src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Core\Cache\Enum\Duration;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\System;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Model\APContact;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\Conversation;
  35 use Friendica\Model\GServer;
  36 use Friendica\Model\Item;
  37 use Friendica\Model\Photo;
  38 use Friendica\Model\Post;
  39 use Friendica\Model\Tag;
  40 use Friendica\Model\User;
  41 use Friendica\Network\HTTPException;
  42 use Friendica\Protocol\Activity;
  43 use Friendica\Protocol\ActivityPub;
  44 use Friendica\Protocol\Relay;
  45 use Friendica\Util\DateTimeFormat;
  46 use Friendica\Util\HTTPSignature;
  47 use Friendica\Util\LDSignature;
  48 use Friendica\Util\Map;
  49 use Friendica\Util\Network;
  50 use Friendica\Util\Strings;
  51 use Friendica\Util\XML;
  52
  53 /**
  54  * ActivityPub Transmitter Protocol class
  55  *
  56  * To-Do:
  57  * @todo Undo Announce
  58  */
  59 class Transmitter
  60 {
  61         const CACHEKEY_FEATURED = 'transmitter:getFeatured:';
  62         const CACHEKEY_CONTACTS = 'transmitter:getContacts:';
  63         const CACHEKEY_OUTBOX   = 'transmitter:getOutbox:';
  64
  65         /**
  66          * Add relay servers to the list of inboxes
  67          *
  68          * @param array $inboxes
  69          * @return array inboxes with added relay servers
  70          */
  71         public static function addRelayServerInboxes(array $inboxes = [])
  72         {
  73                 foreach (Relay::getList(['inbox']) as $contact) {
  74                         $inboxes[$contact['inbox']] = $contact['inbox'];
  75                 }
  76
  77                 return $inboxes;
  78         }
  79
  80         /**
  81          * Add relay servers to the list of inboxes
  82          *
  83          * @param array $inboxes
  84          * @return array inboxes with added relay servers
  85          */
  86         public static function addRelayServerInboxesForItem(int $item_id, array $inboxes = [])
  87         {
  88                 $item = Post::selectFirst(['uid'], ['id' => $item_id]);
  89                 if (empty($item)) {
  90                         return $inboxes;
  91                 }
  92
  93                 $relays = Relay::getDirectRelayList($item_id);
  94                 if (empty($relays)) {
  95                         return $inboxes;
  96                 }
  97
  98                 foreach ($relays as $relay) {
  99                         $contact = Contact::getByURLForUser($relay['url'], $item['uid'], false, ['id']);
 100                         $inboxes[$relay['batch']][] = $contact['id'] ?? 0;
 101                 }
 102                 return $inboxes;
 103         }
 104
 105         /**
 106          * Subscribe to a relay
 107          *
 108          * @param string $url Subscribe actor url
 109          * @return bool success
 110          */
 111         public static function sendRelayFollow(string $url)
 112         {
 113                 $contact = Contact::getByURL($url);
 114                 if (empty($contact)) {
 115                         return false;
 116                 }
 117
 118                 $activity_id = ActivityPub\Transmitter::activityIDFromContact($contact['id']);
 119                 $success = ActivityPub\Transmitter::sendActivity('Follow', $url, 0, $activity_id);
 120                 if ($success) {
 121                         Contact::update(['rel' => Contact::FRIEND], ['id' => $contact['id']]);
 122                 }
 123
 124                 return $success;
 125         }
 126
 127         /**
 128          * Unsubscribe from a relay
 129          *
 130          * @param string $url   Subscribe actor url
 131          * @param bool   $force Set the relay status as non follower even if unsubscribe hadn't worked
 132          * @return bool success
 133          */
 134         public static function sendRelayUndoFollow(string $url, bool $force = false)
 135         {
 136                 $contact = Contact::getByURL($url);
 137                 if (empty($contact)) {
 138                         return false;
 139                 }
 140
 141                 $success = self::sendContactUndo($url, $contact['id'], 0);
 142                 if ($success || $force) {
 143                         Contact::update(['rel' => Contact::NOTHING], ['id' => $contact['id']]);
 144                 }
 145
 146                 return $success;
 147         }
 148
 149         /**
 150          * Collects a list of contacts of the given owner
 151          *
 152          * @param array   $owner     Owner array
 153          * @param array   $rel       The relevant value(s) contact.rel should match
 154          * @param string  $module    The name of the relevant AP endpoint module (followers|following)
 155          * @param integer $page      Page number
 156          * @param string  $requester URL of the requester
 157          * @param boolean $nocache   Wether to bypass caching
 158          *
 159          * @return array of owners
 160          * @throws \Exception
 161          */
 162         public static function getContacts(array $owner, array $rel, string $module, int $page = null, string $requester = null, $nocache = false)
 163         {
 164                 if (empty($page)) {
 165                         $cachekey = self::CACHEKEY_CONTACTS . $module . ':'. $owner['uid'];
 166                         $result = DI::cache()->get($cachekey);
 167                         if (!$nocache && !is_null($result)) {
 168                                 return $result;
 169                         }
 170                 }
 171
 172                 $parameters = [
 173                         'rel' => $rel,
 174                         'uid' => $owner['uid'],
 175                         'self' => false,
 176                         'deleted' => false,
 177                         'hidden' => false,
 178                         'archive' => false,
 179                         'pending' => false,
 180                         'blocked' => false,
 181                 ];
 182
 183                 $condition = DBA::mergeConditions($parameters, ["`url` IN (SELECT `url` FROM `apcontact`)"]);
 184
 185                 $total = DBA::count('contact', $condition);
 186
 187                 $modulePath = '/' . $module . '/';
 188
 189                 $data = ['@context' => ActivityPub::CONTEXT];
 190                 $data['id'] = DI::baseUrl() . $modulePath . $owner['nickname'];
 191                 $data['type'] = 'OrderedCollection';
 192                 $data['totalItems'] = $total;
 193
 194                 if (!empty($page)) {
 195                         $data['id'] .= '?' . http_build_query(['page' => $page]);
 196                 }
 197
 198                 // When we hide our friends we will only show the pure number but don't allow more.
 199                 $show_contacts = empty($owner['hide-friends']);
 200
 201                 // Allow fetching the contact list when the requester is part of the list.
 202                 if (($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) && !empty($requester)) {
 203                         $show_contacts = DBA::exists('contact', ['nurl' => Strings::normaliseLink($requester), 'uid' => $owner['uid'], 'blocked' => false]);
 204                 }
 205
 206                 if (!$show_contacts) {
 207                         if (!empty($cachekey)) {
 208                                 DI::cache()->set($cachekey, $data, Duration::DAY);
 209                         }
 210
 211                         return $data;
 212                 }
 213
 214                 if (empty($page)) {
 215                         $data['first'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=1';
 216                 } else {
 217                         $data['type'] = 'OrderedCollectionPage';
 218                         $list = [];
 219
 220                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 221                         while ($contact = DBA::fetch($contacts)) {
 222                                 $list[] = $contact['url'];
 223                         }
 224                         DBA::close($contacts);
 225
 226                         if (count($list) == 100) {
 227                                 $data['next'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=' . ($page + 1);
 228                         }
 229
 230                         $data['partOf'] = DI::baseUrl() . $modulePath . $owner['nickname'];
 231
 232                         $data['orderedItems'] = $list;
 233                 }
 234
 235                 if (!empty($cachekey)) {
 236                         DI::cache()->set($cachekey, $data, Duration::DAY);
 237                 }
 238
 239                 return $data;
 240         }
 241
 242         /**
 243          * Public posts for the given owner
 244          *
 245          * @param array   $owner     Owner array
 246          * @param integer $page      Page number
 247          * @param string  $requester URL of requesting account
 248          * @param boolean $nocache   Wether to bypass caching
 249          *
 250          * @return array of posts
 251          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 252          * @throws \ImagickException
 253          */
 254         public static function getOutbox(array $owner, int $page = null, string $requester = '', $nocache = false)
 255         {
 256                 if (empty($page)) {
 257                         $cachekey = self::CACHEKEY_OUTBOX . $owner['uid'];
 258                         $result = DI::cache()->get($cachekey);
 259                         if (!$nocache && !is_null($result)) {
 260                                 return $result;
 261                         }
 262                 }
 263
 264                 $condition = ['private' => [Item::PUBLIC, Item::UNLISTED]];
 265
 266                 if (!empty($requester)) {
 267                         $requester_id = Contact::getIdForURL($requester, $owner['uid']);
 268                         if (!empty($requester_id)) {
 269                                 $permissionSets = DI::permissionSet()->selectByContactId($requester_id, $owner['uid']);
 270                                 if (!empty($permissionSets)) {
 271                                         $condition = ['psid' => array_merge($permissionSets->column('id'),
 272                                                         [DI::permissionSet()->selectPublicForUser($owner['uid'])])];
 273                                 }
 274                         }
 275                 }
 276
 277                 $condition = array_merge($condition,
 278                         ['uid'           => $owner['uid'],
 279                         'author-id'      => Contact::getIdForURL($owner['url'], 0, false),
 280                         'gravity'        => [GRAVITY_PARENT, GRAVITY_COMMENT],
 281                         'network'        => Protocol::FEDERATED,
 282                         'parent-network' => Protocol::FEDERATED,
 283                         'origin'         => true,
 284                         'deleted'        => false,
 285                         'visible'        => true]);
 286
 287                 $count = Post::count($condition);
 288
 289                 $data = ['@context' => ActivityPub::CONTEXT];
 290                 $data['id'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 291                 $data['type'] = 'OrderedCollection';
 292                 $data['totalItems'] = $count;
 293
 294                 if (!empty($page)) {
 295                         $data['id'] .= '?' . http_build_query(['page' => $page]);
 296                 }
 297
 298                 if (empty($page)) {
 299                         $data['first'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 300                 } else {
 301                         $data['type'] = 'OrderedCollectionPage';
 302                         $list = [];
 303
 304                         $items = Post::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 305                         while ($item = Post::fetch($items)) {
 306                                 $activity = self::createActivityFromItem($item['id'], true);
 307                                 $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 308
