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  * - Undo Announce
  37  */
  38 class Transmitter
  39 {
  40         /**
  41          * collects the lost of followers of the given owner
  42          *
  43          * @param array $owner Owner array
  44          * @param integer $page Page number
  45          *
  46          * @return array of owners
  47          */
  48         public static function getFollowers($owner, $page = null)
  49         {
  50                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  51                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  52                 $count = DBA::count('contact', $condition);
  53
  54                 $data = ['@context' => ActivityPub::CONTEXT];
  55                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  56                 $data['type'] = 'OrderedCollection';
  57                 $data['totalItems'] = $count;
  58
  59                 // When we hide our friends we will only show the pure number but don't allow more.
  60                 $profile = Profile::getByUID($owner['uid']);
  61                 if (!empty($profile['hide-friends'])) {
  62                         return $data;
  63                 }
  64
  65                 if (empty($page)) {
  66                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  67                 } else {
  68                         $list = [];
  69
  70                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  71                         while ($contact = DBA::fetch($contacts)) {
  72                                 $list[] = $contact['url'];
  73                         }
  74
  75                         if (!empty($list)) {
  76                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  77                         }
  78
  79                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  80
  81                         $data['orderedItems'] = $list;
  82                 }
  83
  84                 return $data;
  85         }
  86
  87         /**
  88          * Create list of following contacts
  89          *
  90          * @param array $owner Owner array
  91          * @param integer $page Page numbe
  92          *
  93          * @return array of following contacts
  94          */
  95         public static function getFollowing($owner, $page = null)
  96         {
  97                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  98                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  99                 $count = DBA::count('contact', $condition);
 100
 101                 $data = ['@context' => ActivityPub::CONTEXT];
 102                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 103                 $data['type'] = 'OrderedCollection';
 104                 $data['totalItems'] = $count;
 105
 106                 // When we hide our friends we will only show the pure number but don't allow more.
 107                 $profile = Profile::getByUID($owner['uid']);
 108                 if (!empty($profile['hide-friends'])) {
 109                         return $data;
 110                 }
 111
 112                 if (empty($page)) {
 113                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 114                 } else {
 115                         $list = [];
 116
 117                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 118                         while ($contact = DBA::fetch($contacts)) {
 119                                 $list[] = $contact['url'];
 120                         }
 121
 122                         if (!empty($list)) {
 123                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 124                         }
 125
 126                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 127
 128                         $data['orderedItems'] = $list;
 129                 }
 130
 131                 return $data;
 132         }
 133
 134         /**
 135          * Public posts for the given owner
 136          *
 137          * @param array $owner Owner array
 138          * @param integer $page Page numbe
 139          *
 140          * @return array of posts
 141          */
 142         public static function getOutbox($owner, $page = null)
 143         {
 144                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 145
 146                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 147                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 148                         'deleted' => false, 'visible' => true];
 149                 $count = DBA::count('item', $condition);
 150
 151                 $data = ['@context' => ActivityPub::CONTEXT];
 152                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 153                 $data['type'] = 'OrderedCollection';
 154                 $data['totalItems'] = $count;
 155
 156                 if (empty($page)) {
 157                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 158                 } else {
 159                         $list = [];
 160
 161                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 162
 163                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 164                         while ($item = Item::fetch($items)) {
 165                                 $object = self::createObjectFromItemID($item['id']);
 166                                 unset($object['@context']);
 167                                 $list[] = $object;
 168                         }
 169
 170                         if (!empty($list)) {
 171                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 172                         }
 173
 174                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 175
 176                         $data['orderedItems'] = $list;
 177                 }
 178
 179                 return $data;
 180         }
 181
 182         /**
