src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Core\System;
  10 use Friendica\Util\HTTPSignature;
  11 use Friendica\Core\Protocol;
  12 use Friendica\Model\Conversation;
  13 use Friendica\Model\Contact;
  14 use Friendica\Model\APContact;
  15 use Friendica\Model\Item;
  16 use Friendica\Model\Term;
  17 use Friendica\Model\User;
  18 use Friendica\Util\DateTimeFormat;
  19 use Friendica\Content\Text\BBCode;
  20 use Friendica\Util\JsonLD;
  21 use Friendica\Util\LDSignature;
  22 use Friendica\Model\Profile;
  23 use Friendica\Core\Config;
  24 use Friendica\Object\Image;
  25 use Friendica\Protocol\ActivityPub;
  26 use Friendica\Protocol\Diaspora;
  27 use Friendica\Core\Cache;
  28 use Friendica\Util\Map;
  29
  30 require_once 'include/api.php';
  31
  32 /**
  33  * @brief ActivityPub Transmitter Protocol class
  34  *
  35  * To-Do:
  36  *
  37  * Missing object types:
  38  * - Event
  39  *
  40  * Complicated object types:
  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['to'][] = $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                 return $data;
 383         }
 384
 385         /**
 386          * Fetches a list of inboxes of followers of a given user
 387          *
 388          * @param integer $uid User ID
 389          *
 390          * @return array of follower inboxes
 391          */
 392         public static function fetchTargetInboxesforUser($uid)
 393         {
 394                 $inboxes = [];
 395
 396                 $condition = ['uid' => $uid, 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
 397
 398                 if (!empty($uid)) {
 399                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 400                 }
 401
 402                 $contacts = DBA::select('contact', ['notify', 'batch'], $condition);
 403                 while ($contact = DBA::fetch($contacts)) {
 404                         $contact = defaults($contact, 'batch', $contact['notify']);
 405                         $inboxes[$contact] = $contact;
 406                 }
 407                 DBA::close($contacts);
 408
 409                 return $inboxes;
 410         }
 411
 412         /**
 413          * Fetches an array of inboxes for the given item and user
 414          *
 415          * @param array $item
 416          * @param integer $uid User ID
 417          *
 418          * @return array with inboxes
 419          */
 420         public static function fetchTargetInboxes($item, $uid)
 421         {
 422                 $permissions = self::createPermissionBlockForItem($item);
 423                 if (empty($permissions)) {
 424                         return [];
 425                 }
 426
 427                 $inboxes = [];
 428
 429                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 430                         $item_profile = APContact::getByURL($item['author-link']);
 431                 } else {
 432                         $item_profile = APContact::getByURL($item['owner-link']);
 433                 }
 434
 435                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 436                         if (empty($permissions[$element])) {
 437                                 continue;
 438                         }
 439
 440                         foreach ($permissions[$element] as $receiver) {
 441                                 if ($receiver == $item_profile['followers']) {
 442                                         $inboxes = self::fetchTargetInboxesforUser($uid);
 443                                 } else {
 444                                         $profile = APContact::getByURL($receiver);
 445                                         if (!empty($profile)) {
 446                                                 $target = defaults($profile, 'sharedinbox', $profile['inbox']);
 447                                                 $inboxes[$target] = $target;
 448                                         }
 449                                 }
 450                         }
 451                 }
 452
 453                 return $inboxes;
 454         }
 455
 456         /**
 457          * Returns the activity type of a given item
 458          *
 459          * @param array $item
 460          *
 461          * @return string with activity type
 462          */
 463         private static function getTypeOfItem($item)
 464         {
 465                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 466                         $type = 'Announce';
 467                 } elseif ($item['verb'] == ACTIVITY_POST) {
 468                         if ($item['created'] == $item['edited']) {
 469                                 $type = 'Create';
 470                         } else {
 471                                 $type = 'Update';
 472                         }
 473                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 474                         $type = 'Like';
 475                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 476                         $type = 'Dislike';
 477                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 478                         $type = 'Accept';
 479                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 480                         $type = 'Reject';
 481                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 482                         $type = 'TentativeAccept';
 483                 } else {
 484                         $type = '';
 485                 }
 486
 487                 return $type;
 488         }
 489
 490         /**
 491          * Creates the activity or fetches it from the cache
 492          *
 493          * @param integer $item_id
 494          *
 495          * @return array with the activity
 496          */
 497         public static function createCachedActivityFromItem($item_id)
 498         {
 499                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 500                 $data = Cache::get($cachekey);
 501                 if (!is_null($data)) {
 502                         return $data;
 503                 }
 504
 505                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 506
 507                 Cache::set($cachekey, $data, CACHE_QUARTER_HOUR);
 508                 return $data;
 509         }
 510
 511         /**
 512          * Creates an activity array for a given item id
 513          *
 514          * @param integer $item_id
 515          * @param boolean $object_mode Is the activity item is used inside another object?
