src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Core\System;
  10 use Friendica\Util\HTTPSignature;
  11 use Friendica\Core\Protocol;
  12 use Friendica\Model\Conversation;
  13 use Friendica\Model\Contact;
  14 use Friendica\Model\APContact;
  15 use Friendica\Model\Item;
  16 use Friendica\Model\Term;
  17 use Friendica\Model\User;
  18 use Friendica\Util\DateTimeFormat;
  19 use Friendica\Content\Text\BBCode;
  20 use Friendica\Util\JsonLD;
  21 use Friendica\Util\LDSignature;
  22 use Friendica\Model\Profile;
  23 use Friendica\Core\Config;
  24 use Friendica\Object\Image;
  25 use Friendica\Protocol\ActivityPub;
  26 use Friendica\Protocol\Diaspora;
  27 use Friendica\Core\Cache;
  28 use Friendica\Util\Map;
  29
  30 require_once 'include/api.php';
  31
  32 /**
  33  * @brief ActivityPub Transmitter Protocol class
  34  *
  35  * To-Do:
  36  *
  37  * Missing object types:
  38  * - Event
  39  *
  40  * Complicated object types:
  41  * - Undo Announce
  42  */
  43 class Transmitter
  44 {
  45         /**
  46          * collects the lost of followers of the given owner
  47          *
  48          * @param array $owner Owner array
  49          * @param integer $page Page number
  50          *
  51          * @return array of owners
  52          */
  53         public static function getFollowers($owner, $page = null)
  54         {
  55                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  56                         'self' => false, '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 $page Page numbe
  97          *
  98          * @return array of following contacts
  99          */
 100         public static function getFollowing($owner, $page = null)
 101         {
 102                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 103                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 104                 $count = DBA::count('contact', $condition);
 105
 106                 $data = ['@context' => ActivityPub::CONTEXT];
 107                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 108                 $data['type'] = 'OrderedCollection';
 109                 $data['totalItems'] = $count;
 110
 111                 // When we hide our friends we will only show the pure number but don't allow more.
 112                 $profile = Profile::getByUID($owner['uid']);
 113                 if (!empty($profile['hide-friends'])) {
 114                         return $data;
 115                 }
 116
 117                 if (empty($page)) {
 118                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 119                 } else {
 120                         $list = [];
 121
 122                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 123                         while ($contact = DBA::fetch($contacts)) {
 124                                 $list[] = $contact['url'];
 125                         }
 126
 127                         if (!empty($list)) {
 128                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 129                         }
 130
 131                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 132
 133                         $data['orderedItems'] = $list;
 134                 }
 135
 136                 return $data;
 137         }
 138
 139         /**
 140          * Public posts for the given owner
 141          *
 142          * @param array $owner Owner array
 143          * @param integer $page Page numbe
 144          *
 145          * @return array of posts
 146          */
 147         public static function getOutbox($owner, $page = null)
 148         {
 149                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 150
 151                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 152                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 153                         'deleted' => false, 'visible' => true];
 154                 $count = DBA::count('item', $condition);
 155
 156                 $data = ['@context' => ActivityPub::CONTEXT];
 157                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 158                 $data['type'] = 'OrderedCollection';
 159                 $data['totalItems'] = $count;
 160
 161                 if (empty($page)) {
 162                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 163                 } else {
 164                         $list = [];
 165
 166                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 167
 168                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 169                         while ($item = Item::fetch($items)) {
 170                                 $object = self::createObjectFromItemID($item['id']);
 171                                 unset($object['@context']);
 172                                 $list[] = $object;
 173                         }
 174
 175                         if (!empty($list)) {
 176                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 177                         }
 178
 179                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 180
 181                         $data['orderedItems'] = $list;
 182                 }
 183
 184                 return $data;
 185         }
 186
 187         /**
 188          * Return the ActivityPub profile of the given user
 189          *
 190          * @param integer $uid User ID
 191          * @return array with profile data
 192          */
 193         public static function getProfile($uid)
 194         {
 195                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 196                         'account_removed' => false, 'verified' => true];
 197                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 198                 $user = DBA::selectFirst('user', $fields, $condition);
 199                 if (!DBA::isResult($user)) {
 200                         return [];
 201                 }
 202
 203                 $fields = ['locality', 'region', 'country-name'];
 204                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 205                 if (!DBA::isResult($profile)) {
 206                         return [];
 207                 }
 208
 209                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 210                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 211                 if (!DBA::isResult($contact)) {
 212                         return [];
 213                 }
 214
 215                 // On old installations and never changed contacts this might not be filled
