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\Cache\Enum\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Core\Worker;
  32 use Friendica\Database\DBA;
  33 use Friendica\DI;
  34 use Friendica\Model\APContact;
  35 use Friendica\Model\Contact;
  36 use Friendica\Model\Conversation;
  37 use Friendica\Model\Event;
  38 use Friendica\Model\GServer;
  39 use Friendica\Model\Item;
  40 use Friendica\Model\ItemURI;
  41 use Friendica\Model\Mail;
  42 use Friendica\Model\Tag;
  43 use Friendica\Model\User;
  44 use Friendica\Model\Post;
  45 use Friendica\Protocol\Activity;
  46 use Friendica\Protocol\ActivityPub;
  47 use Friendica\Protocol\Relay;
  48 use Friendica\Util\DateTimeFormat;
  49 use Friendica\Util\HTTPSignature;
  50 use Friendica\Util\JsonLD;
  51 use Friendica\Util\Network;
  52 use Friendica\Util\Strings;
  53 use Friendica\Worker\Delivery;
  54
  55 /**
  56  * ActivityPub Processor Protocol class
  57  */
  58 class Processor
  59 {
  60         const CACHEKEY_FETCH_ACTIVITY = 'processor:fetchMissingActivity:';
  61         /**
  62          * Extracts the tag character (#, @, !) from mention links
  63          *
  64          * @param string $body
  65          * @return string
  66          */
  67         protected static function normalizeMentionLinks(string $body): string
  68         {
  69                 return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
  70         }
  71
  72         /**
  73          * Convert the language array into a language JSON
  74          *
  75          * @param array $languages
  76          * @return string language JSON
  77          */
  78         private static function processLanguages(array $languages): string
  79         {
  80                 $codes = array_keys($languages);
  81                 $lang = [];
  82                 foreach ($codes as $code) {
  83                         $lang[$code] = 1;
  84                 }
  85
  86                 if (empty($lang)) {
  87                         return '';
  88                 }
  89
  90                 return json_encode($lang);
  91         }
  92         /**
  93          * Replaces emojis in the body
  94          *
  95          * @param int $uri_id
  96          * @param string $body
  97          * @param array $emojis
  98          *
  99          * @return string with replaced emojis
 100          */
 101         private static function replaceEmojis(int $uri_id, string $body, array $emojis): string
 102         {
 103                 $body = strtr($body,
 104                         array_combine(
 105                                 array_column($emojis, 'name'),
 106                                 array_map(function ($emoji) {
 107                                         return '[emoji=' . $emoji['href'] . ']' . $emoji['name'] . '[/emoji]';
 108                                 }, $emojis)
 109                         )
 110                 );
 111
 112                 // We store the emoji here to be able to avoid storing it in the media
 113                 foreach ($emojis as $emoji) {
 114                         Post\Link::getByLink($uri_id, $emoji['href']);
 115                 }
 116                 return $body;
 117         }
 118
 119         /**
 120          * Store attached media files in the post-media table
 121          *
 122          * @param int $uriid
 123          * @param array $attachment
 124          * @return void
 125          */
 126         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
 127         {
 128                 if (empty($attachment['url'])) {
 129                         return;
 130                 }
 131
 132                 $data = ['uri-id' => $uriid];
 133                 $data['type'] = Post\Media::UNKNOWN;
 134                 $data['url'] = $attachment['url'];
 135                 $data['mimetype'] = $attachment['mediaType'] ?? null;
 136                 $data['height'] = $attachment['height'] ?? null;
 137                 $data['width'] = $attachment['width'] ?? null;
 138                 $data['size'] = $attachment['size'] ?? null;
 139                 $data['preview'] = $attachment['image'] ?? null;
 140                 $data['description'] = $attachment['name'] ?? null;
 141
 142                 Post\Media::insert($data);
 143         }
 144
 145         /**
 146          * Stire attachment data
 147          *
 148          * @param array   $activity
 149          * @param array   $item
 150          */
 151         private static function storeAttachments(array $activity, array $item)
 152         {
 153                 if (empty($activity['attachments'])) {
 154                         return;
 155                 }
 156
 157                 foreach ($activity['attachments'] as $attach) {
 158                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
 159                 }
 160         }
 161
 162         /**
 163          * Store attachment data
 164          *
 165          * @param array   $activity
 166          * @param array   $item
 167          */
 168         private static function storeQuestion(array $activity, array $item)
 169         {
 170                 if (empty($activity['question'])) {
 171                         return;
 172                 }
 173                 $question = ['multiple' => $activity['question']['multiple']];
 174
 175                 if (!empty($activity['question']['voters'])) {
 176                         $question['voters'] = $activity['question']['voters'];
 177                 }
 178
 179                 if (!empty($activity['question']['end-time'])) {
 180                         $question['end-time'] = DateTimeFormat::utc($activity['question']['end-time']);
 181                 }
 182
 183                 Post\Question::update($item['uri-id'], $question);
 184
 185                 foreach ($activity['question']['options'] as $key => $option) {
 186                         $option = ['name' => $option['name'], 'replies' => $option['replies']];
 187                         Post\QuestionOption::update($item['uri-id'], $key, $option);
 188                 }
 189
 190                 Logger::debug('Storing incoming question', ['type' => $activity['type'], 'uri-id' => $item['uri-id'], 'question' => $activity['question']]);
 191         }
 192
 193         /**
 194          * Updates a message
 195          *
 196          * @param array      $activity   Activity array
 197          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 198          * @throws \ImagickException
 199          */
 200         public static function updateItem(array $activity)
 201         {
 202                 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
 203                 if (!DBA::isResult($item)) {
 204                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 205                         $item = self::createItem($activity);
 206                         if (empty($item)) {
 207                                 return;
 208                         }
 209
 210                         self::postItem($activity, $item);
 211                         return;
 212                 }
 213
 214                 $item['changed'] = DateTimeFormat::utcNow();
 215                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 216
 217                 $item = self::processContent($activity, $item);
 218                 if (empty($item)) {
 219                         return;
 220                 }
 221
 222                 self::storeAttachments($activity, $item);
 223                 self::storeQuestion($activity, $item);
 224
 225                 Post\History::add($item['uri-id'], $item);
 226                 Item::update($item, ['uri' => $activity['id']]);
 227
 228                 Queue::remove($activity);
 229
 230                 if ($activity['object_type'] == 'as:Event') {
 231                         $posts = Post::select(['event-id', 'uid'], ["`uri` = ? AND `event-id` > ?", $activity['id'], 0]);
 232                         while ($post = DBA::fetch($posts)) {
 233                                 self::updateEvent($post['event-id'], $activity);
 234                         }
 235                 }
 236         }
 237
 238         /**
 239          * Update an existing event
 240          *
 241          * @param int $event_id
 242          * @param array $activity
 243          */
 244         private static function updateEvent(int $event_id, array $activity)
 245         {
 246                 $event = DBA::selectFirst('event', [], ['id' => $event_id]);
 247
 248                 $event['edited']   = DateTimeFormat::utc($activity['updated']);
 249                 $event['summary']  = HTML::toBBCode($activity['name']);
 250                 $event['desc']     = HTML::toBBCode($activity['content']);
 251                 if (!empty($activity['start-time'])) {
 252                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
 253                 }
 254                 if (!empty($activity['end-time'])) {
 255                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
 256                 }
 257                 $event['nofinish'] = empty($event['finish']);
 258                 $event['location'] = $activity['location'];