 516          *
 517          * @return array of activity
 518          */
 519         public static function createActivityFromItem($item_id, $object_mode = false)
 520         {
 521                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 522
 523                 if (!DBA::isResult($item)) {
 524                         return false;
 525                 }
 526
 527                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 528                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 529                 if (DBA::isResult($conversation)) {
 530                         $data = json_decode($conversation['source']);
 531                         if (!empty($data)) {
 532                                 return $data;
 533                         }
 534                 }
 535
 536                 $type = self::getTypeOfItem($item);
 537
 538                 if (!$object_mode) {
 539                         $data = ['@context' => ActivityPub::CONTEXT];
 540
 541                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 542                                 $type = 'Undo';
 543                         } elseif ($item['deleted']) {
 544                                 $type = 'Delete';
 545                         }
 546                 } else {
 547                         $data = [];
 548                 }
 549
 550                 $data['id'] = $item['uri'] . '#' . $type;
 551                 $data['type'] = $type;
 552                 $data['actor'] = $item['owner-link'];
 553
 554                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 555
 556                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 557
 558                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 559
 560                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 561                         $data['object'] = self::createNote($item);
 562                 } elseif ($data['type'] == 'Announce') {
 563                         $data['object'] = self::createAnnounce($item);
 564                 } elseif ($data['type'] == 'Undo') {
 565                         $data['object'] = self::createActivityFromItem($item_id, true);
 566                 } else {
 567                         $data['diaspora:guid'] = $item['guid'];
 568                         $data['object'] = $item['thr-parent'];
 569                 }
 570
 571                 $owner = User::getOwnerDataById($item['uid']);
 572
 573                 if (!$object_mode) {
 574                         return LDSignature::sign($data, $owner);
 575                 } else {
 576                         return $data;
 577                 }
 578
 579                 /// @todo Create "conversation" entry
 580         }
 581
 582         /**
 583          * Creates an object array for a given item id
 584          *
 585          * @param integer $item_id
 586          *
 587          * @return array with the object data
 588          */
 589         public static function createObjectFromItemID($item_id)
 590         {
 591                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 592
 593                 if (!DBA::isResult($item)) {
 594                         return false;
 595                 }
 596
 597                 $data = ['@context' => ActivityPub::CONTEXT];
 598                 $data = array_merge($data, self::createNote($item));
 599
 600                 return $data;
 601         }
 602
 603         /**
 604          * Creates a location entry for a given item array
 605          *
 606          * @param array $item
 607          *
 608          * @return array with location array
 609          */
 610         private static function createLocation($item)
 611         {
 612                 $location = ['type' => 'Place'];
 613
 614                 if (!empty($item['location'])) {
 615                         $location['name'] = $item['location'];
 616                 }
 617
 618                 $coord = [];
 619
 620                 if (empty($item['coord'])) {
 621                         $coord = Map::getCoordinates($item['location']);
 622                 } else {
 623                         $coords = explode(' ', $item['coord']);
 624                         if (count($coords) == 2) {
 625                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 626                         }
 627                 }
 628
 629                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 630                         $location['latitude'] = $coord['lat'];
 631                         $location['longitude'] = $coord['lon'];
 632                 }
 633
 634                 return $location;
 635         }
 636
 637         /**
 638          * Returns a tag array for a given item array
 639          *
 640          * @param array $item
 641          *
 642          * @return array of tags
 643          */
 644         private static function createTagList($item)
 645         {
 646                 $tags = [];
 647
 648                 $terms = Term::tagArrayFromItemId($item['id']);
 649                 foreach ($terms as $term) {
 650                         if ($term['type'] == TERM_HASHTAG) {
 651                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 652                         } elseif ($term['type'] == TERM_MENTION) {
 653                                 $contact = Contact::getDetailsByURL($term['url']);
 654                                 if (!empty($contact['addr'])) {
 655                                         $mention = '@' . $contact['addr'];
 656                                 } else {
 657                                         $mention = '@' . $term['url'];
