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 use Friendica\Core\Cache;
  26
  27 /**
  28  * @brief ActivityPub Transmitter Protocol class
  29  *
  30  * To-Do:
  31  *
  32  * Missing object fields:
  33  * - service (App)
  34  * - location
  35  *
  36  * Missing object types:
  37  * - Event
  38  *
  39  * Complicated object types:
  40  * - Announce
  41  * - Undo Announce
  42  *
  43  * General:
  44  * - Queueing unsucessful deliveries
  45  */
  46 class Transmitter
  47 {
  48         /**
  49          * collects the lost of followers of the given owner
  50          *
  51          * @param array $owner Owner array
  52          * @param integer $page Page number
  53          *
  54          * @return array of owners
  55          */
  56         public static function getFollowers($owner, $page = null)
  57         {
  58                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  59                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  60                 $count = DBA::count('contact', $condition);
  61
  62                 $data = ['@context' => ActivityPub::CONTEXT];
  63                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  64                 $data['type'] = 'OrderedCollection';
  65                 $data['totalItems'] = $count;
  66
  67                 // When we hide our friends we will only show the pure number but don't allow more.
  68                 $profile = Profile::getByUID($owner['uid']);
  69                 if (!empty($profile['hide-friends'])) {
  70                         return $data;
  71                 }
  72
  73                 if (empty($page)) {
  74                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  75                 } else {
  76                         $list = [];
  77
  78                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  79                         while ($contact = DBA::fetch($contacts)) {
  80                                 $list[] = $contact['url'];
  81                         }
  82
  83                         if (!empty($list)) {
  84                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  85                         }
  86
  87                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  88
  89                         $data['orderedItems'] = $list;
  90                 }
  91
  92                 return $data;
  93         }
  94
  95         /**
  96          * Create list of following contacts
  97          *
  98          * @param array $owner Owner array
  99          * @param integer $page Page numbe
 100          *
 101          * @return array of following contacts
 102          */
 103         public static function getFollowing($owner, $page = null)
 104         {
 105                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 106                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 107                 $count = DBA::count('contact', $condition);
 108
 109                 $data = ['@context' => ActivityPub::CONTEXT];
 110                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 111                 $data['type'] = 'OrderedCollection';
 112                 $data['totalItems'] = $count;
 113
 114                 // When we hide our friends we will only show the pure number but don't allow more.
 115                 $profile = Profile::getByUID($owner['uid']);
 116                 if (!empty($profile['hide-friends'])) {
 117                         return $data;
 118                 }
 119
 120                 if (empty($page)) {
 121                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 122                 } else {
 123                         $list = [];
 124
 125                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 126                         while ($contact = DBA::fetch($contacts)) {
 127                                 $list[] = $contact['url'];
 128                         }
 129
 130                         if (!empty($list)) {
 131                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 132                         }
 133
 134                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 135
 136                         $data['orderedItems'] = $list;
 137                 }
 138
 139                 return $data;
 140         }
 141
 142         /**
 143          * Public posts for the given owner
 144          *
 145          * @param array $owner Owner array
 146          * @param integer $page Page numbe
 147          *
 148          * @return array of posts
 149          */
 150         public static function getOutbox($owner, $page = null)
 151         {
 152                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 153
 154                 $condition = ['uid' => $owner['uid'], 'contact-id' => $owner['id'], 'author-id' => $public_contact,
 155                         'wall' => true, 'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 156                         'deleted' => false, 'visible' => true];
 157                 $count = DBA::count('item', $condition);
 158
 159                 $data = ['@context' => ActivityPub::CONTEXT];
 160                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 161                 $data['type'] = 'OrderedCollection';
 162                 $data['totalItems'] = $count;
 163
 164                 if (empty($page)) {
 165                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 166                 } else {
 167                         $list = [];
 168
 169                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 170
 171                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 172                         while ($item = Item::fetch($items)) {
 173                                 $object = self::createObjectFromItemID($item['id']);
