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\Protocol\Diaspora;
  26 use Friendica\Core\Cache;
  27 use Friendica\Util\Map;
  28
  29 require_once 'include/api.php';
  30
  31 /**
  32  * @brief ActivityPub Transmitter Protocol class
  33  *
  34  * To-Do:
  35  *
  36  * Missing object types:
  37  * - Event
  38  *
  39  * Complicated object types:
  40  * - Undo Announce
  41  *
  42  * General:
  43  * - Queueing unsucessful deliveries
  44  */
  45 class Transmitter
  46 {
  47         /**
  48          * collects the lost of followers of the given owner
  49          *
  50          * @param array $owner Owner array
  51          * @param integer $page Page number
  52          *
  53          * @return array of owners
  54          */
  55         public static function getFollowers($owner, $page = null)
  56         {
  57                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  58                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  59                 $count = DBA::count('contact', $condition);
  60
  61                 $data = ['@context' => ActivityPub::CONTEXT];
  62                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  63                 $data['type'] = 'OrderedCollection';
  64                 $data['totalItems'] = $count;
  65
  66                 // When we hide our friends we will only show the pure number but don't allow more.
  67                 $profile = Profile::getByUID($owner['uid']);
  68                 if (!empty($profile['hide-friends'])) {
  69                         return $data;
  70                 }
  71
  72                 if (empty($page)) {
  73                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  74                 } else {
  75                         $list = [];
  76
  77                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  78                         while ($contact = DBA::fetch($contacts)) {
  79                                 $list[] = $contact['url'];
  80                         }
  81
  82                         if (!empty($list)) {
  83                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  84                         }
  85
  86                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  87
  88                         $data['orderedItems'] = $list;
  89                 }
  90
  91                 return $data;
  92         }
  93
  94         /**
  95          * Create list of following contacts
  96          *
  97          * @param array $owner Owner array
  98          * @param integer $page Page numbe
  99          *
 100          * @return array of following contacts
 101          */
 102         public static function getFollowing($owner, $page = null)
 103         {
 104                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 105                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 106                 $count = DBA::count('contact', $condition);
 107
 108                 $data = ['@context' => ActivityPub::CONTEXT];
 109                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 110                 $data['type'] = 'OrderedCollection';
 111                 $data['totalItems'] = $count;
 112
 113                 // When we hide our friends we will only show the pure number but don't allow more.
 114                 $profile = Profile::getByUID($owner['uid']);
 115                 if (!empty($profile['hide-friends'])) {
 116                         return $data;
 117                 }
 118
 119                 if (empty($page)) {
 120                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 121                 } else {
 122                         $list = [];
 123
 124                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 125                         while ($contact = DBA::fetch($contacts)) {
 126                                 $list[] = $contact['url'];
 127                         }
 128
 129                         if (!empty($list)) {
 130                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 131                         }
 132
 133                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 134
 135                         $data['orderedItems'] = $list;
 136                 }
 137
 138                 return $data;
 139         }
 140
 141         /**
 142          * Public posts for the given owner
 143          *
 144          * @param array $owner Owner array
 145          * @param integer $page Page numbe
 146          *
 147          * @return array of posts
 148          */
 149         public static function getOutbox($owner, $page = null)
 150         {
 151                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 152
 153                 $condition = ['uid' => $owner['uid'], 'contact-id' => $owner['id'], 'author-id' => $public_contact,
 154                         'wall' => true, 'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 155                         'deleted' => false, 'visible' => true];
 156                 $count = DBA::count('item', $condition);
 157
 158                 $data = ['@context' => ActivityPub::CONTEXT];
 159                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 160                 $data['type'] = 'OrderedCollection';
 161                 $data['totalItems'] = $count;
 162
 163                 if (empty($page)) {
 164                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 165                 } else {
 166                         $list = [];
 167
 168                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 169
 170                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 171                         while ($item = Item::fetch($items)) {
 172                                 $object = self::createObjectFromItemID($item['id']);
 173                                 unset($object['@context']);
 174                                 $list[] = $object;
 175                         }
 176
 177                         if (!empty($list)) {
 178                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 179                         }
 180
 181                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 182
 183                         $data['orderedItems'] = $list;
 184                 }
 185
 186                 return $data;
 187         }
 188
 189         /**
 190          * Return the ActivityPub profile of the given user
 191          *
 192          * @param integer $uid User ID
 193          * @return array with profile data
 194          */
 195         public static function getProfile($uid)
 196         {
 197                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 198                         'account_removed' => false, 'verified' => true];
 199                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 200                 $user = DBA::selectFirst('user', $fields, $condition);
 201                 if (!DBA::isResult($user)) {
