src/Protocol/ActivityPub/Processor.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, 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\PageInfo;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\HTML;
  27 use Friendica\Content\Text\Markdown;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Model\APContact;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Conversation;
  35 use Friendica\Model\Event;
  36 use Friendica\Model\GServer;
  37 use Friendica\Model\Item;
  38 use Friendica\Model\ItemURI;
  39 use Friendica\Model\Mail;
  40 use Friendica\Model\Tag;
  41 use Friendica\Model\User;
  42 use Friendica\Model\Post;
  43 use Friendica\Protocol\Activity;
  44 use Friendica\Protocol\ActivityPub;
  45 use Friendica\Protocol\Relay;
  46 use Friendica\Util\DateTimeFormat;
  47 use Friendica\Util\JsonLD;
  48 use Friendica\Util\Strings;
  49
  50 /**
  51  * ActivityPub Processor Protocol class
  52  */
  53 class Processor
  54 {
  55         /**
  56          * Converts mentions from Pleroma into the Friendica format
  57          *
  58          * @param string $body
  59          *
  60          * @return string converted body
  61          */
  62         private static function convertMentions($body)
  63         {
  64                 $URLSearchString = "^\[\]";
  65                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  66
  67                 return $body;
  68         }
  69
  70         /**
  71          * Convert the language array into a language JSON
  72          *
  73          * @param array $languages
  74          * @return string language JSON
  75          */
  76         private static function processLanguages(array $languages)
  77         {
  78                 $codes = array_keys($languages);
  79                 $lang = [];
  80                 foreach ($codes as $code) {
  81                         $lang[$code] = 1;
  82                 }
  83
  84                 if (empty($lang)) {
  85                         return '';
  86                 }
  87
  88                 return json_encode($lang);
  89         }
  90         /**
  91          * Replaces emojis in the body
  92          *
  93          * @param array $emojis
  94          * @param string $body
  95          *
  96          * @return string with replaced emojis
  97          */
  98         private static function replaceEmojis($body, array $emojis)
  99         {
 100                 $body = strtr($body,
 101                         array_combine(
 102                                 array_column($emojis, 'name'),
 103                                 array_map(function ($emoji) {
 104                                         return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
 105                                 }, $emojis)
 106                         )
 107                 );
 108
 109                 return $body;
 110         }
 111
 112         /**
 113          * Store attached media files in the post-media table
 114          *
 115          * @param int $uriid
 116          * @param array $attachment
 117          * @return void
 118          */
 119         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
 120         {
 121                 if (empty($attachment['url'])) {
 122                         return;
 123                 }
 124
 125                 $data = ['uri-id' => $uriid];
 126
 127                 $filetype = strtolower(substr($attachment['mediaType'], 0, strpos($attachment['mediaType'], '/')));
 128                 if ($filetype == 'image') {
 129                         $data['type'] = Post\Media::IMAGE;
 130                 } elseif ($filetype == 'video') {
 131                         $data['type'] = Post\Media::VIDEO;
 132                 } elseif ($filetype == 'audio') {
 133                         $data['type'] = Post\Media::AUDIO;
 134                 } elseif (in_array($attachment['mediaType'], ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
 135                         $data['type'] = Post\Media::TORRENT;
 136                 } else {
 137                         Logger::info('Unknown type', ['attachment' => $attachment]);
 138                         return;
 139                 }
 140
 141                 $data['url'] = $attachment['url'];
 142                 $data['mimetype'] = $attachment['mediaType'];
 143                 $data['height'] = $attachment['height'] ?? null;
 144                 $data['size'] = $attachment['size'] ?? null;
 145                 $data['preview'] = $attachment['image'] ?? null;
 146                 $data['description'] = $attachment['name'] ?? null;
 147
 148                 Post\Media::insert($data);
 149         }
 150
 151         /**
 152          * Add attachment data to the item array
 153          *
 154          * @param array   $activity
 155          * @param array   $item
 156          *
 157          * @return array array
 158          */
 159         private static function constructAttachList($activity, $item)
 160         {
 161                 if (empty($activity['attachments'])) {
 162                         return $item;
 163                 }
 164
 165                 $leading = '';
 166                 $trailing = '';
 167
 168                 foreach ($activity['attachments'] as $attach) {
 169                         switch ($attach['type']) {
 170                                 case 'link':
 171                                         $data = [
 172                                                 'url'      => $attach['url'],
 173                                                 'type'     => $attach['type'],
 174                                                 'title'    => $attach['title'] ?? '',
 175                                                 'text'     => $attach['desc']  ?? '',
 176                                                 'image'    => $attach['image'] ?? '',
 177                                                 'images'   => [],
 178                                                 'keywords' => [],
 179                                         ];
 180                                         $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
 181                                         break;
 182                                 default:
 183                                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
