src/Protocol/ActivityPub/Processor.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Content\Text\HTML;
  26 use Friendica\Content\Text\Markdown;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\System;
  30 use Friendica\Core\Worker;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\APContact;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\Event;
  37 use Friendica\Model\GServer;
  38 use Friendica\Model\Item;
  39 use Friendica\Model\ItemURI;
  40 use Friendica\Model\Mail;
  41 use Friendica\Model\Tag;
  42 use Friendica\Model\User;
  43 use Friendica\Model\Post;
  44 use Friendica\Protocol\Activity;
  45 use Friendica\Protocol\ActivityPub;
  46 use Friendica\Protocol\Relay;
  47 use Friendica\Util\DateTimeFormat;
  48 use Friendica\Util\JsonLD;
  49 use Friendica\Util\Strings;
  50 use Friendica\Worker\Delivery;
  51
  52 /**
  53  * ActivityPub Processor Protocol class
  54  */
  55 class Processor
  56 {
  57         /**
  58          * Extracts the tag character (#, @, !) from mention links
  59          *
  60          * @param string $body
  61          * @return string
  62          */
  63         protected static function normalizeMentionLinks(string $body): string
  64         {
  65                 return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
  66         }
  67
  68         /**
  69          * Convert the language array into a language JSON
  70          *
  71          * @param array $languages
  72          * @return string language JSON
  73          */
  74         private static function processLanguages(array $languages): string
  75         {
  76                 $codes = array_keys($languages);
  77                 $lang = [];
  78                 foreach ($codes as $code) {
  79                         $lang[$code] = 1;
  80                 }
  81
  82                 if (empty($lang)) {
  83                         return '';
  84                 }
  85
  86                 return json_encode($lang);
  87         }
  88         /**
  89          * Replaces emojis in the body
  90          *
  91          * @param int $uri_id
  92          * @param string $body
  93          * @param array $emojis
  94          *
  95          * @return string with replaced emojis
  96          */
  97         private static function replaceEmojis(int $uri_id, string $body, array $emojis): string
  98         {
  99                 $body = strtr($body,
 100                         array_combine(
 101                                 array_column($emojis, 'name'),
 102                                 array_map(function ($emoji) {
 103                                         return '[emoji=' . $emoji['href'] . ']' . $emoji['name'] . '[/emoji]';
 104                                 }, $emojis)
 105                         )
 106                 );
 107
 108                 // We store the emoji here to be able to avoid storing it in the media
 109                 foreach ($emojis as $emoji) {
 110                         Post\Link::getByLink($uri_id, $emoji['href']);
 111                 }
 112                 return $body;
 113         }
 114
 115         /**
 116          * Store attached media files in the post-media table
 117          *
 118          * @param int $uriid
 119          * @param array $attachment
 120          * @return void
 121          */
 122         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
 123         {
 124                 if (empty($attachment['url'])) {
 125                         return;
 126                 }
 127
 128                 $data = ['uri-id' => $uriid];
 129                 $data['type'] = Post\Media::UNKNOWN;
 130                 $data['url'] = $attachment['url'];
 131                 $data['mimetype'] = $attachment['mediaType'] ?? null;
 132                 $data['height'] = $attachment['height'] ?? null;
 133                 $data['width'] = $attachment['width'] ?? null;
 134                 $data['size'] = $attachment['size'] ?? null;
 135                 $data['preview'] = $attachment['image'] ?? null;
 136                 $data['description'] = $attachment['name'] ?? null;
 137
 138                 Post\Media::insert($data);
 139         }
 140
 141         /**
 142          * Stire attachment data
 143          *
 144          * @param array   $activity
 145          * @param array   $item
 146          */
 147         private static function storeAttachments(array $activity, array $item)
 148         {
 149                 if (empty($activity['attachments'])) {
 150                         return;
 151                 }
 152
 153                 foreach ($activity['attachments'] as $attach) {
 154                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
 155                 }
 156         }
 157
 158         /**
 159          * Store attachment data
 160          *
 161          * @param array   $activity
 162          * @param array   $item
 163          */
 164         private static function storeQuestion(array $activity, array $item)
 165         {
 166                 if (empty($activity['question'])) {
 167                         return;
 168                 }
 169                 $question = ['multiple' => $activity['question']['multiple']];
 170
 171                 if (!empty($activity['question']['voters'])) {
 172                         $question['voters'] = $activity['question']['voters'];
 173                 }
 174
 175                 if (!empty($activity['question']['end-time'])) {
 176                         $question['end-time'] = DateTimeFormat::utc($activity['question']['end-time']);
 177                 }
 178
 179                 Post\Question::update($item['uri-id'], $question);
 180
 181                 foreach ($activity['question']['options'] as $key => $option) {
 182                         $option = ['name' => $option['name'], 'replies' => $option['replies']];
 183                         Post\QuestionOption::update($item['uri-id'], $key, $option);
 184                 }
 185
 186                 Logger::debug('Storing incoming question', ['type' => $activity['type'], 'uri-id' => $item['uri-id'], 'question' => $activity['question']]);
 187         }
 188
 189         /**
 190          * Updates a message
 191          *
 192          * @param array      $activity   Activity array
 193          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 194          * @throws \ImagickException
 195          */
 196         public static function updateItem(array $activity)
 197         {
 198                 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
 199                 if (!DBA::isResult($item)) {
 200                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 201                         $item = self::createItem($activity);
 202                         if (empty($item)) {
 203                                 return;
 204                         }
 205
 206                         self::postItem($activity, $item);
 207                         return;
 208                 }
 209
 210                 $item['changed'] = DateTimeFormat::utcNow();
 211                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 212
 213                 $item = self::processContent($activity, $item);
 214
 215                 self::storeAttachments($activity, $item);
 216                 self::storeQuestion($activity, $item);
 217
 218                 if (empty($item)) {
 219                         return;
 220                 }
 221
 222                 Post\History::add($item['uri-id'], $item);
 223                 Item::update($item, ['uri' => $activity['id']]);
 224
 225                 Queue::remove($activity);
 226
 227                 if ($activity['object_type'] == 'as:Event') {
 228                         $posts = Post::select(['event-id', 'uid'], ["`uri` = ? AND `event-id` > ?", $activity['id'], 0]);
 229                         while ($post = DBA::fetch($posts)) {
 230                                 self::updateEvent($post['event-id'], $activity);
 231                         }
 232                 }
 233         }
 234
 235         /**
 236          * Update an existing event
 237          *
 238          * @param int $event_id
 239          * @param array $activity
 240          */
 241         private static function updateEvent(int $event_id, array $activity)
 242         {
 243                 $event = DBA::selectFirst('event', [], ['id' => $event_id]);
 244
 245                 $event['edited']   = DateTimeFormat::utc($activity['updated']);
 246                 $event['summary']  = HTML::toBBCode($activity['name']);
 247                 $event['desc']     = HTML::toBBCode($activity['content']);
 248                 if (!empty($activity['start-time'])) {
 249                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
 250                 }
 251                 if (!empty($activity['end-time'])) {
 252                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
 253                 }
 254                 $event['nofinish'] = empty($event['finish']);
 255                 $event['location'] = $activity['location'];
 256
 257                 Logger::info('Updating event', ['uri' => $activity['id'], 'id' => $event_id]);
 258                 Event::store($event);
 259         }
 260
 261         /**
 262          * Prepares data for a message
 263          *
 264          * @param array      $activity   Activity array
 265          * @return array Internal item
