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\Content\Text\BBCode;
  10 use Friendica\Content\Text\Plaintext;
  11 use Friendica\Core\Cache;
  12 use Friendica\Core\Config;
  13 use Friendica\Core\Logger;
  14 use Friendica\Core\Protocol;
  15 use Friendica\Core\System;
  16 use Friendica\Database\DBA;
  17 use Friendica\Model\APContact;
  18 use Friendica\Model\Contact;
  19 use Friendica\Model\Conversation;
  20 use Friendica\Model\Item;
  21 use Friendica\Model\Profile;
  22 use Friendica\Model\Photo;
  23 use Friendica\Model\Term;
  24 use Friendica\Model\User;
  25 use Friendica\Protocol\Activity;
  26 use Friendica\Protocol\ActivityPub;
  27 use Friendica\Util\DateTimeFormat;
  28 use Friendica\Util\HTTPSignature;
  29 use Friendica\Util\Images;
  30 use Friendica\Util\JsonLD;
  31 use Friendica\Util\LDSignature;
  32 use Friendica\Util\Map;
  33 use Friendica\Util\Network;
  34 use Friendica\Util\XML;
  35
  36 require_once 'include/api.php';
  37 require_once 'mod/share.php';
  38
  39 /**
  40  * @brief ActivityPub Transmitter Protocol class
  41  *
  42  * To-Do:
  43  * - Undo Announce
  44  */
  45 class Transmitter
  46 {
  47         /**
  48          * collects the lost of followers of the given owner
  49          *
  50          * @param array   $owner Owner array
  51          * @param integer $page  Page number
  52          *
  53          * @return array of owners
  54          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  55          */
  56         public static function getFollowers($owner, $page = null)
  57         {
  58                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  59                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  60                 $count = DBA::count('contact', $condition);
  61
  62                 $data = ['@context' => ActivityPub::CONTEXT];
  63                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  64                 $data['type'] = 'OrderedCollection';
  65                 $data['totalItems'] = $count;
  66
  67                 // When we hide our friends we will only show the pure number but don't allow more.
  68                 $profile = Profile::getByUID($owner['uid']);
  69                 if (!empty($profile['hide-friends'])) {
  70                         return $data;
  71                 }
  72
  73                 if (empty($page)) {
  74                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  75                 } else {
  76                         $data['type'] = 'OrderedCollectionPage';
  77                         $list = [];
  78
  79                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  80                         while ($contact = DBA::fetch($contacts)) {
  81                                 $list[] = $contact['url'];
  82                         }
  83
  84                         if (!empty($list)) {
  85                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  86                         }
  87
  88                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  89
  90                         $data['orderedItems'] = $list;
  91                 }
  92
  93                 return $data;
  94         }
  95
  96         /**
  97          * Create list of following contacts
  98          *
  99          * @param array   $owner Owner array
 100          * @param integer $page  Page numbe
 101          *
 102          * @return array of following contacts
 103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 104          */
 105         public static function getFollowing($owner, $page = null)
 106         {
 107                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 108                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 109                 $count = DBA::count('contact', $condition);
 110
 111                 $data = ['@context' => ActivityPub::CONTEXT];
 112                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 113                 $data['type'] = 'OrderedCollection';
 114                 $data['totalItems'] = $count;
 115
 116                 // When we hide our friends we will only show the pure number but don't allow more.
 117                 $profile = Profile::getByUID($owner['uid']);
 118                 if (!empty($profile['hide-friends'])) {
 119                         return $data;
 120                 }
 121
 122                 if (empty($page)) {
 123                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 124                 } else {
 125                         $data['type'] = 'OrderedCollectionPage';
 126                         $list = [];
 127
 128                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 129                         while ($contact = DBA::fetch($contacts)) {
 130                                 $list[] = $contact['url'];
 131                         }
 132
 133                         if (!empty($list)) {
 134                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 135                         }
 136
 137                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 138
 139                         $data['orderedItems'] = $list;
 140                 }
 141
 142                 return $data;
 143         }
 144
 145         /**
 146          * Public posts for the given owner
 147          *
 148          * @param array   $owner Owner array
 149          * @param integer $page  Page numbe
 150          *
 151          * @return array of posts
 152          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 153          * @throws \ImagickException
 154          */
 155         public static function getOutbox($owner, $page = null)
 156         {
 157                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 158
 159                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 160                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 161                         'deleted' => false, 'visible' => true, 'moderated' => false];
 162                 $count = DBA::count('item', $condition);
 163
 164                 $data = ['@context' => ActivityPub::CONTEXT];
 165                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 166                 $data['type'] = 'OrderedCollection';
 167                 $data['totalItems'] = $count;
 168
 169                 if (empty($page)) {
 170                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 171                 } else {
 172                         $data['type'] = 'OrderedCollectionPage';
 173                         $list = [];
 174
 175                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 176
 177                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 178                         while ($item = Item::fetch($items)) {
 179                                 $activity = self::createActivityFromItem($item['id'], true);
 180                                 // Only list "Create" activity objects here, no reshares
 181                                 if (is_array($activity['object']) && ($activity['type'] == 'Create')) {
 182                                         $list[] = $activity['object'];
 183                                 }
 184                         }
 185
 186                         if (!empty($list)) {
 187                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 188                         }
 189
 190                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 191
 192                         $data['orderedItems'] = $list;
 193                 }
 194
 195                 return $data;
 196         }
 197
 198         /**
 199          * Return the service array containing information the used software and it's url
 200          *
 201          * @return array with service data
 202          */
 203         private static function getService()
 204         {
 205                 return ['type' => 'Service',
 206                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 207                         'url' => BaseObject::getApp()->getBaseURL()];
 208         }
 209
 210         /**
 211          * Return the ActivityPub profile of the given user
 212          *
 213          * @param integer $uid User ID
 214          * @return array with profile data
 215          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 216          */
 217         public static function getProfile($uid)
 218         {
 219                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 220                         'account_removed' => false, 'verified' => true];
 221                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 222                 $user = DBA::selectFirst('user', $fields, $condition);
 223                 if (!DBA::isResult($user)) {
 224                         return [];
 225                 }
 226
 227                 $fields = ['locality', 'region', 'country-name'];
 228                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 229                 if (!DBA::isResult($profile)) {
 230                         return [];
 231                 }
 232
 233                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 234                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 235                 if (!DBA::isResult($contact)) {
 236                         return [];
 237                 }
 238
 239                 $data = ['@context' => ActivityPub::CONTEXT];
 240                 $data['id'] = $contact['url'];
 241                 $data['diaspora:guid'] = $user['guid'];
 242                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 243                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 244                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 245                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 246                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 247                 $data['preferredUsername'] = $user['nickname'];
 248                 $data['name'] = $contact['name'];
 249                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 250                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 251                 $data['summary'] = $contact['about'];
 252                 $data['url'] = $contact['url'];
 253                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 254                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 255                         'owner' => $contact['url'],
