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\Config;
  10 use Friendica\Core\Logger;
  11 use Friendica\Core\System;
  12 use Friendica\Util\HTTPSignature;
  13 use Friendica\Core\Protocol;
  14 use Friendica\Model\Conversation;
  15 use Friendica\Model\Contact;
  16 use Friendica\Model\APContact;
  17 use Friendica\Model\Item;
  18 use Friendica\Model\Term;
  19 use Friendica\Model\User;
  20 use Friendica\Util\DateTimeFormat;
  21 use Friendica\Content\Text\BBCode;
  22 use Friendica\Util\JsonLD;
  23 use Friendica\Util\LDSignature;
  24 use Friendica\Model\Profile;
  25 use Friendica\Object\Image;
  26 use Friendica\Protocol\ActivityPub;
  27 use Friendica\Core\Cache;
  28 use Friendica\Util\Map;
  29 use Friendica\Util\Network;
  30
  31 require_once 'include/api.php';
  32 require_once 'mod/share.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'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_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                 if (Config::get('debug', 'total_ap_delivery')) {
 330                         // Will be activated in a later step
 331                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 332                 } else {
 333                         // For now only send to these contacts:
 334                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 335                 }
 336
 337                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 338
 339                 if ($item['gravity'] == GRAVITY_PARENT) {
 340                         $actor_profile = APContact::getByURL($item['owner-link']);
 341                 } else {
 342                         $actor_profile = APContact::getByURL($item['author-link']);
 343                 }
 344
 345                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 346
 347                 if (!$item['private']) {
 348                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 349
 350                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 351
 352                         foreach ($terms as $term) {
 353                                 $profile = APContact::getByURL($term['url'], false);
 354                                 if (!empty($profile)) {
 355                                         $data['to'][] = $profile['url'];
 356                                 }
 357                         }
 358                 } else {
 359                         $receiver_list = Item::enumeratePermissions($item);
 360
 361                         foreach ($terms as $term) {
 362                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 363                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 364                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 365                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 366                                                 $data['to'][] = $profile['url'];
 367                                         }
 368                                 }
 369                         }
 370
 371                         foreach ($receiver_list as $receiver) {
 372                                 $contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
 373                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 374                                         if ($contact['hidden'] || $always_bcc) {
 375                                                 $data['bcc'][] = $profile['url'];
 376                                         } else {
 377                                                 $data['cc'][] = $profile['url'];
 378                                         }
 379                                 }
 380                         }
 381                 }
 382
 383                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 384                 while ($parent = Item::fetch($parents)) {
 385                         if ($parent['gravity'] == GRAVITY_PARENT) {
 386                                 $profile = APContact::getByURL($parent['owner-link'], false);
 387                                 if (!empty($profile)) {
 388                                         if ($item['gravity'] != GRAVITY_PARENT) {
 389                                                 // Comments to forums are directed to the forum
 390                                                 // But comments to forums aren't directed to the followers collection
 391                                                 if ($profile['type'] == 'Group') {
 392                                                         $data['to'][] = $profile['url'];
 393                                                 } else {
 394                                                         $data['cc'][] = $profile['url'];
 395                                                         if (!$item['private']) {
 396                                                                 $data['cc'][] = $actor_profile['followers'];
 397                                                         }
 398                                                 }
 399                                         } else {
 400                                                 // Public thread parent post always are directed to the followes
 401                                                 if (!$item['private']) {
 402                                                         $data['cc'][] = $actor_profile['followers'];
 403                                                 }
 404                                         }
 405                                 }
 406                         }
 407
 408                         // Don't include data from future posts
 409                         if ($parent['id'] >= $last_id) {
 410                                 continue;
 411                         }
 412
 413                         $profile = APContact::getByURL($parent['author-link'], false);
 414                         if (!empty($profile)) {
