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