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\Database\DBA;
   8 use Friendica\Core\System;
   9 use Friendica\Util\HTTPSignature;
  10 use Friendica\Core\Protocol;
  11 use Friendica\Model\Conversation;
  12 use Friendica\Model\Contact;
  13 use Friendica\Model\APContact;
  14 use Friendica\Model\Item;
  15 use Friendica\Model\Term;
  16 use Friendica\Model\User;
  17 use Friendica\Util\DateTimeFormat;
  18 use Friendica\Content\Text\BBCode;
  19 use Friendica\Util\JsonLD;
  20 use Friendica\Util\LDSignature;
  21 use Friendica\Model\Profile;
  22 use Friendica\Core\Config;
  23 use Friendica\Object\Image;
  24 use Friendica\Protocol\ActivityPub;
  25
  26 /**
  27  * @brief ActivityPub Transmitter Protocol class
  28  *
  29  * To-Do:
  30  * - Event
  31  *
  32  * Complicated:
  33  * - Announce
  34  * - Undo Announce
  35  *
  36  * General:
  37  * - Queueing unsucessful deliveries
  38  */
  39 class Transmitter
  40 {
  41         /**
  42          * @brief 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          * @brief 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          * @brief 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' => $owner['uid'], 'contact-id' => $owner['id'], 'author-id' => $public_contact,
 148                         'wall' => true, '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 $uid User ID
 187          * @return profile array
 188          */
 189         public static function getProfile($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'];
 206                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 207                 if (!DBA::isResult($contact)) {
 208                         return [];
 209                 }
 210
 211                 $data = ['@context' => ActivityPub::CONTEXT];
 212                 $data['id'] = $contact['url'];
 213                 $data['diaspora:guid'] = $user['guid'];
 214                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 215                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 216                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 217                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 218                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 219                 $data['preferredUsername'] = $user['nickname'];
 220                 $data['name'] = $contact['name'];
 221                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 222                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 223                 $data['summary'] = $contact['about'];
 224                 $data['url'] = $contact['url'];
 225                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 226                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 227                         'owner' => $contact['url'],
 228                         'publicKeyPem' => $user['pubkey']];
 229                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 230                 $data['icon'] = ['type' => 'Image',
 231                         'url' => $contact['avatar']];
 232
 233                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 234                 return $data;
 235         }
 236
 237         /**
 238          * @brief Returns an array with permissions of a given item array
 239          *
 240          * @param array $item
 241          *
 242          * @return array with permissions
 243          */
 244         private static function fetchPermissionBlockFromConversation($item)
 245         {
 246                 if (empty($item['thr-parent'])) {
 247                         return [];
 248                 }
 249
 250                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 251                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 252                 if (!DBA::isResult($conversation)) {
 253                         return [];
 254                 }
 255
 256                 $activity = json_decode($conversation['source'], true);
 257
 258                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 259                 $profile = APContact::getByURL($actor);
 260
 261                 $item_profile = APContact::getByURL($item['author-link']);
 262                 $exclude[] = $item['author-link'];
 263
 264                 if ($item['gravity'] == GRAVITY_PARENT) {
 265                         $exclude[] = $item['owner-link'];
 266                 }
 267
 268                 $permissions['to'][] = $actor;
 269
 270                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 271                         if (empty($activity[$element])) {
 272                                 continue;
 273                         }
 274                         if (is_string($activity[$element])) {
 275                                 $activity[$element] = [$activity[$element]];
 276                         }
 277
 278                         foreach ($activity[$element] as $receiver) {
 279                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 280                                         $receiver = $item_profile['followers'];
 281                                 }
 282                                 if (!in_array($receiver, $exclude)) {
 283                                         $permissions[$element][] = $receiver;
 284                                 }
 285                         }
 286                 }
 287                 return $permissions;
 288         }
 289
 290         /**
 291          * @brief Creates an array of permissions from an item thread
 292          *
 293          * @param array $item
 294          *
 295          * @return permission array
 296          */
 297         private static function createPermissionBlockForItem($item)
 298         {
 299                 $data = ['to' => [], 'cc' => []];
 300
 301                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 302
 303                 $actor_profile = APContact::getByURL($item['author-link']);
 304
 305                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 306
 307                 $contacts[$item['author-link']] = $item['author-link'];
 308
 309                 if (!$item['private']) {
 310                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 311                         if (!empty($actor_profile['followers'])) {
 312                                 $data['cc'][] = $actor_profile['followers'];
 313                         }
 314
 315                         foreach ($terms as $term) {
 316                                 $profile = APContact::getByURL($term['url'], false);
 317                                 if (!empty($profile) && empty($contacts[$profile['url']])) {
 318                                         $data['cc'][] = $profile['url'];
 319                                         $contacts[$profile['url']] = $profile['url'];
 320                                 }
 321                         }
 322                 } else {
 323                         $receiver_list = Item::enumeratePermissions($item);
 324
 325                         $mentioned = [];
