src/Protocol/ActivityPub/Processor.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\PageInfo;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\HTML;
  27 use Friendica\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\Item;
  36 use Friendica\Model\ItemURI;
  37 use Friendica\Model\Mail;
  38 use Friendica\Model\Tag;
  39 use Friendica\Model\User;
  40 use Friendica\Model\Post;
  41 use Friendica\Protocol\Activity;
  42 use Friendica\Protocol\ActivityPub;
  43 use Friendica\Protocol\Relay;
  44 use Friendica\Util\DateTimeFormat;
  45 use Friendica\Util\JsonLD;
  46 use Friendica\Util\Strings;
  47
  48 /**
  49  * ActivityPub Processor Protocol class
  50  */
  51 class Processor
  52 {
  53         /**
  54          * Converts mentions from Pleroma into the Friendica format
  55          *
  56          * @param string $body
  57          *
  58          * @return string converted body
  59          */
  60         private static function convertMentions($body)
  61         {
  62                 $URLSearchString = "^\[\]";
  63                 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
  64
  65                 return $body;
  66         }
  67
  68         /**
  69          * Replaces emojis in the body
  70          *
  71          * @param array $emojis
  72          * @param string $body
  73          *
  74          * @return string with replaced emojis
  75          */
  76         private static function replaceEmojis($body, array $emojis)
  77         {
  78                 $body = strtr($body,
  79                         array_combine(
  80                                 array_column($emojis, 'name'),
  81                                 array_map(function ($emoji) {
  82                                         return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
  83                                 }, $emojis)
  84                         )
  85                 );
  86
  87                 return $body;
  88         }
  89
  90         /**
  91          * Store attached media files in the post-media table
  92          *
  93          * @param int $uriid
  94          * @param array $attachment
  95          * @return void
  96          */
  97         private static function storeAttachmentAsMedia(int $uriid, array $attachment)
  98         {
  99                 if (empty($attachment['url'])) {
 100                         return;
 101                 }
 102
 103                 $data = ['uri-id' => $uriid];
 104
 105                 $filetype = strtolower(substr($attachment['mediaType'], 0, strpos($attachment['mediaType'], '/')));
 106                 if ($filetype == 'image') {
 107                         $data['type'] = Post\Media::IMAGE;
 108                 } elseif ($filetype == 'video') {
 109                         $data['type'] = Post\Media::VIDEO;
 110                 } elseif ($filetype == 'audio') {
 111                         $data['type'] = Post\Media::AUDIO;
 112                 } elseif (in_array($attachment['mediaType'], ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
 113                         $data['type'] = Post\Media::TORRENT;
 114                 } else {
 115                         Logger::info('Unknown type', ['attachment' => $attachment]);
 116                         return;
 117                 }
 118
 119                 $data['url'] = $attachment['url'];
 120                 $data['mimetype'] = $attachment['mediaType'];
 121                 $data['height'] = $attachment['height'] ?? null;
 122                 $data['size'] = $attachment['size'] ?? null;
 123                 $data['preview'] = $attachment['image'] ?? null;
 124                 $data['description'] = $attachment['name'] ?? null;
 125
 126                 Post\Media::insert($data);
 127         }
 128
 129         /**
 130          * Add attachment data to the item array
 131          *
 132          * @param array   $activity
 133          * @param array   $item
 134          *
 135          * @return array array
 136          */
 137         private static function constructAttachList($activity, $item)
 138         {
 139                 if (empty($activity['attachments'])) {
 140                         return $item;
 141                 }
 142
 143                 foreach ($activity['attachments'] as $attach) {
 144                         switch ($attach['type']) {
 145                                 case 'link':
 146                                         $data = [
 147                                                 'url'      => $attach['url'],
 148                                                 'type'     => $attach['type'],
 149                                                 'title'    => $attach['title'] ?? '',
 150                                                 'text'     => $attach['desc']  ?? '',
 151                                                 'image'    => $attach['image'] ?? '',
 152                                                 'images'   => [],
 153                                                 'keywords' => [],
 154                                         ];
 155                                         $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
 156                                         break;
 157                                 default:
 158                                         self::storeAttachmentAsMedia($item['uri-id'], $attach);
 159
 160                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 161                                         if ($filetype == 'image') {
 162                                                 if (!empty($activity['source'])) {
