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