 216                 if (empty($contact['avatar'])) {
 217                         $contact['avatar'] = $contact['photo'];
 218                 }
 219
 220                 $data = ['@context' => ActivityPub::CONTEXT];
 221                 $data['id'] = $contact['url'];
 222                 $data['diaspora:guid'] = $user['guid'];
 223                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 224                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 225                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 226                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 227                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 228                 $data['preferredUsername'] = $user['nickname'];
 229                 $data['name'] = $contact['name'];
 230                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 231                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 232                 $data['summary'] = $contact['about'];
 233                 $data['url'] = $contact['url'];
 234                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 235                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 236                         'owner' => $contact['url'],
 237                         'publicKeyPem' => $user['pubkey']];
 238                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 239                 $data['icon'] = ['type' => 'Image',
 240                         'url' => $contact['avatar']];
 241
 242                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 243                 return $data;
 244         }
 245
 246         /**
 247          * Returns an array with permissions of a given item array
 248          *
 249          * @param array $item
 250          *
 251          * @return array with permissions
 252          */
 253         private static function fetchPermissionBlockFromConversation($item)
 254         {
 255                 if (empty($item['thr-parent'])) {
 256                         return [];
 257                 }
 258
 259                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 260                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 261                 if (!DBA::isResult($conversation)) {
 262                         return [];
 263                 }
 264
 265                 $activity = json_decode($conversation['source'], true);
 266
 267                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 268                 $profile = APContact::getByURL($actor);
 269
 270                 $item_profile = APContact::getByURL($item['author-link']);
 271                 $exclude[] = $item['author-link'];
 272
 273                 if ($item['gravity'] == GRAVITY_PARENT) {
 274                         $exclude[] = $item['owner-link'];
 275                 }
 276
 277                 $permissions['to'][] = $actor;
 278
 279                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 280                         if (empty($activity[$element])) {
 281                                 continue;
 282                         }
 283                         if (is_string($activity[$element])) {
 284                                 $activity[$element] = [$activity[$element]];
 285                         }
 286
 287                         foreach ($activity[$element] as $receiver) {
 288                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 289                                         $permissions[$element][] = $item_profile['followers'];
 290                                 }
 291                                 if (!in_array($receiver, $exclude)) {
 292                                         $permissions[$element][] = $receiver;
 293                                 }
 294                         }
 295                 }
 296                 return $permissions;
 297         }
 298
 299         /**
 300          * Creates an array of permissions from an item thread
 301          *
 302          * @param array $item
 303          * @param boolean $blindcopy
 304          *
 305          * @return array with permission data
 306          */
 307         private static function createPermissionBlockForItem($item, $blindcopy)
 308         {
 309                 // Will be activated in a later step
 310                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 311
 312                 // For now only send to these contacts:
 313                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 314
 315                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 316
 317                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 318
 319                 $actor_profile = APContact::getByURL($item['author-link']);
 320
 321                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 322
 323                 if (!$item['private']) {
 324                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 325                         if (!empty($actor_profile['followers'])) {
 326                                 $data['cc'][] = $actor_profile['followers'];
 327                         }
 328
 329                         foreach ($terms as $term) {
 330                                 $profile = APContact::getByURL($term['url'], false);
 331                                 if (!empty($profile)) {
 332                                         $data['to'][] = $profile['url'];
 333                                 }
 334                         }
 335                 } else {
 336                         $receiver_list = Item::enumeratePermissions($item);
 337
 338                         $mentioned = [];
 339
 340                         foreach ($terms as $term) {
 341                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 342                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 343                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 344                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 345                                                 $data['to'][] = $profile['url'];
 346                                         }
 347                                 }
 348                         }
 349
 350                         foreach ($receiver_list as $receiver) {
 351                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => $networks]);
 352                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 353                                         // BCC is currently deactivated, due to Pleroma and Mastodon not reacting like expected
