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\Search;
  39 use Friendica\Model\Tag;
  40 use Friendica\Model\User;
  41 use Friendica\Protocol\Activity;
  42 use Friendica\Protocol\ActivityPub;
  43 use Friendica\Util\DateTimeFormat;
  44 use Friendica\Util\JsonLD;
  45 use Friendica\Util\Strings;
  46 use Text_LanguageDetect;
  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          * Add attachment data to the item array
  87          *
  88          * @param array   $activity
  89          * @param array   $item
  90          *
  91          * @return array array
  92          */
  93         private static function constructAttachList($activity, $item)
  94         {
  95                 if (empty($activity['attachments'])) {
  96                         return $item;
  97                 }
  98
  99                 foreach ($activity['attachments'] as $attach) {
 100                         switch ($attach['type']) {
 101                                 case 'link':
 102                                         $data = [
 103                                                 'url'      => $attach['url'],
 104                                                 'type'     => $attach['type'],
 105                                                 'title'    => $attach['title'] ?? '',
 106                                                 'text'     => $attach['desc']  ?? '',
 107                                                 'image'    => $attach['image'] ?? '',
 108                                                 'images'   => [],
 109                                                 'keywords' => [],
 110                                         ];
 111                                         $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
 112                                         break;
 113                                 default:
 114                                         $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
 115                                         if ($filetype == 'image') {
 116                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 117                                                         continue 2;
 118                                                 }
 119
 120                                                 $item['body'] .= "\n";
 121
 122                                                 // image is the preview/thumbnail URL
 123                                                 if (!empty($attach['image'])) {
 124                                                         $item['body'] .= '[url=' . $attach['url'] . ']';
 125                                                         $attach['url'] = $attach['image'];
 126                                                 }
 127
 128                                                 if (empty($attach['name'])) {
 129                                                         $item['body'] .= '[img]' . $attach['url'] . '[/img]';
 130                                                 } else {
 131                                                         $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
 132                                                 }
 133
 134                                                 if (!empty($attach['image'])) {
 135                                                         $item['body'] .= '[/url]';
 136                                                 }
 137                                         } elseif ($filetype == 'audio') {
 138                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 139                                                         continue 2;
 140                                                 }
 141
 142                                                 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
 143                                         } elseif ($filetype == 'video') {
 144                                                 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
 145                                                         continue 2;
 146                                                 }
 147
 148                                                 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
 149                                         } else {
 150                                                 if (!empty($item["attach"])) {
 151                                                         $item["attach"] .= ',';
 152                                                 } else {
 153                                                         $item["attach"] = '';
 154                                                 }
 155
 156                                                 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
 157                                         }
 158                         }
 159                 }
 160
 161                 return $item;
 162         }
 163
 164         /**
 165          * Updates a message
 166          *
 167          * @param array $activity Activity array
 168          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 169          */
 170         public static function updateItem($activity)
 171         {
 172                 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
 173                 if (!DBA::isResult($item)) {
 174                         Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
 175                         $item = self::createItem($activity);
 176                         self::postItem($activity, $item);
 177                         return;
 178                 }
 179
 180                 $item['changed'] = DateTimeFormat::utcNow();
 181                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 182
 183                 $item = self::processContent($activity, $item);
 184                 if (empty($item)) {
 185                         return;
 186                 }
 187
 188                 Item::update($item, ['uri' => $activity['id']]);
 189         }
 190
 191         /**
 192          * Prepares data for a message
 193          *
 194          * @param array $activity Activity array
 195          * @return array Internal item
 196          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 197          * @throws \ImagickException
 198          */
 199         public static function createItem($activity)
 200         {
 201                 $item = [];
 202                 $item['verb'] = Activity::POST;
 203                 $item['thr-parent'] = $activity['reply-to-id'];
 204
 205                 if ($activity['reply-to-id'] == $activity['id']) {
 206                         $item['gravity'] = GRAVITY_PARENT;
 207                         $item['object-type'] = Activity\ObjectType::NOTE;
 208                 } else {
 209                         $item['gravity'] = GRAVITY_COMMENT;
 210                         $item['object-type'] = Activity\ObjectType::COMMENT;
 211                 }
 212
 213                 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
 214                         Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
 215                         self::fetchMissingActivity($activity['reply-to-id'], $activity);
 216                 }
 217
 218                 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
 219
 220                 /// @todo What to do with $activity['context']?