 309                                 // Only list "Create" activity objects here, no reshares
 310                                 if (!empty($activity['object']) && ($activity['type'] == 'Create')) {
 311                                         $list[] = $activity['object'];
 312                                 }
 313                         }
 314                         DBA::close($items);
 315
 316                         if (count($list) == 20) {
 317                                 $data['next'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 318                         }
 319
 320                         $data['partOf'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 321
 322                         $data['orderedItems'] = $list;
 323                 }
 324
 325                 if (!empty($cachekey)) {
 326                         DI::cache()->set($cachekey, $data, Duration::DAY);
 327                 }
 328
 329                 return $data;
 330         }
 331
 332         /**
 333          * Public posts for the given owner
 334          *
 335          * @param array   $owner   Owner array
 336          * @param integer $page    Page number
 337          * @param boolean $nocache Wether to bypass caching
 338          *
 339          * @return array of posts
 340          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 341          * @throws \ImagickException
 342          */
 343         public static function getFeatured(array $owner, int $page = null, $nocache = false)
 344         {
 345                 if (empty($page)) {
 346                         $cachekey = self::CACHEKEY_FEATURED . $owner['uid'];
 347                         $result = DI::cache()->get($cachekey);
 348                         if (!$nocache && !is_null($result)) {
 349                                 return $result;
 350                         }
 351                 }
 352
 353                 $owner_cid = Contact::getIdForURL($owner['url'], 0, false);
 354
 355                 $condition = ["`uri-id` IN (SELECT `uri-id` FROM `collection-view` WHERE `cid` = ? AND `type` = ?)",
 356                         $owner_cid, Post\Collection::FEATURED];
 357
 358                 $condition = DBA::mergeConditions($condition,
 359                         ['uid'           => $owner['uid'],
 360                         'author-id'      => $owner_cid,
 361                         'private'        => [Item::PUBLIC, Item::UNLISTED],
 362                         'gravity'        => [GRAVITY_PARENT, GRAVITY_COMMENT],
 363                         'network'        => Protocol::FEDERATED,
 364                         'parent-network' => Protocol::FEDERATED,
 365                         'origin'         => true,
 366                         'deleted'        => false,
 367                         'visible'        => true]);
 368
 369                 $count = Post::count($condition);
 370
 371                 $data = ['@context' => ActivityPub::CONTEXT];
 372                 $data['id'] = DI::baseUrl() . '/featured/' . $owner['nickname'];
 373                 $data['type'] = 'OrderedCollection';
 374                 $data['totalItems'] = $count;
 375
 376                 if (!empty($page)) {
 377                         $data['id'] .= '?' . http_build_query(['page' => $page]);
 378                 }
 379
 380                 if (empty($page)) {
 381                         $items = Post::select(['id'], $condition, ['limit' => 20, 'order' => ['created' => true]]);
 382                 } else {
 383                         $data['type'] = 'OrderedCollectionPage';
 384                         $items = Post::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 385                 }
 386                 $list = [];
 387
 388                 while ($item = Post::fetch($items)) {
 389                         $activity = self::createActivityFromItem($item['id'], true);
 390                         $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 391
 392                         // Only list "Create" activity objects here, no reshares
 393                         if (!empty($activity['object']) && ($activity['type'] == 'Create')) {
 394                                 $list[] = $activity['object'];
 395                         }
 396                 }
 397                 DBA::close($items);
 398
 399                 if (count($list) == 20) {
 400                         $data['next'] = DI::baseUrl() . '/featured/' . $owner['nickname'] . '?page=' . ($page + 1);
 401                 }
 402
 403                 if (!empty($page)) {
 404                         $data['partOf'] = DI::baseUrl() . '/featured/' . $owner['nickname'];
 405                 }
 406
 407                 $data['orderedItems'] = $list;
 408
 409                 if (!empty($cachekey)) {
 410                         DI::cache()->set($cachekey, $data, Duration::DAY);
 411                 }
 412
 413                 return $data;
 414         }
 415
 416         /**
 417          * Return the service array containing information the used software and it's url
 418          *
 419          * @return array with service data
 420          */
 421         private static function getService()
 422         {
 423                 return ['type' => 'Service',
 424                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 425                         'url' => DI::baseUrl()->get()];
 426         }
 427
 428         /**
 429          * Return the ActivityPub profile of the given user
 430          *
 431          * @param int $uid User ID
 432          * @return array with profile data
 433          * @throws HTTPException\NotFoundException
 434          * @throws HTTPException\InternalServerErrorException
 435          */
 436         public static function getProfile(int $uid): array
 437         {
 438                 $owner = User::getOwnerDataById($uid);
 439                 if (!isset($owner['id'])) {
 440                         DI::logger()->error('Unable to find owner data for uid', ['uid' => $uid, 'callstack' => System::callstack(20)]);
 441                         throw new HTTPException\NotFoundException('User not found.');
 442                 }
 443
 444                 $data = ['@context' => ActivityPub::CONTEXT];
 445                 $data['id'] = $owner['url'];
 446
 447                 if (!empty($owner['guid'])) {
 448                         $data['diaspora:guid'] = $owner['guid'];
 449                 }
 450
 451                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$owner['account-type']];
 452
 453                 if ($uid != 0) {
 454                         $data['following'] = DI::baseUrl() . '/following/' . $owner['nick'];
 455                         $data['followers'] = DI::baseUrl() . '/followers/' . $owner['nick'];
 456                         $data['inbox']     = DI::baseUrl() . '/inbox/' . $owner['nick'];
 457                         $data['outbox']    = DI::baseUrl() . '/outbox/' . $owner['nick'];
 458                         $data['featured']  = DI::baseUrl() . '/featured/' . $owner['nick'];
 459                 } else {
 460                         $data['inbox'] = DI::baseUrl() . '/friendica/inbox';
 461                 }
 462
 463                 $data['preferredUsername'] = $owner['nick'];
 464                 $data['name'] = $owner['name'];
 465
 466                 if (!empty($owner['country-name'] . $owner['region'] . $owner['locality'])) {
 467                         $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $owner['country-name'],
 468                                 'vcard:region' => $owner['region'], 'vcard:locality' => $owner['locality']];
 469                 }
 470
 471                 if (!empty($owner['about'])) {
 472                         $data['summary'] = BBCode::convertForUriId($owner['uri-id'] ?? 0, $owner['about'], BBCode::EXTERNAL);
 473                 }
 474
 475                 if (!empty($owner['xmpp']) || !empty($owner['matrix'])) {
 476                         $data['vcard:hasInstantMessage'] = [];
 477
 478                         if (!empty($owner['xmpp'])) {
 479                                 $data['vcard:hasInstantMessage'][] = 'xmpp:' . $owner['xmpp'];
 480                         }
 481                         if (!empty($owner['matrix'])) {
 482                                 $data['vcard:hasInstantMessage'][] = 'matrix:' . $owner['matrix'];
 483                         }
 484                 }
 485
 486                 $data['url'] = $owner['url'];
 487                 $data['manuallyApprovesFollowers'] = in_array($owner['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 488                 $data['discoverable'] = (bool)$owner['net-publish'];
 489                 $data['publicKey'] = ['id' => $owner['url'] . '#main-key',
 490                         'owner' => $owner['url'],
 491                         'publicKeyPem' => $owner['pubkey']];
 492                 $data['endpoints'] = ['sharedInbox' => DI::baseUrl() . '/inbox'];
 493                 $data['icon'] = ['type' => 'Image', 'url' => User::getAvatarUrl($owner)];
 494
 495                 $resourceid = Photo::ridFromURI($owner['photo']);
 496                 if (!empty($resourceid)) {
 497                         $photo = Photo::selectFirst(['type'], ["resource-id" => $resourceid]);
 498                         if (!empty($photo['type'])) {
 499                                 $data['icon']['mediaType'] = $photo['type'];
 500                         }
 501                 }
 502
 503                 if (!empty($owner['header'])) {
 504                         $data['image'] = ['type' => 'Image', 'url' => Contact::getHeaderUrlForId($owner['id'], '', $owner['updated'])];
 505
 506                         $resourceid = Photo::ridFromURI($owner['header']);
 507                         if (!empty($resourceid)) {
 508                                 $photo = Photo::selectFirst(['type'], ["resource-id" => $resourceid]);
 509                                 if (!empty($photo['type'])) {
 510                                         $data['image']['mediaType'] = $photo['type'];
 511                                 }
 512                         }
 513                 }
 514
 515                 $custom_fields = [];
 516
 517                 foreach (DI::profileField()->selectByContactId(0, $uid) as $profile_field) {
 518                         $custom_fields[] = [
 519                                 'type' => 'PropertyValue',
 520                                 'name' => $profile_field->label,
 521                                 'value' => BBCode::convertForUriId($owner['uri-id'], $profile_field->value)
 522                         ];
 523                 };
 524
 525                 if (!empty($custom_fields)) {
 526                         $data['attachment'] = $custom_fields;
 527                 }
 528
 529                 $data['generator'] = self::getService();
 530
 531                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 532                 return $data;
 533         }
 534
 535         /**
 536          * @param string $username
 537          * @return array
 538          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 539          */
 540         public static function getDeletedUser($username)
 541         {
 542                 return [
 543                         '@context' => ActivityPub::CONTEXT,
 544                         'id' => DI::baseUrl() . '/profile/' . $username,
 545                         'type' => 'Tombstone',
 546                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 547                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 548                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 549                 ];
 550         }
 551
 552         /**
 553          * Returns an array with permissions of the thread parent of the given item array
 554          *
 555          * @param array $item
 556          * @param bool  $is_forum_thread
 557          *
 558          * @return array with permissions
 559          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 560          * @throws \ImagickException
 561          */
 562         private static function fetchPermissionBlockFromThreadParent(array $item, bool $is_forum_thread)
 563         {
 564                 if (empty($item['thr-parent-id'])) {
 565                         return [];
 566                 }
 567