 266          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 267          * @throws \ImagickException
 268          */
 269         public static function createItem(array $activity): array
 270         {
 271                 $item = [];
 272                 $item['verb'] = Activity::POST;
 273                 $item['thr-parent'] = $activity['reply-to-id'];
 274
 275                 if ($activity['reply-to-id'] == $activity['id']) {
 276                         $item['gravity'] = GRAVITY_PARENT;
 277                         $item['object-type'] = Activity\ObjectType::NOTE;
 278                 } else {
 279                         $item['gravity'] = GRAVITY_COMMENT;
 280                         $item['object-type'] = Activity\ObjectType::COMMENT;
 281                 }
 282
 283                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
 284                         if (Queue::hasWorker($activity)) {
 285                                 Logger::notice('There is already a worker task to dfetch the post.', ['parent' => $activity['reply-to-id']]);
 286                                 return [];
 287                         }
 288
 289                         $recursion_depth = $activity['recursion-depth'] ?? 0;
 290                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 291                         if ($recursion_depth < 10) {
 292                                 $result = self::fetchMissingActivity($activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
 293                                 $fetch_by_worker = empty($result);
 294                         } else {
 295                                 Logger::notice('Recursion level is too high.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 296                                 $fetch_by_worker = true;
 297                         }
 298
 299                         if ($fetch_by_worker) {
 300                                 Logger::notice('Fetching is done by worker.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 301                                 $activity['recursion-depth'] = 0;
 302                                 $wid = Worker::add(PRIORITY_HIGH, 'FetchMissingActivity', $activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
 303                                 Queue::setWorkerId($activity, $wid);
 304                                 return [];
 305                         }
 306                 }
 307
 308                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 309
 310                 /// @todo What to do with $activity['context']?
 311                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
 312                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 313                         return [];
 314                 }
 315
 316                 $item['network'] = Protocol::ACTIVITYPUB;
 317                 $item['author-link'] = $activity['author'];
 318                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 319                 $item['owner-link'] = $activity['actor'];
 320                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 321
 322                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 323                         $item['private'] = Item::UNLISTED;
 324                 } elseif (in_array(0, $activity['receiver'])) {
 325                         $item['private'] = Item::PUBLIC;
 326                 } else {
 327                         $item['private'] = Item::PRIVATE;
 328                 }
 329
 330                 if (!empty($activity['raw'])) {
 331                         $item['source'] = $activity['raw'];
 332                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 333                         $item['conversation-href'] = $activity['context'] ?? '';
 334                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 335
 336                         if (isset($activity['push'])) {
 337                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 338                         }
 339                 }
 340
 341                 if (!empty($activity['from-relay'])) {
 342                         $item['direction'] = Conversation::RELAY;
 343                 }
 344
 345                 if ($activity['object_type'] == 'as:Article') {
 346                         $item['post-type'] = Item::PT_ARTICLE;
 347                 } elseif ($activity['object_type'] == 'as:Audio') {
 348                         $item['post-type'] = Item::PT_AUDIO;
 349                 } elseif ($activity['object_type'] == 'as:Document') {
 350                         $item['post-type'] = Item::PT_DOCUMENT;
 351                 } elseif ($activity['object_type'] == 'as:Event') {
 352                         $item['post-type'] = Item::PT_EVENT;
 353                 } elseif ($activity['object_type'] == 'as:Image') {
 354                         $item['post-type'] = Item::PT_IMAGE;
 355                 } elseif ($activity['object_type'] == 'as:Page') {
 356                         $item['post-type'] = Item::PT_PAGE;
 357                 } elseif ($activity['object_type'] == 'as:Question') {
 358                         $item['post-type'] = Item::PT_POLL;
 359                 } elseif ($activity['object_type'] == 'as:Video') {
 360                         $item['post-type'] = Item::PT_VIDEO;
 361                 } else {
 362                         $item['post-type'] = Item::PT_NOTE;
 363                 }
 364
 365                 $item['isForum'] = false;
 366
 367                 if (!empty($activity['thread-completion'])) {
 368                         if ($activity['thread-completion'] != $item['owner-id']) {
 369                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
 370                                 $item['causer-link'] = $actor['url'];
 371                                 $item['causer-id'] = $activity['thread-completion'];
 372                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
 373                         } else {
 374                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 375                                 $item['causer-link'] = $item['owner-link'];
 376                                 $item['causer-id']   = $item['owner-id'];
 377                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
 378                         }
 379
 380                         $item['owner-link'] = $item['author-link'];
 381                         $item['owner-id'] = $item['author-id'];
 382                 } else {
 383                         $actor = APContact::getByURL($item['owner-link'], false);
 384                         $item['isForum'] = ($actor['type'] == 'Group');
 385                 }
 386
 387                 $item['uri'] = $activity['id'];
 388
 389                 if (empty($activity['published']) || empty($activity['updated'])) {
 390                         DI::logger()->notice('published or updated keys are empty for activity', ['activity' => $activity, 'callstack' => System::callstack(10)]);
 391                 }
 392
 393                 $item['created'] = DateTimeFormat::utc($activity['published'] ?? 'now');
 394                 $item['edited'] = DateTimeFormat::utc($activity['updated'] ?? 'now');
 395                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 396                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 397
 398                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 399                 if (empty($item['uri-id'])) {
 400                         Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
 401                         return [];
 402                 }
 403
 404                 $item = self::processContent($activity, $item);
 405                 if (empty($item)) {
 406                         Logger::info('Message was not processed');
 407                         return [];
 408                 }
 409
 410                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 411
 412                 self::storeAttachments($activity, $item);
 413                 self::storeQuestion($activity, $item);
 414
 415                 // We received the post via AP, so we set the protocol of the server to AP
 416                 $contact = Contact::getById($item['author-id'], ['gsid']);
 417                 if (!empty($contact['gsid'])) {
 418                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 419                 }
 420
 421                 if ($item['author-id'] != $item['owner-id']) {
 422                         $contact = Contact::getById($item['owner-id'], ['gsid']);
 423                         if (!empty($contact['gsid'])) {
 424                                 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 425                         }
 426                 }
 427
 428                 return $item;
 429         }
 430
 431         /**
 432          * Delete items
 433          *
 434          * @param array $activity
 435          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 436          * @throws \ImagickException
 437          */
 438         public static function deleteItem(array $activity)
 439         {
 440                 $owner = Contact::getIdForURL($activity['actor']);
 441
 442                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 443                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 444                 Queue::remove($activity);
 445         }
 446
 447         /**