 184
 185                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 186                                         if ($filetype == 'image') {
 187                                                 if (!empty($activity['source'])) {
 188                                                         foreach ([0, 1, 2] as $size) {
 189                                                                 if (preg_match('#/photo/.*-' . $size . '\.#ism', $attach['url']) &&
 190                                                                         strpos(preg_replace('#(/photo/.*)-[012]\.#ism', '$1-' . $size . '.', $activity['source']), $attach['url'])) {
 191                                                                         continue 3;
 192                                                                 }
 193                                                         }
 194                                                         if (strpos($activity['source'], $attach['url'])) {
 195                                                                 continue 2;
 196                                                         }
 197                                                 }
 198
 199                                                 // image is the preview/thumbnail URL
 200                                                 if (!empty($attach['image'])) {
 201                                                         $trailing .= '[url=' . $attach['url'] . ']';
 202                                                         $attach['url'] = $attach['image'];
 203                                                 }
 204
 205                                                 if (empty($attach['name'])) {
 206                                                         $trailing .= '[img]' . $attach['url'] . '[/img]';
 207                                                 } else {
 208                                                         $trailing .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
 209                                                 }
 210
 211                                                 if (!empty($attach['image'])) {
 212                                                         $trailing .= '[/url]';
 213                                                 }
 214                                         } elseif ($filetype == 'audio') {
 215                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 216                                                         continue 2;
 217                                                 }
 218
 219                                                 $leading .= '[audio]' . $attach['url'] . "[/audio]\n";
 220                                         } elseif ($filetype == 'video') {
 221                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 222                                                         continue 2;
 223                                                 }
 224
 225                                                 $leading .= '[video]' . $attach['url'] . "[/video]\n";
 226                                         }
 227                         }
 228                 }
 229
 230                 if (!empty($leading) && !empty(trim($item['body']))) {
 231                         $item['body'] = $leading . "[hr]\n" . $item['body'];
 232                 } elseif (!empty($leading)) {
 233                         $item['body'] = $leading;
 234                 }
 235
 236                 if (!empty($trailing) && !empty(trim($item['body']))) {
 237                         $item['body'] = $item['body'] . "\n[hr]" . $trailing;
 238                 } elseif (!empty($trailing)) {
 239                         $item['body'] = $trailing;
 240                 }
 241
 242                 return $item;
 243         }
 244
 245         /**
 246          * Updates a message
 247          *
 248          * @param array $activity Activity array
 249          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 250          */
 251         public static function updateItem($activity)
 252         {
 253                 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 254                 if (!DBA::isResult($item)) {
 255                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 256                         $item = self::createItem($activity);
 257                         self::postItem($activity, $item);
 258                         return;
 259                 }
 260
 261                 $item['changed'] = DateTimeFormat::utcNow();
 262                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 263
 264                 $item = self::processContent($activity, $item);
 265
 266                 $item = self::constructAttachList($activity, $item);
 267
 268                 if (empty($item)) {
 269                         return;
 270                 }
 271
 272                 Item::update($item, ['uri' => $activity['id']]);
 273         }
 274
 275         /**
 276          * Prepares data for a message
 277          *
 278          * @param array $activity Activity array
 279          * @return array Internal item
 280          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 281          * @throws \ImagickException
 282          */
 283         public static function createItem($activity)
 284         {
 285                 $item = [];
 286                 $item['verb'] = Activity::POST;
 287                 $item['thr-parent'] = $activity['reply-to-id'];
 288
 289                 if ($activity['reply-to-id'] == $activity['id']) {
 290                         $item['gravity'] = GRAVITY_PARENT;
 291                         $item['object-type'] = Activity\ObjectType::NOTE;
 292                 } else {
 293                         $item['gravity'] = GRAVITY_COMMENT;
 294                         $item['object-type'] = Activity\ObjectType::COMMENT;
 295                 }
 296
 297                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
 298                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 299                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 300                 }
 301
 302                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 303
 304                 /// @todo What to do with $activity['context']?
