src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Core\Logger;
  10 use Friendica\Core\System;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\APContact;
  16 use Friendica\Model\Item;
  17 use Friendica\Model\Term;
  18 use Friendica\Model\User;
  19 use Friendica\Util\DateTimeFormat;
  20 use Friendica\Content\Text\BBCode;
  21 use Friendica\Util\JsonLD;
  22 use Friendica\Util\LDSignature;
  23 use Friendica\Model\Profile;
  24 use Friendica\Core\Config;
  25 use Friendica\Object\Image;
  26 use Friendica\Protocol\ActivityPub;
  27 use Friendica\Protocol\Diaspora;
  28 use Friendica\Core\Cache;
  29 use Friendica\Util\Map;
  30 use Friendica\Util\Network;
  31
  32 require_once 'include/api.php';
  33
  34 /**
  35  * @brief ActivityPub Transmitter Protocol class
  36  *
  37  * To-Do:
  38  * - Undo Announce
  39  */
  40 class Transmitter
  41 {
  42         /**
  43          * collects the lost of followers of the given owner
  44          *
  45          * @param array $owner Owner array
  46          * @param integer $page Page number
  47          *
  48          * @return array of owners
  49          */
  50         public static function getFollowers($owner, $page = null)
  51         {
  52                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  53                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  54                 $count = DBA::count('contact', $condition);
  55
  56                 $data = ['@context' => ActivityPub::CONTEXT];
  57                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  58                 $data['type'] = 'OrderedCollection';
  59                 $data['totalItems'] = $count;
  60
  61                 // When we hide our friends we will only show the pure number but don't allow more.
  62                 $profile = Profile::getByUID($owner['uid']);
  63                 if (!empty($profile['hide-friends'])) {
  64                         return $data;
  65                 }
  66
  67                 if (empty($page)) {
  68                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  69                 } else {
  70                         $list = [];
  71
  72                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  73                         while ($contact = DBA::fetch($contacts)) {
  74                                 $list[] = $contact['url'];
  75                         }
  76
  77                         if (!empty($list)) {
  78                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  79                         }
  80
  81                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  82
  83                         $data['orderedItems'] = $list;
  84                 }
  85
  86                 return $data;
  87         }
  88
  89         /**
  90          * Create list of following contacts
  91          *
  92          * @param array $owner Owner array
  93          * @param integer $page Page numbe
  94          *
  95          * @return array of following contacts
  96          */
  97         public static function getFollowing($owner, $page = null)
  98         {
  99                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 100                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 101                 $count = DBA::count('contact', $condition);
 102
 103                 $data = ['@context' => ActivityPub::CONTEXT];
 104                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 105                 $data['type'] = 'OrderedCollection';
 106                 $data['totalItems'] = $count;
 107
 108                 // When we hide our friends we will only show the pure number but don't allow more.
 109                 $profile = Profile::getByUID($owner['uid']);
 110                 if (!empty($profile['hide-friends'])) {
 111                         return $data;
 112                 }
 113
 114                 if (empty($page)) {
 115                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 116                 } else {
 117                         $list = [];
 118
 119                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 120                         while ($contact = DBA::fetch($contacts)) {
 121                                 $list[] = $contact['url'];
 122                         }
 123
 124                         if (!empty($list)) {
 125                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 126                         }
 127
 128                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 129
 130                         $data['orderedItems'] = $list;
 131                 }
 132
 133                 return $data;
 134         }
 135
 136         /**
 137          * Public posts for the given owner
 138          *
 139          * @param array $owner Owner array
 140          * @param integer $page Page numbe
 141          *
 142          * @return array of posts
 143          */
 144         public static function getOutbox($owner, $page = null)
 145         {
 146                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 147
 148                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 149                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 150                         'deleted' => false, 'visible' => true];
 151                 $count = DBA::count('item', $condition);
 152
 153                 $data = ['@context' => ActivityPub::CONTEXT];
 154                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 155                 $data['type'] = 'OrderedCollection';
 156                 $data['totalItems'] = $count;
 157
 158                 if (empty($page)) {
 159                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 160                 } else {
 161                         $list = [];
 162
 163                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 164
 165                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 166                         while ($item = Item::fetch($items)) {
 167                                 $object = self::createObjectFromItemID($item['id']);
 168                                 unset($object['@context']);
 169                                 $list[] = $object;