 354                                         // $data['bcc'][] = $profile['url'];
 355                                         $data['cc'][] = $profile['url'];
 356                                 }
 357                         }
 358                 }
 359
 360                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 361                 while ($parent = Item::fetch($parents)) {
 362                         // Don't include data from future posts
 363                         if ($parent['id'] >= $item['id']) {
 364                                 continue;
 365                         }
 366
 367                         $profile = APContact::getByURL($parent['author-link'], false);
 368                         if (!empty($profile)) {
 369                                 if ($parent['uri'] == $item['thr-parent']) {
 370                                         $data['to'][] = $profile['url'];
 371                                 } else {
 372                                         $data['cc'][] = $profile['url'];
 373                                 }
 374                         }
 375
 376                         if ($item['gravity'] != GRAVITY_PARENT) {
 377                                 continue;
 378                         }
 379
 380                         $profile = APContact::getByURL($parent['owner-link'], false);
 381                         if (!empty($profile)) {
 382                                 $data['cc'][] = $profile['url'];
 383                         }
 384                 }
 385                 DBA::close($parents);
 386
 387                 $data['to'] = array_unique($data['to']);
 388                 $data['cc'] = array_unique($data['cc']);
 389                 $data['bcc'] = array_unique($data['bcc']);
 390
 391                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 392                         unset($data['to'][$key]);
 393                 }
 394
 395                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 396                         unset($data['cc'][$key]);
 397                 }
 398
 399                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 400                         unset($data['bcc'][$key]);
 401                 }
 402
 403                 foreach ($data['to'] as $to) {
 404                         if (($key = array_search($to, $data['cc'])) !== false) {
 405                                 unset($data['cc'][$key]);
 406                         }
 407
 408                         if (($key = array_search($to, $data['bcc'])) !== false) {
 409                                 unset($data['bcc'][$key]);
 410                         }
 411                 }
 412
 413                 foreach ($data['cc'] as $cc) {
 414                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 415                                 unset($data['bcc'][$key]);
 416                         }
 417                 }
 418
 419                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 420
 421                 if (!$blindcopy) {
 422                         unset($receivers['bcc']);
 423                 }
 424
 425                 return $receivers;
 426         }
 427
 428         /**
 429          * Fetches a list of inboxes of followers of a given user
 430          *
 431          * @param integer $uid User ID
 432          * @param boolean $personal fetch personal inboxes
 433          *
 434          * @return array of follower inboxes
 435          */
 436         public static function fetchTargetInboxesforUser($uid, $personal = false)
 437         {
 438                 $inboxes = [];
 439
 440                 // Will be activated in a later step
 441                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 442
 443                 // For now only send to these contacts:
 444                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 445
 446                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 447
 448                 if (!empty($uid)) {
 449                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 450                 }
 451
 452                 $contacts = DBA::select('contact', ['url'], $condition);
 453                 while ($contact = DBA::fetch($contacts)) {
 454                         $profile = APContact::getByURL($contact['url'], false);
 455                         if (!empty($profile)) {
 456                                 if (empty($profile['sharedinbox']) || $personal) {
 457                                         $target = $profile['inbox'];
 458                                 } else {
 459                                         $target = $profile['sharedinbox'];
 460                                 }
 461                                 $inboxes[$target] = $target;
 462                         }
 463                 }
 464                 DBA::close($contacts);
 465
 466                 return $inboxes;
 467         }
 468
 469         /**
 470          * Fetches an array of inboxes for the given item and user
 471          *
 472          * @param array $item
 473          * @param integer $uid User ID
 474          * @param boolean $personal fetch personal inboxes
 475          *
 476          * @return array with inboxes
 477          */
 478         public static function fetchTargetInboxes($item, $uid, $personal = false)
 479         {
 480                 $permissions = self::createPermissionBlockForItem($item, true);
 481                 if (empty($permissions)) {
 482                         return [];
 483                 }
 484
 485                 $inboxes = [];
 486
 487                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 488                         $item_profile = APContact::getByURL($item['author-link'], false);
 489                 } else {
 490                         $item_profile = APContact::getByURL($item['owner-link'], false);
 491                 }
 492
 493                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 494                         if (empty($permissions[$element])) {
 495                                 continue;
 496                         }
 497
 498                         $blindcopy = in_array($element, ['bto', 'bcc']);
 499
 500                         foreach ($permissions[$element] as $receiver) {
 501                                 if ($receiver == $item_profile['followers']) {
 502                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 503                                 } else {
 504                                         $profile = APContact::getByURL($receiver, false);