 305                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
 306                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 307                         return [];
 308                 }
 309
 310                 $item['network'] = Protocol::ACTIVITYPUB;
 311                 $item['author-link'] = $activity['author'];
 312                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 313                 $item['owner-link'] = $activity['actor'];
 314                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 315
 316                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 317                         $item['private'] = Item::UNLISTED;
 318                 } elseif (in_array(0, $activity['receiver'])) {
 319                         $item['private'] = Item::PUBLIC;
 320                 } else {
 321                         $item['private'] = Item::PRIVATE;
 322                 }
 323
 324                 if (!empty($activity['raw'])) {
 325                         $item['source'] = $activity['raw'];
 326                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 327                         $item['conversation-href'] = $activity['context'] ?? '';
 328                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 329
 330                         if (isset($activity['push'])) {
 331                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 332                         }
 333                 }
 334
 335                 if (!empty($activity['from-relay'])) {
 336                         $item['direction'] = Conversation::RELAY;
 337                 }
 338
 339                 $item['isForum'] = false;
 340
 341                 if (!empty($activity['thread-completion'])) {
 342                         if ($activity['thread-completion'] != $item['owner-id']) {
 343                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
 344                                 $item['causer-link'] = $actor['url'];
 345                                 $item['causer-id'] = $activity['thread-completion'];
 346                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
 347                         } else {
 348                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 349                                 $item['causer-link'] = $item['owner-link'];
 350                                 $item['causer-id'] = $item['owner-id'];
 351                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
 352                         }
 353
 354                         $item['owner-link'] = $item['author-link'];
 355                         $item['owner-id'] = $item['author-id'];
 356                 } else {
 357                         $actor = APContact::getByURL($item['owner-link'], false);
 358                         $item['isForum'] = ($actor['type'] == 'Group');
 359                 }
 360
 361                 $item['uri'] = $activity['id'];
 362
 363                 $item['created'] = DateTimeFormat::utc($activity['published']);
 364                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 365                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 366                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 367
 368                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 369                 if (empty($item['uri-id'])) {
 370                         Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
 371                         return [];
 372                 }
 373
 374                 $item = self::processContent($activity, $item);
 375                 if (empty($item)) {
 376                         Logger::info('Message was not processed');
 377                         return [];
 378                 }
 379
 380                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 381
 382                 $item = self::constructAttachList($activity, $item);
 383
 384                 // We received the post via AP, so we set the protocol of the server to AP
 385                 $contact = Contact::getById($item['author-id'], ['gsid']);
 386                 if (!empty($contact['gsid'])) {
 387                         GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 388                 }
 389
 390                 if ($item['author-id'] != $item['owner-id']) {
 391                         $contact = Contact::getById($item['owner-id'], ['gsid']);
 392                         if (!empty($contact['gsid'])) {
 393                                 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
 394                         }
 395                 }
 396
 397                 return $item;
 398         }
 399
 400         /**
 401          * Delete items
 402          *
 403          * @param array $activity
 404          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 405          * @throws \ImagickException
 406          */
 407         public static function deleteItem($activity)
 408         {
 409                 $owner = Contact::getIdForURL($activity['actor']);
 410
 411                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 412                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 413         }
 414
 415         /**
 416          * Prepare the item array for an activity
 417          *
 418          * @param array $activity Activity array
 419          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 420          * @throws \ImagickException
 421          */
 422         public static function addTag($activity)
 423         {
 424                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 425                         return;
 426                 }
 427
 428                 foreach ($activity['receiver'] as $receiver) {
 429                         $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 430                         if (!DBA::isResult($item)) {
 431                                 // We don't fetch missing content for this purpose
 432                                 continue;
 433                         }
 434
 435                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 436                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 437                                 continue;
 438                         }
 439
 440                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 441                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 442                 }
 443         }
 444
 445         /**
 446          * Prepare the item array for an activity
 447          *
 448          * @param array  $activity Activity array
 449          * @param string $verb     Activity verb
 450          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 451          * @throws \ImagickException
 452          */
