitive']);
 758                 unset($object['name']);
 759                 unset($object['title']);
 760                 unset($object['content']);
 761                 unset($object['summary']);
 762                 unset($object['location']);
 763                 unset($object['attachment']);
 764                 unset($object['tag']);
 765                 unset($object['instrument']);
 766                 unset($object['url']);
 767                 unset($object['to']);
 768                 unset($object['cc']);
 769                 unset($object['bto']);
 770                 unset($object['bcc']);
 771
 772                 // To-Do
 773                 unset($object['source']);
 774
 775                 // Unhandled
 776                 unset($object['@context']);
 777                 unset($object['type']);
 778                 unset($object['actor']);
 779                 unset($object['signature']);
 780                 unset($object['mediaType']);
 781                 unset($object['duration']);
 782                 unset($object['replies']);
 783                 unset($object['icon']);
 784
 785                 /*
 786                 audience, preview, endTime, startTime, generator, image
 787                 */
 788
 789                 return $item;
 790         }
 791
 792         private static function processNote($object, $url)
 793         {
 794                 $item = [];
 795
 796                 // To-Do?
 797                 unset($object['emoji']);
 798                 unset($object['atomUri']);
 799                 unset($object['inReplyToAtomUri']);
 800
 801                 // Unhandled
 802                 unset($object['contentMap']);
 803                 unset($object['announcement_count']);
 804                 unset($object['announcements']);
 805                 unset($object['context_id']);
 806                 unset($object['likes']);
 807                 unset($object['like_count']);
 808                 unset($object['inReplyToStatusId']);
 809                 unset($object['shares']);
 810                 unset($object['quoteUrl']);
 811                 unset($object['statusnetConversationId']);
 812
 813                 if (empty($object))
 814                         return $item;
 815
 816                 echo "Unknown Note\n";
 817                 print_r($object);
 818                 print_r($item);
 819                 die($url."\n");
 820
 821                 return [];
 822         }
 823
 824         private static function processArticle($object, $url)
 825         {
 826                 $item = [];
 827
 828                 if (empty($object))
 829                         return $item;
 830
 831                 echo "Unknown Article\n";
 832                 print_r($object);
 833                 print_r($item);
 834                 die($url."\n");
 835
 836                 return [];
 837         }
 838
 839         private static function processVideo($object, $url)
 840         {
 841                 $item = [];
 842
 843                 // To-Do?
 844                 unset($object['category']);
 845                 unset($object['licence']);
 846                 unset($object['language']);
 847                 unset($object['commentsEnabled']);
 848
 849                 // Unhandled
 850                 unset($object['views']);
 851                 unset($object['waitTranscoding']);
 852                 unset($object['state']);
 853                 unset($object['support']);
 854                 unset($object['subtitleLanguage']);
 855                 unset($object['likes']);
 856                 unset($object['dislikes']);
 857                 unset($object['shares']);
 858                 unset($object['comments']);
 859
 860                 if (empty($object))
 861                         return $item;
 862
 863                 echo "Unknown Video\n";
 864                 print_r($object);
 865                 print_r($item);
 866                 die($url."\n");
 867
 868                 return [];
 869         }
 870
 871         private static function processElement($array, $element, $key, $type = null)
 872         {
 873                 if (empty($array)) {
 874                         return false;
 875                 }
 876
 877                 if (empty($array[$element])) {
 878                         return false;
 879                 }
 880
 881                 if (is_string($array[$element])) {
 882                         return $array[$element];
 883                 }
 884
 885                 if (is_null($type)) {
 886                         if (!empty($array[$element][$key])) {
 887                                 return $array[$element][$key];
 888                         }
 889
 890                         if (!empty($array[$element][0][$key])) {
 891                                 return $array[$element][0][$key];
 892                         }
 893
 894                         return false;
 895                 }
 896
 897                 if (!empty($array[$element][$key]) && !empty($array[$element]['type']) && ($array[$element]['type'] == $type)) {
 898                         return $array[$element][$key];
 899                 }
 900
 901                 /// @todo Add array search
 902
 903                 return false;
 904         }
 905
 906         private static function createItem($item)
 907         {
 908 //              print_r($item);
 909         }
 910
 911         private static function announceItem($item)
 912         {
 913 //              print_r($item);
 914         }
 915
 916         private static function activityItem($item)
 917         {
 918         //      print_r($item);
 919         }
 920
 921 }