src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Content\Feature;
   9 use Friendica\Database\DBA;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\Logger;
  12 use Friendica\Core\System;
  13 use Friendica\Util\HTTPSignature;
  14 use Friendica\Core\Protocol;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Contact;
  17 use Friendica\Model\APContact;
  18 use Friendica\Model\Item;
  19 use Friendica\Model\Term;
  20 use Friendica\Model\User;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\Plaintext;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\LDSignature;
  26 use Friendica\Model\Profile;
  27 use Friendica\Object\Image;
  28 use Friendica\Protocol\ActivityPub;
  29 use Friendica\Core\Cache;
  30 use Friendica\Util\Map;
  31 use Friendica\Util\Network;
  32
  33 require_once 'include/api.php';
  34 require_once 'mod/share.php';
  35
  36 /**
  37  * @brief ActivityPub Transmitter Protocol class
  38  *
  39  * To-Do:
  40  * - Undo Announce
  41  */
  42 class Transmitter
  43 {
  44         /**
  45          * collects the lost of followers of the given owner
  46          *
  47          * @param array   $owner Owner array
  48          * @param integer $page  Page number
  49          *
  50          * @return array of owners
  51          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  52          */
  53         public static function getFollowers($owner, $page = null)
  54         {
  55                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  56                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  57                 $count = DBA::count('contact', $condition);
  58
  59                 $data = ['@context' => ActivityPub::CONTEXT];
  60                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  61                 $data['type'] = 'OrderedCollection';
  62                 $data['totalItems'] = $count;
  63
  64                 // When we hide our friends we will only show the pure number but don't allow more.
  65                 $profile = Profile::getByUID($owner['uid']);
  66                 if (!empty($profile['hide-friends'])) {
  67                         return $data;
  68                 }
  69
  70                 if (empty($page)) {
  71                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  72                 } else {
  73                         $list = [];
  74
  75                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  76                         while ($contact = DBA::fetch($contacts)) {
  77                                 $list[] = $contact['url'];
  78                         }
  79
  80                         if (!empty($list)) {
  81                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  82                         }
  83
  84                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  85
  86                         $data['orderedItems'] = $list;
  87                 }
  88
  89                 return $data;
  90         }
  91
  92         /**
  93          * Create list of following contacts
  94          *
  95          * @param array   $owner Owner array
  96          * @param integer $page  Page numbe
  97          *
  98          * @return array of following contacts
  99          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 100          */
 101         public static function getFollowing($owner, $page = null)
 102         {
 103                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 104                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 105                 $count = DBA::count('contact', $condition);
 106
 107                 $data = ['@context' => ActivityPub::CONTEXT];
 108                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 109                 $data['type'] = 'OrderedCollection';
 110                 $data['totalItems'] = $count;
 111
 112                 // When we hide our friends we will only show the pure number but don't allow more.
 113                 $profile = Profile::getByUID($owner['uid']);
 114                 if (!empty($profile['hide-friends'])) {
 115                         return $data;
 116                 }
 117
 118                 if (empty($page)) {
 119                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 120                 } else {
 121                         $list = [];
 122
 123                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 124                         while ($contact = DBA::fetch($contacts)) {
 125                                 $list[] = $contact['url'];
 126                         }
 127
 128                         if (!empty($list)) {
 129                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 130                         }
 131
 132                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 133
 134                         $data['orderedItems'] = $list;
 135                 }
 136
 137                 return $data;
 138         }
 139
 140         /**
 141          * Public posts for the given owner
 142          *
 143          * @param array   $owner Owner array
 144          * @param integer $page  Page numbe
 145          *
 146          * @return array of posts
 147          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 148          * @throws \ImagickException
 149          */
 150         public static function getOutbox($owner, $page = null)
 151         {
 152                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 153
 154                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 155                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 156                         'deleted' => false, 'visible' => true, 'moderated' => false];
 157                 $count = DBA::count('item', $condition);
 158
 159                 $data = ['@context' => ActivityPub::CONTEXT];
 160                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 161                 $data['type'] = 'OrderedCollection';
 162                 $data['totalItems'] = $count;
 163
 164                 if (empty($page)) {
 165                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 166                 } else {
 167                         $list = [];
 168
 169                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 170
 171                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 172                         while ($item = Item::fetch($items)) {
 173                                 $object = self::createObjectFromItemID($item['id']);
 174                                 unset($object['@context']);
 175                                 $list[] = $object;
 176                         }
 177
 178                         if (!empty($list)) {
 179                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 180                         }
 181
 182                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 183
 184                         $data['orderedItems'] = $list;
 185                 }
 186
 187                 return $data;
 188         }
 189
 190         /**
 191          * Return the service array containing information the used software and it's url
 192          *
 193          * @return array with service data
 194          */
 195         private static function getService()
 196         {
 197                 return ['type' => 'Service',
 198                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 199                         'url' => BaseObject::getApp()->getBaseURL()];
 200         }
 201
 202         /**
 203          * Return the ActivityPub profile of the given user
 204          *
 205          * @param integer $uid User ID
 206          * @return array with profile data
 207          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 208          */
 209         public static function getProfile($uid)
 210         {
 211                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 212                         'account_removed' => false, 'verified' => true];
 213                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 214                 $user = DBA::selectFirst('user', $fields, $condition);
 215                 if (!DBA::isResult($user)) {
 216                         return [];
 217                 }
 218
 219                 $fields = ['locality', 'region', 'country-name'];
 220                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 221                 if (!DBA::isResult($profile)) {
 222                         return [];
