src/Protocol/ActivityPub/Receiver.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Receiver.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\Database\DBA;
   8 use Friendica\Core\Logger;
   9 use Friendica\Core\Protocol;
  10 use Friendica\Model\Contact;
  11 use Friendica\Model\APContact;
  12 use Friendica\Model\Conversation;
  13 use Friendica\Model\Item;
  14 use Friendica\Model\User;
  15 use Friendica\Protocol\ActivityPub;
  16 use Friendica\Util\DateTimeFormat;
  17 use Friendica\Util\HTTPSignature;
  18 use Friendica\Util\JsonLD;
  19 use Friendica\Util\LDSignature;
  20 use Friendica\Util\Strings;
  21
  22 /**
  23  * @brief ActivityPub Receiver Protocol class
  24  *
  25  * To-Do:
  26  * - Undo Announce
  27  *
  28  * Check what this is meant to do:
  29  * - Add
  30  * - Block
  31  * - Flag
  32  * - Remove
  33  * - Undo Block
  34  */
  35 class Receiver
  36 {
  37         const PUBLIC_COLLECTION = 'as:Public';
  38         const ACCOUNT_TYPES = ['as:Person', 'as:Organization', 'as:Service', 'as:Group', 'as:Application'];
  39         const CONTENT_TYPES = ['as:Note', 'as:Article', 'as:Video', 'as:Image', 'as:Event'];
  40         const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
  41
  42         /**
  43          * Checks if the web request is done for the AP protocol
  44          *
  45          * @return is it AP?
  46          */
  47         public static function isRequest()
  48         {
  49                 return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
  50                         stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
  51         }
  52
  53         /**
  54          * Checks incoming message from the inbox
  55          *
  56          * @param $body
  57          * @param $header
  58          * @param integer $uid User ID
  59          */
  60         public static function processInbox($body, $header, $uid)
  61         {
  62                 $http_signer = HTTPSignature::getSigner($body, $header);
  63                 if (empty($http_signer)) {
  64                         Logger::log('Invalid HTTP signature, message will be discarded.', Logger::DEBUG);
  65                         return;
  66                 } else {
  67                         Logger::log('HTTP signature is signed by ' . $http_signer, Logger::DEBUG);
  68                 }
  69
  70                 $activity = json_decode($body, true);
  71
  72                 if (empty($activity)) {
  73                         Logger::log('Invalid body.', Logger::DEBUG);
  74                         return;
  75                 }
  76
  77                 $ldactivity = JsonLD::compact($activity);
  78
  79                 $actor = JsonLD::fetchElement($ldactivity, 'as:actor');
  80
  81                 Logger::log('Message for user ' . $uid . ' is from actor ' . $actor, Logger::DEBUG);
  82
  83                 if (LDSignature::isSigned($activity)) {
  84                         $ld_signer = LDSignature::getSigner($activity);
  85                         if (empty($ld_signer)) {
  86                                 Logger::log('Invalid JSON-LD signature from ' . $actor, Logger::DEBUG);
  87                         }
  88                         if (!empty($ld_signer && ($actor == $http_signer))) {
  89                                 Logger::log('The HTTP and the JSON-LD signature belong to ' . $ld_signer, Logger::DEBUG);
  90                                 $trust_source = true;
  91                         } elseif (!empty($ld_signer)) {
  92                                 Logger::log('JSON-LD signature is signed by ' . $ld_signer, Logger::DEBUG);
  93                                 $trust_source = true;
  94                         } elseif ($actor == $http_signer) {
  95                                 Logger::log('Bad JSON-LD signature, but HTTP signer fits the actor.', Logger::DEBUG);
  96                                 $trust_source = true;
  97                         } else {
  98                                 Logger::log('Invalid JSON-LD signature and the HTTP signer is different.', Logger::DEBUG);
  99                                 $trust_source = false;
 100                         }
 101                 } elseif ($actor == $http_signer) {
 102                         Logger::log('Trusting post without JSON-LD signature, The actor fits the HTTP signer.', Logger::DEBUG);
 103                         $trust_source = true;
 104                 } else {
 105                         Logger::log('No JSON-LD signature, different actor.', Logger::DEBUG);
 106                         $trust_source = false;
 107                 }
 108
 109                 self::processActivity($ldactivity, $body, $uid, $trust_source);
 110         }
 111
 112         /**