 505                                         if (!empty($profile)) {
 506                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 507                                                         $target = $profile['inbox'];
 508                                                 } else {
 509                                                         $target = $profile['sharedinbox'];
 510                                                 }
 511                                                 $inboxes[$target] = $target;
 512                                         }
 513                                 }
 514                         }
 515                 }
 516
 517                 return $inboxes;
 518         }
 519
 520         /**
 521          * Returns the activity type of a given item
 522          *
 523          * @param array $item
 524          *
 525          * @return string with activity type
 526          */
 527         private static function getTypeOfItem($item)
 528         {
 529                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 530                         $type = 'Announce';
 531                 } elseif ($item['verb'] == ACTIVITY_POST) {
 532                         if ($item['created'] == $item['edited']) {
 533                                 $type = 'Create';
 534                         } else {
 535                                 $type = 'Update';
 536                         }
 537                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 538                         $type = 'Like';
 539                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 540                         $type = 'Dislike';
 541                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 542                         $type = 'Accept';
 543                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 544                         $type = 'Reject';
 545                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 546                         $type = 'TentativeAccept';
 547                 } else {
 548                         $type = '';
 549                 }
 550
 551                 return $type;
 552         }
 553
 554         /**
 555          * Creates the activity or fetches it from the cache
 556          *
 557          * @param integer $item_id
 558          *
 559          * @return array with the activity
 560          */
 561         public static function createCachedActivityFromItem($item_id)
 562         {
 563                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 564                 $data = Cache::get($cachekey);
 565                 if (!is_null($data)) {
 566                         return $data;
 567                 }
 568
 569                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 570
 571                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 572                 return $data;
 573         }
 574
 575         /**
 576          * Creates an activity array for a given item id
 577          *
 578          * @param integer $item_id
 579          * @param boolean $object_mode Is the activity item is used inside another object?
 580          *
 581          * @return array of activity
 582          */
 583         public static function createActivityFromItem($item_id, $object_mode = false)
 584         {
 585                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 586
 587                 if (!DBA::isResult($item)) {
 588                         return false;
 589                 }
 590
 591                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 592                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 593                 if (DBA::isResult($conversation)) {
 594                         $data = json_decode($conversation['source']);
 595                         if (!empty($data)) {
 596                                 return $data;
 597                         }
 598                 }
 599
 600                 $type = self::getTypeOfItem($item);
 601
 602                 if (!$object_mode) {
 603                         $data = ['@context' => ActivityPub::CONTEXT];
 604
 605                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 606                                 $type = 'Undo';
 607                         } elseif ($item['deleted']) {
 608                                 $type = 'Delete';
 609                         }
 610                 } else {
 611                         $data = [];
 612                 }
 613
 614                 $data['id'] = $item['uri'] . '#' . $type;
 615                 $data['type'] = $type;
 616                 $data['actor'] = $item['owner-link'];
 617
 618                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 619
 620                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 621
 622                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 623
 624                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 625                         $data['object'] = self::createNote($item);
 626                 } elseif ($data['type'] == 'Announce') {
 627                         $data['object'] = self::createAnnounce($item);
 628                 } elseif ($data['type'] == 'Undo') {
 629                         $data['object'] = self::createActivityFromItem($item_id, true);
 630                 } else {
 631                         $data['diaspora:guid'] = $item['guid'];
 632                         $data['object'] = $item['thr-parent'];
 633                 }
 634
 635                 $owner = User::getOwnerDataById($item['uid']);
 636
 637                 if (!$object_mode) {
 638                         return LDSignature::sign($data, $owner);
 639                 } else {
 640                         return $data;
 641                 }
 642
 643                 /// @todo Create "conversation" entry
 644         }
 645
 646         /**
 647          * Creates an object array for a given item id
 648          *
 649          * @param integer $item_id
 650          *
 651          * @return array with the object data
 652          */
 653         public static function createObjectFromItemID($item_id)
 654         {
 655                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 656
 657                 if (!DBA::isResult($item)) {
 658                         return false;
 659                 }
 660
 661                 $data = ['@context' => ActivityPub::CONTEXT];
 662                 $data = array_merge($data, self::createNote($item));