 415                                 if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 416                                         $data['to'][] = $profile['url'];
 417                                 } else {
 418                                         $data['cc'][] = $profile['url'];
 419                                 }
 420                         }
 421                 }
 422                 DBA::close($parents);
 423
 424                 $data['to'] = array_unique($data['to']);
 425                 $data['cc'] = array_unique($data['cc']);
 426                 $data['bcc'] = array_unique($data['bcc']);
 427
 428                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 429                         unset($data['to'][$key]);
 430                 }
 431
 432                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 433                         unset($data['cc'][$key]);
 434                 }
 435
 436                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 437                         unset($data['bcc'][$key]);
 438                 }
 439
 440                 foreach ($data['to'] as $to) {
 441                         if (($key = array_search($to, $data['cc'])) !== false) {
 442                                 unset($data['cc'][$key]);
 443                         }
 444
 445                         if (($key = array_search($to, $data['bcc'])) !== false) {
 446                                 unset($data['bcc'][$key]);
 447                         }
 448                 }
 449
 450                 foreach ($data['cc'] as $cc) {
 451                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 452                                 unset($data['bcc'][$key]);
 453                         }
 454                 }
 455
 456                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 457
 458                 if (!$blindcopy) {
 459                         unset($receivers['bcc']);
 460                 }
 461
 462                 return $receivers;
 463         }
 464
 465         /**
 466          * Fetches a list of inboxes of followers of a given user
 467          *
 468          * @param integer $uid      User ID
 469          * @param boolean $personal fetch personal inboxes
 470          *
 471          * @return array of follower inboxes
 472          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 473          * @throws \ImagickException
 474          */
 475         public static function fetchTargetInboxesforUser($uid, $personal = false)
 476         {
 477                 $inboxes = [];
 478
 479                 if (Config::get('debug', 'total_ap_delivery')) {
 480                         // Will be activated in a later step
 481                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 482                 } else {
 483                         // For now only send to these contacts:
 484                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 485                 }
 486
 487                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 488
 489                 if (!empty($uid)) {
 490                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 491                 }
 492
 493                 $contacts = DBA::select('contact', ['url'], $condition);
 494                 while ($contact = DBA::fetch($contacts)) {
 495                         if (Network::isUrlBlocked($contact['url'])) {
 496                                 continue;
 497                         }
 498
 499                         $profile = APContact::getByURL($contact['url'], false);
 500                         if (!empty($profile)) {
 501                                 if (empty($profile['sharedinbox']) || $personal) {
 502                                         $target = $profile['inbox'];
 503                                 } else {
 504                                         $target = $profile['sharedinbox'];
 505                                 }
 506                                 $inboxes[$target] = $target;
 507                         }
 508                 }
 509                 DBA::close($contacts);
 510
 511                 return $inboxes;
 512         }
 513
 514         /**
 515          * Fetches an array of inboxes for the given item and user
 516          *
 517          * @param array   $item
 518          * @param integer $uid      User ID
 519          * @param boolean $personal fetch personal inboxes
 520          * @param integer $last_id Last item id for adding receivers
 521          *
 522          * @return array with inboxes
 523          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 524          * @throws \ImagickException
 525          */
 526         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0)
 527         {
 528                 $permissions = self::createPermissionBlockForItem($item, true, $last_id);
 529                 if (empty($permissions)) {
 530                         return [];
 531                 }
 532
 533                 $inboxes = [];
 534
 535                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 536                         $item_profile = APContact::getByURL($item['author-link'], false);
 537                 } else {
 538                         $item_profile = APContact::getByURL($item['owner-link'], false);
 539                 }
 540
 541                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 542                         if (empty($permissions[$element])) {
 543                                 continue;
 544                         }
 545
 546                         $blindcopy = in_array($element, ['bto', 'bcc']);
 547
 548                         foreach ($permissions[$element] as $receiver) {
 549                                 if (Network::isUrlBlocked($receiver)) {
 550                                         continue;
 551                                 }
 552
 553                                 if ($receiver == $item_profile['followers']) {