 170                         }
 171
 172                         if (!empty($list)) {
 173                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 174                         }
 175
 176                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 177
 178                         $data['orderedItems'] = $list;
 179                 }
 180
 181                 return $data;
 182         }
 183
 184         /**
 185          * Return the ActivityPub profile of the given user
 186          *
 187          * @param integer $uid User ID
 188          * @return array with profile data
 189          */
 190         public static function getProfile($uid)
 191         {
 192                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 193                         'account_removed' => false, 'verified' => true];
 194                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 195                 $user = DBA::selectFirst('user', $fields, $condition);
 196                 if (!DBA::isResult($user)) {
 197                         return [];
 198                 }
 199
 200                 $fields = ['locality', 'region', 'country-name'];
 201                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 202                 if (!DBA::isResult($profile)) {
 203                         return [];
 204                 }
 205
 206                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 207                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 208                 if (!DBA::isResult($contact)) {
 209                         return [];
 210                 }
 211
 212                 // On old installations and never changed contacts this might not be filled
 213                 if (empty($contact['avatar'])) {
 214                         $contact['avatar'] = $contact['photo'];
 215                 }
 216
 217                 $data = ['@context' => ActivityPub::CONTEXT];
 218                 $data['id'] = $contact['url'];
 219                 $data['diaspora:guid'] = $user['guid'];
 220                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 221                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 222                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 223                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 224                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 225                 $data['preferredUsername'] = $user['nickname'];
 226                 $data['name'] = $contact['name'];
 227                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 228                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 229                 $data['summary'] = $contact['about'];
 230                 $data['url'] = $contact['url'];
 231                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 232                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 233                         'owner' => $contact['url'],
 234                         'publicKeyPem' => $user['pubkey']];
 235                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 236                 $data['icon'] = ['type' => 'Image',
 237                         'url' => $contact['avatar']];
 238
 239                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 240                 return $data;
 241         }
 242
 243         /**
 244          * Returns an array with permissions of a given item array
 245          *
 246          * @param array $item
 247          *
 248          * @return array with permissions
 249          */
 250         private static function fetchPermissionBlockFromConversation($item)
 251         {
 252                 if (empty($item['thr-parent'])) {
 253                         return [];
 254                 }
 255
 256                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 257                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 258                 if (!DBA::isResult($conversation)) {
 259                         return [];
 260                 }
 261
 262                 $activity = json_decode($conversation['source'], true);
 263
 264                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 265                 $profile = APContact::getByURL($actor);
 266
 267                 $item_profile = APContact::getByURL($item['author-link']);
 268                 $exclude[] = $item['author-link'];
 269
 270                 if ($item['gravity'] == GRAVITY_PARENT) {
 271                         $exclude[] = $item['owner-link'];
 272                 }
 273
 274                 $permissions['to'][] = $actor;
 275
 276                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 277                         if (empty($activity[$element])) {
 278                                 continue;
 279                         }
 280                         if (is_string($activity[$element])) {
 281                                 $activity[$element] = [$activity[$element]];
 282                         }
 283
 284                         foreach ($activity[$element] as $receiver) {
 285                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 286                                         $permissions[$element][] = $item_profile['followers'];
 287                                 } elseif (!in_array($receiver, $exclude)) {
 288                                         $permissions[$element][] = $receiver;
 289                                 }
 290                         }
 291                 }
 292                 return $permissions;
 293         }
 294
 295         /**
 296          * Creates an array of permissions from an item thread
 297          *
 298          * @param array $item
 299          * @param boolean $blindcopy
 300          *
 301          * @return array with permission data
 302          */
 303         private static function createPermissionBlockForItem($item, $blindcopy)
 304         {
 305                 // Will be activated in a later step
 306                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 307
 308                 // For now only send to these contacts:
 309                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 310
 311                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 312