 202                         return [];
 203                 }
 204
 205                 $fields = ['locality', 'region', 'country-name'];
 206                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 207                 if (!DBA::isResult($profile)) {
 208                         return [];
 209                 }
 210
 211                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 212                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 213                 if (!DBA::isResult($contact)) {
 214                         return [];
 215                 }
 216
 217                 // On old installations and never changed contacts this might not be filled
 218                 if (empty($contact['avatar'])) {
 219                         $contact['avatar'] = $contact['photo'];
 220                 }
 221
 222                 $data = ['@context' => ActivityPub::CONTEXT];
 223                 $data['id'] = $contact['url'];
 224                 $data['diaspora:guid'] = $user['guid'];
 225                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 226                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 227                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 228                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 229                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 230                 $data['preferredUsername'] = $user['nickname'];
 231                 $data['name'] = $contact['name'];
 232                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 233                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 234                 $data['summary'] = $contact['about'];
 235                 $data['url'] = $contact['url'];
 236                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 237                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 238                         'owner' => $contact['url'],
 239                         'publicKeyPem' => $user['pubkey']];
 240                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 241                 $data['icon'] = ['type' => 'Image',
 242                         'url' => $contact['avatar']];
 243
 244                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 245                 return $data;
 246         }
 247
 248         /**
 249          * Returns an array with permissions of a given item array
 250          *
 251          * @param array $item
 252          *
 253          * @return array with permissions
 254          */
 255         private static function fetchPermissionBlockFromConversation($item)
 256         {
 257                 if (empty($item['thr-parent'])) {
 258                         return [];
 259                 }
 260
 261                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 262                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 263                 if (!DBA::isResult($conversation)) {
 264                         return [];
 265                 }
 266
 267                 $activity = json_decode($conversation['source'], true);
 268
 269                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 270                 $profile = APContact::getByURL($actor);
 271
 272                 $item_profile = APContact::getByURL($item['author-link']);
 273                 $exclude[] = $item['author-link'];
 274
 275                 if ($item['gravity'] == GRAVITY_PARENT) {
 276                         $exclude[] = $item['owner-link'];
 277                 }
 278
 279                 $permissions['to'][] = $actor;
 280
 281                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 282                         if (empty($activity[$element])) {
 283                                 continue;
 284                         }
 285                         if (is_string($activity[$element])) {
 286                                 $activity[$element] = [$activity[$element]];
 287                         }
 288
 289                         foreach ($activity[$element] as $receiver) {
 290                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 291                                         $receiver = $item_profile['followers'];
 292                                 }
 293                                 if (!in_array($receiver, $exclude)) {
 294                                         $permissions[$element][] = $receiver;
 295                                 }
 296                         }
 297                 }
 298                 return $permissions;
 299         }
 300
 301         /**
 302          * Creates an array of permissions from an item thread
 303          *
 304          * @param array $item
 305          *
 306          * @return array with permission data
 307          */
 308         private static function createPermissionBlockForItem($item)
 309         {
 310                 $data = ['to' => [], 'cc' => []];
 311
 312                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 313
 314                 $actor_profile = APContact::getByURL($item['author-link']);
 315
 316                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 317
 318                 $contacts[$item['author-link']] = $item['author-link'];
 319
 320                 if (!$item['private']) {
 321                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 322                         if (!empty($actor_profile['followers'])) {
 323                                 $data['cc'][] = $actor_profile['followers'];
 324                         }
 325
 326                         foreach ($terms as $term) {
 327                                 $profile = APContact::getByURL($term['url'], false);
 328                                 if (!empty($profile) && empty($contacts[$profile['url']])) {
 329                                         $data['to'][] = $profile['url'];
 330                                         $contacts[$profile['url']] = $profile['url'];
 331                                 }
 332                         }
 333                 } else {
 334                         $receiver_list = Item::enumeratePermissions($item);
 335
 336                         $mentioned = [];
 337
 338                         foreach ($terms as $term) {
 339                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 340                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 341                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
 342                                         $data['to'][] = $contact['url'];
 343                                         $contacts[$contact['url']] = $contact['url'];
 344                                 }
 345                         }
 346
 347                         foreach ($receiver_list as $receiver) {
 348                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
 349                                 if (empty($contacts[$contact['url']])) {