 163                                                         foreach ([0, 1, 2] as $size) {
 164                                                                 if (preg_match('#/photo/.*-' . $size . '\.#ism', $attach['url']) &&
 165                                                                         strpos(preg_replace('#(/photo/.*)-[012]\.#ism', '$1-' . $size . '.', $activity['source']), $attach['url'])) {
 166                                                                         continue 3;
 167                                                                 }
 168                                                         }
 169                                                         if (strpos($activity['source'], $attach['url'])) {
 170                                                                 continue 2;
 171                                                         }
 172                                                 }
 173
 174                                                 $item['body'] .= "\n";
 175
 176                                                 // image is the preview/thumbnail URL
 177                                                 if (!empty($attach['image'])) {
 178                                                         $item['body'] .= '[url=' . $attach['url'] . ']';
 179                                                         $attach['url'] = $attach['image'];
 180                                                 }
 181
 182                                                 if (empty($attach['name'])) {
 183                                                         $item['body'] .= '[img]' . $attach['url'] . '[/img]';
 184                                                 } else {
 185                                                         $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
 186                                                 }
 187
 188                                                 if (!empty($attach['image'])) {
 189                                                         $item['body'] .= '[/url]';
 190                                                 }
 191                                         } elseif ($filetype == 'audio') {
 192                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 193                                                         continue 2;
 194                                                 }
 195
 196                                                 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
 197                                         } elseif ($filetype == 'video') {
 198                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 199                                                         continue 2;
 200                                                 }
 201
 202                                                 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
 203                                         }
 204                         }
 205                 }
 206
 207                 return $item;
 208         }
 209
 210         /**
 211          * Updates a message
 212          *
 213          * @param array $activity Activity array
 214          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 215          */
 216         public static function updateItem($activity)
 217         {
 218                 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 219                 if (!DBA::isResult($item)) {
 220                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 221                         $item = self::createItem($activity);
 222                         self::postItem($activity, $item);
 223                         return;
 224                 }
 225
 226                 $item['changed'] = DateTimeFormat::utcNow();
 227                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 228
 229                 $item = self::processContent($activity, $item);
 230
 231                 $item = self::constructAttachList($activity, $item);
 232
 233                 if (empty($item)) {
 234                         return;
 235                 }
 236
 237                 Item::update($item, ['uri' => $activity['id']]);
 238         }
 239
 240         /**
 241          * Prepares data for a message
 242          *
 243          * @param array $activity Activity array
 244          * @return array Internal item
 245          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 246          * @throws \ImagickException
 247          */
 248         public static function createItem($activity)
 249         {
 250                 $item = [];
 251                 $item['verb'] = Activity::POST;
 252                 $item['thr-parent'] = $activity['reply-to-id'];
 253
 254                 if ($activity['reply-to-id'] == $activity['id']) {
 255                         $item['gravity'] = GRAVITY_PARENT;
 256                         $item['object-type'] = Activity\ObjectType::NOTE;
 257                 } else {
 258                         $item['gravity'] = GRAVITY_COMMENT;
 259                         $item['object-type'] = Activity\ObjectType::COMMENT;
 260                 }
 261
 262                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 263                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 264                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 265                 }
 266
 267                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 268
 269                 /// @todo What to do with $activity['context']?
