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