 350                                         $data['cc'][] = $contact['url'];
 351                                         $contacts[$contact['url']] = $contact['url'];
 352                                 }
 353                         }
 354                 }
 355
 356                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
 357                 while ($parent = Item::fetch($parents)) {
 358                         // Don't include data from future posts
 359                         if ($parent['id'] >= $item['id']) {
 360                                 continue;
 361                         }
 362
 363                         $profile = APContact::getByURL($parent['author-link'], false);
 364                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 365                                 $data['cc'][] = $profile['url'];
 366                                 $contacts[$profile['url']] = $profile['url'];
 367                         }
 368
 369                         if ($item['gravity'] != GRAVITY_PARENT) {
 370                                 continue;
 371                         }
 372
 373                         $profile = APContact::getByURL($parent['owner-link'], false);
 374                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 375                                 $data['cc'][] = $profile['url'];
 376                                 $contacts[$profile['url']] = $profile['url'];
 377                         }
 378                 }
 379                 DBA::close($parents);
 380
 381                 return $data;
 382         }
 383
 384         /**
 385          * Fetches a list of inboxes of followers of a given user
 386          *
 387          * @param integer $uid User ID
 388          *
 389          * @return array of follower inboxes
 390          */
 391         public static function fetchTargetInboxesforUser($uid)
 392         {
 393                 $inboxes = [];
 394
 395                 $condition = ['uid' => $uid, 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
 396
 397                 if (!empty($uid)) {
 398                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 399                 }
 400
 401                 $contacts = DBA::select('contact', ['notify', 'batch'], $condition);
 402                 while ($contact = DBA::fetch($contacts)) {
 403                         $contact = defaults($contact, 'batch', $contact['notify']);
 404                         $inboxes[$contact] = $contact;
 405                 }
 406                 DBA::close($contacts);
 407
 408                 return $inboxes;
 409         }
 410
 411         /**
 412          * Fetches an array of inboxes for the given item and user
 413          *
 414          * @param array $item
 415          * @param integer $uid User ID
 416          *
 417          * @return array with inboxes
 418          */
 419         public static function fetchTargetInboxes($item, $uid)
 420         {
 421                 $permissions = self::createPermissionBlockForItem($item);
 422                 if (empty($permissions)) {
 423                         return [];
 424                 }
 425
 426                 $inboxes = [];
 427
 428                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 429                         $item_profile = APContact::getByURL($item['author-link']);
 430                 } else {
 431                         $item_profile = APContact::getByURL($item['owner-link']);
 432                 }
 433
 434                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 435                         if (empty($permissions[$element])) {
 436                                 continue;
 437                         }
 438
 439                         foreach ($permissions[$element] as $receiver) {
 440                                 if ($receiver == $item_profile['followers']) {
 441                                         $inboxes = self::fetchTargetInboxesforUser($uid);
 442                                 } else {
 443                                         $profile = APContact::getByURL($receiver);
 444                                         if (!empty($profile)) {
 445                                                 $target = defaults($profile, 'sharedinbox', $profile['inbox']);
 446                                                 $inboxes[$target] = $target;
 447                                         }
 448                                 }
 449                         }
 450                 }
 451
 452                 return $inboxes;
 453         }
 454
 455         /**
 456          * Returns the activity type of a given item
 457          *
 458          * @param array $item
 459          *
 460          * @return string with activity type
 461          */
 462         private static function getTypeOfItem($item)
 463         {
 464                 if (!empty(Diaspora::isReshare($item['body'], false))) {
 465                         $type = 'Announce';
 466                 } elseif ($item['verb'] == ACTIVITY_POST) {
 467                         if ($item['created'] == $item['edited']) {
 468                                 $type = 'Create';
 469                         } else {
 470                                 $type = 'Update';
 471                         }
 472                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 473                         $type = 'Like';
 474                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 475                         $type = 'Dislike';
 476                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 477                         $type = 'Accept';
 478                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 479                         $type = 'Reject';
 480                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 481                         $type = 'TentativeAccept';
 482                 } else {
 483                         $type = '';
 484                 }
 485
 486                 return $type;
 487         }
 488
 489         /**
 490          * Creates the activity or fetches it from the cache
 491          *
 492          * @param integer $item_id
 493          *
 494          * @return array with the activity
 495          */
 496         public static function createCachedActivityFromItem($item_id)
 497         {
 498                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 499                 $data = Cache::get($cachekey);
 500                 if (!is_null($data)) {
 501                         return $data;
 502                 }
 503
 504                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 505
 506                 Cache::set($cachekey, $data, CACHE_QUARTER_HOUR);
 507                 return $data;
 508         }
 509
 510         /**
 511          * Creates an activity array for a given item id
 512          *
 513          * @param integer $item_id
 514          * @param boolean $object_mode Is the activity item is used inside another object?