 259
 260                 Logger::info('Updating event', ['uri' => $activity['id'], 'id' => $event_id]);
 261                 Event::store($event);
 262         }
 263
 264         /**
 265          * Prepares data for a message
 266          *
 267          * @param array      $activity   Activity array
 268          * @return array Internal item
 269          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 270          * @throws \ImagickException
 271          */
 272         public static function createItem(array $activity): array
 273         {
 274                 $item = [];
 275                 $item['verb'] = Activity::POST;
 276                 $item['thr-parent'] = $activity['reply-to-id'];
 277
 278                 if ($activity['reply-to-id'] == $activity['id']) {
 279                         $item['gravity'] = GRAVITY_PARENT;
 280                         $item['object-type'] = Activity\ObjectType::NOTE;
 281                 } else {
 282                         $item['gravity'] = GRAVITY_COMMENT;
 283                         $item['object-type'] = Activity\ObjectType::COMMENT;
 284                 }
 285
 286                 if (!empty($activity['context'])) {
 287                         $item['conversation'] = $activity['context'];
 288                 } elseif (!empty($activity['conversation'])) {
 289                         $item['conversation'] = $activity['conversation'];
 290                 }
 291
 292                 if (!empty($item['conversation'])) {
 293                         $conversation = Post::selectFirstThread(['uri'], ['conversation' => $item['conversation']]);
 294                         if (!empty($conversation)) {
 295                                 Logger::debug('Got conversation', ['conversation' => $item['conversation'], 'parent' => $conversation]);
 296                                 $item['parent-uri'] = $conversation['uri'];
 297                         }
 298                 } else {
 299                         $conversation = [];
 300                 }
 301
 302                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
 303                         $recursion_depth = $activity['recursion-depth'] ?? 0;
 304                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 305                         if ($recursion_depth < DI::config()->get('system', 'max_recursion_depth')) {
 306                                 $result = self::fetchMissingActivity($activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
 307                                 if (empty($result) && self::isActivityGone($activity['reply-to-id'])) {
 308                                         // Recursively delete this and all depending entries
 309                                         Queue::deleteById($activity['entry-id']);
 310                                         return [];
 311                                 }
 312                                 $fetch_by_worker = empty($result);
 313                         } else {
 314                                 Logger::notice('Recursion level is too high.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 315                                 $fetch_by_worker = true;
 316                         }
 317
 318                         if ($fetch_by_worker && Queue::hasWorker($activity)) {
 319                                 Logger::notice('There is already a worker task to fetch the post.', ['id' => $activity['id'], 'parent' => $activity['reply-to-id']]);
 320                                 $fetch_by_worker = false;
 321                                 if (!empty($conversation)) {
 322                                         return [];
 323                                 }
 324                         }
 325
 326                         if ($fetch_by_worker) {
 327                                 Logger::notice('Fetching is done by worker.', ['parent' => $activity['reply-to-id'], 'recursion-depth' => $recursion_depth]);
 328                                 $activity['recursion-depth'] = 0;
 329                                 $wid = Worker::add(PRIORITY_HIGH, 'FetchMissingActivity', $activity['reply-to-id'], $activity, '', Receiver::COMPLETION_AUTO);
 330                                 Queue::setWorkerId($activity, $wid);
 331                                 if (!empty($conversation)) {
 332                                         return [];
 333                                 }
 334                         } elseif (!empty($result)) {
 335                                 if (($item['thr-parent'] != $result) && Post::exists(['uri' => $result])) {
 336                                         $item['thr-parent'] = $result;
 337                                 }
 338                         }
 339                 }
 340
 341                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 342
 343                 if (empty($conversation) && empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
 344                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 345                         return [];
 346                 }
 347
 348                 $item['network'] = Protocol::ACTIVITYPUB;
 349                 $item['author-link'] = $activity['author'];
 350                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 351                 $item['owner-link'] = $activity['actor'];
 352                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 353
 354                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 355                         $item['private'] = Item::UNLISTED;
 356                 } elseif (in_array(0, $activity['receiver'])) {
 357                         $item['private'] = Item::PUBLIC;
 358                 } else {
 359                         $item['private'] = Item::PRIVATE;
 360                 }
 361
 362                 if (!empty($activity['raw'])) {
 363                         $item['source'] = $activity['raw'];
 364                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 365                 }
 366
 367                 if (isset($activity['push'])) {
 368                         $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 369                 }
 370
 371                 if (!empty($activity['from-relay'])) {
 372                         $item['direction'] = Conversation::RELAY;
 373                 }
 374
 375                 if ($activity['object_type'] == 'as:Article') {
 376                         $item['post-type'] = Item::PT_ARTICLE;
 377                 } elseif ($activity['object_type'] == 'as:Audio') {
 378                         $item['post-type'] = Item::PT_AUDIO;
 379                 } elseif ($activity['object_type'] == 'as:Document') {
 380                         $item['post-type'] = Item::PT_DOCUMENT;
 381                 } elseif ($activity['object_type'] == 'as:Event') {
 382                         $item['post-type'] = Item::PT_EVENT;
 383                 } elseif ($activity['object_type'] == 'as:Image') {
 384                         $item['post-type'] = Item::PT_IMAGE;
 385                 } elseif ($activity['object_type'] == 'as:Page') {
 386                         $item['post-type'] = Item::PT_PAGE;
 387                 } elseif ($activity['object_type'] == 'as:Question') {
 388                         $item['post-type'] = Item::PT_POLL;
 389                 } elseif ($activity['object_type'] == 'as:Video') {
 390                         $item['post-type'] = Item::PT_VIDEO;
 391                 } else {
 392                         $item['post-type'] = Item::PT_NOTE;
 393                 }
 394
 395                 $item['isForum'] = false;
 396
 397                 if (!empty($activity['thread-completion'])) {
 398                         if ($activity['thread-completion'] != $item['owner-id']) {
 399                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
 400                                 $item['causer-link'] = $actor['url'];
 401                                 $item['causer-id'] = $activity['thread-completion'];
 402                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
 403                         } else {
 404                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 405                                 $item['causer-link'] = $item['owner-link'];
 406                                 $item['causer-id']   = $item['owner-id'];
 407                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
 408                         }
 409
 410                         $item['owner-link'] = $item['author-link'];
 411                         $item['owner-id'] = $item['author-id'];
 412                 } else {
 413                         $actor = APContact::getByURL($item['owner-link'], false);
 414                         $item['isForum'] = ($actor['type'] == 'Group');
 415                 }
 416
 417                 $item['uri'] = $activity['id'];
 418
 419                 if (empty($activity['published']) || empty($activity['updated'])) {
 420                         DI::logger()->notice('published or updated keys are empty for activity', ['activity' => $activity, 'callstack' => System::callstack(10)]);
 421                 }