 448          * Prepare the item array for an activity
 449          *
 450          * @param array $activity Activity array
 451          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 452          * @throws \ImagickException
 453          */
 454         public static function addTag(array $activity)
 455         {
 456                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 457                         return;
 458                 }
 459
 460                 foreach ($activity['receiver'] as $receiver) {
 461                         $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 462                         if (!DBA::isResult($item)) {
 463                                 // We don't fetch missing content for this purpose
 464                                 continue;
 465                         }
 466
 467                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 468                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 469                                 continue;
 470                         }
 471
 472                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 473                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 474                 }
 475         }
 476
 477         /**
 478          * Prepare the item array for an activity
 479          *
 480          * @param array      $activity   Activity array
 481          * @param string     $verb       Activity verb
 482          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 483          * @throws \ImagickException
 484          */
 485         public static function createActivity(array $activity, string $verb)
 486         {
 487                 $item = self::createItem($activity);
 488                 if (empty($item)) {
 489                         return;
 490                 }
 491
 492                 $item['verb'] = $verb;
 493                 $item['thr-parent'] = $activity['object_id'];
 494                 $item['gravity'] = GRAVITY_ACTIVITY;
 495                 unset($item['post-type']);
 496                 $item['object-type'] = Activity\ObjectType::NOTE;
 497
 498                 if (!empty($activity['content'])) {
 499                         $item['body'] = HTML::toBBCode($activity['content']);
 500                 }
 501
 502                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 503
 504                 self::postItem($activity, $item);
 505         }
 506
 507         /**
 508          * Fetch the Uri-Id of a post for the "featured" collection
 509          *
 510          * @param array $activity
 511          * @return null|int
 512          */
 513         private static function getUriIdForFeaturedCollection(array $activity)
 514         {
 515                 $actor = APContact::getByURL($activity['actor']);
 516                 if (empty($actor)) {
 517                         return null;
 518                 }
 519
 520                 // Refetch the account when the "featured" collection is missing.
 521                 // This can be removed in a future version (end of 2022 should be good).
 522                 if (empty($actor['featured'])) {
 523                         $actor = APContact::getByURL($activity['actor'], true);
 524                         if (empty($actor)) {
 525                                 return null;
 526                         }
 527                 }
 528
 529                 if ($activity['target_id'] != $actor['featured']) {
 530                         return null;
 531                 }
 532
 533                 $id = Contact::getIdForURL($activity['actor']);
 534                 if (empty($id)) {
 535                         return null;
 536                 }
 537
 538                 $parent = Post::selectFirst(['uri-id'], ['uri' => $activity['object_id'], 'author-id' => $id]);
 539                 if (!empty($parent['uri-id'])) {
 540                         return $parent['uri-id'];
 541                 }
 542
 543                 return null;
 544         }
 545
 546         /**
 547          * Add a post to the "Featured" collection
 548          *
 549          * @param array $activity
 550          */
 551         public static function addToFeaturedCollection(array $activity)
 552         {
 553                 $uriid = self::getUriIdForFeaturedCollection($activity);
 554                 if (empty($uriid)) {
 555                         return;
 556                 }
 557
 558                 Logger::debug('Add post to featured collection', ['uri-id' => $uriid]);
 559
 560                 Post\Collection::add($uriid, Post\Collection::FEATURED);
 561                 Queue::remove($activity);
 562         }
 563
 564         /**
 565          * Remove a post to the "Featured" collection
 566          *
 567          * @param array $activity
 568          */
 569         public static function removeFromFeaturedCollection(array $activity)
 570         {
 571                 $uriid = self::getUriIdForFeaturedCollection($activity);
 572                 if (empty($uriid)) {
 573                         return;
 574                 }
 575
 576                 Logger::debug('Remove post from featured collection', ['uri-id' => $uriid]);
 577
 578                 Post\Collection::remove($uriid, Post\Collection::FEATURED);
 579                 Queue::remove($activity);
 580         }
 581
 582         /**
 583          * Create an event
 584          *
 585          * @param array $activity Activity array
 586          * @param array $item
 587          *
 588          * @return int event id
 589          * @throws \Exception
 590          */
 591         public static function createEvent(array $activity, array $item): int
 592         {
 593                 $event['summary']   = HTML::toBBCode($activity['name'] ?: $activity['summary']);
 594                 $event['desc']      = HTML::toBBCode($activity['content']);
 595                 if (!empty($activity['start-time'])) {
 596                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
 597                 }
 598                 if (!empty($activity['end-time'])) {
 599                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
 600                 }
 601                 $event['nofinish']  = empty($event['finish']);
 602                 $event['location']  = $activity['location'];
 603                 $event['cid']       = $item['contact-id'];
 604                 $event['uid']       = $item['uid'];
 605                 $event['uri']       = $item['uri'];
 606                 $event['edited']    = $item['edited'];
 607                 $event['private']   = $item['private'];
 608                 $event['guid']      = $item['guid'];
 609                 $event['plink']     = $item['plink'];
 610                 $event['network']   = $item['network'];
 611                 $event['protocol']  = $item['protocol'];
 612                 $event['direction'] = $item['direction'];
 613                 $event['source']    = $item['source'];
 614
 615                 $ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
 616                 if (DBA::isResult($ev)) {
 617                         $event['id'] = $ev['id'];
 618                 }
 619
 620                 $event_id = Event::store($event);
 621
 622                 Logger::info('Event was stored', ['id' => $event_id]);
 623
 624                 return $event_id;
 625         }
 626
 627         /**
 628          * Process the content
 629          *
 630          * @param array $activity Activity array
 631          * @param array $item
 632          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 633          * @throws \Exception
 634          */
 635         private static function processContent(array $activity, array $item)
 636         {
 637                 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
 638                         $item['title'] = strip_tags($activity['name']);
 639                         $content = Markdown::toBBCode($activity['content']);
 640                 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
 641                         $item['title'] = $activity['name'];
 642                         $content = $activity['content'];
 643                 } else {
 644                         // By default assume "text/html"
 645                         $item['title'] = HTML::toBBCode($activity['name'] ?? '');
 646                         $content = HTML::toBBCode($activity['content'] ?? '');
 647                 }
 648
 649                 $item['title'] = trim(BBCode::toPlaintext($item['title']));
 650
 651                 if (!empty($activity['languages'])) {
 652                         $item['language'] = self::processLanguages($activity['languages']);
 653                 }
 654
 655                 if (!empty($activity['emojis'])) {
 656                         $content = self::replaceEmojis($item['uri-id'], $content, $activity['emojis']);
 657                 }
 658
 659                 $content = self::addMentionLinks($content, $activity['tags']);
 660
 661                 if (!empty($activity['source'])) {
 662                         $item['body'] = $activity['source'];
 663                         $item['raw-body'] = $content;
 664                         $item['body'] = Item::improveSharedDataInBody($item);
 665                 } else {