 221                 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
 222                         Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
 223                         return [];
 224                 }
 225
 226                 $item['network'] = Protocol::ACTIVITYPUB;
 227                 $item['author-link'] = $activity['author'];
 228                 $item['author-id'] = Contact::getIdForURL($activity['author']);
 229                 $item['owner-link'] = $activity['actor'];
 230                 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
 231
 232                 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
 233                         $item['private'] = Item::UNLISTED;
 234                 } elseif (in_array(0, $activity['receiver'])) {
 235                         $item['private'] = Item::PUBLIC;
 236                 } else {
 237                         $item['private'] = Item::PRIVATE;
 238                 }
 239
 240                 if (!empty($activity['raw'])) {
 241                         $item['source'] = $activity['raw'];
 242                         $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
 243                         $item['conversation-href'] = $activity['context'] ?? '';
 244                         $item['conversation-uri'] = $activity['conversation'] ?? '';
 245
 246                         if (isset($activity['push'])) {
 247                                 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
 248                         }
 249                 }
 250
 251                 $item['isForum'] = false;
 252
 253                 if (!empty($activity['thread-completion'])) {
 254                         if ($activity['thread-completion'] != $item['owner-id']) {
 255                                 $actor = Contact::getById($activity['thread-completion'], ['url']);
 256                                 $item['causer-link'] = $actor['url'];
 257                                 $item['causer-id'] = $activity['thread-completion'];
 258                                 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
 259                         } else {
 260                                 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
 261                                 $item['causer-link'] = $item['owner-link'];
 262                                 $item['causer-id'] = $item['owner-id'];
 263                                 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
 264                         }
 265
 266                         $item['owner-link'] = $item['author-link'];
 267                         $item['owner-id'] = $item['author-id'];
 268                 } else {
 269                         $actor = APContact::getByURL($item['owner-link'], false);
 270                         $item['isForum'] = ($actor['type'] == 'Group');
 271                 }
 272
 273                 $item['uri'] = $activity['id'];
 274
 275                 $item['created'] = DateTimeFormat::utc($activity['published']);
 276                 $item['edited'] = DateTimeFormat::utc($activity['updated']);
 277                 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
 278                 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
 279
 280                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 281
 282                 $item = self::processContent($activity, $item);
 283                 if (empty($item)) {
 284                         Logger::info('Message was not processed');
 285                         return [];
 286                 }
 287
 288                 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
 289
 290                 $item = self::constructAttachList($activity, $item);
 291
 292                 return $item;
 293         }
 294
 295         /**
 296          * Delete items
 297          *
 298          * @param array $activity
 299          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 300          * @throws \ImagickException
 301          */
 302         public static function deleteItem($activity)
 303         {
 304                 $owner = Contact::getIdForURL($activity['actor']);
 305
 306                 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner'  => $owner]);
 307                 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
 308         }
 309
 310         /**
 311          * Prepare the item array for an activity
 312          *
 313          * @param array $activity Activity array
 314          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 315          * @throws \ImagickException
 316          */
 317         public static function addTag($activity)
 318         {
 319                 if (empty($activity['object_content']) || empty($activity['object_id'])) {
 320                         return;
 321                 }
 322
 323                 foreach ($activity['receiver'] as $receiver) {
 324                         $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
 325                         if (!DBA::isResult($item)) {
 326                                 // We don't fetch missing content for this purpose
 327                                 continue;
 328                         }
 329
 330                         if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
 331                                 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
 332                                 continue;
 333                         }
 334
 335                         Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
 336                         Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
 337                 }
 338         }
 339
 340         /**
 341          * Prepare the item array for an activity
 342          *
 343          * @param array  $activity Activity array
 344          * @param string $verb     Activity verb
 345          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 346          * @throws \ImagickException
 347          */
 348         public static function createActivity($activity, $verb)
 349         {
 350                 $item = self::createItem($activity);
 351                 $item['verb'] = $verb;