 223                 }
 224
 225                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 226                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 227                 if (!DBA::isResult($contact)) {
 228                         return [];
 229                 }
 230
 231                 // On old installations and never changed contacts this might not be filled
 232                 if (empty($contact['avatar'])) {
 233                         $contact['avatar'] = $contact['photo'];
 234                 }
 235
 236                 $data = ['@context' => ActivityPub::CONTEXT];
 237                 $data['id'] = $contact['url'];
 238                 $data['diaspora:guid'] = $user['guid'];
 239                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 240                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 241                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 242                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 243                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 244                 $data['preferredUsername'] = $user['nickname'];
 245                 $data['name'] = $contact['name'];
 246                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 247                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 248                 $data['summary'] = $contact['about'];
 249                 $data['url'] = $contact['url'];
 250                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 251                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 252                         'owner' => $contact['url'],
 253                         'publicKeyPem' => $user['pubkey']];
 254                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 255                 $data['icon'] = ['type' => 'Image',
 256                         'url' => $contact['avatar']];
 257
 258                 $data['generator'] = self::getService();
 259
 260                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 261                 return $data;
 262         }
 263
 264         /**
 265          * @param string $username
 266          * @return array
 267          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 268          */
 269         public static function getDeletedUser($username)
 270         {
 271                 return [
 272                         '@context' => ActivityPub::CONTEXT,
 273                         'id' => System::baseUrl() . '/profile/' . $username,
 274                         'type' => 'Tombstone',
 275                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 276                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 277                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 278                 ];
 279         }
 280
 281         /**
 282          * Returns an array with permissions of a given item array
 283          *
 284          * @param array $item
 285          *
 286          * @return array with permissions
 287          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 288          * @throws \ImagickException
 289          */
 290         private static function fetchPermissionBlockFromConversation($item)
 291         {
 292                 if (empty($item['thr-parent'])) {
 293                         return [];
 294                 }
 295
 296                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 297                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 298                 if (!DBA::isResult($conversation)) {
 299                         return [];
 300                 }
 301
 302                 $activity = json_decode($conversation['source'], true);
 303
 304                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 305                 $profile = APContact::getByURL($actor);
 306
 307                 $item_profile = APContact::getByURL($item['author-link']);
 308                 $exclude[] = $item['author-link'];
 309
 310                 if ($item['gravity'] == GRAVITY_PARENT) {
 311                         $exclude[] = $item['owner-link'];
 312                 }
 313
 314                 $permissions['to'][] = $actor;
 315
 316                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 317                         if (empty($activity[$element])) {
 318                                 continue;
 319                         }
 320                         if (is_string($activity[$element])) {
 321                                 $activity[$element] = [$activity[$element]];
 322                         }
 323
 324                         foreach ($activity[$element] as $receiver) {
 325                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 326                                         $permissions[$element][] = $item_profile['followers'];
 327                                 } elseif (!in_array($receiver, $exclude)) {
 328                                         $permissions[$element][] = $receiver;
 329                                 }
 330                         }
 331                 }
 332                 return $permissions;
 333         }
 334
 335         /**
 336          * Creates an array of permissions from an item thread
 337          *
 338          * @param array   $item       Item array
 339          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 340          * @param integer $last_id    Last item id for adding receivers
 341          * @param boolean $forum_mode "true" means that we are sending content to a forum
 342          *
 343          * @return array with permission data
 344          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 345          * @throws \ImagickException
 346          */
 347         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 348         {
 349                 if ($last_id == 0) {
 350                         $last_id = $item['id'];
 351                 }
 352
 353                 $always_bcc = false;
 354
 355                 // Check if we should always deliver our stuff via BCC
 356                 if (!empty($item['uid'])) {
 357                         $profile = Profile::getByUID($item['uid']);
 358                         if (!empty($profile)) {
 359                                 $always_bcc = $profile['hide-friends'];
 360                         }
 361                 }
 362
 363                 if (Config::get('debug', 'total_ap_delivery')) {
 364                         // Will be activated in a later step
 365                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 366                 } else {
 367                         // For now only send to these contacts:
 368                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 369                 }
 370
 371                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 372
 373                 if ($item['gravity'] == GRAVITY_PARENT) {
 374                         $actor_profile = APContact::getByURL($item['owner-link']);
 375                 } else {
 376                         $actor_profile = APContact::getByURL($item['author-link']);
 377                 }
 378
 379                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 380
 381                 if (!$item['private']) {
 382                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 383
 384                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 385
 386                         foreach ($terms as $term) {
 387                                 $profile = APContact::getByURL($term['url'], false);
 388                                 if (!empty($profile)) {
 389                                         $data['to'][] = $profile['url'];
 390                                 }
 391                         }
 392                 } else {
 393                         $receiver_list = Item::enumeratePermissions($item);
 394
 395                         foreach ($terms as $term) {
 396                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 397                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 398                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 399                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 400                                                 $data['to'][] = $profile['url'];
 401                                         }
 402                                 }
 403                         }
 404
 405                         foreach ($receiver_list as $receiver) {