 554                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 555                                 } else {
 556                                         $profile = APContact::getByURL($receiver, false);
 557                                         if (!empty($profile)) {
 558                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 559                                                         $target = $profile['inbox'];
 560                                                 } else {
 561                                                         $target = $profile['sharedinbox'];
 562                                                 }
 563                                                 $inboxes[$target] = $target;
 564                                         }
 565                                 }
 566                         }
 567                 }
 568
 569                 return $inboxes;
 570         }
 571
 572         /**
 573          * Returns the activity type of a given item
 574          *
 575          * @param array $item
 576          *
 577          * @return string with activity type
 578          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 579          * @throws \ImagickException
 580          */
 581         private static function getTypeOfItem($item)
 582         {
 583                 $reshared = false;
 584
 585                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 586                 if (strpos($item['body'], "[share") === 0) {
 587                         $announce = api_share_as_retweet($item);
 588                         $reshared = !empty($announce['plink']);
 589                 }
 590
 591                 if ($reshared) {
 592                         $type = 'Announce';
 593                 } elseif ($item['verb'] == ACTIVITY_POST) {
 594                         if ($item['created'] == $item['edited']) {
 595                                 $type = 'Create';
 596                         } else {
 597                                 $type = 'Update';
 598                         }
 599                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 600                         $type = 'Like';
 601                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 602                         $type = 'Dislike';
 603                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 604                         $type = 'Accept';
 605                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 606                         $type = 'Reject';
 607                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 608                         $type = 'TentativeAccept';
 609                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 610                         $type = 'Follow';
 611                 } else {
 612                         $type = '';
 613                 }
 614
 615                 return $type;
 616         }
 617
 618         /**
 619          * Creates the activity or fetches it from the cache
 620          *
 621          * @param integer $item_id
 622          * @param boolean $force Force new cache entry
 623          *
 624          * @return array with the activity
 625          * @throws \Exception
 626          */
 627         public static function createCachedActivityFromItem($item_id, $force = false)
 628         {
 629                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 630
 631                 if (!$force) {
 632                         $data = Cache::get($cachekey);
 633                         if (!is_null($data)) {
 634                                 return $data;
 635                         }
 636                 }
 637
 638                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 639
 640                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 641                 return $data;
 642         }
 643
 644         /**
 645          * Creates an activity array for a given item id
 646          *
 647          * @param integer $item_id
 648          * @param boolean $object_mode Is the activity item is used inside another object?
 649          *
 650          * @return array of activity
 651          * @throws \Exception
 652          */
 653         public static function createActivityFromItem($item_id, $object_mode = false)
 654         {
 655                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 656
 657                 if (!DBA::isResult($item)) {
 658                         return false;
 659                 }
 660
 661                 if ($item['wall']) {
 662                         $owner = User::getOwnerDataById($item['uid']);
 663                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 664                                 $type = 'Announce';
 665
 666                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 667                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 668                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 669                         }
 670                 }
 671
 672                 if (empty($type)) {
 673                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 674                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 675                         if (DBA::isResult($conversation)) {
 676                                 $data = json_decode($conversation['source']);
 677                                 if (!empty($data)) {
 678                                         return $data;
 679                                 }
 680                         }
 681
 682                         $type = self::getTypeOfItem($item);
 683                 }
 684
 685                 if (!$object_mode) {
 686                         $data = ['@context' => ActivityPub::CONTEXT];
 687
 688                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 689                                 $type = 'Undo';
 690                         } elseif ($item['deleted']) {
 691                                 $type = 'Delete';