 666                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 667                                 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 668                                 if (!DBA::isResult($parent)) {
 669                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 670                                         return false;
 671                                 }
 672                                 if (($parent['private'] == Item::PRIVATE) && ($parent['private'] != Item::PRIVATE)) {
 673                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 674                                         return false;
 675                                 }
 676
 677                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 678                         }
 679                         $item['content-warning'] = HTML::toBBCode($activity['summary'] ?? '');
 680                         $item['raw-body'] = $item['body'] = $content;
 681                 }
 682
 683                 self::storeFromBody($item);
 684                 self::storeTags($item['uri-id'], $activity['tags']);
 685
 686                 self::storeReceivers($item['uri-id'], $activity['receiver_urls'] ?? []);
 687
 688                 $item['location'] = $activity['location'];
 689
 690                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 691                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 692                 }
 693
 694                 $item['app'] = $activity['generator'];
 695
 696                 return $item;
 697         }
 698
 699         /**
 700          * Store hashtags and mentions
 701          *
 702          * @param array $item
 703          */
 704         private static function storeFromBody(array $item)
 705         {
 706                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 707                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 708
 709                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 710         }
 711
 712         /**
 713          * Generate a GUID out of an URL of an ActivityPub post.
 714          *
 715          * @param string $url message URL
 716          * @return string with GUID
 717          */
 718         private static function getGUIDByURL(string $url): string
 719         {
 720                 $parsed = parse_url($url);
 721
 722                 $host_hash = hash('crc32', $parsed['host']);
 723
 724                 unset($parsed["scheme"]);
 725                 unset($parsed["host"]);
 726
 727                 $path = implode("/", $parsed);
 728
 729                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 730         }
 731
 732         /**
 733          * Checks if an incoming message is wanted
 734          *
 735          * @param array $activity
 736          * @param array $item
 737          * @return boolean Is the message wanted?
 738          */
 739         private static function isSolicitedMessage(array $activity, array $item): bool
 740         {
 741                 // The checks are split to improve the support when searching why a message was accepted.
 742                 if (count($activity['receiver']) != 1) {
 743                         // The message has more than one receiver, so it is wanted.
 744                         Logger::debug('Message has got several receivers - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 745                         return true;
 746                 }
 747
 748                 if ($item['private'] == Item::PRIVATE) {
 749                         // We only look at public posts here. Private posts are expected to be intentionally posted to the single receiver.
 750                         Logger::debug('Message is private - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 751                         return true;
 752                 }
 753
 754                 if (!empty($activity['from-relay'])) {
 755                         // We check relay posts at another place. When it arrived here, the message is already checked.
 756                         Logger::debug('Message is a relay post that is already checked - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 757                         return true;
 758                 }
 759
 760                 if (in_array($activity['completion-mode'] ?? Receiver::COMPLETION_NONE, [Receiver::COMPLETION_MANUAL, Receiver::COMPLETION_ANNOUCE])) {
 761                         // Manual completions and completions caused by reshares are allowed without any further checks.
 762                         Logger::debug('Message is in completion mode - accepted', ['mode' => $activity['completion-mode'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 763                         return true;
 764                 }
 765
 766                 if ($item['gravity'] != GRAVITY_PARENT) {
 767                         // We cannot reliably check at this point if a comment or activity belongs to an accepted post or needs to be fetched
 768                         // This can possibly be improved in the future.
 769                         Logger::debug('Message is no parent - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 770                         return true;
 771                 }
 772
 773                 $tags = array_column(Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]), 'name');
 774                 if (Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB)) {
 775                         Logger::debug('Post is accepted because of the relay settings', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 776                         return true;
 777                 } else {
 778                         return false;
 779                 }
 780         }
 781
 782         /**
 783          * Creates an item post
 784          *
 785          * @param array $activity Activity data
 786          * @param array $item     item array
 787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 788          * @throws \ImagickException
 789          */
 790         public static function postItem(array $activity, array $item)
 791         {
 792                 if (empty($item)) {
 793                         return;
 794                 }
 795
 796                 $stored = false;
 797                 $success = false;
 798                 ksort($activity['receiver']);
 799
 800                 if (!self::isSolicitedMessage($activity, $item)) {
 801                         DBA::delete('item-uri', ['id' => $item['uri-id']]);
 802                         return;
 803                 }
 804
 805                 foreach ($activity['receiver'] as $receiver) {
 806                         if ($receiver == -1) {
 807                                 continue;
 808                         }
 809
 810                         $item['uid'] = $receiver;
 811
 812                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 813                         switch($type) {
 814                                 case Receiver::TARGET_TO:
 815                                         $item['post-reason'] = Item::PR_TO;
 816                                         break;
 817                                 case Receiver::TARGET_CC:
 818                                         $item['post-reason'] = Item::PR_CC;
 819                                         break;
 820                                 case Receiver::TARGET_BTO:
 821                                         $item['post-reason'] = Item::PR_BTO;
 822                                         break;
 823                                 case Receiver::TARGET_BCC:
 824                                         $item['post-reason'] = Item::PR_BCC;
 825                                         break;
 826                                 case Receiver::TARGET_FOLLOWER:
 827                                         $item['post-reason'] = Item::PR_FOLLOWER;
 828                                         break;
 829                                 case Receiver::TARGET_ANSWER:
 830                                         $item['post-reason'] = Item::PR_COMMENT;
 831                                         break;
 832                                 case Receiver::TARGET_GLOBAL:
 833                                         $item['post-reason'] = Item::PR_GLOBAL;
 834                                         break;
 835                                 default:
 836                                         $item['post-reason'] = Item::PR_NONE;
 837                         }
 838
 839                         if (!empty($activity['from-relay'])) {
 840                                 $item['post-reason'] = Item::PR_RELAY;
 841                         } elseif (!empty($activity['thread-completion'])) {
 842                                 $item['post-reason'] = Item::PR_FETCHED;
 843                         }
 844
 845                         if ($item['isForum'] ?? false) {
 846                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 847                         } else {
 848                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 849                         }
 850
 851                         if (($receiver != 0) && empty($item['contact-id'])) {
 852                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 853                         }
 854
 855                         if (!empty($activity['directmessage'])) {
 856                                 self::postMail($activity, $item);
 857                                 continue;
 858                         }