 113          * Fetches the object type for a given object id
 114          *
 115          * @param array   $activity
 116          * @param string  $object_id Object ID of the the provided object
 117          * @param integer $uid User ID
 118          *
 119          * @return string with object type
 120          */
 121         private static function fetchObjectType($activity, $object_id, $uid = 0)
 122         {
 123                 if (!empty($activity['as:object'])) {
 124                         $object_type = JsonLD::fetchElement($activity['as:object'], '@type');
 125                         if (!empty($object_type)) {
 126                                 return $object_type;
 127                         }
 128                 }
 129
 130                 if (Item::exists(['uri' => $object_id, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT]])) {
 131                         // We just assume "note" since it doesn't make a difference for the further processing
 132                         return 'as:Note';
 133                 }
 134
 135                 $profile = APContact::getByURL($object_id);
 136                 if (!empty($profile['type'])) {
 137                         return 'as:' . $profile['type'];
 138                 }
 139
 140                 $data = ActivityPub::fetchContent($object_id, $uid);
 141                 if (!empty($data)) {
 142                         $object = JsonLD::compact($data);
 143                         $type = JsonLD::fetchElement($object, '@type');
 144                         if (!empty($type)) {
 145                                 return $type;
 146                         }
 147                 }
 148
 149                 return null;
 150         }
 151
 152         /**
 153          * Prepare the object array
 154          *
 155          * @param array $activity
 156          * @param integer $uid User ID
 157          * @param $trust_source
 158          *
 159          * @return array with object data
 160          */
 161         private static function prepareObjectData($activity, $uid, &$trust_source)
 162         {
 163                 $actor = JsonLD::fetchElement($activity, 'as:actor');
 164                 if (empty($actor)) {
 165                         Logger::log('Empty actor', Logger::DEBUG);
 166                         return [];
 167                 }
 168
 169                 $type = JsonLD::fetchElement($activity, '@type');
 170
 171                 // Fetch all receivers from to, cc, bto and bcc
 172                 $receivers = self::getReceivers($activity, $actor);
 173
 174                 // When it is a delivery to a personal inbox we add that user to the receivers
 175                 if (!empty($uid)) {
 176                         $additional = ['uid:' . $uid => $uid];
 177                         $receivers = array_merge($receivers, $additional);
 178                 } else {
 179                         // We possibly need some user to fetch private content,
 180                         // so we fetch the first out ot the list.
 181                         $uid = self::getFirstUserFromReceivers($receivers);
 182                 }
 183
 184                 Logger::log('Receivers: ' . $uid . ' - ' . json_encode($receivers), Logger::DEBUG);
 185
 186                 $object_id = JsonLD::fetchElement($activity, 'as:object');
 187                 if (empty($object_id)) {
 188                         Logger::log('No object found', Logger::DEBUG);
 189                         return [];
 190                 }
 191
 192                 $object_type = self::fetchObjectType($activity, $object_id, $uid);
 193
 194                 // Fetch the content only on activities where this matters
 195                 if (in_array($type, ['as:Create', 'as:Update', 'as:Announce'])) {
 196                         if ($type == 'as:Announce') {
 197                                 $trust_source = false;
 198                         }
 199                         $object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source, $uid);
 200                         if (empty($object_data)) {
 201                                 Logger::log("Object data couldn't be processed", Logger::DEBUG);
 202                                 return [];
 203                         }
 204                         // We had been able to retrieve the object data - so we can trust the source
 205                         $trust_source = true;
 206                 } elseif (in_array($type, ['as:Like', 'as:Dislike'])) {
 207                         // Create a mostly empty array out of the activity data (instead of the object).
 208                         // This way we later don't have to check for the existence of ech individual array element.
