src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Core\Logger;
  10 use Friendica\Core\System;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\APContact;
  16 use Friendica\Model\Item;
  17 use Friendica\Model\Term;
  18 use Friendica\Model\User;
  19 use Friendica\Util\DateTimeFormat;
  20 use Friendica\Content\Text\BBCode;
  21 use Friendica\Util\JsonLD;
  22 use Friendica\Util\LDSignature;
  23 use Friendica\Model\Profile;
  24 use Friendica\Core\Config;
  25 use Friendica\Object\Image;
  26 use Friendica\Protocol\ActivityPub;
  27 use Friendica\Protocol\Diaspora;
  28 use Friendica\Core\Cache;
  29 use Friendica\Util\Map;
  30
  31 require_once 'include/api.php';
  32
  33 /**
  34  * @brief ActivityPub Transmitter Protocol class
  35  *
  36  * To-Do:
  37  * - Undo Announce
  38  */
  39 class Transmitter
  40 {
  41         /**
  42          * collects the lost of followers of the given owner
  43          *
  44          * @param array $owner Owner array
  45          * @param integer $page Page number
  46          *
  47          * @return array of owners
  48          */
  49         public static function getFollowers($owner, $page = null)
  50         {
  51                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  52                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  53                 $count = DBA::count('contact', $condition);
  54
  55                 $data = ['@context' => ActivityPub::CONTEXT];
  56                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  57                 $data['type'] = 'OrderedCollection';
  58                 $data['totalItems'] = $count;
  59
  60                 // When we hide our friends we will only show the pure number but don't allow more.
  61                 $profile = Profile::getByUID($owner['uid']);
  62                 if (!empty($profile['hide-friends'])) {
  63                         return $data;
  64                 }
  65
  66                 if (empty($page)) {
  67                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  68                 } else {
  69                         $list = [];
  70
  71                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  72                         while ($contact = DBA::fetch($contacts)) {
  73                                 $list[] = $contact['url'];
  74                         }
  75
  76                         if (!empty($list)) {
  77                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  78                         }
  79
  80                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  81
  82                         $data['orderedItems'] = $list;
  83                 }
  84
  85                 return $data;
  86         }
  87
  88         /**
  89          * Create list of following contacts
  90          *
  91          * @param array $owner Owner array
  92          * @param integer $page Page numbe
  93          *
  94          * @return array of following contacts
  95          */
  96         public static function getFollowing($owner, $page = null)
  97         {
  98                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  99                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 100                 $count = DBA::count('contact', $condition);
 101
 102                 $data = ['@context' => ActivityPub::CONTEXT];
 103                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 104                 $data['type'] = 'OrderedCollection';
 105                 $data['totalItems'] = $count;
 106
 107                 // When we hide our friends we will only show the pure number but don't allow more.
 108                 $profile = Profile::getByUID($owner['uid']);
 109                 if (!empty($profile['hide-friends'])) {
 110                         return $data;
 111                 }
 112
 113                 if (empty($page)) {
 114                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 115                 } else {
 116                         $list = [];
 117
 118                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 119                         while ($contact = DBA::fetch($contacts)) {
 120                                 $list[] = $contact['url'];
 121                         }
 122
 123                         if (!empty($list)) {
 124                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 125                         }
 126
 127                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 128
 129                         $data['orderedItems'] = $list;
 130                 }
 131
 132                 return $data;
 133         }
 134
 135         /**
 136          * Public posts for the given owner
 137          *
 138          * @param array $owner Owner array
 139          * @param integer $page Page numbe
 140          *
 141          * @return array of posts
 142          */
 143         public static function getOutbox($owner, $page = null)
 144         {
 145                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 146
 147                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 148                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 149                         'deleted' => false, 'visible' => true];
 150                 $count = DBA::count('item', $condition);
 151
 152                 $data = ['@context' => ActivityPub::CONTEXT];
 153                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 154                 $data['type'] = 'OrderedCollection';
 155                 $data['totalItems'] = $count;
 156
 157                 if (empty($page)) {
 158                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 159                 } else {
 160                         $list = [];
 161
 162                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 163
 164                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 165                         while ($item = Item::fetch($items)) {
 166                                 $object = self::createObjectFromItemID($item['id']);
 167                                 unset($object['@context']);
 168                                 $list[] = $object;
 169                         }
 170
 171                         if (!empty($list)) {
 172                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 173                         }
 174
 175                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 176
