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