 256                         'publicKeyPem' => $user['pubkey']];
 257                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 258                 $data['icon'] = ['type' => 'Image',
 259                         'url' => $contact['photo']];
 260
 261                 $data['generator'] = self::getService();
 262
 263                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 264                 return $data;
 265         }
 266
 267         /**
 268          * @param string $username
 269          * @return array
 270          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 271          */
 272         public static function getDeletedUser($username)
 273         {
 274                 return [
 275                         '@context' => ActivityPub::CONTEXT,
 276                         'id' => System::baseUrl() . '/profile/' . $username,
 277                         'type' => 'Tombstone',
 278                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 279                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 280                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 281                 ];
 282         }
 283
 284         /**
 285          * Returns an array with permissions of a given item array
 286          *
 287          * @param array $item
 288          *
 289          * @return array with permissions
 290          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 291          * @throws \ImagickException
 292          */
 293         private static function fetchPermissionBlockFromConversation($item)
 294         {
 295                 if (empty($item['thr-parent'])) {
 296                         return [];
 297                 }
 298
 299                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 300                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 301                 if (!DBA::isResult($conversation)) {
 302                         return [];
 303                 }
 304
 305                 $activity = json_decode($conversation['source'], true);
 306
 307                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 308                 $profile = APContact::getByURL($actor);
 309
 310                 $item_profile = APContact::getByURL($item['author-link']);
 311                 $exclude[] = $item['author-link'];
 312
 313                 if ($item['gravity'] == GRAVITY_PARENT) {
 314                         $exclude[] = $item['owner-link'];
 315                 }
 316
 317                 $permissions['to'][] = $actor;
 318
 319                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 320                         if (empty($activity[$element])) {
 321                                 continue;
 322                         }
 323                         if (is_string($activity[$element])) {
 324                                 $activity[$element] = [$activity[$element]];
 325                         }
 326
 327                         foreach ($activity[$element] as $receiver) {
 328                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 329                                         $permissions[$element][] = $item_profile['followers'];
 330                                 } elseif (!in_array($receiver, $exclude)) {
 331                                         $permissions[$element][] = $receiver;
 332                                 }
 333                         }
 334                 }
 335                 return $permissions;
 336         }
 337
 338         /**
 339          * Creates an array of permissions from an item thread
 340          *
 341          * @param array   $item       Item array
 342          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 343          * @param integer $last_id    Last item id for adding receivers
 344          * @param boolean $forum_mode "true" means that we are sending content to a forum
 345          *
 346          * @return array with permission data
 347          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 348          * @throws \ImagickException
 349          */
 350         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 351         {
 352                 if ($last_id == 0) {
 353                         $last_id = $item['id'];
 354                 }
 355
 356                 $always_bcc = false;
 357
 358                 // Check if we should always deliver our stuff via BCC
 359                 if (!empty($item['uid'])) {
 360                         $profile = Profile::getByUID($item['uid']);
 361                         if (!empty($profile)) {
 362                                 $always_bcc = $profile['hide-friends'];
 363                         }
 364                 }
 365
 366                 if (Config::get('debug', 'total_ap_delivery')) {
 367                         // Will be activated in a later step
 368                         $networks = Protocol::FEDERATED;
 369                 } else {
 370                         // For now only send to these contacts:
 371                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 372                 }
 373
 374                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 375
 376                 if ($item['gravity'] == GRAVITY_PARENT) {
 377                         $actor_profile = APContact::getByURL($item['owner-link']);
 378                 } else {
 379                         $actor_profile = APContact::getByURL($item['author-link']);
 380                 }
 381
 382                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 383
 384                 // Directly mention the original author upon a quoted reshare.
 385                 // Else just ensure that the original author receives the reshare.
 386                 $announce = self::getAnnounceArray($item);
 387                 if (!empty($announce['comment'])) {
 388                         $data['to'][] = $announce['actor']['url'];
 389                 } elseif (!empty($announce)) {
 390                         $data['cc'][] = $announce['actor']['url'];
 391                 }
 392
 393                 if (!$item['private']) {
 394                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 395
 396                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 397
 398                         foreach ($terms as $term) {
 399                                 $profile = APContact::getByURL($term['url'], false);
 400                                 if (!empty($profile)) {
 401                                         $data['to'][] = $profile['url'];
 402                                 }
 403                         }
 404                 } else {
 405                         $receiver_list = Item::enumeratePermissions($item, true);
 406
 407                         foreach ($terms as $term) {
 408                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 409                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 410                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 411                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 412                                                 continue;
 413                                         }
 414
 415                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 416                                                 $data['to'][] = $profile['url'];
 417                                         }
 418                                 }
 419                         }
 420
 421                         foreach ($receiver_list as $receiver) {
 422                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 423                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 424                                         continue;
 425                                 }
 426
 427                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 428                                         if ($contact['hidden'] || $always_bcc) {
 429                                                 $data['bcc'][] = $profile['url'];
 430                                         } else {
 431                                                 $data['cc'][] = $profile['url'];
 432                                         }
 433                                 }
 434                         }
 435                 }
 436
 437                 if (!empty($item['parent'])) {
 438                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 439                         while ($parent = Item::fetch($parents)) {
 440                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 441                                         $profile = APContact::getByURL($parent['owner-link'], false);
 442                                         if (!empty($profile)) {
 443                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 444                                                         // Comments to forums are directed to the forum
 445                                                         // But comments to forums aren't directed to the followers collection
 446                                                         if ($profile['type'] == 'Group') {
 447                                                                 $data['to'][] = $profile['url'];
 448                                                         } else {
 449                                                                 $data['cc'][] = $profile['url'];
 450                                                                 if (!$item['private'] && !empty($actor_profile['followers'])) {
 451                                                                         $data['cc'][] = $actor_profile['followers'];
 452                                                                 }
 453                                                         }
 454                                                 } else {
 455                                                         // Public thread parent post always are directed to the followers
 456                                                         if (!$item['private'] && !$forum_mode) {
 457                                                                 $data['cc'][] = $actor_profile['followers'];
 458                                                         }
 459                                                 }
 460                                         }
 461                                 }
 462
 463                                 // Don't include data from future posts