 177                         $data['orderedItems'] = $list;
 178                 }
 179
 180                 return $data;
 181         }
 182
 183         /**
 184          * Return the ActivityPub profile of the given user
 185          *
 186          * @param integer $uid User ID
 187          * @return array with profile data
 188          */
 189         public static function getProfile($uid)
 190         {
 191                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 192                         'account_removed' => false, 'verified' => true];
 193                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 194                 $user = DBA::selectFirst('user', $fields, $condition);
 195                 if (!DBA::isResult($user)) {
 196                         return [];
 197                 }
 198
 199                 $fields = ['locality', 'region', 'country-name'];
 200                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 201                 if (!DBA::isResult($profile)) {
 202                         return [];
 203                 }
 204
 205                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 206                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 207                 if (!DBA::isResult($contact)) {
 208                         return [];
 209                 }
 210
 211                 // On old installations and never changed contacts this might not be filled
 212                 if (empty($contact['avatar'])) {
 213                         $contact['avatar'] = $contact['photo'];
 214                 }
 215
 216                 $data = ['@context' => ActivityPub::CONTEXT];
 217                 $data['id'] = $contact['url'];
 218                 $data['diaspora:guid'] = $user['guid'];
 219                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 220                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 221                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 222                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 223                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 224                 $data['preferredUsername'] = $user['nickname'];
 225                 $data['name'] = $contact['name'];
 226                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 227                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 228                 $data['summary'] = $contact['about'];
 229                 $data['url'] = $contact['url'];
 230                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 231                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 232                         'owner' => $contact['url'],
 233                         'publicKeyPem' => $user['pubkey']];
 234                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 235                 $data['icon'] = ['type' => 'Image',
 236                         'url' => $contact['avatar']];
 237
 238                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 239                 return $data;
 240         }
 241
 242         /**
 243          * Returns an array with permissions of a given item array
 244          *
 245          * @param array $item
 246          *
 247          * @return array with permissions
 248          */
 249         private static function fetchPermissionBlockFromConversation($item)
 250         {
 251                 if (empty($item['thr-parent'])) {
 252                         return [];
 253                 }
 254
 255                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 256                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 257                 if (!DBA::isResult($conversation)) {
 258                         return [];
 259                 }
 260
 261                 $activity = json_decode($conversation['source'], true);
 262
 263                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 264                 $profile = APContact::getByURL($actor);
 265
 266                 $item_profile = APContact::getByURL($item['author-link']);
 267                 $exclude[] = $item['author-link'];
 268
 269                 if ($item['gravity'] == GRAVITY_PARENT) {
 270                         $exclude[] = $item['owner-link'];
 271                 }
 272
 273                 $permissions['to'][] = $actor;
 274
 275                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 276                         if (empty($activity[$element])) {
 277                                 continue;
 278                         }
 279                         if (is_string($activity[$element])) {
 280                                 $activity[$element] = [$activity[$element]];
 281                         }
 282
 283                         foreach ($activity[$element] as $receiver) {
 284                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 285                                         $permissions[$element][] = $item_profile['followers'];
 286                                 } elseif (!in_array($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                 $actor_profile = APContact::getByURL($item['author-link']);
 313
 314                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 315
 316                 if (!$item['private']) {
 317                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 318
 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          * @param boolean $force   Force new cache entry
 554          *
 555          * @return array with the activity
 556          */
 557         public static function createCachedActivityFromItem($item_id, $force = false)
 558         {
 559                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 560
 561                 if (!$force) {
 562                         $data = Cache::get($cachekey);
 563                         if (!is_null($data)) {
 564                                 return $data;
 565                         }
 566                 }
 567
 568                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 569
 570                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 571                 return $data;
 572         }
 573
 574         /**
 575          * Creates an activity array for a given item id
 576          *
 577          * @param integer $item_id
 578          * @param boolean $object_mode Is the activity item is used inside another object?
