src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Core\Logger;
  10 use Friendica\Core\System;
  11 use Friendica\Util\HTTPSignature;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Model\Conversation;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\APContact;
  16 use Friendica\Model\Item;
  17 use Friendica\Model\Term;
  18 use Friendica\Model\User;
  19 use Friendica\Util\DateTimeFormat;
  20 use Friendica\Content\Text\BBCode;
  21 use Friendica\Util\JsonLD;
  22 use Friendica\Util\LDSignature;
  23 use Friendica\Model\Profile;
  24 use Friendica\Core\Config;
  25 use Friendica\Object\Image;
  26 use Friendica\Protocol\ActivityPub;
  27 use Friendica\Protocol\Diaspora;
  28 use Friendica\Core\Cache;
  29 use Friendica\Util\Map;
  30 use Friendica\Util\Network;
  31
  32 require_once 'include/api.php';
  33
  34 /**
  35  * @brief ActivityPub Transmitter Protocol class
  36  *
  37  * To-Do:
  38  * - Undo Announce
  39  */
  40 class Transmitter
  41 {
  42         /**
  43          * collects the lost of followers of the given owner
  44          *
  45          * @param array $owner Owner array
  46          * @param integer $page Page number
  47          *
  48          * @return array of owners
  49          */
  50         public static function getFollowers($owner, $page = null)
  51         {
  52                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  53                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  54                 $count = DBA::count('contact', $condition);
  55
  56                 $data = ['@context' => ActivityPub::CONTEXT];
  57                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  58                 $data['type'] = 'OrderedCollection';
  59                 $data['totalItems'] = $count;
  60
  61                 // When we hide our friends we will only show the pure number but don't allow more.
  62                 $profile = Profile::getByUID($owner['uid']);
  63                 if (!empty($profile['hide-friends'])) {
  64                         return $data;
  65                 }
  66
  67                 if (empty($page)) {
  68                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  69                 } else {
  70                         $list = [];
  71
  72                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  73                         while ($contact = DBA::fetch($contacts)) {
  74                                 $list[] = $contact['url'];
  75                         }
  76
  77                         if (!empty($list)) {
  78                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  79                         }
  80
  81                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  82
  83                         $data['orderedItems'] = $list;
  84                 }
  85
  86                 return $data;
  87         }
  88
  89         /**
  90          * Create list of following contacts
  91          *
  92          * @param array $owner Owner array
  93          * @param integer $page Page numbe
  94          *
  95          * @return array of following contacts
  96          */
  97         public static function getFollowing($owner, $page = null)
  98         {
  99                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 100                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 101                 $count = DBA::count('contact', $condition);
 102
 103                 $data = ['@context' => ActivityPub::CONTEXT];
 104                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 105                 $data['type'] = 'OrderedCollection';
 106                 $data['totalItems'] = $count;
 107
 108                 // When we hide our friends we will only show the pure number but don't allow more.
 109                 $profile = Profile::getByUID($owner['uid']);
 110                 if (!empty($profile['hide-friends'])) {
 111                         return $data;
 112                 }
 113
 114                 if (empty($page)) {
 115                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 116                 } else {
 117                         $list = [];
 118
 119                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 120                         while ($contact = DBA::fetch($contacts)) {
 121                                 $list[] = $contact['url'];
 122                         }
 123
 124                         if (!empty($list)) {
 125                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 126                         }
 127
 128                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 129
 130                         $data['orderedItems'] = $list;
 131                 }
 132
 133                 return $data;
 134         }
 135
 136         /**
 137          * Public posts for the given owner
 138          *
 139          * @param array $owner Owner array
 140          * @param integer $page Page numbe
 141          *
 142          * @return array of posts
 143          */
 144         public static function getOutbox($owner, $page = null)
 145         {
 146                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 147
 148                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 149                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 150                         'deleted' => false, 'visible' => true];
 151                 $count = DBA::count('item', $condition);
 152
 153                 $data = ['@context' => ActivityPub::CONTEXT];
 154                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 155                 $data['type'] = 'OrderedCollection';
 156                 $data['totalItems'] = $count;
 157
 158                 if (empty($page)) {
 159                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 160                 } else {
 161                         $list = [];
 162
 163                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 164
 165                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 166                         while ($item = Item::fetch($items)) {
 167                                 $object = self::createObjectFromItemID($item['id']);
 168                                 unset($object['@context']);
 169                                 $list[] = $object;
 170                         }
 171