 453         public static function createActivity($activity, $verb)
 454         {
 455                 $item = self::createItem($activity);
 456                 $item['verb'] = $verb;
 457                 $item['thr-parent'] = $activity['object_id'];
 458                 $item['gravity'] = GRAVITY_ACTIVITY;
 459                 $item['object-type'] = Activity\ObjectType::NOTE;
 460
 461                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 462
 463                 self::postItem($activity, $item);
 464         }
 465
 466         /**
 467          * Create an event
 468          *
 469          * @param array $activity Activity array
 470          * @param array $item
 471          * @throws \Exception
 472          */
 473         public static function createEvent($activity, $item)
 474         {
 475                 $event['summary']   = HTML::toBBCode($activity['name']);
 476                 $event['desc']      = HTML::toBBCode($activity['content']);
 477                 $event['start']     = $activity['start-time'];
 478                 $event['finish']    = $activity['end-time'];
 479                 $event['nofinish']  = empty($event['finish']);
 480                 $event['location']  = $activity['location'];
 481                 $event['adjust']    = true;
 482                 $event['cid']       = $item['contact-id'];
 483                 $event['uid']       = $item['uid'];
 484                 $event['uri']       = $item['uri'];
 485                 $event['edited']    = $item['edited'];
 486                 $event['private']   = $item['private'];
 487                 $event['guid']      = $item['guid'];
 488                 $event['plink']     = $item['plink'];
 489                 $event['network']   = $item['network'];
 490                 $event['protocol']  = $item['protocol'];
 491                 $event['direction'] = $item['direction'];
 492                 $event['source']    = $item['source'];
 493
 494                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 495                 $ev = DBA::selectFirst('event', ['id'], $condition);
 496                 if (DBA::isResult($ev)) {
 497                         $event['id'] = $ev['id'];
 498                 }
 499
 500                 $event_id = Event::store($event);
 501                 Logger::info('Event was stored', ['id' => $event_id]);
 502         }
 503
 504         /**
 505          * Process the content
 506          *
 507          * @param array $activity Activity array
 508          * @param array $item
 509          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 510          * @throws \Exception
 511          */
 512         private static function processContent($activity, $item)
 513         {
 514                 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
 515                         $item['title'] = Markdown::toBBCode($activity['name']);
 516                         $content = Markdown::toBBCode($activity['content']);
 517                 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
 518                         $item['title'] = $activity['name'];
 519                         $content = $activity['content'];
 520                 } else {
 521                         // By default assume "text/html"
 522                         $item['title'] = HTML::toBBCode($activity['name']);
 523                         $content = HTML::toBBCode($activity['content']);
 524                 }
 525
 526                 if (!empty($activity['languages'])) {
 527                         $item['language'] = self::processLanguages($activity['languages']);
 528                 }
 529
 530                 if (!empty($activity['emojis'])) {
 531                         $content = self::replaceEmojis($content, $activity['emojis']);
 532                 }
 533
 534                 $content = self::convertMentions($content);
 535
 536                 if (!empty($activity['source'])) {
 537                         $item['body'] = $activity['source'];
 538                         $item['raw-body'] = $content;
 539                 } else {
 540                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 541                                 $item_private = !in_array(0, $activity['item_receiver']);
 542                                 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 543                                 if (!DBA::isResult($parent)) {
 544                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 545                                         return false;
 546                                 }
 547                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 548                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 549                                         return false;
 550                                 }
 551
 552                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 553                         }
 554                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 555                         $item['raw-body'] = $item['body'] = $content;
 556                 }
 557
 558                 self::storeFromBody($item);
 559                 self::storeTags($item['uri-id'], $activity['tags']);
 560
 561                 $item['location'] = $activity['location'];
 562
 563                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 564                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 565                 }
 566
 567                 $item['app'] = $activity['generator'];
 568
 569                 return $item;
 570         }
 571
 572         /**
 573          * Store hashtags and mentions
 574          *
 575          * @param array $item
 576          */
 577         private static function storeFromBody(array $item)
 578         {
 579                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 580                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 581
 582                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 583         }
 584
 585         /**
 586          * Generate a GUID out of an URL
 587          *
 588          * @param string $url message URL
 589          * @return string with GUID
 590          */
 591         private static function getGUIDByURL(string $url)
 592         {
 593                 $parsed = parse_url($url);
 594
 595                 $host_hash = hash('crc32', $parsed['host']);
 596
 597                 unset($parsed["scheme"]);
 598                 unset($parsed["host"]);
 599
 600                 $path = implode("/", $parsed);
 601
 602                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 603         }
 604
 605         /**
 606          * Creates an item post
 607          *
 608          * @param array $activity Activity data
 609          * @param array $item     item array