 422
 423                 $item['created'] = DateTimeFormat::utc($activity['published'] ?? 'now');
 424                 $item['edited'] = DateTimeFormat::utc($activity['updated'] ?? 'now');
 425                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 426                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 427
 428                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 429                 if (empty($item['uri-id'])) {
 430                         Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
 431                         return [];
 432                 }
 433
 434                 $item = self::processContent($activity, $item);
 435                 if (empty($item)) {
 436                         Logger::info('Message was not processed');
 437                         return [];
 438                 }
 439
 440                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 441
 442                 self::storeAttachments($activity, $item);
 443                 self::storeQuestion($activity, $item);
 444
 445                 // We received the post via AP, so we set the protocol of the server to AP
 446                 $contact = Contact::getById($item['author-id'], ['gsid']);
 447                 if (!empty($contact['gsid'])) {
 448                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 449                 }
 450
 451                 if ($item['author-id'] != $item['owner-id']) {
 452                         $contact = Contact::getById($item['owner-id'], ['gsid']);
 453                         if (!empty($contact['gsid'])) {
 454                                 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 455                         }
 456                 }
 457
 458                 return $item;
 459         }
 460
 461         /**
 462          * Check if a given activity is no longer available
 463          *
 464          * @param string $url
 465          *
 466          * @return boolean
 467          */
 468         public static function isActivityGone(string $url): bool
 469         {
 470                 $curlResult = HTTPSignature::fetchRaw($url, 0);
 471
 472                 if (Network::isUrlBlocked($url)) {
 473                         return true;
 474                 }
 475
 476                 // @todo To ensure that the remote system is working correctly, we can check if the "Content-Type" contains JSON
 477                 if (in_array($curlResult->getReturnCode(), [404])) {
 478                         return true;
 479                 }
 480
 481                 $object = json_decode($curlResult->getBody(), true);
 482                 if (!empty($object)) {
 483                         $activity = JsonLD::compact($object);
 484                         if (JsonLD::fetchElement($activity, '@type') == 'as:Tombstone') {
 485                                 return true;
 486                         }
 487                 }
 488
 489                 return false;
 490         }
 491         /**
 492          * Delete items
 493          *
 494          * @param array $activity
 495          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 496          * @throws \ImagickException
 497          */
 498         public static function deleteItem(array $activity)
 499         {
 500                 $owner = Contact::getIdForURL($activity['actor']);
 501
 502                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 503                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 504                 Queue::remove($activity);
 505         }
 506
 507         /**
 508          * Prepare the item array for an activity
 509          *
 510          * @param array $activity Activity array
 511          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 512          * @throws \ImagickException
 513          */
 514         public static function addTag(array $activity)
 515         {
 516                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 517                         return;
 518                 }
 519
 520                 foreach ($activity['receiver'] as $receiver) {
 521                         $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 522                         if (!DBA::isResult($item)) {
 523                                 // We don't fetch missing content for this purpose
 524                                 continue;
 525                         }
 526
 527                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 528                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 529                                 continue;
 530                         }
 531
 532                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 533                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 534                 }
 535         }
 536
 537         /**
 538          * Prepare the item array for an activity
 539          *
 540          * @param array      $activity   Activity array
 541          * @param string     $verb       Activity verb
 542          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 543          * @throws \ImagickException
 544          */
 545         public static function createActivity(array $activity, string $verb)
 546         {
 547                 $activity['reply-to-id'] = $activity['object_id'];
 548                 $item = self::createItem($activity);
 549                 if (empty($item)) {
 550                         return;
 551                 }
 552
 553                 $item['verb'] = $verb;
 554                 $item['thr-parent'] = $activity['object_id'];
 555                 $item['gravity'] = GRAVITY_ACTIVITY;
 556                 unset($item['post-type']);
 557                 $item['object-type'] = Activity\ObjectType::NOTE;
 558
 559                 if (!empty($activity['content'])) {
 560                         $item['body'] = HTML::toBBCode($activity['content']);
 561                 }
 562
 563                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 564
 565                 self::postItem($activity, $item);
 566         }
 567
 568         /**
 569          * Fetch the Uri-Id of a post for the "featured" collection
 570          *
 571          * @param array $activity
 572          * @return null|int
 573          */
 574         private static function getUriIdForFeaturedCollection(array $activity)
 575         {
 576                 $actor = APContact::getByURL($activity['actor']);
 577                 if (empty($actor)) {
 578                         return null;
 579                 }
 580
 581                 // Refetch the account when the "featured" collection is missing.
 582                 // This can be removed in a future version (end of 2022 should be good).
 583                 if (empty($actor['featured'])) {
 584                         $actor = APContact::getByURL($activity['actor'], true);
 585                         if (empty($actor)) {
 586                                 return null;
 587                         }
 588                 }
 589
 590                 $parent = Post::selectFirst(['uri-id'], ['uri' => $activity['object_id']]);
 591                 if (empty($parent['uri-id'])) {
 592                         if (self::fetchMissingActivity($activity['object_id'], $activity, '', Receiver::COMPLETION_AUTO)) {
 593                                 $parent = Post::selectFirst(['uri-id'], ['uri' => $activity['object_id']]);
 594                         }
 595                 }
 596
 597                 if (!empty($parent['uri-id'])) {
 598                         return $parent['uri-id'];
 599                 }
 600
 601                 return null;
 602         }
 603
 604         /**
 605          * Add a post to the "Featured" collection
 606          *
 607          * @param array $activity
 608          */
 609         public static function addToFeaturedCollection(array $activity)
 610         {
 611                 $uriid = self::getUriIdForFeaturedCollection($activity);
 612                 if (empty($uriid)) {
 613                         return;
 614                 }
 615
 616                 Logger::debug('Add post to featured collection', ['uri-id' => $uriid]);
 617
 618                 Post\Collection::add($uriid, Post\Collection::FEATURED);
 619                 Queue::remove($activity);
 620         }
 621
 622         /**
 623          * Remove a post to the "Featured" collection
 624          *
 625          * @param array $activity
 626          */
 627         public static function removeFromFeaturedCollection(array $activity)
 628         {
 629                 $uriid = self::getUriIdForFeaturedCollection($activity);
 630                 if (empty($uriid)) {
 631                         return;
 632                 }
 633
 634                 Logger::debug('Remove post from featured collection', ['uri-id' => $uriid]);
 635
 636                 Post\Collection::remove($uriid, Post\Collection::FEATURED);
 637                 Queue::remove($activity);
 638         }
 639
 640         /**
 641          * Create an event
 642          *
 643          * @param array $activity Activity array