 313                 $actor_profile = APContact::getByURL($item['author-link']);
 314
 315                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 316
 317                 if (!$item['private']) {
 318                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 319
 320                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 321                         if (!empty($actor_profile['followers'])) {
 322                                 $data['cc'][] = $actor_profile['followers'];
 323                         }
 324
 325                         foreach ($terms as $term) {
 326                                 $profile = APContact::getByURL($term['url'], false);
 327                                 if (!empty($profile)) {
 328                                         $data['to'][] = $profile['url'];
 329                                 }
 330                         }
 331                 } else {
 332                         $receiver_list = Item::enumeratePermissions($item);
 333
 334                         $mentioned = [];
 335
 336                         foreach ($terms as $term) {
 337                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 338                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 339                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 340                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 341                                                 $data['to'][] = $profile['url'];
 342                                         }
 343                                 }
 344                         }
 345
 346                         foreach ($receiver_list as $receiver) {
 347                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => $networks]);
 348                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 349                                         // BCC is currently deactivated, due to Pleroma and Mastodon not reacting like expected
 350                                         // $data['bcc'][] = $profile['url'];
 351                                         $data['cc'][] = $profile['url'];
 352                                 }
 353                         }
 354                 }
 355
 356                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 357                 while ($parent = Item::fetch($parents)) {
 358                         // Don't include data from future posts
 359                         if ($parent['id'] >= $item['id']) {
 360                                 continue;
 361                         }
 362
 363                         $profile = APContact::getByURL($parent['author-link'], false);
 364                         if (!empty($profile)) {
 365                                 if ($parent['uri'] == $item['thr-parent']) {
 366                                         $data['to'][] = $profile['url'];
 367                                 } else {
 368                                         $data['cc'][] = $profile['url'];
 369                                 }
 370                         }
 371
 372                         if ($item['gravity'] != GRAVITY_PARENT) {
 373                                 continue;
 374                         }
 375
 376                         $profile = APContact::getByURL($parent['owner-link'], false);
 377                         if (!empty($profile)) {
 378                                 $data['cc'][] = $profile['url'];
 379                         }
 380                 }
 381                 DBA::close($parents);
 382
 383                 $data['to'] = array_unique($data['to']);
 384                 $data['cc'] = array_unique($data['cc']);
 385                 $data['bcc'] = array_unique($data['bcc']);
 386
 387                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 388                         unset($data['to'][$key]);
 389                 }
 390
 391                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 392                         unset($data['cc'][$key]);
 393                 }
 394
 395                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 396                         unset($data['bcc'][$key]);
 397                 }
 398
 399                 foreach ($data['to'] as $to) {
 400                         if (($key = array_search($to, $data['cc'])) !== false) {
 401                                 unset($data['cc'][$key]);
 402                         }
 403
 404                         if (($key = array_search($to, $data['bcc'])) !== false) {
 405                                 unset($data['bcc'][$key]);
 406                         }
 407                 }
 408
 409                 foreach ($data['cc'] as $cc) {
 410                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 411                                 unset($data['bcc'][$key]);
 412                         }
 413                 }
 414
 415                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 416
 417                 if (!$blindcopy) {
 418                         unset($receivers['bcc']);
 419                 }
 420
 421                 return $receivers;
 422         }
 423
 424         /**
 425          * Fetches a list of inboxes of followers of a given user
 426          *
 427          * @param integer $uid User ID
 428          * @param boolean $personal fetch personal inboxes
 429          *
 430          * @return array of follower inboxes
 431          */
 432         public static function fetchTargetInboxesforUser($uid, $personal = false)
 433         {
 434                 $inboxes = [];
 435
 436                 // Will be activated in a later step
 437                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 438
 439                 // For now only send to these contacts:
 440                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 441
 442                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 443
 444                 if (!empty($uid)) {
 445                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 446                 }
 447
 448                 $contacts = DBA::select('contact', ['url'], $condition);
 449                 while ($contact = DBA::fetch($contacts)) {
