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