 352                 $item['thr-parent'] = $activity['object_id'];
 353                 $item['gravity'] = GRAVITY_ACTIVITY;
 354                 $item['object-type'] = Activity\ObjectType::NOTE;
 355
 356                 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
 357
 358                 self::postItem($activity, $item);
 359         }
 360
 361         /**
 362          * Create an event
 363          *
 364          * @param array $activity Activity array
 365          * @param array $item
 366          * @throws \Exception
 367          */
 368         public static function createEvent($activity, $item)
 369         {
 370                 $event['summary']  = HTML::toBBCode($activity['name']);
 371                 $event['desc']     = HTML::toBBCode($activity['content']);
 372                 $event['start']    = $activity['start-time'];
 373                 $event['finish']   = $activity['end-time'];
 374                 $event['nofinish'] = empty($event['finish']);
 375                 $event['location'] = $activity['location'];
 376                 $event['adjust']   = true;
 377                 $event['cid']      = $item['contact-id'];
 378                 $event['uid']      = $item['uid'];
 379                 $event['uri']      = $item['uri'];
 380                 $event['edited']   = $item['edited'];
 381                 $event['private']  = $item['private'];
 382                 $event['guid']     = $item['guid'];
 383                 $event['plink']    = $item['plink'];
 384
 385                 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
 386                 $ev = DBA::selectFirst('event', ['id'], $condition);
 387                 if (DBA::isResult($ev)) {
 388                         $event['id'] = $ev['id'];
 389                 }
 390
 391                 $event_id = Event::store($event);
 392                 Logger::info('Event was stored', ['id' => $event_id]);
 393         }
 394
 395         /**
 396          * Process the content
 397          *
 398          * @param array $activity Activity array
 399          * @param array $item
 400          * @return array|bool Returns the item array or false if there was an unexpected occurrence
 401          * @throws \Exception
 402          */
 403         private static function processContent($activity, $item)
 404         {
 405                 $item['title'] = HTML::toBBCode($activity['name']);
 406
 407                 if (!empty($activity['source'])) {
 408                         $item['body'] = $activity['source'];
 409                 } else {
 410                         $content = HTML::toBBCode($activity['content']);
 411
 412                         if (!empty($activity['emojis'])) {
 413                                 $content = self::replaceEmojis($content, $activity['emojis']);
 414                         }
 415
 416                         $content = self::convertMentions($content);
 417
 418                         if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
 419                                 $item_private = !in_array(0, $activity['item_receiver']);
 420                                 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
 421                                 if (!DBA::isResult($parent)) {
 422                                         Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
 423                                         return false;
 424                                 }
 425                                 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
 426                                         Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
 427                                         return false;
 428                                 }
 429
 430                                 $content = self::removeImplicitMentionsFromBody($content, $parent);
 431                         }
 432                         $item['content-warning'] = HTML::toBBCode($activity['summary']);
 433                         $item['body'] = $content;
 434                 }
 435
 436                 self::storeFromBody($item);
 437                 self::storeTags($item['uri-id'], $activity['tags']);
 438
 439                 $item['location'] = $activity['location'];
 440
 441                 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
 442                         $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
 443                 }
 444
 445                 $item['app'] = $activity['generator'];
 446
 447                 return $item;
 448         }
 449
 450         /**
 451          * Store hashtags and mentions
 452          *
 453          * @param array $item
 454          */
 455         private static function storeFromBody(array $item)
 456         {
 457                 // Make sure to delete all existing tags (can happen when called via the update functionality)
 458                 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
 459
 460                 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
 461         }
 462
 463         /**
 464          * Generate a GUID out of an URL
 465          *
 466          * @param string $url message URL
 467          * @return string with GUID
 468          */
 469         private static function getGUIDByURL(string $url)
 470         {
 471                 $parsed = parse_url($url);
 472
 473                 $host_hash = hash('crc32', $parsed['host']);
 474
 475                 unset($parsed["scheme"]);
 476                 unset($parsed["host"]);
 477
 478                 $path = implode("/", $parsed);
 479
 480                 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
 481         }
 482
 483         /**
 484          * Creates an item post
 485          *
 486          * @param array $activity Activity data
 487          * @param array $item     item array
 488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 489          * @throws \ImagickException
 490          */
 491         public static function postItem(array $activity, array $item)
 492         {
 493                 if (empty($item)) {
 494                         return;
 495                 }
 496
 497                 $stored = false;