 464                                 if ($parent['id'] >= $last_id) {
 465                                         continue;
 466                                 }
 467
 468                                 $profile = APContact::getByURL($parent['author-link'], false);
 469                                 if (!empty($profile)) {
 470                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 471                                                 $data['to'][] = $profile['url'];
 472                                         } else {
 473                                                 $data['cc'][] = $profile['url'];
 474                                         }
 475                                 }
 476                         }
 477                         DBA::close($parents);
 478                 }
 479
 480                 $data['to'] = array_unique($data['to']);
 481                 $data['cc'] = array_unique($data['cc']);
 482                 $data['bcc'] = array_unique($data['bcc']);
 483
 484                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 485                         unset($data['to'][$key]);
 486                 }
 487
 488                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 489                         unset($data['cc'][$key]);
 490                 }
 491
 492                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 493                         unset($data['bcc'][$key]);
 494                 }
 495
 496                 foreach ($data['to'] as $to) {
 497                         if (($key = array_search($to, $data['cc'])) !== false) {
 498                                 unset($data['cc'][$key]);
 499                         }
 500
 501                         if (($key = array_search($to, $data['bcc'])) !== false) {
 502                                 unset($data['bcc'][$key]);
 503                         }
 504                 }
 505
 506                 foreach ($data['cc'] as $cc) {
 507                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 508                                 unset($data['bcc'][$key]);
 509                         }
 510                 }
 511
 512                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 513
 514                 if (!$blindcopy) {
 515                         unset($receivers['bcc']);
 516                 }
 517
 518                 return $receivers;
 519         }
 520
 521         /**
 522          * Check if an inbox is archived
 523          *
 524          * @param string $url Inbox url
 525          *
 526          * @return boolean "true" if inbox is archived
 527          */
 528         private static function archivedInbox($url)
 529         {
 530                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 531         }
 532
 533         /**
 534          * Fetches a list of inboxes of followers of a given user
 535          *
 536          * @param integer $uid      User ID
 537          * @param boolean $personal fetch personal inboxes
 538          *
 539          * @return array of follower inboxes
 540          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 541          * @throws \ImagickException
 542          */
 543         public static function fetchTargetInboxesforUser($uid, $personal = false)
 544         {
 545                 $inboxes = [];
 546
 547                 if (Config::get('debug', 'total_ap_delivery')) {
 548                         // Will be activated in a later step
 549                         $networks = Protocol::FEDERATED;
 550                 } else {
 551                         // For now only send to these contacts:
 552                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 553                 }
 554
 555                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 556
 557                 if (!empty($uid)) {
 558                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 559                 }
 560
 561                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 562                 while ($contact = DBA::fetch($contacts)) {
 563                         if (Contact::isLocal($contact['url'])) {
 564                                 continue;
 565                         }
 566
 567                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 568                                 continue;
 569                         }
 570
 571                         if (Network::isUrlBlocked($contact['url'])) {
 572                                 continue;
 573                         }
 574
 575                         $profile = APContact::getByURL($contact['url'], false);
 576                         if (!empty($profile)) {
 577                                 if (empty($profile['sharedinbox']) || $personal) {
 578                                         $target = $profile['inbox'];
 579                                 } else {
 580                                         $target = $profile['sharedinbox'];
 581                                 }
 582                                 if (!self::archivedInbox($target)) {
 583                                         $inboxes[$target] = $target;
 584                                 }
 585                         }
 586                 }
 587                 DBA::close($contacts);
 588
 589                 return $inboxes;
 590         }
 591
 592         /**
 593          * Fetches an array of inboxes for the given item and user
 594          *
 595          * @param array   $item       Item array
 596          * @param integer $uid        User ID
 597          * @param boolean $personal   fetch personal inboxes
 598          * @param integer $last_id    Last item id for adding receivers
 599          * @param boolean $forum_mode "true" means that we are sending content to a forum
 600          * @return array with inboxes
 601          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 602          * @throws \ImagickException
 603          */
 604         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 605         {
 606                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 607                 if (empty($permissions)) {
 608                         return [];
 609                 }
 610
 611                 $inboxes = [];
 612
 613                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 614                         $item_profile = APContact::getByURL($item['author-link'], false);
 615                 } else {
 616                         $item_profile = APContact::getByURL($item['owner-link'], false);
 617                 }
 618
 619                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 620                         if (empty($permissions[$element])) {
 621                                 continue;
 622                         }
 623
 624                         $blindcopy = in_array($element, ['bto', 'bcc']);
 625
 626                         foreach ($permissions[$element] as $receiver) {
 627                                 if (Network::isUrlBlocked($receiver)) {
 628                                         continue;
 629                                 }
 630
 631                                 if ($receiver == $item_profile['followers']) {
 632                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 633                                 } else {
 634                                         if (Contact::isLocal($receiver)) {
 635                                                 continue;
 636                                         }
 637
 638                                         $profile = APContact::getByURL($receiver, false);
 639                                         if (!empty($profile)) {
 640                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 641                                                         $target = $profile['inbox'];
 642                                                 } else {
 643                                                         $target = $profile['sharedinbox'];
 644                                                 }
 645                                                 if (!self::archivedInbox($target)) {
 646                                                         $inboxes[$target] = $target;
 647                                                 }
 648                                         }
 649                                 }
 650                         }
 651                 }
 652
 653                 return $inboxes;
 654         }
 655
 656         /**
 657          * Creates an array in the structure of the item table for a given mail id
 658          *
 659          * @param integer $mail_id
 660          *
 661          * @return array
 662          * @throws \Exception
 663          */
 664         public static function ItemArrayFromMail($mail_id)
 665         {
 666                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 667                 if (!DBA::isResult($mail)) {
 668                         return [];
 669                 }
 670
 671                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 672
 673                 // Making the post more compatible for Mastodon by:
 674                 // - Making it a note and not an article (no title)
 675                 // - Moving the title into the "summary" field that is used as a "content warning"
 676                 $mail['body'] = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
 677                 $mail['title'] = '';
 678
 679                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 680                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 681                 $mail['allow_gid'] = '';
 682                 $mail['deny_cid'] = '';
 683                 $mail['deny_gid'] = '';
 684                 $mail['private'] = true;
 685                 $mail['deleted'] = false;
 686                 $mail['edited'] = $mail['created'];
 687                 $mail['plink'] = $mail['uri'];
 688                 $mail['thr-parent'] = $reply['uri'];
 689                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 690
 691                 $mail['event-type'] = '';
 692                 $mail['attach'] = '';
 693
 694                 $mail['parent'] = 0;
 695
 696                 return $mail;
 697         }
 698
 699         /**
 700          * Creates an activity array for a given mail id
 701          *
 702          * @param integer $mail_id
 703          * @param boolean $object_mode Is the activity item is used inside another object?