 270                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 271                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 272                         return [];
 273                 }
 274
 275                 $item['network'] = Protocol::ACTIVITYPUB;
 276                 $item['author-link'] = $activity['author'];
 277                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 278                 $item['owner-link'] = $activity['actor'];
 279                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 280
 281                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 282                         $item['private'] = Item::UNLISTED;
 283                 } elseif (in_array(0, $activity['receiver'])) {
 284                         $item['private'] = Item::PUBLIC;
 285                 } else {
 286                         $item['private'] = Item::PRIVATE;
 287                 }
 288
 289                 if (!empty($activity['raw'])) {
 290                         $item['source'] = $activity['raw'];
 291                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 292                         $item['conversation-href'] = $activity['context'] ?? '';
 293                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 294
 295                         if (isset($activity['push'])) {
 296                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 297                         }
 298                 }
 299
 300                 $item['isForum'] = false;
 301
 302                 if (!empty($activity['thread-completion'])) {
 303                         if ($activity['thread-completion'] != $item['owner-id']) {
 304                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
 305                                 $item['causer-link'] = $actor['url'];
 306                                 $item['causer-id'] = $activity['thread-completion'];
 307                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
 308                         } else {
 309                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 310                                 $item['causer-link'] = $item['owner-link'];
 311                                 $item['causer-id'] = $item['owner-id'];
 312                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
 313                         }
 314
 315                         $item['owner-link'] = $item['author-link'];
 316                         $item['owner-id'] = $item['author-id'];
 317                 } else {
 318                         $actor = APContact::getByURL($item['owner-link'], false);
 319                         $item['isForum'] = ($actor['type'] == 'Group');
 320                 }
 321
 322                 $item['uri'] = $activity['id'];
 323
 324                 $item['created'] = DateTimeFormat::utc($activity['published']);
 325                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 326                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 327                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 328
 329                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 330
 331                 $item = self::processContent($activity, $item);
 332                 if (empty($item)) {
 333                         Logger::info('Message was not processed');
 334                         return [];
 335                 }
 336
 337                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 338
 339                 $item = self::constructAttachList($activity, $item);
 340
 341                 return $item;
 342         }
 343
 344         /**
 345          * Delete items
 346          *
 347          * @param array $activity
 348          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 349          * @throws \ImagickException
 350          */
 351         public static function deleteItem($activity)
 352         {
 353                 $owner = Contact::getIdForURL($activity['actor']);
 354
 355                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 356                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 357         }
 358
 359         /**
 360          * Prepare the item array for an activity
 361          *
 362          * @param array $activity Activity array
 363          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 364          * @throws \ImagickException
 365          */
 366         public static function addTag($activity)
 367         {
 368                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 369                         return;
 370                 }
 371
 372                 foreach ($activity['receiver'] as $receiver) {
 373                         $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 374                         if (!DBA::isResult($item)) {
 375                                 // We don't fetch missing content for this purpose
 376                                 continue;
 377                         }
 378
 379                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 380                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 381                                 continue;
 382                         }
 383
 384                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 385                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 386                 }
 387         }
 388
 389         /**
 390          * Prepare the item array for an activity
 391          *
 392          * @param array  $activity Activity array
 393          * @param string $verb     Activity verb
 394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 395          * @throws \ImagickException
 396          */
 397         public static function createActivity($activity, $verb)
 398         {
 399                 $item = self::createItem($activity);
 400                 $item['verb'] = $verb;
 401                 $item['thr-parent'] = $activity['object_id'];
 402                 $item['gravity'] = GRAVITY_ACTIVITY;
 403                 $item['object-type'] = Activity\ObjectType::NOTE;
 404
 405                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 406
 407                 self::postItem($activity, $item);
 408         }
 409
 410         /**
 411          * Create an event
 412          *
 413          * @param array $activity Activity array
 414          * @param array $item
 415          * @throws \Exception