 209                         $object_data = self::processObject($activity);
 210                         $object_data['name'] = $type;
 211                         $object_data['author'] = JsonLD::fetchElement($activity, 'as:actor');
 212                         $object_data['object_id'] = $object_id;
 213                         $object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
 214                 } else {
 215                         $object_data = [];
 216                         $object_data['id'] = JsonLD::fetchElement($activity, '@id');
 217                         $object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object');
 218                         $object_data['object_actor'] = JsonLD::fetchElement($activity['as:object'], 'as:actor');
 219                         $object_data['object_object'] = JsonLD::fetchElement($activity['as:object'], 'as:object');
 220                         $object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
 221
 222                         // An Undo is done on the object of an object, so we need that type as well
 223                         if ($type == 'as:Undo') {
 224                                 $object_data['object_object_type'] = self::fetchObjectType([], $object_data['object_object'], $uid);
 225                         }
 226                 }
 227
 228                 $object_data = self::addActivityFields($object_data, $activity);
 229
 230                 if (empty($object_data['object_type'])) {
 231                         $object_data['object_type'] = $object_type;
 232                 }
 233
 234                 $object_data['type'] = $type;
 235                 $object_data['actor'] = $actor;
 236                 $object_data['receiver'] = array_merge(defaults($object_data, 'receiver', []), $receivers);
 237
 238                 Logger::log('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id'], Logger::DEBUG);
 239
 240                 return $object_data;
 241         }
 242
 243         /**
 244          * Fetches the first user id from the receiver array
 245          *
 246          * @param array $receivers Array with receivers
 247          * @return integer user id;
 248          */
 249         public static function getFirstUserFromReceivers($receivers)
 250         {
 251                 foreach ($receivers as $receiver) {
 252                         if (!empty($receiver)) {
 253                                 return $receiver;
 254                         }
 255                 }
 256                 return 0;
 257         }
 258
 259         /**
 260          * Store the unprocessed data into the conversation table
 261          * This has to be done outside the regular function,
 262          * since we store everything - not only item posts.
 263          *
 264          * @param array  $activity Array with activity data
 265          * @param string $body     The raw message
 266          */
 267         private static function storeConversation($activity, $body)
 268         {
 269                 if (empty($body) || empty($activity['id'])) {
 270                         return;
 271                 }
 272
 273                 $conversation = [
 274                         'protocol' => Conversation::PARCEL_ACTIVITYPUB,
 275                         'item-uri' => $activity['id'],
 276                         'reply-to-uri' => defaults($activity, 'reply-to-id', ''),
 277                         'conversation-href' => defaults($activity, 'context', ''),
 278                         'conversation-uri' => defaults($activity, 'conversation', ''),
 279                         'source' => $body,
 280                         'received' => DateTimeFormat::utcNow()];
 281
 282                 DBA::insert('conversation', $conversation, true);
 283         }
 284
 285         /**
 286          * Processes the activity object
 287          *
 288          * @param array   $activity     Array with activity data
 289          * @param string  $body
 290          * @param integer $uid          User ID
 291          * @param boolean $trust_source Do we trust the source?
 292          */
 293         public static function processActivity($activity, $body = '', $uid = null, $trust_source = false)
 294         {
 295                 $type = JsonLD::fetchElement($activity, '@type');
 296                 if (!$type) {
 297                         Logger::log('Empty type', Logger::DEBUG);
 298                         return;
 299                 }
 300
 301                 if (!JsonLD::fetchElement($activity, 'as:object')) {
 302                         Logger::log('Empty object', Logger::DEBUG);
 303                         return;
 304                 }
 305
 306                 if (!JsonLD::fetchElement($activity, 'as:actor')) {
 307                         Logger::log('Empty actor', Logger::DEBUG);
 308                         return;
 309
 310                 }
 311
 312                 // Don't trust the source if "actor" differs from "attributedTo". The content could be forged.
 313                 if ($trust_source && ($type == 'as:Create') && is_array($activity['as:object'])) {
 314                         $actor = JsonLD::fetchElement($activity, 'as:actor');
 315                         $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo');
 316                         $trust_source = ($actor == $attributed_to);
 317                         if (!$trust_source) {
 318                                 Logger::log('Not trusting actor: ' . $actor . '. It differs from attributedTo: ' . $attributed_to, Logger::DEBUG);
 319                         }
 320                 }
 321
 322                 // $trust_source is called by reference and is set to true if the content was retrieved successfully
 323                 $object_data = self::prepareObjectData($activity, $uid, $trust_source);
 324                 if (empty($object_data)) {
 325                         Logger::log('No object data found', Logger::DEBUG);
 326                         return;
 327                 }
 328
 329                 if (!$trust_source) {
 330                         Logger::log('No trust for activity type "' . $type . '", so we quit now.', Logger::DEBUG);
 331                         return;
 332                 }
 333
 334                 self::storeConversation($object_data, $body);
 335
 336                 // Internal flag for thread completion. See Processor.php
 337                 if (!empty($activity['thread-completion'])) {