 406                                 $contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
 407                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 408                                         if ($contact['hidden'] || $always_bcc) {
 409                                                 $data['bcc'][] = $profile['url'];
 410                                         } else {
 411                                                 $data['cc'][] = $profile['url'];
 412                                         }
 413                                 }
 414                         }
 415                 }
 416
 417                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 418                 while ($parent = Item::fetch($parents)) {
 419                         if ($parent['gravity'] == GRAVITY_PARENT) {
 420                                 $profile = APContact::getByURL($parent['owner-link'], false);
 421                                 if (!empty($profile)) {
 422                                         if ($item['gravity'] != GRAVITY_PARENT) {
 423                                                 // Comments to forums are directed to the forum
 424                                                 // But comments to forums aren't directed to the followers collection
 425                                                 if ($profile['type'] == 'Group') {
 426                                                         $data['to'][] = $profile['url'];
 427                                                 } else {
 428                                                         $data['cc'][] = $profile['url'];
 429                                                         if (!$item['private']) {
 430                                                                 $data['cc'][] = $actor_profile['followers'];
 431                                                         }
 432                                                 }
 433                                         } else {
 434                                                 // Public thread parent post always are directed to the followes
 435                                                 if (!$item['private'] && !$forum_mode) {
 436                                                         $data['cc'][] = $actor_profile['followers'];
 437                                                 }
 438                                         }
 439                                 }
 440                         }
 441
 442                         // Don't include data from future posts
 443                         if ($parent['id'] >= $last_id) {
 444                                 continue;
 445                         }
 446
 447                         $profile = APContact::getByURL($parent['author-link'], false);
 448                         if (!empty($profile)) {
 449                                 if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 450                                         $data['to'][] = $profile['url'];
 451                                 } else {
 452                                         $data['cc'][] = $profile['url'];
 453                                 }
 454                         }
 455                 }
 456                 DBA::close($parents);
 457
 458                 $data['to'] = array_unique($data['to']);
 459                 $data['cc'] = array_unique($data['cc']);
 460                 $data['bcc'] = array_unique($data['bcc']);
 461
 462                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 463                         unset($data['to'][$key]);
 464                 }
 465
 466                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 467                         unset($data['cc'][$key]);
 468                 }
 469
 470                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 471                         unset($data['bcc'][$key]);
 472                 }
 473
 474                 foreach ($data['to'] as $to) {
 475                         if (($key = array_search($to, $data['cc'])) !== false) {
 476                                 unset($data['cc'][$key]);
 477                         }
 478
 479                         if (($key = array_search($to, $data['bcc'])) !== false) {
 480                                 unset($data['bcc'][$key]);
 481                         }
 482                 }
 483
 484                 foreach ($data['cc'] as $cc) {
 485                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 486                                 unset($data['bcc'][$key]);
 487                         }
 488                 }
 489
 490                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 491
 492                 if (!$blindcopy) {
 493                         unset($receivers['bcc']);
 494                 }
 495
 496                 return $receivers;
 497         }
 498
 499         /**
 500          * Check if an inbox is archived
 501          *
 502          * @param string $url Inbox url
 503          *
 504          * @return boolean "true" if inbox is archived
 505          */
 506         private static function archivedInbox($url)
 507         {
 508                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 509         }
 510
 511         /**
 512          * Fetches a list of inboxes of followers of a given user
 513          *
 514          * @param integer $uid      User ID
 515          * @param boolean $personal fetch personal inboxes
 516          *
 517          * @return array of follower inboxes
 518          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 519          * @throws \ImagickException
 520          */
 521         public static function fetchTargetInboxesforUser($uid, $personal = false)
 522         {
 523                 $inboxes = [];
 524
 525                 if (Config::get('debug', 'total_ap_delivery')) {
 526                         // Will be activated in a later step
 527                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 528                 } else {
 529                         // For now only send to these contacts:
 530                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 531                 }
 532
 533                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 534
 535                 if (!empty($uid)) {
 536                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 537                 }
 538
 539                 $contacts = DBA::select('contact', ['url'], $condition);
 540                 while ($contact = DBA::fetch($contacts)) {
 541                         if (Network::isUrlBlocked($contact['url'])) {
 542                                 continue;
 543                         }
 544
 545                         $profile = APContact::getByURL($contact['url'], false);
 546                         if (!empty($profile)) {
 547                                 if (empty($profile['sharedinbox']) || $personal) {
 548                                         $target = $profile['inbox'];
 549                                 } else {
 550                                         $target = $profile['sharedinbox'];
 551                                 }
 552                                 if (!self::archivedInbox($target)) {
 553                                         $inboxes[$target] = $target;
 554                                 }
 555                         }
 556                 }
 557                 DBA::close($contacts);
 558
 559                 return $inboxes;
 560         }
 561
 562         /**
 563          * Fetches an array of inboxes for the given item and user
 564          *
 565          * @param array   $item       Item array
 566          * @param integer $uid        User ID
 567          * @param boolean $personal   fetch personal inboxes
 568          * @param integer $last_id    Last item id for adding receivers
 569          * @param boolean $forum_mode "true" means that we are sending content to a forum
 570          * @return array with inboxes
 571          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 572          * @throws \ImagickException
 573          */
 574         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 575         {
 576                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 577                 if (empty($permissions)) {
 578                         return [];
 579                 }
 580
 581                 $inboxes = [];
 582
 583                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 584                         $item_profile = APContact::getByURL($item['author-link'], false);
