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