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