 338                         $object_data['thread-completion'] = $activity['thread-completion'];
 339                 }
 340
 341                 switch ($type) {
 342                         case 'as:Create':
 343                         case 'as:Announce':
 344                                 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 345                                         ActivityPub\Processor::createItem($object_data);
 346                                 }
 347                                 break;
 348
 349                         case 'as:Like':
 350                                 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 351                                         ActivityPub\Processor::createActivity($object_data, ACTIVITY_LIKE);
 352                                 }
 353                                 break;
 354
 355                         case 'as:Dislike':
 356                                 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 357                                         ActivityPub\Processor::createActivity($object_data, ACTIVITY_DISLIKE);
 358                                 }
 359                                 break;
 360
 361                         case 'as:TentativeAccept':
 362                                 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 363                                         ActivityPub\Processor::createActivity($object_data, ACTIVITY_ATTENDMAYBE);
 364                                 }
 365                                 break;
 366
 367                         case 'as:Update':
 368                                 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 369                                         ActivityPub\Processor::updateItem($object_data);
 370                                 } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
 371                                         ActivityPub\Processor::updatePerson($object_data, $body);
 372                                 }
 373                                 break;
 374
 375                         case 'as:Delete':
 376                                 if ($object_data['object_type'] == 'as:Tombstone') {
 377                                         ActivityPub\Processor::deleteItem($object_data, $body);
 378                                 } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
 379                                         ActivityPub\Processor::deletePerson($object_data, $body);
 380                                 }
 381                                 break;
 382
 383                         case 'as:Follow':
 384                                 if (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
 385                                         ActivityPub\Processor::followUser($object_data);
 386                                 }
 387                                 break;
 388
 389                         case 'as:Accept':
 390                                 if ($object_data['object_type'] == 'as:Follow') {
 391                                         ActivityPub\Processor::acceptFollowUser($object_data);
 392                                 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 393                                         ActivityPub\Processor::createActivity($object_data, ACTIVITY_ATTEND);
 394                                 }
 395                                 break;
 396
 397                         case 'as:Reject':
 398                                 if ($object_data['object_type'] == 'as:Follow') {
 399                                         ActivityPub\Processor::rejectFollowUser($object_data);
 400                                 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
 401                                         ActivityPub\Processor::createActivity($object_data, ACTIVITY_ATTENDNO);
 402                                 }
 403                                 break;
 404
 405                         case 'as:Undo':
 406                                 if (($object_data['object_type'] == 'as:Follow') &&
 407                                         in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
 408                                         ActivityPub\Processor::undoFollowUser($object_data);
 409                                 } elseif (($object_data['object_type'] == 'as:Accept') &&
 410                                         in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
 411                                         ActivityPub\Processor::rejectFollowUser($object_data);
 412                                 } elseif (in_array($object_data['object_type'], self::ACTIVITY_TYPES) &&
 413                                         in_array($object_data['object_object_type'], self::CONTENT_TYPES)) {
 414                                         ActivityPub\Processor::undoActivity($object_data);
 415                                 }
 416                                 break;
 417
 418                         default:
 419                                 Logger::log('Unknown activity: ' . $type . ' ' . $object_data['object_type'], Logger::DEBUG);
 420                                 break;
 421                 }
 422         }
 423
 424         /**
 425          * Fetch the receiver list from an activity array
 426          *
 427          * @param array $activity
 428          * @param string $actor
 429          * @param array $tags
 430          *
 431          * @return array with receivers (user id)
 432          */
 433         private static function getReceivers($activity, $actor, $tags = [])
 434         {
 435                 $receivers = [];
 436
 437                 // When it is an answer, we inherite the receivers from the parent
 438                 $replyto = JsonLD::fetchElement($activity, 'as:inReplyTo');
 439                 if (!empty($replyto)) {
 440                         $parents = Item::select(['uid'], ['uri' => $replyto]);
 441                         while ($parent = Item::fetch($parents)) {
 442                                 $receivers['uid:' . $parent['uid']] = $parent['uid'];
 443                         }
 444                 }
 445
 446                 if (!empty($actor)) {
 447                         $profile = APContact::getByURL($actor);
 448                         $followers = defaults($profile, 'followers', '');
 449
 450                         Logger::log('Actor: ' . $actor . ' - Followers: ' . $followers, Logger::DEBUG);
 451                 } else {