 416          */
 417         public static function createEvent($activity, $item)
 418         {
 419                 $event['summary']  = HTML::toBBCode($activity['name']);
 420                 $event['desc']     = HTML::toBBCode($activity['content']);
 421                 $event['start']    = $activity['start-time'];
 422                 $event['finish']   = $activity['end-time'];
 423                 $event['nofinish'] = empty($event['finish']);
 424                 $event['location'] = $activity['location'];
 425                 $event['adjust']   = true;
 426                 $event['cid']      = $item['contact-id'];
 427                 $event['uid']      = $item['uid'];
 428                 $event['uri']      = $item['uri'];
 429                 $event['edited']   = $item['edited'];
 430                 $event['private']  = $item['private'];
 431                 $event['guid']     = $item['guid'];
 432                 $event['plink']    = $item['plink'];
 433
 434                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 435                 $ev = DBA::selectFirst('event', ['id'], $condition);
 436                 if (DBA::isResult($ev)) {
 437                         $event['id'] = $ev['id'];
 438                 }
 439
 440                 $event_id = Event::store($event);
 441                 Logger::info('Event was stored', ['id' => $event_id]);
 442         }
 443
 444         /**
 445          * Process the content
 446          *
 447          * @param array $activity Activity array
 448          * @param array $item
 449          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 450          * @throws \Exception
 451          */
 452         private static function processContent($activity, $item)
 453         {
 454                 $item['title'] = HTML::toBBCode($activity['name']);
 455
 456                 $content = HTML::toBBCode($activity['content']);
 457
 458                 if (!empty($activity['emojis'])) {
 459                         $content = self::replaceEmojis($content, $activity['emojis']);
 460                 }
 461
 462                 $content = self::convertMentions($content);
 463
 464                 if (!empty($activity['source'])) {
 465                         $item['body'] = $activity['source'];
 466                         $item['raw-body'] = $content;
 467                 } else {
 468                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 469                                 $item_private = !in_array(0, $activity['item_receiver']);
 470                                 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 471                                 if (!DBA::isResult($parent)) {
 472                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 473                                         return false;
 474                                 }
 475                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 476                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 477                                         return false;
 478                                 }
 479
 480                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 481                         }
 482                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 483                         $item['raw-body'] = $item['body'] = $content;
 484                 }
 485
 486                 self::storeFromBody($item);
 487                 self::storeTags($item['uri-id'], $activity['tags']);
 488
 489                 $item['location'] = $activity['location'];
 490
 491                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 492                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 493                 }
 494
 495                 $item['app'] = $activity['generator'];
 496
 497                 return $item;
 498         }
 499
 500         /**
 501          * Store hashtags and mentions
 502          *
 503          * @param array $item
 504          */
 505         private static function storeFromBody(array $item)
 506         {
 507                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 508                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 509
 510                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 511         }
 512
 513         /**
 514          * Generate a GUID out of an URL
 515          *
 516          * @param string $url message URL
 517          * @return string with GUID
 518          */
 519         private static function getGUIDByURL(string $url)
 520         {
 521                 $parsed = parse_url($url);
 522
 523                 $host_hash = hash('crc32', $parsed['host']);
 524
 525                 unset($parsed["scheme"]);
 526                 unset($parsed["host"]);
 527
 528                 $path = implode("/", $parsed);
 529
 530                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 531         }
 532
 533         /**
 534          * Creates an item post
 535          *
 536          * @param array $activity Activity data
 537          * @param array $item     item array
 538          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 539          * @throws \ImagickException
 540          */
 541         public static function postItem(array $activity, array $item)
 542         {
 543                 if (empty($item)) {
 544                         return;
 545                 }
 546
 547                 $stored = false;
 548                 ksort($activity['receiver']);
 549
 550                 foreach ($activity['receiver'] as $receiver) {
 551                         if ($receiver == -1) {
 552                                 continue;
 553                         }
 554
 555                         $item['uid'] = $receiver;
 556
 557                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 558                         switch($type) {
 559                                 case Receiver::TARGET_TO:
 560                                         $item['post-type'] = Item::PT_TO;
 561                                         break;
 562                                 case Receiver::TARGET_CC:
 563                                         $item['post-type'] = Item::PT_CC;
 564                                         break;
 565                                 case Receiver::TARGET_BTO:
 566                                         $item['post-type'] = Item::PT_BTO;
 567                                         break;