 663
 664                 return $data;
 665         }
 666
 667         /**
 668          * Creates a location entry for a given item array
 669          *
 670          * @param array $item
 671          *
 672          * @return array with location array
 673          */
 674         private static function createLocation($item)
 675         {
 676                 $location = ['type' => 'Place'];
 677
 678                 if (!empty($item['location'])) {
 679                         $location['name'] = $item['location'];
 680                 }
 681
 682                 $coord = [];
 683
 684                 if (empty($item['coord'])) {
 685                         $coord = Map::getCoordinates($item['location']);
 686                 } else {
 687                         $coords = explode(' ', $item['coord']);
 688                         if (count($coords) == 2) {
 689                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 690                         }
 691                 }
 692
 693                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 694                         $location['latitude'] = $coord['lat'];
 695                         $location['longitude'] = $coord['lon'];
 696                 }
 697
 698                 return $location;
 699         }
 700
 701         /**
 702          * Returns a tag array for a given item array
 703          *
 704          * @param array $item
 705          *
 706          * @return array of tags
 707          */
 708         private static function createTagList($item)
 709         {
 710                 $tags = [];
 711
 712                 $terms = Term::tagArrayFromItemId($item['id']);
 713                 foreach ($terms as $term) {
 714                         if ($term['type'] == TERM_HASHTAG) {
 715                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 716                         } elseif ($term['type'] == TERM_MENTION) {
 717                                 $contact = Contact::getDetailsByURL($term['url']);
 718                                 if (!empty($contact['addr'])) {
 719                                         $mention = '@' . $contact['addr'];
 720                                 } else {
 721                                         $mention = '@' . $term['url'];
 722                                 }
 723
 724                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 725                         }
 726                 }
 727                 return $tags;
 728         }
 729
 730         /**
 731          * Adds attachment data to the JSON document
 732          *
 733          * @param array $item Data of the item that is to be posted
 734          * @param text $type Object type
 735          *
 736          * @return array with attachment data
 737          */
 738         private static function createAttachmentList($item, $type)
 739         {
 740                 $attachments = [];
 741
 742                 $arr = explode('[/attach],', $item['attach']);
 743                 if (count($arr)) {
 744                         foreach ($arr as $r) {
 745                                 $matches = false;
 746                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 747                                 if ($cnt) {
 748                                         $attributes = ['type' => 'Document',
 749                                                         'mediaType' => $matches[3],
 750                                                         'url' => $matches[1],
 751                                                         'name' => null];
 752
 753                                         if (trim($matches[4]) != '') {
 754                                                 $attributes['name'] = trim($matches[4]);
 755                                         }
 756
 757                                         $attachments[] = $attributes;
 758                                 }
 759                         }
 760                 }
 761
 762                 if ($type != 'Note') {
 763                         return $attachments;
 764                 }
 765
 766                 // Simplify image codes
 767                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 768
 769                 // Grab all pictures and create attachments out of them
 770                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 771                         foreach ($pictures[1] as $picture) {
 772                                 $imgdata = Image::getInfoFromURL($picture);
 773                                 if ($imgdata) {
 774                                         $attachments[] = ['type' => 'Document',
 775                                                 'mediaType' => $imgdata['mime'],
 776                                                 'url' => $picture,
 777                                                 'name' => null];
 778                                 }
 779                         }
 780                 }
 781
 782                 return $attachments;
 783         }
 784
 785         /**
 786          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 787          *
 788          * @param array $match Matching values for the callback
 789          * @return string Replaced mention
 790          */
 791         private static function mentionCallback($match)
 792         {
 793                 if (empty($match[1])) {
 794                         return;
 795                 }
 796
 797                 $data = Contact::getDetailsByURL($match[1]);
 798                 if (empty($data) || empty($data['nick'])) {
 799                         return;
 800                 }
 801
 802                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 803         }
 804
 805         /**
 806          * Remove image elements and replaces them with links to the image
 807          *
 808          * @param string $body
 809          *
 810          * @return string with replaced elements
 811          */
 812         private static function removePictures($body)
 813         {
 814                 // Simplify image codes
 815                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 816
 817                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 818                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 819
 820                 return $body;
 821         }
 822
 823         /**
 824          * Fetches the "context" value for a givem item array from the "conversation" table
 825          *
 826          * @param array $item