 452                         Logger::log('Empty actor', Logger::DEBUG);
 453                         $followers = '';
 454                 }
 455
 456                 foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
 457                         $receiver_list = JsonLD::fetchElementArray($activity, $element);
 458                         if (empty($receiver_list)) {
 459                                 continue;
 460                         }
 461
 462                         foreach ($receiver_list as $receiver) {
 463                                 if ($receiver == self::PUBLIC_COLLECTION) {
 464                                         $receivers['uid:0'] = 0;
 465                                 }
 466
 467                                 if (($receiver == self::PUBLIC_COLLECTION) && !empty($actor)) {
 468                                         // This will most likely catch all OStatus connections to Mastodon
 469                                         $condition = ['alias' => [$actor, Strings::normaliseLink($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]
 470                                                 , 'archive' => false, 'pending' => false];
 471                                         $contacts = DBA::select('contact', ['uid'], $condition);
 472                                         while ($contact = DBA::fetch($contacts)) {
 473                                                 if ($contact['uid'] != 0) {
 474                                                         $receivers['uid:' . $contact['uid']] = $contact['uid'];
 475                                                 }
 476                                         }
 477                                         DBA::close($contacts);
 478                                 }
 479
 480                                 if (in_array($receiver, [$followers, self::PUBLIC_COLLECTION]) && !empty($actor)) {
 481                                         $receivers = array_merge($receivers, self::getReceiverForActor($actor, $tags));
 482                                         continue;
 483                                 }
 484
 485                                 // Fetching all directly addressed receivers
 486                                 $condition = ['self' => true, 'nurl' => Strings::normaliseLink($receiver)];
 487                                 $contact = DBA::selectFirst('contact', ['uid', 'contact-type'], $condition);
 488                                 if (!DBA::isResult($contact)) {
 489                                         continue;
 490                                 }
 491
 492                                 // Check if the potential receiver is following the actor
 493                                 // Exception: The receiver is targetted via "to" or this is a comment
 494                                 if ((($element != 'as:to') && empty($replyto)) || ($contact['contact-type'] == Contact::ACCOUNT_TYPE_COMMUNITY)) {
 495                                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 496                                         $condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
 497                                                 'network' => $networks, 'archive' => false, 'pending' => false, 'uid' => $contact['uid']];
 498
 499                                         // Forum posts are only accepted from forum contacts
 500                                         if ($contact['contact-type'] == Contact::ACCOUNT_TYPE_COMMUNITY) {
 501                                                 $condition['rel'] = [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER];
 502                                         }
 503
 504                                         if (!DBA::exists('contact', $condition)) {
 505                                                 continue;
 506                                         }
 507                                 }
 508
 509                                 $receivers['uid:' . $contact['uid']] = $contact['uid'];
 510                         }
 511                 }
 512
 513                 self::switchContacts($receivers, $actor);
 514
 515                 return $receivers;
 516         }
 517
 518         /**
 519          * Fetch the receiver list of a given actor
 520          *
 521          * @param string $actor
 522          * @param array $tags
 523          *
 524          * @return array with receivers (user id)
 525          */
 526         public static function getReceiverForActor($actor, $tags)
 527         {
 528                 $receivers = [];
 529                 $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 530                 $condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
 531                         'network' => $networks, 'archive' => false, 'pending' => false];
 532                 $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
 533                 while ($contact = DBA::fetch($contacts)) {
 534                         if (self::isValidReceiverForActor($contact, $actor, $tags)) {
 535                                 $receivers['uid:' . $contact['uid']] = $contact['uid'];
 536                         }
 537                 }
 538                 DBA::close($contacts);
 539                 return $receivers;
 540         }
 541
 542         /**
 543          * Tests if the contact is a valid receiver for this actor
 544          *
 545          * @param array $contact
 546          * @param string $actor
 547          * @param array $tags
 548          *
 549          * @return array with receivers (user id)
 550          */
 551         private static function isValidReceiverForActor($contact, $actor, $tags)
 552         {
 553                 // Public contacts are no valid receiver
 554                 if ($contact['uid'] == 0) {
 555                         return false;
 556                 }
 557
 558                 // Are we following the contact? Then this is a valid receiver
 559                 if (in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND])) {
 560                         return true;
 561                 }
 562
 563                 // When the possible receiver isn't a community, then it is no valid receiver
 564                 $owner = User::getOwnerDataById($contact['uid']);
 565                 if (empty($owner) || ($owner['contact-type'] != Contact::ACCOUNT_TYPE_COMMUNITY)) {
 566                         return false;
 567                 }
 568
 569                 // Is the community account tagged?