 658                                 }
 659
 660                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 661                         }
 662                 }
 663                 return $tags;
 664         }
 665
 666         /**
 667          * Adds attachment data to the JSON document
 668          *
 669          * @param array $item Data of the item that is to be posted
 670          * @param text $type Object type
 671          *
 672          * @return array with attachment data
 673          */
 674         private static function createAttachmentList($item, $type)
 675         {
 676                 $attachments = [];
 677
 678                 $arr = explode('[/attach],', $item['attach']);
 679                 if (count($arr)) {
 680                         foreach ($arr as $r) {
 681                                 $matches = false;
 682                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 683                                 if ($cnt) {
 684                                         $attributes = ['type' => 'Document',
 685                                                         'mediaType' => $matches[3],
 686                                                         'url' => $matches[1],
 687                                                         'name' => null];
 688
 689                                         if (trim($matches[4]) != '') {
 690                                                 $attributes['name'] = trim($matches[4]);
 691                                         }
 692
 693                                         $attachments[] = $attributes;
 694                                 }
 695                         }
 696                 }
 697
 698                 if ($type != 'Note') {
 699                         return $attachments;
 700                 }
 701
 702                 // Simplify image codes
 703                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 704
 705                 // Grab all pictures and create attachments out of them
 706                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 707                         foreach ($pictures[1] as $picture) {
 708                                 $imgdata = Image::getInfoFromURL($picture);
 709                                 if ($imgdata) {
 710                                         $attachments[] = ['type' => 'Document',
 711                                                 'mediaType' => $imgdata['mime'],
 712                                                 'url' => $picture,
 713                                                 'name' => null];
 714                                 }
 715                         }
 716                 }
 717
 718                 return $attachments;
 719         }
 720
 721         /**
 722          * Remove image elements and replaces them with links to the image
 723          *
 724          * @param string $body
 725          *
 726          * @return string with replaced elements
 727          */
 728         private static function removePictures($body)
 729         {
 730                 // Simplify image codes
 731                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 732
 733                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 734                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 735
 736                 return $body;
 737         }
 738
 739         /**
 740          * Fetches the "context" value for a givem item array from the "conversation" table
 741          *
 742          * @param array $item
 743          *
 744          * @return string with context url
 745          */
 746         private static function fetchContextURLForItem($item)
 747         {
 748                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 749                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 750                         $context_uri = $conversation['conversation-href'];
 751                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 752                         $context_uri = $conversation['conversation-uri'];
 753                 } else {
 754                         $context_uri = $item['parent-uri'] . '#context';
 755                 }
 756                 return $context_uri;
 757         }
 758
 759         /**
 760          * Returns if the post contains sensitive content ("nsfw")
 761          *
 762          * @param integer $item_id
 763          *
 764          * @return boolean
 765          */
 766         private static function isSensitive($item_id)
 767         {
 768                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 769                 return DBA::exists('term', $condition);
 770         }
 771
 772         /**
 773          * Creates a note/article object array
 774          *
 775          * @param array $item
 776          *
 777          * @return array with the object data
 778          */
 779         public static function createNote($item)
 780         {
 781                 if (!empty($item['title'])) {
 782                         $type = 'Article';
 783                 } else {
 784                         $type = 'Note';
 785                 }
 786
 787                 if ($item['deleted']) {
 788                         $type = 'Tombstone';
 789                 }
 790
 791                 $data = [];
 792                 $data['id'] = $item['uri'];
 793                 $data['type'] = $type;
 794
 795                 if ($item['deleted']) {
 796                         return $data;
 797                 }
 798
 799                 $data['summary'] = null; // Ignore by now
 800
 801                 if ($item['uri'] != $item['thr-parent']) {