 585                 } else {
 586                         $item_profile = APContact::getByURL($item['owner-link'], false);
 587                 }
 588
 589                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 590                         if (empty($permissions[$element])) {
 591                                 continue;
 592                         }
 593
 594                         $blindcopy = in_array($element, ['bto', 'bcc']);
 595
 596                         foreach ($permissions[$element] as $receiver) {
 597                                 if (Network::isUrlBlocked($receiver)) {
 598                                         continue;
 599                                 }
 600
 601                                 if ($receiver == $item_profile['followers']) {
 602                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 603                                 } else {
 604                                         $profile = APContact::getByURL($receiver, false);
 605                                         if (!empty($profile)) {
 606                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 607                                                         $target = $profile['inbox'];
 608                                                 } else {
 609                                                         $target = $profile['sharedinbox'];
 610                                                 }
 611                                                 if (!self::archivedInbox($target)) {
 612                                                         $inboxes[$target] = $target;
 613                                                 }
 614                                         }
 615                                 }
 616                         }
 617                 }
 618
 619                 return $inboxes;
 620         }
 621
 622         /**
 623          * Returns the activity type of a given item
 624          *
 625          * @param array $item
 626          *
 627          * @return string with activity type
 628          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 629          * @throws \ImagickException
 630          */
 631         private static function getTypeOfItem($item)
 632         {
 633                 $reshared = false;
 634
 635                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 636                 if (strpos($item['body'], "[share") === 0) {
 637                         $announce = api_share_as_retweet($item);
 638                         $reshared = !empty($announce['plink']);
 639                 }
 640
 641                 if ($reshared) {
 642                         $type = 'Announce';
 643                 } elseif ($item['verb'] == ACTIVITY_POST) {
 644                         if ($item['created'] == $item['edited']) {
 645                                 $type = 'Create';
 646                         } else {
 647                                 $type = 'Update';
 648                         }
 649                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 650                         $type = 'Like';
 651                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 652                         $type = 'Dislike';
 653                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 654                         $type = 'Accept';
 655                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 656                         $type = 'Reject';
 657                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 658                         $type = 'TentativeAccept';
 659                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 660                         $type = 'Follow';
 661                 } else {
 662                         $type = '';
 663                 }
 664
 665                 return $type;
 666         }
 667
 668         /**
 669          * Creates the activity or fetches it from the cache
 670          *
 671          * @param integer $item_id
 672          * @param boolean $force Force new cache entry
 673          *
 674          * @return array with the activity
 675          * @throws \Exception
 676          */
 677         public static function createCachedActivityFromItem($item_id, $force = false)
 678         {
 679                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 680
 681                 if (!$force) {
 682                         $data = Cache::get($cachekey);
 683                         if (!is_null($data)) {
 684                                 return $data;
 685                         }
 686                 }
 687
 688                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 689
 690                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 691                 return $data;
 692         }
 693
 694         /**
 695          * Creates an activity array for a given item id
 696          *
 697          * @param integer $item_id
 698          * @param boolean $object_mode Is the activity item is used inside another object?
 699          *
 700          * @return array of activity
 701          * @throws \Exception
 702          */
 703         public static function createActivityFromItem($item_id, $object_mode = false)
 704         {
 705                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 706
 707                 if (!DBA::isResult($item)) {
 708                         return false;
 709                 }
 710
 711                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 712                         $owner = User::getOwnerDataById($item['uid']);
 713                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 714                                 $type = 'Announce';
 715
 716                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 717                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 718                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 719                         }
 720                 }
 721
 722                 if (empty($type)) {
 723                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 724                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 725                         if (DBA::isResult($conversation)) {
 726                                 $data = json_decode($conversation['source'], true);
 727                                 if (!empty($data)) {
 728                                         return $data;
 729                                 }
 730                         }
 731
 732                         $type = self::getTypeOfItem($item);
 733                 }
 734
 735                 if (!$object_mode) {
 736                         $data = ['@context' => ActivityPub::CONTEXT];
 737
 738                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 739                                 $type = 'Undo';
 740                         } elseif ($item['deleted']) {
 741                                 $type = 'Delete';
 742                         }
 743                 } else {
 744                         $data = [];
 745                 }
 746
 747                 $data['id'] = $item['uri'] . '#' . $type;
 748                 $data['type'] = $type;
 749
 750                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 751                         $data['actor'] = $item['author-link'];
 752                 } else {
 753                         $data['actor'] = $item['owner-link'];
 754                 }
 755
 756                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 757
 758                 $data['instrument'] = self::getService();
 759
 760                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 761
 762                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 763                         $data['object'] = self::createNote($item);
 764                 } elseif ($data['type'] == 'Announce') {
 765                         $data = self::createAnnounce($item, $data);
 766                 } elseif ($data['type'] == 'Follow') {
 767                         $data['object'] = $item['parent-uri'];
 768                 } elseif ($data['type'] == 'Undo') {
 769                         $data['object'] = self::createActivityFromItem($item_id, true);
 770                 } else {
 771                         $data['diaspora:guid'] = $item['guid'];
 772                         if (!empty($item['signed_text'])) {
 773                                 $data['diaspora:like'] = $item['signed_text'];