 498                 ksort($activity['receiver']);
 499
 500                 foreach ($activity['receiver'] as $receiver) {
 501                         if ($receiver == -1) {
 502                                 continue;
 503                         }
 504
 505                         $item['uid'] = $receiver;
 506
 507                         $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
 508                         switch($type) {
 509                                 case Receiver::TARGET_TO:
 510                                         $item['post-type'] = Item::PT_TO;
 511                                         break;
 512                                 case Receiver::TARGET_CC:
 513                                         $item['post-type'] = Item::PT_CC;
 514                                         break;
 515                                 case Receiver::TARGET_BTO:
 516                                         $item['post-type'] = Item::PT_BTO;
 517                                         break;
 518                                 case Receiver::TARGET_BCC:
 519                                         $item['post-type'] = Item::PT_BCC;
 520                                         break;
 521                                 case Receiver::TARGET_FOLLOWER:
 522                                         $item['post-type'] = Item::PT_FOLLOWER;
 523                                         break;
 524                                 case Receiver::TARGET_ANSWER:
 525                                         $item['post-type'] = Item::PT_COMMENT;
 526                                         break;
 527                                 case Receiver::TARGET_GLOBAL:
 528                                         $item['post-type'] = Item::PT_GLOBAL;
 529                                         break;
 530                                 default:
 531                                         $item['post-type'] = Item::PT_ARTICLE;
 532                         }
 533
 534                         if (!empty($activity['from-relay'])) {
 535                                 $item['post-type'] = Item::PT_RELAY;
 536                         } elseif (!empty($activity['thread-completion'])) {
 537                                 $item['post-type'] = Item::PT_FETCHED;
 538                         }
 539
 540                         if ($item['isForum'] ?? false) {
 541                                 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
 542                         } else {
 543                                 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
 544                         }
 545
 546                         if (($receiver != 0) && empty($item['contact-id'])) {
 547                                 $item['contact-id'] = Contact::getIdForURL($activity['author']);
 548                         }
 549
 550                         if (!empty($activity['directmessage'])) {
 551                                 self::postMail($activity, $item);
 552                                 continue;
 553                         }
 554
 555                         if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
 556                                 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
 557
 558                                 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
 559                                         $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
 560                                 }
 561
 562                                 if ($skip) {
 563                                         Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
 564                                         continue;
 565                                 }
 566
 567                                 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
 568                         }
 569
 570                         if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
 571                                 self::createEvent($activity, $item);
 572                         }
 573
 574                         $item_id = Item::insert($item);
 575                         if ($item_id) {
 576                                 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
 577                         } else {
 578                                 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
 579                         }
 580
 581                         if ($item['uid'] == 0) {
 582                                 $stored = $item_id;
 583                         }
 584                 }
 585
 586                 // Store send a follow request for every reshare - but only when the item had been stored
 587                 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
 588                         $author = APContact::getByURL($item['owner-link'], false);
 589                         // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
 590                         if ($author['type'] != 'Group') {
 591                                 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
 592                                 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
 593                         }
 594                 }
 595         }
 596
 597         /**
 598          * Store tags and mentions into the tag table
 599          *
 600          * @param integer $uriid
 601          * @param array $tags
 602          */
 603         private static function storeTags(int $uriid, array $tags = null)
 604         {
 605                 foreach ($tags as $tag) {
 606                         if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 607                                 continue;
 608                         }
 609
 610                         $hash = substr($tag['name'], 0, 1);
 611
 612                         if ($tag['type'] == 'Mention') {
 613                                 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
 614                                         Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
 615                                         Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
 616                                         $tag['name'] = substr($tag['name'], 1);