 183          * Return the ActivityPub profile of the given user
 184          *
 185          * @param integer $uid User ID
 186          * @return array with profile data
 187          */
 188         public static function getProfile($uid)
 189         {
 190                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 191                         'account_removed' => false, 'verified' => true];
 192                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 193                 $user = DBA::selectFirst('user', $fields, $condition);
 194                 if (!DBA::isResult($user)) {
 195                         return [];
 196                 }
 197
 198                 $fields = ['locality', 'region', 'country-name'];
 199                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 200                 if (!DBA::isResult($profile)) {
 201                         return [];
 202                 }
 203
 204                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 205                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 206                 if (!DBA::isResult($contact)) {
 207                         return [];
 208                 }
 209
 210                 // On old installations and never changed contacts this might not be filled
 211                 if (empty($contact['avatar'])) {
 212                         $contact['avatar'] = $contact['photo'];
 213                 }
 214
 215                 $data = ['@context' => ActivityPub::CONTEXT];
 216                 $data['id'] = $contact['url'];
 217                 $data['diaspora:guid'] = $user['guid'];
 218                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 219                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 220                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 221                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 222                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 223                 $data['preferredUsername'] = $user['nickname'];
 224                 $data['name'] = $contact['name'];
 225                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 226                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 227                 $data['summary'] = $contact['about'];
 228                 $data['url'] = $contact['url'];
 229                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 230                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 231                         'owner' => $contact['url'],
 232                         'publicKeyPem' => $user['pubkey']];
 233                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 234                 $data['icon'] = ['type' => 'Image',
 235                         'url' => $contact['avatar']];
 236
 237                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 238                 return $data;
 239         }
 240
 241         /**
 242          * Returns an array with permissions of a given item array
 243          *
 244          * @param array $item
 245          *
 246          * @return array with permissions
 247          */
 248         private static function fetchPermissionBlockFromConversation($item)
 249         {
 250                 if (empty($item['thr-parent'])) {
 251                         return [];
 252                 }
 253
 254                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 255                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 256                 if (!DBA::isResult($conversation)) {
 257                         return [];
 258                 }
 259
 260                 $activity = json_decode($conversation['source'], true);
 261
 262                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 263                 $profile = APContact::getByURL($actor);
 264
 265                 $item_profile = APContact::getByURL($item['author-link']);
 266                 $exclude[] = $item['author-link'];
 267
 268                 if ($item['gravity'] == GRAVITY_PARENT) {
 269                         $exclude[] = $item['owner-link'];
 270                 }
 271
 272                 $permissions['to'][] = $actor;
 273
 274                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 275                         if (empty($activity[$element])) {
 276                                 continue;
 277                         }
 278                         if (is_string($activity[$element])) {
 279                                 $activity[$element] = [$activity[$element]];
 280                         }
 281
 282                         foreach ($activity[$element] as $receiver) {
 283                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 284                                         $permissions[$element][] = $item_profile['followers'];
 285                                 } elseif (!in_array($receiver, $exclude)) {
 286                                         $permissions[$element][] = $receiver;
 287                                 }
 288                         }
 289                 }
 290                 return $permissions;
 291         }
 292
 293         /**
 294          * Creates an array of permissions from an item thread
 295          *
 296          * @param array $item
 297          * @param boolean $blindcopy
 298          *
 299          * @return array with permission data
 300          */
 301         private static function createPermissionBlockForItem($item, $blindcopy)
 302         {
 303                 // Will be activated in a later step
 304                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 305
 306                 // For now only send to these contacts:
 307                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 308
 309                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 310