 704          *
 705          * @return array of activity
 706          * @throws \Exception
 707          */
 708         public static function createActivityFromMail($mail_id, $object_mode = false)
 709         {
 710                 $mail = self::ItemArrayFromMail($mail_id);
 711                 $object = self::createNote($mail);
 712
 713                 if (!$object_mode) {
 714                         $data = ['@context' => ActivityPub::CONTEXT];
 715                 } else {
 716                         $data = [];
 717                 }
 718
 719                 $data['id'] = $mail['uri'] . '#Create';
 720                 $data['type'] = 'Create';
 721                 $data['actor'] = $mail['author-link'];
 722                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 723                 $data['instrument'] = self::getService();
 724                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 725
 726                 if (empty($data['to']) && !empty($data['cc'])) {
 727                         $data['to'] = $data['cc'];
 728                 }
 729
 730                 if (empty($data['to']) && !empty($data['bcc'])) {
 731                         $data['to'] = $data['bcc'];
 732                 }
 733
 734                 unset($data['cc']);
 735                 unset($data['bcc']);
 736
 737                 $object['to'] = $data['to'];
 738                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => '']];
 739
 740                 unset($object['cc']);
 741                 unset($object['bcc']);
 742
 743                 $data['directMessage'] = true;
 744
 745                 $data['object'] = $object;
 746
 747                 $owner = User::getOwnerDataById($mail['uid']);
 748
 749                 if (!$object_mode && !empty($owner)) {
 750                         return LDSignature::sign($data, $owner);
 751                 } else {
 752                         return $data;
 753                 }
 754         }
 755
 756         /**
 757          * Returns the activity type of a given item
 758          *
 759          * @param array $item
 760          *
 761          * @return string with activity type
 762          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 763          * @throws \ImagickException
 764          */
 765         private static function getTypeOfItem($item)
 766         {
 767                 $reshared = false;
 768
 769                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 770                 if (strpos($item['body'], "[share") === 0) {
 771                         $announce = self::getAnnounceArray($item);
 772                         $reshared = !empty($announce);
 773                 }
 774
 775                 if ($reshared) {
 776                         $type = 'Announce';
 777                 } elseif ($item['verb'] == Activity::POST) {
 778                         if ($item['created'] == $item['edited']) {
 779                                 $type = 'Create';
 780                         } else {
 781                                 $type = 'Update';
 782                         }
 783                 } elseif ($item['verb'] == Activity::LIKE) {
 784                         $type = 'Like';
 785                 } elseif ($item['verb'] == Activity::DISLIKE) {
 786                         $type = 'Dislike';
 787                 } elseif ($item['verb'] == Activity::ATTEND) {
 788                         $type = 'Accept';
 789                 } elseif ($item['verb'] == Activity::ATTENDNO) {
 790                         $type = 'Reject';
 791                 } elseif ($item['verb'] == Activity::ATTENDMAYBE) {
 792                         $type = 'TentativeAccept';
 793                 } elseif ($item['verb'] == Activity::FOLLOW) {
 794                         $type = 'Follow';
 795                 } elseif ($item['verb'] == Activity::TAG) {
 796                         $type = 'Add';
 797                 } else {
 798                         $type = '';
 799                 }
 800
 801                 return $type;
 802         }
 803
 804         /**
 805          * Creates the activity or fetches it from the cache
 806          *
 807          * @param integer $item_id
 808          * @param boolean $force Force new cache entry
 809          *
 810          * @return array with the activity
 811          * @throws \Exception
 812          */
 813         public static function createCachedActivityFromItem($item_id, $force = false)
 814         {
 815                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 816
 817                 if (!$force) {
 818                         $data = Cache::get($cachekey);
 819                         if (!is_null($data)) {
 820                                 return $data;
 821                         }
 822                 }
 823
 824                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 825
 826                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 827                 return $data;
 828         }
 829
 830         /**
 831          * Creates an activity array for a given item id
 832          *
 833          * @param integer $item_id
 834          * @param boolean $object_mode Is the activity item is used inside another object?
 835          *
 836          * @return array of activity
 837          * @throws \Exception
 838          */
 839         public static function createActivityFromItem($item_id, $object_mode = false)
 840         {
 841                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 842
 843                 if (!DBA::isResult($item)) {
 844                         return false;
 845                 }
 846
 847                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 848                         $owner = User::getOwnerDataById($item['uid']);
 849                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 850                                 $type = 'Announce';
 851
 852                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 853                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 854                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 855                         }
 856                 }
 857
 858                 if (empty($type)) {
 859                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 860                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 861                         if (DBA::isResult($conversation)) {
 862                                 $data = json_decode($conversation['source'], true);
 863                                 if (!empty($data)) {
 864                                         return $data;
 865                                 }
 866                         }
 867
 868                         $type = self::getTypeOfItem($item);
 869                 }
 870
 871                 if (!$object_mode) {
 872                         $data = ['@context' => ActivityPub::CONTEXT];
 873
 874                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 875                                 $type = 'Undo';
 876                         } elseif ($item['deleted']) {
 877                                 $type = 'Delete';
 878                         }
 879                 } else {
 880                         $data = [];
 881                 }
 882
 883                 $data['id'] = $item['uri'] . '#' . $type;
 884                 $data['type'] = $type;
 885
 886                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 887                         $data['actor'] = $item['author-link'];
 888                 } else {
 889                         $data['actor'] = $item['owner-link'];
 890                 }
 891
 892                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 893
 894                 $data['instrument'] = self::getService();
 895
 896                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 897
 898                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 899                         $data['object'] = self::createNote($item);
 900                 } elseif ($data['type'] == 'Add') {
 901                         $data = self::createAddTag($item, $data);
 902                 } elseif ($data['type'] == 'Announce') {
 903                         $data = self::createAnnounce($item, $data);
 904                 } elseif ($data['type'] == 'Follow') {
 905                         $data['object'] = $item['parent-uri'];
 906                 } elseif ($data['type'] == 'Undo') {
 907                         $data['object'] = self::createActivityFromItem($item_id, true);
 908                 } else {
 909                         $data['diaspora:guid'] = $item['guid'];
 910                         if (!empty($item['signed_text'])) {
 911                                 $data['diaspora:like'] = $item['signed_text'];
 912                         }
 913                         $data['object'] = $item['thr-parent'];
 914                 }
 915
 916                 if (!empty($item['contact-uid'])) {
 917                         $uid = $item['contact-uid'];
 918                 } else {
