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][] = $item_profile['followers'];
 285                                 }
 286                                 if (!in_array($receiver, $exclude)) {
 287                                         $permissions[$element][] = $receiver;
 288                                 }
 289                         }
 290                 }
 291                 return $permissions;
 292         }
 293
 294         /**
 295          * Creates an array of permissions from an item thread
 296          *
 297          * @param array $item
 298          * @param boolean $blindcopy
 299          *
 300          * @return array with permission data
 301          */
 302         private static function createPermissionBlockForItem($item, $blindcopy)
 303         {
 304                 // Will be activated in a later step
 305                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 306
 307                 // For now only send to these contacts:
 308                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 309
 310                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 311
 312                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 313
 314                 $actor_profile = APContact::getByURL($item['author-link']);
 315
 316                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 317
 318                 if (!$item['private']) {
 319                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 320                         if (!empty($actor_profile['followers'])) {
 321                                 $data['cc'][] = $actor_profile['followers'];
 322                         }
 323
 324                         foreach ($terms as $term) {
 325                                 $profile = APContact::getByURL($term['url'], false);
 326                                 if (!empty($profile)) {
 327                                         $data['to'][] = $profile['url'];
 328                                 }
 329                         }
 330                 } else {
 331                         $receiver_list = Item::enumeratePermissions($item);
 332
 333                         $mentioned = [];
 334
 335                         foreach ($terms as $term) {
 336                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 337                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 338                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 339                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 340                                                 $data['to'][] = $profile['url'];
 341                                         }
 342                                 }
 343                         }
 344
 345                         foreach ($receiver_list as $receiver) {
 346                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => $networks]);
 347                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 348                                         // BCC is currently deactivated, due to Pleroma and Mastodon not reacting like expected
 349                                         // $data['bcc'][] = $profile['url'];
 350                                         $data['cc'][] = $profile['url'];
 351                                 }
 352                         }
 353                 }
 354
 355                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 356                 while ($parent = Item::fetch($parents)) {
 357                         // Don't include data from future posts
 358                         if ($parent['id'] >= $item['id']) {
 359                                 continue;
 360                         }
 361
 362                         $profile = APContact::getByURL($parent['author-link'], false);
 363                         if (!empty($profile)) {
 364                                 if ($parent['uri'] == $item['thr-parent']) {
 365                                         $data['to'][] = $profile['url'];
 366                                 } else {
 367                                         $data['cc'][] = $profile['url'];
 368                                 }
 369                         }
 370
 371                         if ($item['gravity'] != GRAVITY_PARENT) {
 372                                 continue;
 373                         }
 374
 375                         $profile = APContact::getByURL($parent['owner-link'], false);
 376                         if (!empty($profile)) {
 377                                 $data['cc'][] = $profile['url'];
 378                         }
 379                 }
 380                 DBA::close($parents);
 381
 382                 $data['to'] = array_unique($data['to']);
 383                 $data['cc'] = array_unique($data['cc']);
 384                 $data['bcc'] = array_unique($data['bcc']);
 385
 386                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 387                         unset($data['to'][$key]);
 388                 }
 389
 390                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 391                         unset($data['cc'][$key]);
 392                 }
 393
 394                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 395                         unset($data['bcc'][$key]);
 396                 }
 397
 398                 foreach ($data['to'] as $to) {
 399                         if (($key = array_search($to, $data['cc'])) !== false) {
 400                                 unset($data['cc'][$key]);
 401                         }
 402
 403                         if (($key = array_search($to, $data['bcc'])) !== false) {
 404                                 unset($data['bcc'][$key]);
 405                         }
 406                 }
 407
 408                 foreach ($data['cc'] as $cc) {
 409                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 410                                 unset($data['bcc'][$key]);
 411                         }
 412                 }
 413
 414                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 415
 416                 if (!$blindcopy) {
 417                         unset($receivers['bcc']);
 418                 }
 419
 420                 return $receivers;
 421         }
 422
 423         /**
 424          * Fetches a list of inboxes of followers of a given user
 425          *
 426          * @param integer $uid User ID
