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\Content\Feature;
   9 use Friendica\Database\DBA;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\Logger;
  12 use Friendica\Core\System;
  13 use Friendica\Util\HTTPSignature;
  14 use Friendica\Core\Protocol;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Contact;
  17 use Friendica\Model\APContact;
  18 use Friendica\Model\Item;
  19 use Friendica\Model\Term;
  20 use Friendica\Model\User;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\Plaintext;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\LDSignature;
  26 use Friendica\Model\Profile;
  27 use Friendica\Object\Image;
  28 use Friendica\Protocol\ActivityPub;
  29 use Friendica\Core\Cache;
  30 use Friendica\Util\Map;
  31 use Friendica\Util\Network;
  32
  33 require_once 'include/api.php';
  34 require_once 'mod/share.php';
  35
  36 /**
  37  * @brief ActivityPub Transmitter Protocol class
  38  *
  39  * To-Do:
  40  * - Undo Announce
  41  */
  42 class Transmitter
  43 {
  44         /**
  45          * collects the lost of followers of the given owner
  46          *
  47          * @param array   $owner Owner array
  48          * @param integer $page  Page number
  49          *
  50          * @return array of owners
  51          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  52          */
  53         public static function getFollowers($owner, $page = null)
  54         {
  55                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  56                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  57                 $count = DBA::count('contact', $condition);
  58
  59                 $data = ['@context' => ActivityPub::CONTEXT];
  60                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  61                 $data['type'] = 'OrderedCollection';
  62                 $data['totalItems'] = $count;
  63
  64                 // When we hide our friends we will only show the pure number but don't allow more.
  65                 $profile = Profile::getByUID($owner['uid']);
  66                 if (!empty($profile['hide-friends'])) {
  67                         return $data;
  68                 }
  69
  70                 if (empty($page)) {
  71                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  72                 } else {
  73                         $list = [];
  74
  75                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  76                         while ($contact = DBA::fetch($contacts)) {
  77                                 $list[] = $contact['url'];
  78                         }
  79
  80                         if (!empty($list)) {
  81                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  82                         }
  83
  84                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  85
  86                         $data['orderedItems'] = $list;
  87                 }
  88
  89                 return $data;
  90         }
  91
  92         /**
  93          * Create list of following contacts
  94          *
  95          * @param array   $owner Owner array
  96          * @param integer $page  Page numbe
  97          *
  98          * @return array of following contacts
  99          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 100          */
 101         public static function getFollowing($owner, $page = null)
 102         {
 103                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 104                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 105                 $count = DBA::count('contact', $condition);
 106
 107                 $data = ['@context' => ActivityPub::CONTEXT];
 108                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 109                 $data['type'] = 'OrderedCollection';
 110                 $data['totalItems'] = $count;
 111
 112                 // When we hide our friends we will only show the pure number but don't allow more.
 113                 $profile = Profile::getByUID($owner['uid']);
 114                 if (!empty($profile['hide-friends'])) {
 115                         return $data;
 116                 }
 117
 118                 if (empty($page)) {
 119                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 120                 } else {
 121                         $list = [];
 122
 123                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 124                         while ($contact = DBA::fetch($contacts)) {
 125                                 $list[] = $contact['url'];
 126                         }
 127
 128                         if (!empty($list)) {
 129                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 130                         }
 131
 132                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 133
 134                         $data['orderedItems'] = $list;
 135                 }
 136
 137                 return $data;
 138         }
 139
 140         /**
 141          * Public posts for the given owner
 142          *
 143          * @param array   $owner Owner array
 144          * @param integer $page  Page numbe
 145          *
 146          * @return array of posts
 147          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 148          * @throws \ImagickException
 149          */
 150         public static function getOutbox($owner, $page = null)
 151         {
 152                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 153
 154                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 155                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 156                         'deleted' => false, 'visible' => true, 'moderated' => false];
 157                 $count = DBA::count('item', $condition);
 158
 159                 $data = ['@context' => ActivityPub::CONTEXT];
 160                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 161                 $data['type'] = 'OrderedCollection';
 162                 $data['totalItems'] = $count;
 163
 164                 if (empty($page)) {
 165                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 166                 } else {
 167                         $list = [];
 168
 169                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 170
 171                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 172                         while ($item = Item::fetch($items)) {
 173                                 $object = self::createObjectFromItemID($item['id']);
 174                                 unset($object['@context']);
 175                                 $list[] = $object;
 176                         }
 177
 178                         if (!empty($list)) {
 179                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 180                         }
 181
 182                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 183
 184                         $data['orderedItems'] = $list;
 185                 }
 186
 187                 return $data;
 188         }
 189
 190         /**
 191          * Return the service array containing information the used software and it's url
 192          *
 193          * @return array with service data
 194          */
 195         private static function getService()
 196         {
 197                 return ['type' => 'Service',
 198                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 199                         'url' => BaseObject::getApp()->getBaseURL()];
 200         }
 201
 202         /**
 203          * Return the ActivityPub profile of the given user
 204          *
 205          * @param integer $uid User ID
 206          * @return array with profile data
 207          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 208          */
 209         public static function getProfile($uid)
 210         {
 211                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 212                         'account_removed' => false, 'verified' => true];
 213                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 214                 $user = DBA::selectFirst('user', $fields, $condition);
 215                 if (!DBA::isResult($user)) {
 216                         return [];
 217                 }
 218
 219                 $fields = ['locality', 'region', 'country-name'];
 220                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 221                 if (!DBA::isResult($profile)) {
 222                         return [];
 223                 }
 224
 225                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 226                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 227                 if (!DBA::isResult($contact)) {
 228                         return [];
 229                 }
 230
 231                 // On old installations and never changed contacts this might not be filled
 232                 if (empty($contact['avatar'])) {
 233                         $contact['avatar'] = $contact['photo'];
 234                 }
 235
 236                 $data = ['@context' => ActivityPub::CONTEXT];
 237                 $data['id'] = $contact['url'];
 238                 $data['diaspora:guid'] = $user['guid'];
 239                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 240                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 241                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 242                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 243                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 244                 $data['preferredUsername'] = $user['nickname'];
 245                 $data['name'] = $contact['name'];
 246                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 247                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 248                 $data['summary'] = $contact['about'];