 172                         if (!empty($list)) {
 173                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 174                         }
 175
 176                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 177
 178                         $data['orderedItems'] = $list;
 179                 }
 180
 181                 return $data;
 182         }
 183
 184         /**
 185          * Return the ActivityPub profile of the given user
 186          *
 187          * @param integer $uid User ID
 188          * @return array with profile data
 189          */
 190         public static function getProfile($uid)
 191         {
 192                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 193                         'account_removed' => false, 'verified' => true];
 194                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 195                 $user = DBA::selectFirst('user', $fields, $condition);
 196                 if (!DBA::isResult($user)) {
 197                         return [];
 198                 }
 199
 200                 $fields = ['locality', 'region', 'country-name'];
 201                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 202                 if (!DBA::isResult($profile)) {
 203                         return [];
 204                 }
 205
 206                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 207                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 208                 if (!DBA::isResult($contact)) {
 209                         return [];
 210                 }
 211
 212                 // On old installations and never changed contacts this might not be filled
 213                 if (empty($contact['avatar'])) {
 214                         $contact['avatar'] = $contact['photo'];
 215                 }
 216
 217                 $data = ['@context' => ActivityPub::CONTEXT];
 218                 $data['id'] = $contact['url'];
 219                 $data['diaspora:guid'] = $user['guid'];
 220                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 221                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 222                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 223                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 224                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 225                 $data['preferredUsername'] = $user['nickname'];
 226                 $data['name'] = $contact['name'];
 227                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 228                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 229                 $data['summary'] = $contact['about'];
 230                 $data['url'] = $contact['url'];
 231                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 232                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 233                         'owner' => $contact['url'],
 234                         'publicKeyPem' => $user['pubkey']];
 235                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 236                 $data['icon'] = ['type' => 'Image',
 237                         'url' => $contact['avatar']];
 238
 239                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 240                 return $data;
 241         }
 242
 243         /**
 244          * Returns an array with permissions of a given item array
 245          *
 246          * @param array $item
 247          *
 248          * @return array with permissions
 249          */
 250         private static function fetchPermissionBlockFromConversation($item)
 251         {
 252                 if (empty($item['thr-parent'])) {
 253                         return [];
 254                 }
 255
 256                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 257                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 258                 if (!DBA::isResult($conversation)) {
 259                         return [];
 260                 }
 261
 262                 $activity = json_decode($conversation['source'], true);
 263
 264                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 265                 $profile = APContact::getByURL($actor);
 266
 267                 $item_profile = APContact::getByURL($item['author-link']);
 268                 $exclude[] = $item['author-link'];
 269
 270                 if ($item['gravity'] == GRAVITY_PARENT) {
 271                         $exclude[] = $item['owner-link'];
 272                 }
 273
 274                 $permissions['to'][] = $actor;
 275
 276                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 277                         if (empty($activity[$element])) {
 278                                 continue;
 279                         }
 280                         if (is_string($activity[$element])) {
 281                                 $activity[$element] = [$activity[$element]];
 282                         }
 283
 284                         foreach ($activity[$element] as $receiver) {
 285                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 286                                         $permissions[$element][] = $item_profile['followers'];
 287                                 } elseif (!in_array($receiver, $exclude)) {
 288                                         $permissions[$element][] = $receiver;
 289                                 }
 290                         }
 291                 }
 292                 return $permissions;
 293         }
 294
 295         /**
 296          * Creates an array of permissions from an item thread
 297          *
 298          * @param array $item
 299          * @param boolean $blindcopy
 300          * @param boolean $last_id
 301          *
 302          * @return array with permission data
 303          */
 304         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0)
 305         {
 306                 if ($last_id == 0) {
 307                         $last_id = $item['id'];
 308                 }
 309
 310                 $always_bcc = false;
 311
 312                 // Check if we should always deliver our stuff via BCC
 313                 if (!empty($item['uid'])) {
 314                         $profile = Profile::getByUID($item['uid']);
 315                         if (!empty($profile)) {
 316                                 $always_bcc = $profile['hide-friends'];