 692                         }
 693                 } else {
 694                         $data = [];
 695                 }
 696
 697                 $data['id'] = $item['uri'] . '#' . $type;
 698                 $data['type'] = $type;
 699                 $data['actor'] = $item['owner-link'];
 700
 701                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 702
 703                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 704
 705                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 706
 707                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 708                         $data['object'] = self::createNote($item);
 709                 } elseif ($data['type'] == 'Announce') {
 710                         $data = self::createAnnounce($item, $data);
 711                 } elseif ($data['type'] == 'Follow') {
 712                         $data['object'] = $item['parent-uri'];
 713                 } elseif ($data['type'] == 'Undo') {
 714                         $data['object'] = self::createActivityFromItem($item_id, true);
 715                 } else {
 716                         $data['diaspora:guid'] = $item['guid'];
 717                         if (!empty($item['signed_text'])) {
 718                                 $data['diaspora:like'] = $item['signed_text'];
 719                         }
 720                         $data['object'] = $item['thr-parent'];
 721                 }
 722
 723                 if (!empty($item['contact-uid'])) {
 724                         $uid = $item['contact-uid'];
 725                 } else {
 726                         $uid = $item['uid'];
 727                 }
 728
 729                 $owner = User::getOwnerDataById($uid);
 730
 731                 if (!$object_mode && !empty($owner)) {
 732                         return LDSignature::sign($data, $owner);
 733                 } else {
 734                         return $data;
 735                 }
 736
 737                 /// @todo Create "conversation" entry
 738         }
 739
 740         /**
 741          * Creates an object array for a given item id
 742          *
 743          * @param integer $item_id
 744          *
 745          * @return array with the object data
 746          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 747          * @throws \ImagickException
 748          */
 749         public static function createObjectFromItemID($item_id)
 750         {
 751                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 752
 753                 if (!DBA::isResult($item)) {
 754                         return false;
 755                 }
 756
 757                 $data = ['@context' => ActivityPub::CONTEXT];
 758                 $data = array_merge($data, self::createNote($item));
 759
 760                 return $data;
 761         }
 762
 763         /**
 764          * Creates a location entry for a given item array
 765          *
 766          * @param array $item
 767          *
 768          * @return array with location array
 769          */
 770         private static function createLocation($item)
 771         {
 772                 $location = ['type' => 'Place'];
 773
 774                 if (!empty($item['location'])) {
 775                         $location['name'] = $item['location'];
 776                 }
 777
 778                 $coord = [];
 779
 780                 if (empty($item['coord'])) {
 781                         $coord = Map::getCoordinates($item['location']);
 782                 } else {
 783                         $coords = explode(' ', $item['coord']);
 784                         if (count($coords) == 2) {
 785                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 786                         }
 787                 }
 788
 789                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 790                         $location['latitude'] = $coord['lat'];
 791                         $location['longitude'] = $coord['lon'];
 792                 }
 793
 794                 return $location;
 795         }
 796
 797         /**
 798          * Returns a tag array for a given item array
 799          *
 800          * @param array $item
 801          *
 802          * @return array of tags
 803          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 804          */
 805         private static function createTagList($item)
 806         {
 807                 $tags = [];
 808
 809                 $terms = Term::tagArrayFromItemId($item['id']);
 810                 foreach ($terms as $term) {
 811                         if ($term['type'] == TERM_HASHTAG) {
 812                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 813                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 814                         } elseif ($term['type'] == TERM_MENTION) {
 815                                 $contact = Contact::getDetailsByURL($term['url']);
 816                                 if (!empty($contact['addr'])) {
 817                                         $mention = '@' . $contact['addr'];
 818                                 } else {
 819                                         $mention = '@' . $term['url'];
 820                                 }
 821
 822                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 823                         }
 824                 }
 825                 return $tags;
 826         }
 827
 828         /**
 829          * Adds attachment data to the JSON document
 830          *
 831          * @param array  $item Data of the item that is to be posted
 832          * @param string $type Object type
 833          *
 834          * @return array with attachment data
 835          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 836          */
 837         private static function createAttachmentList($item, $type)
 838         {
 839                 $attachments = [];
 840
 841                 $arr = explode('[/attach],', $item['attach']);