 579          *
 580          * @return array of activity
 581          */
 582         public static function createActivityFromItem($item_id, $object_mode = false)
 583         {
 584                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 585
 586                 if (!DBA::isResult($item)) {
 587                         return false;
 588                 }
 589
 590                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 591                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 592                 if (DBA::isResult($conversation)) {
 593                         $data = json_decode($conversation['source']);
 594                         if (!empty($data)) {
 595                                 return $data;
 596                         }
 597                 }
 598
 599                 $type = self::getTypeOfItem($item);
 600
 601                 if (!$object_mode) {
 602                         $data = ['@context' => ActivityPub::CONTEXT];
 603
 604                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 605                                 $type = 'Undo';
 606                         } elseif ($item['deleted']) {
 607                                 $type = 'Delete';
 608                         }
 609                 } else {
 610                         $data = [];
 611                 }
 612
 613                 $data['id'] = $item['uri'] . '#' . $type;
 614                 $data['type'] = $type;
 615                 $data['actor'] = $item['owner-link'];
 616
 617                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 618
 619                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 620
 621                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 622
 623                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 624                         $data['object'] = self::createNote($item);
 625                 } elseif ($data['type'] == 'Announce') {
 626                         $data['object'] = self::createAnnounce($item);
 627                 } elseif ($data['type'] == 'Undo') {
 628                         $data['object'] = self::createActivityFromItem($item_id, true);
 629                 } else {
 630                         $data['diaspora:guid'] = $item['guid'];
 631                         if (!empty($item['signed_text'])) {
 632                                 $data['diaspora:like'] = $item['signed_text'];
 633                         }
 634                         $data['object'] = $item['thr-parent'];
 635                 }
 636
 637                 $owner = User::getOwnerDataById($item['uid']);
 638
 639                 if (!$object_mode) {
 640                         return LDSignature::sign($data, $owner);
 641                 } else {
 642                         return $data;
 643                 }
 644
 645                 /// @todo Create "conversation" entry
 646         }
 647
 648         /**
 649          * Creates an object array for a given item id
 650          *
 651          * @param integer $item_id
 652          *
 653          * @return array with the object data
 654          */
 655         public static function createObjectFromItemID($item_id)
 656         {
 657                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 658
 659                 if (!DBA::isResult($item)) {
 660                         return false;
 661                 }
 662
 663                 $data = ['@context' => ActivityPub::CONTEXT];
 664                 $data = array_merge($data, self::createNote($item));
 665
 666                 return $data;
 667         }
 668
 669         /**
 670          * Creates a location entry for a given item array
 671          *
 672          * @param array $item
 673          *
 674          * @return array with location array
 675          */
 676         private static function createLocation($item)
 677         {
 678                 $location = ['type' => 'Place'];
 679
 680                 if (!empty($item['location'])) {
 681                         $location['name'] = $item['location'];
 682                 }
 683
 684                 $coord = [];
 685
 686                 if (empty($item['coord'])) {
 687                         $coord = Map::getCoordinates($item['location']);
 688                 } else {
 689                         $coords = explode(' ', $item['coord']);
 690                         if (count($coords) == 2) {
 691                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 692                         }
 693                 }
 694
 695                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 696                         $location['latitude'] = $coord['lat'];
 697                         $location['longitude'] = $coord['lon'];
 698                 }
 699
 700                 return $location;
 701         }
 702
 703         /**
 704          * Returns a tag array for a given item array
 705          *
 706          * @param array $item
 707          *
 708          * @return array of tags
 709          */
 710         private static function createTagList($item)
 711         {
 712                 $tags = [];
 713
 714                 $terms = Term::tagArrayFromItemId($item['id']);
 715                 foreach ($terms as $term) {
 716                         if ($term['type'] == TERM_HASHTAG) {
 717                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 718                         } elseif ($term['type'] == TERM_MENTION) {
 719                                 $contact = Contact::getDetailsByURL($term['url']);
 720                                 if (!empty($contact['addr'])) {
 721                                         $mention = '@' . $contact['addr'];
 722                                 } else {
 723                                         $mention = '@' . $term['url'];
 724                                 }
 725
 726                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 727                         }
 728                 }
 729                 return $tags;
 730         }
 731
 732         /**
 733          * Adds attachment data to the JSON document
 734          *
 735          * @param array $item Data of the item that is to be posted
 736          * @param text $type Object type
 737          *
 738          * @return array with attachment data
 739          */
 740         private static function createAttachmentList($item, $type)