 859
 860                         if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) && !Contact::isSharingByURL($activity['author'], $receiver)) {
 861                                 if ($item['post-reason'] == Item::PR_BCC) {
 862                                         Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
 863                                         continue;
 864                                 }
 865
 866                                 if (
 867                                         !empty($activity['thread-children-type'])
 868                                         && in_array($activity['thread-children-type'], Receiver::ACTIVITY_TYPES)
 869                                         && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE
 870                                 ) {
 871                                         Logger::info('Top level post from thread completion from a non sharer had been initiated via an activity, ignoring',
 872                                                 ['type' => $activity['thread-children-type'], 'user' => $item['uid'], 'causer' => $item['causer-link'], 'author' => $activity['author'], 'url' => $item['uri']]);
 873                                         continue;
 874                                 }
 875                         }
 876
 877                         $is_forum = false;
 878
 879                         if ($receiver != 0) {
 880                                 $user = User::getById($receiver, ['account-type']);
 881                                 if (!empty($user['account-type'])) {
 882                                         $is_forum = ($user['account-type'] == User::ACCOUNT_TYPE_COMMUNITY);
 883                                 }
 884                         }
 885
 886                         if (!$is_forum && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') == Item::COMPLETION_NONE && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 887                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 888
 889                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 890                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 891                                 }
 892
 893                                 if ($skip) {
 894                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 895                                         continue;
 896                                 }
 897
 898                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 899                         }
 900
 901                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 902                                 $event_id = self::createEvent($activity, $item);
 903
 904                                 $item = Event::getItemArrayForImportedId($event_id, $item);
 905                         }
 906
 907                         $item_id = Item::insert($item);
 908                         if ($item_id) {
 909                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 910                                 $success = true;
 911                         } else {
 912                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 913                         }
 914
 915                         if ($item['uid'] == 0) {
 916                                 $stored = $item_id;
 917                         }
 918                 }
 919
 920                 if ($success) {
 921                         Queue::remove($activity);
 922                         Queue::processReplyByUri($item['uri']);
 923                 }
 924
 925                 // Store send a follow request for every reshare - but only when the item had been stored
 926                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && !empty($item['author-link']) && ($item['author-link'] != $item['owner-link'])) {
 927                         $author = APContact::getByURL($item['owner-link'], false);
 928                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 929                         if ($author['type'] != 'Group') {
 930                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 931                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 932                         }
 933                 }
 934         }
 935
 936         /**
 937          * Store tags and mentions into the tag table
 938          *
 939          * @param integer $uriid
 940          * @param array $tags
 941          */
 942         private static function storeTags(int $uriid, array $tags = null)
 943         {
 944                 foreach ($tags as $tag) {
 945                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 946                                 continue;
 947                         }
 948
 949                         $hash = substr($tag['name'], 0, 1);
 950
 951                         if ($tag['type'] == 'Mention') {
 952                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 953                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 954                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 955                                         $tag['name'] = substr($tag['name'], 1);
 956                                 }
 957                                 $type = Tag::IMPLICIT_MENTION;
 958
 959                                 if (!empty($tag['href'])) {
 960                                         $apcontact = APContact::getByURL($tag['href']);
 961                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 962                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 963                                         }
 964                                 }
 965                         } elseif ($tag['type'] == 'Hashtag') {
 966                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 967                                         $tag['name'] = substr($tag['name'], 1);
 968                                 }
 969                                 $type = Tag::HASHTAG;
 970                         }
 971
 972                         if (empty($tag['name'])) {
 973                                 continue;
 974                         }
 975
 976                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 977                 }
 978         }
 979
 980         public static function storeReceivers(int $uriid, array $receivers)
 981         {
 982                 foreach (['as:to' => Tag::TO, 'as:cc' => Tag::CC, 'as:bto' => Tag::BTO, 'as:bcc' => Tag::BCC] as $element => $type) {
 983                         if (!empty($receivers[$element])) {
 984                                 foreach ($receivers[$element] as $receiver) {
 985                                         if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
 986                                                 $name = Receiver::PUBLIC_COLLECTION;
 987                                         } else {
 988                                                 $name = trim(parse_url($receiver, PHP_URL_PATH), '/');
 989                                         }
 990
 991                                         $target = Tag::getTargetType($receiver);
 992                                         Logger::debug('Got target type', ['type' => $target, 'url' => $receiver]);
 993                                         Tag::store($uriid, $type, $name, $receiver, $target);
 994                                 }
 995                         }
 996                 }
 997         }
 998
 999         /**
1000          * Creates an mail post
1001          *
1002          * @param array $activity Activity data
1003          * @param array $item     item array
1004          * @return int|bool New mail table row id or false on error
1005          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1006          */
1007         private static function postMail(array $activity, array $item)
1008         {
1009                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
1010                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
1011                         return false;
1012                 }
1013
1014                 Logger::info('Direct Message', $item);
1015
1016                 $msg = [];
1017                 $msg['uid'] = $item['uid'];
1018
1019                 $msg['contact-id'] = $item['contact-id'];
1020
1021                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
1022                 $msg['from-name'] = $contact['name'];
1023                 $msg['from-url'] = $contact['url'];
1024                 $msg['from-photo'] = $contact['photo'];
1025
1026                 $msg['uri'] = $item['uri'];
1027                 $msg['created'] = $item['created'];
1028
1029                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
1030                 if (DBA::isResult($parent)) {
1031                         $msg['parent-uri'] = $parent['parent-uri'];
1032                         $msg['title'] = $parent['title'];
1033                 } else {
1034                         $msg['parent-uri'] = $item['thr-parent'];
1035
1036                         if (!empty($item['title'])) {
1037                                 $msg['title'] = $item['title'];
1038                         } elseif (!empty($item['content-warning'])) {
1039                                 $msg['title'] = $item['content-warning'];
1040                         } else {
1041                                 // Trying to generate a title out of the body
