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