 919                         $uid = $item['uid'];
 920                 }
 921
 922                 $owner = User::getOwnerDataById($uid);
 923
 924                 if (!$object_mode && !empty($owner)) {
 925                         return LDSignature::sign($data, $owner);
 926                 } else {
 927                         return $data;
 928                 }
 929
 930                 /// @todo Create "conversation" entry
 931         }
 932
 933         /**
 934          * Creates a location entry for a given item array
 935          *
 936          * @param array $item
 937          *
 938          * @return array with location array
 939          */
 940         private static function createLocation($item)
 941         {
 942                 $location = ['type' => 'Place'];
 943
 944                 if (!empty($item['location'])) {
 945                         $location['name'] = $item['location'];
 946                 }
 947
 948                 $coord = [];
 949
 950                 if (empty($item['coord'])) {
 951                         $coord = Map::getCoordinates($item['location']);
 952                 } else {
 953                         $coords = explode(' ', $item['coord']);
 954                         if (count($coords) == 2) {
 955                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 956                         }
 957                 }
 958
 959                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 960                         $location['latitude'] = $coord['lat'];
 961                         $location['longitude'] = $coord['lon'];
 962                 }
 963
 964                 return $location;
 965         }
 966
 967         /**
 968          * Returns a tag array for a given item array
 969          *
 970          * @param array $item
 971          *
 972          * @return array of tags
 973          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 974          */
 975         private static function createTagList($item)
 976         {
 977                 $tags = [];
 978
 979                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 980                 foreach ($terms as $term) {
 981                         if ($term['type'] == Term::HASHTAG) {
 982                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 983                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 984                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 985                                 $contact = Contact::getDetailsByURL($term['url']);
 986                                 if (!empty($contact['addr'])) {
 987                                         $mention = '@' . $contact['addr'];
 988                                 } else {
 989                                         $mention = '@' . $term['url'];
 990                                 }
 991
 992                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 993                         }
 994                 }
 995
 996                 $announce = self::getAnnounceArray($item);
 997                 // Mention the original author upon commented reshares
 998                 if (!empty($announce['comment'])) {
 999                         $tags[] = ['type' => 'Mention', 'href' => $announce['actor']['url'], 'name' => '@' . $announce['actor']['addr']];
1000                 }
1001
1002                 return $tags;
1003         }
1004
1005         /**
1006          * Adds attachment data to the JSON document
1007          *
1008          * @param array  $item Data of the item that is to be posted
1009          * @param string $type Object type
1010          *
1011          * @return array with attachment data
1012          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1013          */
1014         private static function createAttachmentList($item, $type)
1015         {
1016                 $attachments = [];
1017
1018                 // Currently deactivated, since it creates side effects on Mastodon and Pleroma.
1019                 // It will be reactivated, once this cleared.
1020                 /*
1021                 $attach_data = BBCode::getAttachmentData($item['body']);
1022                 if (!empty($attach_data['url'])) {
1023                         $attachment = ['type' => 'Page',
1024                                 'mediaType' => 'text/html',
1025                                 'url' => $attach_data['url']];
1026
1027                         if (!empty($attach_data['title'])) {
1028                                 $attachment['name'] = $attach_data['title'];
1029                         }
1030
1031                         if (!empty($attach_data['description'])) {
1032                                 $attachment['summary'] = $attach_data['description'];
1033                         }
1034
1035                         if (!empty($attach_data['image'])) {
1036                                 $imgdata = Images::getInfoFromURLCached($attach_data['image']);
1037                                 if ($imgdata) {
1038                                         $attachment['icon'] = ['type' => 'Image',
1039                                                 'mediaType' => $imgdata['mime'],
1040                                                 'width' => $imgdata[0],
1041                                                 'height' => $imgdata[1],
1042                                                 'url' => $attach_data['image']];
1043                                 }
1044                         }
1045
1046                         $attachments[] = $attachment;
1047                 }
1048                 */
1049                 $arr = explode('[/attach],', $item['attach']);
1050                 if (count($arr)) {
1051                         foreach ($arr as $r) {
1052                                 $matches = false;
1053                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1054                                 if ($cnt) {
1055                                         $attributes = ['type' => 'Document',
1056                                                         'mediaType' => $matches[3],
1057                                                         'url' => $matches[1],
1058                                                         'name' => null];
1059
1060                                         if (trim($matches[4]) != '') {
1061                                                 $attributes['name'] = trim($matches[4]);
1062                                         }
1063
1064                                         $attachments[] = $attributes;
1065                                 }
1066                         }
1067                 }
1068
1069                 if ($type != 'Note') {
1070                         return $attachments;
1071                 }
1072
1073                 // Simplify image codes
1074                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1075
1076                 // Grab all pictures without alternative descriptions and create attachments out of them
1077                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1078                         foreach ($pictures[1] as $picture) {
1079                                 $imgdata = Images::getInfoFromURLCached($picture);
1080                                 if ($imgdata) {
1081                                         $attachments[] = ['type' => 'Document',
1082                                                 'mediaType' => $imgdata['mime'],
1083                                                 'url' => $picture,
1084                                                 'name' => null];
1085                                 }
1086                         }
1087                 }
1088
1089                 // Grab all pictures with alternative description and create attachments out of them
1090                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
1091                         foreach ($pictures as $picture) {
1092                                 $imgdata = Images::getInfoFromURLCached($picture[1]);
1093                                 if ($imgdata) {
1094                                         $attachments[] = ['type' => 'Document',
1095                                                 'mediaType' => $imgdata['mime'],
1096                                                 'url' => $picture[1],
1097                                                 'name' => $picture[2]];
1098                                 }
1099                         }
1100                 }
1101
1102                 return $attachments;
1103         }
1104
1105         /**
1106          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
1107          *
1108          * @param array $match Matching values for the callback
1109          * @return string Replaced mention
1110          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1111          */
1112         private static function mentionCallback($match)
1113         {
1114                 if (empty($match[1])) {
1115                         return '';
1116                 }
1117
1118                 $data = Contact::getDetailsByURL($match[1]);