 311                 $actor_profile = APContact::getByURL($item['author-link']);
 312
 313                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 314
 315                 if (!$item['private']) {
 316                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 317
 318                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 319                         if (!empty($actor_profile['followers'])) {
 320                                 $data['cc'][] = $actor_profile['followers'];
 321                         }
 322
 323                         foreach ($terms as $term) {
 324                                 $profile = APContact::getByURL($term['url'], false);
 325                                 if (!empty($profile)) {
 326                                         $data['to'][] = $profile['url'];
 327                                 }
 328                         }
 329                 } else {
 330                         $receiver_list = Item::enumeratePermissions($item);
 331
 332                         $mentioned = [];
 333
 334                         foreach ($terms as $term) {
 335                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 336                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 337                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 338                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 339                                                 $data['to'][] = $profile['url'];
 340                                         }
 341                                 }
 342                         }
 343
 344                         foreach ($receiver_list as $receiver) {
 345                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => $networks]);
 346                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 347                                         // BCC is currently deactivated, due to Pleroma and Mastodon not reacting like expected
 348                                         // $data['bcc'][] = $profile['url'];
 349                                         $data['cc'][] = $profile['url'];
 350                                 }
 351                         }
 352                 }
 353
 354                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 355                 while ($parent = Item::fetch($parents)) {
 356                         // Don't include data from future posts
 357                         if ($parent['id'] >= $item['id']) {
 358                                 continue;
 359                         }
 360
 361                         $profile = APContact::getByURL($parent['author-link'], false);
 362                         if (!empty($profile)) {
 363                                 if ($parent['uri'] == $item['thr-parent']) {
 364                                         $data['to'][] = $profile['url'];
 365                                 } else {
 366                                         $data['cc'][] = $profile['url'];
 367                                 }
 368                         }
 369
 370                         if ($item['gravity'] != GRAVITY_PARENT) {
 371                                 continue;
 372                         }
 373
 374                         $profile = APContact::getByURL($parent['owner-link'], false);
 375                         if (!empty($profile)) {
 376                                 $data['cc'][] = $profile['url'];
 377                         }
 378                 }
 379                 DBA::close($parents);
 380
 381                 $data['to'] = array_unique($data['to']);
 382                 $data['cc'] = array_unique($data['cc']);
 383                 $data['bcc'] = array_unique($data['bcc']);
 384
 385                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 386                         unset($data['to'][$key]);
 387                 }
 388
 389                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 390                         unset($data['cc'][$key]);
 391                 }
 392
 393                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 394                         unset($data['bcc'][$key]);
 395                 }
 396
 397                 foreach ($data['to'] as $to) {
 398                         if (($key = array_search($to, $data['cc'])) !== false) {
 399                                 unset($data['cc'][$key]);
 400                         }
 401
 402                         if (($key = array_search($to, $data['bcc'])) !== false) {
 403                                 unset($data['bcc'][$key]);
 404                         }
 405                 }
 406
 407                 foreach ($data['cc'] as $cc) {
 408                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 409                                 unset($data['bcc'][$key]);
 410                         }
 411                 }
 412
 413                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 414
 415                 if (!$blindcopy) {
 416                         unset($receivers['bcc']);
 417                 }
 418
 419                 return $receivers;
 420         }
 421
 422         /**
 423          * Fetches a list of inboxes of followers of a given user
 424          *
 425          * @param integer $uid User ID
 426          * @param boolean $personal fetch personal inboxes
 427          *
 428          * @return array of follower inboxes
 429          */
 430         public static function fetchTargetInboxesforUser($uid, $personal = false)
 431         {
 432                 $inboxes = [];
 433
 434                 // Will be activated in a later step
 435                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 436
 437                 // For now only send to these contacts:
 438                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 439
 440                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 441
 442                 if (!empty($uid)) {