 317                         }
 318                 }
 319
 320                 // Will be activated in a later step
 321                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 322
 323                 // For now only send to these contacts:
 324                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 325
 326                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 327
 328                 $actor_profile = APContact::getByURL($item['author-link']);
 329
 330                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 331
 332                 if (!$item['private']) {
 333                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 334
 335                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 336                         if (!empty($actor_profile['followers'])) {
 337                                 $data['cc'][] = $actor_profile['followers'];
 338                         }
 339
 340                         foreach ($terms as $term) {
 341                                 $profile = APContact::getByURL($term['url'], false);
 342                                 if (!empty($profile)) {
 343                                         $data['to'][] = $profile['url'];
 344                                 }
 345                         }
 346                 } else {
 347                         $receiver_list = Item::enumeratePermissions($item);
 348
 349                         $mentioned = [];
 350
 351                         foreach ($terms as $term) {
 352                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 353                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 354                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 355                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 356                                                 $data['to'][] = $profile['url'];
 357                                         }
 358                                 }
 359                         }
 360
 361                         foreach ($receiver_list as $receiver) {
 362                                 $contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
 363                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 364                                         if ($contact['hidden'] || $always_bcc) {
 365                                                 $data['bcc'][] = $profile['url'];
 366                                         } else {
 367                                                 $data['cc'][] = $profile['url'];
 368                                         }
 369                                 }
 370                         }
 371                 }
 372
 373                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 374                 while ($parent = Item::fetch($parents)) {
 375                         // Don't include data from future posts
 376                         if ($parent['id'] >= $last_id) {
 377                                 continue;
 378                         }
 379
 380                         $profile = APContact::getByURL($parent['author-link'], false);
 381                         if (!empty($profile)) {
 382                                 if ($parent['uri'] == $item['thr-parent']) {
 383                                         $data['to'][] = $profile['url'];
 384                                 } else {
 385                                         $data['cc'][] = $profile['url'];
 386                                 }
 387                         }
 388
 389                         if ($item['gravity'] != GRAVITY_PARENT) {
 390                                 continue;
 391                         }
 392
 393                         $profile = APContact::getByURL($parent['owner-link'], false);
 394                         if (!empty($profile)) {
 395                                 $data['cc'][] = $profile['url'];
 396                         }
 397                 }
 398                 DBA::close($parents);
 399
 400                 $data['to'] = array_unique($data['to']);
 401                 $data['cc'] = array_unique($data['cc']);
 402                 $data['bcc'] = array_unique($data['bcc']);
 403
 404                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 405                         unset($data['to'][$key]);
 406                 }
 407
 408                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 409                         unset($data['cc'][$key]);
 410                 }
 411
 412                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 413                         unset($data['bcc'][$key]);
 414                 }
 415
 416                 foreach ($data['to'] as $to) {
 417                         if (($key = array_search($to, $data['cc'])) !== false) {
 418                                 unset($data['cc'][$key]);
 419                         }
 420
 421                         if (($key = array_search($to, $data['bcc'])) !== false) {
 422                                 unset($data['bcc'][$key]);
 423                         }
 424                 }
 425
 426                 foreach ($data['cc'] as $cc) {
 427                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 428                                 unset($data['bcc'][$key]);
 429                         }
 430                 }
 431
 432                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 433
 434                 if (!$blindcopy) {
 435                         unset($receivers['bcc']);
 436                 }
 437
 438                 return $receivers;
 439         }
 440
 441         /**
 442          * Fetches a list of inboxes of followers of a given user
 443          *
 444          * @param integer $uid User ID
 445          * @param boolean $personal fetch personal inboxes
 446          *
 447          * @return array of follower inboxes
 448          */
 449         public static function fetchTargetInboxesforUser($uid, $personal = false)
 450         {
 451                 $inboxes = [];
 452
 453                 // Will be activated in a later step
 454                 // $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 455
 456                 // For now only send to these contacts:
 457                 $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 458