 610          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 611          * @throws \ImagickException
 612          */
 613         public static function postItem(array $activity, array $item)
 614         {
 615                 if (empty($item)) {
 616                         return;
 617                 }
 618
 619                 $stored = false;
 620                 ksort($activity['receiver']);
 621
 622                 foreach ($activity['receiver'] as $receiver) {
 623                         if ($receiver == -1) {
 624                                 continue;
 625                         }
 626
 627                         $item['uid'] = $receiver;
 628
 629                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 630                         switch($type) {
 631                                 case Receiver::TARGET_TO:
 632                                         $item['post-type'] = Item::PT_TO;
 633                                         break;
 634                                 case Receiver::TARGET_CC:
 635                                         $item['post-type'] = Item::PT_CC;
 636                                         break;
 637                                 case Receiver::TARGET_BTO:
 638                                         $item['post-type'] = Item::PT_BTO;
 639                                         break;
 640                                 case Receiver::TARGET_BCC:
 641                                         $item['post-type'] = Item::PT_BCC;
 642                                         break;
 643                                 case Receiver::TARGET_FOLLOWER:
 644                                         $item['post-type'] = Item::PT_FOLLOWER;
 645                                         break;
 646                                 case Receiver::TARGET_ANSWER:
 647                                         $item['post-type'] = Item::PT_COMMENT;
 648                                         break;
 649                                 case Receiver::TARGET_GLOBAL:
 650                                         $item['post-type'] = Item::PT_GLOBAL;
 651                                         break;
 652                                 default:
 653                                         $item['post-type'] = Item::PT_ARTICLE;
 654                         }
 655
 656                         if (!empty($activity['from-relay'])) {
 657                                 $item['post-type'] = Item::PT_RELAY;
 658                         } elseif (!empty($activity['thread-completion'])) {
 659                                 $item['post-type'] = Item::PT_FETCHED;
 660                         }
 661
 662                         if ($item['isForum'] ?? false) {
 663                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 664                         } else {
 665                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 666                         }
 667
 668                         if (($receiver != 0) && empty($item['contact-id'])) {
 669                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 670                         }
 671
 672                         if (!empty($activity['directmessage'])) {
 673                                 self::postMail($activity, $item);
 674                                 continue;
 675                         }
 676
 677                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 678                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 679
 680                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 681                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 682                                 }
 683
 684                                 if ($skip) {
 685                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 686                                         continue;
 687                                 }
 688
 689                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 690                         }
 691
 692                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 693                                 self::createEvent($activity, $item);
 694                         }
 695
 696                         $item_id = Item::insert($item);
 697                         if ($item_id) {
 698                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 699                         } else {
 700                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 701                         }
 702
 703                         if ($item['uid'] == 0) {
 704                                 $stored = $item_id;
 705                         }
 706                 }
 707
 708                 // Store send a follow request for every reshare - but only when the item had been stored
 709                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 710                         $author = APContact::getByURL($item['owner-link'], false);
 711                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 712                         if ($author['type'] != 'Group') {
 713                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 714                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 715                         }
 716                 }
 717         }
 718
 719         /**
 720          * Store tags and mentions into the tag table
 721          *
 722          * @param integer $uriid
 723          * @param array $tags
 724          */
 725         private static function storeTags(int $uriid, array $tags = null)
 726         {
 727                 foreach ($tags as $tag) {
 728                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 729                                 continue;
 730                         }
 731
 732                         $hash = substr($tag['name'], 0, 1);
 733
 734                         if ($tag['type'] == 'Mention') {
 735                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 736                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 737                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 738                                         $tag['name'] = substr($tag['name'], 1);
 739                                 }
 740                                 $type = Tag::IMPLICIT_MENTION;
 741
 742                                 if (!empty($tag['href'])) {
 743                                         $apcontact = APContact::getByURL($tag['href']);
 744                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 745                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 746                                         }
 747                                 }
 748                         } elseif ($tag['type'] == 'Hashtag') {