 644          * @param array $item
 645          *
 646          * @return int event id
 647          * @throws \Exception
 648          */
 649         public static function createEvent(array $activity, array $item): int
 650         {
 651                 $event['summary']   = HTML::toBBCode($activity['name'] ?: $activity['summary']);
 652                 $event['desc']      = HTML::toBBCode($activity['content']);
 653                 if (!empty($activity['start-time'])) {
 654                         $event['start']  = DateTimeFormat::utc($activity['start-time']);
 655                 }
 656                 if (!empty($activity['end-time'])) {
 657                         $event['finish'] = DateTimeFormat::utc($activity['end-time']);
 658                 }
 659                 $event['nofinish']  = empty($event['finish']);
 660                 $event['location']  = $activity['location'];
 661                 $event['cid']       = $item['contact-id'];
 662                 $event['uid']       = $item['uid'];
 663                 $event['uri']       = $item['uri'];
 664                 $event['edited']    = $item['edited'];
 665                 $event['private']   = $item['private'];
 666                 $event['guid']      = $item['guid'];
 667                 $event['plink']     = $item['plink'];
 668                 $event['network']   = $item['network'];
 669                 $event['protocol']  = $item['protocol'];
 670                 $event['direction'] = $item['direction'];
 671                 $event['source']    = $item['source'];
 672
 673                 $ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
 674                 if (DBA::isResult($ev)) {
 675                         $event['id'] = $ev['id'];
 676                 }
 677
 678                 $event_id = Event::store($event);
 679
 680                 Logger::info('Event was stored', ['id' => $event_id]);
 681
 682                 return $event_id;
 683         }
 684
 685         /**
 686          * Process the content
 687          *
 688          * @param array $activity Activity array
 689          * @param array $item
 690          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 691          * @throws \Exception
 692          */
 693         private static function processContent(array $activity, array $item)
 694         {
 695                 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
 696                         $item['title'] = strip_tags($activity['name']);
 697                         $content = Markdown::toBBCode($activity['content']);
 698                 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
 699                         $item['title'] = $activity['name'];
 700                         $content = $activity['content'];
 701                 } else {
 702                         // By default assume "text/html"
 703                         $item['title'] = HTML::toBBCode($activity['name'] ?? '');
 704                         $content = HTML::toBBCode($activity['content'] ?? '');
 705                 }
 706
 707                 $item['title'] = trim(BBCode::toPlaintext($item['title']));
 708
 709                 if (!empty($activity['languages'])) {
 710                         $item['language'] = self::processLanguages($activity['languages']);
 711                 }
 712
 713                 if (!empty($activity['emojis'])) {
 714                         $content = self::replaceEmojis($item['uri-id'], $content, $activity['emojis']);
 715                 }
 716
 717                 $content = self::addMentionLinks($content, $activity['tags']);
 718
 719                 if (!empty($activity['source'])) {
 720                         $item['body'] = $activity['source'];
 721                         $item['raw-body'] = $content;
 722                         $item['body'] = Item::improveSharedDataInBody($item);
 723                 } else {
 724                         $parent_uri = $item['parent-uri'] ?? $item['thr-parent'];
 725                         if (empty($activity['directmessage']) && ($parent_uri != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 726                                 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $parent_uri]);
 727                                 if (!DBA::isResult($parent)) {
 728                                         Logger::warning('Unknown parent item.', ['uri' => $parent_uri]);
 729                                         return false;
 730                                 }
 731                                 if (($item['private'] == Item::PRIVATE) && ($parent['private'] != Item::PRIVATE)) {
 732                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 733                                         return false;
 734                                 }
 735
 736                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 737                         }
 738                         $item['content-warning'] = HTML::toBBCode($activity['summary'] ?? '');
 739                         $item['raw-body'] = $item['body'] = $content;
 740                 }
 741
 742                 self::storeFromBody($item);
 743                 self::storeTags($item['uri-id'], $activity['tags']);
 744
 745                 self::storeReceivers($item['uri-id'], $activity['receiver_urls'] ?? []);
 746
 747                 $item['location'] = $activity['location'];
 748
 749                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 750                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 751                 }
 752
 753                 $item['app'] = $activity['generator'];
 754
 755                 return $item;
 756         }
 757
 758         /**
 759          * Store hashtags and mentions
 760          *
 761          * @param array $item
 762          */
 763         private static function storeFromBody(array $item)
 764         {
 765                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 766                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 767
 768                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 769         }
 770
 771         /**
 772          * Generate a GUID out of an URL of an ActivityPub post.
 773          *
 774          * @param string $url message URL
 775          * @return string with GUID
 776          */
 777         private static function getGUIDByURL(string $url): string
 778         {
 779                 $parsed = parse_url($url);
 780
 781                 $host_hash = hash('crc32', $parsed['host']);
 782
 783                 unset($parsed["scheme"]);
 784                 unset($parsed["host"]);
 785
 786                 $path = implode("/", $parsed);
 787
 788                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 789         }
 790
 791         /**
 792          * Checks if an incoming message is wanted
 793          *
 794          * @param array $activity
 795          * @param array $item
 796          * @return boolean Is the message wanted?
 797          */
 798         private static function isSolicitedMessage(array $activity, array $item): bool
 799         {
 800                 // The checks are split to improve the support when searching why a message was accepted.
 801                 if (count($activity['receiver']) != 1) {
 802                         // The message has more than one receiver, so it is wanted.
 803                         Logger::debug('Message has got several receivers - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 804                         return true;
 805                 }
 806
 807                 if ($item['private'] == Item::PRIVATE) {
 808                         // We only look at public posts here. Private posts are expected to be intentionally posted to the single receiver.
 809                         Logger::debug('Message is private - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 810                         return true;
 811                 }
 812
 813                 if (!empty($activity['from-relay'])) {
 814                         // We check relay posts at another place. When it arrived here, the message is already checked.
 815                         Logger::debug('Message is a relay post that is already checked - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 816                         return true;
 817                 }
 818
 819                 if (in_array($activity['completion-mode'] ?? Receiver::COMPLETION_NONE, [Receiver::COMPLETION_MANUAL, Receiver::COMPLETION_ANNOUCE])) {
 820                         // Manual completions and completions caused by reshares are allowed without any further checks.
 821                         Logger::debug('Message is in completion mode - accepted', ['mode' => $activity['completion-mode'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 822                         return true;
 823                 }
 824
 825                 if ($item['gravity'] != GRAVITY_PARENT) {
 826                         // We cannot reliably check at this point if a comment or activity belongs to an accepted post or needs to be fetched
 827                         // This can possibly be improved in the future.