 459                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 460
 461                 if (!empty($uid)) {
 462                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 463                 }
 464
 465                 $contacts = DBA::select('contact', ['url'], $condition);
 466                 while ($contact = DBA::fetch($contacts)) {
 467                         if (Network::isUrlBlocked($contact['url'])) {
 468                                 continue;
 469                         }
 470
 471                         $profile = APContact::getByURL($contact['url'], false);
 472                         if (!empty($profile)) {
 473                                 if (empty($profile['sharedinbox']) || $personal) {
 474                                         $target = $profile['inbox'];
 475                                 } else {
 476                                         $target = $profile['sharedinbox'];
 477                                 }
 478                                 $inboxes[$target] = $target;
 479                         }
 480                 }
 481                 DBA::close($contacts);
 482
 483                 return $inboxes;
 484         }
 485
 486         /**
 487          * Fetches an array of inboxes for the given item and user
 488          *
 489          * @param array $item
 490          * @param integer $uid User ID
 491          * @param boolean $personal fetch personal inboxes
 492          * @param integer $last_id Last item id for adding receivers
 493          *
 494          * @return array with inboxes
 495          */
 496         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0)
 497         {
 498                 $permissions = self::createPermissionBlockForItem($item, true, $last_id);
 499                 if (empty($permissions)) {
 500                         return [];
 501                 }
 502
 503                 $inboxes = [];
 504
 505                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 506                         $item_profile = APContact::getByURL($item['author-link'], false);
 507                 } else {
 508                         $item_profile = APContact::getByURL($item['owner-link'], false);
 509                 }
 510
 511                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 512                         if (empty($permissions[$element])) {
 513                                 continue;
 514                         }
 515
 516                         $blindcopy = in_array($element, ['bto', 'bcc']);
 517
 518                         foreach ($permissions[$element] as $receiver) {
 519                                 if (Network::isUrlBlocked($receiver)) {
 520                                         continue;
 521                                 }
 522
 523                                 if ($receiver == $item_profile['followers']) {
 524                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 525                                 } else {
 526                                         $profile = APContact::getByURL($receiver, false);
 527                                         if (!empty($profile)) {
 528                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 529                                                         $target = $profile['inbox'];
 530                                                 } else {
 531                                                         $target = $profile['sharedinbox'];
 532                                                 }
 533                                                 $inboxes[$target] = $target;
 534                                         }
 535                                 }
 536                         }
 537                 }
 538
 539                 return $inboxes;
 540         }
 541
 542         /**
 543          * Returns the activity type of a given item
 544          *
 545          * @param array $item
 546          *
 547          * @return string with activity type
 548          */
 549         private static function getTypeOfItem($item)
 550         {
 551                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 552                         $type = 'Announce';
 553                 } elseif ($item['verb'] == ACTIVITY_POST) {
 554                         if ($item['created'] == $item['edited']) {
 555                                 $type = 'Create';
 556                         } else {
 557                                 $type = 'Update';
 558                         }
 559                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 560                         $type = 'Like';
 561                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 562                         $type = 'Dislike';
 563                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 564                         $type = 'Accept';
 565                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 566                         $type = 'Reject';
 567                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 568                         $type = 'TentativeAccept';
 569                 } else {
 570                         $type = '';
 571                 }
 572
 573                 return $type;
 574         }
 575
 576         /**
 577          * Creates the activity or fetches it from the cache
 578          *
 579          * @param integer $item_id
 580          * @param boolean $force   Force new cache entry
 581          *
 582          * @return array with the activity
 583          */
 584         public static function createCachedActivityFromItem($item_id, $force = false)
 585         {
 586                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 587
 588                 if (!$force) {
 589                         $data = Cache::get($cachekey);
 590                         if (!is_null($data)) {
 591                                 return $data;
 592                         }
 593                 }
 594
 595                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 596
 597                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 598                 return $data;
 599         }
 600
 601         /**
 602          * Creates an activity array for a given item id
 603          *
 604          * @param integer $item_id
 605          * @param boolean $object_mode Is the activity item is used inside another object?
