src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\Plaintext;
  27 use Friendica\Core\Cache\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\APContact;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\Item;
  37 use Friendica\Model\Profile;
  38 use Friendica\Model\Photo;
  39 use Friendica\Model\Term;
  40 use Friendica\Model\User;
  41 use Friendica\Protocol\Activity;
  42 use Friendica\Protocol\ActivityPub;
  43 use Friendica\Util\DateTimeFormat;
  44 use Friendica\Util\HTTPSignature;
  45 use Friendica\Util\Images;
  46 use Friendica\Util\JsonLD;
  47 use Friendica\Util\LDSignature;
  48 use Friendica\Util\Map;
  49 use Friendica\Util\Network;
  50 use Friendica\Util\XML;
  51
  52 require_once 'include/api.php';
  53 require_once 'mod/share.php';
  54
  55 /**
  56  * ActivityPub Transmitter Protocol class
  57  *
  58  * To-Do:
  59  * @todo Undo Announce
  60  */
  61 class Transmitter
  62 {
  63         /**
  64          * collects the lost of followers of the given owner
  65          *
  66          * @param array   $owner Owner array
  67          * @param integer $page  Page number
  68          *
  69          * @return array of owners
  70          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  71          */
  72         public static function getFollowers($owner, $page = null)
  73         {
  74                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  75                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  76                 $count = DBA::count('contact', $condition);
  77
  78                 $data = ['@context' => ActivityPub::CONTEXT];
  79                 $data['id'] = DI::baseUrl() . '/followers/' . $owner['nickname'];
  80                 $data['type'] = 'OrderedCollection';
  81                 $data['totalItems'] = $count;
  82
  83                 // When we hide our friends we will only show the pure number but don't allow more.
  84                 $profile = Profile::getByUID($owner['uid']);
  85                 if (!empty($profile['hide-friends'])) {
  86                         return $data;
  87                 }
  88
  89                 if (empty($page)) {
  90                         $data['first'] = DI::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  91                 } else {
  92                         $data['type'] = 'OrderedCollectionPage';
  93                         $list = [];
  94
  95                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  96                         while ($contact = DBA::fetch($contacts)) {
  97                                 $list[] = $contact['url'];
  98                         }
  99
 100                         if (!empty($list)) {
 101                                 $data['next'] = DI::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
 102                         }
 103
 104                         $data['partOf'] = DI::baseUrl() . '/followers/' . $owner['nickname'];
 105
 106                         $data['orderedItems'] = $list;
 107                 }
 108
 109                 return $data;
 110         }
 111
 112         /**
 113          * Create list of following contacts
 114          *
 115          * @param array   $owner Owner array
 116          * @param integer $page  Page numbe
 117          *
 118          * @return array of following contacts
 119          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 120          */
 121         public static function getFollowing($owner, $page = null)
 122         {
 123                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 124                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 125                 $count = DBA::count('contact', $condition);
 126
 127                 $data = ['@context' => ActivityPub::CONTEXT];
 128                 $data['id'] = DI::baseUrl() . '/following/' . $owner['nickname'];
 129                 $data['type'] = 'OrderedCollection';
 130                 $data['totalItems'] = $count;
 131
 132                 // When we hide our friends we will only show the pure number but don't allow more.
 133                 $profile = Profile::getByUID($owner['uid']);
 134                 if (!empty($profile['hide-friends'])) {
 135                         return $data;
 136                 }
 137
 138                 if (empty($page)) {
 139                         $data['first'] = DI::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 140                 } else {
 141                         $data['type'] = 'OrderedCollectionPage';
 142                         $list = [];
 143
 144                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 145                         while ($contact = DBA::fetch($contacts)) {
 146                                 $list[] = $contact['url'];
 147                         }
 148
 149                         if (!empty($list)) {
 150                                 $data['next'] = DI::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 151                         }
 152
 153                         $data['partOf'] = DI::baseUrl() . '/following/' . $owner['nickname'];
 154
 155                         $data['orderedItems'] = $list;
 156                 }
 157
 158                 return $data;
 159         }
 160
 161         /**
 162          * Public posts for the given owner
 163          *
 164          * @param array   $owner Owner array
 165          * @param integer $page  Page numbe
 166          *
 167          * @return array of posts
 168          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 169          * @throws \ImagickException
 170          */
 171         public static function getOutbox($owner, $page = null)
 172         {
 173                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 174
 175                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 176                         'private' => [Item::PUBLIC, Item::UNLISTED], 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 177                         'deleted' => false, 'visible' => true, 'moderated' => false];
 178                 $count = DBA::count('item', $condition);
 179
 180                 $data = ['@context' => ActivityPub::CONTEXT];
 181                 $data['id'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 182                 $data['type'] = 'OrderedCollection';
 183                 $data['totalItems'] = $count;
 184
 185                 if (empty($page)) {
 186                         $data['first'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 187                 } else {
 188                         $data['type'] = 'OrderedCollectionPage';
 189                         $list = [];
 190
 191                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 192
 193                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 194                         while ($item = Item::fetch($items)) {
 195                                 $activity = self::createActivityFromItem($item['id'], true);
 196                                 // Only list "Create" activity objects here, no reshares
 197                                 if (is_array($activity['object']) && ($activity['type'] == 'Create')) {
 198                                         $list[] = $activity['object'];
 199                                 }
 200                         }
 201
 202                         if (!empty($list)) {
 203                                 $data['next'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 204                         }
 205
 206                         $data['partOf'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 207
 208                         $data['orderedItems'] = $list;
 209                 }
 210
 211                 return $data;
 212         }
 213
 214         /**
 215          * Return the service array containing information the used software and it's url
 216          *
 217          * @return array with service data
 218          */
 219         private static function getService()
 220         {
 221                 return ['type' => 'Service',
 222                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 223                         'url' => DI::baseUrl()->get()];
 224         }
 225
 226         /**
 227          * Return the ActivityPub profile of the given user
 228          *
 229          * @param integer $uid User ID
 230          * @return array with profile data
 231          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 232          */
 233         public static function getProfile($uid)
 234         {
 235                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 236                         'account_removed' => false, 'verified' => true];
 237                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 238                 $user = DBA::selectFirst('user', $fields, $condition);
 239                 if (!DBA::isResult($user)) {
 240                         return [];
 241                 }
 242
 243                 $fields = ['locality', 'region', 'country-name'];
 244                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid]);
 245                 if (!DBA::isResult($profile)) {
 246                         return [];
 247                 }
 248
 249                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 250                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 251                 if (!DBA::isResult($contact)) {
 252                         return [];
 253                 }
 254
 255                 $data = ['@context' => ActivityPub::CONTEXT];
 256                 $data['id'] = $contact['url'];
 257                 $data['diaspora:guid'] = $user['guid'];
 258                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 259                 $data['following'] = DI::baseUrl() . '/following/' . $user['nickname'];
 260                 $data['followers'] = DI::baseUrl() . '/followers/' . $user['nickname'];
 261                 $data['inbox'] = DI::baseUrl() . '/inbox/' . $user['nickname'];
 262                 $data['outbox'] = DI::baseUrl() . '/outbox/' . $user['nickname'];
 263                 $data['preferredUsername'] = $user['nickname'];
 264                 $data['name'] = $contact['name'];
 265                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 266                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 267                 $data['summary'] = BBCode::convert($contact['about'], false);
 268                 $data['url'] = $contact['url'];
 269                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 270                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 271                         'owner' => $contact['url'],
 272                         'publicKeyPem' => $user['pubkey']];