 568                                 case Receiver::TARGET_BCC:
 569                                         $item['post-type'] = Item::PT_BCC;
 570                                         break;
 571                                 case Receiver::TARGET_FOLLOWER:
 572                                         $item['post-type'] = Item::PT_FOLLOWER;
 573                                         break;
 574                                 case Receiver::TARGET_ANSWER:
 575                                         $item['post-type'] = Item::PT_COMMENT;
 576                                         break;
 577                                 case Receiver::TARGET_GLOBAL:
 578                                         $item['post-type'] = Item::PT_GLOBAL;
 579                                         break;
 580                                 default:
 581                                         $item['post-type'] = Item::PT_ARTICLE;
 582                         }
 583
 584                         if (!empty($activity['from-relay'])) {
 585                                 $item['post-type'] = Item::PT_RELAY;
 586                         } elseif (!empty($activity['thread-completion'])) {
 587                                 $item['post-type'] = Item::PT_FETCHED;
 588                         }
 589
 590                         if ($item['isForum'] ?? false) {
 591                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 592                         } else {
 593                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 594                         }
 595
 596                         if (($receiver != 0) && empty($item['contact-id'])) {
 597                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 598                         }
 599
 600                         if (!empty($activity['directmessage'])) {
 601                                 self::postMail($activity, $item);
 602                                 continue;
 603                         }
 604
 605                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 606                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 607
 608                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 609                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 610                                 }
 611
 612                                 if ($skip) {
 613                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 614                                         continue;
 615                                 }
 616
 617                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 618                         }
 619
 620                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 621                                 self::createEvent($activity, $item);
 622                         }
 623
 624                         $item_id = Item::insert($item);
 625                         if ($item_id) {
 626                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 627                         } else {
 628                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 629                         }
 630
 631                         if ($item['uid'] == 0) {
 632                                 $stored = $item_id;
 633                         }
 634                 }
 635
 636                 // Store send a follow request for every reshare - but only when the item had been stored
 637                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 638                         $author = APContact::getByURL($item['owner-link'], false);
 639                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 640                         if ($author['type'] != 'Group') {
 641                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 642                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 643                         }
 644                 }
 645         }
 646
 647         /**
 648          * Store tags and mentions into the tag table
 649          *
 650          * @param integer $uriid
 651          * @param array $tags
 652          */
 653         private static function storeTags(int $uriid, array $tags = null)
 654         {
 655                 foreach ($tags as $tag) {
 656                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 657                                 continue;
 658                         }
 659
 660                         $hash = substr($tag['name'], 0, 1);
 661
 662                         if ($tag['type'] == 'Mention') {
 663                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 664                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 665                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 666                                         $tag['name'] = substr($tag['name'], 1);
 667                                 }
 668                                 $type = Tag::IMPLICIT_MENTION;
 669
 670                                 if (!empty($tag['href'])) {
 671                                         $apcontact = APContact::getByURL($tag['href']);
 672                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 673                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 674                                         }
 675                                 }
 676                         } elseif ($tag['type'] == 'Hashtag') {
 677                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 678                                         $tag['name'] = substr($tag['name'], 1);
 679                                 }
 680                                 $type = Tag::HASHTAG;
 681                         }
 682
 683                         if (empty($tag['name'])) {
 684                                 continue;
 685                         }
 686
 687                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 688                 }
 689         }
 690
 691         /**
 692          * Creates an mail post
 693          *
 694          * @param array $activity Activity data
 695          * @param array $item     item array
 696          * @return int|bool New mail table row id or false on error
 697          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 698          */
 699         private static function postMail($activity, $item)
 700         {