1119                 if (empty($data['nick'])) {
1120                         return $match[0];
1121                 }
1122
1123                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1124         }
1125
1126         /**
1127          * Remove image elements since they are added as attachment
1128          *
1129          * @param string $body
1130          *
1131          * @return string with removed images
1132          */
1133         private static function removePictures($body)
1134         {
1135                 // Simplify image codes
1136                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1137                 $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
1138
1139                 // Now remove local links
1140                 $body = preg_replace_callback(
1141                         '/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi',
1142                         function ($match) {
1143                                 // We remove the link when it is a link to a local photo page
1144                                 if (Photo::isLocalPage($match[1])) {
1145                                         return '';
1146                                 }
1147                                 // otherwise we just return the link
1148                                 return '[url]' . $match[1] . '[/url]';
1149                         },
1150                         $body
1151                 );
1152
1153                 // Remove all pictures
1154                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '', $body);
1155
1156                 return $body;
1157         }
1158
1159         /**
1160          * Fetches the "context" value for a givem item array from the "conversation" table
1161          *
1162          * @param array $item
1163          *
1164          * @return string with context url
1165          * @throws \Exception
1166          */
1167         private static function fetchContextURLForItem($item)
1168         {
1169                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1170                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1171                         $context_uri = $conversation['conversation-href'];
1172                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1173                         $context_uri = $conversation['conversation-uri'];
1174                 } else {
1175                         $context_uri = $item['parent-uri'] . '#context';
1176                 }
1177                 return $context_uri;
1178         }
1179
1180         /**
1181          * Returns if the post contains sensitive content ("nsfw")
1182          *
1183          * @param integer $item_id
1184          *
1185          * @return boolean
1186          * @throws \Exception
1187          */
1188         private static function isSensitive($item_id)
1189         {
1190                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
1191                 return DBA::exists('term', $condition);
1192         }
1193
1194         /**
1195          * Creates event data
1196          *
1197          * @param array $item
1198          *
1199          * @return array with the event data
1200          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1201          */
1202         public static function createEvent($item)
1203         {
1204                 $event = [];
1205                 $event['name'] = $item['event-summary'];
1206                 $event['content'] = BBCode::convert($item['event-desc'], false, 9);
1207                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1208
1209                 if (!$item['event-nofinish']) {
1210                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1211                 }
1212
1213                 if (!empty($item['event-location'])) {
1214                         $item['location'] = $item['event-location'];
1215                         $event['location'] = self::createLocation($item);
1216                 }
1217
1218                 return $event;
1219         }
1220
1221         /**
1222          * Creates a note/article object array
1223          *
1224          * @param array $item
1225          *
1226          * @return array with the object data
1227          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1228          * @throws \ImagickException
1229          */
1230         public static function createNote($item)
1231         {
1232                 if (empty($item)) {
1233                         return [];
1234                 }
1235
1236                 if ($item['event-type'] == 'event') {
1237                         $type = 'Event';
1238                 } elseif (!empty($item['title'])) {
1239                         $type = 'Article';
1240                 } else {
1241                         $type = 'Note';
1242                 }
1243
1244                 if ($item['deleted']) {
1245                         $type = 'Tombstone';
1246                 }
1247
1248                 $data = [];
1249                 $data['id'] = $item['uri'];
1250                 $data['type'] = $type;
1251
1252                 if ($item['deleted']) {
1253                         return $data;
1254                 }
1255
1256                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1257
1258                 if ($item['uri'] != $item['thr-parent']) {
1259                         $data['inReplyTo'] = $item['thr-parent'];
1260                 } else {
1261                         $data['inReplyTo'] = null;
1262                 }
1263
1264                 $data['diaspora:guid'] = $item['guid'];
1265                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1266
1267                 if ($item['created'] != $item['edited']) {
1268                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1269                 }
1270
1271                 $data['url'] = $item['plink'];
1272                 $data['attributedTo'] = $item['author-link'];
1273                 $data['sensitive'] = self::isSensitive($item['id']);
1274                 $data['context'] = self::fetchContextURLForItem($item);
1275
1276                 if (!empty($item['title'])) {
1277                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1278                 }
1279
1280                 $permission_block = self::createPermissionBlockForItem($item, false);
1281
1282                 $body = $item['body'];
1283
1284                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1285                         $body = self::prependMentions($body, $permission_block);
1286                 }
1287
1288                 if ($type == 'Note') {
1289                         $body = self::removePictures($body);
1290                 } elseif (($type == 'Article') && empty($data['summary'])) {
1291                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1292                 }
1293
1294                 if ($type == 'Event') {
1295                         $data = array_merge($data, self::createEvent($item));
1296                 } else {
1297                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1298                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1299
1300                         $data['content'] = BBCode::convert($body, false, 9);
1301                 }
1302
1303                 $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1304                 $richbody = preg_replace_callback($regexp, ['self', 'mentionCallback'], $item['body']);
1305                 $richbody = BBCode::removeAttachment($richbody);
1306
1307                 $data['contentMap']['text/html'] = BBCode::convert($richbody, false);
1308                 $data['contentMap']['text/markdown'] = BBCode::toMarkdown($item["body"]);
1309
1310                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1311
1312                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1313                         $data['diaspora:comment'] = $item['signed_text'];
1314                 }
1315
1316                 $data['attachment'] = self::createAttachmentList($item, $type);
1317                 $data['tag'] = self::createTagList($item);
1318
1319                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1320                         $data['location'] = self::createLocation($item);
1321                 }
1322
1323                 if (!empty($item['app'])) {
1324                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1325                 }
1326
1327                 $data = array_merge($data, $permission_block);
1328
1329                 return $data;
1330         }
1331
1332         /**
1333          * Creates an an "add tag" entry
1334          *
1335          * @param array $item
1336          * @param array $data activity data
1337          *
1338          * @return array with activity data for adding tags
1339          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1340          * @throws \ImagickException
1341          */
1342         private static function createAddTag($item, $data)
1343         {
1344                 $object = XML::parseString($item['object'], false);