 273                 $data['endpoints'] = ['sharedInbox' => DI::baseUrl() . '/inbox'];
 274                 $data['icon'] = ['type' => 'Image',
 275                         'url' => $contact['photo']];
 276
 277                 $data['generator'] = self::getService();
 278
 279                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 280                 return $data;
 281         }
 282
 283         /**
 284          * @param string $username
 285          * @return array
 286          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 287          */
 288         public static function getDeletedUser($username)
 289         {
 290                 return [
 291                         '@context' => ActivityPub::CONTEXT,
 292                         'id' => DI::baseUrl() . '/profile/' . $username,
 293                         'type' => 'Tombstone',
 294                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 295                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 296                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 297                 ];
 298         }
 299
 300         /**
 301          * Returns an array with permissions of a given item array
 302          *
 303          * @param array $item
 304          *
 305          * @return array with permissions
 306          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 307          * @throws \ImagickException
 308          */
 309         private static function fetchPermissionBlockFromConversation($item)
 310         {
 311                 if (empty($item['thr-parent'])) {
 312                         return [];
 313                 }
 314
 315                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 316                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 317                 if (!DBA::isResult($conversation)) {
 318                         return [];
 319                 }
 320
 321                 $activity = json_decode($conversation['source'], true);
 322
 323                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 324                 $profile = APContact::getByURL($actor);
 325
 326                 $item_profile = APContact::getByURL($item['author-link']);
 327                 $exclude[] = $item['author-link'];
 328
 329                 if ($item['gravity'] == GRAVITY_PARENT) {
 330                         $exclude[] = $item['owner-link'];
 331                 }
 332
 333                 $permissions['to'][] = $actor;
 334
 335                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 336                         if (empty($activity[$element])) {
 337                                 continue;
 338                         }
 339                         if (is_string($activity[$element])) {
 340                                 $activity[$element] = [$activity[$element]];
 341                         }
 342
 343                         foreach ($activity[$element] as $receiver) {
 344                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 345                                         $permissions[$element][] = $item_profile['followers'];
 346                                 } elseif (!in_array($receiver, $exclude)) {
 347                                         $permissions[$element][] = $receiver;
 348                                 }
 349                         }
 350                 }
 351                 return $permissions;
 352         }
 353
 354         /**
 355          * Creates an array of permissions from an item thread
 356          *
 357          * @param array   $item       Item array
 358          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 359          * @param integer $last_id    Last item id for adding receivers
 360          * @param boolean $forum_mode "true" means that we are sending content to a forum
 361          *
 362          * @return array with permission data
 363          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 364          * @throws \ImagickException
 365          */
 366         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 367         {
 368                 if ($last_id == 0) {
 369                         $last_id = $item['id'];
 370                 }
 371
 372                 $always_bcc = false;
 373
 374                 // Check if we should always deliver our stuff via BCC
 375                 if (!empty($item['uid'])) {
 376                         $profile = Profile::getByUID($item['uid']);
 377                         if (!empty($profile)) {
 378                                 $always_bcc = $profile['hide-friends'];
 379                         }
 380                 }
 381
 382                 if (DI::config()->get('system', 'ap_always_bcc')) {
 383                         $always_bcc = true;
 384                 }
 385
 386                 if (self::isAnnounce($item) || DI::config()->get('debug', 'total_ap_delivery')) {
 387                         // Will be activated in a later step
 388                         $networks = Protocol::FEDERATED;
 389                 } else {
 390                         // For now only send to these contacts:
 391                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 392                 }
 393
 394                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 395
 396                 if ($item['gravity'] == GRAVITY_PARENT) {
 397                         $actor_profile = APContact::getByURL($item['owner-link']);
 398                 } else {
 399                         $actor_profile = APContact::getByURL($item['author-link']);
 400                 }
 401
 402                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 403
 404                 if ($item['private'] != Item::PRIVATE) {
 405                         // Directly mention the original author upon a quoted reshare.
 406                         // Else just ensure that the original author receives the reshare.
 407                         $announce = self::getAnnounceArray($item);
 408                         if (!empty($announce['comment'])) {
 409                                 $data['to'][] = $announce['actor']['url'];
 410                         } elseif (!empty($announce)) {
 411                                 $data['cc'][] = $announce['actor']['url'];
 412                         }
 413
 414                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 415
 416                         // Check if the item is completely public or unlisted
 417                         if ($item['private'] == Item::PUBLIC) {
 418                                 $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 419                         } else {
 420                                 $data['cc'][] = ActivityPub::PUBLIC_COLLECTION;
 421                         }
 422
 423                         foreach ($terms as $term) {
 424                                 $profile = APContact::getByURL($term['url'], false);
 425                                 if (!empty($profile)) {
 426                                         $data['to'][] = $profile['url'];
 427                                 }
 428                         }
 429                 } else {
 430                         $receiver_list = Item::enumeratePermissions($item, true);
 431
 432                         foreach ($terms as $term) {
 433                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 434                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 435                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 436                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 437                                                 continue;
 438                                         }
 439
 440                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 441                                                 $data['to'][] = $profile['url'];
 442                                         }
 443                                 }
 444                         }
 445
 446                         foreach ($receiver_list as $receiver) {
 447                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 448                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 449                                         continue;
 450                                 }
 451
 452                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 453                                         if ($contact['hidden'] || $always_bcc) {
 454                                                 $data['bcc'][] = $profile['url'];
 455                                         } else {
 456                                                 $data['cc'][] = $profile['url'];
 457                                         }
 458                                 }
 459                         }
 460                 }
 461
 462                 if (!empty($item['parent'])) {
 463                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 464                         while ($parent = Item::fetch($parents)) {
 465                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 466                                         $profile = APContact::getByURL($parent['owner-link'], false);
 467                                         if (!empty($profile)) {
 468                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 469                                                         // Comments to forums are directed to the forum
 470                                                         // But comments to forums aren't directed to the followers collection
 471                                                         if ($profile['type'] == 'Group') {
 472                                                                 $data['to'][] = $profile['url'];
 473                                                         } else {
 474                                                                 $data['cc'][] = $profile['url'];
 475                                                                 if (($item['private'] != Item::PRIVATE) && $item['private'] && !empty($actor_profile['followers'])) {
 476                                                                         $data['cc'][] = $actor_profile['followers'];
 477                                                                 }
 478                                                         }
 479                                                 } else {
 480                                                         // Public thread parent post always are directed to the followers
 481                                                         if (($item['private'] != Item::PRIVATE) && !$forum_mode) {
 482                                                                 $data['cc'][] = $actor_profile['followers'];