 741         {
 742                 $attachments = [];
 743
 744                 $arr = explode('[/attach],', $item['attach']);
 745                 if (count($arr)) {
 746                         foreach ($arr as $r) {
 747                                 $matches = false;
 748                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 749                                 if ($cnt) {
 750                                         $attributes = ['type' => 'Document',
 751                                                         'mediaType' => $matches[3],
 752                                                         'url' => $matches[1],
 753                                                         'name' => null];
 754
 755                                         if (trim($matches[4]) != '') {
 756                                                 $attributes['name'] = trim($matches[4]);
 757                                         }
 758
 759                                         $attachments[] = $attributes;
 760                                 }
 761                         }
 762                 }
 763
 764                 if ($type != 'Note') {
 765                         return $attachments;
 766                 }
 767
 768                 // Simplify image codes
 769                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 770
 771                 // Grab all pictures and create attachments out of them
 772                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 773                         foreach ($pictures[1] as $picture) {
 774                                 $imgdata = Image::getInfoFromURL($picture);
 775                                 if ($imgdata) {
 776                                         $attachments[] = ['type' => 'Document',
 777                                                 'mediaType' => $imgdata['mime'],
 778                                                 'url' => $picture,
 779                                                 'name' => null];
 780                                 }
 781                         }
 782                 }
 783
 784                 return $attachments;
 785         }
 786
 787         /**
 788          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 789          *
 790          * @param array $match Matching values for the callback
 791          * @return string Replaced mention
 792          */
 793         private static function mentionCallback($match)
 794         {
 795                 if (empty($match[1])) {
 796                         return;
 797                 }
 798
 799                 $data = Contact::getDetailsByURL($match[1]);
 800                 if (empty($data) || empty($data['nick'])) {
 801                         return;
 802                 }
 803
 804                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 805         }
 806
 807         /**
 808          * Remove image elements and replaces them with links to the image
 809          *
 810          * @param string $body
 811          *
 812          * @return string with replaced elements
 813          */
 814         private static function removePictures($body)
 815         {
 816                 // Simplify image codes
 817                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 818
 819                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 820                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 821
 822                 return $body;
 823         }
 824
 825         /**
 826          * Fetches the "context" value for a givem item array from the "conversation" table
 827          *
 828          * @param array $item
 829          *
 830          * @return string with context url
 831          */
 832         private static function fetchContextURLForItem($item)
 833         {
 834                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 835                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 836                         $context_uri = $conversation['conversation-href'];
 837                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 838                         $context_uri = $conversation['conversation-uri'];
 839                 } else {
 840                         $context_uri = $item['parent-uri'] . '#context';
 841                 }
 842                 return $context_uri;
 843         }
 844
 845         /**
 846          * Returns if the post contains sensitive content ("nsfw")
 847          *
 848          * @param integer $item_id
 849          *
 850          * @return boolean
 851          */
 852         private static function isSensitive($item_id)
 853         {
 854                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 855                 return DBA::exists('term', $condition);
 856         }
 857
 858         /**
 859          * Creates event data
 860          *
 861          * @param array $item
 862          *
 863          * @return array with the event data
 864          */
 865         public static function createEvent($item)
 866         {
 867                 $event = [];
 868                 $event['name'] = $item['event-summary'];
 869                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 870                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 871
 872                 if (!$item['event-nofinish']) {
 873                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 874                 }
 875
 876                 if (!empty($item['event-location'])) {
 877                         $item['location'] = $item['event-location'];
 878                         $event['location'] = self::createLocation($item);
 879                 }
 880
 881                 return $event;
 882         }
 883
 884         /**
 885          * Creates a note/article object array
 886          *
 887          * @param array $item
 888          *
 889          * @return array with the object data
 890          */
 891         public static function createNote($item)
 892         {
 893                 if ($item['event-type'] == 'event') {
 894                         $type = 'Event';
 895                 } elseif (!empty($item['title'])) {
 896                         $type = 'Article';
 897                 } else {
 898                         $type = 'Note';
 899                 }
 900