 568                 $parent = Post::selectFirstPost(['author-link'], ['uri-id' => $item['thr-parent-id']]);
 569                 if (empty($parent)) {
 570                         return [];
 571                 }
 572
 573                 $permissions = [
 574                         'to' => [$parent['author-link']],
 575                         'cc' => [],
 576                         'bto' => [],
 577                         'bcc' => [],
 578                 ];
 579
 580                 $parent_profile = APContact::getByURL($parent['author-link']);
 581
 582                 $item_profile = APContact::getByURL($item['author-link']);
 583                 $exclude[] = $item['author-link'];
 584
 585                 if ($item['gravity'] == GRAVITY_PARENT) {
 586                         $exclude[] = $item['owner-link'];
 587                 }
 588
 589                 $type = [Tag::TO => 'to', Tag::CC => 'cc', Tag::BTO => 'bto', Tag::BCC => 'bcc'];
 590                 foreach (Tag::getByURIId($item['thr-parent-id'], [Tag::TO, Tag::CC, Tag::BTO, Tag::BCC]) as $receiver) {
 591                         if (!empty($parent_profile['followers']) && $receiver['url'] == $parent_profile['followers'] && !empty($item_profile['followers'])) {
 592                                 if (!$is_forum_thread) {
 593                                         $permissions[$type[$receiver['type']]][] = $item_profile['followers'];
 594                                 }
 595                         } elseif (!in_array($receiver['url'], $exclude)) {
 596                                 $permissions[$type[$receiver['type']]][] = $receiver['url'];
 597                         }
 598                 }
 599
 600                 return $permissions;
 601         }
 602
 603         /**
 604          * Check if the given item id is from ActivityPub
 605          *
 606          * @param integer $item_id
 607          * @return boolean "true" if the post is from ActivityPub
 608          */
 609         private static function isAPPost(int $item_id)
 610         {
 611                 if (empty($item_id)) {
 612                         return false;
 613                 }
 614
 615                 return Post::exists(['id' => $item_id, 'network' => Protocol::ACTIVITYPUB]);
 616         }
 617
 618         /**
 619          * Creates an array of permissions from an item thread
 620          *
 621          * @param array   $item      Item array
 622          * @param boolean $blindcopy addressing via "bcc" or "cc"?
 623          * @param integer $last_id   Last item id for adding receivers
 624          *
 625          * @return array with permission data
 626          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 627          * @throws \ImagickException
 628          */
 629         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0)
 630         {
 631                 if ($last_id == 0) {
 632                         $last_id = $item['id'];
 633                 }
 634
 635                 $always_bcc = false;
 636                 $is_forum   = false;
 637                 $follower   = '';
 638
 639                 // Check if we should always deliver our stuff via BCC
 640                 if (!empty($item['uid'])) {
 641                         $owner = User::getOwnerDataById($item['uid']);
 642                         if (!empty($owner)) {
 643                                 $always_bcc = $owner['hide-friends'];
 644                                 $is_forum   = ($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && $owner['manually-approve'];
 645
 646                                 $profile  = APContact::getByURL($owner['url'], false);
 647                                 $follower = $profile['followers'] ?? '';
 648                         }
 649                 }
 650
 651                 if (DI::config()->get('system', 'ap_always_bcc')) {
 652                         $always_bcc = true;
 653                 }
 654
 655                 $parent = Post::selectFirst(['causer-link', 'post-reason'], ['id' => $item['parent']]);
 656                 if (($parent['post-reason'] == Item::PR_ANNOUNCEMENT) && !empty($parent['causer-link'])) {
 657                         $profile = APContact::getByURL($parent['causer-link'], false);
 658                         $is_forum_thread = isset($profile['type']) && $profile['type'] == 'Group';
 659                 } else {
 660                         $is_forum_thread = false;
 661                 }
 662
 663                 if (self::isAnnounce($item) || DI::config()->get('debug', 'total_ap_delivery') || self::isAPPost($last_id)) {
 664                         // Will be activated in a later step
 665                         $networks = Protocol::FEDERATED;
 666                 } else {
 667                         // For now only send to these contacts:
 668                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 669                 }
 670
 671                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 672
 673                 if ($item['gravity'] == GRAVITY_PARENT) {
 674                         $actor_profile = APContact::getByURL($item['owner-link']);
 675                 } else {
 676                         $actor_profile = APContact::getByURL($item['author-link']);
 677                 }
 678
 679                 $exclusive = false;
 680
 681                 $terms = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 682
 683                 if ($item['private'] != Item::PRIVATE) {
 684                         // Directly mention the original author upon a quoted reshare.
 685                         // Else just ensure that the original author receives the reshare.
 686                         $announce = self::getAnnounceArray($item);
 687                         if (!empty($announce['comment'])) {
 688                                 $data['to'][] = $announce['actor']['url'];
 689                         } elseif (!empty($announce)) {
 690                                 $data['cc'][] = $announce['actor']['url'];
 691                         }
 692
 693                         $data = array_merge($data, self::fetchPermissionBlockFromThreadParent($item, $is_forum_thread));
 694
 695                         // Check if the item is completely public or unlisted
 696                         if ($item['private'] == Item::PUBLIC) {
 697                                 $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 698                         } else {
 699                                 $data['cc'][] = ActivityPub::PUBLIC_COLLECTION;
 700                         }
 701
 702                         foreach ($terms as $term) {
 703                                 $profile = APContact::getByURL($term['url'], false);
 704                                 if (!empty($profile)) {
 705                                         if ($term['type'] == Tag::EXCLUSIVE_MENTION) {
 706                                                 $exclusive = true;
 707                                                 if (!empty($profile['followers']) && ($profile['type'] == 'Group')) {
 708                                                         $data['cc'][] = $profile['followers'];
 709                                                 }
 710                                         }
 711                                         $data['to'][] = $profile['url'];
 712                                 }
 713                         }
 714                 } else {
 715                         $receiver_list = Item::enumeratePermissions($item, true);
 716
 717                         foreach ($terms as $term) {
 718                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 719                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 720                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol', 'gsid'], ['id' => $cid, 'network' => Protocol::FEDERATED]);
 721                                         if (!DBA::isResult($contact) || !self::isAPContact($contact, $networks)) {
 722                                                 continue;
 723                                         }
 724
 725                                         $profile = APContact::getByURL($term['url'], false);
 726                                         if (!empty($profile)) {
 727                                                 if ($term['type'] == Tag::EXCLUSIVE_MENTION) {
 728                                                         $exclusive = true;
 729                                                         if (!empty($profile['followers']) && ($profile['type'] == 'Group')) {
 730                                                                 $data['cc'][] = $profile['followers'];
 731                                                         }
 732                                                 }
 733                                                 $data['to'][] = $profile['url'];
 734                                         }
 735                                 }
 736                         }
 737
 738                         if ($is_forum && !$exclusive && !empty($follower)) {
 739                                 $data['cc'][] = $follower;
 740                         } elseif (!$exclusive) {
 741                                 foreach ($receiver_list as $receiver) {
 742                                         $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol', 'gsid'], ['id' => $receiver, 'network' => Protocol::FEDERATED]);
 743                                         if (!DBA::isResult($contact) || !self::isAPContact($contact, $networks)) {
 744                                                 continue;
 745                                         }
 746
 747                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 748                                                 if ($contact['hidden'] || $always_bcc) {
 749                                                         $data['bcc'][] = $profile['url'];
 750                                                 } else {
 751                                                         $data['cc'][] = $profile['url'];
 752                                                 }
 753                                         }
 754                                 }
 755                         }
 756                 }
 757
 758                 if (!empty($item['parent'])) {
 759                         $parents = Post::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']], ['order' => ['id']]);
 760                         while ($parent = Post::fetch($parents)) {
 761                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 762                                         $profile = APContact::getByURL($parent['owner-link'], false);
 763                                         if (!empty($profile)) {
 764                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 765                                                         // Comments to forums are directed to the forum
 766                                                         // But comments to forums aren't directed to the followers collection
 767                                                         // This rule is only valid when the actor isn't the forum.
 768                                                         // The forum needs to transmit their content to their followers.
 769                                                         if (($profile['type'] == 'Group') && ($profile['url'] != ($actor_profile['url'] ?? ''))) {
 770                                                                 $data['to'][] = $profile['url'];
 771                                                         } else {
 772                                                                 $data['cc'][] = $profile['url'];
 773                                                                 if (($item['private'] != Item::PRIVATE) && !empty($actor_profile['followers'])&& !$is_forum_thread) {
 774                                                                         $data['cc'][] = $actor_profile['followers'];
 775                                                                 }
 776                                                         }
 777                                                 } elseif (!$exclusive && !$is_forum_thread) {
 778                                                         // Public thread parent post always are directed to the followers.