 842                 if (count($arr)) {
 843                         foreach ($arr as $r) {
 844                                 $matches = false;
 845                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 846                                 if ($cnt) {
 847                                         $attributes = ['type' => 'Document',
 848                                                         'mediaType' => $matches[3],
 849                                                         'url' => $matches[1],
 850                                                         'name' => null];
 851
 852                                         if (trim($matches[4]) != '') {
 853                                                 $attributes['name'] = trim($matches[4]);
 854                                         }
 855
 856                                         $attachments[] = $attributes;
 857                                 }
 858                         }
 859                 }
 860
 861                 if ($type != 'Note') {
 862                         return $attachments;
 863                 }
 864
 865                 // Simplify image codes
 866                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 867
 868                 // Grab all pictures and create attachments out of them
 869                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 870                         foreach ($pictures[1] as $picture) {
 871                                 $imgdata = Image::getInfoFromURL($picture);
 872                                 if ($imgdata) {
 873                                         $attachments[] = ['type' => 'Document',
 874                                                 'mediaType' => $imgdata['mime'],
 875                                                 'url' => $picture,
 876                                                 'name' => null];
 877                                 }
 878                         }
 879                 }
 880
 881                 return $attachments;
 882         }
 883
 884         /**
 885          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 886          *
 887          * @param array $match Matching values for the callback
 888          * @return string Replaced mention
 889          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 890          */
 891         private static function mentionCallback($match)
 892         {
 893                 if (empty($match[1])) {
 894                         return;
 895                 }
 896
 897                 $data = Contact::getDetailsByURL($match[1]);
 898                 if (empty($data) || empty($data['nick'])) {
 899                         return;
 900                 }
 901
 902                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 903         }
 904
 905         /**
 906          * Remove image elements and replaces them with links to the image
 907          *
 908          * @param string $body
 909          *
 910          * @return string with replaced elements
 911          */
 912         private static function removePictures($body)
 913         {
 914                 // Simplify image codes
 915                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 916
 917                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 918                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 919
 920                 return $body;
 921         }
 922
 923         /**
 924          * Fetches the "context" value for a givem item array from the "conversation" table
 925          *
 926          * @param array $item
 927          *
 928          * @return string with context url
 929          * @throws \Exception
 930          */
 931         private static function fetchContextURLForItem($item)
 932         {
 933                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 934                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 935                         $context_uri = $conversation['conversation-href'];
 936                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 937                         $context_uri = $conversation['conversation-uri'];
 938                 } else {
 939                         $context_uri = $item['parent-uri'] . '#context';
 940                 }
 941                 return $context_uri;
 942         }
 943
 944         /**
 945          * Returns if the post contains sensitive content ("nsfw")
 946          *
 947          * @param integer $item_id
 948          *
 949          * @return boolean
 950          * @throws \Exception
 951          */
 952         private static function isSensitive($item_id)
 953         {
 954                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 955                 return DBA::exists('term', $condition);
 956         }
 957
 958         /**
 959          * Creates event data
 960          *
 961          * @param array $item
 962          *
 963          * @return array with the event data
 964          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 965          */
 966         public static function createEvent($item)
 967         {
 968                 $event = [];
 969                 $event['name'] = $item['event-summary'];
 970                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 971                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 972
 973                 if (!$item['event-nofinish']) {
 974                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 975                 }
 976
 977                 if (!empty($item['event-location'])) {
 978                         $item['location'] = $item['event-location'];
 979                         $event['location'] = self::createLocation($item);
 980                 }
 981
 982                 return $event;
 983         }
 984
 985         /**
 986          * Creates a note/article object array
 987          *
 988          * @param array $item