 326
 327                         foreach ($terms as $term) {
 328                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 329                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 330                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
 331                                         $data['to'][] = $contact['url'];
 332                                         $contacts[$contact['url']] = $contact['url'];
 333                                 }
 334                         }
 335
 336                         foreach ($receiver_list as $receiver) {
 337                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
 338                                 if (empty($contacts[$contact['url']])) {
 339                                         $data['cc'][] = $contact['url'];
 340                                         $contacts[$contact['url']] = $contact['url'];
 341                                 }
 342                         }
 343                 }
 344
 345                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
 346                 while ($parent = Item::fetch($parents)) {
 347                         // Don't include data from future posts
 348                         if ($parent['id'] >= $item['id']) {
 349                                 continue;
 350                         }
 351
 352                         $profile = APContact::getByURL($parent['author-link'], false);
 353                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 354                                 $data['cc'][] = $profile['url'];
 355                                 $contacts[$profile['url']] = $profile['url'];
 356                         }
 357
 358                         if ($item['gravity'] != GRAVITY_PARENT) {
 359                                 continue;
 360                         }
 361
 362                         $profile = APContact::getByURL($parent['owner-link'], false);
 363                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 364                                 $data['cc'][] = $profile['url'];
 365                                 $contacts[$profile['url']] = $profile['url'];
 366                         }
 367                 }
 368                 DBA::close($parents);
 369
 370                 if (empty($data['to'])) {
 371                         $data['to'] = $data['cc'];
 372                         $data['cc'] = [];
 373                 }
 374
 375                 return $data;
 376         }
 377
 378         /**
 379          * @brief Fetches a list of inboxes of followers of a given user
 380          *
 381          * @param integer $uid User ID
 382          *
 383          * @return array of follower inboxes
 384          */
 385         public static function fetchTargetInboxesforUser($uid)
 386         {
 387                 $inboxes = [];
 388
 389                 $condition = ['uid' => $uid, 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
 390
 391                 if (!empty($uid)) {
 392                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 393                 }
 394
 395                 $contacts = DBA::select('contact', ['notify', 'batch'], $condition);
 396                 while ($contact = DBA::fetch($contacts)) {
 397                         $contact = defaults($contact, 'batch', $contact['notify']);
 398                         $inboxes[$contact] = $contact;
 399                 }
 400                 DBA::close($contacts);
 401
 402                 return $inboxes;
 403         }
 404
 405         /**
 406          * @brief Fetches an array of inboxes for the given item and user
 407          *
 408          * @param array $item
 409          * @param integer $uid User ID
 410          *
 411          * @return array with inboxes
 412          */
 413         public static function fetchTargetInboxes($item, $uid)
 414         {
 415                 $permissions = self::createPermissionBlockForItem($item);
 416                 if (empty($permissions)) {
 417                         return [];
 418                 }
 419
 420                 $inboxes = [];
 421
 422                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 423                         $item_profile = APContact::getByURL($item['author-link']);
 424                 } else {
 425                         $item_profile = APContact::getByURL($item['owner-link']);
 426                 }
 427
 428                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 429                         if (empty($permissions[$element])) {
 430                                 continue;
 431                         }
 432
 433                         foreach ($permissions[$element] as $receiver) {
 434                                 if ($receiver == $item_profile['followers']) {
 435                                         $inboxes = self::fetchTargetInboxesforUser($uid);
 436                                 } else {
 437                                         $profile = APContact::getByURL($receiver);
 438                                         if (!empty($profile)) {
 439                                                 $target = defaults($profile, 'sharedinbox', $profile['inbox']);
 440                                                 $inboxes[$target] = $target;
 441                                         }
 442                                 }
 443                         }
 444                 }
 445
 446                 return $inboxes;
 447         }
 448
 449         /**
 450          * @brief Returns the activity type of a given item
 451          *
 452          * @param array $item
 453          *
 454          * @return activity type
 455          */
 456         private static function getTypeOfItem($item)
 457         {
 458                 if ($item['verb'] == ACTIVITY_POST) {
 459                         if ($item['created'] == $item['edited']) {
 460                                 $type = 'Create';
 461                         } else {
 462                                 $type = 'Update';
 463                         }
 464                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 465                         $type = 'Like';
 466                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 467                         $type = 'Dislike';
 468                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 469                         $type = 'Accept';
 470                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 471                         $type = 'Reject';
 472                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 473                         $type = 'TentativeAccept';
 474                 } else {
 475                         $type = '';
 476                 }
 477
 478                 return $type;
 479         }
 480
 481         /**
 482          * @brief Creates an activity array for a given item id
 483          *
 484          * @param integer $item_id
 485          * @param boolean $object_mode Is the activity item is used inside another object?