 443                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 444                 }
 445
 446                 $contacts = DBA::select('contact', ['url'], $condition);
 447                 while ($contact = DBA::fetch($contacts)) {
 448                         $profile = APContact::getByURL($contact['url'], false);
 449                         if (!empty($profile)) {
 450                                 if (empty($profile['sharedinbox']) || $personal) {
 451                                         $target = $profile['inbox'];
 452                                 } else {
 453                                         $target = $profile['sharedinbox'];
 454                                 }
 455                                 $inboxes[$target] = $target;
 456                         }
 457                 }
 458                 DBA::close($contacts);
 459
 460                 return $inboxes;
 461         }
 462
 463         /**
 464          * Fetches an array of inboxes for the given item and user
 465          *
 466          * @param array $item
 467          * @param integer $uid User ID
 468          * @param boolean $personal fetch personal inboxes
 469          *
 470          * @return array with inboxes
 471          */
 472         public static function fetchTargetInboxes($item, $uid, $personal = false)
 473         {
 474                 $permissions = self::createPermissionBlockForItem($item, true);
 475                 if (empty($permissions)) {
 476                         return [];
 477                 }
 478
 479                 $inboxes = [];
 480
 481                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 482                         $item_profile = APContact::getByURL($item['author-link'], false);
 483                 } else {
 484                         $item_profile = APContact::getByURL($item['owner-link'], false);
 485                 }
 486
 487                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 488                         if (empty($permissions[$element])) {
 489                                 continue;
 490                         }
 491
 492                         $blindcopy = in_array($element, ['bto', 'bcc']);
 493
 494                         foreach ($permissions[$element] as $receiver) {
 495                                 if ($receiver == $item_profile['followers']) {
 496                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 497                                 } else {
 498                                         $profile = APContact::getByURL($receiver, false);
 499                                         if (!empty($profile)) {
 500                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 501                                                         $target = $profile['inbox'];
 502                                                 } else {
 503                                                         $target = $profile['sharedinbox'];
 504                                                 }
 505                                                 $inboxes[$target] = $target;
 506                                         }
 507                                 }
 508                         }
 509                 }
 510
 511                 return $inboxes;
 512         }
 513
 514         /**
 515          * Returns the activity type of a given item
 516          *
 517          * @param array $item
 518          *
 519          * @return string with activity type
 520          */
 521         private static function getTypeOfItem($item)
 522         {
 523                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 524                         $type = 'Announce';
 525                 } elseif ($item['verb'] == ACTIVITY_POST) {
 526                         if ($item['created'] == $item['edited']) {
 527                                 $type = 'Create';
 528                         } else {
 529                                 $type = 'Update';
 530                         }
 531                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 532                         $type = 'Like';
 533                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 534                         $type = 'Dislike';
 535                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 536                         $type = 'Accept';
 537                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 538                         $type = 'Reject';
 539                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 540                         $type = 'TentativeAccept';
 541                 } else {
 542                         $type = '';
 543                 }
 544
 545                 return $type;
 546         }
 547
 548         /**
 549          * Creates the activity or fetches it from the cache
 550          *
 551          * @param integer $item_id
 552          * @param boolean $force   Force new cache entry
 553          *
 554          * @return array with the activity
 555          */
 556         public static function createCachedActivityFromItem($item_id, $force = false)
 557         {
 558                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 559
 560                 if (!$force) {
 561                         $data = Cache::get($cachekey);
 562                         if (!is_null($data)) {
 563                                 return $data;
 564                         }
 565                 }
 566
 567                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 568
 569                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 570                 return $data;
 571         }
 572
 573         /**
 574          * Creates an activity array for a given item id
 575          *
 576          * @param integer $item_id
 577          * @param boolean $object_mode Is the activity item is used inside another object?