 701                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 702                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 703                         return false;
 704                 }
 705
 706                 Logger::info('Direct Message', $item);
 707
 708                 $msg = [];
 709                 $msg['uid'] = $item['uid'];
 710
 711                 $msg['contact-id'] = $item['contact-id'];
 712
 713                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 714                 $msg['from-name'] = $contact['name'];
 715                 $msg['from-url'] = $contact['url'];
 716                 $msg['from-photo'] = $contact['photo'];
 717
 718                 $msg['uri'] = $item['uri'];
 719                 $msg['created'] = $item['created'];
 720
 721                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 722                 if (DBA::isResult($parent)) {
 723                         $msg['parent-uri'] = $parent['parent-uri'];
 724                         $msg['title'] = $parent['title'];
 725                 } else {
 726                         $msg['parent-uri'] = $item['thr-parent'];
 727
 728                         if (!empty($item['title'])) {
 729                                 $msg['title'] = $item['title'];
 730                         } elseif (!empty($item['content-warning'])) {
 731                                 $msg['title'] = $item['content-warning'];
 732                         } else {
 733                                 // Trying to generate a title out of the body
 734                                 $title = $item['body'];
 735
 736                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 737                                         $title = $matches[3];
 738                                 }
 739
 740                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 741
 742                                 if (strlen($title) > 20) {
 743                                         $title = substr($title, 0, 20) . '...';
 744                                 }
 745
 746                                 $msg['title'] = $title;
 747                         }
 748                 }
 749                 $msg['body'] = $item['body'];
 750
 751                 return Mail::insert($msg);
 752         }
 753
 754         /**
 755          * Fetches missing posts
 756          *
 757          * @param string $url         message URL
 758          * @param array  $child       activity array with the child of this message
 759          * @param string $relay_actor Relay actor
 760          * @return string fetched message URL
 761          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 762          */
 763         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
 764         {
 765                 if (!empty($child['receiver'])) {
 766                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 767                 } else {
 768                         $uid = 0;
 769                 }
 770
 771                 $object = ActivityPub::fetchContent($url, $uid);
 772                 if (empty($object)) {
 773                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 774                         return '';
 775                 }
 776
 777                 if (empty($object['id'])) {
 778                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 779                         return '';
 780                 }
 781
 782                 if (!empty($object['actor'])) {
 783                         $object_actor = $object['actor'];
 784                 } elseif (!empty($object['attributedTo'])) {
 785                         $object_actor = $object['attributedTo'];
 786                         if (is_array($object_actor)) {
 787                                 $compacted = JsonLD::compact($object);
 788                                 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
 789                         }
 790                 } else {
 791                         // Shouldn't happen
 792                         $object_actor = '';
 793                 }
 794
 795                 $signer = [$object_actor];
 796
 797                 if (!empty($child['author'])) {
 798                         $actor = $child['author'];
 799                         $signer[] = $actor;
 800                 } else {
 801                         $actor = $object_actor;
 802                 }
 803
 804                 if (!empty($object['published'])) {
 805                         $published = $object['published'];
 806                 } elseif (!empty($child['published'])) {
 807                         $published = $child['published'];
 808                 } else {
 809                         $published = DateTimeFormat::utcNow();
 810                 }
 811
 812                 $activity = [];
 813                 $activity['@context'] = $object['@context'];
 814                 unset($object['@context']);
 815                 $activity['id'] = $object['id'];
 816                 $activity['to'] = $object['to'] ?? [];
 817                 $activity['cc'] = $object['cc'] ?? [];
 818                 $activity['actor'] = $actor;
 819                 $activity['object'] = $object;
 820                 $activity['published'] = $published;
 821                 $activity['type'] = 'Create';
 822
 823                 $ldactivity = JsonLD::compact($activity);
 824
 825                 if (!empty($relay_actor)) {
 826                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
 827                 } elseif (!empty($child['thread-completion'])) {
 828                         $ldactivity['thread-completion'] = $child['thread-completion'];
 829                 } else {
 830                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
 831                 }
 832
 833                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
 834                         return '';
 835                 }
 836
 837                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
 838
 839                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 840
 841                 return $activity['id'];
 842         }
 843
 844         /**
 845          * Test if incoming relay messages should be accepted
 846          *
 847          * @param array $activity activity array
 848          * @param string $id      object ID
 849          * @return boolean true if message is accepted
 850          */
 851         private static function acceptIncomingMessage(array $activity, string $id)
 852         {
