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