 989          *
 990          * @return array with the object data
 991          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 992          * @throws \ImagickException
 993          */
 994         public static function createNote($item)
 995         {
 996                 if ($item['event-type'] == 'event') {
 997                         $type = 'Event';
 998                 } elseif (!empty($item['title'])) {
 999                         $type = 'Article';
1000                 } else {
1001                         $type = 'Note';
1002                 }
1003
1004                 if ($item['deleted']) {
1005                         $type = 'Tombstone';
1006                 }
1007
1008                 $data = [];
1009                 $data['id'] = $item['uri'];
1010                 $data['type'] = $type;
1011
1012                 if ($item['deleted']) {
1013                         return $data;
1014                 }
1015
1016                 $data['summary'] = null; // Ignore by now
1017
1018                 if ($item['uri'] != $item['thr-parent']) {
1019                         $data['inReplyTo'] = $item['thr-parent'];
1020                 } else {
1021                         $data['inReplyTo'] = null;
1022                 }
1023
1024                 $data['diaspora:guid'] = $item['guid'];
1025                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1026
1027                 if ($item['created'] != $item['edited']) {
1028                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1029                 }
1030
1031                 $data['url'] = $item['plink'];
1032                 $data['attributedTo'] = $item['author-link'];
1033                 $data['sensitive'] = self::isSensitive($item['id']);
1034                 $data['context'] = self::fetchContextURLForItem($item);
1035
1036                 if (!empty($item['title'])) {
1037                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1038                 }
1039
1040                 $body = $item['body'];
1041
1042                 if ($type == 'Note') {
1043                         $body = self::removePictures($body);
1044                 }
1045
1046                 if ($type == 'Event') {
1047                         $data = array_merge($data, self::createEvent($item));
1048                 } else {
1049                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1050                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1051
1052                         $data['content'] = BBCode::convert($body, false, 7);
1053                 }
1054
1055                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1056
1057                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1058                         $data['diaspora:comment'] = $item['signed_text'];
1059                 }
1060
1061                 $data['attachment'] = self::createAttachmentList($item, $type);
1062                 $data['tag'] = self::createTagList($item);
1063
1064                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1065                         $data['location'] = self::createLocation($item);
1066                 }
1067
1068                 if (!empty($item['app'])) {
1069                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1070                 }
1071
1072                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
1073
1074                 return $data;
1075         }
1076
1077         /**
1078          * Creates an announce object entry
1079          *
1080          * @param array $item
1081          * @param array $data activity data
1082          *
1083          * @return array with activity data
1084          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1085          * @throws \ImagickException
1086          */
1087         private static function createAnnounce($item, $data)
1088         {
1089                 $announce = api_share_as_retweet($item);
1090                 if (empty($announce['plink'])) {
1091                         $data['type'] = 'Create';
1092                         $data['object'] = self::createNote($item);
1093                         return $data;
1094                 }
1095
1096                 // Fetch the original id of the object
1097                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1098                 if (!empty($activity)) {
1099                         $ldactivity = JsonLD::compact($activity);
1100                         $id = JsonLD::fetchElement($ldactivity, '@id');
1101                         if (!empty($id)) {
1102                                 $data['object'] = $id;
1103                                 return $data;
1104                         }
1105                 }
1106
1107                 $data['type'] = 'Create';
1108                 $data['object'] = self::createNote($item);
1109                 return $data;
1110         }
1111
1112         /**
1113          * Creates an activity id for a given contact id
1114          *
1115          * @param integer $cid Contact ID of target
1116          *
1117          * @return bool|string activity id
1118          */
1119         public static function activityIDFromContact($cid)
1120         {
1121                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1122                 if (!DBA::isResult($contact)) {
1123                         return false;
1124                 }
1125
1126                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1127                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1128                 return System::baseUrl() . '/activity/' . $uuid;
1129         }
1130
1131         /**
1132          * Transmits a contact suggestion to a given inbox
1133          *
1134          * @param integer $uid           User ID
1135          * @param string  $inbox         Target inbox
1136          * @param integer $suggestion_id Suggestion ID
1137          *
1138          * @return boolean was the transmission successful?