1042                                 $title = $item['body'];
1043
1044                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
1045                                         $title = $matches[3];
1046                                 }
1047
1048                                 $title = trim(BBCode::toPlaintext($title));
1049
1050                                 if (strlen($title) > 20) {
1051                                         $title = substr($title, 0, 20) . '...';
1052                                 }
1053
1054                                 $msg['title'] = $title;
1055                         }
1056                 }
1057                 $msg['body'] = $item['body'];
1058
1059                 return Mail::insert($msg);
1060         }
1061
1062         /**
1063          * Fetch featured posts from a contact with the given url
1064          *
1065          * @param string $url
1066          * @return void
1067          */
1068         public static function fetchFeaturedPosts(string $url)
1069         {
1070                 Logger::info('Fetch featured posts', ['contact' => $url]);
1071
1072                 $apcontact = APContact::getByURL($url);
1073                 if (empty($apcontact['featured'])) {
1074                         Logger::info('Contact does not have a featured collection', ['contact' => $url]);
1075                         return;
1076                 }
1077
1078                 $pcid = Contact::getIdForURL($url, 0, false);
1079                 if (empty($pcid)) {
1080                         Logger::info('Contact not found', ['contact' => $url]);
1081                         return;
1082                 }
1083
1084                 $posts = Post\Collection::selectToArrayForContact($pcid, Post\Collection::FEATURED);
1085                 if (!empty($posts)) {
1086                         $old_featured = array_column($posts, 'uri-id');
1087                 } else {
1088                         $old_featured = [];
1089                 }
1090
1091                 $featured = ActivityPub::fetchItems($apcontact['featured']);
1092                 if (empty($featured)) {
1093                         Logger::info('Contact does not have featured posts', ['contact' => $url]);
1094
1095                         foreach ($old_featured as $uri_id) {
1096                                 Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1097                                 Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1098                         }
1099                         return;
1100                 }
1101
1102                 $new = 0;
1103                 $old = 0;
1104
1105                 foreach ($featured as $post) {
1106                         if (empty($post['id'])) {
1107                                 continue;
1108                         }
1109                         $id = Item::fetchByLink($post['id']);
1110                         if (!empty($id)) {
1111                                 $item = Post::selectFirst(['uri-id', 'featured'], ['id' => $id]);
1112                                 if (!empty($item['uri-id'])) {
1113                                         if (!$item['featured']) {
1114                                                 Post\Collection::add($item['uri-id'], Post\Collection::FEATURED);
1115                                                 Logger::debug('Added featured post', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1116                                                 $new++;
1117                                         } else {
1118                                                 Logger::debug('Post already had been featured', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1119                                                 $old++;
1120                                         }
1121
1122                                         $index = array_search($item['uri-id'], $old_featured);
1123                                         if (!($index === false)) {
1124                                                 unset($old_featured[$index]);
1125                                         }
1126                                 }
1127                         }
1128                 }
1129
1130                 foreach ($old_featured as $uri_id) {
1131                         Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1132                         Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1133                 }
1134
1135                 Logger::info('Fetched featured posts', ['new' => $new, 'old' => $old, 'contact' => $url]);
1136         }
1137
1138         /**
1139          * Fetches missing posts
1140          *
1141          * @param string     $url         message URL
1142          * @param array      $child       activity array with the child of this message
1143          * @param string     $relay_actor Relay actor
1144          * @param int        $completion  Completion mode, see Receiver::COMPLETION_*
1145          * @return string fetched message URL
1146          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1147          * @throws \ImagickException
1148          */
1149         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '', int $completion = Receiver::COMPLETION_MANUAL): string
1150         {
1151                 if (!empty($child['receiver'])) {
1152                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
1153                 } else {
1154                         $uid = 0;
1155                 }
1156
1157                 $object = ActivityPub::fetchContent($url, $uid);
1158                 if (empty($object)) {
1159                         Logger::notice('Activity was not fetchable, aborting.', ['url' => $url, 'uid' => $uid]);
1160                         return '';
1161                 }
1162
1163                 if (empty($object['id'])) {
1164                         Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
1165                         return '';
1166                 }
1167
1168                 if (!empty($object['actor'])) {
1169                         $object_actor = $object['actor'];
1170                 } elseif (!empty($object['attributedTo'])) {
1171                         $object_actor = $object['attributedTo'];
1172                         if (is_array($object_actor)) {
1173                                 $compacted = JsonLD::compact($object);
1174                                 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
1175                         }
1176                 } else {
1177                         // Shouldn't happen
1178                         $object_actor = '';
1179                 }
1180
1181                 $signer = [$object_actor];
1182
1183                 if (!empty($child['author'])) {
1184                         $actor = $child['author'];
1185                         $signer[] = $actor;
1186                 } else {
1187                         $actor = $object_actor;
1188                 }
1189
1190                 if (!empty($object['published'])) {
1191                         $published = $object['published'];
1192                 } elseif (!empty($child['published'])) {
1193                         $published = $child['published'];
1194                 } else {
1195                         $published = DateTimeFormat::utcNow();
1196                 }
1197
1198                 $activity = [];
1199                 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
1200                 unset($object['@context']);
1201                 $activity['id'] = $object['id'];
1202                 $activity['to'] = $object['to'] ?? [];
1203                 $activity['cc'] = $object['cc'] ?? [];
1204                 $activity['actor'] = $actor;
1205                 $activity['object'] = $object;
1206                 $activity['published'] = $published;
1207                 $activity['type'] = 'Create';
1208
1209                 $ldactivity = JsonLD::compact($activity);
1210
1211                 $ldactivity['recursion-depth'] = !empty($child['recursion-depth']) ? $child['recursion-depth'] + 1 : 1;
1212
1213                 if (!empty($relay_actor)) {
1214                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
1215                         $ldactivity['completion-mode']   = Receiver::COMPLETION_RELAY;
1216                 } elseif (!empty($child['thread-completion'])) {
1217                         $ldactivity['thread-completion'] = $child['thread-completion'];
1218                         $ldactivity['completion-mode']   = $child['completion-mode'] ?? Receiver::COMPLETION_NONE;
1219                 } else {
1220                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
1221                         $ldactivity['completion-mode']   = $completion;
1222                 }
1223
1224                 if (!empty($child['type'])) {
1225                         $ldactivity['thread-children-type'] = $child['type'];
1226                 }
1227
1228                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
1229                         return '';
1230                 }
1231
1232                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
1233
1234                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
1235
1236                 return $activity['id'];
1237         }
1238
1239         /**
1240          * Test if incoming relay messages should be accepted
1241          *
