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