 578          *
 579          * @return array of activity
 580          */
 581         public static function createActivityFromItem($item_id, $object_mode = false)
 582         {
 583                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 584
 585                 if (!DBA::isResult($item)) {
 586                         return false;
 587                 }
 588
 589                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 590                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 591                 if (DBA::isResult($conversation)) {
 592                         $data = json_decode($conversation['source']);
 593                         if (!empty($data)) {
 594                                 return $data;
 595                         }
 596                 }
 597
 598                 $type = self::getTypeOfItem($item);
 599
 600                 if (!$object_mode) {
 601                         $data = ['@context' => ActivityPub::CONTEXT];
 602
 603                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 604                                 $type = 'Undo';
 605                         } elseif ($item['deleted']) {
 606                                 $type = 'Delete';
 607                         }
 608                 } else {
 609                         $data = [];
 610                 }
 611
 612                 $data['id'] = $item['uri'] . '#' . $type;
 613                 $data['type'] = $type;
 614                 $data['actor'] = $item['owner-link'];
 615
 616                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 617
 618                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 619
 620                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 621
 622                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 623                         $data['object'] = self::createNote($item);
 624                 } elseif ($data['type'] == 'Announce') {
 625                         $data['object'] = self::createAnnounce($item);
 626                 } elseif ($data['type'] == 'Undo') {
 627                         $data['object'] = self::createActivityFromItem($item_id, true);
 628                 } else {
 629                         $data['diaspora:guid'] = $item['guid'];
 630                         $data['object'] = $item['thr-parent'];
 631                 }
 632
 633                 $owner = User::getOwnerDataById($item['uid']);
 634
 635                 if (!$object_mode) {
 636                         return LDSignature::sign($data, $owner);
 637                 } else {
 638                         return $data;
 639                 }
 640
 641                 /// @todo Create "conversation" entry
 642         }
 643
 644         /**
 645          * Creates an object array for a given item id
 646          *
 647          * @param integer $item_id
 648          *
 649          * @return array with the object data
 650          */
 651         public static function createObjectFromItemID($item_id)
 652         {
 653                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 654
 655                 if (!DBA::isResult($item)) {
 656                         return false;
 657                 }
 658
 659                 $data = ['@context' => ActivityPub::CONTEXT];
 660                 $data = array_merge($data, self::createNote($item));
 661
 662                 return $data;
 663         }
 664
 665         /**
 666          * Creates a location entry for a given item array
 667          *
 668          * @param array $item
 669          *
 670          * @return array with location array
 671          */
 672         private static function createLocation($item)
 673         {
 674                 $location = ['type' => 'Place'];
 675
 676                 if (!empty($item['location'])) {
 677                         $location['name'] = $item['location'];
 678                 }
 679
 680                 $coord = [];
 681
 682                 if (empty($item['coord'])) {
 683                         $coord = Map::getCoordinates($item['location']);
 684                 } else {
 685                         $coords = explode(' ', $item['coord']);
 686                         if (count($coords) == 2) {
 687                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 688                         }
 689                 }
 690
 691                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 692                         $location['latitude'] = $coord['lat'];
 693                         $location['longitude'] = $coord['lon'];
 694                 }
 695
 696                 return $location;
 697         }
 698
 699         /**
 700          * Returns a tag array for a given item array
 701          *
 702          * @param array $item
 703          *
 704          * @return array of tags
 705          */
 706         private static function createTagList($item)
 707         {
 708                 $tags = [];
 709
 710                 $terms = Term::tagArrayFromItemId($item['id']);
 711                 foreach ($terms as $term) {
 712                         if ($term['type'] == TERM_HASHTAG) {
 713                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 714                         } elseif ($term['type'] == TERM_MENTION) {
 715                                 $contact = Contact::getDetailsByURL($term['url']);
 716                                 if (!empty($contact['addr'])) {
 717                                         $mention = '@' . $contact['addr'];
 718                                 } else {
 719                                         $mention = '@' . $term['url'];
 720                                 }
 721
 722                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 723                         }
 724                 }
 725                 return $tags;
 726         }
 727
 728         /**
 729          * Adds attachment data to the JSON document
 730          *
 731          * @param array $item Data of the item that is to be posted
 732          * @param text $type Object type
 733          *
 734          * @return array with attachment data
 735          */
 736         private static function createAttachmentList($item, $type)
 737         {
 738                 $attachments = [];
 739
 740                 $arr = explode('[/attach],', $item['attach']);