 779                                                         if ($item['private'] != Item::PRIVATE) {
 780                                                                 $data['cc'][] = $actor_profile['followers'];
 781                                                         }
 782                                                 }
 783                                         }
 784                                 }
 785
 786                                 // Don't include data from future posts
 787                                 if ($parent['id'] >= $last_id) {
 788                                         continue;
 789                                 }
 790
 791                                 $profile = APContact::getByURL($parent['author-link'], false);
 792                                 if (!empty($profile)) {
 793                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 794                                                 $data['to'][] = $profile['url'];
 795                                         } else {
 796                                                 $data['cc'][] = $profile['url'];
 797                                         }
 798                                 }
 799                         }
 800                         DBA::close($parents);
 801                 }
 802
 803                 $data['to'] = array_unique($data['to']);
 804                 $data['cc'] = array_unique($data['cc']);
 805                 $data['bcc'] = array_unique($data['bcc']);
 806
 807                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 808                         unset($data['to'][$key]);
 809                 }
 810
 811                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 812                         unset($data['cc'][$key]);
 813                 }
 814
 815                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 816                         unset($data['bcc'][$key]);
 817                 }
 818
 819                 foreach ($data['to'] as $to) {
 820                         if (($key = array_search($to, $data['cc'])) !== false) {
 821                                 unset($data['cc'][$key]);
 822                         }
 823
 824                         if (($key = array_search($to, $data['bcc'])) !== false) {
 825                                 unset($data['bcc'][$key]);
 826                         }
 827                 }
 828
 829                 foreach ($data['cc'] as $cc) {
 830                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 831                                 unset($data['bcc'][$key]);
 832                         }
 833                 }
 834
 835                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 836
 837                 if (!$blindcopy) {
 838                         unset($receivers['bcc']);
 839                 }
 840
 841                 foreach (['to' => Tag::TO, 'cc' => Tag::CC, 'bcc' => Tag::BCC] as $element => $type) {
 842                         if (!empty($receivers[$element])) {
 843                                 foreach ($receivers[$element] as $receiver) {
 844                                         if ($receiver == ActivityPub::PUBLIC_COLLECTION) {
 845                                                 $name = Receiver::PUBLIC_COLLECTION;
 846                                         } else {
 847                                                 $name = trim(parse_url($receiver, PHP_URL_PATH), '/');
 848                                         }
 849                                         Tag::store($item['uri-id'], $type, $name, $receiver);
 850                                 }
 851                         }
 852                 }
 853
 854                 return $receivers;
 855         }
 856
 857         /**
 858          * Check if an inbox is archived
 859          *
 860          * @param string $url Inbox url
 861          *
 862          * @return boolean "true" if inbox is archived
 863          */
 864         public static function archivedInbox($url)
 865         {
 866                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 867         }
 868
 869         /**
 870          * Check if a given contact should be delivered via AP
 871          *
 872          * @param array $contact
 873          * @param array $networks
 874          * @return bool
 875          * @throws Exception
 876          */
 877         private static function isAPContact(array $contact, array $networks)
 878         {
 879                 if (in_array($contact['network'], $networks) || ($contact['protocol'] == Protocol::ACTIVITYPUB)) {
 880                         return true;
 881                 }
 882
 883                 return GServer::getProtocol($contact['gsid'] ?? 0) == Post\DeliveryData::ACTIVITYPUB;
 884         }
 885
 886         /**
 887          * Fetches a list of inboxes of followers of a given user
 888          *
 889          * @param integer $uid      User ID
 890          * @param boolean $personal fetch personal inboxes
 891          * @param boolean $all_ap   Retrieve all AP enabled inboxes
 892          *
 893          * @return array of follower inboxes
 894          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 895          * @throws \ImagickException
 896          */
 897         public static function fetchTargetInboxesforUser($uid, $personal = false, bool $all_ap = false)
 898         {
 899                 $inboxes = [];
 900
 901                 $isforum = false;
 902
 903                 if (!empty($item['uid'])) {
 904                         $profile = User::getOwnerDataById($item['uid']);
 905                         if (!empty($profile)) {
 906                                 $isforum = $profile['account-type'] == User::ACCOUNT_TYPE_COMMUNITY;
 907                         }
 908                 }
 909
 910                 if (DI::config()->get('debug', 'total_ap_delivery') || $all_ap) {
 911                         // Will be activated in a later step
 912                         $networks = Protocol::FEDERATED;
 913                 } else {
 914                         // For now only send to these contacts:
 915                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 916                 }
 917
 918                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false, 'blocked' => false, 'network' => Protocol::FEDERATED];
 919
 920                 if (!empty($uid)) {
 921                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 922                 }
 923
 924                 $contacts = DBA::select('contact', ['id', 'url', 'network', 'protocol', 'gsid'], $condition);
 925                 while ($contact = DBA::fetch($contacts)) {
 926                         if (!self::isAPContact($contact, $networks)) {
 927                                 continue;
 928                         }
 929
 930                         if ($isforum && ($contact['network'] == Protocol::DFRN)) {
 931                                 continue;
 932                         }
 933
 934                         if (Network::isUrlBlocked($contact['url'])) {
 935                                 continue;
 936                         }
 937
 938                         $profile = APContact::getByURL($contact['url'], false);
 939                         if (!empty($profile)) {
 940                                 if (empty($profile['sharedinbox']) || $personal || Contact::isLocal($contact['url'])) {
 941                                         $target = $profile['inbox'];
 942                                 } else {
 943                                         $target = $profile['sharedinbox'];
 944                                 }
 945                                 if (!self::archivedInbox($target)) {
 946                                         $inboxes[$target][] = $contact['id'];
 947                                 }
 948                         }
 949                 }
 950                 DBA::close($contacts);
 951
 952                 return $inboxes;
 953         }
 954
 955         /**
 956          * Fetches an array of inboxes for the given item and user
 957          *
 958          * @param array   $item     Item array
 959          * @param integer $uid      User ID
 960          * @param boolean $personal fetch personal inboxes
 961          * @param integer $last_id  Last item id for adding receivers
 962          * @return array with inboxes
 963          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 964          * @throws \ImagickException
 965          */
 966         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0)
 967         {
 968                 $permissions = self::createPermissionBlockForItem($item, true, $last_id);
 969                 if (empty($permissions)) {
 970                         return [];
 971                 }
 972
 973                 $inboxes = [];
 974
 975                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 976                         $item_profile = APContact::getByURL($item['author-link'], false);
 977                 } else {
 978                         $item_profile = APContact::getByURL($item['owner-link'], false);
 979                 }
 980
 981                 if (empty($item_profile)) {
 982                         return [];
 983                 }
 984
 985                 $profile_uid = User::getIdForURL($item_profile['url']);
 986
 987                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 988                         if (empty($permissions[$element])) {
 989                                 continue;
 990                         }
 991
 992                         $blindcopy = in_array($element, ['bto', 'bcc']);
 993
 994                         foreach ($permissions[$element] as $receiver) {
 995                                 if (empty($receiver) || Network::isUrlBlocked($receiver)) {
 996                                         continue;
 997                                 }
 998
 999                                 if ($item_profile && ($receiver == $item_profile['followers']) && ($uid == $profile_uid)) {
1000                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal, self::isAPPost($last_id)));
1001                                 } else {
1002                                         $profile = APContact::getByURL($receiver, false);
1003                                         if (!empty($profile)) {
1004                                                 $contact = Contact::getByURLForUser($receiver, $uid, false, ['id']);
1005
1006                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy || Contact::isLocal($receiver)) {
1007                                                         $target = $profile['inbox'];
1008                                                 } else {
1009                                                         $target = $profile['sharedinbox'];
1010                                                 }
1011                                                 if (!self::archivedInbox($target)) {
1012                                                         $inboxes[$target][] = $contact['id'] ?? 0;
1013                                                 }
1014                                         }
1015                                 }
1016                         }
1017                 }
1018
1019                 return $inboxes;
1020         }
1021
1022         /**
1023          * Creates an array in the structure of the item table for a given mail id
1024          *
1025          * @param integer $mail_id
1026          *
1027          * @return array
1028          * @throws \Exception
1029          */
1030         public static function ItemArrayFromMail($mail_id, $use_title = false)
1031         {
1032                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
1033                 if (!DBA::isResult($mail)) {
1034                         return [];
1035                 }
1036
1037                 $reply = DBA::selectFirst('mail', ['uri', 'uri-id', 'from-url'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
1038                 if (!DBA::isResult($reply)) {
1039                         $reply = $mail;
1040                 }
1041
1042                 // Making the post more compatible for Mastodon by:
1043                 // - Making it a note and not an article (no title)
1044                 // - Moving the title into the "summary" field that is used as a "content warning"
1045
1046                 if (!$use_title) {
1047                         $mail['body']         = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
1048                         $mail['title']        = '';
1049                 }
1050
1051                 $mail['content-warning']  = '';
1052                 $mail['author-link']      = $mail['owner-link'] = $mail['from-url'];
1053                 $mail['owner-id']         = $mail['author-id'];
1054                 $mail['allow_cid']        = '<'.$mail['contact-id'].'>';
1055                 $mail['allow_gid']        = '';
1056                 $mail['deny_cid']         = '';
1057                 $mail['deny_gid']         = '';
1058                 $mail['private']          = Item::PRIVATE;
1059                 $mail['deleted']          = false;
1060                 $mail['edited']           = $mail['created'];
1061                 $mail['plink']            = DI::baseUrl() . '/message/' . $mail['id'];
1062                 $mail['parent-uri']       = $reply['uri'];
1063                 $mail['parent-uri-id']    = $reply['uri-id'];
1064                 $mail['parent-author-id'] = Contact::getIdForURL($reply['from-url'], 0, false);
1065                 $mail['gravity']          = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
1066                 $mail['event-type']       = '';
1067                 $mail['language']         = '';
1068                 $mail['parent']           = 0;
1069
1070                 return $mail;
1071         }
1072
1073         /**
1074          * Creates an activity array for a given mail id
1075          *
1076          * @param integer $mail_id
1077          * @param boolean $object_mode Is the activity item is used inside another object?