 617                                 }
 618                                 $type = Tag::IMPLICIT_MENTION;
 619
 620                                 if (!empty($tag['href'])) {
 621                                         $apcontact = APContact::getByURL($tag['href']);
 622                                         if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
 623                                                 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
 624                                         }
 625                                 }
 626                         } elseif ($tag['type'] == 'Hashtag') {
 627                                 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
 628                                         $tag['name'] = substr($tag['name'], 1);
 629                                 }
 630                                 $type = Tag::HASHTAG;
 631                         }
 632
 633                         if (empty($tag['name'])) {
 634                                 continue;
 635                         }
 636
 637                         Tag::store($uriid, $type, $tag['name'], $tag['href']);
 638                 }
 639         }
 640
 641         /**
 642          * Creates an mail post
 643          *
 644          * @param array $activity Activity data
 645          * @param array $item     item array
 646          * @return int|bool New mail table row id or false on error
 647          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 648          */
 649         private static function postMail($activity, $item)
 650         {
 651                 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
 652                         Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
 653                         return false;
 654                 }
 655
 656                 Logger::info('Direct Message', $item);
 657
 658                 $msg = [];
 659                 $msg['uid'] = $item['uid'];
 660
 661                 $msg['contact-id'] = $item['contact-id'];
 662
 663                 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
 664                 $msg['from-name'] = $contact['name'];
 665                 $msg['from-url'] = $contact['url'];
 666                 $msg['from-photo'] = $contact['photo'];
 667
 668                 $msg['uri'] = $item['uri'];
 669                 $msg['created'] = $item['created'];
 670
 671                 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
 672                 if (DBA::isResult($parent)) {
 673                         $msg['parent-uri'] = $parent['parent-uri'];
 674                         $msg['title'] = $parent['title'];
 675                 } else {
 676                         $msg['parent-uri'] = $item['thr-parent'];
 677
 678                         if (!empty($item['title'])) {
 679                                 $msg['title'] = $item['title'];
 680                         } elseif (!empty($item['content-warning'])) {
 681                                 $msg['title'] = $item['content-warning'];
 682                         } else {
 683                                 // Trying to generate a title out of the body
 684                                 $title = $item['body'];
 685
 686                                 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
 687                                         $title = $matches[3];
 688                                 }
 689
 690                                 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
 691
 692                                 if (strlen($title) > 20) {
 693                                         $title = substr($title, 0, 20) . '...';
 694                                 }
 695
 696                                 $msg['title'] = $title;
 697                         }
 698                 }
 699                 $msg['body'] = $item['body'];
 700
 701                 return Mail::insert($msg);
 702         }
 703
 704         /**
 705          * Fetches missing posts
 706          *
 707          * @param string $url         message URL
 708          * @param array  $child       activity array with the child of this message
 709          * @param string $relay_actor Relay actor
 710          * @return string fetched message URL
 711          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 712          */
 713         public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
 714         {
 715                 if (!empty($child['receiver'])) {
 716                         $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
 717                 } else {
 718                         $uid = 0;
 719                 }
 720
 721                 $object = ActivityPub::fetchContent($url, $uid);
 722                 if (empty($object)) {
 723                         Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
 724                         return '';
 725                 }
 726
 727                 if (empty($object['id'])) {
 728                         Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
 729                         return '';
 730                 }
 731
 732                 if (!empty($object['actor'])) {
 733                         $object_actor = $object['actor'];
 734                 } elseif (!empty($object['attributedTo'])) {
 735                         $object_actor = $object['attributedTo'];
 736                 } else {
 737                         // Shouldn't happen
 738                         $object_actor = '';
 739                 }
 740
 741                 $signer = [$object_actor];
 742
 743                 if (!empty($child['author'])) {
 744                         $actor = $child['author'];
 745                         $signer[] = $actor;
 746                 } else {
 747                         $actor = $object_actor;
 748                 }
 749
 750                 if (!empty($object['published'])) {
 751                         $published = $object['published'];
 752                 } elseif (!empty($child['published'])) {
 753                         $published = $child['published'];
 754                 } else {