 827          *
 828          * @return string with context url
 829          */
 830         private static function fetchContextURLForItem($item)
 831         {
 832                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 833                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 834                         $context_uri = $conversation['conversation-href'];
 835                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 836                         $context_uri = $conversation['conversation-uri'];
 837                 } else {
 838                         $context_uri = $item['parent-uri'] . '#context';
 839                 }
 840                 return $context_uri;
 841         }
 842
 843         /**
 844          * Returns if the post contains sensitive content ("nsfw")
 845          *
 846          * @param integer $item_id
 847          *
 848          * @return boolean
 849          */
 850         private static function isSensitive($item_id)
 851         {
 852                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 853                 return DBA::exists('term', $condition);
 854         }
 855
 856         /**
 857          * Creates a note/article object array
 858          *
 859          * @param array $item
 860          *
 861          * @return array with the object data
 862          */
 863         public static function createNote($item)
 864         {
 865                 if (!empty($item['title'])) {
 866                         $type = 'Article';
 867                 } else {
 868                         $type = 'Note';
 869                 }
 870
 871                 if ($item['deleted']) {
 872                         $type = 'Tombstone';
 873                 }
 874
 875                 $data = [];
 876                 $data['id'] = $item['uri'];
 877                 $data['type'] = $type;
 878
 879                 if ($item['deleted']) {
 880                         return $data;
 881                 }
 882
 883                 $data['summary'] = null; // Ignore by now
 884
 885                 if ($item['uri'] != $item['thr-parent']) {
 886                         $data['inReplyTo'] = $item['thr-parent'];
 887                 } else {
 888                         $data['inReplyTo'] = null;
 889                 }
 890
 891                 $data['diaspora:guid'] = $item['guid'];
 892                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 893
 894                 if ($item['created'] != $item['edited']) {
 895                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 896                 }
 897
 898                 $data['url'] = $item['plink'];
 899                 $data['attributedTo'] = $item['author-link'];
 900                 $data['sensitive'] = self::isSensitive($item['id']);
 901                 $data['context'] = self::fetchContextURLForItem($item);
 902
 903                 if (!empty($item['title'])) {
 904                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 905                 }
 906
 907                 $body = $item['body'];
 908
 909                 if ($type == 'Note') {
 910                         $body = self::removePictures($body);
 911                 }
 912
 913                 $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 914                 $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 915
 916                 $data['content'] = BBCode::convert($body, false, 7);
 917                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 918
 919                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 920                         $data['diaspora:comment'] = $item['signed_text'];
 921                 }
 922
 923                 $data['attachment'] = self::createAttachmentList($item, $type);
 924                 $data['tag'] = self::createTagList($item);
 925
 926                 if (!empty($item['coord']) || !empty($item['location'])) {
 927                         $data['location'] = self::createLocation($item);
 928                 }
 929
 930                 if (!empty($item['app'])) {
 931                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 932                 }
 933
 934                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 935
 936                 return $data;
 937         }
 938
 939         /**
 940          * Creates an announce object entry
 941          *
 942          * @param array $item
 943          *
 944          * @return string with announced object url
 945          */
 946         public static function createAnnounce($item)
 947         {
 948                 $announce = api_share_as_retweet($item);
 949                 if (empty($announce['plink'])) {
 950                         return self::createNote($item);
 951                 }
 952
 953                 return $announce['plink'];
 954         }
 955
 956         /**
 957          * Transmits a contact suggestion to a given inbox
 958          *
 959          * @param integer $uid User ID
 960          * @param string $inbox Target inbox
 961          * @param integer $suggestion_id Suggestion ID
 962          *
 963          * @return boolean was the transmission successful?
 964          */
 965         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 966         {
 967                 $owner = User::getOwnerDataById($uid);
 968                 $profile = APContact::getByURL($owner['url']);
 969
 970                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 971
 972                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 973                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 974                         'type' => 'Announce',
 975                         'actor' => $owner['url'],
 976                         'object' => $suggestion['url'],
 977                         'content' => $suggestion['note'],
 978                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 979                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 980                         'cc' => []];
 981
 982                 $signed = LDSignature::sign($data, $owner);
 983
 984                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 985                 return HTTPSignature::transmit($signed, $inbox, $uid);
 986         }
 987
 988         /**
 989          * Transmits a profile deletion to a given inbox
 990          *
 991          * @param integer $uid User ID
 992          * @param string $inbox Target inbox
 993          *
 994          * @return boolean was the transmission successful?