 483                                                         }
 484                                                 }
 485                                         }
 486                                 }
 487
 488                                 // Don't include data from future posts
 489                                 if ($parent['id'] >= $last_id) {
 490                                         continue;
 491                                 }
 492
 493                                 $profile = APContact::getByURL($parent['author-link'], false);
 494                                 if (!empty($profile)) {
 495                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 496                                                 $data['to'][] = $profile['url'];
 497                                         } else {
 498                                                 $data['cc'][] = $profile['url'];
 499                                         }
 500                                 }
 501                         }
 502                         DBA::close($parents);
 503                 }
 504
 505                 $data['to'] = array_unique($data['to']);
 506                 $data['cc'] = array_unique($data['cc']);
 507                 $data['bcc'] = array_unique($data['bcc']);
 508
 509                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 510                         unset($data['to'][$key]);
 511                 }
 512
 513                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 514                         unset($data['cc'][$key]);
 515                 }
 516
 517                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 518                         unset($data['bcc'][$key]);
 519                 }
 520
 521                 foreach ($data['to'] as $to) {
 522                         if (($key = array_search($to, $data['cc'])) !== false) {
 523                                 unset($data['cc'][$key]);
 524                         }
 525
 526                         if (($key = array_search($to, $data['bcc'])) !== false) {
 527                                 unset($data['bcc'][$key]);
 528                         }
 529                 }
 530
 531                 foreach ($data['cc'] as $cc) {
 532                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 533                                 unset($data['bcc'][$key]);
 534                         }
 535                 }
 536
 537                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 538
 539                 if (!$blindcopy) {
 540                         unset($receivers['bcc']);
 541                 }
 542
 543                 return $receivers;
 544         }
 545
 546         /**
 547          * Check if an inbox is archived
 548          *
 549          * @param string $url Inbox url
 550          *
 551          * @return boolean "true" if inbox is archived
 552          */
 553         private static function archivedInbox($url)
 554         {
 555                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 556         }
 557
 558         /**
 559          * Fetches a list of inboxes of followers of a given user
 560          *
 561          * @param integer $uid      User ID
 562          * @param boolean $personal fetch personal inboxes
 563          *
 564          * @return array of follower inboxes
 565          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 566          * @throws \ImagickException
 567          */
 568         public static function fetchTargetInboxesforUser($uid, $personal = false)
 569         {
 570                 $inboxes = [];
 571
 572                 if (DI::config()->get('debug', 'total_ap_delivery')) {
 573                         // Will be activated in a later step
 574                         $networks = Protocol::FEDERATED;
 575                 } else {
 576                         // For now only send to these contacts:
 577                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 578                 }
 579
 580                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 581
 582                 if (!empty($uid)) {
 583                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 584                 }
 585
 586                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 587                 while ($contact = DBA::fetch($contacts)) {
 588                         if (Contact::isLocal($contact['url'])) {
 589                                 continue;
 590                         }
 591
 592                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 593                                 continue;
 594                         }
 595
 596                         if (Network::isUrlBlocked($contact['url'])) {
 597                                 continue;
 598                         }
 599
 600                         $profile = APContact::getByURL($contact['url'], false);
 601                         if (!empty($profile)) {
 602                                 if (empty($profile['sharedinbox']) || $personal) {
 603                                         $target = $profile['inbox'];
 604                                 } else {
 605                                         $target = $profile['sharedinbox'];
 606                                 }
 607                                 if (!self::archivedInbox($target)) {
 608                                         $inboxes[$target] = $target;
 609                                 }
 610                         }
 611                 }
 612                 DBA::close($contacts);
 613
 614                 return $inboxes;
 615         }
 616
 617         /**
 618          * Fetches an array of inboxes for the given item and user
 619          *
 620          * @param array   $item       Item array
 621          * @param integer $uid        User ID
 622          * @param boolean $personal   fetch personal inboxes
 623          * @param integer $last_id    Last item id for adding receivers
 624          * @param boolean $forum_mode "true" means that we are sending content to a forum
 625          * @return array with inboxes
 626          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 627          * @throws \ImagickException
 628          */
 629         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 630         {
 631                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 632                 if (empty($permissions)) {
 633                         return [];
 634                 }
 635
 636                 $inboxes = [];
 637
 638                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 639                         $item_profile = APContact::getByURL($item['author-link'], false);
 640                 } else {
 641                         $item_profile = APContact::getByURL($item['owner-link'], false);
 642                 }
 643
 644                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 645                         if (empty($permissions[$element])) {
 646                                 continue;
 647                         }
 648
 649                         $blindcopy = in_array($element, ['bto', 'bcc']);
 650
 651                         foreach ($permissions[$element] as $receiver) {
 652                                 if (Network::isUrlBlocked($receiver)) {
 653                                         continue;
 654                                 }
 655
 656                                 if ($receiver == $item_profile['followers']) {
 657                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 658                                 } else {
 659                                         if (Contact::isLocal($receiver)) {
 660                                                 continue;
 661                                         }
 662
 663                                         $profile = APContact::getByURL($receiver, false);
 664                                         if (!empty($profile)) {
 665                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 666                                                         $target = $profile['inbox'];
 667                                                 } else {
 668                                                         $target = $profile['sharedinbox'];
 669                                                 }
 670                                                 if (!self::archivedInbox($target)) {
 671                                                         $inboxes[$target] = $target;
 672                                                 }
 673                                         }
 674                                 }
 675                         }
 676                 }
 677
 678                 return $inboxes;
 679         }
 680
 681         /**
 682          * Creates an array in the structure of the item table for a given mail id
 683          *
 684          * @param integer $mail_id
 685          *
 686          * @return array
 687          * @throws \Exception
 688          */
 689         public static function ItemArrayFromMail($mail_id)
 690         {
 691                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 692                 if (!DBA::isResult($mail)) {
 693                         return [];
 694                 }
 695
 696                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 697
 698                 // Making the post more compatible for Mastodon by:
 699                 // - Making it a note and not an article (no title)
 700                 // - Moving the title into the "summary" field that is used as a "content warning"
 701                 $mail['body'] = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
 702                 $mail['title'] = '';
 703
 704                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 705                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 706                 $mail['allow_gid'] = '';
 707                 $mail['deny_cid'] = '';
 708                 $mail['deny_gid'] = '';
 709                 $mail['private'] = true;
 710                 $mail['deleted'] = false;
 711                 $mail['edited'] = $mail['created'];
 712                 $mail['plink'] = $mail['uri'];
 713                 $mail['thr-parent'] = $reply['uri'];
 714                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 715
 716                 $mail['event-type'] = '';
 717                 $mail['attach'] = '';
 718
 719                 $mail['parent'] = 0;
 720
 721                 return $mail;
 722         }
 723
 724         /**
 725          * Creates an activity array for a given mail id
 726          *
 727          * @param integer $mail_id
 728          * @param boolean $object_mode Is the activity item is used inside another object?