 450                         if (Network::isUrlBlocked($contact['url'])) {
 451                                 continue;
 452                         }
 453
 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 $receiver) {
 501                                 if (Network::isUrlBlocked($receiver)) {
 502                                         continue;
 503                                 }
 504
 505                                 if ($receiver == $item_profile['followers']) {
 506                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 507                                 } else {
 508                                         $profile = APContact::getByURL($receiver, false);
 509                                         if (!empty($profile)) {
 510                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 511                                                         $target = $profile['inbox'];
 512                                                 } else {
 513                                                         $target = $profile['sharedinbox'];
 514                                                 }
 515                                                 $inboxes[$target] = $target;
 516                                         }
 517                                 }
 518                         }
 519                 }
 520
 521                 return $inboxes;
 522         }
 523
 524         /**
 525          * Returns the activity type of a given item
 526          *
 527          * @param array $item
 528          *
 529          * @return string with activity type
 530          */
 531         private static function getTypeOfItem($item)
 532         {
 533                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 534                         $type = 'Announce';
 535                 } elseif ($item['verb'] == ACTIVITY_POST) {
 536                         if ($item['created'] == $item['edited']) {
 537                                 $type = 'Create';
 538                         } else {
 539                                 $type = 'Update';
 540                         }
 541                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 542                         $type = 'Like';
 543                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 544                         $type = 'Dislike';
 545                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 546                         $type = 'Accept';
 547                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 548                         $type = 'Reject';
 549                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 550                         $type = 'TentativeAccept';
 551                 } else {
 552                         $type = '';
 553                 }
 554
 555                 return $type;
 556         }
 557
 558         /**
 559          * Creates the activity or fetches it from the cache
 560          *
 561          * @param integer $item_id
 562          * @param boolean $force   Force new cache entry
 563          *
 564          * @return array with the activity
 565          */
 566         public static function createCachedActivityFromItem($item_id, $force = false)
 567         {
 568                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 569
 570                 if (!$force) {
 571                         $data = Cache::get($cachekey);
 572                         if (!is_null($data)) {
 573                                 return $data;
 574                         }
 575                 }
 576
 577                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 578
 579                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 580                 return $data;
 581         }
 582
 583         /**
 584          * Creates an activity array for a given item id
 585          *
 586          * @param integer $item_id
 587          * @param boolean $object_mode Is the activity item is used inside another object?
 588          *
 589          * @return array of activity
 590          */
 591         public static function createActivityFromItem($item_id, $object_mode = false)
 592         {
 593                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 594
 595                 if (!DBA::isResult($item)) {
 596                         return false;
 597                 }
 598
 599                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 600                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 601                 if (DBA::isResult($conversation)) {
 602                         $data = json_decode($conversation['source']);
 603                         if (!empty($data)) {
 604                                 return $data;
 605                         }
 606                 }
 607
 608                 $type = self::getTypeOfItem($item);
 609
 610                 if (!$object_mode) {
 611                         $data = ['@context' => ActivityPub::CONTEXT];
 612
 613                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 614                                 $type = 'Undo';
 615                         } elseif ($item['deleted']) {
 616                                 $type = 'Delete';
 617                         }
 618                 } else {
 619                         $data = [];
 620                 }
 621
 622                 $data['id'] = $item['uri'] . '#' . $type;
 623                 $data['type'] = $type;
 624                 $data['actor'] = $item['owner-link'];
 625
 626                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 627
 628                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 629
 630                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 631
 632                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 633                         $data['object'] = self::createNote($item);
 634                 } elseif ($data['type'] == 'Announce') {
 635                         $data['object'] = self::createAnnounce($item);
 636                 } elseif ($data['type'] == 'Undo') {
 637                         $data['object'] = self::createActivityFromItem($item_id, true);
 638                 } else {