 174                                 unset($object['@context']);
 175                                 $list[] = $object;
 176                         }
 177
 178                         if (!empty($list)) {
 179                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 180                         }
 181
 182                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 183
 184                         $data['orderedItems'] = $list;
 185                 }
 186
 187                 return $data;
 188         }
 189
 190         /**
 191          * Return the ActivityPub profile of the given user
 192          *
 193          * @param integer $uid User ID
 194          * @return array with profile data
 195          */
 196         public static function getProfile($uid)
 197         {
 198                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 199                         'account_removed' => false, 'verified' => true];
 200                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 201                 $user = DBA::selectFirst('user', $fields, $condition);
 202                 if (!DBA::isResult($user)) {
 203                         return [];
 204                 }
 205
 206                 $fields = ['locality', 'region', 'country-name'];
 207                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 208                 if (!DBA::isResult($profile)) {
 209                         return [];
 210                 }
 211
 212                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 213                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 214                 if (!DBA::isResult($contact)) {
 215                         return [];
 216                 }
 217
 218                 // On old installations and never changed contacts this might not be filled
 219                 if (empty($contact['avatar'])) {
 220                         $contact['avatar'] = $contact['photo'];
 221                 }
 222
 223                 $data = ['@context' => ActivityPub::CONTEXT];
 224                 $data['id'] = $contact['url'];
 225                 $data['diaspora:guid'] = $user['guid'];
 226                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 227                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 228                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 229                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 230                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 231                 $data['preferredUsername'] = $user['nickname'];
 232                 $data['name'] = $contact['name'];
 233                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 234                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 235                 $data['summary'] = $contact['about'];
 236                 $data['url'] = $contact['url'];
 237                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 238                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 239                         'owner' => $contact['url'],
 240                         'publicKeyPem' => $user['pubkey']];
 241                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 242                 $data['icon'] = ['type' => 'Image',
 243                         'url' => $contact['avatar']];
 244
 245                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 246                 return $data;
 247         }
 248
 249         /**
 250          * Returns an array with permissions of a given item array
 251          *
 252          * @param array $item
 253          *
 254          * @return array with permissions
 255          */
 256         private static function fetchPermissionBlockFromConversation($item)
 257         {
 258                 if (empty($item['thr-parent'])) {
 259                         return [];
 260                 }
 261
 262                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 263                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 264                 if (!DBA::isResult($conversation)) {
 265                         return [];
 266                 }
 267
 268                 $activity = json_decode($conversation['source'], true);
 269
 270                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 271                 $profile = APContact::getByURL($actor);
 272
 273                 $item_profile = APContact::getByURL($item['author-link']);
 274                 $exclude[] = $item['author-link'];
 275
 276                 if ($item['gravity'] == GRAVITY_PARENT) {
 277                         $exclude[] = $item['owner-link'];
 278                 }
 279
 280                 $permissions['to'][] = $actor;
 281
 282                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 283                         if (empty($activity[$element])) {
 284                                 continue;
 285                         }
 286                         if (is_string($activity[$element])) {
 287                                 $activity[$element] = [$activity[$element]];
 288                         }
 289
 290                         foreach ($activity[$element] as $receiver) {
 291                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 292                                         $receiver = $item_profile['followers'];
 293                                 }
 294                                 if (!in_array($receiver, $exclude)) {
 295                                         $permissions[$element][] = $receiver;
 296                                 }
 297                         }
 298                 }
 299                 return $permissions;
 300         }
 301
 302         /**
 303          * Creates an array of permissions from an item thread
 304          *
 305          * @param array $item