 515          *
 516          * @return array of activity
 517          */
 518         public static function createActivityFromItem($item_id, $object_mode = false)
 519         {
 520                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 521
 522                 if (!DBA::isResult($item)) {
 523                         return false;
 524                 }
 525
 526                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 527                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 528                 if (DBA::isResult($conversation)) {
 529                         $data = json_decode($conversation['source']);
 530                         if (!empty($data)) {
 531                                 return $data;
 532                         }
 533                 }
 534
 535                 $type = self::getTypeOfItem($item);
 536
 537                 if (!$object_mode) {
 538                         $data = ['@context' => ActivityPub::CONTEXT];
 539
 540                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 541                                 $type = 'Undo';
 542                         } elseif ($item['deleted']) {
 543                                 $type = 'Delete';
 544                         }
 545                 } else {
 546                         $data = [];
 547                 }
 548
 549                 $data['id'] = $item['uri'] . '#' . $type;
 550                 $data['type'] = $type;
 551                 $data['actor'] = $item['owner-link'];
 552
 553                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 554
 555                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 556
 557                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 558                         $data['object'] = self::createNote($item);
 559                 } elseif ($data['type'] == 'Announce') {
 560                         $data['object'] = self::createAnnounce($item);
 561                 } elseif ($data['type'] == 'Undo') {
 562                         $data['object'] = self::createActivityFromItem($item_id, true);
 563                 } else {
 564                         $data['diaspora:guid'] = $item['guid'];
 565                         $data['object'] = $item['thr-parent'];
 566                 }
 567
 568                 $owner = User::getOwnerDataById($item['uid']);
 569
 570                 if (!$object_mode) {
 571                         return LDSignature::sign($data, $owner);
 572                 } else {
 573                         return $data;
 574                 }
 575
 576                 /// @todo Create "conversation" entry
 577         }
 578
 579         /**
 580          * Creates an object array for a given item id
 581          *
 582          * @param integer $item_id
 583          *
 584          * @return array with the object data
 585          */
 586         public static function createObjectFromItemID($item_id)
 587         {
 588                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 589
 590                 if (!DBA::isResult($item)) {
 591                         return false;
 592                 }
 593
 594                 $data = ['@context' => ActivityPub::CONTEXT];
 595                 $data = array_merge($data, self::createNote($item));
 596
 597                 return $data;
 598         }
 599
 600         /**
 601          * Creates a location entry for a given item array
 602          *
 603          * @param array $item
 604          *
 605          * @return array with location array
 606          */
 607         private static function createLocation($item)
 608         {
 609                 $location = ['type' => 'Place'];
 610
 611                 if (!empty($item['location'])) {
 612                         $location['name'] = $item['location'];
 613                 }
 614
 615                 $coord = [];
 616
 617                 if (empty($item['coord'])) {
 618                         $coord = Map::getCoordinates($item['location']);
 619                 } else {
 620                         $coords = explode(' ', $item['coord']);
 621                         if (count($coords) == 2) {
 622                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 623                         }
 624                 }
 625
 626                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 627                         $location['latitude'] = $coord['lat'];
 628                         $location['longitude'] = $coord['lon'];
 629                 }
 630
 631                 return $location;
 632         }
 633
 634         /**
 635          * Returns a tag array for a given item array
 636          *
 637          * @param array $item
 638          *
 639          * @return array of tags
 640          */
 641         private static function createTagList($item)
 642         {
 643                 $tags = [];
 644
 645                 $terms = Term::tagArrayFromItemId($item['id']);
 646                 foreach ($terms as $term) {
 647                         if ($term['type'] == TERM_HASHTAG) {
 648                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 649                         } elseif ($term['type'] == TERM_MENTION) {
 650                                 $contact = Contact::getDetailsByURL($term['url']);
 651                                 if (!empty($contact['addr'])) {
 652                                         $mention = '@' . $contact['addr'];
 653                                 } else {
 654                                         $mention = '@' . $term['url'];
 655                                 }
 656
 657                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 658                         }
 659                 }
 660                 return $tags;
 661         }
 662
 663         /**
 664          * Adds attachment data to the JSON document
 665          *
 666          * @param array $item Data of the item that is to be posted
 667          * @param text $type Object type
 668          *
 669          * @return array with attachment data
 670          */
 671         private static function createAttachmentList($item, $type)
 672         {
 673                 $attachments = [];
 674
 675                 $arr = explode('[/attach],', $item['attach']);
 676                 if (count($arr)) {
 677                         foreach ($arr as $r) {
 678                                 $matches = false;