1345                 $target = XML::parseString($item["target"], false);
1346
1347                 $data['diaspora:guid'] = $item['guid'];
1348                 $data['actor'] = $item['author-link'];
1349                 $data['target'] = (string)$target->id;
1350                 $data['summary'] = BBCode::toPlaintext($item['body']);
1351                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1352
1353                 return $data;
1354         }
1355
1356         /**
1357          * Creates an announce object entry
1358          *
1359          * @param array $item
1360          * @param array $data activity data
1361          *
1362          * @return array with activity data
1363          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1364          * @throws \ImagickException
1365          */
1366         private static function createAnnounce($item, $data)
1367         {
1368                 $orig_body = $item['body'];
1369                 $announce = self::getAnnounceArray($item);
1370                 if (empty($announce)) {
1371                         $data['type'] = 'Create';
1372                         $data['object'] = self::createNote($item);
1373                         return $data;
1374                 }
1375
1376                 if (empty($announce['comment'])) {
1377                         // Pure announce, without a quote
1378                         $data['type'] = 'Announce';
1379                         $data['object'] = $announce['object']['uri'];
1380                         return $data;
1381                 }
1382
1383                 // Quote
1384                 $data['type'] = 'Create';
1385                 $item['body'] = $announce['comment'] . "\n" . $announce['object']['plink'];
1386                 $data['object'] = self::createNote($item);
1387
1388                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1389                 $data['object']['attachment'][] = self::createNote($announce['object']);
1390
1391                 $data['object']['source']['content'] = $orig_body;
1392                 return $data;
1393         }
1394
1395         /**
1396          * Return announce related data if the item is an annunce
1397          *
1398          * @param array $item
1399          *
1400          * @return array
1401          */
1402         public static function getAnnounceArray($item)
1403         {
1404                 if (!preg_match("/(.*?)\[share(.*?)\]\s?.*?\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
1405                         return [];
1406                 }
1407
1408                 $attributes = $matches[2];
1409                 $comment = $matches[1];
1410
1411                 preg_match("/guid='(.*?)'/ism", $attributes, $matches);
1412                 if (empty($matches[1])) {
1413                         preg_match('/guid="(.*?)"/ism', $attributes, $matches);
1414                 }
1415
1416                 if (empty($matches[1])) {
1417                         return [];
1418                 }
1419
1420                 $reshared_item = Item::selectFirst([], ['guid' => $matches[1]]);
1421                 if (!DBA::isResult($reshared_item)) {
1422                         return [];
1423                 }
1424
1425                 if (!in_array($reshared_item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1426                         return [];
1427                 }
1428
1429                 $profile = APContact::getByURL($reshared_item['author-link'], false);
1430                 if (empty($profile)) {
1431                         return [];
1432                 }
1433
1434                 return ['object' => $reshared_item, 'actor' => $profile, 'comment' => trim($comment)];
1435         }
1436
1437         /**
1438          * Creates an activity id for a given contact id
1439          *
1440          * @param integer $cid Contact ID of target
1441          *
1442          * @return bool|string activity id
1443          */
1444         public static function activityIDFromContact($cid)
1445         {
1446                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1447                 if (!DBA::isResult($contact)) {
1448                         return false;
1449                 }
1450
1451                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1452                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1453                 return System::baseUrl() . '/activity/' . $uuid;
1454         }
1455
1456         /**
1457          * Transmits a contact suggestion to a given inbox
1458          *
1459          * @param integer $uid           User ID
1460          * @param string  $inbox         Target inbox
1461          * @param integer $suggestion_id Suggestion ID
1462          *
1463          * @return boolean was the transmission successful?
1464          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1465          */
1466         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1467         {
1468                 $owner = User::getOwnerDataById($uid);
1469
1470                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1471
1472                 $data = ['@context' => ActivityPub::CONTEXT,
1473                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1474                         'type' => 'Announce',
1475                         'actor' => $owner['url'],
1476                         'object' => $suggestion['url'],
1477                         'content' => $suggestion['note'],
1478                         'instrument' => self::getService(),
1479                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1480                         'cc' => []];
1481
1482                 $signed = LDSignature::sign($data, $owner);
1483
1484                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1485                 return HTTPSignature::transmit($signed, $inbox, $uid);
1486         }
1487
1488         /**
1489          * Transmits a profile relocation to a given inbox
1490          *
1491          * @param integer $uid   User ID
1492          * @param string  $inbox Target inbox
1493          *
1494          * @return boolean was the transmission successful?
1495          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1496          */
1497         public static function sendProfileRelocation($uid, $inbox)
1498         {
1499                 $owner = User::getOwnerDataById($uid);
1500
1501                 $data = ['@context' => ActivityPub::CONTEXT,
1502                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1503                         'type' => 'dfrn:relocate',
1504                         'actor' => $owner['url'],
1505                         'object' => $owner['url'],
1506                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1507                         'instrument' => self::getService(),
1508                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1509                         'cc' => []];
1510
1511                 $signed = LDSignature::sign($data, $owner);
1512
1513                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1514                 return HTTPSignature::transmit($signed, $inbox, $uid);
1515         }
1516
1517         /**
1518          * Transmits a profile deletion to a given inbox
1519          *
1520          * @param integer $uid   User ID
1521          * @param string  $inbox Target inbox
1522          *
1523          * @return boolean was the transmission successful?
1524          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1525          */
1526         public static function sendProfileDeletion($uid, $inbox)
1527         {
1528                 $owner = User::getOwnerDataById($uid);
1529
1530                 if (empty($owner)) {
1531                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1532                         return false;
1533                 }
1534
1535                 if (empty($owner['uprvkey'])) {
1536                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1537                         return false;
1538                 }
1539
1540                 $data = ['@context' => ActivityPub::CONTEXT,
1541                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1542                         'type' => 'Delete',
1543                         'actor' => $owner['url'],
1544                         'object' => $owner['url'],
1545                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1546                         'instrument' => self::getService(),
1547                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1548                         'cc' => []];
1549
1550                 $signed = LDSignature::sign($data, $owner);
1551
1552                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1553                 return HTTPSignature::transmit($signed, $inbox, $uid);
1554         }
1555
1556         /**
1557          * Transmits a profile change to a given inbox
1558          *
1559          * @param integer $uid   User ID
1560          * @param string  $inbox Target inbox
1561          *
1562          * @return boolean was the transmission successful?