 901                 if ($item['deleted']) {
 902                         $type = 'Tombstone';
 903                 }
 904
 905                 $data = [];
 906                 $data['id'] = $item['uri'];
 907                 $data['type'] = $type;
 908
 909                 if ($item['deleted']) {
 910                         return $data;
 911                 }
 912
 913                 $data['summary'] = null; // Ignore by now
 914
 915                 if ($item['uri'] != $item['thr-parent']) {
 916                         $data['inReplyTo'] = $item['thr-parent'];
 917                 } else {
 918                         $data['inReplyTo'] = null;
 919                 }
 920
 921                 $data['diaspora:guid'] = $item['guid'];
 922                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 923
 924                 if ($item['created'] != $item['edited']) {
 925                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 926                 }
 927
 928                 $data['url'] = $item['plink'];
 929                 $data['attributedTo'] = $item['author-link'];
 930                 $data['sensitive'] = self::isSensitive($item['id']);
 931                 $data['context'] = self::fetchContextURLForItem($item);
 932
 933                 if (!empty($item['title'])) {
 934                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 935                 }
 936
 937                 $body = $item['body'];
 938
 939                 if ($type == 'Note') {
 940                         $body = self::removePictures($body);
 941                 }
 942
 943                 if ($type == 'Event') {
 944                         $data = array_merge($data, self::createEvent($item));
 945                 } else {
 946                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 947                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 948
 949                         $data['content'] = BBCode::convert($body, false, 7);
 950                 }
 951
 952                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 953
 954                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 955                         $data['diaspora:comment'] = $item['signed_text'];
 956                 }
 957
 958                 $data['attachment'] = self::createAttachmentList($item, $type);
 959                 $data['tag'] = self::createTagList($item);
 960
 961                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 962                         $data['location'] = self::createLocation($item);
 963                 }
 964
 965                 if (!empty($item['app'])) {
 966                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 967                 }
 968
 969                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 970
 971                 return $data;
 972         }
 973
 974         /**
 975          * Creates an announce object entry
 976          *
 977          * @param array $item
 978          *
 979          * @return string with announced object url
 980          */
 981         public static function createAnnounce($item)
 982         {
 983                 $announce = api_share_as_retweet($item);
 984                 if (empty($announce['plink'])) {
 985                         return self::createNote($item);
 986                 }
 987
 988                 return $announce['plink'];
 989         }
 990
 991         /**
 992          * Transmits a contact suggestion to a given inbox
 993          *
 994          * @param integer $uid User ID
 995          * @param string $inbox Target inbox
 996          * @param integer $suggestion_id Suggestion ID
 997          *
 998          * @return boolean was the transmission successful?
 999          */
1000         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1001         {
1002                 $owner = User::getOwnerDataById($uid);
1003                 $profile = APContact::getByURL($owner['url']);
1004
1005                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1006
1007                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1008                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1009                         'type' => 'Announce',
1010                         'actor' => $owner['url'],
1011                         'object' => $suggestion['url'],
1012                         'content' => $suggestion['note'],
1013                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1014                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1015                         'cc' => []];
1016
1017                 $signed = LDSignature::sign($data, $owner);
1018
1019                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1020                 return HTTPSignature::transmit($signed, $inbox, $uid);
1021         }
1022
1023         /**
1024          * Transmits a profile deletion to a given inbox
1025          *
1026          * @param integer $uid User ID
1027          * @param string $inbox Target inbox
1028          *
1029          * @return boolean was the transmission successful?
1030          */
1031         public static function sendProfileDeletion($uid, $inbox)
1032         {
1033                 $owner = User::getOwnerDataById($uid);
1034                 $profile = APContact::getByURL($owner['url']);
1035
1036                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1037                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1038                         'type' => 'Delete',
1039                         'actor' => $owner['url'],
1040                         'object' => $owner['url'],
1041                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1042                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1043                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1044                         'cc' => []];
1045
1046                 $signed = LDSignature::sign($data, $owner);
1047
1048                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1049                 return HTTPSignature::transmit($signed, $inbox, $uid);
1050         }
1051
1052         /**
1053          * Transmits a profile change to a given inbox
1054          *
1055          * @param integer $uid User ID
1056          * @param string $inbox Target inbox
1057          *
1058          * @return boolean was the transmission successful?