 729          *
 730          * @return array of activity
 731          * @throws \Exception
 732          */
 733         public static function createActivityFromMail($mail_id, $object_mode = false)
 734         {
 735                 $mail = self::ItemArrayFromMail($mail_id);
 736                 $object = self::createNote($mail);
 737
 738                 if (!$object_mode) {
 739                         $data = ['@context' => ActivityPub::CONTEXT];
 740                 } else {
 741                         $data = [];
 742                 }
 743
 744                 $data['id'] = $mail['uri'] . '#Create';
 745                 $data['type'] = 'Create';
 746                 $data['actor'] = $mail['author-link'];
 747                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 748                 $data['instrument'] = self::getService();
 749                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 750
 751                 if (empty($data['to']) && !empty($data['cc'])) {
 752                         $data['to'] = $data['cc'];
 753                 }
 754
 755                 if (empty($data['to']) && !empty($data['bcc'])) {
 756                         $data['to'] = $data['bcc'];
 757                 }
 758
 759                 unset($data['cc']);
 760                 unset($data['bcc']);
 761
 762                 $object['to'] = $data['to'];
 763                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => '']];
 764
 765                 unset($object['cc']);
 766                 unset($object['bcc']);
 767
 768                 $data['directMessage'] = true;
 769
 770                 $data['object'] = $object;
 771
 772                 $owner = User::getOwnerDataById($mail['uid']);
 773
 774                 if (!$object_mode && !empty($owner)) {
 775                         return LDSignature::sign($data, $owner);
 776                 } else {
 777                         return $data;
 778                 }
 779         }
 780
 781         /**
 782          * Returns the activity type of a given item
 783          *
 784          * @param array $item
 785          *
 786          * @return string with activity type
 787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 788          * @throws \ImagickException
 789          */
 790         private static function getTypeOfItem($item)
 791         {
 792                 $reshared = false;
 793
 794                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 795                 if (strpos($item['body'], "[share") === 0) {
 796                         $announce = self::getAnnounceArray($item);
 797                         $reshared = !empty($announce);
 798                 }
 799
 800                 if ($reshared) {
 801                         $type = 'Announce';
 802                 } elseif ($item['verb'] == Activity::POST) {
 803                         if ($item['created'] == $item['edited']) {
 804                                 $type = 'Create';
 805                         } else {
 806                                 $type = 'Update';
 807                         }
 808                 } elseif ($item['verb'] == Activity::LIKE) {
 809                         $type = 'Like';
 810                 } elseif ($item['verb'] == Activity::DISLIKE) {
 811                         $type = 'Dislike';
 812                 } elseif ($item['verb'] == Activity::ATTEND) {
 813                         $type = 'Accept';
 814                 } elseif ($item['verb'] == Activity::ATTENDNO) {
 815                         $type = 'Reject';
 816                 } elseif ($item['verb'] == Activity::ATTENDMAYBE) {
 817                         $type = 'TentativeAccept';
 818                 } elseif ($item['verb'] == Activity::FOLLOW) {
 819                         $type = 'Follow';
 820                 } elseif ($item['verb'] == Activity::TAG) {
 821                         $type = 'Add';
 822                 } else {
 823                         $type = '';
 824                 }
 825
 826                 return $type;
 827         }
 828
 829         /**
 830          * Creates the activity or fetches it from the cache
 831          *
 832          * @param integer $item_id
 833          * @param boolean $force Force new cache entry
 834          *
 835          * @return array with the activity
 836          * @throws \Exception
 837          */
 838         public static function createCachedActivityFromItem($item_id, $force = false)
 839         {
 840                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 841
 842                 if (!$force) {
 843                         $data = DI::cache()->get($cachekey);
 844                         if (!is_null($data)) {
 845                                 return $data;
 846                         }
 847                 }
 848
 849                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 850
 851                 DI::cache()->set($cachekey, $data, Duration::QUARTER_HOUR);
 852                 return $data;
 853         }
 854
 855         /**
 856          * Creates an activity array for a given item id
 857          *
 858          * @param integer $item_id
 859          * @param boolean $object_mode Is the activity item is used inside another object?
 860          *
 861          * @return array of activity
 862          * @throws \Exception
 863          */
 864         public static function createActivityFromItem($item_id, $object_mode = false)
 865         {
 866                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 867
 868                 if (!DBA::isResult($item)) {
 869                         return false;
 870                 }
 871
 872                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 873                         $owner = User::getOwnerDataById($item['uid']);
 874                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 875                                 $type = 'Announce';
 876
 877                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 878                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 879                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 880                         }
 881                 }
 882
 883                 if (empty($type)) {
 884                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 885                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 886                         if (DBA::isResult($conversation)) {
 887                                 $data = json_decode($conversation['source'], true);
 888                                 if (!empty($data)) {
 889                                         return $data;
 890                                 }
 891                         }
 892
 893                         $type = self::getTypeOfItem($item);
 894                 }
 895
 896                 if (!$object_mode) {
 897                         $data = ['@context' => ActivityPub::CONTEXT];
 898
 899                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 900                                 $type = 'Undo';
 901                         } elseif ($item['deleted']) {
 902                                 $type = 'Delete';
 903                         }
 904                 } else {
 905                         $data = [];
 906                 }
 907
 908                 $data['id'] = $item['uri'] . '#' . $type;
 909                 $data['type'] = $type;
 910
 911                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 912                         $data['actor'] = $item['author-link'];
 913                 } else {
 914                         $data['actor'] = $item['owner-link'];
 915                 }
 916
 917                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 918
 919                 $data['instrument'] = self::getService();
 920
 921                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 922
 923                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 924                         $data['object'] = self::createNote($item);
 925                 } elseif ($data['type'] == 'Add') {
 926                         $data = self::createAddTag($item, $data);
 927                 } elseif ($data['type'] == 'Announce') {
 928                         $data = self::createAnnounce($item, $data);
 929                 } elseif ($data['type'] == 'Follow') {
 930                         $data['object'] = $item['parent-uri'];
 931                 } elseif ($data['type'] == 'Undo') {
 932                         $data['object'] = self::createActivityFromItem($item_id, true);
 933                 } else {
 934                         $data['diaspora:guid'] = $item['guid'];
 935                         if (!empty($item['signed_text'])) {
 936                                 $data['diaspora:like'] = $item['signed_text'];
 937                         }
 938                         $data['object'] = $item['thr-parent'];
 939                 }
 940
 941                 if (!empty($item['contact-uid'])) {
 942                         $uid = $item['contact-uid'];
 943                 } else {