 749                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 750                                         $tag['name'] = substr($tag['name'], 1);
 751                                 }
 752                                 $type = Tag::HASHTAG;
 753                         }
 754
 755                         if (empty($tag['name'])) {
 756                                 continue;
 757                         }
 758
 759                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 760                 }
 761         }
 762
 763         /**
 764          * Creates an mail post
 765          *
 766          * @param array $activity Activity data
 767          * @param array $item     item array
 768          * @return int|bool New mail table row id or false on error
 769          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 770          */
 771         private static function postMail($activity, $item)
 772         {
 773                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 774                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 775                         return false;
 776                 }
 777
 778                 Logger::info('Direct Message', $item);
 779
 780                 $msg = [];
 781                 $msg['uid'] = $item['uid'];
 782
 783                 $msg['contact-id'] = $item['contact-id'];
 784
 785                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 786                 $msg['from-name'] = $contact['name'];
 787                 $msg['from-url'] = $contact['url'];
 788                 $msg['from-photo'] = $contact['photo'];
 789
 790                 $msg['uri'] = $item['uri'];
 791                 $msg['created'] = $item['created'];
 792
 793                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 794                 if (DBA::isResult($parent)) {
 795                         $msg['parent-uri'] = $parent['parent-uri'];
 796                         $msg['title'] = $parent['title'];
 797                 } else {
 798                         $msg['parent-uri'] = $item['thr-parent'];
 799
 800                         if (!empty($item['title'])) {
 801                                 $msg['title'] = $item['title'];
 802                         } elseif (!empty($item['content-warning'])) {
 803                                 $msg['title'] = $item['content-warning'];
 804                         } else {
 805                                 // Trying to generate a title out of the body
 806                                 $title = $item['body'];
 807
 808                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 809                                         $title = $matches[3];
 810                                 }
 811
 812                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 813
 814                                 if (strlen($title) > 20) {
 815                                         $title = substr($title, 0, 20) . '...';
 816                                 }
 817
 818                                 $msg['title'] = $title;
 819                         }
 820                 }
 821                 $msg['body'] = $item['body'];
 822
 823                 return Mail::insert($msg);
 824         }
 825
 826         /**
 827          * Fetches missing posts
 828          *
 829          * @param string $url         message URL
 830          * @param array  $child       activity array with the child of this message
 831          * @param string $relay_actor Relay actor
 832          * @return string fetched message URL
 833          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 834          */
 835         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
 836         {
 837                 if (!empty($child['receiver'])) {
 838                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 839                 } else {
 840                         $uid = 0;
 841                 }
 842
 843                 $object = ActivityPub::fetchContent($url, $uid);
 844                 if (empty($object)) {
 845                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 846                         return '';
 847                 }
 848
 849                 if (empty($object['id'])) {
 850                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 851                         return '';
 852                 }
 853
 854                 if (!empty($object['actor'])) {
 855                         $object_actor = $object['actor'];
 856                 } elseif (!empty($object['attributedTo'])) {
 857                         $object_actor = $object['attributedTo'];
 858                         if (is_array($object_actor)) {
 859                                 $compacted = JsonLD::compact($object);
 860                                 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
 861                         }
 862                 } else {
 863                         // Shouldn't happen
 864                         $object_actor = '';
 865                 }
 866
 867                 $signer = [$object_actor];
 868
 869                 if (!empty($child['author'])) {
 870                         $actor = $child['author'];
 871                         $signer[] = $actor;
 872                 } else {
 873                         $actor = $object_actor;
 874                 }
 875
 876                 if (!empty($object['published'])) {
 877                         $published = $object['published'];
 878                 } elseif (!empty($child['published'])) {
 879                         $published = $child['published'];
 880                 } else {
 881                         $published = DateTimeFormat::utcNow();
 882                 }
 883
 884                 $activity = [];
 885                 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
 886                 unset($object['@context']);
 887                 $activity['id'] = $object['id'];
 888                 $activity['to'] = $object['to'] ?? [];
 889                 $activity['cc'] = $object['cc'] ?? [];
 890                 $activity['actor'] = $actor;
 891                 $activity['object'] = $object;
 892                 $activity['published'] = $published;
 893                 $activity['type'] = 'Create';
 894
 895                 $ldactivity = JsonLD::compact($activity);
 896
 897                 if (!empty($relay_actor)) {
 898                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
 899                 } elseif (!empty($child['thread-completion'])) {
 900                         $ldactivity['thread-completion'] = $child['thread-completion'];
 901                 } else {
 902                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
 903                 }
 904
 905                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