1139          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1140          */
1141         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1142         {
1143                 $owner = User::getOwnerDataById($uid);
1144
1145                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1146
1147                 $data = ['@context' => ActivityPub::CONTEXT,
1148                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1149                         'type' => 'Announce',
1150                         'actor' => $owner['url'],
1151                         'object' => $suggestion['url'],
1152                         'content' => $suggestion['note'],
1153                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1154                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1155                         'cc' => []];
1156
1157                 $signed = LDSignature::sign($data, $owner);
1158
1159                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1160                 return HTTPSignature::transmit($signed, $inbox, $uid);
1161         }
1162
1163         /**
1164          * Transmits a profile relocation to a given inbox
1165          *
1166          * @param integer $uid   User ID
1167          * @param string  $inbox Target inbox
1168          *
1169          * @return boolean was the transmission successful?
1170          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1171          */
1172         public static function sendProfileRelocation($uid, $inbox)
1173         {
1174                 $owner = User::getOwnerDataById($uid);
1175
1176                 $data = ['@context' => ActivityPub::CONTEXT,
1177                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1178                         'type' => 'dfrn:relocate',
1179                         'actor' => $owner['url'],
1180                         'object' => $owner['url'],
1181                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1182                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1183                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1184                         'cc' => []];
1185
1186                 $signed = LDSignature::sign($data, $owner);
1187
1188                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1189                 return HTTPSignature::transmit($signed, $inbox, $uid);
1190         }
1191
1192         /**
1193          * Transmits a profile deletion to a given inbox
1194          *
1195          * @param integer $uid   User ID
1196          * @param string  $inbox Target inbox
1197          *
1198          * @return boolean was the transmission successful?
1199          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1200          */
1201         public static function sendProfileDeletion($uid, $inbox)
1202         {
1203                 $owner = User::getOwnerDataById($uid);
1204
1205                 $data = ['@context' => ActivityPub::CONTEXT,
1206                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1207                         'type' => 'Delete',
1208                         'actor' => $owner['url'],
1209                         'object' => $owner['url'],
1210                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1211                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1212                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1213                         'cc' => []];
1214
1215                 $signed = LDSignature::sign($data, $owner);
1216
1217                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1218                 return HTTPSignature::transmit($signed, $inbox, $uid);
1219         }
1220
1221         /**
1222          * Transmits a profile change to a given inbox
1223          *
1224          * @param integer $uid   User ID
1225          * @param string  $inbox Target inbox
1226          *
1227          * @return boolean was the transmission successful?
1228          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1229          * @throws \ImagickException
1230          */
1231         public static function sendProfileUpdate($uid, $inbox)
1232         {
1233                 $owner = User::getOwnerDataById($uid);
1234                 $profile = APContact::getByURL($owner['url']);
1235
1236                 $data = ['@context' => ActivityPub::CONTEXT,
1237                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1238                         'type' => 'Update',
1239                         'actor' => $owner['url'],
1240                         'object' => self::getProfile($uid),
1241                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1242                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1243                         'to' => [$profile['followers']],
1244                         'cc' => []];
1245
1246                 $signed = LDSignature::sign($data, $owner);
1247
1248                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1249                 return HTTPSignature::transmit($signed, $inbox, $uid);
1250         }
1251
1252         /**
1253          * Transmits a given activity to a target
1254          *
1255          * @param string  $activity Type name
1256          * @param string  $target   Target profile
1257          * @param integer $uid      User ID
1258          * @return bool
1259          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1260          * @throws \ImagickException
1261          * @throws \Exception
1262          */
1263         public static function sendActivity($activity, $target, $uid, $id = '')
1264         {
1265                 $profile = APContact::getByURL($target);
1266
1267                 $owner = User::getOwnerDataById($uid);
1268
1269                 if (empty($id)) {
1270                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1271                 }
1272
1273                 $data = ['@context' => ActivityPub::CONTEXT,
1274                         'id' => $id,
1275                         'type' => $activity,
1276                         'actor' => $owner['url'],
1277                         'object' => $profile['url'],
1278                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1279                         'to' => [$profile['url']]];
1280
1281                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1282