 755                         $published = DateTimeFormat::utcNow();
 756                 }
 757
 758                 $activity = [];
 759                 $activity['@context'] = $object['@context'];
 760                 unset($object['@context']);
 761                 $activity['id'] = $object['id'];
 762                 $activity['to'] = $object['to'] ?? [];
 763                 $activity['cc'] = $object['cc'] ?? [];
 764                 $activity['actor'] = $actor;
 765                 $activity['object'] = $object;
 766                 $activity['published'] = $published;
 767                 $activity['type'] = 'Create';
 768
 769                 $ldactivity = JsonLD::compact($activity);
 770
 771                 if (!empty($relay_actor)) {
 772                         $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
 773                 } elseif (!empty($child['thread-completion'])) {
 774                         $ldactivity['thread-completion'] = $child['thread-completion'];
 775                 } else {
 776                         $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
 777                 }
 778
 779                 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
 780                         return '';
 781                 }
 782
 783                 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
 784
 785                 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
 786
 787                 return $activity['id'];
 788         }
 789
 790         /**
 791          * Test if incoming relay messages should be accepted
 792          *
 793          * @param array $activity activity array
 794          * @param string $id      object ID
 795          * @return boolean true if message is accepted
 796          */
 797         private static function acceptIncomingMessage(array $activity, string $id)
 798         {
 799                 if (empty($activity['as:object'])) {
 800                         Logger::info('No object field in activity - accepted', ['id' => $id]);
 801                         return true;
 802                 }
 803
 804                 $config = DI::config();
 805
 806                 $subscribe = $config->get('system', 'relay_subscribe', false);
 807                 if ($subscribe) {
 808                         $scope = $config->get('system', 'relay_scope', SR_SCOPE_ALL);
 809                 } else {
 810                         $scope = SR_SCOPE_NONE;
 811                 }
 812
 813                 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
 814                 if (Item::exists(['uri' => $replyto])) {
 815                         Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
 816                         return true;
 817                 }
 818
 819                 if ($scope == SR_SCOPE_NONE) {
 820                         Logger::info('Server does not accept relay posts - rejected', ['id' => $id]);
 821                         return false;
 822                 }
 823
 824                 $messageTags = [];
 825                 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
 826                 if (!empty($tags)) {
 827                         foreach ($tags as $tag) {
 828                                 if ($tag['type'] != 'Hashtag') {
 829                                         continue;
 830                                 }
 831                                 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
 832                         }
 833                 }
 834
 835                 $systemTags = [];
 836                 $userTags = [];
 837                 $denyTags = [];
 838
 839                 if ($scope == SR_SCOPE_TAGS) {
 840                         $server_tags = $config->get('system', 'relay_server_tags');
 841                         $tagitems = explode(',', mb_strtolower($server_tags));
 842                         foreach ($tagitems AS $tag) {
 843                                 $systemTags[] = trim($tag, '# ');
 844                         }
 845
 846                         if ($config->get('system', 'relay_user_tags')) {
 847                                 $userTags = Search::getUserTags();
 848                         }
 849                 }
 850
 851                 $tagList = array_unique(array_merge($systemTags, $userTags));
 852
 853                 $deny_tags = $config->get('system', 'relay_deny_tags');
 854                 $tagitems = explode(',', mb_strtolower($deny_tags));
 855                 foreach ($tagitems AS $tag) {
 856                         $tag = trim($tag, '# ');
 857                         $denyTags[] = $tag;
 858                 }
 859
 860                 if (!empty($tagList) || !empty($denyTags)) {
 861                         $content = mb_strtolower(BBCode::toPlaintext(HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value')), false));
 862
 863                         foreach ($messageTags as $tag) {
 864                                 if (in_array($tag, $denyTags)) {
 865                                         Logger::info('Unwanted hashtag found - rejected', ['id' => $id, 'hashtag' => $tag]);
 866                                         return false;
 867                                 }
 868
 869                                 if (in_array($tag, $tagList)) {
 870                                         Logger::info('Subscribed hashtag found - accepted', ['id' => $id, 'hashtag' => $tag]);
 871                                         return true;
 872                                 }
 873
 874                                 // We check with "strpos" for performance issues. Only when this is true, the regular expression check is used
 875                                 // RegExp is taken from here: https://medium.com/@shiba1014/regex-word-boundaries-with-unicode-207794f6e7ed
 876                                 if ((strpos($content, $tag) !== false) && preg_match('/(?<=[\s,.:;"\']|^)' . preg_quote($tag, '/') . '(?=[\s,.:;"\']|$)/', $content)) {
 877                                         Logger::info('Subscribed hashtag found in content - accepted', ['id' => $id, 'hashtag' => $tag]);
 878                                         return true;
 879                                 }