 249                 $data['url'] = $contact['url'];
 250                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 251                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 252                         'owner' => $contact['url'],
 253                         'publicKeyPem' => $user['pubkey']];
 254                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 255                 $data['icon'] = ['type' => 'Image',
 256                         'url' => $contact['avatar']];
 257
 258                 $data['generator'] = self::getService();
 259
 260                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 261                 return $data;
 262         }
 263
 264         /**
 265          * @param string $username
 266          * @return array
 267          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 268          */
 269         public static function getDeletedUser($username)
 270         {
 271                 return [
 272                         '@context' => ActivityPub::CONTEXT,
 273                         'id' => System::baseUrl() . '/profile/' . $username,
 274                         'type' => 'Tombstone',
 275                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 276                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 277                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 278                 ];
 279         }
 280
 281         /**
 282          * Returns an array with permissions of a given item array
 283          *
 284          * @param array $item
 285          *
 286          * @return array with permissions
 287          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 288          * @throws \ImagickException
 289          */
 290         private static function fetchPermissionBlockFromConversation($item)
 291         {
 292                 if (empty($item['thr-parent'])) {
 293                         return [];
 294                 }
 295
 296                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 297                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 298                 if (!DBA::isResult($conversation)) {
 299                         return [];
 300                 }
 301
 302                 $activity = json_decode($conversation['source'], true);
 303
 304                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 305                 $profile = APContact::getByURL($actor);
 306
 307                 $item_profile = APContact::getByURL($item['author-link']);
 308                 $exclude[] = $item['author-link'];
 309
 310                 if ($item['gravity'] == GRAVITY_PARENT) {
 311                         $exclude[] = $item['owner-link'];
 312                 }
 313
 314                 $permissions['to'][] = $actor;
 315
 316                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 317                         if (empty($activity[$element])) {
 318                                 continue;
 319                         }
 320                         if (is_string($activity[$element])) {
 321                                 $activity[$element] = [$activity[$element]];
 322                         }
 323
 324                         foreach ($activity[$element] as $receiver) {
 325                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 326                                         $permissions[$element][] = $item_profile['followers'];
 327                                 } elseif (!in_array($receiver, $exclude)) {
 328                                         $permissions[$element][] = $receiver;
 329                                 }
 330                         }
 331                 }
 332                 return $permissions;
 333         }
 334
 335         /**
 336          * Creates an array of permissions from an item thread
 337          *
 338          * @param array   $item       Item array
 339          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 340          * @param integer $last_id    Last item id for adding receivers
 341          * @param boolean $forum_mode "true" means that we are sending content to a forum
 342          *
 343          * @return array with permission data
 344          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 345          * @throws \ImagickException
 346          */
 347         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 348         {
 349                 if ($last_id == 0) {
 350                         $last_id = $item['id'];
 351                 }
 352
 353                 $always_bcc = false;
 354
 355                 // Check if we should always deliver our stuff via BCC
 356                 if (!empty($item['uid'])) {
 357                         $profile = Profile::getByUID($item['uid']);
 358                         if (!empty($profile)) {
 359                                 $always_bcc = $profile['hide-friends'];
 360                         }
 361                 }
 362
 363                 if (Config::get('debug', 'total_ap_delivery')) {
 364                         // Will be activated in a later step
 365                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 366                 } else {
 367                         // For now only send to these contacts:
 368                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 369                 }
 370
 371                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 372
 373                 if ($item['gravity'] == GRAVITY_PARENT) {
 374                         $actor_profile = APContact::getByURL($item['owner-link']);
 375                 } else {
 376                         $actor_profile = APContact::getByURL($item['author-link']);
 377                 }
 378
 379                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 380
 381                 if (!$item['private']) {
 382                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 383
 384                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 385
 386                         foreach ($terms as $term) {
 387                                 $profile = APContact::getByURL($term['url'], false);
 388                                 if (!empty($profile)) {
 389                                         $data['to'][] = $profile['url'];
 390                                 }
 391                         }
 392                 } else {
 393                         $receiver_list = Item::enumeratePermissions($item);
 394
 395                         foreach ($terms as $term) {
 396                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 397                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 398                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 399                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 400                                                 continue;
 401                                         }
 402
 403                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 404                                                 $data['to'][] = $profile['url'];
 405                                         }
 406                                 }
 407                         }
 408
 409                         foreach ($receiver_list as $receiver) {
 410                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 411                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 412                                         continue;
 413                                 }
 414
 415                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 416                                         if ($contact['hidden'] || $always_bcc) {
 417                                                 $data['bcc'][] = $profile['url'];
 418                                         } else {
 419                                                 $data['cc'][] = $profile['url'];
 420                                         }
 421                                 }
 422                         }
 423                 }
 424
 425                 if (!empty($item['parent'])) {
 426                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 427                         while ($parent = Item::fetch($parents)) {
 428                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 429                                         $profile = APContact::getByURL($parent['owner-link'], false);
 430                                         if (!empty($profile)) {
 431                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 432                                                         // Comments to forums are directed to the forum
 433                                                         // But comments to forums aren't directed to the followers collection
 434                                                         if ($profile['type'] == 'Group') {
 435                                                                 $data['to'][] = $profile['url'];
 436                                                         } else {
 437                                                                 $data['cc'][] = $profile['url'];
 438                                                                 if (!$item['private']) {
 439                                                                         $data['cc'][] = $actor_profile['followers'];
 440                                                                 }
 441                                                         }
 442                                                 } else {
 443                                                         // Public thread parent post always are directed to the followes
 444                                                         if (!$item['private'] && !$forum_mode) {
 445                                                                 $data['cc'][] = $actor_profile['followers'];