1078          *
1079          * @return array of activity
1080          * @throws \Exception
1081          */
1082         public static function createActivityFromMail($mail_id, $object_mode = false)
1083         {
1084                 $mail = self::ItemArrayFromMail($mail_id);
1085                 if (empty($mail)) {
1086                         return [];
1087                 }
1088                 $object = self::createNote($mail);
1089
1090                 if (!$object_mode) {
1091                         $data = ['@context' => ActivityPub::CONTEXT];
1092                 } else {
1093                         $data = [];
1094                 }
1095
1096                 $data['id'] = $mail['uri'] . '/Create';
1097                 $data['type'] = 'Create';
1098                 $data['actor'] = $mail['author-link'];
1099                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
1100                 $data['instrument'] = self::getService();
1101                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
1102
1103                 if (empty($data['to']) && !empty($data['cc'])) {
1104                         $data['to'] = $data['cc'];
1105                 }
1106
1107                 if (empty($data['to']) && !empty($data['bcc'])) {
1108                         $data['to'] = $data['bcc'];
1109                 }
1110
1111                 unset($data['cc']);
1112                 unset($data['bcc']);
1113
1114                 $object['to'] = $data['to'];
1115                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => '']];
1116
1117                 unset($object['cc']);
1118                 unset($object['bcc']);
1119
1120                 $data['directMessage'] = true;
1121
1122                 $data['object'] = $object;
1123
1124                 $owner = User::getOwnerDataById($mail['uid']);
1125
1126                 if (!$object_mode && !empty($owner)) {
1127                         return LDSignature::sign($data, $owner);
1128                 } else {
1129                         return $data;
1130                 }
1131         }
1132
1133         /**
1134          * Returns the activity type of a given item
1135          *
1136          * @param array $item
1137          *
1138          * @return string with activity type
1139          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1140          * @throws \ImagickException
1141          */
1142         private static function getTypeOfItem($item)
1143         {
1144                 $reshared = false;
1145
1146                 // Only check for a reshare, if it is a real reshare and no quoted reshare
1147                 if (strpos($item['body'], "[share") === 0) {
1148                         $announce = self::getAnnounceArray($item);
1149                         $reshared = !empty($announce);
1150                 }
1151
1152                 if ($reshared) {
1153                         $type = 'Announce';
1154                 } elseif ($item['verb'] == Activity::POST) {
1155                         if ($item['created'] == $item['edited']) {
1156                                 $type = 'Create';
1157                         } else {
1158                                 $type = 'Update';
1159                         }
1160                 } elseif ($item['verb'] == Activity::LIKE) {
1161                         $type = 'Like';
1162                 } elseif ($item['verb'] == Activity::DISLIKE) {
1163                         $type = 'Dislike';
1164                 } elseif ($item['verb'] == Activity::ATTEND) {
1165                         $type = 'Accept';
1166                 } elseif ($item['verb'] == Activity::ATTENDNO) {
1167                         $type = 'Reject';
1168                 } elseif ($item['verb'] == Activity::ATTENDMAYBE) {
1169                         $type = 'TentativeAccept';
1170                 } elseif ($item['verb'] == Activity::FOLLOW) {
1171                         $type = 'Follow';
1172                 } elseif ($item['verb'] == Activity::TAG) {
1173                         $type = 'Add';
1174                 } elseif ($item['verb'] == Activity::ANNOUNCE) {
1175                         $type = 'Announce';
1176                 } else {
1177                         $type = '';
1178                 }
1179
1180                 return $type;
1181         }
1182
1183         /**
1184          * Creates the activity or fetches it from the cache
1185          *
1186          * @param integer $item_id
1187          * @param boolean $force Force new cache entry
1188          *
1189          * @return array with the activity
1190          * @throws \Exception
1191          */
1192         public static function createCachedActivityFromItem($item_id, $force = false)
1193         {
1194                 $cachekey = 'APDelivery:createActivity:' . $item_id;
1195
1196                 if (!$force) {
1197                         $data = DI::cache()->get($cachekey);
1198                         if (!is_null($data)) {
1199                                 return $data;
1200                         }
1201                 }
1202
1203                 $data = self::createActivityFromItem($item_id);
1204
1205                 DI::cache()->set($cachekey, $data, Duration::QUARTER_HOUR);
1206                 return $data;
1207         }
1208
1209         /**
1210          * Creates an activity array for a given item id
1211          *
1212          * @param integer $item_id
1213          * @param boolean $object_mode Is the activity item is used inside another object?
1214          *
1215          * @return false|array
1216          * @throws \Exception
1217          */
1218         public static function createActivityFromItem(int $item_id, bool $object_mode = false)
1219         {
1220                 Logger::info('Fetching activity', ['item' => $item_id]);
1221                 $item = Post::selectFirst(Item::DELIVER_FIELDLIST, ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
1222                 if (!DBA::isResult($item)) {
1223                         return false;
1224                 }
1225
1226                 if (empty($item['uri-id'])) {
1227                         Logger::warning('Item without uri-id', ['item' => $item]);
1228                         return false;
1229                 }
1230
1231                 if (!$item['deleted']) {
1232                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
1233                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
1234                         if (!$item['origin'] && DBA::isResult($conversation)) {
1235                                 $data = json_decode($conversation['source'], true);
1236                                 if (!empty($data['type'])) {
1237                                         if (in_array($data['type'], ['Create', 'Update'])) {
1238                                                 if ($object_mode) {
1239                                                         unset($data['@context']);
1240                                                         unset($data['signature']);
1241                                                 }
1242                                                 Logger::info('Return stored conversation', ['item' => $item_id]);
1243                                                 return $data;
1244                                         } elseif (in_array('as:' . $data['type'], Receiver::CONTENT_TYPES)) {
1245                                                 if (!empty($data['@context'])) {
1246                                                         $context = $data['@context'];
1247                                                         unset($data['@context']);
1248                                                 }
1249                                                 unset($data['actor']);
1250                                                 $object = $data;
1251                                         }
1252                                 }
1253                         }
1254                 }
1255
1256                 $type = self::getTypeOfItem($item);
1257
1258                 if (!$object_mode) {
1259                         $data = ['@context' => $context ?? ActivityPub::CONTEXT];
1260
1261                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
1262                                 $type = 'Undo';
1263                         } elseif ($item['deleted']) {
1264                                 $type = 'Delete';
1265                         }
1266                 } else {
1267                         $data = [];
1268                 }
1269
1270                 if ($type == 'Delete') {
1271                         $data['id'] = Item::newURI($item['uid'], $item['guid']) . '/' . $type;;
1272                 } elseif (($item['gravity'] == GRAVITY_ACTIVITY) && ($type != 'Undo')) {
1273                         $data['id'] = $item['uri'];
1274                 } else {
1275                         $data['id'] = $item['uri'] . '/' . $type;
1276                 }
1277
1278                 $data['type'] = $type;
1279
1280                 if (($type != 'Announce') || ($item['gravity'] != GRAVITY_PARENT)) {
1281                         $data['actor'] = $item['author-link'];
1282                 } else {
1283                         $data['actor'] = $item['owner-link'];
1284                 }
1285
1286                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1287
1288                 $data['instrument'] = self::getService();
1289
1290                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
1291
1292                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
1293                         $data['object'] = $object ?? self::createNote($item);
1294                         $data['published'] = DateTimeFormat::utcNow(DateTimeFormat::ATOM);
1295                 } elseif ($data['type'] == 'Add') {
1296                         $data = self::createAddTag($item, $data);
1297                 } elseif ($data['type'] == 'Announce') {
1298                         if ($item['verb'] == ACTIVITY::ANNOUNCE) {
1299                                 $data['object'] = $item['thr-parent'];
1300                         } else {
1301                                 $data = self::createAnnounce($item, $data);
1302                         }
1303                 } elseif ($data['type'] == 'Follow') {
1304                         $data['object'] = $item['parent-uri'];
1305                 } elseif ($data['type'] == 'Undo') {
1306                         $data['object'] = self::createActivityFromItem($item_id, true);
1307                 } else {
1308                         $data['diaspora:guid'] = $item['guid'];
1309                         if (!empty($item['signed_text'])) {
1310                                 $data['diaspora:like'] = $item['signed_text'];
1311                         }
1312                         $data['object'] = $item['thr-parent'];
1313                 }
1314
1315                 if (!empty($item['contact-uid'])) {
1316                         $uid = $item['contact-uid'];
1317                 } else {
1318                         $uid = $item['uid'];
1319                 }
1320
1321                 $owner = User::getOwnerDataById($uid);
1322
1323                 Logger::info('Fetched activity', ['item' => $item_id, 'uid' => $uid]);
1324
1325                 // We don't sign if we aren't the actor. This is important for relaying content especially for forums
1326                 if (!$object_mode && !empty($owner) && ($data['actor'] == $owner['url'])) {
1327                         return LDSignature::sign($data, $owner);
1328                 } else {
1329                         return $data;
1330                 }
1331
1332                 /// @todo Create "conversation" entry
1333         }
1334
1335         /**
1336          * Creates a location entry for a given item array
1337          *
1338          * @param array $item
1339          *
1340          * @return array with location array
1341          */
1342         private static function createLocation($item)
1343         {
1344                 $location = ['type' => 'Place'];
1345
1346                 if (!empty($item['location'])) {
1347                         $location['name'] = $item['location'];
1348                 }
1349
1350                 $coord = [];
1351
1352                 if (empty($item['coord'])) {
1353                         $coord = Map::getCoordinates($item['location']);
1354                 } else {
1355                         $coords = explode(' ', $item['coord']);
1356                         if (count($coords) == 2) {
1357                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
1358                         }
1359                 }
1360
1361                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
1362                         $location['latitude'] = $coord['lat'];
1363                         $location['longitude'] = $coord['lon'];
1364                 }
1365
1366                 return $location;
1367         }
1368
1369         /**
1370          * Returns a tag array for a given item array
1371          *
1372          * @param array $item
1373          *
1374          * @return array of tags