 306          *
 307          * @return array with permission data
 308          */
 309         private static function createPermissionBlockForItem($item)
 310         {
 311                 $data = ['to' => [], 'cc' => []];
 312
 313                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 314
 315                 $actor_profile = APContact::getByURL($item['author-link']);
 316
 317                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 318
 319                 $contacts[$item['author-link']] = $item['author-link'];
 320
 321                 if (!$item['private']) {
 322                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 323                         if (!empty($actor_profile['followers'])) {
 324                                 $data['cc'][] = $actor_profile['followers'];
 325                         }
 326
 327                         foreach ($terms as $term) {
 328                                 $profile = APContact::getByURL($term['url'], false);
 329                                 if (!empty($profile) && empty($contacts[$profile['url']])) {
 330                                         $data['cc'][] = $profile['url'];
 331                                         $contacts[$profile['url']] = $profile['url'];
 332                                 }
 333                         }
 334                 } else {
 335                         $receiver_list = Item::enumeratePermissions($item);
 336
 337                         $mentioned = [];
 338
 339                         foreach ($terms as $term) {
 340                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 341                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 342                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
 343                                         $data['to'][] = $contact['url'];
 344                                         $contacts[$contact['url']] = $contact['url'];
 345                                 }
 346                         }
 347
 348                         foreach ($receiver_list as $receiver) {
 349                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
 350                                 if (empty($contacts[$contact['url']])) {
 351                                         $data['cc'][] = $contact['url'];
 352                                         $contacts[$contact['url']] = $contact['url'];
 353                                 }
 354                         }
 355                 }
 356
 357                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
 358                 while ($parent = Item::fetch($parents)) {
 359                         // Don't include data from future posts
 360                         if ($parent['id'] >= $item['id']) {
 361                                 continue;
 362                         }
 363
 364                         $profile = APContact::getByURL($parent['author-link'], false);
 365                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 366                                 $data['cc'][] = $profile['url'];
 367                                 $contacts[$profile['url']] = $profile['url'];
 368                         }
 369
 370                         if ($item['gravity'] != GRAVITY_PARENT) {
 371                                 continue;
 372                         }
 373
 374                         $profile = APContact::getByURL($parent['owner-link'], false);
 375                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 376                                 $data['cc'][] = $profile['url'];
 377                                 $contacts[$profile['url']] = $profile['url'];
 378                         }
 379                 }
 380                 DBA::close($parents);
 381
 382                 if (empty($data['to'])) {
 383                         $data['to'] = $data['cc'];
 384                         $data['cc'] = [];
 385                 }
 386
 387                 return $data;
 388         }
 389
 390         /**
 391          * Fetches a list of inboxes of followers of a given user
 392          *
 393          * @param integer $uid User ID
 394          *
 395          * @return array of follower inboxes
 396          */
 397         public static function fetchTargetInboxesforUser($uid)
 398         {
 399                 $inboxes = [];
 400
 401                 $condition = ['uid' => $uid, 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
 402
 403                 if (!empty($uid)) {
 404                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 405                 }
 406
 407                 $contacts = DBA::select('contact', ['notify', 'batch'], $condition);
 408                 while ($contact = DBA::fetch($contacts)) {
 409                         $contact = defaults($contact, 'batch', $contact['notify']);
 410                         $inboxes[$contact] = $contact;
 411                 }
 412                 DBA::close($contacts);
 413
 414                 return $inboxes;
 415         }
 416
 417         /**
 418          * Fetches an array of inboxes for the given item and user
 419          *
 420          * @param array $item
 421          * @param integer $uid User ID
 422          *
 423          * @return array with inboxes
 424          */
 425         public static function fetchTargetInboxes($item, $uid)
 426         {
 427                 $permissions = self::createPermissionBlockForItem($item);
 428                 if (empty($permissions)) {
 429                         return [];
 430                 }
 431
 432                 $inboxes = [];
 433
 434                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 435                         $item_profile = APContact::getByURL($item['author-link']);
 436                 } else {
 437                         $item_profile = APContact::getByURL($item['owner-link']);