 427          * @param boolean $personal fetch personal inboxes
 428          *
 429          * @return array of follower inboxes
 430          */
 431         public static function fetchTargetInboxesforUser($uid, $personal = false)
 432         {
 433                 $inboxes = [];
 434
 435                 // Will be activated in a later step
 436                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 437
 438                 // For now only send to these contacts:
 439                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 440
 441                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 442
 443                 if (!empty($uid)) {
 444                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 445                 }
 446
 447                 $contacts = DBA::select('contact', ['url'], $condition);
 448                 while ($contact = DBA::fetch($contacts)) {
 449                         $profile = APContact::getByURL($contact['url'], false);
 450                         if (!empty($profile)) {
 451                                 if (empty($profile['sharedinbox']) || $personal) {
 452                                         $target = $profile['inbox'];
 453                                 } else {
 454                                         $target = $profile['sharedinbox'];
 455                                 }
 456                                 $inboxes[$target] = $target;
 457                         }
 458                 }
 459                 DBA::close($contacts);
 460
 461                 return $inboxes;
 462         }
 463
 464         /**
 465          * Fetches an array of inboxes for the given item and user
 466          *
 467          * @param array $item
 468          * @param integer $uid User ID
 469          * @param boolean $personal fetch personal inboxes
 470          *
 471          * @return array with inboxes
 472          */
 473         public static function fetchTargetInboxes($item, $uid, $personal = false)
 474         {
 475                 $permissions = self::createPermissionBlockForItem($item, true);
 476                 if (empty($permissions)) {
 477                         return [];
 478                 }
 479
 480                 $inboxes = [];
 481
 482                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 483                         $item_profile = APContact::getByURL($item['author-link'], false);
 484                 } else {
 485                         $item_profile = APContact::getByURL($item['owner-link'], false);
 486                 }
 487
 488                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 489                         if (empty($permissions[$element])) {
 490                                 continue;
 491                         }
 492
 493                         $blindcopy = in_array($element, ['bto', 'bcc']);
 494
 495                         foreach ($permissions[$element] as $receiver) {
 496                                 if ($receiver == $item_profile['followers']) {
 497                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 498                                 } else {
 499                                         $profile = APContact::getByURL($receiver, false);
 500                                         if (!empty($profile)) {
 501                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 502                                                         $target = $profile['inbox'];
 503                                                 } else {
 504                                                         $target = $profile['sharedinbox'];
 505                                                 }
 506                                                 $inboxes[$target] = $target;
 507                                         }
 508                                 }
 509                         }
 510                 }
 511
 512                 return $inboxes;
 513         }
 514
 515         /**
 516          * Returns the activity type of a given item
 517          *
 518          * @param array $item
 519          *
 520          * @return string with activity type
 521          */
 522         private static function getTypeOfItem($item)
 523         {
 524                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 525                         $type = 'Announce';
 526                 } elseif ($item['verb'] == ACTIVITY_POST) {
 527                         if ($item['created'] == $item['edited']) {
 528                                 $type = 'Create';
 529                         } else {
 530                                 $type = 'Update';
 531                         }
 532                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 533                         $type = 'Like';
 534                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 535                         $type = 'Dislike';
 536                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 537                         $type = 'Accept';
 538                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 539                         $type = 'Reject';
 540                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 541                         $type = 'TentativeAccept';
 542                 } else {
 543                         $type = '';
 544                 }
 545
 546                 return $type;
 547         }
 548
 549         /**
 550          * Creates the activity or fetches it from the cache
 551          *
 552          * @param integer $item_id
 553          *
 554          * @return array with the activity
 555          */
 556         public static function createCachedActivityFromItem($item_id)
 557         {
 558                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 559                 $data = Cache::get($cachekey);
 560                 if (!is_null($data)) {
 561                         return $data;
 562                 }
 563
 564                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 565
 566                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 567                 return $data;
 568         }
 569
 570         /**
 571          * Creates an activity array for a given item id
 572          *
 573          * @param integer $item_id
 574          * @param boolean $object_mode Is the activity item is used inside another object?