 944                         $uid = $item['uid'];
 945                 }
 946
 947                 $owner = User::getOwnerDataById($uid);
 948
 949                 if (!$object_mode && !empty($owner)) {
 950                         return LDSignature::sign($data, $owner);
 951                 } else {
 952                         return $data;
 953                 }
 954
 955                 /// @todo Create "conversation" entry
 956         }
 957
 958         /**
 959          * Creates a location entry for a given item array
 960          *
 961          * @param array $item
 962          *
 963          * @return array with location array
 964          */
 965         private static function createLocation($item)
 966         {
 967                 $location = ['type' => 'Place'];
 968
 969                 if (!empty($item['location'])) {
 970                         $location['name'] = $item['location'];
 971                 }
 972
 973                 $coord = [];
 974
 975                 if (empty($item['coord'])) {
 976                         $coord = Map::getCoordinates($item['location']);
 977                 } else {
 978                         $coords = explode(' ', $item['coord']);
 979                         if (count($coords) == 2) {
 980                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 981                         }
 982                 }
 983
 984                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 985                         $location['latitude'] = $coord['lat'];
 986                         $location['longitude'] = $coord['lon'];
 987                 }
 988
 989                 return $location;
 990         }
 991
 992         /**
 993          * Returns a tag array for a given item array
 994          *
 995          * @param array $item
 996          *
 997          * @return array of tags
 998          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 999          */
1000         private static function createTagList($item)
1001         {
1002                 $tags = [];
1003
1004                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
1005                 foreach ($terms as $term) {
1006                         if ($term['type'] == Term::HASHTAG) {
1007                                 $url = DI::baseUrl() . '/search?tag=' . urlencode($term['term']);
1008                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
1009                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
1010                                 $contact = Contact::getDetailsByURL($term['url']);
1011                                 if (!empty($contact['addr'])) {
1012                                         $mention = '@' . $contact['addr'];
1013                                 } else {
1014                                         $mention = '@' . $term['url'];
1015                                 }
1016
1017                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
1018                         }
1019                 }
1020
1021                 $announce = self::getAnnounceArray($item);
1022                 // Mention the original author upon commented reshares
1023                 if (!empty($announce['comment'])) {
1024                         $tags[] = ['type' => 'Mention', 'href' => $announce['actor']['url'], 'name' => '@' . $announce['actor']['addr']];
1025                 }
1026
1027                 return $tags;
1028         }
1029
1030         /**
1031          * Adds attachment data to the JSON document
1032          *
1033          * @param array  $item Data of the item that is to be posted
1034          * @param string $type Object type
1035          *
1036          * @return array with attachment data
1037          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1038          */
1039         private static function createAttachmentList($item, $type)
1040         {
1041                 $attachments = [];
1042
1043                 // Currently deactivated, since it creates side effects on Mastodon and Pleroma.
1044                 // It will be reactivated, once this cleared.
1045                 /*
1046                 $attach_data = BBCode::getAttachmentData($item['body']);
1047                 if (!empty($attach_data['url'])) {
1048                         $attachment = ['type' => 'Page',
1049                                 'mediaType' => 'text/html',
1050                                 'url' => $attach_data['url']];
1051
1052                         if (!empty($attach_data['title'])) {
1053                                 $attachment['name'] = $attach_data['title'];
1054                         }
1055
1056                         if (!empty($attach_data['description'])) {
1057                                 $attachment['summary'] = $attach_data['description'];
1058                         }
1059
1060                         if (!empty($attach_data['image'])) {
1061                                 $imgdata = Images::getInfoFromURLCached($attach_data['image']);
1062                                 if ($imgdata) {
1063                                         $attachment['icon'] = ['type' => 'Image',
1064                                                 'mediaType' => $imgdata['mime'],
1065                                                 'width' => $imgdata[0],
1066                                                 'height' => $imgdata[1],
1067                                                 'url' => $attach_data['image']];
1068                                 }
1069                         }
1070
1071                         $attachments[] = $attachment;
1072                 }
1073                 */
1074                 $arr = explode('[/attach],', $item['attach']);
1075                 if (count($arr)) {
1076                         foreach ($arr as $r) {
1077                                 $matches = false;
1078                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1079                                 if ($cnt) {
1080                                         $attributes = ['type' => 'Document',
1081                                                         'mediaType' => $matches[3],
1082                                                         'url' => $matches[1],
1083                                                         'name' => null];
1084
1085                                         if (trim($matches[4]) != '') {
1086                                                 $attributes['name'] = trim($matches[4]);
1087                                         }
1088
1089                                         $attachments[] = $attributes;
1090                                 }
1091                         }
1092                 }
1093
1094                 if ($type != 'Note') {
1095                         return $attachments;
1096                 }
1097
1098                 // Simplify image codes
1099                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1100
1101                 // Grab all pictures without alternative descriptions and create attachments out of them
1102                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1103                         foreach ($pictures[1] as $picture) {
1104                                 $imgdata = Images::getInfoFromURLCached($picture);
1105                                 if ($imgdata) {
1106                                         $attachments[] = ['type' => 'Document',
1107                                                 'mediaType' => $imgdata['mime'],
1108                                                 'url' => $picture,
1109                                                 'name' => null];
1110                                 }
1111                         }
1112                 }
1113
1114                 // Grab all pictures with alternative description and create attachments out of them
1115                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
1116                         foreach ($pictures as $picture) {
1117                                 $imgdata = Images::getInfoFromURLCached($picture[1]);
1118                                 if ($imgdata) {
1119                                         $attachments[] = ['type' => 'Document',
1120                                                 'mediaType' => $imgdata['mime'],
1121                                                 'url' => $picture[1],
1122                                                 'name' => $picture[2]];
1123                                 }
1124                         }
1125                 }
1126
1127                 return $attachments;
1128         }
1129
1130         /**
1131          * Callback function to replace a Friendica style mention in a mention that is used on AP
1132          *
1133          * @param array $match Matching values for the callback
1134          * @return string Replaced mention
1135          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1136          */
1137         private static function mentionCallback($match)
1138         {
1139                 if (empty($match[1])) {
1140                         return '';
1141                 }