 446                                                         }
 447                                                 }
 448                                         }
 449                                 }
 450
 451                                 // Don't include data from future posts
 452                                 if ($parent['id'] >= $last_id) {
 453                                         continue;
 454                                 }
 455
 456                                 $profile = APContact::getByURL($parent['author-link'], false);
 457                                 if (!empty($profile)) {
 458                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 459                                                 $data['to'][] = $profile['url'];
 460                                         } else {
 461                                                 $data['cc'][] = $profile['url'];
 462                                         }
 463                                 }
 464                         }
 465                         DBA::close($parents);
 466                 }
 467
 468                 $data['to'] = array_unique($data['to']);
 469                 $data['cc'] = array_unique($data['cc']);
 470                 $data['bcc'] = array_unique($data['bcc']);
 471
 472                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 473                         unset($data['to'][$key]);
 474                 }
 475
 476                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 477                         unset($data['cc'][$key]);
 478                 }
 479
 480                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 481                         unset($data['bcc'][$key]);
 482                 }
 483
 484                 foreach ($data['to'] as $to) {
 485                         if (($key = array_search($to, $data['cc'])) !== false) {
 486                                 unset($data['cc'][$key]);
 487                         }
 488
 489                         if (($key = array_search($to, $data['bcc'])) !== false) {
 490                                 unset($data['bcc'][$key]);
 491                         }
 492                 }
 493
 494                 foreach ($data['cc'] as $cc) {
 495                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 496                                 unset($data['bcc'][$key]);
 497                         }
 498                 }
 499
 500                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 501
 502                 if (!$blindcopy) {
 503                         unset($receivers['bcc']);
 504                 }
 505
 506                 return $receivers;
 507         }
 508
 509         /**
 510          * Check if an inbox is archived
 511          *
 512          * @param string $url Inbox url
 513          *
 514          * @return boolean "true" if inbox is archived
 515          */
 516         private static function archivedInbox($url)
 517         {
 518                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 519         }
 520
 521         /**
 522          * Fetches a list of inboxes of followers of a given user
 523          *
 524          * @param integer $uid      User ID
 525          * @param boolean $personal fetch personal inboxes
 526          *
 527          * @return array of follower inboxes
 528          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 529          * @throws \ImagickException
 530          */
 531         public static function fetchTargetInboxesforUser($uid, $personal = false)
 532         {
 533                 $inboxes = [];
 534
 535                 if (Config::get('debug', 'total_ap_delivery')) {
 536                         // Will be activated in a later step
 537                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 538                 } else {
 539                         // For now only send to these contacts:
 540                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 541                 }
 542
 543                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 544
 545                 if (!empty($uid)) {
 546                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 547                 }
 548
 549                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 550                 while ($contact = DBA::fetch($contacts)) {
 551                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 552                                 continue;
 553                         }
 554
 555                         if (Network::isUrlBlocked($contact['url'])) {
 556                                 continue;
 557                         }
 558
 559                         $profile = APContact::getByURL($contact['url'], false);
 560                         if (!empty($profile)) {
 561                                 if (empty($profile['sharedinbox']) || $personal) {
 562                                         $target = $profile['inbox'];
 563                                 } else {
 564                                         $target = $profile['sharedinbox'];
 565                                 }
 566                                 if (!self::archivedInbox($target)) {
 567                                         $inboxes[$target] = $target;
 568                                 }
 569                         }
 570                 }
 571                 DBA::close($contacts);
 572
 573                 return $inboxes;
 574         }
 575
 576         /**
 577          * Fetches an array of inboxes for the given item and user
 578          *
 579          * @param array   $item       Item array
 580          * @param integer $uid        User ID
 581          * @param boolean $personal   fetch personal inboxes
 582          * @param integer $last_id    Last item id for adding receivers
 583          * @param boolean $forum_mode "true" means that we are sending content to a forum
 584          * @return array with inboxes
 585          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 586          * @throws \ImagickException
 587          */
 588         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 589         {
 590                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 591                 if (empty($permissions)) {
 592                         return [];
 593                 }
 594
 595                 $inboxes = [];
 596
 597                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 598                         $item_profile = APContact::getByURL($item['author-link'], false);
 599                 } else {
 600                         $item_profile = APContact::getByURL($item['owner-link'], false);
 601                 }
 602
 603                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 604                         if (empty($permissions[$element])) {
 605                                 continue;
 606                         }
 607
 608                         $blindcopy = in_array($element, ['bto', 'bcc']);
 609
 610                         foreach ($permissions[$element] as $receiver) {
 611                                 if (Network::isUrlBlocked($receiver)) {
 612                                         continue;
 613                                 }
 614
 615                                 if ($receiver == $item_profile['followers']) {
 616                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 617                                 } else {
 618                                         $profile = APContact::getByURL($receiver, false);
 619                                         if (!empty($profile)) {
 620                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 621                                                         $target = $profile['inbox'];
 622                                                 } else {
 623                                                         $target = $profile['sharedinbox'];
 624                                                 }
 625                                                 if (!self::archivedInbox($target)) {
 626                                                         $inboxes[$target] = $target;
 627                                                 }
 628                                         }
 629                                 }
 630                         }
 631                 }
 632
 633                 return $inboxes;
 634         }
 635
 636         /**
 637          * Creates an array in the structure of the item table for a given mail id
 638          *
 639          * @param integer $mail_id
 640          *
 641          * @return array
 642          * @throws \Exception
 643          */
 644         public static function ItemArrayFromMail($mail_id)
 645         {
 646                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 647
 648                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 649
 650                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 651                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 652                 $mail['allow_gid'] = '';
 653                 $mail['deny_cid'] = '';
 654                 $mail['deny_gid'] = '';
 655                 $mail['private'] = true;
 656                 $mail['deleted'] = false;
 657                 $mail['edited'] = $mail['created'];
 658                 $mail['plink'] = $mail['uri'];
 659                 $mail['thr-parent'] = $reply['uri'];
 660                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 661
 662                 $mail['event-type'] = '';
 663                 $mail['attach'] = '';
 664
 665                 $mail['parent'] = 0;
 666
 667                 return $mail;
 668         }
 669
 670         /**
 671          * Creates an activity array for a given mail id
 672          *
 673          * @param integer $mail_id
 674          * @param boolean $object_mode Is the activity item is used inside another object?