 575          *
 576          * @return array of activity
 577          */
 578         public static function createActivityFromItem($item_id, $object_mode = false)
 579         {
 580                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 581
 582                 if (!DBA::isResult($item)) {
 583                         return false;
 584                 }
 585
 586                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 587                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 588                 if (DBA::isResult($conversation)) {
 589                         $data = json_decode($conversation['source']);
 590                         if (!empty($data)) {
 591                                 return $data;
 592                         }
 593                 }
 594
 595                 $type = self::getTypeOfItem($item);
 596
 597                 if (!$object_mode) {
 598                         $data = ['@context' => ActivityPub::CONTEXT];
 599
 600                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 601                                 $type = 'Undo';
 602                         } elseif ($item['deleted']) {
 603                                 $type = 'Delete';
 604                         }
 605                 } else {
 606                         $data = [];
 607                 }
 608
 609                 $data['id'] = $item['uri'] . '#' . $type;
 610                 $data['type'] = $type;
 611                 $data['actor'] = $item['owner-link'];
 612
 613                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 614
 615                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 616
 617                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 618
 619                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 620                         $data['object'] = self::createNote($item);
 621                 } elseif ($data['type'] == 'Announce') {
 622                         $data['object'] = self::createAnnounce($item);
 623                 } elseif ($data['type'] == 'Undo') {
 624                         $data['object'] = self::createActivityFromItem($item_id, true);
 625                 } else {
 626                         $data['diaspora:guid'] = $item['guid'];
 627                         $data['object'] = $item['thr-parent'];
 628                 }
 629
 630                 $owner = User::getOwnerDataById($item['uid']);
 631
 632                 if (!$object_mode) {
 633                         return LDSignature::sign($data, $owner);
 634                 } else {
 635                         return $data;
 636                 }
 637
 638                 /// @todo Create "conversation" entry
 639         }
 640
 641         /**
 642          * Creates an object array for a given item id
 643          *
 644          * @param integer $item_id
 645          *
 646          * @return array with the object data
 647          */
 648         public static function createObjectFromItemID($item_id)
 649         {
 650                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 651
 652                 if (!DBA::isResult($item)) {
 653                         return false;
 654                 }
 655
 656                 $data = ['@context' => ActivityPub::CONTEXT];
 657                 $data = array_merge($data, self::createNote($item));
 658
 659                 return $data;
 660         }
 661
 662         /**
 663          * Creates a location entry for a given item array
 664          *
 665          * @param array $item
 666          *
 667          * @return array with location array
 668          */
 669         private static function createLocation($item)
 670         {
 671                 $location = ['type' => 'Place'];
 672
 673                 if (!empty($item['location'])) {
 674                         $location['name'] = $item['location'];
 675                 }
 676
 677                 $coord = [];
 678
 679                 if (empty($item['coord'])) {
 680                         $coord = Map::getCoordinates($item['location']);
 681                 } else {
 682                         $coords = explode(' ', $item['coord']);
 683                         if (count($coords) == 2) {
 684                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 685                         }
 686                 }
 687
 688                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 689                         $location['latitude'] = $coord['lat'];
 690                         $location['longitude'] = $coord['lon'];
 691                 }
 692
 693                 return $location;
 694         }
 695
 696         /**
 697          * Returns a tag array for a given item array
 698          *
 699          * @param array $item
 700          *
 701          * @return array of tags
 702          */
 703         private static function createTagList($item)
 704         {
 705                 $tags = [];
 706
 707                 $terms = Term::tagArrayFromItemId($item['id']);
 708                 foreach ($terms as $term) {
 709                         if ($term['type'] == TERM_HASHTAG) {
 710                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 711                         } elseif ($term['type'] == TERM_MENTION) {
 712                                 $contact = Contact::getDetailsByURL($term['url']);
 713                                 if (!empty($contact['addr'])) {
 714                                         $mention = '@' . $contact['addr'];
 715                                 } else {
 716                                         $mention = '@' . $term['url'];
 717                                 }
 718
 719                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 720                         }
 721                 }
 722                 return $tags;
 723         }
 724
 725         /**
 726          * Adds attachment data to the JSON document
 727          *
 728          * @param array $item Data of the item that is to be posted
 729          * @param text $type Object type
 730          *
 731          * @return array with attachment data
 732          */
 733         private static function createAttachmentList($item, $type)
 734         {
 735                 $attachments = [];
 736
 737                 $arr = explode('[/attach],', $item['attach']);