1142
1143                 $data = Contact::getDetailsByURL($match[1]);
1144                 if (empty($data['nick'])) {
1145                         return $match[0];
1146                 }
1147
1148                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1149         }
1150
1151         /**
1152          * Remove image elements since they are added as attachment
1153          *
1154          * @param string $body
1155          *
1156          * @return string with removed images
1157          */
1158         private static function removePictures($body)
1159         {
1160                 // Simplify image codes
1161                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1162                 $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
1163
1164                 // Now remove local links
1165                 $body = preg_replace_callback(
1166                         '/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi',
1167                         function ($match) {
1168                                 // We remove the link when it is a link to a local photo page
1169                                 if (Photo::isLocalPage($match[1])) {
1170                                         return '';
1171                                 }
1172                                 // otherwise we just return the link
1173                                 return '[url]' . $match[1] . '[/url]';
1174                         },
1175                         $body
1176                 );
1177
1178                 // Remove all pictures
1179                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '', $body);
1180
1181                 return $body;
1182         }
1183
1184         /**
1185          * Fetches the "context" value for a givem item array from the "conversation" table
1186          *
1187          * @param array $item
1188          *
1189          * @return string with context url
1190          * @throws \Exception
1191          */
1192         private static function fetchContextURLForItem($item)
1193         {
1194                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1195                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1196                         $context_uri = $conversation['conversation-href'];
1197                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1198                         $context_uri = $conversation['conversation-uri'];
1199                 } else {
1200                         $context_uri = $item['parent-uri'] . '#context';
1201                 }
1202                 return $context_uri;
1203         }
1204
1205         /**
1206          * Returns if the post contains sensitive content ("nsfw")
1207          *
1208          * @param integer $item_id
1209          *
1210          * @return boolean
1211          * @throws \Exception
1212          */
1213         private static function isSensitive($item_id)
1214         {
1215                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
1216                 return DBA::exists('term', $condition);
1217         }
1218
1219         /**
1220          * Creates event data
1221          *
1222          * @param array $item
1223          *
1224          * @return array with the event data
1225          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1226          */
1227         public static function createEvent($item)
1228         {
1229                 $event = [];
1230                 $event['name'] = $item['event-summary'];
1231                 $event['content'] = BBCode::convert($item['event-desc'], false, 9);
1232                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1233
1234                 if (!$item['event-nofinish']) {
1235                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1236                 }
1237
1238                 if (!empty($item['event-location'])) {
1239                         $item['location'] = $item['event-location'];
1240                         $event['location'] = self::createLocation($item);
1241                 }
1242
1243                 return $event;
1244         }
1245
1246         /**
1247          * Creates a note/article object array
1248          *
1249          * @param array $item
1250          *
1251          * @return array with the object data
1252          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1253          * @throws \ImagickException
1254          */
1255         public static function createNote($item)
1256         {
1257                 if (empty($item)) {
1258                         return [];
1259                 }
1260
1261                 if ($item['event-type'] == 'event') {
1262                         $type = 'Event';
1263                 } elseif (!empty($item['title'])) {
1264                         $type = 'Article';
1265                 } else {
1266                         $type = 'Note';
1267                 }
1268
1269                 if ($item['deleted']) {
1270                         $type = 'Tombstone';
1271                 }
1272
1273                 $data = [];
1274                 $data['id'] = $item['uri'];
1275                 $data['type'] = $type;
1276
1277                 if ($item['deleted']) {
1278                         return $data;
1279                 }
1280
1281                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1282
1283                 if ($item['uri'] != $item['thr-parent']) {
1284                         $data['inReplyTo'] = $item['thr-parent'];
1285                 } else {
1286                         $data['inReplyTo'] = null;
1287                 }
1288
1289                 $data['diaspora:guid'] = $item['guid'];
1290                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1291
1292                 if ($item['created'] != $item['edited']) {
1293                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1294                 }
1295
1296                 $data['url'] = $item['plink'];
1297                 $data['attributedTo'] = $item['author-link'];
1298                 $data['sensitive'] = self::isSensitive($item['id']);
1299                 $data['context'] = self::fetchContextURLForItem($item);
1300
1301                 if (!empty($item['title'])) {
1302                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1303                 }
1304
1305                 $permission_block = self::createPermissionBlockForItem($item, false);
1306
1307                 $body = $item['body'];
1308
1309                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1310                         $body = self::prependMentions($body, $permission_block);
1311                 }
1312
1313                 if ($type == 'Note') {
1314                         $body = self::removePictures($body);
1315                 } elseif (($type == 'Article') && empty($data['summary'])) {
1316                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1317                 }
1318
1319                 if ($type == 'Event') {
1320                         $data = array_merge($data, self::createEvent($item));
1321                 } else {
1322                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1323                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1324
1325                         $data['content'] = BBCode::convert($body, false, 9);
1326                 }
1327
1328                 // The regular "content" field does contain a minimized HTML. This is done since systems like
1329                 // Mastodon has got problems with - for example - embedded pictures.
1330                 // The contentMap does contain the unmodified HTML.
1331                 $language = self::getLanguage($item);
1332                 if (!empty($language)) {
1333                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1334                         $richbody = preg_replace_callback($regexp, ['self', 'mentionCallback'], $item['body']);
1335                         $richbody = BBCode::removeAttachment($richbody);
1336
1337                         $data['contentMap'][$language] = BBCode::convert($richbody, false);
1338                 }
1339
1340                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1341
1342                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1343                         $data['diaspora:comment'] = $item['signed_text'];
1344                 }
1345
1346                 $data['attachment'] = self::createAttachmentList($item, $type);
1347                 $data['tag'] = self::createTagList($item);
1348
1349                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1350                         $data['location'] = self::createLocation($item);
1351                 }
1352
1353                 if (!empty($item['app'])) {
1354                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1355                 }
1356
1357                 $data = array_merge($data, $permission_block);
1358
1359                 return $data;
1360         }
1361
1362         /**
1363          * Fetches the language from the post, the user or the system.