 906                         return '';
 907                 }
 908
 909                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
 910
 911                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 912
 913                 return $activity['id'];
 914         }
 915
 916         /**
 917          * Test if incoming relay messages should be accepted
 918          *
 919          * @param array $activity activity array
 920          * @param string $id      object ID
 921          * @return boolean true if message is accepted
 922          */
 923         private static function acceptIncomingMessage(array $activity, string $id)
 924         {
 925                 if (empty($activity['as:object'])) {
 926                         Logger::info('No object field in activity - accepted', ['id' => $id]);
 927                         return true;
 928                 }
 929
 930                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
 931                 $uriid = ItemURI::getIdByURI($replyto);
 932                 if (Post::exists(['uri-id' => $uriid])) {
 933                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
 934                         return true;
 935                 }
 936
 937                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
 938                 $authorid = Contact::getIdForURL($attributed_to);
 939
 940                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
 941
 942                 $messageTags = [];
 943                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
 944                 if (!empty($tags)) {
 945                         foreach ($tags as $tag) {
 946                                 if ($tag['type'] != 'Hashtag') {
 947                                         continue;
 948                                 }
 949                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
 950                         }
 951                 }
 952
 953                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
 954         }
 955
 956         /**
 957          * perform a "follow" request
 958          *
 959          * @param array $activity
 960          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 961          * @throws \ImagickException
 962          */
 963         public static function followUser($activity)
 964         {
 965                 $uid = User::getIdForURL($activity['object_id']);
 966                 if (empty($uid)) {
 967                         return;
 968                 }
 969
 970                 $owner = User::getOwnerDataById($uid);
 971                 if (empty($owner)) {
 972                         return;
 973                 }
 974
 975                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 976                 if (!empty($cid)) {
 977                         self::switchContact($cid);
 978                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 979                 }
 980
 981                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 982                         'author-link' => $activity['actor']];
 983
 984                 // Ensure that the contact has got the right network type
 985                 self::switchContact($item['author-id']);
 986
 987                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
 988                 if ($result === true) {
 989                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 990                 }
 991
 992                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 993                 if (empty($cid)) {
 994                         return;
 995                 }
 996
 997                 if (empty($contact)) {
 998                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 999                 }
1000
1001                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
1002         }
1003
1004         /**
1005          * Update the given profile
1006          *
1007          * @param array $activity
1008          * @throws \Exception
1009          */
1010         public static function updatePerson($activity)
1011         {
1012                 if (empty($activity['object_id'])) {
1013                         return;
1014                 }
1015
1016                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
1017                 Contact::updateFromProbeByURL($activity['object_id']);
1018         }
1019
1020         /**
1021          * Delete the given profile
1022          *
1023          * @param array $activity
1024          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1025          */
1026         public static function deletePerson($activity)
1027         {
1028                 if (empty($activity['object_id']) || empty($activity['actor'])) {
1029                         Logger::info('Empty object id or actor.');
1030                         return;
1031                 }
1032
1033                 if ($activity['object_id'] != $activity['actor']) {
1034                         Logger::info('Object id does not match actor.');
1035                         return;
1036                 }
1037
1038                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
1039                 while ($contact = DBA::fetch($contacts)) {
1040                         Contact::remove($contact['id']);
1041                 }
1042                 DBA::close($contacts);
1043
1044                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
1045         }
1046
1047         /**
1048          * Accept a follow request
1049          *
1050          * @param array $activity
1051          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1052          * @throws \ImagickException
1053          */
1054         public static function acceptFollowUser($activity)
1055         {
1056                 $uid = User::getIdForURL($activity['object_actor']);
1057                 if (empty($uid)) {
1058                         return;
1059                 }
1060
1061                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1062                 if (empty($cid)) {
1063                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1064                         return;
1065                 }
1066
1067                 self::switchContact($cid);
1068
1069                 $fields = ['pending' => false];
1070
1071                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1072                 if ($contact['rel'] == Contact::FOLLOWER) {
1073                         $fields['rel'] = Contact::FRIEND;
1074                 }
1075
1076                 $condition = ['id' => $cid];
1077                 DBA::update('contact', $fields, $condition);
1078                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1079         }
1080
1081         /**
1082          * Reject a follow request
