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