1059          */
1060         public static function sendProfileUpdate($uid, $inbox)
1061         {
1062                 $owner = User::getOwnerDataById($uid);
1063                 $profile = APContact::getByURL($owner['url']);
1064
1065                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1066                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1067                         'type' => 'Update',
1068                         'actor' => $owner['url'],
1069                         'object' => self::getProfile($uid),
1070                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1071                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1072                         'to' => [$profile['followers']],
1073                         'cc' => []];
1074
1075                 $signed = LDSignature::sign($data, $owner);
1076
1077                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1078                 return HTTPSignature::transmit($signed, $inbox, $uid);
1079         }
1080
1081         /**
1082          * Transmits a given activity to a target
1083          *
1084          * @param array $activity
1085          * @param string $target Target profile
1086          * @param integer $uid User ID
1087          */
1088         public static function sendActivity($activity, $target, $uid)
1089         {
1090                 $profile = APContact::getByURL($target);
1091
1092                 $owner = User::getOwnerDataById($uid);
1093
1094                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1095                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1096                         'type' => $activity,
1097                         'actor' => $owner['url'],
1098                         'object' => $profile['url'],
1099                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1100                         'to' => $profile['url']];
1101
1102                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1103
1104                 $signed = LDSignature::sign($data, $owner);
1105                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1106         }
1107
1108         /**
1109          * Transmit a message that the contact request had been accepted
1110          *
1111          * @param string $target Target profile
1112          * @param $id
1113          * @param integer $uid User ID
1114          */
1115         public static function sendContactAccept($target, $id, $uid)
1116         {
1117                 $profile = APContact::getByURL($target);
1118
1119                 $owner = User::getOwnerDataById($uid);
1120                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1121                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1122                         'type' => 'Accept',
1123                         'actor' => $owner['url'],
1124                         'object' => ['id' => $id, 'type' => 'Follow',
1125                                 'actor' => $profile['url'],
1126                                 'object' => $owner['url']],
1127                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1128                         'to' => $profile['url']];
1129
1130                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1131
1132                 $signed = LDSignature::sign($data, $owner);
1133                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1134         }
1135
1136         /**
1137          * Reject a contact request or terminates the contact relation
1138          *
1139          * @param string $target Target profile
1140          * @param $id
1141          * @param integer $uid User ID
1142          */
1143         public static function sendContactReject($target, $id, $uid)
1144         {
1145                 $profile = APContact::getByURL($target);
1146
1147                 $owner = User::getOwnerDataById($uid);
1148                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1149                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1150                         'type' => 'Reject',
1151                         'actor' => $owner['url'],
1152                         'object' => ['id' => $id, 'type' => 'Follow',
1153                                 'actor' => $profile['url'],
1154                                 'object' => $owner['url']],
1155                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1156                         'to' => $profile['url']];
1157
1158                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1159
1160                 $signed = LDSignature::sign($data, $owner);
1161                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1162         }
1163
1164         /**
1165          * Transmits a message that we don't want to follow this contact anymore
1166          *
1167          * @param string $target Target profile
1168          * @param integer $uid User ID
1169          */
1170         public static function sendContactUndo($target, $uid)
1171         {
1172                 $profile = APContact::getByURL($target);
1173
1174                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1175
1176                 $owner = User::getOwnerDataById($uid);
1177                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1178                         'id' => $id,
1179                         'type' => 'Undo',
1180                         'actor' => $owner['url'],
1181                         'object' => ['id' => $id, 'type' => 'Follow',
1182                                 'actor' => $owner['url'],
1183                                 'object' => $profile['url']],
1184                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1185                         'to' => $profile['url']];
1186
1187                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1188
1189                 $signed = LDSignature::sign($data, $owner);
1190                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1191         }
1192 }