 438                 }
 439
 440                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 441                         if (empty($permissions[$element])) {
 442                                 continue;
 443                         }
 444
 445                         foreach ($permissions[$element] as $receiver) {
 446                                 if ($receiver == $item_profile['followers']) {
 447                                         $inboxes = self::fetchTargetInboxesforUser($uid);
 448                                 } else {
 449                                         $profile = APContact::getByURL($receiver);
 450                                         if (!empty($profile)) {
 451                                                 $target = defaults($profile, 'sharedinbox', $profile['inbox']);
 452                                                 $inboxes[$target] = $target;
 453                                         }
 454                                 }
 455                         }
 456                 }
 457
 458                 return $inboxes;
 459         }
 460
 461         /**
 462          * Returns the activity type of a given item
 463          *
 464          * @param array $item
 465          *
 466          * @return string with activity type
 467          */
 468         private static function getTypeOfItem($item)
 469         {
 470                 if ($item['verb'] == ACTIVITY_POST) {
 471                         if ($item['created'] == $item['edited']) {
 472                                 $type = 'Create';
 473                         } else {
 474                                 $type = 'Update';
 475                         }
 476                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 477                         $type = 'Like';
 478                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 479                         $type = 'Dislike';
 480                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 481                         $type = 'Accept';
 482                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 483                         $type = 'Reject';
 484                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 485                         $type = 'TentativeAccept';
 486                 } else {
 487                         $type = '';
 488                 }
 489
 490                 return $type;
 491         }
 492
 493         /**
 494          * Creates the activity or fetches it from the cache
 495          *
 496          * @param integer $item_id
 497          *
 498          * @return array with the activity
 499          */
 500         public static function createCachedActivityFromItem($item_id)
 501         {
 502                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 503                 $data = Cache::get($cachekey);
 504                 if (!is_null($data)) {
 505                         return $data;
 506                 }
 507
 508                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 509
 510                 Cache::set($cachekey, $data, CACHE_QUARTER_HOUR);
 511                 return $data;
 512         }
 513
 514         /**
 515          * Creates an activity array for a given item id
 516          *
 517          * @param integer $item_id
 518          * @param boolean $object_mode Is the activity item is used inside another object?
 519          *
 520          * @return array of activity
 521          */
 522         public static function createActivityFromItem($item_id, $object_mode = false)
 523         {
 524                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 525
 526                 if (!DBA::isResult($item)) {
 527                         return false;
 528                 }
 529
 530                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 531                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 532                 if (DBA::isResult($conversation)) {
 533                         $data = json_decode($conversation['source']);
 534                         if (!empty($data)) {
 535                                 return $data;
 536                         }
 537                 }
 538
 539                 $type = self::getTypeOfItem($item);
 540
 541                 if (!$object_mode) {
 542                         $data = ['@context' => ActivityPub::CONTEXT];
 543
 544                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 545                                 $type = 'Undo';
 546                         } elseif ($item['deleted']) {
 547                                 $type = 'Delete';
 548                         }
 549                 } else {
 550                         $data = [];
 551                 }
 552
 553                 $data['id'] = $item['uri'] . '#' . $type;
 554                 $data['type'] = $type;
 555                 $data['actor'] = $item['owner-link'];
 556
 557                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 558
 559                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 560
 561                 if (in_array($data['type'], ['Create', 'Update', 'Announce', 'Delete'])) {
 562                         $data['object'] = self::createNote($item);
 563                 } elseif ($data['type'] == 'Undo') {
 564                         $data['object'] = self::createActivityFromItem($item_id, true);
 565                 } else {
 566                         $data['diaspora:guid'] = $item['guid'];
 567                         $data['object'] = $item['thr-parent'];
 568                 }
 569
 570                 $owner = User::getOwnerDataById($item['uid']);
 571
 572                 if (!$object_mode) {
 573                         return LDSignature::sign($data, $owner);
 574                 } else {
 575                         return $data;