 802                         $data['inReplyTo'] = $item['thr-parent'];
 803                 } else {
 804                         $data['inReplyTo'] = null;
 805                 }
 806
 807                 $data['diaspora:guid'] = $item['guid'];
 808                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 809
 810                 if ($item['created'] != $item['edited']) {
 811                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 812                 }
 813
 814                 $data['url'] = $item['plink'];
 815                 $data['attributedTo'] = $item['author-link'];
 816                 $data['sensitive'] = self::isSensitive($item['id']);
 817                 $data['context'] = self::fetchContextURLForItem($item);
 818
 819                 if (!empty($item['title'])) {
 820                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 821                 }
 822
 823                 $body = $item['body'];
 824
 825                 if ($type == 'Note') {
 826                         $body = self::removePictures($body);
 827                 }
 828
 829                 $data['content'] = BBCode::convert($body, false, 7);
 830                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 831
 832                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 833                         $data['diaspora:comment'] = $item['signed_text'];
 834                 }
 835
 836                 $data['attachment'] = self::createAttachmentList($item, $type);
 837                 $data['tag'] = self::createTagList($item);
 838
 839                 if (!empty($item['coord']) || !empty($item['location'])) {
 840                         $data['location'] = self::createLocation($item);
 841                 }
 842
 843                 if (!empty($item['app'])) {
 844                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 845                 }
 846
 847                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 848
 849                 return $data;
 850         }
 851
 852         /**
 853          * Creates an announce object entry
 854          *
 855          * @param array $item
 856          *
 857          * @return string with announced object url
 858          */
 859         public static function createAnnounce($item)
 860         {
 861                 $announce = api_share_as_retweet($item);
 862                 if (empty($announce['plink'])) {
 863                         return self::createNote($item);
 864                 }
 865
 866                 return $announce['plink'];
 867         }
 868
 869         /**
 870          * Transmits a contact suggestion to a given inbox
 871          *
 872          * @param integer $uid User ID
 873          * @param string $inbox Target inbox
 874          * @param integer $suggestion_id Suggestion ID
 875          */
 876         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 877         {
 878                 $owner = User::getOwnerDataById($uid);
 879                 $profile = APContact::getByURL($owner['url']);
 880
 881                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 882
 883                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 884                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 885                         'type' => 'Announce',
 886                         'actor' => $owner['url'],
 887                         'object' => $suggestion['url'],
 888                         'content' => $suggestion['note'],
 889                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 890                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 891                         'cc' => []];
 892
 893                 $signed = LDSignature::sign($data, $owner);
 894
 895                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 896                 HTTPSignature::transmit($signed, $inbox, $uid);
 897         }
 898
 899         /**
 900          * Transmits a profile deletion to a given inbox
 901          *
 902          * @param integer $uid User ID
 903          * @param string $inbox Target inbox
 904          */
 905         public static function sendProfileDeletion($uid, $inbox)
 906         {
 907                 $owner = User::getOwnerDataById($uid);
 908                 $profile = APContact::getByURL($owner['url']);
 909
 910                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 911                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 912                         'type' => 'Delete',
 913                         'actor' => $owner['url'],
 914                         'object' => $owner['url'],
 915                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 916                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 917                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 918                         'cc' => []];
 919
 920                 $signed = LDSignature::sign($data, $owner);
 921
 922                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 923                 HTTPSignature::transmit($signed, $inbox, $uid);
 924         }
 925
 926         /**
 927          * Transmits a profile change to a given inbox
 928          *
 929          * @param integer $uid User ID
 930          * @param string $inbox Target inbox
 931          */
 932         public static function sendProfileUpdate($uid, $inbox)
 933         {
 934                 $owner = User::getOwnerDataById($uid);
 935                 $profile = APContact::getByURL($owner['url']);
 936
 937                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 938                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 939                         'type' => 'Update',