 880                         }
 881                 }
 882
 883                 if ($scope == SR_SCOPE_ALL) {
 884                         Logger::info('Server accept all posts - accepted', ['id' => $id]);
 885                         return true;
 886                 }
 887
 888                 Logger::info('No matching hashtags found - rejected', ['id' => $id]);
 889                 return false;
 890         }
 891
 892         /**
 893          * perform a "follow" request
 894          *
 895          * @param array $activity
 896          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 897          * @throws \ImagickException
 898          */
 899         public static function followUser($activity)
 900         {
 901                 $uid = User::getIdForURL($activity['object_id']);
 902                 if (empty($uid)) {
 903                         return;
 904                 }
 905
 906                 $owner = User::getOwnerDataById($uid);
 907                 if (empty($owner)) {
 908                         return;
 909                 }
 910
 911                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 912                 if (!empty($cid)) {
 913                         self::switchContact($cid);
 914                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 915                         $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
 916                 } else {
 917                         $contact = [];
 918                 }
 919
 920                 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
 921                         'author-link' => $activity['actor']];
 922
 923                 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
 924
 925                 // Ensure that the contact has got the right network type
 926                 self::switchContact($item['author-id']);
 927
 928                 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
 929                 if ($result === true) {
 930                         ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
 931                 }
 932
 933                 $cid = Contact::getIdForURL($activity['actor'], $uid);
 934                 if (empty($cid)) {
 935                         return;
 936                 }
 937
 938                 if (empty($contact)) {
 939                         DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
 940                 }
 941
 942                 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
 943         }
 944
 945         /**
 946          * Update the given profile
 947          *
 948          * @param array $activity
 949          * @throws \Exception
 950          */
 951         public static function updatePerson($activity)
 952         {
 953                 if (empty($activity['object_id'])) {
 954                         return;
 955                 }
 956
 957                 Logger::info('Updating profile', ['object' => $activity['object_id']]);
 958                 Contact::updateFromProbeByURL($activity['object_id']);
 959         }
 960
 961         /**
 962          * Delete the given profile
 963          *
 964          * @param array $activity
 965          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 966          */
 967         public static function deletePerson($activity)
 968         {
 969                 if (empty($activity['object_id']) || empty($activity['actor'])) {
 970                         Logger::info('Empty object id or actor.');
 971                         return;
 972                 }
 973
 974                 if ($activity['object_id'] != $activity['actor']) {
 975                         Logger::info('Object id does not match actor.');
 976                         return;
 977                 }
 978
 979                 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
 980                 while ($contact = DBA::fetch($contacts)) {
 981                         Contact::remove($contact['id']);
 982                 }
 983                 DBA::close($contacts);
 984
 985                 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 986         }
 987
 988         /**
 989          * Accept a follow request
 990          *
 991          * @param array $activity
 992          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 993          * @throws \ImagickException
 994          */
 995         public static function acceptFollowUser($activity)
 996         {
 997                 $uid = User::getIdForURL($activity['object_actor']);
 998                 if (empty($uid)) {
 999                         return;
1000                 }
1001
1002                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1003                 if (empty($cid)) {
1004                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1005                         return;
1006                 }
1007
1008                 self::switchContact($cid);
1009
1010                 $fields = ['pending' => false];
1011
1012                 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1013                 if ($contact['rel'] == Contact::FOLLOWER) {
1014                         $fields['rel'] = Contact::FRIEND;
1015                 }
1016
1017                 $condition = ['id' => $cid];
1018                 DBA::update('contact', $fields, $condition);
1019                 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1020         }
1021
1022         /**
1023          * Reject a follow request
1024          *
1025          * @param array $activity
1026          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1027          * @throws \ImagickException
1028          */
1029         public static function rejectFollowUser($activity)
1030         {
1031                 $uid = User::getIdForURL($activity['object_actor']);
1032                 if (empty($uid)) {
1033                         return;
1034                 }
1035
1036                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1037                 if (empty($cid)) {
1038                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1039                         return;
1040                 }
1041
1042                 self::switchContact($cid);