 576                 }
 577
 578                 /// @todo Create "conversation" entry
 579         }
 580
 581         /**
 582          * Creates an object array for a given item id
 583          *
 584          * @param integer $item_id
 585          *
 586          * @return array with the object data
 587          */
 588         public static function createObjectFromItemID($item_id)
 589         {
 590                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 591
 592                 if (!DBA::isResult($item)) {
 593                         return false;
 594                 }
 595
 596                 $data = ['@context' => ActivityPub::CONTEXT];
 597                 $data = array_merge($data, self::createNote($item));
 598
 599                 return $data;
 600         }
 601
 602         /**
 603          * Returns a tag array for a given item array
 604          *
 605          * @param array $item
 606          *
 607          * @return array of tags
 608          */
 609         private static function createTagList($item)
 610         {
 611                 $tags = [];
 612
 613                 $terms = Term::tagArrayFromItemId($item['id']);
 614                 foreach ($terms as $term) {
 615                         if ($term['type'] == TERM_HASHTAG) {
 616                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 617                         } elseif ($term['type'] == TERM_MENTION) {
 618                                 $contact = Contact::getDetailsByURL($term['url']);
 619                                 if (!empty($contact['addr'])) {
 620                                         $mention = '@' . $contact['addr'];
 621                                 } else {
 622                                         $mention = '@' . $term['url'];
 623                                 }
 624
 625                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 626                         }
 627                 }
 628                 return $tags;
 629         }
 630
 631         /**
 632          * Adds attachment data to the JSON document
 633          *
 634          * @param array $item Data of the item that is to be posted
 635          * @param text $type Object type
 636          *
 637          * @return array with attachment data
 638          */
 639         private static function createAttachmentList($item, $type)
 640         {
 641                 $attachments = [];
 642
 643                 $arr = explode('[/attach],', $item['attach']);
 644                 if (count($arr)) {
 645                         foreach ($arr as $r) {
 646                                 $matches = false;
 647                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 648                                 if ($cnt) {
 649                                         $attributes = ['type' => 'Document',
 650                                                         'mediaType' => $matches[3],
 651                                                         'url' => $matches[1],
 652                                                         'name' => null];
 653
 654                                         if (trim($matches[4]) != '') {
 655                                                 $attributes['name'] = trim($matches[4]);
 656                                         }
 657
 658                                         $attachments[] = $attributes;
 659                                 }
 660                         }
 661                 }
 662
 663                 if ($type != 'Note') {
 664                         return $attachments;
 665                 }
 666
 667                 // Simplify image codes
 668                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 669
 670                 // Grab all pictures and create attachments out of them
 671                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 672                         foreach ($pictures[1] as $picture) {
 673                                 $imgdata = Image::getInfoFromURL($picture);
 674                                 if ($imgdata) {
 675                                         $attachments[] = ['type' => 'Document',
 676                                                 'mediaType' => $imgdata['mime'],
 677                                                 'url' => $picture,
 678                                                 'name' => null];
 679                                 }
 680                         }
 681                 }
 682
 683                 return $attachments;
 684         }
 685
 686         /**
 687          * Remove image elements and replaces them with links to the image
 688          *
 689          * @param string $body
 690          *
 691          * @return string with replaced elements
 692          */
 693         private static function removePictures($body)
 694         {
 695                 // Simplify image codes
 696                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 697
 698                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 699                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 700
 701                 return $body;
 702         }
 703
 704         /**
 705          * Fetches the "context" value for a givem item array from the "conversation" table
 706          *
 707          * @param array $item
 708          *
 709          * @return string with context url
 710          */
 711         private static function fetchContextURLForItem($item)
 712         {
 713                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 714                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 715                         $context_uri = $conversation['conversation-href'];
 716                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 717                         $context_uri = $conversation['conversation-uri'];