1242          * @param array $activity activity array
1243          * @param string $id      object ID
1244          * @return boolean true if message is accepted
1245          */
1246         private static function acceptIncomingMessage(array $activity, string $id): bool
1247         {
1248                 if (empty($activity['as:object'])) {
1249                         Logger::info('No object field in activity - accepted', ['id' => $id]);
1250                         return true;
1251                 }
1252
1253                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
1254                 $uriid = ItemURI::getIdByURI($replyto ?? '');
1255                 if (Post::exists(['uri-id' => $uriid])) {
1256                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
1257                         return true;
1258                 }
1259
1260                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
1261                 $authorid = Contact::getIdForURL($attributed_to);
1262
1263                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value') ?? '');
1264
1265                 $messageTags = [];
1266                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
1267                 if (!empty($tags)) {
1268                         foreach ($tags as $tag) {
1269                                 if ($tag['type'] != 'Hashtag') {
1270                                         continue;
1271                                 }
1272                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
1273                         }
1274                 }
1275
1276                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
1277         }
1278
1279         /**
1280          * perform a "follow" request
1281          *
1282          * @param array $activity
1283          * @return void
1284          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1285          * @throws \ImagickException
1286          */
1287         public static function followUser(array $activity)
1288         {
1289                 $uid = User::getIdForURL($activity['object_id']);
1290                 if (empty($uid)) {
1291                         return;
1292                 }
1293
1294                 $owner = User::getOwnerDataById($uid);
1295                 if (empty($owner)) {
1296                         return;
1297                 }
1298
1299                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1300                 if (!empty($cid)) {
1301                         self::switchContact($cid);
1302                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1303                 }
1304
1305                 $item = [
1306                         'author-id' => Contact::getIdForURL($activity['actor']),
1307                         'author-link' => $activity['actor'],
1308                 ];
1309
1310                 // Ensure that the contact has got the right network type
1311                 self::switchContact($item['author-id']);
1312
1313                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
1314                 if ($result === true) {
1315                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
1316                 }
1317
1318                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1319                 if (empty($cid)) {
1320                         return;
1321                 }
1322
1323                 if ($result && DI::config()->get('system', 'transmit_pending_events') && ($owner['contact-type'] == Contact::TYPE_COMMUNITY)) {
1324                         self::transmitPendingEvents($cid, $owner['uid']);
1325                 }
1326
1327                 if (empty($contact)) {
1328                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1329                 }
1330
1331                 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1332         }
1333
1334         /**
1335          * Transmit pending events to the new follower
1336          *
1337          * @param integer $cid Contact id
1338          * @param integer $uid User id
1339          * @return void
1340          */
1341         private static function transmitPendingEvents(int $cid, int $uid)
1342         {
1343                 $account = DBA::selectFirst('account-user-view', ['ap-inbox', 'ap-sharedinbox'], ['id' => $cid]);
1344                 $inbox = $account['ap-sharedinbox'] ?: $account['ap-inbox'];
1345
1346                 $events = DBA::select('event', ['id'], ["`uid` = ? AND `start` > ? AND `type` != ?", $uid, DateTimeFormat::utcNow(), 'birthday']);
1347                 while ($event = DBA::fetch($events)) {
1348                         $post = Post::selectFirst(['id', 'uri-id', 'created'], ['event-id' => $event['id']]);
1349                         if (empty($post)) {
1350                                 continue;
1351                         }
1352                         if (DI::config()->get('system', 'bulk_delivery')) {
1353                                 Post\Delivery::add($post['uri-id'], $uid, $inbox, $post['created'], Delivery::POST, [$cid]);
1354                                 Worker::add(PRIORITY_HIGH, 'APDelivery', '', 0, $inbox, 0);
1355                         } else {
1356                                 Worker::add(PRIORITY_HIGH, 'APDelivery', Delivery::POST, $post['id'], $inbox, $uid, [$cid], $post['uri-id']);
1357                         }
1358                 }
1359         }
1360
1361         /**
1362          * Update the given profile
1363          *
1364          * @param array $activity
1365          * @throws \Exception
1366          */
1367         public static function updatePerson(array $activity)
1368         {
1369                 if (empty($activity['object_id'])) {
1370                         return;
1371                 }
1372
1373                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
1374                 Contact::updateFromProbeByURL($activity['object_id']);
1375                 Queue::remove($activity);
1376         }
1377
1378         /**
1379          * Delete the given profile
1380          *
1381          * @param array $activity
1382          * @return void
1383          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1384          */
1385         public static function deletePerson(array $activity)
1386         {
1387                 if (empty($activity['object_id']) || empty($activity['actor'])) {
1388                         Logger::info('Empty object id or actor.');
1389                         return;
1390                 }
1391
1392                 if ($activity['object_id'] != $activity['actor']) {
1393                         Logger::info('Object id does not match actor.');
1394                         return;
1395                 }
1396
1397                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
1398                 while ($contact = DBA::fetch($contacts)) {
1399                         Contact::remove($contact['id']);
1400                 }
1401                 DBA::close($contacts);
1402
1403                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
1404                 Queue::remove($activity);
1405         }
1406
1407         /**
1408          * Blocks the user by the contact
1409          *
1410          * @param array $activity
1411          * @return void
1412          * @throws \Exception
1413          */
1414         public static function blockAccount(array $activity)
1415         {
1416                 $cid = Contact::getIdForURL($activity['actor']);
1417                 if (empty($cid)) {
1418                         return;
1419                 }
1420
1421                 $uid = User::getIdForURL($activity['object_id']);
1422                 if (empty($uid)) {
1423                         return;
1424                 }
1425
1426                 Contact\User::setIsBlocked($cid, $uid, true);
1427
1428                 Logger::info('Contact blocked user', ['contact' => $cid, 'user' => $uid]);
1429         }
1430
1431         /**
1432          * Unblocks the user by the contact
1433          *
1434          * @param array $activity
1435          * @return void
1436          * @throws \Exception
1437          */
1438         public static function unblockAccount(array $activity)
1439         {
1440                 $cid = Contact::getIdForURL($activity['actor']);
1441                 if (empty($cid)) {
1442                         return;
1443                 }
1444
1445                 $uid = User::getIdForURL($activity['object_object']);
1446                 if (empty($uid)) {
1447                         return;
1448                 }
1449
1450                 Contact\User::setIsBlocked($cid, $uid, false);
1451
1452                 Logger::info('Contact unblocked user', ['contact' => $cid, 'user' => $uid]);
1453         }
1454
1455         /**
1456          * Accept a follow request
1457          *
1458          * @param array $activity
1459          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1460          * @throws \ImagickException
1461          */
1462         public static function acceptFollowUser(array $activity)
1463         {
1464                 $uid = User::getIdForURL($activity['object_actor']);
1465                 if (empty($uid)) {
1466                         return;
1467                 }
1468
1469                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1470                 if (empty($cid)) {