 828                         Logger::debug('Message is no parent - accepted', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 829                         return true;
 830                 }
 831
 832                 $tags = array_column(Tag::getByURIId($item['uri-id'], [Tag::HASHTAG]), 'name');
 833                 if (Relay::isSolicitedPost($tags, $item['body'], $item['author-id'], $item['uri'], Protocol::ACTIVITYPUB)) {
 834                         Logger::debug('Post is accepted because of the relay settings', ['uri-id' => $item['uri-id'], 'guid' => $item['guid'], 'url' => $item['uri']]);
 835                         return true;
 836                 } else {
 837                         return false;
 838                 }
 839         }
 840
 841         /**
 842          * Creates an item post
 843          *
 844          * @param array $activity Activity data
 845          * @param array $item     item array
 846          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 847          * @throws \ImagickException
 848          */
 849         public static function postItem(array $activity, array $item)
 850         {
 851                 if (empty($item)) {
 852                         return;
 853                 }
 854
 855                 $stored = false;
 856                 $success = false;
 857                 ksort($activity['receiver']);
 858
 859                 if (!self::isSolicitedMessage($activity, $item)) {
 860                         DBA::delete('item-uri', ['id' => $item['uri-id']]);
 861                         return;
 862                 }
 863
 864                 foreach ($activity['receiver'] as $receiver) {
 865                         if ($receiver == -1) {
 866                                 continue;
 867                         }
 868
 869                         $item['uid'] = $receiver;
 870
 871                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 872                         switch($type) {
 873                                 case Receiver::TARGET_TO:
 874                                         $item['post-reason'] = Item::PR_TO;
 875                                         break;
 876                                 case Receiver::TARGET_CC:
 877                                         $item['post-reason'] = Item::PR_CC;
 878                                         break;
 879                                 case Receiver::TARGET_BTO:
 880                                         $item['post-reason'] = Item::PR_BTO;
 881                                         break;
 882                                 case Receiver::TARGET_BCC:
 883                                         $item['post-reason'] = Item::PR_BCC;
 884                                         break;
 885                                 case Receiver::TARGET_FOLLOWER:
 886                                         $item['post-reason'] = Item::PR_FOLLOWER;
 887                                         break;
 888                                 case Receiver::TARGET_ANSWER:
 889                                         $item['post-reason'] = Item::PR_COMMENT;
 890                                         break;
 891                                 case Receiver::TARGET_GLOBAL:
 892                                         $item['post-reason'] = Item::PR_GLOBAL;
 893                                         break;
 894                                 default:
 895                                         $item['post-reason'] = Item::PR_NONE;
 896                         }
 897
 898                         if (!empty($activity['from-relay'])) {
 899                                 $item['post-reason'] = Item::PR_RELAY;
 900                         } elseif (!empty($activity['thread-completion'])) {
 901                                 $item['post-reason'] = Item::PR_FETCHED;
 902                         } elseif (in_array($item['post-reason'], [Item::PR_GLOBAL, Item::PR_NONE]) && !empty($activity['push'])) {
 903                                 $item['post-reason'] = Item::PR_PUSHED;
 904                         }
 905
 906                         if ($item['isForum'] ?? false) {
 907                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 908                         } else {
 909                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 910                         }
 911
 912                         if (($receiver != 0) && empty($item['contact-id'])) {
 913                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 914                         }
 915
 916                         if (!empty($activity['directmessage'])) {
 917                                 self::postMail($activity, $item);
 918                                 continue;
 919                         }
 920
 921                         if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) && !Contact::isSharingByURL($activity['author'] ?? '', $receiver)) {
 922                                 if ($item['post-reason'] == Item::PR_BCC) {
 923                                         Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
 924                                         continue;
 925                                 }
 926
 927                                 if (
 928                                         !empty($activity['thread-children-type'])
 929                                         && in_array($activity['thread-children-type'], Receiver::ACTIVITY_TYPES)
 930                                         && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') != Item::COMPLETION_LIKE
 931                                 ) {
 932                                         Logger::info('Top level post from thread completion from a non sharer had been initiated via an activity, ignoring',
 933                                                 ['type' => $activity['thread-children-type'], 'user' => $item['uid'], 'causer' => $item['causer-link'], 'author' => $activity['author'], 'url' => $item['uri']]);
 934                                         continue;
 935                                 }
 936                         }
 937
 938                         $is_forum = false;
 939
 940                         if ($receiver != 0) {
 941                                 $user = User::getById($receiver, ['account-type']);
 942                                 if (!empty($user['account-type'])) {
 943                                         $is_forum = ($user['account-type'] == User::ACCOUNT_TYPE_COMMUNITY);
 944                                 }
 945                         }
 946
 947                         if (!$is_forum && DI::pConfig()->get($receiver, 'system', 'accept_only_sharer') == Item::COMPLETION_NONE && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 948                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 949
 950                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 951                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 952                                 }
 953
 954                                 if ($skip) {
 955                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 956                                         continue;
 957                                 }
 958
 959                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 960                         }
 961
 962                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 963                                 $event_id = self::createEvent($activity, $item);
 964
 965                                 $item = Event::getItemArrayForImportedId($event_id, $item);
 966                         }
 967
 968                         $item_id = Item::insert($item);
 969                         if ($item_id) {
 970                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 971                                 $success = true;
 972                         } else {
 973                                 Logger::notice('Item insertion aborted', ['uri' => $item['uri'], 'uid' => $item['uid']]);
 974                         }
 975
 976                         if ($item['uid'] == 0) {
 977                                 $stored = $item_id;
 978                         }
 979                 }
 980
 981                 Queue::remove($activity);
 982
 983                 if ($success && Queue::hasChildren($item['uri'])) {
 984                         Worker::add(PRIORITY_HIGH, 'ProcessReplyByUri', $item['uri']);
 985                 }
 986
 987                 // Store send a follow request for every reshare - but only when the item had been stored
 988                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && !empty($item['author-link']) && ($item['author-link'] != $item['owner-link'])) {
 989                         $author = APContact::getByURL($item['owner-link'], false);
 990                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 991                         if ($author['type'] != 'Group') {
 992                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 993                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 994                         }
 995                 }
 996         }
 997
 998         /**
 999          * Store tags and mentions into the tag table
1000          *
1001          * @param integer $uriid
1002          * @param array $tags
1003          */
1004         private static function storeTags(int $uriid, array $tags = null)
1005         {
1006                 foreach ($tags as $tag) {
1007                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1008                                 continue;
1009                         }
1010
1011                         $hash = substr($tag['name'], 0, 1);
1012
1013                         if ($tag['type'] == 'Mention') {
1014                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
1015                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
1016                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
1017                                         $tag['name'] = substr($tag['name'], 1);
1018                                 }
1019                                 $type = Tag::IMPLICIT_MENTION;
1020
1021                                 if (!empty($tag['href'])) {
1022                                         $apcontact = APContact::getByURL($tag['href']);
1023                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
1024                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
1025                                         }
1026                                 }
1027                         } elseif ($tag['type'] == 'Hashtag') {
1028                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
1029                                         $tag['name'] = substr($tag['name'], 1);
1030                                 }
1031                                 $type = Tag::HASHTAG;
1032                         }
1033
1034                         if (empty($tag['name'])) {
1035                                 continue;
1036                         }
1037