 738                 if (count($arr)) {
 739                         foreach ($arr as $r) {
 740                                 $matches = false;
 741                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 742                                 if ($cnt) {
 743                                         $attributes = ['type' => 'Document',
 744                                                         'mediaType' => $matches[3],
 745                                                         'url' => $matches[1],
 746                                                         'name' => null];
 747
 748                                         if (trim($matches[4]) != '') {
 749                                                 $attributes['name'] = trim($matches[4]);
 750                                         }
 751
 752                                         $attachments[] = $attributes;
 753                                 }
 754                         }
 755                 }
 756
 757                 if ($type != 'Note') {
 758                         return $attachments;
 759                 }
 760
 761                 // Simplify image codes
 762                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 763
 764                 // Grab all pictures and create attachments out of them
 765                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 766                         foreach ($pictures[1] as $picture) {
 767                                 $imgdata = Image::getInfoFromURL($picture);
 768                                 if ($imgdata) {
 769                                         $attachments[] = ['type' => 'Document',
 770                                                 'mediaType' => $imgdata['mime'],
 771                                                 'url' => $picture,
 772                                                 'name' => null];
 773                                 }
 774                         }
 775                 }
 776
 777                 return $attachments;
 778         }
 779
 780         /**
 781          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 782          *
 783          * @param array $match Matching values for the callback
 784          * @return string Replaced mention
 785          */
 786         private static function mentionCallback($match)
 787         {
 788                 if (empty($match[1])) {
 789                         return;
 790                 }
 791
 792                 $data = Contact::getDetailsByURL($match[1]);
 793                 if (empty($data) || empty($data['nick'])) {
 794                         return;
 795                 }
 796
 797                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 798         }
 799
 800         /**
 801          * Remove image elements and replaces them with links to the image
 802          *
 803          * @param string $body
 804          *
 805          * @return string with replaced elements
 806          */
 807         private static function removePictures($body)
 808         {
 809                 // Simplify image codes
 810                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 811
 812                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 813                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 814
 815                 return $body;
 816         }
 817
 818         /**
 819          * Fetches the "context" value for a givem item array from the "conversation" table
 820          *
 821          * @param array $item
 822          *
 823          * @return string with context url
 824          */
 825         private static function fetchContextURLForItem($item)
 826         {
 827                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 828                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 829                         $context_uri = $conversation['conversation-href'];
 830                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 831                         $context_uri = $conversation['conversation-uri'];
 832                 } else {
 833                         $context_uri = $item['parent-uri'] . '#context';
 834                 }
 835                 return $context_uri;
 836         }
 837
 838         /**
 839          * Returns if the post contains sensitive content ("nsfw")
 840          *
 841          * @param integer $item_id
 842          *
 843          * @return boolean
 844          */
 845         private static function isSensitive($item_id)
 846         {
 847                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 848                 return DBA::exists('term', $condition);
 849         }
 850
 851         /**
 852          * Creates event data
 853          *
 854          * @param array $item
 855          *
 856          * @return array with the event data
 857          */
 858         public static function createEvent($item)
 859         {
 860                 $event = [];
 861                 $event['name'] = $item['event-summary'];
 862                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 863                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 864
 865                 if (!$item['event-nofinish']) {
 866                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 867                 }
 868
 869                 if (!empty($item['event-location'])) {
 870                         $item['location'] = $item['event-location'];
 871                         $event['location'] = self::createLocation($item);
 872                 }
 873
 874                 return $event;
 875         }
 876
 877         /**
 878          * Creates a note/article object array
 879          *
 880          * @param array $item
 881          *
 882          * @return array with the object data
 883          */
 884         public static function createNote($item)
 885         {
 886                 if ($item['event-type'] == 'event') {
 887                         $type = 'Event';
 888                 } elseif (!empty($item['title'])) {
 889                         $type = 'Article';
 890                 } else {
 891                         $type = 'Note';
 892                 }
 893
 894                 if ($item['deleted']) {
 895                         $type = 'Tombstone';