 774                         }
 775                         $data['object'] = $item['thr-parent'];
 776                 }
 777
 778                 if (!empty($item['contact-uid'])) {
 779                         $uid = $item['contact-uid'];
 780                 } else {
 781                         $uid = $item['uid'];
 782                 }
 783
 784                 $owner = User::getOwnerDataById($uid);
 785
 786                 if (!$object_mode && !empty($owner)) {
 787                         return LDSignature::sign($data, $owner);
 788                 } else {
 789                         return $data;
 790                 }
 791
 792                 /// @todo Create "conversation" entry
 793         }
 794
 795         /**
 796          * Creates an object array for a given item id
 797          *
 798          * @param integer $item_id
 799          *
 800          * @return array with the object data
 801          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 802          * @throws \ImagickException
 803          */
 804         public static function createObjectFromItemID($item_id)
 805         {
 806                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 807
 808                 if (!DBA::isResult($item)) {
 809                         return false;
 810                 }
 811
 812                 $data = ['@context' => ActivityPub::CONTEXT];
 813                 $data = array_merge($data, self::createNote($item));
 814
 815                 return $data;
 816         }
 817
 818         /**
 819          * Creates a location entry for a given item array
 820          *
 821          * @param array $item
 822          *
 823          * @return array with location array
 824          */
 825         private static function createLocation($item)
 826         {
 827                 $location = ['type' => 'Place'];
 828
 829                 if (!empty($item['location'])) {
 830                         $location['name'] = $item['location'];
 831                 }
 832
 833                 $coord = [];
 834
 835                 if (empty($item['coord'])) {
 836                         $coord = Map::getCoordinates($item['location']);
 837                 } else {
 838                         $coords = explode(' ', $item['coord']);
 839                         if (count($coords) == 2) {
 840                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 841                         }
 842                 }
 843
 844                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 845                         $location['latitude'] = $coord['lat'];
 846                         $location['longitude'] = $coord['lon'];
 847                 }
 848
 849                 return $location;
 850         }
 851
 852         /**
 853          * Returns a tag array for a given item array
 854          *
 855          * @param array $item
 856          *
 857          * @return array of tags
 858          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 859          */
 860         private static function createTagList($item)
 861         {
 862                 $tags = [];
 863
 864                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 865                 foreach ($terms as $term) {
 866                         if ($term['type'] == Term::HASHTAG) {
 867                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 868                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 869                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 870                                 $contact = Contact::getDetailsByURL($term['url']);
 871                                 if (!empty($contact['addr'])) {
 872                                         $mention = '@' . $contact['addr'];
 873                                 } else {
 874                                         $mention = '@' . $term['url'];
 875                                 }
 876
 877                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 878                         }
 879                 }
 880                 return $tags;
 881         }
 882
 883         /**
 884          * Adds attachment data to the JSON document
 885          *
 886          * @param array  $item Data of the item that is to be posted
 887          * @param string $type Object type
 888          *
 889          * @return array with attachment data
 890          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 891          */
 892         private static function createAttachmentList($item, $type)
 893         {
 894                 $attachments = [];
 895
 896                 $arr = explode('[/attach],', $item['attach']);
 897                 if (count($arr)) {
 898                         foreach ($arr as $r) {
 899                                 $matches = false;
 900                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 901                                 if ($cnt) {
 902                                         $attributes = ['type' => 'Document',
 903                                                         'mediaType' => $matches[3],
 904                                                         'url' => $matches[1],
 905                                                         'name' => null];
 906
 907                                         if (trim($matches[4]) != '') {
 908                                                 $attributes['name'] = trim($matches[4]);
 909                                         }
 910
 911                                         $attachments[] = $attributes;
 912                                 }
 913                         }
 914                 }
 915
 916                 if ($type != 'Note') {
 917                         return $attachments;
 918                 }
 919
 920                 // Simplify image codes
 921                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 922
 923                 // Grab all pictures and create attachments out of them
 924                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 925                         foreach ($pictures[1] as $picture) {
 926                                 $imgdata = Image::getInfoFromURL($picture);
 927                                 if ($imgdata) {
 928                                         $attachments[] = ['type' => 'Document',
 929                                                 'mediaType' => $imgdata['mime'],
 930                                                 'url' => $picture,
 931                                                 'name' => null];
 932                                 }
 933                         }
 934                 }
 935
 936                 return $attachments;
 937         }
 938
 939         /**
 940          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 941          *
 942          * @param array $match Matching values for the callback
 943          * @return string Replaced mention
 944          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 945          */
 946         private static function mentionCallback($match)
 947         {
 948                 if (empty($match[1])) {
 949                         return '';
 950                 }
 951
 952                 $data = Contact::getDetailsByURL($match[1]);
 953                 if (empty($data['nick'])) {
 954                         return $match[0];
 955                 }
 956
 957                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 958         }
 959
 960         /**
 961          * Remove image elements and replaces them with links to the image
 962          *
 963          * @param string $body
 964          *
 965          * @return string with replaced elements
 966          */
 967         private static function removePictures($body)
 968         {
 969                 // Simplify image codes
 970                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 971
 972                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 973                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 974
 975                 return $body;
 976         }
 977
 978         /**
 979          * Fetches the "context" value for a givem item array from the "conversation" table
 980          *
 981          * @param array $item
 982          *
 983          * @return string with context url
 984          * @throws \Exception
 985          */
 986         private static function fetchContextURLForItem($item)
 987         {