 639                         $data['diaspora:guid'] = $item['guid'];
 640                         if (!empty($item['signed_text'])) {
 641                                 $data['diaspora:like'] = $item['signed_text'];
 642                         }
 643                         $data['object'] = $item['thr-parent'];
 644                 }
 645
 646                 $owner = User::getOwnerDataById($item['contact-uid']);
 647
 648                 if (!$object_mode) {
 649                         return LDSignature::sign($data, $owner);
 650                 } else {
 651                         return $data;
 652                 }
 653
 654                 /// @todo Create "conversation" entry
 655         }
 656
 657         /**
 658          * Creates an object array for a given item id
 659          *
 660          * @param integer $item_id
 661          *
 662          * @return array with the object data
 663          */
 664         public static function createObjectFromItemID($item_id)
 665         {
 666                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 667
 668                 if (!DBA::isResult($item)) {
 669                         return false;
 670                 }
 671
 672                 $data = ['@context' => ActivityPub::CONTEXT];
 673                 $data = array_merge($data, self::createNote($item));
 674
 675                 return $data;
 676         }
 677
 678         /**
 679          * Creates a location entry for a given item array
 680          *
 681          * @param array $item
 682          *
 683          * @return array with location array
 684          */
 685         private static function createLocation($item)
 686         {
 687                 $location = ['type' => 'Place'];
 688
 689                 if (!empty($item['location'])) {
 690                         $location['name'] = $item['location'];
 691                 }
 692
 693                 $coord = [];
 694
 695                 if (empty($item['coord'])) {
 696                         $coord = Map::getCoordinates($item['location']);
 697                 } else {
 698                         $coords = explode(' ', $item['coord']);
 699                         if (count($coords) == 2) {
 700                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 701                         }
 702                 }
 703
 704                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 705                         $location['latitude'] = $coord['lat'];
 706                         $location['longitude'] = $coord['lon'];
 707                 }
 708
 709                 return $location;
 710         }
 711
 712         /**
 713          * Returns a tag array for a given item array
 714          *
 715          * @param array $item
 716          *
 717          * @return array of tags
 718          */
 719         private static function createTagList($item)
 720         {
 721                 $tags = [];
 722
 723                 $terms = Term::tagArrayFromItemId($item['id']);
 724                 foreach ($terms as $term) {
 725                         if ($term['type'] == TERM_HASHTAG) {
 726                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 727                         } elseif ($term['type'] == TERM_MENTION) {
 728                                 $contact = Contact::getDetailsByURL($term['url']);
 729                                 if (!empty($contact['addr'])) {
 730                                         $mention = '@' . $contact['addr'];
 731                                 } else {
 732                                         $mention = '@' . $term['url'];
 733                                 }
 734
 735                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 736                         }
 737                 }
 738                 return $tags;
 739         }
 740
 741         /**
 742          * Adds attachment data to the JSON document
 743          *
 744          * @param array $item Data of the item that is to be posted
 745          * @param text $type Object type
 746          *
 747          * @return array with attachment data
 748          */
 749         private static function createAttachmentList($item, $type)
 750         {
 751                 $attachments = [];
 752
 753                 $arr = explode('[/attach],', $item['attach']);
 754                 if (count($arr)) {
 755                         foreach ($arr as $r) {
 756                                 $matches = false;
 757                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 758                                 if ($cnt) {
 759                                         $attributes = ['type' => 'Document',
 760                                                         'mediaType' => $matches[3],
 761                                                         'url' => $matches[1],
 762                                                         'name' => null];
 763
 764                                         if (trim($matches[4]) != '') {
 765                                                 $attributes['name'] = trim($matches[4]);
 766                                         }
 767
 768                                         $attachments[] = $attributes;
 769                                 }
 770                         }
 771                 }
 772
 773                 if ($type != 'Note') {
 774                         return $attachments;
 775                 }
 776
 777                 // Simplify image codes
 778                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 779
 780                 // Grab all pictures and create attachments out of them
 781                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 782                         foreach ($pictures[1] as $picture) {
 783                                 $imgdata = Image::getInfoFromURL($picture);
 784                                 if ($imgdata) {
 785                                         $attachments[] = ['type' => 'Document',
 786                                                 'mediaType' => $imgdata['mime'],
 787                                                 'url' => $picture,
 788                                                 'name' => null];
 789                                 }
 790                         }