 896                 }
 897
 898                 $data = [];
 899                 $data['id'] = $item['uri'];
 900                 $data['type'] = $type;
 901
 902                 if ($item['deleted']) {
 903                         return $data;
 904                 }
 905
 906                 $data['summary'] = null; // Ignore by now
 907
 908                 if ($item['uri'] != $item['thr-parent']) {
 909                         $data['inReplyTo'] = $item['thr-parent'];
 910                 } else {
 911                         $data['inReplyTo'] = null;
 912                 }
 913
 914                 $data['diaspora:guid'] = $item['guid'];
 915                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 916
 917                 if ($item['created'] != $item['edited']) {
 918                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 919                 }
 920
 921                 $data['url'] = $item['plink'];
 922                 $data['attributedTo'] = $item['author-link'];
 923                 $data['sensitive'] = self::isSensitive($item['id']);
 924                 $data['context'] = self::fetchContextURLForItem($item);
 925
 926                 if (!empty($item['title'])) {
 927                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 928                 }
 929
 930                 $body = $item['body'];
 931
 932                 if ($type == 'Note') {
 933                         $body = self::removePictures($body);
 934                 }
 935
 936                 if ($type == 'Event') {
 937                         $data = array_merge($data, self::createEvent($item));
 938                 } else {
 939                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 940                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 941
 942                         $data['content'] = BBCode::convert($body, false, 7);
 943                 }
 944
 945                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 946
 947                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 948                         $data['diaspora:comment'] = $item['signed_text'];
 949                 }
 950
 951                 $data['attachment'] = self::createAttachmentList($item, $type);
 952                 $data['tag'] = self::createTagList($item);
 953
 954                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 955                         $data['location'] = self::createLocation($item);
 956                 }
 957
 958                 if (!empty($item['app'])) {
 959                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 960                 }
 961
 962                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 963
 964                 return $data;
 965         }
 966
 967         /**
 968          * Creates an announce object entry
 969          *
 970          * @param array $item
 971          *
 972          * @return string with announced object url
 973          */
 974         public static function createAnnounce($item)
 975         {
 976                 $announce = api_share_as_retweet($item);
 977                 if (empty($announce['plink'])) {
 978                         return self::createNote($item);
 979                 }
 980
 981                 return $announce['plink'];
 982         }
 983
 984         /**
 985          * Transmits a contact suggestion to a given inbox
 986          *
 987          * @param integer $uid User ID
 988          * @param string $inbox Target inbox
 989          * @param integer $suggestion_id Suggestion ID
 990          *
 991          * @return boolean was the transmission successful?
 992          */
 993         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 994         {
 995                 $owner = User::getOwnerDataById($uid);
 996                 $profile = APContact::getByURL($owner['url']);
 997
 998                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 999
1000                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1001                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1002                         'type' => 'Announce',
1003                         'actor' => $owner['url'],
1004                         'object' => $suggestion['url'],
1005                         'content' => $suggestion['note'],
1006                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1007                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1008                         'cc' => []];
1009
1010                 $signed = LDSignature::sign($data, $owner);
1011
1012                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1013                 return HTTPSignature::transmit($signed, $inbox, $uid);
1014         }
1015
1016         /**
1017          * Transmits a profile deletion to a given inbox
1018          *
1019          * @param integer $uid User ID
1020          * @param string $inbox Target inbox
1021          *
1022          * @return boolean was the transmission successful?
1023          */
1024         public static function sendProfileDeletion($uid, $inbox)
1025         {
1026                 $owner = User::getOwnerDataById($uid);
1027                 $profile = APContact::getByURL($owner['url']);
1028
1029                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1030                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1031                         'type' => 'Delete',
1032                         'actor' => $owner['url'],
1033                         'object' => $owner['url'],
1034                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1035                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1036                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1037                         'cc' => []];
1038
1039                 $signed = LDSignature::sign($data, $owner);
1040
1041                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1042                 return HTTPSignature::transmit($signed, $inbox, $uid);
1043         }
1044
1045         /**
1046          * Transmits a profile change to a given inbox
1047          *
1048          * @param integer $uid User ID
1049          * @param string $inbox Target inbox
1050          *
1051          * @return boolean was the transmission successful?