 606          *
 607          * @return array of activity
 608          */
 609         public static function createActivityFromItem($item_id, $object_mode = false)
 610         {
 611                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 612
 613                 if (!DBA::isResult($item)) {
 614                         return false;
 615                 }
 616
 617                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 618                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 619                 if (DBA::isResult($conversation)) {
 620                         $data = json_decode($conversation['source']);
 621                         if (!empty($data)) {
 622                                 return $data;
 623                         }
 624                 }
 625
 626                 $type = self::getTypeOfItem($item);
 627
 628                 if (!$object_mode) {
 629                         $data = ['@context' => ActivityPub::CONTEXT];
 630
 631                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 632                                 $type = 'Undo';
 633                         } elseif ($item['deleted']) {
 634                                 $type = 'Delete';
 635                         }
 636                 } else {
 637                         $data = [];
 638                 }
 639
 640                 $data['id'] = $item['uri'] . '#' . $type;
 641                 $data['type'] = $type;
 642                 $data['actor'] = $item['owner-link'];
 643
 644                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 645
 646                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 647
 648                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 649
 650                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 651                         $data['object'] = self::createNote($item);
 652                 } elseif ($data['type'] == 'Announce') {
 653                         $data['object'] = self::createAnnounce($item);
 654                 } elseif ($data['type'] == 'Undo') {
 655                         $data['object'] = self::createActivityFromItem($item_id, true);
 656                 } else {
 657                         $data['diaspora:guid'] = $item['guid'];
 658                         if (!empty($item['signed_text'])) {
 659                                 $data['diaspora:like'] = $item['signed_text'];
 660                         }
 661                         $data['object'] = $item['thr-parent'];
 662                 }
 663
 664                 if (!empty($item['contact-uid'])) {
 665                         $uid = $item['contact-uid'];
 666                 } else {
 667                         $uid = $item['uid'];
 668                 }
 669
 670                 $owner = User::getOwnerDataById($uid);
 671
 672                 if (!$object_mode && !empty($owner)) {
 673                         return LDSignature::sign($data, $owner);
 674                 } else {
 675                         return $data;
 676                 }
 677
 678                 /// @todo Create "conversation" entry
 679         }
 680
 681         /**
 682          * Creates an object array for a given item id
 683          *
 684          * @param integer $item_id
 685          *
 686          * @return array with the object data
 687          */
 688         public static function createObjectFromItemID($item_id)
 689         {
 690                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 691
 692                 if (!DBA::isResult($item)) {
 693                         return false;
 694                 }
 695
 696                 $data = ['@context' => ActivityPub::CONTEXT];
 697                 $data = array_merge($data, self::createNote($item));
 698
 699                 return $data;
 700         }
 701
 702         /**
 703          * Creates a location entry for a given item array
 704          *
 705          * @param array $item
 706          *
 707          * @return array with location array
 708          */
 709         private static function createLocation($item)
 710         {
 711                 $location = ['type' => 'Place'];
 712
 713                 if (!empty($item['location'])) {
 714                         $location['name'] = $item['location'];
 715                 }
 716
 717                 $coord = [];
 718
 719                 if (empty($item['coord'])) {
 720                         $coord = Map::getCoordinates($item['location']);
 721                 } else {
 722                         $coords = explode(' ', $item['coord']);
 723                         if (count($coords) == 2) {
 724                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 725                         }
 726                 }
 727
 728                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 729                         $location['latitude'] = $coord['lat'];
 730                         $location['longitude'] = $coord['lon'];
 731                 }
 732
 733                 return $location;
 734         }
 735
 736         /**
 737          * Returns a tag array for a given item array
 738          *
 739          * @param array $item
 740          *
 741          * @return array of tags
 742          */
 743         private static function createTagList($item)
 744         {
 745                 $tags = [];
 746
 747                 $terms = Term::tagArrayFromItemId($item['id']);
 748                 foreach ($terms as $term) {
 749                         if ($term['type'] == TERM_HASHTAG) {
 750                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 751                         } elseif ($term['type'] == TERM_MENTION) {
 752                                 $contact = Contact::getDetailsByURL($term['url']);
 753                                 if (!empty($contact['addr'])) {
 754                                         $mention = '@' . $contact['addr'];
 755                                 } else {
 756                                         $mention = '@' . $term['url'];
 757                                 }
 758
 759                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 760                         }
 761                 }
 762                 return $tags;
 763         }
 764
 765         /**
 766          * Adds attachment data to the JSON document
 767          *
 768          * @param array $item Data of the item that is to be posted
 769          * @param text $type Object type
 770          *
 771          * @return array with attachment data
 772          */
 773         private static function createAttachmentList($item, $type)
 774         {
 775                 $attachments = [];
 776
 777                 $arr = explode('[/attach],', $item['attach']);
 778                 if (count($arr)) {
 779                         foreach ($arr as $r) {
 780                                 $matches = false;
 781                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 782                                 if ($cnt) {