 995          */
 996         public static function sendProfileDeletion($uid, $inbox)
 997         {
 998                 $owner = User::getOwnerDataById($uid);
 999                 $profile = APContact::getByURL($owner['url']);
1000
1001                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1002                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1003                         'type' => 'Delete',
1004                         'actor' => $owner['url'],
1005                         'object' => $owner['url'],
1006                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1007                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1008                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1009                         'cc' => []];
1010
1011                 $signed = LDSignature::sign($data, $owner);
1012
1013                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1014                 return HTTPSignature::transmit($signed, $inbox, $uid);
1015         }
1016
1017         /**
1018          * Transmits a profile change to a given inbox
1019          *
1020          * @param integer $uid User ID
1021          * @param string $inbox Target inbox
1022          *
1023          * @return boolean was the transmission successful?
1024          */
1025         public static function sendProfileUpdate($uid, $inbox)
1026         {
1027                 $owner = User::getOwnerDataById($uid);
1028                 $profile = APContact::getByURL($owner['url']);
1029
1030                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1031                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1032                         'type' => 'Update',
1033                         'actor' => $owner['url'],
1034                         'object' => self::getProfile($uid),
1035                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1036                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1037                         'to' => [$profile['followers']],
1038                         'cc' => []];
1039
1040                 $signed = LDSignature::sign($data, $owner);
1041
1042                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1043                 return HTTPSignature::transmit($signed, $inbox, $uid);
1044         }
1045
1046         /**
1047          * Transmits a given activity to a target
1048          *
1049          * @param array $activity
1050          * @param string $target Target profile
1051          * @param integer $uid User ID
1052          */
1053         public static function sendActivity($activity, $target, $uid)
1054         {
1055                 $profile = APContact::getByURL($target);
1056
1057                 $owner = User::getOwnerDataById($uid);
1058
1059                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1060                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1061                         'type' => $activity,
1062                         'actor' => $owner['url'],
1063                         'object' => $profile['url'],
1064                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1065                         'to' => $profile['url']];
1066
1067                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
1068
1069                 $signed = LDSignature::sign($data, $owner);
1070                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1071         }
1072
1073         /**
1074          * Transmit a message that the contact request had been accepted
1075          *
1076          * @param string $target Target profile
1077          * @param $id
1078          * @param integer $uid User ID
1079          */
1080         public static function sendContactAccept($target, $id, $uid)
1081         {
1082                 $profile = APContact::getByURL($target);
1083
1084                 $owner = User::getOwnerDataById($uid);
1085                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1086                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1087                         'type' => 'Accept',
1088                         'actor' => $owner['url'],
1089                         'object' => ['id' => $id, 'type' => 'Follow',
1090                                 'actor' => $profile['url'],
1091                                 'object' => $owner['url']],
1092                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1093                         'to' => $profile['url']];
1094
1095                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1096
1097                 $signed = LDSignature::sign($data, $owner);
1098                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1099         }
1100
1101         /**
1102          * Reject a contact request or terminates the contact relation
1103          *
1104          * @param string $target Target profile
1105          * @param $id
1106          * @param integer $uid User ID
1107          */
1108         public static function sendContactReject($target, $id, $uid)
1109         {
1110                 $profile = APContact::getByURL($target);
1111
1112                 $owner = User::getOwnerDataById($uid);
1113                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1114                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1115                         'type' => 'Reject',
1116                         'actor' => $owner['url'],
1117                         'object' => ['id' => $id, 'type' => 'Follow',
1118                                 'actor' => $profile['url'],
1119                                 'object' => $owner['url']],
1120                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1121                         'to' => $profile['url']];
1122
1123                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1124
1125                 $signed = LDSignature::sign($data, $owner);
1126                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1127         }
1128
1129         /**
1130          * Transmits a message that we don't want to follow this contact anymore
1131          *
1132          * @param string $target Target profile
1133          * @param integer $uid User ID
1134          */
1135         public static function sendContactUndo($target, $uid)
1136         {
1137                 $profile = APContact::getByURL($target);
1138
1139                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1140
1141                 $owner = User::getOwnerDataById($uid);
1142                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1143                         'id' => $id,
1144                         'type' => 'Undo',
1145                         'actor' => $owner['url'],
1146                         'object' => ['id' => $id, 'type' => 'Follow',
1147                                 'actor' => $owner['url'],
1148                                 'object' => $profile['url']],
1149                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1150                         'to' => $profile['url']];
1151
1152                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1153
1154                 $signed = LDSignature::sign($data, $owner);
1155                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1156         }
1157 }