1283                 $signed = LDSignature::sign($data, $owner);
1284                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1285         }
1286
1287         /**
1288          * Transmits a "follow object" activity to a target
1289          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1290          *
1291          * @param string  $object Object URL
1292          * @param string  $target Target profile
1293          * @param integer $uid    User ID
1294          * @return bool
1295          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1296          * @throws \ImagickException
1297          * @throws \Exception
1298          */
1299         public static function sendFollowObject($object, $target, $uid = 0)
1300         {
1301                 $profile = APContact::getByURL($target);
1302
1303                 if (empty($uid)) {
1304                         // Fetch the list of administrators
1305                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1306
1307                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1308                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1309                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1310                         $uid = $first_user['uid'];
1311                 }
1312
1313                 $owner = User::getOwnerDataById($uid);
1314
1315                 $data = ['@context' => ActivityPub::CONTEXT,
1316                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1317                         'type' => 'Follow',
1318                         'actor' => $owner['url'],
1319                         'object' => $object,
1320                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1321                         'to' => [$profile['url']]];
1322
1323                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1324
1325                 $signed = LDSignature::sign($data, $owner);
1326                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1327         }
1328
1329         /**
1330          * Transmit a message that the contact request had been accepted
1331          *
1332          * @param string  $target Target profile
1333          * @param         $id
1334          * @param integer $uid    User ID
1335          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1336          * @throws \ImagickException
1337          */
1338         public static function sendContactAccept($target, $id, $uid)
1339         {
1340                 $profile = APContact::getByURL($target);
1341
1342                 $owner = User::getOwnerDataById($uid);
1343                 $data = ['@context' => ActivityPub::CONTEXT,
1344                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1345                         'type' => 'Accept',
1346                         'actor' => $owner['url'],
1347                         'object' => ['id' => $id, 'type' => 'Follow',
1348                                 'actor' => $profile['url'],
1349                                 'object' => $owner['url']],
1350                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1351                         'to' => [$profile['url']]];
1352
1353                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1354
1355                 $signed = LDSignature::sign($data, $owner);
1356                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1357         }
1358
1359         /**
1360          * Reject a contact request or terminates the contact relation
1361          *
1362          * @param string  $target Target profile
1363          * @param         $id
1364          * @param integer $uid    User ID
1365          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1366          * @throws \ImagickException
1367          */
1368         public static function sendContactReject($target, $id, $uid)
1369         {
1370                 $profile = APContact::getByURL($target);
1371
1372                 $owner = User::getOwnerDataById($uid);
1373                 $data = ['@context' => ActivityPub::CONTEXT,
1374                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1375                         'type' => 'Reject',
1376                         'actor' => $owner['url'],
1377                         'object' => ['id' => $id, 'type' => 'Follow',
1378                                 'actor' => $profile['url'],
1379                                 'object' => $owner['url']],
1380                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1381                         'to' => [$profile['url']]];
1382
1383                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1384
1385                 $signed = LDSignature::sign($data, $owner);
1386                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1387         }
1388
1389         /**
1390          * Transmits a message that we don't want to follow this contact anymore
1391          *
1392          * @param string  $target Target profile
1393          * @param integer $uid    User ID
1394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1395          * @throws \ImagickException
1396          * @throws \Exception
1397          */
1398         public static function sendContactUndo($target, $cid, $uid)
1399         {
1400                 $profile = APContact::getByURL($target);
1401
1402                 $object_id = self::activityIDFromContact($cid);
1403                 if (empty($object_id)) {
1404                         return;
1405                 }
1406
1407                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1408
1409                 $owner = User::getOwnerDataById($uid);
1410                 $data = ['@context' => ActivityPub::CONTEXT,
1411                         'id' => $id,
1412                         'type' => 'Undo',
1413                         'actor' => $owner['url'],
1414                         'object' => ['id' => $object_id, 'type' => 'Follow',
1415                                 'actor' => $owner['url'],
1416                                 'object' => $profile['url']],
1417                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1418                         'to' => [$profile['url']]];
1419
1420                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1421
1422                 $signed = LDSignature::sign($data, $owner);
1423                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1424         }
1425 }