 741                 if (count($arr)) {
 742                         foreach ($arr as $r) {
 743                                 $matches = false;
 744                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 745                                 if ($cnt) {
 746                                         $attributes = ['type' => 'Document',
 747                                                         'mediaType' => $matches[3],
 748                                                         'url' => $matches[1],
 749                                                         'name' => null];
 750
 751                                         if (trim($matches[4]) != '') {
 752                                                 $attributes['name'] = trim($matches[4]);
 753                                         }
 754
 755                                         $attachments[] = $attributes;
 756                                 }
 757                         }
 758                 }
 759
 760                 if ($type != 'Note') {
 761                         return $attachments;
 762                 }
 763
 764                 // Simplify image codes
 765                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 766
 767                 // Grab all pictures and create attachments out of them
 768                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 769                         foreach ($pictures[1] as $picture) {
 770                                 $imgdata = Image::getInfoFromURL($picture);
 771                                 if ($imgdata) {
 772                                         $attachments[] = ['type' => 'Document',
 773                                                 'mediaType' => $imgdata['mime'],
 774                                                 'url' => $picture,
 775                                                 'name' => null];
 776                                 }
 777                         }
 778                 }
 779
 780                 return $attachments;
 781         }
 782
 783         /**
 784          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 785          *
 786          * @param array $match Matching values for the callback
 787          * @return string Replaced mention
 788          */
 789         private static function mentionCallback($match)
 790         {
 791                 if (empty($match[1])) {
 792                         return;
 793                 }
 794
 795                 $data = Contact::getDetailsByURL($match[1]);
 796                 if (empty($data) || empty($data['nick'])) {
 797                         return;
 798                 }
 799
 800                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 801         }
 802
 803         /**
 804          * Remove image elements and replaces them with links to the image
 805          *
 806          * @param string $body
 807          *
 808          * @return string with replaced elements
 809          */
 810         private static function removePictures($body)
 811         {
 812                 // Simplify image codes
 813                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 814
 815                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 816                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 817
 818                 return $body;
 819         }
 820
 821         /**
 822          * Fetches the "context" value for a givem item array from the "conversation" table
 823          *
 824          * @param array $item
 825          *
 826          * @return string with context url
 827          */
 828         private static function fetchContextURLForItem($item)
 829         {
 830                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 831                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 832                         $context_uri = $conversation['conversation-href'];
 833                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 834                         $context_uri = $conversation['conversation-uri'];
 835                 } else {
 836                         $context_uri = $item['parent-uri'] . '#context';
 837                 }
 838                 return $context_uri;
 839         }
 840
 841         /**
 842          * Returns if the post contains sensitive content ("nsfw")
 843          *
 844          * @param integer $item_id
 845          *
 846          * @return boolean
 847          */
 848         private static function isSensitive($item_id)
 849         {
 850                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 851                 return DBA::exists('term', $condition);
 852         }
 853
 854         /**
 855          * Creates event data
 856          *
 857          * @param array $item
 858          *
 859          * @return array with the event data
 860          */
 861         public static function createEvent($item)
 862         {
 863                 $event = [];
 864                 $event['name'] = $item['event-summary'];
 865                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 866                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 867
 868                 if (!$item['event-nofinish']) {
 869                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 870                 }
 871
 872                 if (!empty($item['event-location'])) {
 873                         $item['location'] = $item['event-location'];
 874                         $event['location'] = self::createLocation($item);
 875                 }
 876
 877                 return $event;
 878         }
 879
 880         /**
 881          * Creates a note/article object array
 882          *
 883          * @param array $item
 884          *
 885          * @return array with the object data
 886          */
 887         public static function createNote($item)
 888         {
 889                 if ($item['event-type'] == 'event') {
 890                         $type = 'Event';
 891                 } elseif (!empty($item['title'])) {
 892                         $type = 'Article';
 893                 } else {
 894                         $type = 'Note';
 895                 }
 896
 897                 if ($item['deleted']) {
 898                         $type = 'Tombstone';