 791                 }
 792
 793                 return $attachments;
 794         }
 795
 796         /**
 797          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 798          *
 799          * @param array $match Matching values for the callback
 800          * @return string Replaced mention
 801          */
 802         private static function mentionCallback($match)
 803         {
 804                 if (empty($match[1])) {
 805                         return;
 806                 }
 807
 808                 $data = Contact::getDetailsByURL($match[1]);
 809                 if (empty($data) || empty($data['nick'])) {
 810                         return;
 811                 }
 812
 813                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 814         }
 815
 816         /**
 817          * Remove image elements and replaces them with links to the image
 818          *
 819          * @param string $body
 820          *
 821          * @return string with replaced elements
 822          */
 823         private static function removePictures($body)
 824         {
 825                 // Simplify image codes
 826                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 827
 828                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 829                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 830
 831                 return $body;
 832         }
 833
 834         /**
 835          * Fetches the "context" value for a givem item array from the "conversation" table
 836          *
 837          * @param array $item
 838          *
 839          * @return string with context url
 840          */
 841         private static function fetchContextURLForItem($item)
 842         {
 843                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 844                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 845                         $context_uri = $conversation['conversation-href'];
 846                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 847                         $context_uri = $conversation['conversation-uri'];
 848                 } else {
 849                         $context_uri = $item['parent-uri'] . '#context';
 850                 }
 851                 return $context_uri;
 852         }
 853
 854         /**
 855          * Returns if the post contains sensitive content ("nsfw")
 856          *
 857          * @param integer $item_id
 858          *
 859          * @return boolean
 860          */
 861         private static function isSensitive($item_id)
 862         {
 863                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 864                 return DBA::exists('term', $condition);
 865         }
 866
 867         /**
 868          * Creates event data
 869          *
 870          * @param array $item
 871          *
 872          * @return array with the event data
 873          */
 874         public static function createEvent($item)
 875         {
 876                 $event = [];
 877                 $event['name'] = $item['event-summary'];
 878                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 879                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 880
 881                 if (!$item['event-nofinish']) {
 882                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 883                 }
 884
 885                 if (!empty($item['event-location'])) {
 886                         $item['location'] = $item['event-location'];
 887                         $event['location'] = self::createLocation($item);
 888                 }
 889
 890                 return $event;
 891         }
 892
 893         /**
 894          * Creates a note/article object array
 895          *
 896          * @param array $item
 897          *
 898          * @return array with the object data
 899          */
 900         public static function createNote($item)
 901         {
 902                 if ($item['event-type'] == 'event') {
 903                         $type = 'Event';
 904                 } elseif (!empty($item['title'])) {
 905                         $type = 'Article';
 906                 } else {
 907                         $type = 'Note';
 908                 }
 909
 910                 if ($item['deleted']) {
 911                         $type = 'Tombstone';
 912                 }
 913
 914                 $data = [];
 915                 $data['id'] = $item['uri'];
 916                 $data['type'] = $type;
 917
 918                 if ($item['deleted']) {
 919                         return $data;
 920                 }
 921
 922                 $data['summary'] = null; // Ignore by now
 923
 924                 if ($item['uri'] != $item['thr-parent']) {
 925                         $data['inReplyTo'] = $item['thr-parent'];
 926                 } else {
 927                         $data['inReplyTo'] = null;
 928                 }
 929
 930                 $data['diaspora:guid'] = $item['guid'];
 931                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 932
 933                 if ($item['created'] != $item['edited']) {
 934                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 935                 }
 936
 937                 $data['url'] = $item['plink'];
 938                 $data['attributedTo'] = $item['author-link'];
 939                 $data['sensitive'] = self::isSensitive($item['id']);
 940                 $data['context'] = self::fetchContextURLForItem($item);
 941
 942                 if (!empty($item['title'])) {
 943                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 944                 }
 945
 946                 $body = $item['body'];
 947
 948                 if ($type == 'Note') {
 949                         $body = self::removePictures($body);
 950                 }
 951
 952                 if ($type == 'Event') {
 953                         $data = array_merge($data, self::createEvent($item));
 954                 } else {
 955                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 956                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 957
 958                         $data['content'] = BBCode::convert($body, false, 7);