 570                 foreach ($tags as $tag) {
 571                         if ($tag['type'] != 'Mention') {
 572                                 continue;
 573                         }
 574
 575                         if ($tag['href'] == $owner['url']) {
 576                                 return true;
 577                         }
 578                 }
 579
 580                 return false;
 581         }
 582
 583         /**
 584          * Switches existing contacts to ActivityPub
 585          *
 586          * @param integer $cid Contact ID
 587          * @param integer $uid User ID
 588          * @param string $url Profile URL
 589          */
 590         public static function switchContact($cid, $uid, $url)
 591         {
 592                 $profile = ActivityPub::probeProfile($url);
 593                 if (empty($profile)) {
 594                         return;
 595                 }
 596
 597                 Logger::log('Switch contact ' . $cid . ' (' . $profile['url'] . ') for user ' . $uid . ' to ActivityPub');
 598
 599                 $photo = defaults($profile, 'photo', null);
 600                 unset($profile['photo']);
 601                 unset($profile['baseurl']);
 602                 unset($profile['guid']);
 603
 604                 $profile['nurl'] = Strings::normaliseLink($profile['url']);
 605                 DBA::update('contact', $profile, ['id' => $cid]);
 606
 607                 Contact::updateAvatar($photo, $uid, $cid);
 608
 609                 // Send a new follow request to be sure that the connection still exists
 610                 if (($uid != 0) && DBA::exists('contact', ['id' => $cid, 'rel' => [Contact::SHARING, Contact::FRIEND]])) {
 611                         ActivityPub\Transmitter::sendActivity('Follow', $profile['url'], $uid);
 612                         Logger::log('Send a new follow request to ' . $profile['url'] . ' for user ' . $uid, Logger::DEBUG);
 613                 }
 614         }
 615
 616         /**
 617          *
 618          *
 619          * @param $receivers
 620          * @param $actor
 621          */
 622         private static function switchContacts($receivers, $actor)
 623         {
 624                 if (empty($actor)) {
 625                         return;
 626                 }
 627
 628                 foreach ($receivers as $receiver) {
 629                         $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
 630                         if (DBA::isResult($contact)) {
 631                                 self::switchContact($contact['id'], $receiver, $actor);
 632                         }
 633
 634                         $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
 635                         if (DBA::isResult($contact)) {
 636                                 self::switchContact($contact['id'], $receiver, $actor);
 637                         }
 638                 }
 639         }
 640
 641         /**
 642          *
 643          *
 644          * @param $object_data
 645          * @param array $activity
 646          *
 647          * @return
 648          */
 649         private static function addActivityFields($object_data, $activity)
 650         {
 651                 if (!empty($activity['published']) && empty($object_data['published'])) {
 652                         $object_data['published'] = JsonLD::fetchElement($activity, 'as:published', '@value');
 653                 }
 654
 655                 if (!empty($activity['diaspora:guid']) && empty($object_data['diaspora:guid'])) {
 656                         $object_data['diaspora:guid'] = JsonLD::fetchElement($activity, 'diaspora:guid');
 657                 }
 658
 659                 $object_data['service'] = JsonLD::fetchElement($activity, 'as:instrument', 'as:name', '@type', 'as:Service');
 660
 661                 return $object_data;
 662         }
 663
 664         /**
 665          * Fetches the object data from external ressources if needed
 666          *
 667          * @param string  $object_id    Object ID of the the provided object
 668          * @param array   $object       The provided object array
 669          * @param boolean $trust_source Do we trust the provided object?
 670          * @param integer $uid          User ID for the signature that we use to fetch data
 671          *
 672          * @return array with trusted and valid object data
 673          */
 674         private static function fetchObject($object_id, $object = [], $trust_source = false, $uid = 0)
 675         {
 676                 // By fetching the type we check if the object is complete.