 718                 } else {
 719                         $context_uri = $item['parent-uri'] . '#context';
 720                 }
 721                 return $context_uri;
 722         }
 723
 724         /**
 725          * Returns if the post contains sensitive content ("nsfw")
 726          *
 727          * @param integer $item_id
 728          *
 729          * @return boolean
 730          */
 731         private static function isSensitive($item_id)
 732         {
 733                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 734                 return DBA::exists('term', $condition);
 735         }
 736
 737         /**
 738          * Creates a note/article object array
 739          *
 740          * @param array $item
 741          *
 742          * @return array with the object data
 743          */
 744         public static function createNote($item)
 745         {
 746                 if (!empty($item['title'])) {
 747                         $type = 'Article';
 748                 } else {
 749                         $type = 'Note';
 750                 }
 751
 752                 if ($item['deleted']) {
 753                         $type = 'Tombstone';
 754                 }
 755
 756                 $data = [];
 757                 $data['id'] = $item['uri'];
 758                 $data['type'] = $type;
 759
 760                 if ($item['deleted']) {
 761                         return $data;
 762                 }
 763
 764                 $data['summary'] = null; // Ignore by now
 765
 766                 if ($item['uri'] != $item['thr-parent']) {
 767                         $data['inReplyTo'] = $item['thr-parent'];
 768                 } else {
 769                         $data['inReplyTo'] = null;
 770                 }
 771
 772                 $data['diaspora:guid'] = $item['guid'];
 773                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 774
 775                 if ($item['created'] != $item['edited']) {
 776                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 777                 }
 778
 779                 $data['url'] = $item['plink'];
 780                 $data['attributedTo'] = $item['author-link'];
 781                 $data['sensitive'] = self::isSensitive($item['id']);
 782                 $data['context'] = self::fetchContextURLForItem($item);
 783
 784                 if (!empty($item['title'])) {
 785                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 786                 }
 787
 788                 $body = $item['body'];
 789
 790                 if ($type == 'Note') {
 791                         $body = self::removePictures($body);
 792                 }
 793
 794                 $data['content'] = BBCode::convert($body, false, 7);
 795                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 796
 797                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 798                         $data['diaspora:comment'] = $item['signed_text'];
 799                 }
 800
 801                 $data['attachment'] = self::createAttachmentList($item, $type);
 802                 $data['tag'] = self::createTagList($item);
 803                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 804
 805                 return $data;
 806         }
 807
 808         /**
 809          * Transmits a contact suggestion to a given inbox
 810          *
 811          * @param integer $uid User ID
 812          * @param string $inbox Target inbox
 813          * @param integer $suggestion_id Suggestion ID
 814          */
 815         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 816         {
 817                 $owner = User::getOwnerDataById($uid);
 818                 $profile = APContact::getByURL($owner['url']);
 819
 820                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 821
 822                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 823                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 824                         'type' => 'Announce',
 825                         'actor' => $owner['url'],
 826                         'object' => $suggestion['url'],
 827                         'content' => $suggestion['note'],
 828                         'published' => DateTimeFormat::utc($suggestion['created'] . '+00:00', DateTimeFormat::ATOM),
 829                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 830                         'cc' => []];
 831
 832                 $signed = LDSignature::sign($data, $owner);
 833
 834                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 835                 HTTPSignature::transmit($signed, $inbox, $uid);
 836         }
 837
 838         /**
 839          * Transmits a profile deletion to a given inbox
 840          *
 841          * @param integer $uid User ID
 842          * @param string $inbox Target inbox
 843          */
 844         public static function sendProfileDeletion($uid, $inbox)
 845         {
 846                 $owner = User::getOwnerDataById($uid);
 847                 $profile = APContact::getByURL($owner['url']);
 848
 849                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 850                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 851                         'type' => 'Delete',
 852                         'actor' => $owner['url'],
 853                         'object' => $owner['url'],
 854                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 855                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 856                         'cc' => []];
 857
 858                 $signed = LDSignature::sign($data, $owner);
 859
 860                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 861                 HTTPSignature::transmit($signed, $inbox, $uid);