1364          *
1365          * @param array $item
1366          *
1367          * @return string language string
1368          */
1369         private static function getLanguage(array $item)
1370         {
1371                 // Try to fetch the language from the post itself
1372                 if (!empty($item['language'])) {
1373                         $languages = array_keys(json_decode($item['language'], true));
1374                         if (!empty($languages[0])) {
1375                                 return $languages[0];
1376                         }
1377                 }
1378
1379                 // Otherwise use the user's language
1380                 if (!empty($item['uid'])) {
1381                         $user = DBA::selectFirst('user', ['language'], ['uid' => $item['uid']]);
1382                         if (!empty($user['language'])) {
1383                                 return $user['language'];
1384                         }
1385                 }
1386
1387                 // And finally just use the system language
1388                 return DI::config()->get('system', 'language');
1389         }
1390
1391         /**
1392          * Creates an an "add tag" entry
1393          *
1394          * @param array $item
1395          * @param array $data activity data
1396          *
1397          * @return array with activity data for adding tags
1398          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1399          * @throws \ImagickException
1400          */
1401         private static function createAddTag($item, $data)
1402         {
1403                 $object = XML::parseString($item['object'], false);
1404                 $target = XML::parseString($item["target"], false);
1405
1406                 $data['diaspora:guid'] = $item['guid'];
1407                 $data['actor'] = $item['author-link'];
1408                 $data['target'] = (string)$target->id;
1409                 $data['summary'] = BBCode::toPlaintext($item['body']);
1410                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1411
1412                 return $data;
1413         }
1414
1415         /**
1416          * Creates an announce object entry
1417          *
1418          * @param array $item
1419          * @param array $data activity data
1420          *
1421          * @return array with activity data
1422          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1423          * @throws \ImagickException
1424          */
1425         private static function createAnnounce($item, $data)
1426         {
1427                 $orig_body = $item['body'];
1428                 $announce = self::getAnnounceArray($item);
1429                 if (empty($announce)) {
1430                         $data['type'] = 'Create';
1431                         $data['object'] = self::createNote($item);
1432                         return $data;
1433                 }
1434
1435                 if (empty($announce['comment'])) {
1436                         // Pure announce, without a quote
1437                         $data['type'] = 'Announce';
1438                         $data['object'] = $announce['object']['uri'];
1439                         return $data;
1440                 }
1441
1442                 // Quote
1443                 $data['type'] = 'Create';
1444                 $item['body'] = $announce['comment'] . "\n" . $announce['object']['plink'];
1445                 $data['object'] = self::createNote($item);
1446
1447                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1448                 $data['object']['attachment'][] = self::createNote($announce['object']);
1449
1450                 $data['object']['source']['content'] = $orig_body;
1451                 return $data;
1452         }
1453
1454         /**
1455          * Return announce related data if the item is an annunce
1456          *
1457          * @param array $item
1458          *
1459          * @return array
1460          */
1461         public static function getAnnounceArray($item)
1462         {
1463                 $reshared = Item::getShareArray($item);
1464                 if (empty($reshared['guid'])) {
1465                         return [];
1466                 }
1467
1468                 $reshared_item = Item::selectFirst([], ['guid' => $reshared['guid']]);
1469                 if (!DBA::isResult($reshared_item)) {
1470                         return [];
1471                 }
1472
1473                 if (!in_array($reshared_item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1474                         return [];
1475                 }
1476
1477                 $profile = APContact::getByURL($reshared_item['author-link'], false);
1478                 if (empty($profile)) {
1479                         return [];
1480                 }
1481
1482                 return ['object' => $reshared_item, 'actor' => $profile, 'comment' => $reshared['comment']];
1483         }
1484
1485         /**
1486          * Checks if the provided item array is an announce
1487          *
1488          * @param array $item
1489          *
1490          * @return boolean
1491          */
1492         public static function isAnnounce($item)
1493         {
1494                 $announce = self::getAnnounceArray($item);
1495                 if (empty($announce)) {
1496                         return false;
1497                 }
1498
1499                 return empty($announce['comment']);
1500         }
1501
1502         /**
1503          * Creates an activity id for a given contact id
1504          *
1505          * @param integer $cid Contact ID of target
1506          *
1507          * @return bool|string activity id
1508          */
1509         public static function activityIDFromContact($cid)
1510         {
1511                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1512                 if (!DBA::isResult($contact)) {
1513                         return false;
1514                 }
1515
1516                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1517                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1518                 return DI::baseUrl() . '/activity/' . $uuid;
1519         }
1520
1521         /**
1522          * Transmits a contact suggestion to a given inbox
1523          *
1524          * @param integer $uid           User ID
1525          * @param string  $inbox         Target inbox
1526          * @param integer $suggestion_id Suggestion ID
1527          *
1528          * @return boolean was the transmission successful?
1529          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1530          */
1531         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1532         {
1533                 $owner = User::getOwnerDataById($uid);
1534
1535                 $suggestion = DI::fsuggest()->getById($suggestion_id);
1536
1537                 $data = ['@context' => ActivityPub::CONTEXT,
1538                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1539                         'type' => 'Announce',
1540                         'actor' => $owner['url'],
1541                         'object' => $suggestion->url,
1542                         'content' => $suggestion->note,
1543                         'instrument' => self::getService(),
1544                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1545                         'cc' => []];
1546
1547                 $signed = LDSignature::sign($data, $owner);
1548
1549                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1550                 return HTTPSignature::transmit($signed, $inbox, $uid);
1551         }
1552
1553         /**
1554          * Transmits a profile relocation to a given inbox
1555          *
1556          * @param integer $uid   User ID
1557          * @param string  $inbox Target inbox
1558          *
1559          * @return boolean was the transmission successful?
1560          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1561          */
1562         public static function sendProfileRelocation($uid, $inbox)
1563         {
1564                 $owner = User::getOwnerDataById($uid);
1565
1566                 $data = ['@context' => ActivityPub::CONTEXT,
1567                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1568                         'type' => 'dfrn:relocate',
1569                         'actor' => $owner['url'],
1570                         'object' => $owner['url'],
1571                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1572                         'instrument' => self::getService(),
1573                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1574                         'cc' => []];
1575
1576                 $signed = LDSignature::sign($data, $owner);
1577
1578                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1579                 return HTTPSignature::transmit($signed, $inbox, $uid);
1580         }
1581
1582         /**
1583          * Transmits a profile deletion to a given inbox
1584          *
1585          * @param integer $uid   User ID
1586          * @param string  $inbox Target inbox
1587          *
1588          * @return boolean was the transmission successful?
1589          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1590          */
1591         public static function sendProfileDeletion($uid, $inbox)
1592         {
1593                 $owner = User::getOwnerDataById($uid);
1594
1595                 if (empty($owner)) {
1596                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1597                         return false;
1598                 }
1599
1600                 if (empty($owner['uprvkey'])) {
1601                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1602                         return false;
1603                 }
1604
1605                 $data = ['@context' => ActivityPub::CONTEXT,
1606                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1607                         'type' => 'Delete',
1608                         'actor' => $owner['url'],
1609                         'object' => $owner['url'],
1610                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1611                         'instrument' => self::getService(),
1612                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1613                         'cc' => []];
1614
1615                 $signed = LDSignature::sign($data, $owner);
1616
1617                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1618                 return HTTPSignature::transmit($signed, $inbox, $uid);
1619         }
1620
1621         /**
1622          * Transmits a profile change to a given inbox
1623          *
1624          * @param integer $uid   User ID
1625          * @param string  $inbox Target inbox
1626          *
1627          * @return boolean was the transmission successful?