 675          *
 676          * @return array of activity
 677          * @throws \Exception
 678          */
 679         public static function createActivityFromMail($mail_id, $object_mode = false)
 680         {
 681                 $mail = self::ItemArrayFromMail($mail_id);
 682                 $object = self::createNote($mail);
 683
 684                 $object['to'] = $object['cc'];
 685                 unset($object['cc']);
 686
 687                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => 'test']];
 688
 689                 if (!$object_mode) {
 690                         $data = ['@context' => ActivityPub::CONTEXT];
 691                 } else {
 692                         $data = [];
 693                 }
 694
 695                 $data['id'] = $mail['uri'] . '#Create';
 696                 $data['type'] = 'Create';
 697                 $data['actor'] = $mail['author-link'];
 698                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 699                 $data['instrument'] = self::getService();
 700                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 701
 702                 if (empty($data['to']) && !empty($data['cc'])) {
 703                         $data['to'] = $data['cc'];
 704                 }
 705
 706                 if (empty($data['to']) && !empty($data['bcc'])) {
 707                         $data['to'] = $data['bcc'];
 708                 }
 709
 710                 unset($data['cc']);
 711                 unset($data['bcc']);
 712
 713                 $object['to'] = $data['to'];
 714                 unset($object['cc']);
 715                 unset($object['bcc']);
 716
 717                 $data['directMessage'] = true;
 718
 719                 $data['object'] = $object;
 720
 721                 $owner = User::getOwnerDataById($mail['uid']);
 722
 723                 if (!$object_mode && !empty($owner)) {
 724                         return LDSignature::sign($data, $owner);
 725                 } else {
 726                         return $data;
 727                 }
 728         }
 729
 730         /**
 731          * Returns the activity type of a given item
 732          *
 733          * @param array $item
 734          *
 735          * @return string with activity type
 736          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 737          * @throws \ImagickException
 738          */
 739         private static function getTypeOfItem($item)
 740         {
 741                 $reshared = false;
 742
 743                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 744                 if (strpos($item['body'], "[share") === 0) {
 745                         $announce = api_share_as_retweet($item);
 746                         $reshared = !empty($announce['plink']);
 747                 }
 748
 749                 if ($reshared) {
 750                         $type = 'Announce';
 751                 } elseif ($item['verb'] == ACTIVITY_POST) {
 752                         if ($item['created'] == $item['edited']) {
 753                                 $type = 'Create';
 754                         } else {
 755                                 $type = 'Update';
 756                         }
 757                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 758                         $type = 'Like';
 759                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 760                         $type = 'Dislike';
 761                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 762                         $type = 'Accept';
 763                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 764                         $type = 'Reject';
 765                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 766                         $type = 'TentativeAccept';
 767                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 768                         $type = 'Follow';
 769                 } else {
 770                         $type = '';
 771                 }
 772
 773                 return $type;
 774         }
 775
 776         /**
 777          * Creates the activity or fetches it from the cache
 778          *
 779          * @param integer $item_id
 780          * @param boolean $force Force new cache entry
 781          *
 782          * @return array with the activity
 783          * @throws \Exception
 784          */
 785         public static function createCachedActivityFromItem($item_id, $force = false)
 786         {
 787                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 788
 789                 if (!$force) {
 790                         $data = Cache::get($cachekey);
 791                         if (!is_null($data)) {
 792                                 return $data;
 793                         }
 794                 }
 795
 796                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 797
 798                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 799                 return $data;
 800         }
 801
 802         /**
 803          * Creates an activity array for a given item id
 804          *
 805          * @param integer $item_id
 806          * @param boolean $object_mode Is the activity item is used inside another object?