 853                 if (empty($activity['as:object'])) {
 854                         Logger::info('No object field in activity - accepted', ['id' => $id]);
 855                         return true;
 856                 }
 857
 858                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
 859                 if (Item::exists(['uri' => $replyto])) {
 860                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
 861                         return true;
 862                 }
 863
 864                 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
 865                 $authorid = Contact::getIdForURL($attributed_to);
 866
 867                 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
 868
 869                 $messageTags = [];
 870                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
 871                 if (!empty($tags)) {
 872                         foreach ($tags as $tag) {
 873                                 if ($tag['type'] != 'Hashtag') {
 874                                         continue;
 875                                 }
 876                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
 877                         }
 878                 }
 879
 880                 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
 881         }
 882
 883         /**
 884          * perform a "follow" request
 885          *
 886          * @param array $activity
 887          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 888          * @throws \ImagickException
 889          */
 890         public static function followUser($activity)
 891         {
 892                 $uid = User::getIdForURL($activity['object_id']);
 893                 if (empty($uid)) {
 894                         return;
 895                 }
 896
 897                 $owner = User::getOwnerDataById($uid);
 898                 if (empty($owner)) {
 899                         return;
 900                 }
 901
 902                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 903                 if (!empty($cid)) {
 904                         self::switchContact($cid);
 905                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 906                 }
 907
 908                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 909                         'author-link' => $activity['actor']];
 910
 911                 // Ensure that the contact has got the right network type
 912                 self::switchContact($item['author-id']);
 913
 914                 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
 915                 if ($result === true) {
 916                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 917                 }
 918
 919                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 920                 if (empty($cid)) {
 921                         return;
 922                 }
 923
 924                 if (empty($contact)) {
 925                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 926                 }
 927
 928                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 929         }
 930
 931         /**
 932          * Update the given profile
 933          *
 934          * @param array $activity
 935          * @throws \Exception
 936          */
 937         public static function updatePerson($activity)
 938         {
 939                 if (empty($activity['object_id'])) {
 940                         return;
 941                 }
 942
 943                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
 944                 Contact::updateFromProbeByURL($activity['object_id']);
 945         }
 946
 947         /**
 948          * Delete the given profile
 949          *
 950          * @param array $activity
 951          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 952          */
 953         public static function deletePerson($activity)
 954         {
 955                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 956                         Logger::info('Empty object id or actor.');
 957                         return;
 958                 }
 959
 960                 if ($activity['object_id'] != $activity['actor']) {
 961                         Logger::info('Object id does not match actor.');
 962                         return;
 963                 }
 964
 965                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 966                 while ($contact = DBA::fetch($contacts)) {
 967                         Contact::remove($contact['id']);
 968                 }
 969                 DBA::close($contacts);
 970
 971                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 972         }
 973
 974         /**
 975          * Accept a follow request
 976          *
 977          * @param array $activity
 978          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 979          * @throws \ImagickException
 980          */
 981         public static function acceptFollowUser($activity)
 982         {
 983                 $uid = User::getIdForURL($activity['object_actor']);
 984                 if (empty($uid)) {
 985                         return;
 986                 }
 987
 988                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 989                 if (empty($cid)) {
 990                         Logger::info('No contact found', ['actor' => $activity['actor']]);
 991                         return;
 992                 }
 993
 994                 self::switchContact($cid);
 995
 996                 $fields = ['pending' => false];
 997
 998                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
 999                 if ($contact['rel'] == Contact::FOLLOWER) {
1000                         $fields['rel'] = Contact::FRIEND;
1001                 }
1002
1003                 $condition = ['id' => $cid];
1004                 DBA::update('contact', $fields, $condition);
1005                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1006         }
1007
1008         /**
1009          * Reject a follow request
1010          *
1011          * @param array $activity
1012          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1013          * @throws \ImagickException
1014          */
1015         public static function rejectFollowUser($activity)
1016         {
1017                 $uid = User::getIdForURL($activity['object_actor']);