 959                 }
 960
 961                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 962
 963                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 964                         $data['diaspora:comment'] = $item['signed_text'];
 965                 }
 966
 967                 $data['attachment'] = self::createAttachmentList($item, $type);
 968                 $data['tag'] = self::createTagList($item);
 969
 970                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 971                         $data['location'] = self::createLocation($item);
 972                 }
 973
 974                 if (!empty($item['app'])) {
 975                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 976                 }
 977
 978                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 979
 980                 return $data;
 981         }
 982
 983         /**
 984          * Creates an announce object entry
 985          *
 986          * @param array $item
 987          *
 988          * @return string with announced object url
 989          */
 990         public static function createAnnounce($item)
 991         {
 992                 $announce = api_share_as_retweet($item);
 993                 if (empty($announce['plink'])) {
 994                         return self::createNote($item);
 995                 }
 996
 997                 return $announce['plink'];
 998         }
 999
1000         /**
1001          * Creates an activity id for a given contact id
1002          *
1003          * @param integer $cid Contact ID of target
1004          *
1005          * @return bool|string activity id
1006          */
1007         public static function activityIDFromContact($cid)
1008         {
1009                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1010                 if (!DBA::isResult($contact)) {
1011                         return false;
1012                 }
1013
1014                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1015                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1016                 return System::baseUrl() . '/activity/' . $uuid;
1017         }
1018
1019         /**
1020          * Transmits a contact suggestion to a given inbox
1021          *
1022          * @param integer $uid User ID
1023          * @param string $inbox Target inbox
1024          * @param integer $suggestion_id Suggestion ID
1025          *
1026          * @return boolean was the transmission successful?
1027          */
1028         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1029         {
1030                 $owner = User::getOwnerDataById($uid);
1031
1032                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1033
1034                 $data = ['@context' => ActivityPub::CONTEXT,
1035                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1036                         'type' => 'Announce',
1037                         'actor' => $owner['url'],
1038                         'object' => $suggestion['url'],
1039                         'content' => $suggestion['note'],
1040                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1041                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1042                         'cc' => []];
1043
1044                 $signed = LDSignature::sign($data, $owner);
1045
1046                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1047                 return HTTPSignature::transmit($signed, $inbox, $uid);
1048         }
1049
1050         /**
1051          * Transmits a profile relocation to a given inbox
1052          *
1053          * @param integer $uid User ID
1054          * @param string $inbox Target inbox
1055          *
1056          * @return boolean was the transmission successful?
1057          */
1058         public static function sendProfileRelocation($uid, $inbox)
1059         {
1060                 $owner = User::getOwnerDataById($uid);
1061
1062                 $data = ['@context' => ActivityPub::CONTEXT,
1063                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1064                         'type' => 'dfrn:relocate',
1065                         'actor' => $owner['url'],
1066                         'object' => $owner['url'],
1067                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1068                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1069                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1070                         'cc' => []];
1071
1072                 $signed = LDSignature::sign($data, $owner);
1073
1074                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1075                 return HTTPSignature::transmit($signed, $inbox, $uid);
1076         }
1077
1078         /**
1079          * Transmits a profile deletion to a given inbox
1080          *
1081          * @param integer $uid User ID
1082          * @param string $inbox Target inbox
1083          *
1084          * @return boolean was the transmission successful?
1085          */
1086         public static function sendProfileDeletion($uid, $inbox)
1087         {
1088                 $owner = User::getOwnerDataById($uid);
1089
1090                 $data = ['@context' => ActivityPub::CONTEXT,
1091                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1092                         'type' => 'Delete',
1093                         'actor' => $owner['url'],
1094                         'object' => $owner['url'],
1095                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1096                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1097                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1098                         'cc' => []];
1099
1100                 $signed = LDSignature::sign($data, $owner);
1101
1102                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1103                 return HTTPSignature::transmit($signed, $inbox, $uid);
1104         }
1105
1106         /**
1107          * Transmits a profile change to a given inbox
1108          *
1109          * @param integer $uid User ID
1110          * @param string $inbox Target inbox
1111          *
1112          * @return boolean was the transmission successful?