1083          *
1084          * @param array $activity
1085          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1086          * @throws \ImagickException
1087          */
1088         public static function rejectFollowUser($activity)
1089         {
1090                 $uid = User::getIdForURL($activity['object_actor']);
1091                 if (empty($uid)) {
1092                         return;
1093                 }
1094
1095                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1096                 if (empty($cid)) {
1097                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1098                         return;
1099                 }
1100
1101                 self::switchContact($cid);
1102
1103                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1104                         Contact::remove($cid);
1105                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1106                 } else {
1107                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1108                 }
1109         }
1110
1111         /**
1112          * Undo activity like "like" or "dislike"
1113          *
1114          * @param array $activity
1115          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1116          * @throws \ImagickException
1117          */
1118         public static function undoActivity($activity)
1119         {
1120                 if (empty($activity['object_id'])) {
1121                         return;
1122                 }
1123
1124                 if (empty($activity['object_actor'])) {
1125                         return;
1126                 }
1127
1128                 $author_id = Contact::getIdForURL($activity['object_actor']);
1129                 if (empty($author_id)) {
1130                         return;
1131                 }
1132
1133                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1134         }
1135
1136         /**
1137          * Activity to remove a follower
1138          *
1139          * @param array $activity
1140          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1141          * @throws \ImagickException
1142          */
1143         public static function undoFollowUser($activity)
1144         {
1145                 $uid = User::getIdForURL($activity['object_object']);
1146                 if (empty($uid)) {
1147                         return;
1148                 }
1149
1150                 $owner = User::getOwnerDataById($uid);
1151                 if (empty($owner)) {
1152                         return;
1153                 }
1154
1155                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1156                 if (empty($cid)) {
1157                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1158                         return;
1159                 }
1160
1161                 self::switchContact($cid);
1162
1163                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1164                 if (!DBA::isResult($contact)) {
1165                         return;
1166                 }
1167
1168                 Contact::removeFollower($owner, $contact);
1169                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1170         }
1171
1172         /**
1173          * Switches a contact to AP if needed
1174          *
1175          * @param integer $cid Contact ID
1176          * @throws \Exception
1177          */
1178         private static function switchContact($cid)
1179         {
1180                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1181                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1182                         return;
1183                 }
1184
1185                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1186                 Contact::updateFromProbe($cid);
1187         }
1188
1189         /**
1190          * Collects implicit mentions like:
1191          * - the author of the parent item
1192          * - all the mentioned conversants in the parent item
1193          *
1194          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1195          * @return array
1196          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1197          */
1198         private static function getImplicitMentionList(array $parent)
1199         {
1200                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1201
1202                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1203
1204                 $implicit_mentions = [];
1205                 if (empty($parent_author['url'])) {
1206                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1207                 } else {
1208                         $implicit_mentions[] = $parent_author['url'];
1209                         $implicit_mentions[] = $parent_author['nurl'];
1210                         $implicit_mentions[] = $parent_author['alias'];
1211                 }
1212
1213                 if (!empty($parent['alias'])) {
1214                         $implicit_mentions[] = $parent['alias'];
1215                 }
1216
1217                 foreach ($parent_terms as $term) {
1218                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1219                         if (!empty($contact['url'])) {
1220                                 $implicit_mentions[] = $contact['url'];
1221                                 $implicit_mentions[] = $contact['nurl'];
1222                                 $implicit_mentions[] = $contact['alias'];
1223                         }
1224                 }
1225
1226                 return $implicit_mentions;
1227         }
1228
1229         /**
1230          * Strips from the body prepended implicit mentions
1231          *
1232          * @param string $body
1233          * @param array $parent
1234          * @return string
1235          */
1236         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1237         {
1238                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1239                         return $body;
1240                 }
1241
1242                 $potential_mentions = self::getImplicitMentionList($parent);
1243
1244                 $kept_mentions = [];
1245
1246                 // Extract one prepended mention at a time from the body
1247                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1248                         if (!in_array($matches[2], $potential_mentions)) {
1249                                 $kept_mentions[] = $matches[1];
1250                         }
1251
1252                         $body = $matches[3];
1253                 }
1254
1255                 // Re-appending the kept mentions to the body after extraction
1256                 $kept_mentions[] = $body;
1257
1258                 return implode('', $kept_mentions);
1259         }
1260 }