 940                         'actor' => $owner['url'],
 941                         'object' => self::getProfile($uid),
 942                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 943                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 944                         'to' => [$profile['followers']],
 945                         'cc' => []];
 946
 947                 $signed = LDSignature::sign($data, $owner);
 948
 949                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 950                 HTTPSignature::transmit($signed, $inbox, $uid);
 951         }
 952
 953         /**
 954          * Transmits a given activity to a target
 955          *
 956          * @param array $activity
 957          * @param string $target Target profile
 958          * @param integer $uid User ID
 959          */
 960         public static function sendActivity($activity, $target, $uid)
 961         {
 962                 $profile = APContact::getByURL($target);
 963
 964                 $owner = User::getOwnerDataById($uid);
 965
 966                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 967                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 968                         'type' => $activity,
 969                         'actor' => $owner['url'],
 970                         'object' => $profile['url'],
 971                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
 972                         'to' => $profile['url']];
 973
 974                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 975
 976                 $signed = LDSignature::sign($data, $owner);
 977                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 978         }
 979
 980         /**
 981          * Transmit a message that the contact request had been accepted
 982          *
 983          * @param string $target Target profile
 984          * @param $id
 985          * @param integer $uid User ID
 986          */
 987         public static function sendContactAccept($target, $id, $uid)
 988         {
 989                 $profile = APContact::getByURL($target);
 990
 991                 $owner = User::getOwnerDataById($uid);
 992                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 993                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 994                         'type' => 'Accept',
 995                         'actor' => $owner['url'],
 996                         'object' => ['id' => $id, 'type' => 'Follow',
 997                                 'actor' => $profile['url'],
 998                                 'object' => $owner['url']],
 999                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1000                         'to' => $profile['url']];
1001
1002                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1003
1004                 $signed = LDSignature::sign($data, $owner);
1005                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1006         }
1007
1008         /**
1009          * Reject a contact request or terminates the contact relation
1010          *
1011          * @param string $target Target profile
1012          * @param $id
1013          * @param integer $uid User ID
1014          */
1015         public static function sendContactReject($target, $id, $uid)
1016         {
1017                 $profile = APContact::getByURL($target);
1018
1019                 $owner = User::getOwnerDataById($uid);
1020                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1021                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1022                         'type' => 'Reject',
1023                         'actor' => $owner['url'],
1024                         'object' => ['id' => $id, 'type' => 'Follow',
1025                                 'actor' => $profile['url'],
1026                                 'object' => $owner['url']],
1027                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1028                         'to' => $profile['url']];
1029
1030                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1031
1032                 $signed = LDSignature::sign($data, $owner);
1033                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1034         }
1035
1036         /**
1037          * Transmits a message that we don't want to follow this contact anymore
1038          *
1039          * @param string $target Target profile
1040          * @param integer $uid User ID
1041          */
1042         public static function sendContactUndo($target, $uid)
1043         {
1044                 $profile = APContact::getByURL($target);
1045
1046                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1047
1048                 $owner = User::getOwnerDataById($uid);
1049                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1050                         'id' => $id,
1051                         'type' => 'Undo',
1052                         'actor' => $owner['url'],
1053                         'object' => ['id' => $id, 'type' => 'Follow',
1054                                 'actor' => $owner['url'],
1055                                 'object' => $profile['url']],
1056                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1057                         'to' => $profile['url']];
1058
1059                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1060
1061                 $signed = LDSignature::sign($data, $owner);
1062                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1063         }
1064 }