1471                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1472                         return;
1473                 }
1474
1475                 self::switchContact($cid);
1476
1477                 $fields = ['pending' => false];
1478
1479                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1480                 if ($contact['rel'] == Contact::FOLLOWER) {
1481                         $fields['rel'] = Contact::FRIEND;
1482                 }
1483
1484                 $condition = ['id' => $cid];
1485                 Contact::update($fields, $condition);
1486                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1487                 Queue::remove($activity);
1488         }
1489
1490         /**
1491          * Reject a follow request
1492          *
1493          * @param array $activity
1494          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1495          * @throws \ImagickException
1496          */
1497         public static function rejectFollowUser(array $activity)
1498         {
1499                 $uid = User::getIdForURL($activity['object_actor']);
1500                 if (empty($uid)) {
1501                         return;
1502                 }
1503
1504                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1505                 if (empty($cid)) {
1506                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1507                         return;
1508                 }
1509
1510                 self::switchContact($cid);
1511
1512                 $contact = Contact::getById($cid, ['rel']);
1513                 if ($contact['rel'] == Contact::SHARING) {
1514                         Contact::remove($cid);
1515                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1516                 } elseif ($contact['rel'] == Contact::FRIEND) {
1517                         Contact::update(['rel' => Contact::FOLLOWER], ['id' => $cid]);
1518                 } else {
1519                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1520                 }
1521                 Queue::remove($activity);
1522         }
1523
1524         /**
1525          * Undo activity like "like" or "dislike"
1526          *
1527          * @param array $activity
1528          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1529          * @throws \ImagickException
1530          */
1531         public static function undoActivity(array $activity)
1532         {
1533                 if (empty($activity['object_id'])) {
1534                         return;
1535                 }
1536
1537                 if (empty($activity['object_actor'])) {
1538                         return;
1539                 }
1540
1541                 $author_id = Contact::getIdForURL($activity['object_actor']);
1542                 if (empty($author_id)) {
1543                         return;
1544                 }
1545
1546                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1547                 Queue::remove($activity);
1548         }
1549
1550         /**
1551          * Activity to remove a follower
1552          *
1553          * @param array $activity
1554          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1555          * @throws \ImagickException
1556          */
1557         public static function undoFollowUser(array $activity)
1558         {
1559                 $uid = User::getIdForURL($activity['object_object']);
1560                 if (empty($uid)) {
1561                         return;
1562                 }
1563
1564                 $owner = User::getOwnerDataById($uid);
1565                 if (empty($owner)) {
1566                         return;
1567                 }
1568
1569                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1570                 if (empty($cid)) {
1571                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1572                         return;
1573                 }
1574
1575                 self::switchContact($cid);
1576
1577                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1578                 if (!DBA::isResult($contact)) {
1579                         return;
1580                 }
1581
1582                 Contact::removeFollower($contact);
1583                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1584                 Queue::remove($activity);
1585         }
1586
1587         /**
1588          * Switches a contact to AP if needed
1589          *
1590          * @param integer $cid Contact ID
1591          * @return void
1592          * @throws \Exception
1593          */
1594         private static function switchContact(int $cid)
1595         {
1596                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1597                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1598                         return;
1599                 }
1600
1601                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1602                 Contact::updateFromProbe($cid);
1603         }
1604
1605         /**
1606          * Collects implicit mentions like:
1607          * - the author of the parent item
1608          * - all the mentioned conversants in the parent item
1609          *
1610          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1611          * @return array
1612          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1613          */
1614         private static function getImplicitMentionList(array $parent): array
1615         {
1616                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1617
1618                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1619
1620                 $implicit_mentions = [];
1621                 if (empty($parent_author['url'])) {
1622                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1623                 } else {
1624                         $implicit_mentions[] = $parent_author['url'];
1625                         $implicit_mentions[] = $parent_author['nurl'];
1626                         $implicit_mentions[] = $parent_author['alias'];
1627                 }
1628
1629                 if (!empty($parent['alias'])) {
1630                         $implicit_mentions[] = $parent['alias'];
1631                 }
1632
1633                 foreach ($parent_terms as $term) {
1634                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1635                         if (!empty($contact['url'])) {
1636                                 $implicit_mentions[] = $contact['url'];
1637                                 $implicit_mentions[] = $contact['nurl'];
1638                                 $implicit_mentions[] = $contact['alias'];
1639                         }
1640                 }
1641
1642                 return $implicit_mentions;
1643         }
1644
1645         /**
1646          * Strips from the body prepended implicit mentions
1647          *
1648          * @param string $body
1649          * @param array $parent
1650          * @return string
1651          */
1652         private static function removeImplicitMentionsFromBody(string $body, array $parent): string
1653         {
1654                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1655                         return $body;
1656                 }
1657
1658                 $potential_mentions = self::getImplicitMentionList($parent);
1659
1660                 $kept_mentions = [];
1661
1662                 // Extract one prepended mention at a time from the body
1663                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1664                         if (!in_array($matches[2], $potential_mentions)) {
1665                                 $kept_mentions[] = $matches[1];
1666                         }
1667
1668                         $body = $matches[3];
1669                 }
1670
1671                 // Re-appending the kept mentions to the body after extraction
1672                 $kept_mentions[] = $body;
1673
1674                 return implode('', $kept_mentions);
1675         }
1676
1677         /**
1678          * Adds links to string mentions
1679          *
1680          * @param string $body
1681          * @param array  $tags
1682          * @return string
1683          */
1684         protected static function addMentionLinks(string $body, array $tags): string
1685         {
1686                 // This prevents links to be added again to Pleroma-style mention links
1687                 $body = self::normalizeMentionLinks($body);
1688
1689                 $body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
1690                         foreach ($tags as $tag) {
1691                                 if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1692                                         continue;
1693                                 }
1694
1695                                 $hash = substr($tag['name'], 0, 1);
1696                                 $name = substr($tag['name'], 1);
1697                                 if (!in_array($hash, Tag::TAG_CHARACTER)) {
1698                                         $hash = '';
1699                                         $name = $tag['name'];
1700                                 }
1701
1702                                 $body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
1703                         }
1704
1705                         return $body;
1706                 });
1707
1708                 return $body;
1709         }
1710 }