1375          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1376          */
1377         private static function createTagList($item)
1378         {
1379                 $tags = [];
1380
1381                 $terms = Tag::getByURIId($item['uri-id'], [Tag::HASHTAG, Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1382                 foreach ($terms as $term) {
1383                         if ($term['type'] == Tag::HASHTAG) {
1384                                 $url = DI::baseUrl() . '/search?tag=' . urlencode($term['name']);
1385                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['name']];
1386                         } else {
1387                                 $contact = Contact::getByURL($term['url'], false, ['addr']);
1388                                 if (empty($contact)) {
1389                                         continue;
1390                                 }
1391                                 if (!empty($contact['addr'])) {
1392                                         $mention = '@' . $contact['addr'];
1393                                 } else {
1394                                         $mention = '@' . $term['url'];
1395                                 }
1396
1397                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
1398                         }
1399                 }
1400
1401                 $announce = self::getAnnounceArray($item);
1402                 // Mention the original author upon commented reshares
1403                 if (!empty($announce['comment'])) {
1404                         $tags[] = ['type' => 'Mention', 'href' => $announce['actor']['url'], 'name' => '@' . $announce['actor']['addr']];
1405                 }
1406
1407                 return $tags;
1408         }
1409
1410         /**
1411          * Adds attachment data to the JSON document
1412          *
1413          * @param array  $item Data of the item that is to be posted
1414          * @param string $type Object type
1415          *
1416          * @return array with attachment data
1417          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1418          */
1419         private static function createAttachmentList($item, $type)
1420         {
1421                 $attachments = [];
1422
1423                 $uriids = [$item['uri-id']];
1424                 $shared = BBCode::fetchShareAttributes($item['body']);
1425                 if (!empty($shared['guid'])) {
1426                         $shared_item = Post::selectFirst(['uri-id'], ['guid' => $shared['guid']]);
1427                         if (!empty($shared_item['uri-id'])) {
1428                                 $uriids[] = $shared_item['uri-id'];
1429                         }
1430                 }
1431
1432                 $urls = [];
1433                 foreach ($uriids as $uriid) {
1434                         foreach (Post\Media::getByURIId($uriid, [Post\Media::AUDIO, Post\Media::IMAGE, Post\Media::VIDEO, Post\Media::DOCUMENT, Post\Media::TORRENT]) as $attachment) {
1435                                 if (in_array($attachment['url'], $urls)) {
1436                                         continue;
1437                                 }
1438                                 $urls[] = $attachment['url'];
1439
1440                                 $attach = ['type' => 'Document',
1441                                         'mediaType' => $attachment['mimetype'],
1442                                         'url' => $attachment['url'],
1443                                         'name' => $attachment['description']];
1444
1445                                 if (!empty($attachment['height'])) {
1446                                         $attach['height'] = $attachment['height'];
1447                                 }
1448
1449                                 if (!empty($attachment['width'])) {
1450                                         $attach['width'] = $attachment['width'];
1451                                 }
1452
1453                                 if (!empty($attachment['preview'])) {
1454                                         $attach['image'] = $attachment['preview'];
1455                                 }
1456
1457                                 $attachments[] = $attach;
1458                         }
1459                 }
1460
1461                 return $attachments;
1462         }
1463
1464         /**
1465          * Callback function to replace a Friendica style mention in a mention for a summary
1466          *
1467          * @param array $match Matching values for the callback
1468          * @return string Replaced mention
1469          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1470          */
1471         private static function mentionAddrCallback($match)
1472         {
1473                 if (empty($match[1])) {
1474                         return '';
1475                 }
1476
1477                 $data = Contact::getByURL($match[1], false, ['addr']);
1478                 if (empty($data['addr'])) {
1479                         return $match[0];
1480                 }
1481
1482                 return '@' . $data['addr'];
1483         }
1484
1485         /**
1486          * Remove image elements since they are added as attachment
1487          *
1488          * @param string $body
1489          *
1490          * @return string with removed images
1491          */
1492         private static function removePictures($body)
1493         {
1494                 // Simplify image codes
1495                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1496                 $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
1497
1498                 // Now remove local links
1499                 $body = preg_replace_callback(
1500                         '/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi',
1501                         function ($match) {
1502                                 // We remove the link when it is a link to a local photo page
1503                                 if (Photo::isLocalPage($match[1])) {
1504                                         return '';
1505                                 }
1506                                 // otherwise we just return the link
1507                                 return '[url]' . $match[1] . '[/url]';
1508                         },
1509                         $body
1510                 );
1511
1512                 // Remove all pictures
1513                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '', $body);
1514
1515                 return $body;
1516         }
1517
1518         /**
1519          * Fetches the "context" value for a givem item array from the "conversation" table
1520          *
1521          * @param array $item
1522          *
1523          * @return string with context url
1524          * @throws \Exception
1525          */
1526         private static function fetchContextURLForItem($item)
1527         {
1528                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1529                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1530                         $context_uri = $conversation['conversation-href'];
1531                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1532                         $context_uri = $conversation['conversation-uri'];
1533                 } else {
1534                         $context_uri = $item['parent-uri'] . '#context';
1535                 }
1536                 return $context_uri;
1537         }
1538
1539         /**
1540          * Returns if the post contains sensitive content ("nsfw")
1541          *
1542          * @param integer $uri_id
1543          *
1544          * @return boolean
1545          * @throws \Exception
1546          */
1547         private static function isSensitive($uri_id)
1548         {
1549                 return DBA::exists('tag-view', ['uri-id' => $uri_id, 'name' => 'nsfw', 'type' => Tag::HASHTAG]);
1550         }
1551
1552         /**
1553          * Creates event data
1554          *
1555          * @param array $item
1556          *
1557          * @return array with the event data
1558          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1559          */
1560         private static function createEvent($item)
1561         {
1562                 $event = [];
1563                 $event['name'] = $item['event-summary'];
1564                 $event['content'] = BBCode::convertForUriId($item['uri-id'], $item['event-desc'], BBCode::ACTIVITYPUB);
1565                 $event['startTime'] = DateTimeFormat::utc($item['event-start'], 'c');
1566
1567                 if (!$item['event-nofinish']) {
1568                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'], 'c');
1569                 }
1570
1571                 if (!empty($item['event-location'])) {
1572                         $item['location'] = $item['event-location'];
1573                         $event['location'] = self::createLocation($item);
1574                 }
1575
1576                 // 2021.12: Backward compatibility value, all the events now "adjust" to the viewer timezone
1577                 $event['dfrn:adjust'] = true;
1578
1579                 return $event;
1580         }
1581
1582         /**
1583          * Creates a note/article object array
1584          *
1585          * @param array $item
1586          *
1587          * @return array with the object data
1588          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1589          * @throws \ImagickException
1590          */
1591         public static function createNote($item)
1592         {
1593                 if (empty($item)) {
1594                         return [];
1595                 }
1596
1597                 // We are treating posts differently when they are directed to a community.
1598                 // This is done to better support Lemmy. Most of the changes should work with other systems as well.
1599                 // But to not risk compatibility issues we currently perform the changes only for communities.
1600                 if ($item['gravity'] == GRAVITY_PARENT) {
1601                         $isCommunityPost = !empty(Tag::getByURIId($item['uri-id'], [Tag::EXCLUSIVE_MENTION]));
1602                         $links = Post\Media::getByURIId($item['uri-id'], [Post\Media::HTML]);
1603                         if ($isCommunityPost && (count($links) == 1)) {
1604                                 $link = $links[0]['url'];
1605                         }
1606                 } else {
1607                         $isCommunityPost = false;
1608                 }
1609
1610                 if ($item['event-type'] == 'event') {
1611                         $type = 'Event';
1612                 } elseif (!empty($item['title'])) {
1613                         if (!$isCommunityPost || empty($link)) {
1614                                 $type = 'Article';
1615                         } else {
1616                                 // "Page" is used by Lemmy for posts that contain an external link
1617                                 $type = 'Page';
1618                         }
1619                 } else {
1620                         $type = 'Note';
1621                 }
1622
1623                 if ($item['deleted']) {
1624                         $type = 'Tombstone';
1625                 }
1626
1627                 $data = [];
1628                 $data['id'] = $item['uri'];
1629                 $data['type'] = $type;
1630
1631                 if ($item['deleted']) {
1632                         return $data;
1633                 }
1634
1635                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1636
1637                 if ($item['uri'] != $item['thr-parent']) {
1638                         $data['inReplyTo'] = $item['thr-parent'];
1639                 } else {
1640                         $data['inReplyTo'] = null;
1641                 }
1642
1643                 $data['diaspora:guid'] = $item['guid'];
1644                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1645
1646                 if ($item['created'] != $item['edited']) {
1647                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1648                 }
1649
1650                 $data['url'] = $link ?? $item['plink'];
1651                 $data['attributedTo'] = $item['author-link'];
1652                 $data['sensitive'] = self::isSensitive($item['uri-id']);
1653                 $data['context'] = self::fetchContextURLForItem($item);
1654
1655                 if (!empty($item['title'])) {
1656                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1657                 }
1658
1659                 $permission_block = self::createPermissionBlockForItem($item, false);
1660
1661                 $body = $item['body'];
1662
1663                 if ($type == 'Note') {
1664                         $body = $item['raw-body'] ?? self::removePictures($body);
1665                 }
1666
1667                 /**
1668                  * @todo Improve the automated summary
1669                  * This part is currently deactivated. The automated summary seems to be more
1670                  * confusing than helping. But possibly we will find a better way.