 899                 }
 900
 901                 $data = [];
 902                 $data['id'] = $item['uri'];
 903                 $data['type'] = $type;
 904
 905                 if ($item['deleted']) {
 906                         return $data;
 907                 }
 908
 909                 $data['summary'] = null; // Ignore by now
 910
 911                 if ($item['uri'] != $item['thr-parent']) {
 912                         $data['inReplyTo'] = $item['thr-parent'];
 913                 } else {
 914                         $data['inReplyTo'] = null;
 915                 }
 916
 917                 $data['diaspora:guid'] = $item['guid'];
 918                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 919
 920                 if ($item['created'] != $item['edited']) {
 921                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 922                 }
 923
 924                 $data['url'] = $item['plink'];
 925                 $data['attributedTo'] = $item['author-link'];
 926                 $data['sensitive'] = self::isSensitive($item['id']);
 927                 $data['context'] = self::fetchContextURLForItem($item);
 928
 929                 if (!empty($item['title'])) {
 930                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 931                 }
 932
 933                 $body = $item['body'];
 934
 935                 if ($type == 'Note') {
 936                         $body = self::removePictures($body);
 937                 }
 938
 939                 if ($type == 'Event') {
 940                         $data = array_merge($data, self::createEvent($item));
 941                 } else {
 942                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 943                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 944
 945                         $data['content'] = BBCode::convert($body, false, 7);
 946                 }
 947
 948                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 949
 950                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 951                         $data['diaspora:comment'] = $item['signed_text'];
 952                 }
 953
 954                 $data['attachment'] = self::createAttachmentList($item, $type);
 955                 $data['tag'] = self::createTagList($item);
 956
 957                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 958                         $data['location'] = self::createLocation($item);
 959                 }
 960
 961                 if (!empty($item['app'])) {
 962                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 963                 }
 964
 965                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 966
 967                 return $data;
 968         }
 969
 970         /**
 971          * Creates an announce object entry
 972          *
 973          * @param array $item
 974          *
 975          * @return string with announced object url
 976          */
 977         public static function createAnnounce($item)
 978         {
 979                 $announce = api_share_as_retweet($item);
 980                 if (empty($announce['plink'])) {
 981                         return self::createNote($item);
 982                 }
 983
 984                 return $announce['plink'];
 985         }
 986
 987         /**
 988          * Transmits a contact suggestion to a given inbox
 989          *
 990          * @param integer $uid User ID
 991          * @param string $inbox Target inbox
 992          * @param integer $suggestion_id Suggestion ID
 993          *
 994          * @return boolean was the transmission successful?
 995          */
 996         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 997         {
 998                 $owner = User::getOwnerDataById($uid);
 999                 $profile = APContact::getByURL($owner['url']);
1000
1001                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1002
1003                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1004                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1005                         'type' => 'Announce',
1006                         'actor' => $owner['url'],
1007                         'object' => $suggestion['url'],
1008                         'content' => $suggestion['note'],
1009                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1010                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1011                         'cc' => []];
1012
1013                 $signed = LDSignature::sign($data, $owner);
1014
1015                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1016                 return HTTPSignature::transmit($signed, $inbox, $uid);
1017         }
1018
1019         /**
1020          * Transmits a profile deletion to a given inbox
1021          *
1022          * @param integer $uid User ID
1023          * @param string $inbox Target inbox
1024          *
1025          * @return boolean was the transmission successful?
1026          */
1027         public static function sendProfileDeletion($uid, $inbox)
1028         {
1029                 $owner = User::getOwnerDataById($uid);
1030                 $profile = APContact::getByURL($owner['url']);
1031
1032                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1033                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1034                         'type' => 'Delete',
1035                         'actor' => $owner['url'],
1036                         'object' => $owner['url'],
1037                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1038                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1039                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1040                         'cc' => []];
1041
1042                 $signed = LDSignature::sign($data, $owner);
1043
1044                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1045                 return HTTPSignature::transmit($signed, $inbox, $uid);
1046         }
1047
1048         /**
1049          * Transmits a profile change to a given inbox
1050          *
1051          * @param integer $uid User ID
1052          * @param string $inbox Target inbox
1053          *
1054          * @return boolean was the transmission successful?