 486          *
 487          * @return array of activity
 488          */
 489         public static function createActivityFromItem($item_id, $object_mode = false)
 490         {
 491                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 492
 493                 if (!DBA::isResult($item)) {
 494                         return false;
 495                 }
 496
 497                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 498                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 499                 if (DBA::isResult($conversation)) {
 500                         $data = json_decode($conversation['source']);
 501                         if (!empty($data)) {
 502                                 return $data;
 503                         }
 504                 }
 505
 506                 $type = self::getTypeOfItem($item);
 507
 508                 if (!$object_mode) {
 509                         $data = ['@context' => ActivityPub::CONTEXT];
 510
 511                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 512                                 $type = 'Undo';
 513                         } elseif ($item['deleted']) {
 514                                 $type = 'Delete';
 515                         }
 516                 } else {
 517                         $data = [];
 518                 }
 519
 520                 $data['id'] = $item['uri'] . '#' . $type;
 521                 $data['type'] = $type;
 522                 $data['actor'] = $item['author-link'];
 523
 524                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 525
 526                 if ($item["created"] != $item["edited"]) {
 527                         $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 528                 }
 529
 530                 $data['context'] = self::fetchContextURLForItem($item);
 531
 532                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 533
 534                 if (in_array($data['type'], ['Create', 'Update', 'Announce', 'Delete'])) {
 535                         $data['object'] = self::createNote($item);
 536                 } elseif ($data['type'] == 'Undo') {
 537                         $data['object'] = self::createActivityFromItem($item_id, true);
 538                 } else {
 539                         $data['object'] = $item['thr-parent'];
 540                 }
 541
 542                 $owner = User::getOwnerDataById($item['uid']);
 543
 544                 if (!$object_mode) {
 545                         return LDSignature::sign($data, $owner);
 546                 } else {
 547                         return $data;
 548                 }
 549         }
 550
 551         /**
 552          * @brief Creates an object array for a given item id
 553          *
 554          * @param integer $item_id
 555          *
 556          * @return object array
 557          */
 558         public static function createObjectFromItemID($item_id)
 559         {
 560                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 561
 562                 if (!DBA::isResult($item)) {
 563                         return false;
 564                 }
 565
 566                 $data = ['@context' => ActivityPub::CONTEXT];
 567                 $data = array_merge($data, self::createNote($item));
 568
 569                 return $data;
 570         }
 571
 572         /**
 573          * @brief Returns a tag array for a given item array
 574          *
 575          * @param array $item
 576          *
 577          * @return array of tags
 578          */
 579         private static function createTagList($item)
 580         {
 581                 $tags = [];
 582
 583                 $terms = Term::tagArrayFromItemId($item['id']);
 584                 foreach ($terms as $term) {
 585                         if ($term['type'] == TERM_HASHTAG) {
 586                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 587                         } elseif ($term['type'] == TERM_MENTION) {
 588                                 $contact = Contact::getDetailsByURL($term['url']);
 589                                 if (!empty($contact['addr'])) {
 590                                         $mention = '@' . $contact['addr'];
 591                                 } else {
 592                                         $mention = '@' . $term['url'];
 593                                 }
 594
 595                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 596                         }
 597                 }
 598                 return $tags;
 599         }
 600
 601         /**
 602          * @brief Adds attachment data to the JSON document
 603          *
 604          * @param array $item Data of the item that is to be posted
 605          * @return attachment array
 606          */
 607
 608         private static function createAttachmentList($item)
 609         {
 610                 $attachments = [];
 611
 612                 $siteinfo = BBCode::getAttachedData($item['body']);
 613
 614                 switch ($siteinfo['type']) {
 615                         case 'photo':
 616                                 if (!empty($siteinfo['image'])) {
 617                                         $imgdata = Image::getInfoFromURL($siteinfo['image']);
 618                                         if ($imgdata) {
 619                                                 $attachments[] = ['type' => 'Document',
 620                                                                 'mediaType' => $imgdata['mime'],
 621                                                                 'url' => $siteinfo['image'],
 622                                                                 'name' => null];
 623                                         }
 624                                 }
 625                                 break;
 626                         case 'video':
 627                                 $attachments[] = ['type' => 'Document',
 628                                                 'mediaType' => 'text/html; charset=UTF-8',
 629                                                 'url' => $siteinfo['url'],
 630                                                 'name' => defaults($siteinfo, 'title', $siteinfo['url'])];
 631                                 break;