 807          *
 808          * @return array of activity
 809          * @throws \Exception
 810          */
 811         public static function createActivityFromItem($item_id, $object_mode = false)
 812         {
 813                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 814
 815                 if (!DBA::isResult($item)) {
 816                         return false;
 817                 }
 818
 819                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 820                         $owner = User::getOwnerDataById($item['uid']);
 821                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 822                                 $type = 'Announce';
 823
 824                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 825                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 826                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 827                         }
 828                 }
 829
 830                 if (empty($type)) {
 831                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 832                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 833                         if (DBA::isResult($conversation)) {
 834                                 $data = json_decode($conversation['source'], true);
 835                                 if (!empty($data)) {
 836                                         return $data;
 837                                 }
 838                         }
 839
 840                         $type = self::getTypeOfItem($item);
 841                 }
 842
 843                 if (!$object_mode) {
 844                         $data = ['@context' => ActivityPub::CONTEXT];
 845
 846                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 847                                 $type = 'Undo';
 848                         } elseif ($item['deleted']) {
 849                                 $type = 'Delete';
 850                         }
 851                 } else {
 852                         $data = [];
 853                 }
 854
 855                 $data['id'] = $item['uri'] . '#' . $type;
 856                 $data['type'] = $type;
 857
 858                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 859                         $data['actor'] = $item['author-link'];
 860                 } else {
 861                         $data['actor'] = $item['owner-link'];
 862                 }
 863
 864                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 865
 866                 $data['instrument'] = self::getService();
 867
 868                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 869
 870                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 871                         $data['object'] = self::createNote($item);
 872                 } elseif ($data['type'] == 'Announce') {
 873                         $data = self::createAnnounce($item, $data);
 874                 } elseif ($data['type'] == 'Follow') {
 875                         $data['object'] = $item['parent-uri'];
 876                 } elseif ($data['type'] == 'Undo') {
 877                         $data['object'] = self::createActivityFromItem($item_id, true);
 878                 } else {
 879                         $data['diaspora:guid'] = $item['guid'];
 880                         if (!empty($item['signed_text'])) {
 881                                 $data['diaspora:like'] = $item['signed_text'];
 882                         }
 883                         $data['object'] = $item['thr-parent'];
 884                 }
 885
 886                 if (!empty($item['contact-uid'])) {
 887                         $uid = $item['contact-uid'];
 888                 } else {
 889                         $uid = $item['uid'];
 890                 }
 891
 892                 $owner = User::getOwnerDataById($uid);
 893
 894                 if (!$object_mode && !empty($owner)) {
 895                         return LDSignature::sign($data, $owner);
 896                 } else {
 897                         return $data;
 898                 }
 899
 900                 /// @todo Create "conversation" entry
 901         }
 902
 903         /**
 904          * Creates an object array for a given item id
 905          *
 906          * @param integer $item_id
 907          *
 908          * @return array with the object data
 909          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 910          * @throws \ImagickException
 911          */
 912         public static function createObjectFromItemID($item_id)
 913         {
 914                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 915
 916                 if (!DBA::isResult($item)) {
 917                         return false;
 918                 }
 919
 920                 $data = ['@context' => ActivityPub::CONTEXT];
 921                 $data = array_merge($data, self::createNote($item));
 922
 923                 return $data;
 924         }
 925
 926         /**
 927          * Creates a location entry for a given item array
 928          *
 929          * @param array $item
 930          *
 931          * @return array with location array
 932          */
 933         private static function createLocation($item)
 934         {
 935                 $location = ['type' => 'Place'];
 936
 937                 if (!empty($item['location'])) {
 938                         $location['name'] = $item['location'];
 939                 }
 940
 941                 $coord = [];
 942
 943                 if (empty($item['coord'])) {
 944                         $coord = Map::getCoordinates($item['location']);
 945                 } else {
 946                         $coords = explode(' ', $item['coord']);
 947                         if (count($coords) == 2) {
 948                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 949                         }
 950                 }
 951
 952                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 953                         $location['latitude'] = $coord['lat'];
 954                         $location['longitude'] = $coord['lon'];
 955                 }
 956
 957                 return $location;
 958         }
 959
 960         /**
 961          * Returns a tag array for a given item array
 962          *
 963          * @param array $item
 964          *
 965          * @return array of tags
 966          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 967          */
 968         private static function createTagList($item)
 969         {
 970                 $tags = [];
 971
 972                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 973                 foreach ($terms as $term) {
 974                         if ($term['type'] == Term::HASHTAG) {
 975                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 976                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 977                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 978                                 $contact = Contact::getDetailsByURL($term['url']);
 979                                 if (!empty($contact['addr'])) {
 980                                         $mention = '@' . $contact['addr'];
 981                                 } else {
 982                                         $mention = '@' . $term['url'];
 983                                 }
 984
 985                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 986                         }
 987                 }
 988                 return $tags;
 989         }
 990
 991         /**
 992          * Adds attachment data to the JSON document
 993          *
 994          * @param array  $item Data of the item that is to be posted
 995          * @param string $type Object type
 996          *
 997          * @return array with attachment data
 998          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 999          */
1000         private static function createAttachmentList($item, $type)
1001         {
1002                 $attachments = [];
1003
1004                 $arr = explode('[/attach],', $item['attach']);
1005                 if (count($arr)) {
1006                         foreach ($arr as $r) {
1007                                 $matches = false;
1008                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1009                                 if ($cnt) {
1010                                         $attributes = ['type' => 'Document',
1011                                                         'mediaType' => $matches[3],
1012                                                         'url' => $matches[1],
1013                                                         'name' => null];
1014
1015                                         if (trim($matches[4]) != '') {
1016                                                 $attributes['name'] = trim($matches[4]);
1017                                         }
1018
1019                                         $attachments[] = $attributes;
1020                                 }
1021                         }
1022                 }
1023
1024                 if ($type != 'Note') {
1025                         return $attachments;
1026                 }
1027
1028                 // Simplify image codes
1029                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1030
1031                 // Grab all pictures and create attachments out of them
1032                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1033                         foreach ($pictures[1] as $picture) {
1034                                 $imgdata = Image::getInfoFromURL($picture);
1035                                 if ($imgdata) {
1036                                         $attachments[] = ['type' => 'Document',
1037                                                 'mediaType' => $imgdata['mime'],
1038                                                 'url' => $picture,
1039                                                 'name' => null];
1040                                 }
1041                         }
1042                 }
1043
1044                 return $attachments;
1045         }
1046
1047         /**
1048          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