1038                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
1039                 }
1040         }
1041
1042         public static function storeReceivers(int $uriid, array $receivers)
1043         {
1044                 foreach (['as:to' => Tag::TO, 'as:cc' => Tag::CC, 'as:bto' => Tag::BTO, 'as:bcc' => Tag::BCC] as $element => $type) {
1045                         if (!empty($receivers[$element])) {
1046                                 foreach ($receivers[$element] as $receiver) {
1047                                         if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
1048                                                 $name = Receiver::PUBLIC_COLLECTION;
1049                                         } else {
1050                                                 $name = trim(parse_url($receiver, PHP_URL_PATH), '/');
1051                                         }
1052
1053                                         $target = Tag::getTargetType($receiver);
1054                                         Logger::debug('Got target type', ['type' => $target, 'url' => $receiver]);
1055                                         Tag::store($uriid, $type, $name, $receiver, $target);
1056                                 }
1057                         }
1058                 }
1059         }
1060
1061         /**
1062          * Creates an mail post
1063          *
1064          * @param array $activity Activity data
1065          * @param array $item     item array
1066          * @return int|bool New mail table row id or false on error
1067          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1068          */
1069         private static function postMail(array $activity, array $item)
1070         {
1071                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
1072                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
1073                         return false;
1074                 }
1075
1076                 Logger::info('Direct Message', $item);
1077
1078                 $msg = [];
1079                 $msg['uid'] = $item['uid'];
1080
1081                 $msg['contact-id'] = $item['contact-id'];
1082
1083                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
1084                 $msg['from-name'] = $contact['name'];
1085                 $msg['from-url'] = $contact['url'];
1086                 $msg['from-photo'] = $contact['photo'];
1087
1088                 $msg['uri'] = $item['uri'];
1089                 $msg['created'] = $item['created'];
1090
1091                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
1092                 if (DBA::isResult($parent)) {
1093                         $msg['parent-uri'] = $parent['parent-uri'];
1094                         $msg['title'] = $parent['title'];
1095                 } else {
1096                         $msg['parent-uri'] = $item['thr-parent'];
1097
1098                         if (!empty($item['title'])) {
1099                                 $msg['title'] = $item['title'];
1100                         } elseif (!empty($item['content-warning'])) {
1101                                 $msg['title'] = $item['content-warning'];
1102                         } else {
1103                                 // Trying to generate a title out of the body
1104                                 $title = $item['body'];
1105
1106                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
1107                                         $title = $matches[3];
1108                                 }
1109
1110                                 $title = trim(BBCode::toPlaintext($title));
1111
1112                                 if (strlen($title) > 20) {
1113                                         $title = substr($title, 0, 20) . '...';
1114                                 }
1115
1116                                 $msg['title'] = $title;
1117                         }
1118                 }
1119                 $msg['body'] = $item['body'];
1120
1121                 return Mail::insert($msg);
1122         }
1123
1124         /**
1125          * Fetch featured posts from a contact with the given url
1126          *
1127          * @param string $url
1128          * @return void
1129          */
1130         public static function fetchFeaturedPosts(string $url)
1131         {
1132                 Logger::info('Fetch featured posts', ['contact' => $url]);
1133
1134                 $apcontact = APContact::getByURL($url);
1135                 if (empty($apcontact['featured'])) {
1136                         Logger::info('Contact does not have a featured collection', ['contact' => $url]);
1137                         return;
1138                 }
1139
1140                 $pcid = Contact::getIdForURL($url, 0, false);
1141                 if (empty($pcid)) {
1142                         Logger::info('Contact not found', ['contact' => $url]);
1143                         return;
1144                 }
1145
1146                 $posts = Post\Collection::selectToArrayForContact($pcid, Post\Collection::FEATURED);
1147                 if (!empty($posts)) {
1148                         $old_featured = array_column($posts, 'uri-id');
1149                 } else {
1150                         $old_featured = [];
1151                 }
1152
1153                 $featured = ActivityPub::fetchItems($apcontact['featured']);
1154                 if (empty($featured)) {
1155                         Logger::info('Contact does not have featured posts', ['contact' => $url]);
1156
1157                         foreach ($old_featured as $uri_id) {
1158                                 Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1159                                 Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1160                         }
1161                         return;
1162                 }
1163
1164                 $new = 0;
1165                 $old = 0;
1166
1167                 foreach ($featured as $post) {
1168                         if (empty($post['id'])) {
1169                                 continue;
1170                         }
1171                         $id = Item::fetchByLink($post['id']);
1172                         if (!empty($id)) {
1173                                 $item = Post::selectFirst(['uri-id', 'featured'], ['id' => $id]);
1174                                 if (!empty($item['uri-id'])) {
1175                                         if (!$item['featured']) {
1176                                                 Post\Collection::add($item['uri-id'], Post\Collection::FEATURED);
1177                                                 Logger::debug('Added featured post', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1178                                                 $new++;
1179                                         } else {
1180                                                 Logger::debug('Post already had been featured', ['uri-id' => $item['uri-id'], 'contact' => $url]);
1181                                                 $old++;
1182                                         }
1183
1184                                         $index = array_search($item['uri-id'], $old_featured);
1185                                         if (!($index === false)) {
1186                                                 unset($old_featured[$index]);
1187                                         }
1188                                 }
1189                         }
1190                 }
1191
1192                 foreach ($old_featured as $uri_id) {
1193                         Post\Collection::remove($uri_id, Post\Collection::FEATURED);
1194                         Logger::debug('Removed no longer featured post', ['uri-id' => $uri_id, 'contact' => $url]);
1195                 }
1196
1197                 Logger::info('Fetched featured posts', ['new' => $new, 'old' => $old, 'contact' => $url]);
1198         }
1199
1200         public static function fetchCachedActivity(string $url, int $uid): array
1201         {
1202                 $cachekey = self::CACHEKEY_FETCH_ACTIVITY . $uid . ':' . $url;
1203                 $object = DI::cache()->get($cachekey);
1204
1205                 if (!is_null($object)) {
1206                         if (!empty($object)) {
1207                                 Logger::debug('Fetch from cache', ['url' => $url, 'uid' => $uid]);
1208                         } else {
1209                                 Logger::debug('Fetch from negative cache', ['url' => $url, 'uid' => $uid]);
1210                         }
1211                         return $object;
1212                 }
1213
1214                 $object = ActivityPub::fetchContent($url, $uid);
1215                 if (empty($object)) {
1216                         Logger::notice('Activity was not fetchable, aborting.', ['url' => $url, 'uid' => $uid]);
1217                         // We perform negative caching.
1218                         DI::cache()->set($cachekey, [], Duration::FIVE_MINUTES);
1219                         return [];
1220                 }
1221
1222                 if (empty($object['id'])) {
1223                         Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
1224                         return [];
1225                 }
1226                 DI::cache()->set($cachekey, $object, Duration::FIVE_MINUTES);
1227
1228                 Logger::debug('Activity was fetched successfully', ['url' => $url, 'uid' => $uid]);
1229
1230                 return $object;
1231         }
1232
1233         /**
1234          * Fetches missing posts
1235          *
1236          * @param string     $url         message URL
1237          * @param array      $child       activity array with the child of this message
1238          * @param string     $relay_actor Relay actor
1239          * @param int        $completion  Completion mode, see Receiver::COMPLETION_*
1240          * @return string fetched message URL
1241          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1242          * @throws \ImagickException
1243          */
1244         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '', int $completion = Receiver::COMPLETION_MANUAL): string
1245         {
1246                 if (!empty($child['receiver'])) {
1247                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
1248                 } else {
1249                         $uid = 0;
1250                 }
1251
1252                 $object = self::fetchCachedActivity($url, $uid);
1253                 if (empty($object)) {
1254                         return '';
1255                 }
1256
1257                 $signer = [];
1258
1259                 if (!empty($object['attributedTo'])) {
1260                         $attributed_to = $object['attributedTo'];
1261                         if (is_array($attributed_to)) {
1262                                 $compacted = JsonLD::compact($object);
1263                                 $attributed_to = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
1264                         }
1265                         $signer[] = $attributed_to;
1266                 }
1267