 988                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 989                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 990                         $context_uri = $conversation['conversation-href'];
 991                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 992                         $context_uri = $conversation['conversation-uri'];
 993                 } else {
 994                         $context_uri = $item['parent-uri'] . '#context';
 995                 }
 996                 return $context_uri;
 997         }
 998
 999         /**
1000          * Returns if the post contains sensitive content ("nsfw")
1001          *
1002          * @param integer $item_id
1003          *
1004          * @return boolean
1005          * @throws \Exception
1006          */
1007         private static function isSensitive($item_id)
1008         {
1009                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
1010                 return DBA::exists('term', $condition);
1011         }
1012
1013         /**
1014          * Creates event data
1015          *
1016          * @param array $item
1017          *
1018          * @return array with the event data
1019          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1020          */
1021         public static function createEvent($item)
1022         {
1023                 $event = [];
1024                 $event['name'] = $item['event-summary'];
1025                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
1026                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1027
1028                 if (!$item['event-nofinish']) {
1029                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1030                 }
1031
1032                 if (!empty($item['event-location'])) {
1033                         $item['location'] = $item['event-location'];
1034                         $event['location'] = self::createLocation($item);
1035                 }
1036
1037                 return $event;
1038         }
1039
1040         /**
1041          * Creates a note/article object array
1042          *
1043          * @param array $item
1044          *
1045          * @return array with the object data
1046          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1047          * @throws \ImagickException
1048          */
1049         public static function createNote($item)
1050         {
1051                 if ($item['event-type'] == 'event') {
1052                         $type = 'Event';
1053                 } elseif (!empty($item['title'])) {
1054                         $type = 'Article';
1055                 } else {
1056                         $type = 'Note';
1057                 }
1058
1059                 if ($item['deleted']) {
1060                         $type = 'Tombstone';
1061                 }
1062
1063                 $data = [];
1064                 $data['id'] = $item['uri'];
1065                 $data['type'] = $type;
1066
1067                 if ($item['deleted']) {
1068                         return $data;
1069                 }
1070
1071                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1072
1073                 if ($item['uri'] != $item['thr-parent']) {
1074                         $data['inReplyTo'] = $item['thr-parent'];
1075                 } else {
1076                         $data['inReplyTo'] = null;
1077                 }
1078
1079                 $data['diaspora:guid'] = $item['guid'];
1080                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1081
1082                 if ($item['created'] != $item['edited']) {
1083                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1084                 }
1085
1086                 $data['url'] = $item['plink'];
1087                 $data['attributedTo'] = $item['author-link'];
1088                 $data['sensitive'] = self::isSensitive($item['id']);
1089                 $data['context'] = self::fetchContextURLForItem($item);
1090
1091                 if (!empty($item['title'])) {
1092                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1093                 }
1094
1095                 $permission_block = self::createPermissionBlockForItem($item, false);
1096
1097                 $body = $item['body'];
1098
1099                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1100                         $body = self::prependMentions($body, $permission_block);
1101                 }
1102
1103                 if ($type == 'Note') {
1104                         $body = self::removePictures($body);
1105                 } elseif (($type == 'Article') && empty($data['summary'])) {
1106                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1107                 }
1108
1109                 if ($type == 'Event') {
1110                         $data = array_merge($data, self::createEvent($item));
1111                 } else {
1112                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1113                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1114
1115                         $data['content'] = BBCode::convert($body, false, 7);
1116                 }
1117
1118                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1119
1120                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1121                         $data['diaspora:comment'] = $item['signed_text'];
1122                 }
1123
1124                 $data['attachment'] = self::createAttachmentList($item, $type);
1125                 $data['tag'] = self::createTagList($item);
1126
1127                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1128                         $data['location'] = self::createLocation($item);
1129                 }
1130
1131                 if (!empty($item['app'])) {
1132                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1133                 }
1134
1135                 $data = array_merge($data, $permission_block);
1136
1137                 return $data;
1138         }
1139
1140         /**
1141          * Creates an announce object entry
1142          *
1143          * @param array $item
1144          * @param array $data activity data
1145          *
1146          * @return array with activity data
1147          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1148          * @throws \ImagickException
1149          */
1150         private static function createAnnounce($item, $data)
1151         {
1152                 $announce = api_share_as_retweet($item);
1153                 if (empty($announce['plink'])) {
1154                         $data['type'] = 'Create';
1155                         $data['object'] = self::createNote($item);
1156                         return $data;
1157                 }
1158
1159                 // Fetch the original id of the object
1160                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1161                 if (!empty($activity)) {
1162                         $ldactivity = JsonLD::compact($activity);
1163                         $id = JsonLD::fetchElement($ldactivity, '@id');
1164                         if (!empty($id)) {
1165                                 $data['object'] = $id;
1166                                 return $data;
1167                         }
1168                 }
1169
1170                 $data['type'] = 'Create';
1171                 $data['object'] = self::createNote($item);
1172                 return $data;
1173         }
1174
1175         /**
1176          * Creates an activity id for a given contact id
1177          *
1178          * @param integer $cid Contact ID of target
1179          *
1180          * @return bool|string activity id
1181          */
1182         public static function activityIDFromContact($cid)
1183         {
1184                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1185                 if (!DBA::isResult($contact)) {
1186                         return false;
1187                 }
1188
1189                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1190                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1191                 return System::baseUrl() . '/activity/' . $uuid;
1192         }
1193
1194         /**
1195          * Transmits a contact suggestion to a given inbox
1196          *
1197          * @param integer $uid           User ID
1198          * @param string  $inbox         Target inbox
1199          * @param integer $suggestion_id Suggestion ID
1200          *
1201          * @return boolean was the transmission successful?