 862         }
 863
 864         /**
 865          * Transmits a profile change to a given inbox
 866          *
 867          * @param integer $uid User ID
 868          * @param string $inbox Target inbox
 869          */
 870         public static function sendProfileUpdate($uid, $inbox)
 871         {
 872                 $owner = User::getOwnerDataById($uid);
 873                 $profile = APContact::getByURL($owner['url']);
 874
 875                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 876                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 877                         'type' => 'Update',
 878                         'actor' => $owner['url'],
 879                         'object' => self::getProfile($uid),
 880                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 881                         'to' => [$profile['followers']],
 882                         'cc' => []];
 883
 884                 $signed = LDSignature::sign($data, $owner);
 885
 886                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 887                 HTTPSignature::transmit($signed, $inbox, $uid);
 888         }
 889
 890         /**
 891          * Transmits a given activity to a target
 892          *
 893          * @param array $activity
 894          * @param string $target Target profile
 895          * @param integer $uid User ID
 896          */
 897         public static function sendActivity($activity, $target, $uid)
 898         {
 899                 $profile = APContact::getByURL($target);
 900
 901                 $owner = User::getOwnerDataById($uid);
 902
 903                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 904                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 905                         'type' => $activity,
 906                         'actor' => $owner['url'],
 907                         'object' => $profile['url'],
 908                         'to' => $profile['url']];
 909
 910                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 911
 912                 $signed = LDSignature::sign($data, $owner);
 913                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 914         }
 915
 916         /**
 917          * Transmit a message that the contact request had been accepted
 918          *
 919          * @param string $target Target profile
 920          * @param $id
 921          * @param integer $uid User ID
 922          */
 923         public static function sendContactAccept($target, $id, $uid)
 924         {
 925                 $profile = APContact::getByURL($target);
 926
 927                 $owner = User::getOwnerDataById($uid);
 928                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 929                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 930                         'type' => 'Accept',
 931                         'actor' => $owner['url'],
 932                         'object' => ['id' => $id, 'type' => 'Follow',
 933                                 'actor' => $profile['url'],
 934                                 'object' => $owner['url']],
 935                         'to' => $profile['url']];
 936
 937                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 938
 939                 $signed = LDSignature::sign($data, $owner);
 940                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 941         }
 942
 943         /**
 944          * Reject a contact request or terminates the contact relation
 945          *
 946          * @param string $target Target profile
 947          * @param $id
 948          * @param integer $uid User ID
 949          */
 950         public static function sendContactReject($target, $id, $uid)
 951         {
 952                 $profile = APContact::getByURL($target);
 953
 954                 $owner = User::getOwnerDataById($uid);
 955                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 956                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 957                         'type' => 'Reject',
 958                         'actor' => $owner['url'],
 959                         'object' => ['id' => $id, 'type' => 'Follow',
 960                                 'actor' => $profile['url'],
 961                                 'object' => $owner['url']],
 962                         'to' => $profile['url']];
 963
 964                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 965
 966                 $signed = LDSignature::sign($data, $owner);
 967                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 968         }
 969
 970         /**
 971          * Transmits a message that we don't want to follow this contact anymore
 972          *
 973          * @param string $target Target profile
 974          * @param integer $uid User ID
 975          */
 976         public static function sendContactUndo($target, $uid)
 977         {
 978                 $profile = APContact::getByURL($target);
 979
 980                 $id = System::baseUrl() . '/activity/' . System::createGUID();
 981
 982                 $owner = User::getOwnerDataById($uid);
 983                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 984                         'id' => $id,
 985                         'type' => 'Undo',
 986                         'actor' => $owner['url'],
 987                         'object' => ['id' => $id, 'type' => 'Follow',
 988                                 'actor' => $owner['url'],
 989                                 'object' => $profile['url']],
 990                         'to' => $profile['url']];
 991
 992                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 993
 994                 $signed = LDSignature::sign($data, $owner);
 995                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 996         }
 997 }