src/Protocol/ActivityPub/Transmitter.php

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