 783                                         $attributes = ['type' => 'Document',
 784                                                         'mediaType' => $matches[3],
 785                                                         'url' => $matches[1],
 786                                                         'name' => null];
 787
 788                                         if (trim($matches[4]) != '') {
 789                                                 $attributes['name'] = trim($matches[4]);
 790                                         }
 791
 792                                         $attachments[] = $attributes;
 793                                 }
 794                         }
 795                 }
 796
 797                 if ($type != 'Note') {
 798                         return $attachments;
 799                 }
 800
 801                 // Simplify image codes
 802                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 803
 804                 // Grab all pictures and create attachments out of them
 805                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 806                         foreach ($pictures[1] as $picture) {
 807                                 $imgdata = Image::getInfoFromURL($picture);
 808                                 if ($imgdata) {
 809                                         $attachments[] = ['type' => 'Document',
 810                                                 'mediaType' => $imgdata['mime'],
 811                                                 'url' => $picture,
 812                                                 'name' => null];
 813                                 }
 814                         }
 815                 }
 816
 817                 return $attachments;
 818         }
 819
 820         /**
 821          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 822          *
 823          * @param array $match Matching values for the callback
 824          * @return string Replaced mention
 825          */
 826         private static function mentionCallback($match)
 827         {
 828                 if (empty($match[1])) {
 829                         return;
 830                 }
 831
 832                 $data = Contact::getDetailsByURL($match[1]);
 833                 if (empty($data) || empty($data['nick'])) {
 834                         return;
 835                 }
 836
 837                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 838         }
 839
 840         /**
 841          * Remove image elements and replaces them with links to the image
 842          *
 843          * @param string $body
 844          *
 845          * @return string with replaced elements
 846          */
 847         private static function removePictures($body)
 848         {
 849                 // Simplify image codes
 850                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 851
 852                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 853                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 854
 855                 return $body;
 856         }
 857
 858         /**
 859          * Fetches the "context" value for a givem item array from the "conversation" table
 860          *
 861          * @param array $item
 862          *
 863          * @return string with context url
 864          */
 865         private static function fetchContextURLForItem($item)
 866         {
 867                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 868                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 869                         $context_uri = $conversation['conversation-href'];
 870                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 871                         $context_uri = $conversation['conversation-uri'];
 872                 } else {
 873                         $context_uri = $item['parent-uri'] . '#context';
 874                 }
 875                 return $context_uri;
 876         }
 877
 878         /**
 879          * Returns if the post contains sensitive content ("nsfw")
 880          *
 881          * @param integer $item_id
 882          *
 883          * @return boolean
 884          */
 885         private static function isSensitive($item_id)
 886         {
 887                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 888                 return DBA::exists('term', $condition);
 889         }
 890
 891         /**
 892          * Creates event data
 893          *
 894          * @param array $item
 895          *
 896          * @return array with the event data
 897          */
 898         public static function createEvent($item)
 899         {
 900                 $event = [];
 901                 $event['name'] = $item['event-summary'];
 902                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 903                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 904
 905                 if (!$item['event-nofinish']) {
 906                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 907                 }
 908
 909                 if (!empty($item['event-location'])) {
 910                         $item['location'] = $item['event-location'];
 911                         $event['location'] = self::createLocation($item);
 912                 }
 913
 914                 return $event;
 915         }
 916
 917         /**
 918          * Creates a note/article object array
 919          *
 920          * @param array $item
 921          *
 922          * @return array with the object data
 923          */
 924         public static function createNote($item)
 925         {
 926                 if ($item['event-type'] == 'event') {
 927                         $type = 'Event';
 928                 } elseif (!empty($item['title'])) {
 929                         $type = 'Article';
 930                 } else {
 931                         $type = 'Note';
 932                 }
 933
 934                 if ($item['deleted']) {
 935                         $type = 'Tombstone';
 936                 }
 937
 938                 $data = [];
 939                 $data['id'] = $item['uri'];
 940                 $data['type'] = $type;
 941
 942                 if ($item['deleted']) {
 943                         return $data;
 944                 }
 945
 946                 $data['summary'] = null; // Ignore by now
 947
 948                 if ($item['uri'] != $item['thr-parent']) {
 949                         $data['inReplyTo'] = $item['thr-parent'];
 950                 } else {
 951                         $data['inReplyTo'] = null;
 952                 }
 953
 954                 $data['diaspora:guid'] = $item['guid'];
 955                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 956
 957                 if ($item['created'] != $item['edited']) {
 958                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 959                 }
 960
 961                 $data['url'] = $item['plink'];
 962                 $data['attributedTo'] = $item['author-link'];
 963                 $data['sensitive'] = self::isSensitive($item['id']);
