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