1268                 if (!empty($object['actor'])) {
1269                         $object_actor = $object['actor'];
1270                 } elseif (!empty($attributed_to)) {
1271                         $object_actor = $attributed_to;
1272                 } else {
1273                         // Shouldn't happen
1274                         $object_actor = '';
1275                 }
1276
1277                 $signer[] = $object_actor;
1278
1279                 if (!empty($child['author'])) {
1280                         $actor = $child['author'];
1281                         $signer[] = $actor;
1282                 } else {
1283                         $actor = $object_actor;
1284                 }
1285
1286                 if (!empty($object['published'])) {
1287                         $published = $object['published'];
1288                 } elseif (!empty($child['published'])) {
1289                         $published = $child['published'];
1290                 } else {
1291                         $published = DateTimeFormat::utcNow();
1292                 }
1293
1294                 $activity = [];
1295                 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
1296                 unset($object['@context']);
1297                 $activity['id'] = $object['id'];
1298                 $activity['to'] = $object['to'] ?? [];
1299                 $activity['cc'] = $object['cc'] ?? [];
1300                 $activity['actor'] = $actor;
1301                 $activity['object'] = $object;
1302                 $activity['published'] = $published;
1303                 $activity['type'] = 'Create';
1304
1305                 $ldactivity = JsonLD::compact($activity);
1306
1307                 $ldactivity['recursion-depth'] = !empty($child['recursion-depth']) ? $child['recursion-depth'] + 1 : 1;
1308
1309                 if (!empty($relay_actor)) {
1310                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
1311                         $ldactivity['completion-mode']   = Receiver::COMPLETION_RELAY;
1312                 } elseif (!empty($child['thread-completion'])) {
1313                         $ldactivity['thread-completion'] = $child['thread-completion'];
1314                         $ldactivity['completion-mode']   = $child['completion-mode'] ?? Receiver::COMPLETION_NONE;
1315                 } else {
1316                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
1317                         $ldactivity['completion-mode']   = $completion;
1318                 }
1319
1320                 if (!empty($child['type'])) {
1321                         $ldactivity['thread-children-type'] = $child['type'];
1322                 }
1323
1324                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
1325                         return '';
1326                 }
1327
1328                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
1329
1330                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
1331
1332                 return $activity['id'];
1333         }
1334
1335         /**
1336          * Test if incoming relay messages should be accepted
1337          *
1338          * @param array $activity activity array
1339          * @param string $id      object ID
1340          * @return boolean true if message is accepted
1341          */
1342         private static function acceptIncomingMessage(array $activity, string $id): bool
1343         {
1344                 if (empty($activity['as:object'])) {
1345                         Logger::info('No object field in activity - accepted', ['id' => $id]);
1346                         return true;
1347                 }
1348
1349                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
1350                 $uriid = ItemURI::getIdByURI($replyto ?? '');
1351                 if (Post::exists(['uri-id' => $uriid])) {
1352                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
1353                         return true;
1354                 }
1355
1356                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
1357                 $authorid = Contact::getIdForURL($attributed_to);
1358
1359                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value') ?? '');
1360
1361                 $messageTags = [];
1362                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
1363                 if (!empty($tags)) {
1364                         foreach ($tags as $tag) {
1365                                 if ($tag['type'] != 'Hashtag') {
1366                                         continue;
1367                                 }
1368                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
1369                         }
1370                 }
1371
1372                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
1373         }
1374
1375         /**
1376          * perform a "follow" request
1377          *
1378          * @param array $activity
1379          * @return void
1380          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1381          * @throws \ImagickException
1382          */
1383         public static function followUser(array $activity)
1384         {
1385                 $uid = User::getIdForURL($activity['object_id']);
1386                 if (empty($uid)) {
1387                         Queue::remove($activity);
1388                         return;
1389                 }
1390
1391                 $owner = User::getOwnerDataById($uid);
1392                 if (empty($owner)) {
1393                         return;
1394                 }
1395
1396                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1397                 if (!empty($cid)) {
1398                         self::switchContact($cid);
1399                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1400                 }
1401
1402                 $item = [
1403                         'author-id' => Contact::getIdForURL($activity['actor']),
1404                         'author-link' => $activity['actor'],
1405                 ];
1406
1407                 // Ensure that the contact has got the right network type
1408                 self::switchContact($item['author-id']);
1409
1410                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
1411                 if ($result === true) {
1412                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
1413                 }
1414
1415                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1416                 if (empty($cid)) {
1417                         return;
1418                 }
1419
1420                 if ($result && DI::config()->get('system', 'transmit_pending_events') && ($owner['contact-type'] == Contact::TYPE_COMMUNITY)) {
1421                         self::transmitPendingEvents($cid, $owner['uid']);
1422                 }
1423
1424                 if (empty($contact)) {
1425                         Contact::update(['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
1426                 }
1427                 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1428                 Queue::remove($activity);
1429         }
1430
1431         /**
1432          * Transmit pending events to the new follower
1433          *
1434          * @param integer $cid Contact id
1435          * @param integer $uid User id
1436          * @return void
1437          */
1438         private static function transmitPendingEvents(int $cid, int $uid)
1439         {
1440                 $account = DBA::selectFirst('account-user-view', ['ap-inbox', 'ap-sharedinbox'], ['id' => $cid]);
1441                 $inbox = $account['ap-sharedinbox'] ?: $account['ap-inbox'];
1442
1443                 $events = DBA::select('event', ['id'], ["`uid` = ? AND `start` > ? AND `type` != ?", $uid, DateTimeFormat::utcNow(), 'birthday']);
1444                 while ($event = DBA::fetch($events)) {
1445                         $post = Post::selectFirst(['id', 'uri-id', 'created'], ['event-id' => $event['id']]);
1446                         if (empty($post)) {
1447                                 continue;
1448                         }
1449                         if (DI::config()->get('system', 'bulk_delivery')) {
1450                                 Post\Delivery::add($post['uri-id'], $uid, $inbox, $post['created'], Delivery::POST, [$cid]);
1451                                 Worker::add(PRIORITY_HIGH, 'APDelivery', '', 0, $inbox, 0);
1452                         } else {
1453                                 Worker::add(PRIORITY_HIGH, 'APDelivery', Delivery::POST, $post['id'], $inbox, $uid, [$cid], $post['uri-id']);
1454                         }
1455                 }
1456         }
1457
1458         /**
1459          * Update the given profile
1460          *
1461          * @param array $activity
1462          * @throws \Exception
1463          */
1464         public static function updatePerson(array $activity)
1465         {
1466                 if (empty($activity['object_id'])) {
1467                         return;
1468                 }
1469
1470                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
1471                 Contact::updateFromProbeByURL($activity['object_id']);
1472                 Queue::remove($activity);
1473         }
1474
1475         /**
1476          * Delete the given profile
1477          *
1478          * @param array $activity
1479          * @return void
1480          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1481          */
1482         public static function deletePerson(array $activity)
1483         {
1484                 if (empty($activity['object_id']) || empty($activity['actor'])) {
1485                         Logger::info('Empty object id or actor.');
1486                         return;
1487                 }
1488
1489                 if ($activity['object_id'] != $activity['actor']) {
1490                         Logger::info('Object id does not match actor.');
1491                         return;
1492                 }
1493
1494                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
1495                 while ($contact = DBA::fetch($contacts)) {
1496                         Contact::remove($contact['id']);
1497                 }
1498                 DBA::close($contacts);
1499
1500                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
1501                 Queue::remove($activity);
1502         }
1503
1504         /**
1505          * Blocks the user by the contact
1506          *
1507          * @param array $activity
1508          * @return void
1509          * @throws \Exception
1510          */
1511         public static function blockAccount(array $activity)
1512         {
1513                 $cid = Contact::getIdForURL($activity['actor']);
1514                 if (empty($cid)) {
1515                         return;
1516                 }
1517
1518                 $uid = User::getIdForURL($activity['object_id']);
1519                 if (empty($uid)) {
1520                         return;
1521                 }
1522
1523                 Contact\User::setIsBlocked($cid, $uid, true);
1524