 964                 $data['context'] = self::fetchContextURLForItem($item);
 965
 966                 if (!empty($item['title'])) {
 967                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 968                 }
 969
 970                 $body = $item['body'];
 971
 972                 if ($type == 'Note') {
 973                         $body = self::removePictures($body);
 974                 }
 975
 976                 if ($type == 'Event') {
 977                         $data = array_merge($data, self::createEvent($item));
 978                 } else {
 979                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
 980                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
 981
 982                         $data['content'] = BBCode::convert($body, false, 7);
 983                 }
 984
 985                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 986
 987                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 988                         $data['diaspora:comment'] = $item['signed_text'];
 989                 }
 990
 991                 $data['attachment'] = self::createAttachmentList($item, $type);
 992                 $data['tag'] = self::createTagList($item);
 993
 994                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 995                         $data['location'] = self::createLocation($item);
 996                 }
 997
 998                 if (!empty($item['app'])) {
 999                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1000                 }
1001
1002                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
1003
1004                 return $data;
1005         }
1006
1007         /**
1008          * Creates an announce object entry
1009          *
1010          * @param array $item
1011          *
1012          * @return string with announced object url
1013          */
1014         public static function createAnnounce($item)
1015         {
1016                 $announce = api_share_as_retweet($item);
1017                 if (empty($announce['plink'])) {
1018                         return self::createNote($item);
1019                 }
1020
1021                 return $announce['plink'];
1022         }
1023
1024         /**
1025          * Creates an activity id for a given contact id
1026          *
1027          * @param integer $cid Contact ID of target
1028          *
1029          * @return bool|string activity id
1030          */
1031         public static function activityIDFromContact($cid)
1032         {
1033                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1034                 if (!DBA::isResult($contact)) {
1035                         return false;
1036                 }
1037
1038                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1039                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1040                 return System::baseUrl() . '/activity/' . $uuid;
1041         }
1042
1043         /**
1044          * Transmits a contact suggestion to a given inbox
1045          *
1046          * @param integer $uid User ID
1047          * @param string $inbox Target inbox
1048          * @param integer $suggestion_id Suggestion ID
1049          *
1050          * @return boolean was the transmission successful?
1051          */
1052         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1053         {
1054                 $owner = User::getOwnerDataById($uid);
1055
1056                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1057
1058                 $data = ['@context' => ActivityPub::CONTEXT,
1059                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1060                         'type' => 'Announce',
1061                         'actor' => $owner['url'],
1062                         'object' => $suggestion['url'],
1063                         'content' => $suggestion['note'],
1064                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1065                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1066                         'cc' => []];
1067
1068                 $signed = LDSignature::sign($data, $owner);
1069
1070                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1071                 return HTTPSignature::transmit($signed, $inbox, $uid);
1072         }
1073
1074         /**
1075          * Transmits a profile relocation to a given inbox
1076          *
1077          * @param integer $uid User ID
1078          * @param string $inbox Target inbox
1079          *
1080          * @return boolean was the transmission successful?
1081          */
1082         public static function sendProfileRelocation($uid, $inbox)
1083         {
1084                 $owner = User::getOwnerDataById($uid);
1085
1086                 $data = ['@context' => ActivityPub::CONTEXT,
1087                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1088                         'type' => 'dfrn:relocate',
1089                         'actor' => $owner['url'],
1090                         'object' => $owner['url'],
1091                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1092                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1093                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1094                         'cc' => []];
1095
1096                 $signed = LDSignature::sign($data, $owner);
1097
1098                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1099                 return HTTPSignature::transmit($signed, $inbox, $uid);
1100         }
1101
1102         /**
1103          * Transmits a profile deletion to a given inbox
1104          *
1105          * @param integer $uid User ID
1106          * @param string $inbox Target inbox
1107          *
1108          * @return boolean was the transmission successful?
1109          */
1110         public static function sendProfileDeletion($uid, $inbox)
1111         {
1112                 $owner = User::getOwnerDataById($uid);
1113
1114                 $data = ['@context' => ActivityPub::CONTEXT,
1115                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1116                         'type' => 'Delete',
1117                         'actor' => $owner['url'],
1118                         'object' => $owner['url'],
1119                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1120                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1121                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1122                         'cc' => []];
1123
1124                 $signed = LDSignature::sign($data, $owner);
1125
1126                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1127                 return HTTPSignature::transmit($signed, $inbox, $uid);
1128         }
1129
1130         /**
1131          * Transmits a profile change to a given inbox
1132          *
1133          * @param integer $uid User ID
1134          * @param string $inbox Target inbox
1135          *
1136          * @return boolean was the transmission successful?