1049          *
1050          * @param array $match Matching values for the callback
1051          * @return string Replaced mention
1052          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1053          */
1054         private static function mentionCallback($match)
1055         {
1056                 if (empty($match[1])) {
1057                         return '';
1058                 }
1059
1060                 $data = Contact::getDetailsByURL($match[1]);
1061                 if (empty($data['nick'])) {
1062                         return $match[0];
1063                 }
1064
1065                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1066         }
1067
1068         /**
1069          * Remove image elements and replaces them with links to the image
1070          *
1071          * @param string $body
1072          *
1073          * @return string with replaced elements
1074          */
1075         private static function removePictures($body)
1076         {
1077                 // Simplify image codes
1078                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1079
1080                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
1081                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
1082
1083                 return $body;
1084         }
1085
1086         /**
1087          * Fetches the "context" value for a givem item array from the "conversation" table
1088          *
1089          * @param array $item
1090          *
1091          * @return string with context url
1092          * @throws \Exception
1093          */
1094         private static function fetchContextURLForItem($item)
1095         {
1096                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1097                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1098                         $context_uri = $conversation['conversation-href'];
1099                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1100                         $context_uri = $conversation['conversation-uri'];
1101                 } else {
1102                         $context_uri = $item['parent-uri'] . '#context';
1103                 }
1104                 return $context_uri;
1105         }
1106
1107         /**
1108          * Returns if the post contains sensitive content ("nsfw")
1109          *
1110          * @param integer $item_id
1111          *
1112          * @return boolean
1113          * @throws \Exception
1114          */
1115         private static function isSensitive($item_id)
1116         {
1117                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
1118                 return DBA::exists('term', $condition);
1119         }
1120
1121         /**
1122          * Creates event data
1123          *
1124          * @param array $item
1125          *
1126          * @return array with the event data
1127          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1128          */
1129         public static function createEvent($item)
1130         {
1131                 $event = [];
1132                 $event['name'] = $item['event-summary'];
1133                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
1134                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1135
1136                 if (!$item['event-nofinish']) {
1137                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1138                 }
1139
1140                 if (!empty($item['event-location'])) {
1141                         $item['location'] = $item['event-location'];
1142                         $event['location'] = self::createLocation($item);
1143                 }
1144
1145                 return $event;
1146         }
1147
1148         /**
1149          * Creates a note/article object array
1150          *
1151          * @param array $item
1152          *
1153          * @return array with the object data
1154          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1155          * @throws \ImagickException
1156          */
1157         public static function createNote($item)
1158         {
1159                 if ($item['event-type'] == 'event') {
1160                         $type = 'Event';
1161                 } elseif (!empty($item['title'])) {
1162                         $type = 'Article';
1163                 } else {
1164                         $type = 'Note';
1165                 }
1166
1167                 if ($item['deleted']) {
1168                         $type = 'Tombstone';
1169                 }
1170
1171                 $data = [];
1172                 $data['id'] = $item['uri'];
1173                 $data['type'] = $type;
1174
1175                 if ($item['deleted']) {
1176                         return $data;
1177                 }
1178
1179                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1180
1181                 if ($item['uri'] != $item['thr-parent']) {
1182                         $data['inReplyTo'] = $item['thr-parent'];
1183                 } else {
1184                         $data['inReplyTo'] = null;
1185                 }
1186
1187                 $data['diaspora:guid'] = $item['guid'];
1188                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1189
1190                 if ($item['created'] != $item['edited']) {
1191                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1192                 }
1193
1194                 $data['url'] = $item['plink'];
1195                 $data['attributedTo'] = $item['author-link'];
1196                 $data['sensitive'] = self::isSensitive($item['id']);
1197                 $data['context'] = self::fetchContextURLForItem($item);
1198
1199                 if (!empty($item['title'])) {
1200                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1201                 }
1202
1203                 $permission_block = self::createPermissionBlockForItem($item, false);
1204
1205                 $body = $item['body'];
1206
1207                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1208                         $body = self::prependMentions($body, $permission_block);
1209                 }
1210
1211                 if ($type == 'Note') {
1212                         $body = self::removePictures($body);
1213                 } elseif (($type == 'Article') && empty($data['summary'])) {
1214                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1215                 }
1216
1217                 if ($type == 'Event') {
1218                         $data = array_merge($data, self::createEvent($item));
1219                 } else {
1220                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1221                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1222
1223                         $data['content'] = BBCode::convert($body, false, 7);
1224                 }
1225
1226                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1227
1228                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1229                         $data['diaspora:comment'] = $item['signed_text'];
1230                 }
1231
1232                 $data['attachment'] = self::createAttachmentList($item, $type);
1233                 $data['tag'] = self::createTagList($item);
1234
1235                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1236                         $data['location'] = self::createLocation($item);
1237                 }
1238
1239                 if (!empty($item['app'])) {
1240                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1241                 }
1242
1243                 $data = array_merge($data, $permission_block);
1244
1245                 return $data;
1246         }
1247
1248         /**
1249          * Creates an announce object entry
1250          *
1251          * @param array $item
1252          * @param array $data activity data
1253          *
1254          * @return array with activity data
1255          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1256          * @throws \ImagickException
1257          */
1258         private static function createAnnounce($item, $data)
1259         {
1260                 $announce = api_share_as_retweet($item);
1261                 if (empty($announce['plink'])) {
1262                         $data['type'] = 'Create';
1263                         $data['object'] = self::createNote($item);
1264                         return $data;
1265                 }
1266
1267                 // Fetch the original id of the object
1268                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1269                 if (!empty($activity)) {
1270                         $ldactivity = JsonLD::compact($activity);
1271                         $id = JsonLD::fetchElement($ldactivity, '@id');
1272                         if (!empty($id)) {
1273                                 $data['object'] = $id;
1274                                 return $data;
1275                         }
1276                 }
1277
1278                 $data['type'] = 'Create';
1279                 $data['object'] = self::createNote($item);
1280                 return $data;
1281         }
1282
1283         /**
1284          * Creates an activity id for a given contact id
1285          *
1286          * @param integer $cid Contact ID of target
1287          *
1288          * @return bool|string activity id
1289          */
1290         public static function activityIDFromContact($cid)
1291         {
1292                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1293                 if (!DBA::isResult($contact)) {
1294                         return false;
1295                 }
1296
1297                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1298                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1299                 return System::baseUrl() . '/activity/' . $uuid;
1300         }
1301
1302         /**
1303          * Transmits a contact suggestion to a given inbox
1304          *
1305          * @param integer $uid           User ID
1306          * @param string  $inbox         Target inbox
1307          * @param integer $suggestion_id Suggestion ID
1308          *
1309          * @return boolean was the transmission successful?