1671                  * So the code is left here for now as a reminder
1672                  *
1673                  * } elseif (($type == 'Article') && empty($data['summary'])) {
1674                  *              $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1675                  *              $summary = preg_replace_callback($regexp, ['self', 'mentionAddrCallback'], $body);
1676                  *              $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($summary), 1000));
1677                  * }
1678                  */
1679
1680                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1681                         $body = self::prependMentions($body, $item['uri-id'], $item['author-link']);
1682                 }
1683
1684                 if ($type == 'Event') {
1685                         $data = array_merge($data, self::createEvent($item));
1686                 } else {
1687                         if ($isCommunityPost) {
1688                                 // For community posts we remove the visible "!user@domain.tld".
1689                                 // This improves the look at systems like Lemmy.
1690                                 // Also in the future we should control the community delivery via other methods.
1691                                 $body = preg_replace("/!\[url\=[^\[\]]*\][^\[\]]*\[\/url\]/ism", '', $body);
1692                         }
1693
1694                         if ($type == 'Page') {
1695                                 // When we transmit "Page" posts we have to remove the attachment.
1696                                 // The attachment contains the link that we already transmit in the "url" field.
1697                                 $body = preg_replace("/\s*\[attachment .*?\].*?\[\/attachment\]\s*/ism", '', $body);
1698                         }
1699
1700                         $body = BBCode::setMentionsToNicknames($body);
1701
1702                         $data['content'] = BBCode::convertForUriId($item['uri-id'], $body, BBCode::ACTIVITYPUB);
1703                 }
1704
1705                 // The regular "content" field does contain a minimized HTML. This is done since systems like
1706                 // Mastodon has got problems with - for example - embedded pictures.
1707                 // The contentMap does contain the unmodified HTML.
1708                 $language = self::getLanguage($item);
1709                 if (!empty($language)) {
1710                         $richbody = BBCode::setMentionsToNicknames($item['body'] ?? '');
1711                         $richbody = BBCode::removeAttachment($richbody);
1712
1713                         $data['contentMap'][$language] = BBCode::convertForUriId($item['uri-id'], $richbody, BBCode::EXTERNAL);
1714                 }
1715
1716                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1717
1718                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1719                         $data['diaspora:comment'] = $item['signed_text'];
1720                 }
1721
1722                 $data['attachment'] = self::createAttachmentList($item, $type);
1723                 $data['tag'] = self::createTagList($item);
1724
1725                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1726                         $data['location'] = self::createLocation($item);
1727                 }
1728
1729                 if (!empty($item['app'])) {
1730                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1731                 }
1732
1733                 $data = array_merge($data, $permission_block);
1734
1735                 return $data;
1736         }
1737
1738         /**
1739          * Fetches the language from the post, the user or the system.
1740          *
1741          * @param array $item
1742          *
1743          * @return string language string
1744          */
1745         private static function getLanguage(array $item)
1746         {
1747                 // Try to fetch the language from the post itself
1748                 if (!empty($item['language'])) {
1749                         $languages = array_keys(json_decode($item['language'], true));
1750                         if (!empty($languages[0])) {
1751                                 return $languages[0];
1752                         }
1753                 }
1754
1755                 // Otherwise use the user's language
1756                 if (!empty($item['uid'])) {
1757                         $user = DBA::selectFirst('user', ['language'], ['uid' => $item['uid']]);
1758                         if (!empty($user['language'])) {
1759                                 return $user['language'];
1760                         }
1761                 }
1762
1763                 // And finally just use the system language
1764                 return DI::config()->get('system', 'language');
1765         }
1766
1767         /**
1768          * Creates an an "add tag" entry
1769          *
1770          * @param array $item
1771          * @param array $data activity data
1772          *
1773          * @return array with activity data for adding tags
1774          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1775          * @throws \ImagickException
1776          */
1777         private static function createAddTag($item, $data)
1778         {
1779                 $object = XML::parseString($item['object']);
1780                 $target = XML::parseString($item["target"]);
1781
1782                 $data['diaspora:guid'] = $item['guid'];
1783                 $data['actor'] = $item['author-link'];
1784                 $data['target'] = (string)$target->id;
1785                 $data['summary'] = BBCode::toPlaintext($item['body']);
1786                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1787
1788                 return $data;
1789         }
1790
1791         /**
1792          * Creates an announce object entry
1793          *
1794          * @param array $item
1795          * @param array $data activity data
1796          *
1797          * @return array with activity data
1798          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1799          * @throws \ImagickException
1800          */
1801         private static function createAnnounce($item, $data)
1802         {
1803                 $orig_body = $item['body'];
1804                 $announce = self::getAnnounceArray($item);
1805                 if (empty($announce)) {
1806                         $data['type'] = 'Create';
1807                         $data['object'] = self::createNote($item);
1808                         return $data;
1809                 }
1810
1811                 if (empty($announce['comment'])) {
1812                         // Pure announce, without a quote
1813                         $data['type'] = 'Announce';
1814                         $data['object'] = $announce['object']['uri'];
1815                         return $data;
1816                 }
1817
1818                 // Quote
1819                 $data['type'] = 'Create';
1820                 $item['body'] = $announce['comment'] . "\n" . $announce['object']['plink'];
1821                 $data['object'] = self::createNote($item);
1822
1823                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1824                 $data['object']['attachment'][] = self::createNote($announce['object']);
1825
1826                 $data['object']['source']['content'] = $orig_body;
1827                 return $data;
1828         }
1829
1830         /**
1831          * Return announce related data if the item is an annunce
1832          *
1833          * @param array $item
1834          *
1835          * @return array
1836          */
1837         public static function getAnnounceArray($item)
1838         {
1839                 $reshared = Item::getShareArray($item);
1840                 if (empty($reshared['guid'])) {
1841                         return [];
1842                 }
1843
1844                 $reshared_item = Post::selectFirst(Item::DELIVER_FIELDLIST, ['guid' => $reshared['guid']]);
1845                 if (!DBA::isResult($reshared_item)) {
1846                         return [];
1847                 }
1848
1849                 if (!in_array($reshared_item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1850                         return [];
1851                 }
1852
1853                 $profile = APContact::getByURL($reshared_item['author-link'], false);
1854                 if (empty($profile)) {
1855                         return [];
1856                 }
1857
1858                 return ['object' => $reshared_item, 'actor' => $profile, 'comment' => $reshared['comment']];
1859         }
1860
1861         /**
1862          * Checks if the provided item array is an announce
1863          *
1864          * @param array $item
1865          *
1866          * @return boolean
1867          */
1868         public static function isAnnounce($item)
1869         {
1870                 if (!empty($item['verb']) && ($item['verb'] == Activity::ANNOUNCE)) {
1871                         return true;
1872                 }
1873
1874                 $announce = self::getAnnounceArray($item);
1875                 if (empty($announce)) {
1876                         return false;
1877                 }
1878
1879                 return empty($announce['comment']);
1880         }
1881
1882         /**
1883          * Creates an activity id for a given contact id
1884          *
1885          * @param integer $cid Contact ID of target
1886          *
1887          * @return bool|string activity id
1888          */
1889         public static function activityIDFromContact($cid)
1890         {
1891                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1892                 if (!DBA::isResult($contact)) {
1893                         return false;
1894                 }
1895
1896                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1897                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1898                 return DI::baseUrl() . '/activity/' . $uuid;
1899         }
1900
1901         /**
1902          * Transmits a contact suggestion to a given inbox
1903          *
1904          * @param integer $uid           User ID
1905          * @param string  $inbox         Target inbox
1906          * @param integer $suggestion_id Suggestion ID
1907          *
1908          * @return boolean was the transmission successful?
1909          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1910          */
1911         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1912         {
1913                 $owner = User::getOwnerDataById($uid);
1914
1915                 $suggestion = DI::fsuggest()->selectOneById($suggestion_id);
1916
1917                 $data = ['@context' => ActivityPub::CONTEXT,
1918                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1919                         'type' => 'Announce',
1920                         'actor' => $owner['url'],
1921                         'object' => $suggestion->url,
1922                         'content' => $suggestion->note,
1923                         'instrument' => self::getService(),
1924                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1925                         'cc' => []];
1926
1927                 $signed = LDSignature::sign($data, $owner);
1928
1929                 Logger::info('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub');
1930                 return HTTPSignature::transmit($signed, $inbox, $uid);
1931         }
1932
1933         /**
1934          * Transmits a profile relocation to a given inbox
1935          *
1936          * @param integer $uid   User ID
1937          * @param string  $inbox Target inbox
1938          *
1939          * @return boolean was the transmission successful?