1018                 if (empty($uid)) {
1019                         return;
1020                 }
1021
1022                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1023                 if (empty($cid)) {
1024                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1025                         return;
1026                 }
1027
1028                 self::switchContact($cid);
1029
1030                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1031                         Contact::remove($cid);
1032                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1033                 } else {
1034                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1035                 }
1036         }
1037
1038         /**
1039          * Undo activity like "like" or "dislike"
1040          *
1041          * @param array $activity
1042          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1043          * @throws \ImagickException
1044          */
1045         public static function undoActivity($activity)
1046         {
1047                 if (empty($activity['object_id'])) {
1048                         return;
1049                 }
1050
1051                 if (empty($activity['object_actor'])) {
1052                         return;
1053                 }
1054
1055                 $author_id = Contact::getIdForURL($activity['object_actor']);
1056                 if (empty($author_id)) {
1057                         return;
1058                 }
1059
1060                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1061         }
1062
1063         /**
1064          * Activity to remove a follower
1065          *
1066          * @param array $activity
1067          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1068          * @throws \ImagickException
1069          */
1070         public static function undoFollowUser($activity)
1071         {
1072                 $uid = User::getIdForURL($activity['object_object']);
1073                 if (empty($uid)) {
1074                         return;
1075                 }
1076
1077                 $owner = User::getOwnerDataById($uid);
1078                 if (empty($owner)) {
1079                         return;
1080                 }
1081
1082                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1083                 if (empty($cid)) {
1084                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1085                         return;
1086                 }
1087
1088                 self::switchContact($cid);
1089
1090                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1091                 if (!DBA::isResult($contact)) {
1092                         return;
1093                 }
1094
1095                 Contact::removeFollower($owner, $contact);
1096                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1097         }
1098
1099         /**
1100          * Switches a contact to AP if needed
1101          *
1102          * @param integer $cid Contact ID
1103          * @throws \Exception
1104          */
1105         private static function switchContact($cid)
1106         {
1107                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1108                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1109                         return;
1110                 }
1111
1112                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1113                 Contact::updateFromProbe($cid);
1114         }
1115
1116         /**
1117          * Collects implicit mentions like:
1118          * - the author of the parent item
1119          * - all the mentioned conversants in the parent item
1120          *
1121          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1122          * @return array
1123          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1124          */
1125         private static function getImplicitMentionList(array $parent)
1126         {
1127                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1128
1129                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1130
1131                 $implicit_mentions = [];
1132                 if (empty($parent_author['url'])) {
1133                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1134                 } else {
1135                         $implicit_mentions[] = $parent_author['url'];
1136                         $implicit_mentions[] = $parent_author['nurl'];
1137                         $implicit_mentions[] = $parent_author['alias'];
1138                 }
1139
1140                 if (!empty($parent['alias'])) {
1141                         $implicit_mentions[] = $parent['alias'];
1142                 }
1143
1144                 foreach ($parent_terms as $term) {
1145                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1146                         if (!empty($contact['url'])) {
1147                                 $implicit_mentions[] = $contact['url'];
1148                                 $implicit_mentions[] = $contact['nurl'];
1149                                 $implicit_mentions[] = $contact['alias'];
1150                         }
1151                 }
1152
1153                 return $implicit_mentions;
1154         }
1155
1156         /**
1157          * Strips from the body prepended implicit mentions
1158          *
1159          * @param string $body
1160          * @param array $parent
1161          * @return string
1162          */
1163         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1164         {
1165                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1166                         return $body;
1167                 }
1168
1169                 $potential_mentions = self::getImplicitMentionList($parent);
1170
1171                 $kept_mentions = [];
1172
1173                 // Extract one prepended mention at a time from the body
1174                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1175                         if (!in_array($matches[2], $potential_mentions)) {
1176                                 $kept_mentions[] = $matches[1];
1177                         }
1178
1179                         $body = $matches[3];
1180                 }
1181
1182                 // Re-appending the kept mentions to the body after extraction
1183                 $kept_mentions[] = $body;
1184
1185                 return implode('', $kept_mentions);
1186         }
1187 }