1310          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1311          */
1312         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1313         {
1314                 $owner = User::getOwnerDataById($uid);
1315
1316                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1317
1318                 $data = ['@context' => ActivityPub::CONTEXT,
1319                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1320                         'type' => 'Announce',
1321                         'actor' => $owner['url'],
1322                         'object' => $suggestion['url'],
1323                         'content' => $suggestion['note'],
1324                         'instrument' => self::getService(),
1325                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1326                         'cc' => []];
1327
1328                 $signed = LDSignature::sign($data, $owner);
1329
1330                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1331                 return HTTPSignature::transmit($signed, $inbox, $uid);
1332         }
1333
1334         /**
1335          * Transmits a profile relocation to a given inbox
1336          *
1337          * @param integer $uid   User ID
1338          * @param string  $inbox Target inbox
1339          *
1340          * @return boolean was the transmission successful?
1341          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1342          */
1343         public static function sendProfileRelocation($uid, $inbox)
1344         {
1345                 $owner = User::getOwnerDataById($uid);
1346
1347                 $data = ['@context' => ActivityPub::CONTEXT,
1348                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1349                         'type' => 'dfrn:relocate',
1350                         'actor' => $owner['url'],
1351                         'object' => $owner['url'],
1352                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1353                         'instrument' => self::getService(),
1354                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1355                         'cc' => []];
1356
1357                 $signed = LDSignature::sign($data, $owner);
1358
1359                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1360                 return HTTPSignature::transmit($signed, $inbox, $uid);
1361         }
1362
1363         /**
1364          * Transmits a profile deletion to a given inbox
1365          *
1366          * @param integer $uid   User ID
1367          * @param string  $inbox Target inbox
1368          *
1369          * @return boolean was the transmission successful?
1370          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1371          */
1372         public static function sendProfileDeletion($uid, $inbox)
1373         {
1374                 $owner = User::getOwnerDataById($uid);
1375
1376                 if (empty($owner)) {
1377                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1378                         return false;
1379                 }
1380
1381                 if (empty($owner['uprvkey'])) {
1382                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1383                         return false;
1384                 }
1385
1386                 $data = ['@context' => ActivityPub::CONTEXT,
1387                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1388                         'type' => 'Delete',
1389                         'actor' => $owner['url'],
1390                         'object' => $owner['url'],
1391                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1392                         'instrument' => self::getService(),
1393                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1394                         'cc' => []];
1395
1396                 $signed = LDSignature::sign($data, $owner);
1397
1398                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1399                 return HTTPSignature::transmit($signed, $inbox, $uid);
1400         }
1401
1402         /**
1403          * Transmits a profile change to a given inbox
1404          *
1405          * @param integer $uid   User ID
1406          * @param string  $inbox Target inbox
1407          *
1408          * @return boolean was the transmission successful?
