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