1202          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1203          */
1204         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1205         {
1206                 $owner = User::getOwnerDataById($uid);
1207
1208                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1209
1210                 $data = ['@context' => ActivityPub::CONTEXT,
1211                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1212                         'type' => 'Announce',
1213                         'actor' => $owner['url'],
1214                         'object' => $suggestion['url'],
1215                         'content' => $suggestion['note'],
1216                         'instrument' => self::getService(),
1217                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1218                         'cc' => []];
1219
1220                 $signed = LDSignature::sign($data, $owner);
1221
1222                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1223                 return HTTPSignature::transmit($signed, $inbox, $uid);
1224         }
1225
1226         /**
1227          * Transmits a profile relocation to a given inbox
1228          *
1229          * @param integer $uid   User ID
1230          * @param string  $inbox Target inbox
1231          *
1232          * @return boolean was the transmission successful?
1233          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1234          */
1235         public static function sendProfileRelocation($uid, $inbox)
1236         {
1237                 $owner = User::getOwnerDataById($uid);
1238
1239                 $data = ['@context' => ActivityPub::CONTEXT,
1240                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1241                         'type' => 'dfrn:relocate',
1242                         'actor' => $owner['url'],
1243                         'object' => $owner['url'],
1244                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1245                         'instrument' => self::getService(),
1246                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1247                         'cc' => []];
1248
1249                 $signed = LDSignature::sign($data, $owner);
1250
1251                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1252                 return HTTPSignature::transmit($signed, $inbox, $uid);
1253         }
1254
1255         /**
1256          * Transmits a profile deletion to a given inbox
1257          *
1258          * @param integer $uid   User ID
1259          * @param string  $inbox Target inbox
1260          *
1261          * @return boolean was the transmission successful?
1262          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1263          */
1264         public static function sendProfileDeletion($uid, $inbox)
1265         {
1266                 $owner = User::getOwnerDataById($uid);
1267
1268                 if (empty($owner)) {
1269                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1270                         return false;
1271                 }
1272
1273                 if (empty($owner['uprvkey'])) {
1274                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1275                         return false;
1276                 }
1277
1278                 $data = ['@context' => ActivityPub::CONTEXT,
1279                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1280                         'type' => 'Delete',
1281                         'actor' => $owner['url'],
1282                         'object' => $owner['url'],
1283                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1284                         'instrument' => self::getService(),
1285                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1286                         'cc' => []];
1287
1288                 $signed = LDSignature::sign($data, $owner);
1289
1290                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1291                 return HTTPSignature::transmit($signed, $inbox, $uid);
1292         }
1293
1294         /**
1295          * Transmits a profile change to a given inbox
1296          *
1297          * @param integer $uid   User ID
1298          * @param string  $inbox Target inbox
1299          *
1300          * @return boolean was the transmission successful?