 677                 $type = JsonLD::fetchElement($object, '@type');
 678
 679                 if (!$trust_source || empty($type)) {
 680                         $data = ActivityPub::fetchContent($object_id, $uid);
 681                         if (!empty($data)) {
 682                                 $object = JsonLD::compact($data);
 683                                 Logger::log('Fetched content for ' . $object_id, Logger::DEBUG);
 684                         } else {
 685                                 Logger::log('Empty content for ' . $object_id . ', check if content is available locally.', Logger::DEBUG);
 686
 687                                 $item = Item::selectFirst([], ['uri' => $object_id]);
 688                                 if (!DBA::isResult($item)) {
 689                                         Logger::log('Object with url ' . $object_id . ' was not found locally.', Logger::DEBUG);
 690                                         return false;
 691                                 }
 692                                 Logger::log('Using already stored item for url ' . $object_id, Logger::DEBUG);
 693                                 $data = ActivityPub\Transmitter::createNote($item);
 694                                 $object = JsonLD::compact($data);
 695                         }
 696                 } else {
 697                         Logger::log('Using original object for url ' . $object_id, Logger::DEBUG);
 698                 }
 699
 700                 $type = JsonLD::fetchElement($object, '@type');
 701
 702                 if (empty($type)) {
 703                         Logger::log('Empty type', Logger::DEBUG);
 704                         return false;
 705                 }
 706
 707                 if (in_array($type, self::CONTENT_TYPES)) {
 708                         return self::processObject($object);
 709                 }
 710
 711                 if ($type == 'as:Announce') {
 712                         $object_id = JsonLD::fetchElement($object, 'object');
 713                         if (empty($object_id)) {
 714                                 return false;
 715                         }
 716                         return self::fetchObject($object_id, [], false, $uid);
 717                 }
 718
 719                 Logger::log('Unhandled object type: ' . $type, Logger::DEBUG);
 720         }
 721
 722         /**
 723          * Convert tags from JSON-LD format into a simplified format
 724          *
 725          * @param array $tags Tags in JSON-LD format
 726          *
 727          * @return array with tags in a simplified format
 728          */
 729         private static function processTags($tags)
 730         {
 731                 $taglist = [];
 732
 733                 if (empty($tags)) {
 734                         return [];
 735                 }
 736
 737                 foreach ($tags as $tag) {
 738                         if (empty($tag)) {
 739                                 continue;
 740                         }
 741
 742                         $element = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
 743                                 'href' => JsonLD::fetchElement($tag, 'as:href'),
 744                                 'name' => JsonLD::fetchElement($tag, 'as:name')];
 745
 746                         if (empty($element['type'])) {
 747                                 continue;
 748                         }
 749
 750                         $taglist[] = $element;
 751                 }
 752                 return $taglist;
 753         }
 754
 755         /**
 756          * Convert emojis from JSON-LD format into a simplified format
 757          *
 758          * @param array $tags Tags in JSON-LD format
 759          *
 760          * @return array with emojis in a simplified format
 761          */
 762         private static function processEmojis($emojis)
 763         {
 764                 $emojilist = [];
 765
 766                 if (empty($emojis)) {
 767                         return [];
 768                 }
 769
 770                 foreach ($emojis as $emoji) {
 771                         if (empty($emoji) || (JsonLD::fetchElement($emoji, '@type') != 'toot:Emoji') || empty($emoji['as:icon'])) {
 772                                 continue;
 773                         }
 774
 775                         $url = JsonLD::fetchElement($emoji['as:icon'], 'as:url');
 776                         $element = ['name' => JsonLD::fetchElement($emoji, 'as:name'),
 777                                 'href' => $url];
 778
 779                         $emojilist[] = $element;
 780                 }
 781                 return $emojilist;
 782         }
 783
 784         /**
 785          * Convert attachments from JSON-LD format into a simplified format
 786          *
 787          * @param array $attachments Attachments in JSON-LD format
 788          *
 789          * @return array with attachmants in a simplified format
 790          */
 791         private static function processAttachments($attachments)
 792         {
 793                 $attachlist = [];
 794
 795                 if (empty($attachments)) {
 796                         return [];
 797                 }
 798
 799                 foreach ($attachments as $attachment) {
 800                         if (empty($attachment)) {
 801                                 continue;
 802                         }
 803
 804                         $attachlist[] = ['type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
 805                                 'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType'),
 806                                 'name' => JsonLD::fetchElement($attachment, 'as:name'),