 632                         default:
 633                                 break;
 634                 }
 635
 636                 if (!Config::get('system', 'ostatus_not_attach_preview') && ($siteinfo['type'] != 'photo') && isset($siteinfo['image'])) {
 637                         $imgdata = Image::getInfoFromURL($siteinfo['image']);
 638                         if ($imgdata) {
 639                                 $attachments[] = ['type' => 'Document',
 640                                                 'mediaType' => $imgdata['mime'],
 641                                                 'url' => $siteinfo['image'],
 642                                                 'name' => null];
 643                         }
 644                 }
 645
 646                 $arr = explode('[/attach],', $item['attach']);
 647                 if (count($arr)) {
 648                         foreach ($arr as $r) {
 649                                 $matches = false;
 650                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 651                                 if ($cnt) {
 652                                         $attributes = ['type' => 'Document',
 653                                                         'mediaType' => $matches[3],
 654                                                         'url' => $matches[1],
 655                                                         'name' => null];
 656
 657                                         if (trim($matches[4]) != '') {
 658                                                 $attributes['name'] = trim($matches[4]);
 659                                         }
 660
 661                                         $attachments[] = $attributes;
 662                                 }
 663                         }
 664                 }
 665
 666                 return $attachments;
 667         }
 668
 669         /**
 670          * @brief Fetches the "context" value for a givem item array from the "conversation" table
 671          *
 672          * @param array $item
 673          *
 674          * @return string with context url
 675          */
 676         private static function fetchContextURLForItem($item)
 677         {
 678                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 679                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 680                         $context_uri = $conversation['conversation-href'];
 681                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 682                         $context_uri = $conversation['conversation-uri'];
 683                 } else {
 684                         $context_uri = str_replace('/objects/', '/context/', $item['parent-uri']);
 685                 }
 686                 return $context_uri;
 687         }
 688
 689         private static function fetchSensitive($item_id)
 690         {
 691                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 692                 return DBA::exists('term', $condition);
 693         }
 694
 695         /**
 696          * @brief Creates a note/article object array
 697          *
 698          * @param array $item
 699          *
 700          * @return object array
 701          */
 702         public static function createNote($item)
 703         {
 704                 if (!empty($item['title'])) {
 705                         $type = 'Article';
 706                 } else {
 707                         $type = 'Note';
 708                 }
 709
 710                 if ($item['deleted']) {
 711                         $type = 'Tombstone';
 712                 }
 713
 714                 $data = [];
 715                 $data['id'] = $item['uri'];
 716                 $data['type'] = $type;
 717
 718                 if ($item['deleted']) {
 719                         return $data;
 720                 }
 721
 722                 $data['summary'] = null; // Ignore by now
 723
 724                 if ($item['uri'] != $item['thr-parent']) {
 725                         $data['inReplyTo'] = $item['thr-parent'];
 726                 } else {
 727                         $data['inReplyTo'] = null;
 728                 }
 729
 730                 $data['diaspora:guid'] = $item['guid'];
 731                 $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 732
 733                 if ($item["created"] != $item["edited"]) {
 734                         $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
 735                 }
 736
 737                 $data['url'] = $item['plink'];
 738                 $data['attributedTo'] = $item['author-link'];
 739                 $data['actor'] = $item['author-link'];
 740                 $data['sensitive'] = self::fetchSensitive($item['id']);
 741                 $data['context'] = self::fetchContextURLForItem($item);
 742
 743                 if (!empty($item['title'])) {
 744                         $data['name'] = BBCode::convert($item['title'], false, 7);
 745                 }
 746
 747                 $data['content'] = BBCode::convert($item['body'], false, 7);
 748                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 749
 750                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 751                         $data['diaspora:comment'] = $item['signed_text'];
 752                 }
 753
 754                 $data['attachment'] = self::createAttachmentList($item);
 755                 $data['tag'] = self::createTagList($item);
 756                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 757
 758                 return $data;
 759         }
 760
 761         /**
 762          * @brief Transmits a profile deletion to a given inbox
 763          *
 764          * @param integer $uid User ID
 765          * @param string $inbox Target inbox
 766          */
 767         public static function sendProfileDeletion($uid, $inbox)
 768         {
 769                 $owner = User::getOwnerDataById($uid);
 770                 $profile = APContact::getByURL($owner['url']);
 771
 772                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 773                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 774                         'type' => 'Delete',
 775                         'actor' => $owner['url'],