1043
1044                 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1045                         Contact::remove($cid);
1046                         Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1047                 } else {
1048                         Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1049                 }
1050         }
1051
1052         /**
1053          * Undo activity like "like" or "dislike"
1054          *
1055          * @param array $activity
1056          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1057          * @throws \ImagickException
1058          */
1059         public static function undoActivity($activity)
1060         {
1061                 if (empty($activity['object_id'])) {
1062                         return;
1063                 }
1064
1065                 if (empty($activity['object_actor'])) {
1066                         return;
1067                 }
1068
1069                 $author_id = Contact::getIdForURL($activity['object_actor']);
1070                 if (empty($author_id)) {
1071                         return;
1072                 }
1073
1074                 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1075         }
1076
1077         /**
1078          * Activity to remove a follower
1079          *
1080          * @param array $activity
1081          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1082          * @throws \ImagickException
1083          */
1084         public static function undoFollowUser($activity)
1085         {
1086                 $uid = User::getIdForURL($activity['object_object']);
1087                 if (empty($uid)) {
1088                         return;
1089                 }
1090
1091                 $owner = User::getOwnerDataById($uid);
1092                 if (empty($owner)) {
1093                         return;
1094                 }
1095
1096                 $cid = Contact::getIdForURL($activity['actor'], $uid);
1097                 if (empty($cid)) {
1098                         Logger::info('No contact found', ['actor' => $activity['actor']]);
1099                         return;
1100                 }
1101
1102                 self::switchContact($cid);
1103
1104                 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1105                 if (!DBA::isResult($contact)) {
1106                         return;
1107                 }
1108
1109                 Contact::removeFollower($owner, $contact);
1110                 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1111         }
1112
1113         /**
1114          * Switches a contact to AP if needed
1115          *
1116          * @param integer $cid Contact ID
1117          * @throws \Exception
1118          */
1119         private static function switchContact($cid)
1120         {
1121                 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1122                 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1123                         return;
1124                 }
1125
1126                 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1127                 Contact::updateFromProbe($cid);
1128         }
1129
1130         /**
1131          * Collects implicit mentions like:
1132          * - the author of the parent item
1133          * - all the mentioned conversants in the parent item
1134          *
1135          * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1136          * @return array
1137          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1138          */
1139         private static function getImplicitMentionList(array $parent)
1140         {
1141                 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1142
1143                 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1144
1145                 $implicit_mentions = [];
1146                 if (empty($parent_author['url'])) {
1147                         Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1148                 } else {
1149                         $implicit_mentions[] = $parent_author['url'];
1150                         $implicit_mentions[] = $parent_author['nurl'];
1151                         $implicit_mentions[] = $parent_author['alias'];
1152                 }
1153
1154                 if (!empty($parent['alias'])) {
1155                         $implicit_mentions[] = $parent['alias'];
1156                 }
1157
1158                 foreach ($parent_terms as $term) {
1159                         $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1160                         if (!empty($contact['url'])) {
1161                                 $implicit_mentions[] = $contact['url'];
1162                                 $implicit_mentions[] = $contact['nurl'];
1163                                 $implicit_mentions[] = $contact['alias'];
1164                         }
1165                 }
1166
1167                 return $implicit_mentions;
1168         }
1169
1170         /**
1171          * Strips from the body prepended implicit mentions
1172          *
1173          * @param string $body
1174          * @param array $parent
1175          * @return string
1176          */
1177         private static function removeImplicitMentionsFromBody(string $body, array $parent)
1178         {
1179                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1180                         return $body;
1181                 }
1182
1183                 $potential_mentions = self::getImplicitMentionList($parent);
1184
1185                 $kept_mentions = [];
1186
1187                 // Extract one prepended mention at a time from the body
1188                 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1189                         if (!in_array($matches[2], $potential_mentions)) {
1190                                 $kept_mentions[] = $matches[1];
1191                         }
1192
1193                         $body = $matches[3];
1194                 }
1195
1196                 // Re-appending the kept mentions to the body after extraction
1197                 $kept_mentions[] = $body;
1198
1199                 return implode('', $kept_mentions);
1200         }
1201 }