 807                                 'url' => JsonLD::fetchElement($attachment, 'as:url')];
 808                 }
 809                 return $attachlist;
 810         }
 811
 812         /**
 813          * Fetches data from the object part of an activity
 814          *
 815          * @param array $object
 816          *
 817          * @return array
 818          */
 819         private static function processObject($object)
 820         {
 821                 if (!JsonLD::fetchElement($object, '@id')) {
 822                         return false;
 823                 }
 824
 825                 $object_data = [];
 826                 $object_data['object_type'] = JsonLD::fetchElement($object, '@type');
 827                 $object_data['id'] = JsonLD::fetchElement($object, '@id');
 828
 829                 $object_data['reply-to-id'] = JsonLD::fetchElement($object, 'as:inReplyTo');
 830
 831                 if (empty($object_data['reply-to-id'])) {
 832                         $object_data['reply-to-id'] = $object_data['id'];
 833                 }
 834
 835                 $object_data['published'] = JsonLD::fetchElement($object, 'as:published', '@value');
 836                 $object_data['updated'] = JsonLD::fetchElement($object, 'as:updated', '@value');
 837
 838                 if (empty($object_data['updated'])) {
 839                         $object_data['updated'] = $object_data['published'];
 840                 }
 841
 842                 if (empty($object_data['published']) && !empty($object_data['updated'])) {
 843                         $object_data['published'] = $object_data['updated'];
 844                 }
 845
 846                 $actor = JsonLD::fetchElement($object, 'as:attributedTo');
 847                 if (empty($actor)) {
 848                         $actor = JsonLD::fetchElement($object, 'as:actor');
 849                 }
 850
 851                 $object_data['diaspora:guid'] = JsonLD::fetchElement($object, 'diaspora:guid');
 852                 $object_data['diaspora:comment'] = JsonLD::fetchElement($object, 'diaspora:comment');
 853                 $object_data['diaspora:like'] = JsonLD::fetchElement($object, 'diaspora:like');
 854                 $object_data['actor'] = $object_data['author'] = $actor;
 855                 $object_data['context'] = JsonLD::fetchElement($object, 'as:context');
 856                 $object_data['conversation'] = JsonLD::fetchElement($object, 'ostatus:conversation');
 857                 $object_data['sensitive'] = JsonLD::fetchElement($object, 'as:sensitive');
 858                 $object_data['name'] = JsonLD::fetchElement($object, 'as:name');
 859                 $object_data['summary'] = JsonLD::fetchElement($object, 'as:summary');
 860                 $object_data['content'] = JsonLD::fetchElement($object, 'as:content');
 861                 $object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
 862                 $object_data['start-time'] = JsonLD::fetchElement($object, 'as:startTime', '@value');
 863                 $object_data['end-time'] = JsonLD::fetchElement($object, 'as:endTime', '@value');
 864                 $object_data['location'] = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
 865                 $object_data['latitude'] = JsonLD::fetchElement($object, 'as:location', 'as:latitude', '@type', 'as:Place');
 866                 $object_data['latitude'] = JsonLD::fetchElement($object_data, 'latitude', '@value');
 867                 $object_data['longitude'] = JsonLD::fetchElement($object, 'as:location', 'as:longitude', '@type', 'as:Place');
 868                 $object_data['longitude'] = JsonLD::fetchElement($object_data, 'longitude', '@value');
 869                 $object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment'));
 870                 $object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag'));
 871                 $object_data['emojis'] = self::processEmojis(JsonLD::fetchElementArray($object, 'as:tag', 'toot:Emoji'));
 872                 $object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
 873                 $object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url');
 874
 875                 // Special treatment for Hubzilla links
 876                 if (is_array($object_data['alternate-url'])) {
 877                         $object_data['alternate-url'] = JsonLD::fetchElement($object_data['alternate-url'], 'as:href');
 878
 879                         if (!is_string($object_data['alternate-url'])) {
 880                                 $object_data['alternate-url'] = JsonLD::fetchElement($object['as:url'], 'as:href');
 881                         }
 882                 }
 883
 884                 $object_data['receiver'] = self::getReceivers($object, $object_data['actor'], $object_data['tags']);
 885
 886                 // Common object data:
 887
 888                 // Unhandled
 889                 // @context, type, actor, signature, mediaType, duration, replies, icon
 890
 891                 // Also missing: (Defined in the standard, but currently unused)
 892                 // audience, preview, endTime, startTime, image
 893
 894                 // Data in Notes:
 895
 896                 // Unhandled
 897                 // contentMap, announcement_count, announcements, context_id, likes, like_count
 898                 // inReplyToStatusId, shares, quoteUrl, statusnetConversationId
 899
 900                 // Data in video:
 901
 902                 // To-Do?
 903                 // category, licence, language, commentsEnabled
 904
 905                 // Unhandled
 906                 // views, waitTranscoding, state, support, subtitleLanguage
 907                 // likes, dislikes, shares, comments
 908
 909                 return $object_data;
 910         }
 911 }