 776                         'object' => $owner['url'],
 777                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 778                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 779                         'cc' => []];
 780
 781                 $signed = LDSignature::sign($data, $owner);
 782
 783                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox .' via ActivityPub', LOGGER_DEBUG);
 784                 HTTPSignature::transmit($signed, $inbox, $uid);
 785         }
 786
 787         /**
 788          * @brief Transmits a profile change to a given inbox
 789          *
 790          * @param integer $uid User ID
 791          * @param string $inbox Target inbox
 792          */
 793         public static function sendProfileUpdate($uid, $inbox)
 794         {
 795                 $owner = User::getOwnerDataById($uid);
 796                 $profile = APContact::getByURL($owner['url']);
 797
 798                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 799                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 800                         'type' => 'Update',
 801                         'actor' => $owner['url'],
 802                         'object' => self::getProfile($uid),
 803                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 804                         'to' => [$profile['followers']],
 805                         'cc' => []];
 806
 807                 $signed = LDSignature::sign($data, $owner);
 808
 809                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox .' via ActivityPub', LOGGER_DEBUG);
 810                 HTTPSignature::transmit($signed, $inbox, $uid);
 811         }
 812
 813         /**
 814          * @brief Transmits a given activity to a target
 815          *
 816          * @param array $activity
 817          * @param string $target Target profile
 818          * @param integer $uid User ID
 819          */
 820         public static function sendActivity($activity, $target, $uid)
 821         {
 822                 $profile = APContact::getByURL($target);
 823
 824                 $owner = User::getOwnerDataById($uid);
 825
 826                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 827                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 828                         'type' => $activity,
 829                         'actor' => $owner['url'],
 830                         'object' => $profile['url'],
 831                         'to' => $profile['url']];
 832
 833                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 834
 835                 $signed = LDSignature::sign($data, $owner);
 836                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 837         }
 838
 839         /**
 840          * @brief Transmit a message that the contact request had been accepted
 841          *
 842          * @param string $target Target profile
 843          * @param $id
 844          * @param integer $uid User ID
 845          */
 846         public static function sendContactAccept($target, $id, $uid)
 847         {
 848                 $profile = APContact::getByURL($target);
 849
 850                 $owner = User::getOwnerDataById($uid);
 851                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 852                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 853                         'type' => 'Accept',
 854                         'actor' => $owner['url'],
 855                         'object' => ['id' => $id, 'type' => 'Follow',
 856                                 'actor' => $profile['url'],
 857                                 'object' => $owner['url']],
 858                         'to' => $profile['url']];
 859
 860                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 861
 862                 $signed = LDSignature::sign($data, $owner);
 863                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 864         }
 865
 866         /**
 867          * @brief
 868          *
 869          * @param string $target Target profile
 870          * @param $id
 871          * @param integer $uid User ID
 872          */
 873         public static function sendContactReject($target, $id, $uid)
 874         {
 875                 $profile = APContact::getByURL($target);
 876
 877                 $owner = User::getOwnerDataById($uid);
 878                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 879                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 880                         'type' => 'Reject',
 881                         'actor' => $owner['url'],
 882                         'object' => ['id' => $id, 'type' => 'Follow',
 883                                 'actor' => $profile['url'],
 884                                 'object' => $owner['url']],
 885                         'to' => $profile['url']];
 886
 887                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 888
 889                 $signed = LDSignature::sign($data, $owner);
 890                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 891         }
 892
 893         /**
 894          * @brief
 895          *
 896          * @param string $target Target profile
 897          * @param integer $uid User ID
 898          */
 899         public static function sendContactUndo($target, $uid)
 900         {
 901                 $profile = APContact::getByURL($target);
 902
 903                 $id = System::baseUrl() . '/activity/' . System::createGUID();
 904
 905                 $owner = User::getOwnerDataById($uid);
 906                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 907                         'id' => $id,
 908                         'type' => 'Undo',
 909                         'actor' => $owner['url'],
 910                         'object' => ['id' => $id, 'type' => 'Follow',
 911                                 'actor' => $owner['url'],
 912                                 'object' => $profile['url']],
 913                         'to' => $profile['url']];
 914
 915                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 916
 917                 $signed = LDSignature::sign($data, $owner);
 918                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 919         }
 920 }