1628          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1629          * @throws \ImagickException
1630          */
1631         public static function sendProfileUpdate($uid, $inbox)
1632         {
1633                 $owner = User::getOwnerDataById($uid);
1634                 $profile = APContact::getByURL($owner['url']);
1635
1636                 $data = ['@context' => ActivityPub::CONTEXT,
1637                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1638                         'type' => 'Update',
1639                         'actor' => $owner['url'],
1640                         'object' => self::getProfile($uid),
1641                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1642                         'instrument' => self::getService(),
1643                         'to' => [$profile['followers']],
1644                         'cc' => []];
1645
1646                 $signed = LDSignature::sign($data, $owner);
1647
1648                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1649                 return HTTPSignature::transmit($signed, $inbox, $uid);
1650         }
1651
1652         /**
1653          * Transmits a given activity to a target
1654          *
1655          * @param string  $activity Type name
1656          * @param string  $target   Target profile
1657          * @param integer $uid      User ID
1658          * @return bool
1659          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1660          * @throws \ImagickException
1661          * @throws \Exception
1662          */
1663         public static function sendActivity($activity, $target, $uid, $id = '')
1664         {
1665                 $profile = APContact::getByURL($target);
1666                 if (empty($profile['inbox'])) {
1667                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1668                         return;
1669                 }
1670
1671                 $owner = User::getOwnerDataById($uid);
1672
1673                 if (empty($id)) {
1674                         $id = DI::baseUrl() . '/activity/' . System::createGUID();
1675                 }
1676
1677                 $data = ['@context' => ActivityPub::CONTEXT,
1678                         'id' => $id,
1679                         'type' => $activity,
1680                         'actor' => $owner['url'],
1681                         'object' => $profile['url'],
1682                         'instrument' => self::getService(),
1683                         'to' => [$profile['url']]];
1684
1685                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1686
1687                 $signed = LDSignature::sign($data, $owner);
1688                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1689         }
1690
1691         /**
1692          * Transmits a "follow object" activity to a target
1693          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1694          *
1695          * @param string  $object Object URL
1696          * @param string  $target Target profile
1697          * @param integer $uid    User ID
1698          * @return bool
1699          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1700          * @throws \ImagickException
1701          * @throws \Exception
1702          */
1703         public static function sendFollowObject($object, $target, $uid = 0)
1704         {
1705                 $profile = APContact::getByURL($target);
1706                 if (empty($profile['inbox'])) {
1707                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1708                         return;
1709                 }
1710
1711                 if (empty($uid)) {
1712                         // Fetch the list of administrators
1713                         $admin_mail = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
1714
1715                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1716                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1717                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1718                         $uid = $first_user['uid'];
1719                 }
1720
1721                 $condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1722                         'author-id' => Contact::getPublicIdByUserId($uid)];
1723                 if (Item::exists($condition)) {
1724                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1725                         return false;
1726                 }
1727
1728                 $owner = User::getOwnerDataById($uid);
1729
1730                 $data = ['@context' => ActivityPub::CONTEXT,
1731                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1732                         'type' => 'Follow',
1733                         'actor' => $owner['url'],
1734                         'object' => $object,
1735                         'instrument' => self::getService(),
1736                         'to' => [$profile['url']]];
1737
1738                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1739
1740                 $signed = LDSignature::sign($data, $owner);
1741                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1742         }
1743
1744         /**
1745          * Transmit a message that the contact request had been accepted
1746          *
1747          * @param string  $target Target profile
1748          * @param         $id
1749          * @param integer $uid    User ID
1750          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1751          * @throws \ImagickException
1752          */
1753         public static function sendContactAccept($target, $id, $uid)
1754         {
1755                 $profile = APContact::getByURL($target);
1756                 if (empty($profile['inbox'])) {
1757                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1758                         return;
1759                 }
1760
1761                 $owner = User::getOwnerDataById($uid);
1762                 $data = ['@context' => ActivityPub::CONTEXT,
1763                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1764                         'type' => 'Accept',
1765                         'actor' => $owner['url'],
1766                         'object' => [
1767                                 'id' => (string)$id,
1768                                 'type' => 'Follow',
1769                                 'actor' => $profile['url'],
1770                                 'object' => $owner['url']
1771                         ],
1772                         'instrument' => self::getService(),
1773                         'to' => [$profile['url']]];
1774
1775                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1776
1777                 $signed = LDSignature::sign($data, $owner);
1778                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1779         }
1780
1781         /**
1782          * Reject a contact request or terminates the contact relation
1783          *
1784          * @param string  $target Target profile
1785          * @param         $id
1786          * @param integer $uid    User ID
1787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1788          * @throws \ImagickException
1789          */
1790         public static function sendContactReject($target, $id, $uid)
1791         {
1792                 $profile = APContact::getByURL($target);
1793                 if (empty($profile['inbox'])) {
1794                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1795                         return;
1796                 }
1797
1798                 $owner = User::getOwnerDataById($uid);
1799                 $data = ['@context' => ActivityPub::CONTEXT,
1800                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1801                         'type' => 'Reject',
1802                         'actor' => $owner['url'],
1803                         'object' => [
1804                                 'id' => (string)$id,
1805                                 'type' => 'Follow',
1806                                 'actor' => $profile['url'],
1807                                 'object' => $owner['url']
1808                         ],
1809                         'instrument' => self::getService(),
1810                         'to' => [$profile['url']]];
1811
1812                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1813
1814                 $signed = LDSignature::sign($data, $owner);
1815                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1816         }
1817
1818         /**
1819          * Transmits a message that we don't want to follow this contact anymore
1820          *
1821          * @param string  $target Target profile
1822          * @param integer $uid    User ID
1823          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1824          * @throws \ImagickException
1825          * @throws \Exception
1826          */
1827         public static function sendContactUndo($target, $cid, $uid)
1828         {
1829                 $profile = APContact::getByURL($target);
1830                 if (empty($profile['inbox'])) {
1831                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1832                         return;
1833                 }
1834
1835                 $object_id = self::activityIDFromContact($cid);
1836                 if (empty($object_id)) {
1837                         return;
1838                 }
1839
1840                 $id = DI::baseUrl() . '/activity/' . System::createGUID();
1841
1842                 $owner = User::getOwnerDataById($uid);
1843                 $data = ['@context' => ActivityPub::CONTEXT,
1844                         'id' => $id,
1845                         'type' => 'Undo',
1846                         'actor' => $owner['url'],
1847                         'object' => ['id' => $object_id, 'type' => 'Follow',
1848                                 'actor' => $owner['url'],
1849                                 'object' => $profile['url']],
1850                         'instrument' => self::getService(),
1851                         'to' => [$profile['url']]];
1852
1853                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1854
1855                 $signed = LDSignature::sign($data, $owner);
1856                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1857         }
1858
1859         private static function prependMentions($body, array $permission_block)
1860         {
1861                 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1862                         return $body;
1863                 }
1864
1865                 $mentions = [];
1866
1867                 foreach ($permission_block['to'] as $profile_url) {
1868                         $profile = Contact::getDetailsByURL($profile_url);
1869                         if (!empty($profile['addr'])
1870                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1871                                 && !strstr($body, $profile['addr'])
1872                                 && !strstr($body, $profile_url)
1873                         ) {
1874                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1875                         }
1876                 }
1877
1878                 $mentions[] = $body;
1879
1880                 return implode(' ', $mentions);
1881         }
1882 }