1940          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1941          */
1942         public static function sendProfileRelocation($uid, $inbox)
1943         {
1944                 $owner = User::getOwnerDataById($uid);
1945
1946                 $data = ['@context' => ActivityPub::CONTEXT,
1947                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1948                         'type' => 'dfrn:relocate',
1949                         'actor' => $owner['url'],
1950                         'object' => $owner['url'],
1951                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1952                         'instrument' => self::getService(),
1953                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1954                         'cc' => []];
1955
1956                 $signed = LDSignature::sign($data, $owner);
1957
1958                 Logger::info('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub');
1959                 return HTTPSignature::transmit($signed, $inbox, $uid);
1960         }
1961
1962         /**
1963          * Transmits a profile deletion to a given inbox
1964          *
1965          * @param integer $uid   User ID
1966          * @param string  $inbox Target inbox
1967          *
1968          * @return boolean was the transmission successful?
1969          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1970          */
1971         public static function sendProfileDeletion($uid, $inbox)
1972         {
1973                 $owner = User::getOwnerDataById($uid);
1974
1975                 if (empty($owner)) {
1976                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1977                         return false;
1978                 }
1979
1980                 if (empty($owner['uprvkey'])) {
1981                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1982                         return false;
1983                 }
1984
1985                 $data = ['@context' => ActivityPub::CONTEXT,
1986                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1987                         'type' => 'Delete',
1988                         'actor' => $owner['url'],
1989                         'object' => $owner['url'],
1990                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1991                         'instrument' => self::getService(),
1992                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1993                         'cc' => []];
1994
1995                 $signed = LDSignature::sign($data, $owner);
1996
1997                 Logger::info('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub');
1998                 return HTTPSignature::transmit($signed, $inbox, $uid);
1999         }
2000
2001         /**
2002          * Transmits a profile change to a given inbox
2003          *
2004          * @param integer $uid   User ID
2005          * @param string  $inbox Target inbox
2006          *
2007          * @return boolean was the transmission successful?
2008          * @throws HTTPException\InternalServerErrorException
2009          * @throws HTTPException\NotFoundException
2010          * @throws \ImagickException
2011          */
2012         public static function sendProfileUpdate(int $uid, string $inbox): bool
2013         {
2014                 $owner = User::getOwnerDataById($uid);
2015                 $profile = APContact::getByURL($owner['url']);
2016
2017                 $data = ['@context' => ActivityPub::CONTEXT,
2018                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
2019                         'type' => 'Update',
2020                         'actor' => $owner['url'],
2021                         'object' => self::getProfile($uid),
2022                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
2023                         'instrument' => self::getService(),
2024                         'to' => [$profile['followers']],
2025                         'cc' => []];
2026
2027                 $signed = LDSignature::sign($data, $owner);
2028
2029                 Logger::info('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub');
2030                 return HTTPSignature::transmit($signed, $inbox, $uid);
2031         }
2032
2033         /**
2034          * Transmits a given activity to a target
2035          *
2036          * @param string  $activity Type name
2037          * @param string  $target   Target profile
2038          * @param integer $uid      User ID
2039          * @return bool
2040          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2041          * @throws \ImagickException
2042          * @throws \Exception
2043          */
2044         public static function sendActivity($activity, $target, $uid, $id = '')
2045         {
2046                 $profile = APContact::getByURL($target);
2047                 if (empty($profile['inbox'])) {
2048                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
2049                         return;
2050                 }
2051
2052                 $owner = User::getOwnerDataById($uid);
2053
2054                 if (empty($id)) {
2055                         $id = DI::baseUrl() . '/activity/' . System::createGUID();
2056                 }
2057
2058                 $data = ['@context' => ActivityPub::CONTEXT,
2059                         'id' => $id,
2060                         'type' => $activity,
2061                         'actor' => $owner['url'],
2062                         'object' => $profile['url'],
2063                         'instrument' => self::getService(),
2064                         'to' => [$profile['url']]];
2065
2066                 Logger::info('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid);
2067
2068                 $signed = LDSignature::sign($data, $owner);
2069                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2070         }
2071
2072         /**
2073          * Transmits a "follow object" activity to a target
2074          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
2075          *
2076          * @param string  $object Object URL
2077          * @param string  $target Target profile
2078          * @param integer $uid    User ID
2079          * @return bool
2080          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2081          * @throws \ImagickException
2082          * @throws \Exception
2083          */
2084         public static function sendFollowObject($object, $target, $uid = 0)
2085         {
2086                 $profile = APContact::getByURL($target);
2087                 if (empty($profile['inbox'])) {
2088                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
2089                         return;
2090                 }
2091
2092                 if (empty($uid)) {
2093                         // Fetch the list of administrators
2094                         $admin_mail = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
2095
2096                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
2097                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
2098                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
2099                         $uid = $first_user['uid'];
2100                 }
2101
2102                 $condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,
2103                         'author-id' => Contact::getPublicIdByUserId($uid)];
2104                 if (Post::exists($condition)) {
2105                         Logger::info('Follow for ' . $object . ' for user ' . $uid . ' does already exist.');
2106                         return false;
2107                 }
2108
2109                 $owner = User::getOwnerDataById($uid);
2110
2111                 $data = ['@context' => ActivityPub::CONTEXT,
2112                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
2113                         'type' => 'Follow',
2114                         'actor' => $owner['url'],
2115                         'object' => $object,
2116                         'instrument' => self::getService(),
2117                         'to' => [$profile['url']]];
2118
2119                 Logger::info('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid);
2120
2121                 $signed = LDSignature::sign($data, $owner);
2122                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2123         }
2124
2125         /**
2126          * Transmit a message that the contact request had been accepted
2127          *
2128          * @param string  $target Target profile
2129          * @param         $id
2130          * @param integer $uid    User ID
2131          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2132          * @throws \ImagickException
2133          */
2134         public static function sendContactAccept($target, $id, $uid)
2135         {
2136                 $profile = APContact::getByURL($target);
2137                 if (empty($profile['inbox'])) {
2138                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
2139                         return;
2140                 }
2141
2142                 $owner = User::getOwnerDataById($uid);
2143                 $data = ['@context' => ActivityPub::CONTEXT,
2144                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
2145                         'type' => 'Accept',
2146                         'actor' => $owner['url'],
2147                         'object' => [
2148                                 'id' => (string)$id,
2149                                 'type' => 'Follow',
2150                                 'actor' => $profile['url'],
2151                                 'object' => $owner['url']
2152                         ],
2153                         'instrument' => self::getService(),
2154                         'to' => [$profile['url']]];
2155
2156                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
2157
2158                 $signed = LDSignature::sign($data, $owner);
2159                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2160         }
2161
2162         /**
2163          * Reject a contact request or terminates the contact relation
2164          *
2165          * @param string  $target Target profile
2166          * @param         $id
2167          * @param integer $uid    User ID
2168          * @return bool Operation success
2169          * @throws HTTPException\InternalServerErrorException
2170          * @throws \ImagickException
2171          */
2172         public static function sendContactReject($target, $id, $uid): bool
2173         {
2174                 $profile = APContact::getByURL($target);
2175                 if (empty($profile['inbox'])) {
2176                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
2177                         return false;
2178                 }
2179
2180                 $owner = User::getOwnerDataById($uid);
2181                 $data = ['@context' => ActivityPub::CONTEXT,
2182                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
2183                         'type' => 'Reject',
2184                         'actor' => $owner['url'],
2185                         'object' => [
2186                                 'id' => (string)$id,
2187                                 'type' => 'Follow',
2188                                 'actor' => $profile['url'],
2189                                 'object' => $owner['url']
2190                         ],
2191                         'instrument' => self::getService(),
2192                         'to' => [$profile['url']]];
2193
2194                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
2195
2196                 $signed = LDSignature::sign($data, $owner);
2197                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2198         }
2199
2200         /**
2201          * Transmits a message that we don't want to follow this contact anymore
2202          *
2203          * @param string  $target Target profile
2204          * @param integer $uid    User ID
2205          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2206          * @throws \ImagickException
2207          * @throws \Exception
2208          * @return bool success
2209          */
2210         public static function sendContactUndo($target, $cid, $uid)
2211         {
2212                 $profile = APContact::getByURL($target);
2213                 if (empty($profile['inbox'])) {
2214                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
2215                         return false;
2216                 }
2217
2218                 $object_id = self::activityIDFromContact($cid);
2219                 if (empty($object_id)) {
2220                         return false;
2221                 }
2222
2223                 $id = DI::baseUrl() . '/activity/' . System::createGUID();
2224
2225                 $owner = User::getOwnerDataById($uid);
2226                 $data = ['@context' => ActivityPub::CONTEXT,
2227                         'id' => $id,
2228                         'type' => 'Undo',
2229                         'actor' => $owner['url'],
2230                         'object' => ['id' => $object_id, 'type' => 'Follow',
2231                                 'actor' => $owner['url'],
2232                                 'object' => $profile['url']],
2233                         'instrument' => self::getService(),
2234                         'to' => [$profile['url']]];
2235
2236                 Logger::info('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id);
2237
2238                 $signed = LDSignature::sign($data, $owner);
2239                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2240         }
2241
2242         private static function prependMentions($body, int $uriid, string $authorLink)
2243         {
2244                 $mentions = [];
2245
2246                 foreach (Tag::getByURIId($uriid, [Tag::IMPLICIT_MENTION]) as $tag) {
2247                         $profile = Contact::getByURL($tag['url'], false, ['addr', 'contact-type', 'nick']);
2248                         if (!empty($profile['addr'])
2249                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
2250                                 && !strstr($body, $profile['addr'])
2251                                 && !strstr($body, $tag['url'])
2252                                 && $tag['url'] !== $authorLink
2253                         ) {
2254                                 $mentions[] = '@[url=' . $tag['url'] . ']' . $profile['nick'] . '[/url]';
2255                         }
2256                 }
2257
2258                 $mentions[] = $body;
2259
2260                 return implode(' ', $mentions);
2261         }
2262 }