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