1409          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1410          * @throws \ImagickException
1411          */
1412         public static function sendProfileUpdate($uid, $inbox)
1413         {
1414                 $owner = User::getOwnerDataById($uid);
1415                 $profile = APContact::getByURL($owner['url']);
1416
1417                 $data = ['@context' => ActivityPub::CONTEXT,
1418                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1419                         'type' => 'Update',
1420                         'actor' => $owner['url'],
1421                         'object' => self::getProfile($uid),
1422                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1423                         'instrument' => self::getService(),
1424                         'to' => [$profile['followers']],
1425                         'cc' => []];
1426
1427                 $signed = LDSignature::sign($data, $owner);
1428
1429                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1430                 return HTTPSignature::transmit($signed, $inbox, $uid);
1431         }
1432
1433         /**
1434          * Transmits a given activity to a target
1435          *
1436          * @param string  $activity Type name
1437          * @param string  $target   Target profile
1438          * @param integer $uid      User ID
1439          * @return bool
1440          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1441          * @throws \ImagickException
1442          * @throws \Exception
1443          */
1444         public static function sendActivity($activity, $target, $uid, $id = '')
1445         {
1446                 $profile = APContact::getByURL($target);
1447
1448                 $owner = User::getOwnerDataById($uid);
1449
1450                 if (empty($id)) {
1451                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1452                 }
1453
1454                 $data = ['@context' => ActivityPub::CONTEXT,
1455                         'id' => $id,
1456                         'type' => $activity,
1457                         'actor' => $owner['url'],
1458                         'object' => $profile['url'],
1459                         'instrument' => self::getService(),
1460                         'to' => [$profile['url']]];
1461
1462                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1463
1464                 $signed = LDSignature::sign($data, $owner);
1465                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1466         }
1467
1468         /**
1469          * Transmits a "follow object" activity to a target
1470          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1471          *
1472          * @param string  $object Object URL
1473          * @param string  $target Target profile
1474          * @param integer $uid    User ID
1475          * @return bool
1476          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1477          * @throws \ImagickException
1478          * @throws \Exception
1479          */
1480         public static function sendFollowObject($object, $target, $uid = 0)
1481         {
1482                 $profile = APContact::getByURL($target);
1483
1484                 if (empty($uid)) {
1485                         // Fetch the list of administrators
1486                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1487
1488                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1489                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1490                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1491                         $uid = $first_user['uid'];
1492                 }
1493
1494                 $condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1495                         'author-id' => Contact::getPublicIdByUserId($uid)];
1496                 if (Item::exists($condition)) {
1497                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1498                         return false;
1499                 }
1500
1501                 $owner = User::getOwnerDataById($uid);
1502
1503                 $data = ['@context' => ActivityPub::CONTEXT,
1504                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1505                         'type' => 'Follow',
1506                         'actor' => $owner['url'],
1507                         'object' => $object,
1508                         'instrument' => self::getService(),
1509                         'to' => [$profile['url']]];
1510
1511                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1512
1513                 $signed = LDSignature::sign($data, $owner);
1514                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1515         }
1516
1517         /**
1518          * Transmit a message that the contact request had been accepted
1519          *
1520          * @param string  $target Target profile
1521          * @param         $id
1522          * @param integer $uid    User ID
1523          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1524          * @throws \ImagickException
1525          */
1526         public static function sendContactAccept($target, $id, $uid)
1527         {
1528                 $profile = APContact::getByURL($target);
1529
1530                 $owner = User::getOwnerDataById($uid);
1531                 $data = ['@context' => ActivityPub::CONTEXT,
1532                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1533                         'type' => 'Accept',
1534                         'actor' => $owner['url'],
1535                         'object' => ['id' => $id, 'type' => 'Follow',
1536                                 'actor' => $profile['url'],
1537                                 'object' => $owner['url']],
1538                         'instrument' => self::getService(),
1539                         'to' => [$profile['url']]];
1540
1541                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1542
1543                 $signed = LDSignature::sign($data, $owner);
1544                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1545         }
1546
1547         /**
1548          * Reject a contact request or terminates the contact relation
1549          *
1550          * @param string  $target Target profile
1551          * @param         $id
1552          * @param integer $uid    User ID
1553          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1554          * @throws \ImagickException
1555          */
1556         public static function sendContactReject($target, $id, $uid)
1557         {
1558                 $profile = APContact::getByURL($target);
1559
1560                 $owner = User::getOwnerDataById($uid);
1561                 $data = ['@context' => ActivityPub::CONTEXT,
1562                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1563                         'type' => 'Reject',
1564                         'actor' => $owner['url'],
1565                         'object' => ['id' => $id, 'type' => 'Follow',
1566                                 'actor' => $profile['url'],
1567                                 'object' => $owner['url']],
1568                         'instrument' => self::getService(),
1569                         'to' => [$profile['url']]];
1570
1571                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1572
1573                 $signed = LDSignature::sign($data, $owner);
1574                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1575         }
1576
1577         /**
1578          * Transmits a message that we don't want to follow this contact anymore
1579          *
1580          * @param string  $target Target profile
1581          * @param integer $uid    User ID
1582          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1583          * @throws \ImagickException
1584          * @throws \Exception
1585          */
1586         public static function sendContactUndo($target, $cid, $uid)
1587         {
1588                 $profile = APContact::getByURL($target);
1589
1590                 $object_id = self::activityIDFromContact($cid);
1591                 if (empty($object_id)) {
1592                         return;
1593                 }
1594
1595                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1596
1597                 $owner = User::getOwnerDataById($uid);
1598                 $data = ['@context' => ActivityPub::CONTEXT,
1599                         'id' => $id,
1600                         'type' => 'Undo',
1601                         'actor' => $owner['url'],
1602                         'object' => ['id' => $object_id, 'type' => 'Follow',
1603                                 'actor' => $owner['url'],
1604                                 'object' => $profile['url']],
1605                         'instrument' => self::getService(),
1606                         'to' => [$profile['url']]];
1607
1608                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1609
1610                 $signed = LDSignature::sign($data, $owner);
1611                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1612         }
1613
1614         private static function prependMentions($body, array $permission_block)
1615         {
1616                 if (Config::get('system', 'disable_implicit_mentions')) {
1617                         return $body;
1618                 }
1619
1620                 $mentions = [];
1621
1622                 foreach ($permission_block['to'] as $profile_url) {
1623                         $profile = Contact::getDetailsByURL($profile_url);
1624                         if (!empty($profile['addr'])
1625                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1626                                 && !strstr($body, $profile['addr'])
1627                                 && !strstr($body, $profile_url)
1628                         ) {
1629                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1630                         }
1631                 }
1632
1633                 $mentions[] = $body;
1634
1635                 return implode(' ', $mentions);
1636         }
1637 }