1301          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1302          * @throws \ImagickException
1303          */
1304         public static function sendProfileUpdate($uid, $inbox)
1305         {
1306                 $owner = User::getOwnerDataById($uid);
1307                 $profile = APContact::getByURL($owner['url']);
1308
1309                 $data = ['@context' => ActivityPub::CONTEXT,
1310                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1311                         'type' => 'Update',
1312                         'actor' => $owner['url'],
1313                         'object' => self::getProfile($uid),
1314                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1315                         'instrument' => self::getService(),
1316                         'to' => [$profile['followers']],
1317                         'cc' => []];
1318
1319                 $signed = LDSignature::sign($data, $owner);
1320
1321                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1322                 return HTTPSignature::transmit($signed, $inbox, $uid);
1323         }
1324
1325         /**
1326          * Transmits a given activity to a target
1327          *
1328          * @param string  $activity Type name
1329          * @param string  $target   Target profile
1330          * @param integer $uid      User ID
1331          * @return bool
1332          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1333          * @throws \ImagickException
1334          * @throws \Exception
1335          */
1336         public static function sendActivity($activity, $target, $uid, $id = '')
1337         {
1338                 $profile = APContact::getByURL($target);
1339
1340                 $owner = User::getOwnerDataById($uid);
1341
1342                 if (empty($id)) {
1343                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1344                 }
1345
1346                 $data = ['@context' => ActivityPub::CONTEXT,
1347                         'id' => $id,
1348                         'type' => $activity,
1349                         'actor' => $owner['url'],
1350                         'object' => $profile['url'],
1351                         'instrument' => self::getService(),
1352                         'to' => [$profile['url']]];
1353
1354                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1355
1356                 $signed = LDSignature::sign($data, $owner);
1357                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1358         }
1359
1360         /**
1361          * Transmits a "follow object" activity to a target
1362          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1363          *
1364          * @param string  $object Object URL
1365          * @param string  $target Target profile
1366          * @param integer $uid    User ID
1367          * @return bool
1368          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1369          * @throws \ImagickException
1370          * @throws \Exception
1371          */
1372         public static function sendFollowObject($object, $target, $uid = 0)
1373         {
1374                 $profile = APContact::getByURL($target);
1375
1376                 if (empty($uid)) {
1377                         // Fetch the list of administrators
1378                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1379
1380                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1381                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1382                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1383                         $uid = $first_user['uid'];
1384                 }
1385
1386                 $condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1387                         'author-id' => Contact::getPublicIdByUserId($uid)];
1388                 if (Item::exists($condition)) {
1389                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1390                         return false;
1391                 }
1392
1393                 $owner = User::getOwnerDataById($uid);
1394
1395                 $data = ['@context' => ActivityPub::CONTEXT,
1396                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1397                         'type' => 'Follow',
1398                         'actor' => $owner['url'],
1399                         'object' => $object,
1400                         'instrument' => self::getService(),
1401                         'to' => [$profile['url']]];
1402
1403                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1404
1405                 $signed = LDSignature::sign($data, $owner);
1406                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1407         }
1408
1409         /**
1410          * Transmit a message that the contact request had been accepted
1411          *
1412          * @param string  $target Target profile
1413          * @param         $id
1414          * @param integer $uid    User ID
1415          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1416          * @throws \ImagickException
1417          */
1418         public static function sendContactAccept($target, $id, $uid)
1419         {
1420                 $profile = APContact::getByURL($target);
1421
1422                 $owner = User::getOwnerDataById($uid);
1423                 $data = ['@context' => ActivityPub::CONTEXT,
1424                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1425                         'type' => 'Accept',
1426                         'actor' => $owner['url'],
1427                         'object' => ['id' => $id, 'type' => 'Follow',
1428                                 'actor' => $profile['url'],
1429                                 'object' => $owner['url']],
1430                         'instrument' => self::getService(),
1431                         'to' => [$profile['url']]];
1432
1433                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1434
1435                 $signed = LDSignature::sign($data, $owner);
1436                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1437         }
1438
1439         /**
1440          * Reject a contact request or terminates the contact relation
1441          *
1442          * @param string  $target Target profile
1443          * @param         $id
1444          * @param integer $uid    User ID
1445          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1446          * @throws \ImagickException
1447          */
1448         public static function sendContactReject($target, $id, $uid)
1449         {
1450                 $profile = APContact::getByURL($target);
1451
1452                 $owner = User::getOwnerDataById($uid);
1453                 $data = ['@context' => ActivityPub::CONTEXT,
1454                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1455                         'type' => 'Reject',
1456                         'actor' => $owner['url'],
1457                         'object' => ['id' => $id, 'type' => 'Follow',
1458                                 'actor' => $profile['url'],
1459                                 'object' => $owner['url']],
1460                         'instrument' => self::getService(),
1461                         'to' => [$profile['url']]];
1462
1463                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1464
1465                 $signed = LDSignature::sign($data, $owner);
1466                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1467         }
1468
1469         /**
1470          * Transmits a message that we don't want to follow this contact anymore
1471          *
1472          * @param string  $target Target profile
1473          * @param integer $uid    User ID
1474          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1475          * @throws \ImagickException
1476          * @throws \Exception
1477          */
1478         public static function sendContactUndo($target, $cid, $uid)
1479         {
1480                 $profile = APContact::getByURL($target);
1481
1482                 $object_id = self::activityIDFromContact($cid);
1483                 if (empty($object_id)) {
1484                         return;
1485                 }
1486
1487                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1488
1489                 $owner = User::getOwnerDataById($uid);
1490                 $data = ['@context' => ActivityPub::CONTEXT,
1491                         'id' => $id,
1492                         'type' => 'Undo',
1493                         'actor' => $owner['url'],
1494                         'object' => ['id' => $object_id, 'type' => 'Follow',
1495                                 'actor' => $owner['url'],
1496                                 'object' => $profile['url']],
1497                         'instrument' => self::getService(),
1498                         'to' => [$profile['url']]];
1499
1500                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1501
1502                 $signed = LDSignature::sign($data, $owner);
1503                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1504         }
1505
1506         private static function prependMentions($body, array $permission_block)
1507         {
1508                 if (Config::get('system', 'disable_implicit_mentions')) {
1509                         return $body;
1510                 }
1511
1512                 $mentions = [];
1513
1514                 foreach ($permission_block['to'] as $profile_url) {
1515                         $profile = Contact::getDetailsByURL($profile_url);
1516                         if (!empty($profile['addr'])
1517                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1518                                 && !strstr($body, $profile['addr'])
1519                                 && !strstr($body, $profile_url)
1520                         ) {
1521                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1522                         }
1523                 }
1524
1525                 $mentions[] = $body;
1526
1527                 return implode(' ', $mentions);
1528         }
1529 }