1137          */
1138         public static function sendProfileUpdate($uid, $inbox)
1139         {
1140                 $owner = User::getOwnerDataById($uid);
1141                 $profile = APContact::getByURL($owner['url']);
1142
1143                 $data = ['@context' => ActivityPub::CONTEXT,
1144                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1145                         'type' => 'Update',
1146                         'actor' => $owner['url'],
1147                         'object' => self::getProfile($uid),
1148                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1149                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1150                         'to' => [$profile['followers']],
1151                         'cc' => []];
1152
1153                 $signed = LDSignature::sign($data, $owner);
1154
1155                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1156                 return HTTPSignature::transmit($signed, $inbox, $uid);
1157         }
1158
1159         /**
1160          * Transmits a given activity to a target
1161          *
1162          * @param array $activity
1163          * @param string $target Target profile
1164          * @param integer $uid User ID
1165          * @param string $id activity id
1166          */
1167         public static function sendActivity($activity, $target, $uid, $id = '')
1168         {
1169                 $profile = APContact::getByURL($target);
1170
1171                 $owner = User::getOwnerDataById($uid);
1172
1173                 if (empty($id)) {
1174                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1175                 }
1176
1177                 $data = ['@context' => ActivityPub::CONTEXT,
1178                         'id' => $id,
1179                         'type' => $activity,
1180                         'actor' => $owner['url'],
1181                         'object' => $profile['url'],
1182                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1183                         'to' => [$profile['url']]];
1184
1185                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1186
1187                 $signed = LDSignature::sign($data, $owner);
1188                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1189         }
1190
1191         /**
1192          * Transmit a message that the contact request had been accepted
1193          *
1194          * @param string $target Target profile
1195          * @param $id
1196          * @param integer $uid User ID
1197          */
1198         public static function sendContactAccept($target, $id, $uid)
1199         {
1200                 $profile = APContact::getByURL($target);
1201
1202                 $owner = User::getOwnerDataById($uid);
1203                 $data = ['@context' => ActivityPub::CONTEXT,
1204                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1205                         'type' => 'Accept',
1206                         'actor' => $owner['url'],
1207                         'object' => ['id' => $id, 'type' => 'Follow',
1208                                 'actor' => $profile['url'],
1209                                 'object' => $owner['url']],
1210                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1211                         'to' => [$profile['url']]];
1212
1213                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1214
1215                 $signed = LDSignature::sign($data, $owner);
1216                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1217         }
1218
1219         /**
1220          * Reject a contact request or terminates the contact relation
1221          *
1222          * @param string $target Target profile
1223          * @param $id
1224          * @param integer $uid User ID
1225          */
1226         public static function sendContactReject($target, $id, $uid)
1227         {
1228                 $profile = APContact::getByURL($target);
1229
1230                 $owner = User::getOwnerDataById($uid);
1231                 $data = ['@context' => ActivityPub::CONTEXT,
1232                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1233                         'type' => 'Reject',
1234                         'actor' => $owner['url'],
1235                         'object' => ['id' => $id, 'type' => 'Follow',
1236                                 'actor' => $profile['url'],
1237                                 'object' => $owner['url']],
1238                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1239                         'to' => [$profile['url']]];
1240
1241                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1242
1243                 $signed = LDSignature::sign($data, $owner);
1244                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1245         }
1246
1247         /**
1248          * Transmits a message that we don't want to follow this contact anymore
1249          *
1250          * @param string $target Target profile
1251          * @param integer $cid Contact ID of target
1252          * @param integer $uid User ID
1253          */
1254         public static function sendContactUndo($target, $cid, $uid)
1255         {
1256                 $profile = APContact::getByURL($target);
1257
1258                 $object_id = self::activityIDFromContact($cid);
1259                 if (empty($object_id)) {
1260                         return;
1261                 }
1262
1263                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1264
1265                 $owner = User::getOwnerDataById($uid);
1266                 $data = ['@context' => ActivityPub::CONTEXT,
1267                         'id' => $id,
1268                         'type' => 'Undo',
1269                         'actor' => $owner['url'],
1270                         'object' => ['id' => $object_id, 'type' => 'Follow',
1271                                 'actor' => $owner['url'],
1272                                 'object' => $profile['url']],
1273                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1274                         'to' => [$profile['url']]];
1275
1276                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1277
1278                 $signed = LDSignature::sign($data, $owner);
1279                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1280         }
1281 }