1563          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1564          * @throws \ImagickException
1565          */
1566         public static function sendProfileUpdate($uid, $inbox)
1567         {
1568                 $owner = User::getOwnerDataById($uid);
1569                 $profile = APContact::getByURL($owner['url']);
1570
1571                 $data = ['@context' => ActivityPub::CONTEXT,
1572                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1573                         'type' => 'Update',
1574                         'actor' => $owner['url'],
1575                         'object' => self::getProfile($uid),
1576                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1577                         'instrument' => self::getService(),
1578                         'to' => [$profile['followers']],
1579                         'cc' => []];
1580
1581                 $signed = LDSignature::sign($data, $owner);
1582
1583                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1584                 return HTTPSignature::transmit($signed, $inbox, $uid);
1585         }
1586
1587         /**
1588          * Transmits a given activity to a target
1589          *
1590          * @param string  $activity Type name
1591          * @param string  $target   Target profile
1592          * @param integer $uid      User ID
1593          * @return bool
1594          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1595          * @throws \ImagickException
1596          * @throws \Exception
1597          */
1598         public static function sendActivity($activity, $target, $uid, $id = '')
1599         {
1600                 $profile = APContact::getByURL($target);
1601                 if (empty($profile['inbox'])) {
1602                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1603                         return;
1604                 }
1605
1606                 $owner = User::getOwnerDataById($uid);
1607
1608                 if (empty($id)) {
1609                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1610                 }
1611
1612                 $data = ['@context' => ActivityPub::CONTEXT,
1613                         'id' => $id,
1614                         'type' => $activity,
1615                         'actor' => $owner['url'],
1616                         'object' => $profile['url'],
1617                         'instrument' => self::getService(),
1618                         'to' => [$profile['url']]];
1619
1620                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1621
1622                 $signed = LDSignature::sign($data, $owner);
1623                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1624         }
1625
1626         /**
1627          * Transmits a "follow object" activity to a target
1628          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1629          *
1630          * @param string  $object Object URL
1631          * @param string  $target Target profile
1632          * @param integer $uid    User ID
1633          * @return bool
1634          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1635          * @throws \ImagickException
1636          * @throws \Exception
1637          */
1638         public static function sendFollowObject($object, $target, $uid = 0)
1639         {
1640                 $profile = APContact::getByURL($target);
1641                 if (empty($profile['inbox'])) {
1642                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1643                         return;
1644                 }
1645
1646                 if (empty($uid)) {
1647                         // Fetch the list of administrators
1648                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1649
1650                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1651                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1652                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1653                         $uid = $first_user['uid'];
1654                 }
1655
1656                 $condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1657                         'author-id' => Contact::getPublicIdByUserId($uid)];
1658                 if (Item::exists($condition)) {
1659                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1660                         return false;
1661                 }
1662
1663                 $owner = User::getOwnerDataById($uid);
1664
1665                 $data = ['@context' => ActivityPub::CONTEXT,
1666                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1667                         'type' => 'Follow',
1668                         'actor' => $owner['url'],
1669                         'object' => $object,
1670                         'instrument' => self::getService(),
1671                         'to' => [$profile['url']]];
1672
1673                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1674
1675                 $signed = LDSignature::sign($data, $owner);
1676                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1677         }
1678
1679         /**
1680          * Transmit a message that the contact request had been accepted
1681          *
1682          * @param string  $target Target profile
1683          * @param         $id
1684          * @param integer $uid    User ID
1685          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1686          * @throws \ImagickException
1687          */
1688         public static function sendContactAccept($target, $id, $uid)
1689         {
1690                 $profile = APContact::getByURL($target);
1691                 if (empty($profile['inbox'])) {
1692                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1693                         return;
1694                 }
1695
1696                 $owner = User::getOwnerDataById($uid);
1697                 $data = ['@context' => ActivityPub::CONTEXT,
1698                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1699                         'type' => 'Accept',
1700                         'actor' => $owner['url'],
1701                         'object' => [
1702                                 'id' => (string)$id,
1703                                 'type' => 'Follow',
1704                                 'actor' => $profile['url'],
1705                                 'object' => $owner['url']
1706                         ],
1707                         'instrument' => self::getService(),
1708                         'to' => [$profile['url']]];
1709
1710                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1711
1712                 $signed = LDSignature::sign($data, $owner);
1713                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1714         }
1715
1716         /**
1717          * Reject a contact request or terminates the contact relation
1718          *
1719          * @param string  $target Target profile
1720          * @param         $id
1721          * @param integer $uid    User ID
1722          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1723          * @throws \ImagickException
1724          */
1725         public static function sendContactReject($target, $id, $uid)
1726         {
1727                 $profile = APContact::getByURL($target);
1728                 if (empty($profile['inbox'])) {
1729                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1730                         return;
1731                 }
1732
1733                 $owner = User::getOwnerDataById($uid);
1734                 $data = ['@context' => ActivityPub::CONTEXT,
1735                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1736                         'type' => 'Reject',
1737                         'actor' => $owner['url'],
1738                         'object' => [
1739                                 'id' => (string)$id,
1740                                 'type' => 'Follow',
1741                                 'actor' => $profile['url'],
1742                                 'object' => $owner['url']
1743                         ],
1744                         'instrument' => self::getService(),
1745                         'to' => [$profile['url']]];
1746
1747                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1748
1749                 $signed = LDSignature::sign($data, $owner);
1750                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1751         }
1752
1753         /**
1754          * Transmits a message that we don't want to follow this contact anymore
1755          *
1756          * @param string  $target Target profile
1757          * @param integer $uid    User ID
1758          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1759          * @throws \ImagickException
1760          * @throws \Exception
1761          */
1762         public static function sendContactUndo($target, $cid, $uid)
1763         {
1764                 $profile = APContact::getByURL($target);
1765                 if (empty($profile['inbox'])) {
1766                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1767                         return;
1768                 }
1769
1770                 $object_id = self::activityIDFromContact($cid);
1771                 if (empty($object_id)) {
1772                         return;
1773                 }
1774
1775                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1776
1777                 $owner = User::getOwnerDataById($uid);
1778                 $data = ['@context' => ActivityPub::CONTEXT,
1779                         'id' => $id,
1780                         'type' => 'Undo',
1781                         'actor' => $owner['url'],
1782                         'object' => ['id' => $object_id, 'type' => 'Follow',
1783                                 'actor' => $owner['url'],
1784                                 'object' => $profile['url']],
1785                         'instrument' => self::getService(),
1786                         'to' => [$profile['url']]];
1787
1788                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1789
1790                 $signed = LDSignature::sign($data, $owner);
1791                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1792         }
1793
1794         private static function prependMentions($body, array $permission_block)
1795         {
1796                 if (Config::get('system', 'disable_implicit_mentions')) {
1797                         return $body;
1798                 }
1799
1800                 $mentions = [];
1801
1802                 foreach ($permission_block['to'] as $profile_url) {
1803                         $profile = Contact::getDetailsByURL($profile_url);
1804                         if (!empty($profile['addr'])
1805                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1806                                 && !strstr($body, $profile['addr'])
1807                                 && !strstr($body, $profile_url)
1808                         ) {
1809                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1810                         }
1811                 }
1812
1813                 $mentions[] = $body;
1814
1815                 return implode(' ', $mentions);
1816         }
1817 }