1055          */
1056         public static function sendProfileUpdate($uid, $inbox)
1057         {
1058                 $owner = User::getOwnerDataById($uid);
1059                 $profile = APContact::getByURL($owner['url']);
1060
1061                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1062                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1063                         'type' => 'Update',
1064                         'actor' => $owner['url'],
1065                         'object' => self::getProfile($uid),
1066                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1067                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1068                         'to' => [$profile['followers']],
1069                         'cc' => []];
1070
1071                 $signed = LDSignature::sign($data, $owner);
1072
1073                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1074                 return HTTPSignature::transmit($signed, $inbox, $uid);
1075         }
1076
1077         /**
1078          * Transmits a given activity to a target
1079          *
1080          * @param array $activity
1081          * @param string $target Target profile
1082          * @param integer $uid User ID
1083          */
1084         public static function sendActivity($activity, $target, $uid)
1085         {
1086                 $profile = APContact::getByURL($target);
1087
1088                 $owner = User::getOwnerDataById($uid);
1089
1090                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1091                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1092                         'type' => $activity,
1093                         'actor' => $owner['url'],
1094                         'object' => $profile['url'],
1095                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1096                         'to' => $profile['url']];
1097
1098                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
1099
1100                 $signed = LDSignature::sign($data, $owner);
1101                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1102         }
1103
1104         /**
1105          * Transmit a message that the contact request had been accepted
1106          *
1107          * @param string $target Target profile
1108          * @param $id
1109          * @param integer $uid User ID
1110          */
1111         public static function sendContactAccept($target, $id, $uid)
1112         {
1113                 $profile = APContact::getByURL($target);
1114
1115                 $owner = User::getOwnerDataById($uid);
1116                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1117                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1118                         'type' => 'Accept',
1119                         'actor' => $owner['url'],
1120                         'object' => ['id' => $id, 'type' => 'Follow',
1121                                 'actor' => $profile['url'],
1122                                 'object' => $owner['url']],
1123                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1124                         'to' => $profile['url']];
1125
1126                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1127
1128                 $signed = LDSignature::sign($data, $owner);
1129                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1130         }
1131
1132         /**
1133          * Reject a contact request or terminates the contact relation
1134          *
1135          * @param string $target Target profile
1136          * @param $id
1137          * @param integer $uid User ID
1138          */
1139         public static function sendContactReject($target, $id, $uid)
1140         {
1141                 $profile = APContact::getByURL($target);
1142
1143                 $owner = User::getOwnerDataById($uid);
1144                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1145                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1146                         'type' => 'Reject',
1147                         'actor' => $owner['url'],
1148                         'object' => ['id' => $id, 'type' => 'Follow',
1149                                 'actor' => $profile['url'],
1150                                 'object' => $owner['url']],
1151                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1152                         'to' => $profile['url']];
1153
1154                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1155
1156                 $signed = LDSignature::sign($data, $owner);
1157                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1158         }
1159
1160         /**
1161          * Transmits a message that we don't want to follow this contact anymore
1162          *
1163          * @param string $target Target profile
1164          * @param integer $uid User ID
1165          */
1166         public static function sendContactUndo($target, $uid)
1167         {
1168                 $profile = APContact::getByURL($target);
1169
1170                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1171
1172                 $owner = User::getOwnerDataById($uid);
1173                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1174                         'id' => $id,
1175                         'type' => 'Undo',
1176                         'actor' => $owner['url'],
1177                         'object' => ['id' => $id, 'type' => 'Follow',
1178                                 'actor' => $owner['url'],
1179                                 'object' => $profile['url']],
1180                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1181                         'to' => $profile['url']];
1182
1183                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1184
1185                 $signed = LDSignature::sign($data, $owner);
1186                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1187         }
1188 }