1525                 Logger::info('Contact blocked user', ['contact' => $cid, 'user' => $uid]);
1526                 Queue::remove($activity);
1527         }
1528
1529         /**
1530          * Unblocks the user by the contact
1531          *
1532          * @param array $activity
1533          * @return void
1534          * @throws \Exception
1535          */
1536         public static function unblockAccount(array $activity)
1537         {
1538                 $cid = Contact::getIdForURL($activity['actor']);
1539                 if (empty($cid)) {
1540                         return;
1541                 }
1542
1543                 $uid = User::getIdForURL($activity['object_object']);
1544                 if (empty($uid)) {
1545                         return;
1546                 }
1547
1548                 Contact\User::setIsBlocked($cid, $uid, false);
1549
1550                 Logger::info('Contact unblocked user', ['contact' => $cid, 'user' => $uid]);
1551                 Queue::remove($activity);
1552         }
1553
1554         /**
1555          * Accept a follow request
1556          *
1557          * @param array $activity
1558          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1559          * @throws \ImagickException
1560          */
1561         public static function acceptFollowUser(array $activity)
1562         {
1563                 $uid = User::getIdForURL($activity['object_actor']);
1564                 if (empty($uid)) {
1565                         return;
1566                 }
1567
1568                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1569                 if (empty($cid)) {
1570                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1571                         return;
1572                 }
1573
1574                 self::switchContact($cid);
1575
1576                 $fields = ['pending' => false];
1577
1578                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1579                 if ($contact['rel'] == Contact::FOLLOWER) {
1580                         $fields['rel'] = Contact::FRIEND;
1581                 }
1582
1583                 $condition = ['id' => $cid];
1584                 Contact::update($fields, $condition);
1585                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1586                 Queue::remove($activity);
1587         }
1588
1589         /**
1590          * Reject a follow request
1591          *
1592          * @param array $activity
1593          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1594          * @throws \ImagickException
1595          */
1596         public static function rejectFollowUser(array $activity)
1597         {
1598                 $uid = User::getIdForURL($activity['object_actor']);
1599                 if (empty($uid)) {
1600                         return;
1601                 }
1602
1603                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1604                 if (empty($cid)) {
1605                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1606                         return;
1607                 }
1608
1609                 self::switchContact($cid);
1610
1611                 $contact = Contact::getById($cid, ['rel']);
1612                 if ($contact['rel'] == Contact::SHARING) {
1613                         Contact::remove($cid);
1614                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1615                 } elseif ($contact['rel'] == Contact::FRIEND) {
1616                         Contact::update(['rel' => Contact::FOLLOWER], ['id' => $cid]);
1617                 } else {
1618                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1619                 }
1620                 Queue::remove($activity);
1621         }
1622
1623         /**
1624          * Undo activity like "like" or "dislike"
1625          *
1626          * @param array $activity
1627          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1628          * @throws \ImagickException
1629          */
1630         public static function undoActivity(array $activity)
1631         {
1632                 if (empty($activity['object_id'])) {
1633                         return;
1634                 }
1635
1636                 if (empty($activity['object_actor'])) {
1637                         return;
1638                 }
1639
1640                 $author_id = Contact::getIdForURL($activity['object_actor']);
1641                 if (empty($author_id)) {
1642                         return;
1643                 }
1644
1645                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1646                 Queue::remove($activity);
1647         }
1648
1649         /**
1650          * Activity to remove a follower
1651          *
1652          * @param array $activity
1653          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1654          * @throws \ImagickException
1655          */
1656         public static function undoFollowUser(array $activity)
1657         {
1658                 $uid = User::getIdForURL($activity['object_object']);
1659                 if (empty($uid)) {
1660                         return;
1661                 }
1662
1663                 $owner = User::getOwnerDataById($uid);
1664                 if (empty($owner)) {
1665                         return;
1666                 }
1667
1668                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1669                 if (empty($cid)) {
1670                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1671                         return;
1672                 }
1673
1674                 self::switchContact($cid);
1675
1676                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1677                 if (!DBA::isResult($contact)) {
1678                         return;
1679                 }
1680
1681                 Contact::removeFollower($contact);
1682                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1683                 Queue::remove($activity);
1684         }
1685
1686         /**
1687          * Switches a contact to AP if needed
1688          *
1689          * @param integer $cid Contact ID
1690          * @return void
1691          * @throws \Exception
1692          */
1693         private static function switchContact(int $cid)
1694         {
1695                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1696                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1697                         return;
1698                 }
1699
1700                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1701                 Contact::updateFromProbe($cid);
1702         }
1703
1704         /**
1705          * Collects implicit mentions like:
1706          * - the author of the parent item
1707          * - all the mentioned conversants in the parent item
1708          *
1709          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1710          * @return array
1711          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1712          */
1713         private static function getImplicitMentionList(array $parent): array
1714         {
1715                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1716
1717                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1718
1719                 $implicit_mentions = [];
1720                 if (empty($parent_author['url'])) {
1721                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1722                 } else {
1723                         $implicit_mentions[] = $parent_author['url'];
1724                         $implicit_mentions[] = $parent_author['nurl'];
1725                         $implicit_mentions[] = $parent_author['alias'];
1726                 }
1727
1728                 if (!empty($parent['alias'])) {
1729                         $implicit_mentions[] = $parent['alias'];
1730                 }
1731
1732                 foreach ($parent_terms as $term) {
1733                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1734                         if (!empty($contact['url'])) {
1735                                 $implicit_mentions[] = $contact['url'];
1736                                 $implicit_mentions[] = $contact['nurl'];
1737                                 $implicit_mentions[] = $contact['alias'];
1738                         }
1739                 }
1740
1741                 return $implicit_mentions;
1742         }
1743
1744         /**
1745          * Strips from the body prepended implicit mentions
1746          *
1747          * @param string $body
1748          * @param array $parent
1749          * @return string
1750          */
1751         private static function removeImplicitMentionsFromBody(string $body, array $parent): string
1752         {
1753                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1754                         return $body;
1755                 }
1756
1757                 $potential_mentions = self::getImplicitMentionList($parent);
1758
1759                 $kept_mentions = [];
1760
1761                 // Extract one prepended mention at a time from the body
1762                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1763                         if (!in_array($matches[2], $potential_mentions)) {
1764                                 $kept_mentions[] = $matches[1];
1765                         }
1766
1767                         $body = $matches[3];
1768                 }
1769
1770                 // Re-appending the kept mentions to the body after extraction
1771                 $kept_mentions[] = $body;
1772
1773                 return implode('', $kept_mentions);
1774         }
1775
1776         /**
1777          * Adds links to string mentions
1778          *
1779          * @param string $body
1780          * @param array  $tags
1781          * @return string
1782          */
1783         protected static function addMentionLinks(string $body, array $tags): string
1784         {
1785                 // This prevents links to be added again to Pleroma-style mention links
1786                 $body = self::normalizeMentionLinks($body);
1787
1788                 $body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
1789                         foreach ($tags as $tag) {
1790                                 if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1791                                         continue;
1792                                 }
1793
1794                                 $hash = substr($tag['name'], 0, 1);
1795                                 $name = substr($tag['name'], 1);
1796                                 if (!in_array($hash, Tag::TAG_CHARACTER)) {
1797                                         $hash = '';
1798                                         $name = $tag['name'];
1799                                 }
1800
1801                                 $body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
1802                         }
1803
1804                         return $body;
1805                 });
1806
1807                 return $body;
1808         }
1809 }