src/Protocol/ActivityPub/Transmitter.php

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