1113          */
1114         public static function sendProfileUpdate($uid, $inbox)
1115         {
1116                 $owner = User::getOwnerDataById($uid);
1117                 $profile = APContact::getByURL($owner['url']);
1118
1119                 $data = ['@context' => ActivityPub::CONTEXT,
1120                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1121                         'type' => 'Update',
1122                         'actor' => $owner['url'],
1123                         'object' => self::getProfile($uid),
1124                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1125                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1126                         'to' => [$profile['followers']],
1127                         'cc' => []];
1128
1129                 $signed = LDSignature::sign($data, $owner);
1130
1131                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1132                 return HTTPSignature::transmit($signed, $inbox, $uid);
1133         }
1134
1135         /**
1136          * Transmits a given activity to a target
1137          *
1138          * @param array $activity
1139          * @param string $target Target profile
1140          * @param integer $uid User ID
1141          * @param string $id activity id
1142          */
1143         public static function sendActivity($activity, $target, $uid, $id = '')
1144         {
1145                 $profile = APContact::getByURL($target);
1146
1147                 $owner = User::getOwnerDataById($uid);
1148
1149                 if (empty($id)) {
1150                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1151                 }
1152
1153                 $data = ['@context' => ActivityPub::CONTEXT,
1154                         'id' => $id,
1155                         'type' => $activity,
1156                         'actor' => $owner['url'],
1157                         'object' => $profile['url'],
1158                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1159                         'to' => [$profile['url']]];
1160
1161                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1162
1163                 $signed = LDSignature::sign($data, $owner);
1164                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1165         }
1166
1167         /**
1168          * Transmit a message that the contact request had been accepted
1169          *
1170          * @param string $target Target profile
1171          * @param $id
1172          * @param integer $uid User ID
1173          */
1174         public static function sendContactAccept($target, $id, $uid)
1175         {
1176                 $profile = APContact::getByURL($target);
1177
1178                 $owner = User::getOwnerDataById($uid);
1179                 $data = ['@context' => ActivityPub::CONTEXT,
1180                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1181                         'type' => 'Accept',
1182                         'actor' => $owner['url'],
1183                         'object' => ['id' => $id, 'type' => 'Follow',
1184                                 'actor' => $profile['url'],
1185                                 'object' => $owner['url']],
1186                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1187                         'to' => [$profile['url']]];
1188
1189                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1190
1191                 $signed = LDSignature::sign($data, $owner);
1192                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1193         }
1194
1195         /**
1196          * Reject a contact request or terminates the contact relation
1197          *
1198          * @param string $target Target profile
1199          * @param $id
1200          * @param integer $uid User ID
1201          */
1202         public static function sendContactReject($target, $id, $uid)
1203         {
1204                 $profile = APContact::getByURL($target);
1205
1206                 $owner = User::getOwnerDataById($uid);
1207                 $data = ['@context' => ActivityPub::CONTEXT,
1208                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1209                         'type' => 'Reject',
1210                         'actor' => $owner['url'],
1211                         'object' => ['id' => $id, 'type' => 'Follow',
1212                                 'actor' => $profile['url'],
1213                                 'object' => $owner['url']],
1214                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1215                         'to' => [$profile['url']]];
1216
1217                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1218
1219                 $signed = LDSignature::sign($data, $owner);
1220                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1221         }
1222
1223         /**
1224          * Transmits a message that we don't want to follow this contact anymore
1225          *
1226          * @param string $target Target profile
1227          * @param integer $cid Contact ID of target
1228          * @param integer $uid User ID
1229          */
1230         public static function sendContactUndo($target, $cid, $uid)
1231         {
1232                 $profile = APContact::getByURL($target);
1233
1234                 $object_id = self::activityIDFromContact($cid);
1235                 if (empty($object_id)) {
1236                         return;
1237                 }
1238
1239                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1240
1241                 $owner = User::getOwnerDataById($uid);
1242                 $data = ['@context' => ActivityPub::CONTEXT,
1243                         'id' => $id,
1244                         'type' => 'Undo',
1245                         'actor' => $owner['url'],
1246                         'object' => ['id' => $object_id, 'type' => 'Follow',
1247                                 'actor' => $owner['url'],
1248                                 'object' => $profile['url']],
1249                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1250                         'to' => [$profile['url']]];
1251
1252                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1253
1254                 $signed = LDSignature::sign($data, $owner);
1255                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1256         }
1257 }