1052          */
1053         public static function sendProfileUpdate($uid, $inbox)
1054         {
1055                 $owner = User::getOwnerDataById($uid);
1056                 $profile = APContact::getByURL($owner['url']);
1057
1058                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1059                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1060                         'type' => 'Update',
1061                         'actor' => $owner['url'],
1062                         'object' => self::getProfile($uid),
1063                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1064                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1065                         'to' => [$profile['followers']],
1066                         'cc' => []];
1067
1068                 $signed = LDSignature::sign($data, $owner);
1069
1070                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
1071                 return HTTPSignature::transmit($signed, $inbox, $uid);
1072         }
1073
1074         /**
1075          * Transmits a given activity to a target
1076          *
1077          * @param array $activity
1078          * @param string $target Target profile
1079          * @param integer $uid User ID
1080          */
1081         public static function sendActivity($activity, $target, $uid)
1082         {
1083                 $profile = APContact::getByURL($target);
1084
1085                 $owner = User::getOwnerDataById($uid);
1086
1087                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1088                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1089                         'type' => $activity,
1090                         'actor' => $owner['url'],
1091                         'object' => $profile['url'],
1092                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1093                         'to' => $profile['url']];
1094
1095                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
1096
1097                 $signed = LDSignature::sign($data, $owner);
1098                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1099         }
1100
1101         /**
1102          * Transmit a message that the contact request had been accepted
1103          *
1104          * @param string $target Target profile
1105          * @param $id
1106          * @param integer $uid User ID
1107          */
1108         public static function sendContactAccept($target, $id, $uid)
1109         {
1110                 $profile = APContact::getByURL($target);
1111
1112                 $owner = User::getOwnerDataById($uid);
1113                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1114                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1115                         'type' => 'Accept',
1116                         'actor' => $owner['url'],
1117                         'object' => ['id' => $id, 'type' => 'Follow',
1118                                 'actor' => $profile['url'],
1119                                 'object' => $owner['url']],
1120                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1121                         'to' => $profile['url']];
1122
1123                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1124
1125                 $signed = LDSignature::sign($data, $owner);
1126                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1127         }
1128
1129         /**
1130          * Reject a contact request or terminates the contact relation
1131          *
1132          * @param string $target Target profile
1133          * @param $id
1134          * @param integer $uid User ID
1135          */
1136         public static function sendContactReject($target, $id, $uid)
1137         {
1138                 $profile = APContact::getByURL($target);
1139
1140                 $owner = User::getOwnerDataById($uid);
1141                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1142                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1143                         'type' => 'Reject',
1144                         'actor' => $owner['url'],
1145                         'object' => ['id' => $id, 'type' => 'Follow',
1146                                 'actor' => $profile['url'],
1147                                 'object' => $owner['url']],
1148                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1149                         'to' => $profile['url']];
1150
1151                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1152
1153                 $signed = LDSignature::sign($data, $owner);
1154                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1155         }
1156
1157         /**
1158          * Transmits a message that we don't want to follow this contact anymore
1159          *
1160          * @param string $target Target profile
1161          * @param integer $uid User ID
1162          */
1163         public static function sendContactUndo($target, $uid)
1164         {
1165                 $profile = APContact::getByURL($target);
1166
1167                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1168
1169                 $owner = User::getOwnerDataById($uid);
1170                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1171                         'id' => $id,
1172                         'type' => 'Undo',
1173                         'actor' => $owner['url'],
1174                         'object' => ['id' => $id, 'type' => 'Follow',
1175                                 'actor' => $owner['url'],
1176                                 'object' => $profile['url']],
1177                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1178                         'to' => $profile['url']];
1179
1180                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1181
1182                 $signed = LDSignature::sign($data, $owner);
1183                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1184         }
1185 }