 679                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 680                                 if ($cnt) {
 681                                         $attributes = ['type' => 'Document',
 682                                                         'mediaType' => $matches[3],
 683                                                         'url' => $matches[1],
 684                                                         'name' => null];
 685
 686                                         if (trim($matches[4]) != '') {
 687                                                 $attributes['name'] = trim($matches[4]);
 688                                         }
 689
 690                                         $attachments[] = $attributes;
 691                                 }
 692                         }
 693                 }
 694
 695                 if ($type != 'Note') {
 696                         return $attachments;
 697                 }
 698
 699                 // Simplify image codes
 700                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 701
 702                 // Grab all pictures and create attachments out of them
 703                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 704                         foreach ($pictures[1] as $picture) {
 705                                 $imgdata = Image::getInfoFromURL($picture);
 706                                 if ($imgdata) {
 707                                         $attachments[] = ['type' => 'Document',
 708                                                 'mediaType' => $imgdata['mime'],
 709                                                 'url' => $picture,
 710                                                 'name' => null];
 711                                 }
 712                         }
 713                 }
 714
 715                 return $attachments;
 716         }
 717
 718         /**
 719          * Remove image elements and replaces them with links to the image
 720          *
 721          * @param string $body
 722          *
 723          * @return string with replaced elements
 724          */
 725         private static function removePictures($body)
 726         {
 727                 // Simplify image codes
 728                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 729
 730                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 731                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 732
 733                 return $body;
 734         }
 735
 736         /**
 737          * Fetches the "context" value for a givem item array from the "conversation" table
 738          *
 739          * @param array $item
 740          *
 741          * @return string with context url
 742          */
 743         private static function fetchContextURLForItem($item)
 744         {
 745                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 746                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 747                         $context_uri = $conversation['conversation-href'];
 748                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 749                         $context_uri = $conversation['conversation-uri'];
 750                 } else {
 751                         $context_uri = $item['parent-uri'] . '#context';
 752                 }
 753                 return $context_uri;
 754         }
 755
 756         /**
 757          * Returns if the post contains sensitive content ("nsfw")
 758          *
 759          * @param integer $item_id
 760          *
 761          * @return boolean
 762          */
 763         private static function isSensitive($item_id)
 764         {
 765                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 766                 return DBA::exists('term', $condition);
 767         }
 768
 769         /**
 770          * Creates a note/article object array
 771          *
 772          * @param array $item
 773          *
 774          * @return array with the object data
 775          */
 776         public static function createNote($item)
 777         {
 778                 if (!empty($item['title'])) {
 779                         $type = 'Article';
 780                 } else {
 781                         $type = 'Note';
 782                 }
 783
 784                 if ($item['deleted']) {
 785                         $type = 'Tombstone';
 786                 }
 787
 788                 $data = [];
 789                 $data['id'] = $item['uri'];
 790                 $data['type'] = $type;
 791
 792                 if ($item['deleted']) {
 793                         return $data;
 794                 }
 795
 796                 $data['summary'] = null; // Ignore by now
 797
 798                 if ($item['uri'] != $item['thr-parent']) {
 799                         $data['inReplyTo'] = $item['thr-parent'];
 800                 } else {
 801                         $data['inReplyTo'] = null;
 802                 }
 803
 804                 $data['diaspora:guid'] = $item['guid'];
 805                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 806
 807                 if ($item['created'] != $item['edited']) {
 808                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 809                 }
 810
 811                 $data['url'] = $item['plink'];
 812                 $data['attributedTo'] = $item['author-link'];
 813                 $data['sensitive'] = self::isSensitive($item['id']);
 814                 $data['context'] = self::fetchContextURLForItem($item);
 815
 816                 if (!empty($item['title'])) {
 817                         $data['name'] = BBCode::toPlaintext($item['title'], false);
 818                 }
 819
 820                 $body = $item['body'];
 821
 822                 if ($type == 'Note') {
 823                         $body = self::removePictures($body);
 824                 }
 825
 826                 $data['content'] = BBCode::convert($body, false, 7);
 827                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 828
 829                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 830                         $data['diaspora:comment'] = $item['signed_text'];
 831                 }
 832
 833                 $data['attachment'] = self::createAttachmentList($item, $type);
 834                 $data['tag'] = self::createTagList($item);
 835
 836                 if (!empty($item['coord']) || !empty($item['location'])) {
 837                         $data['location'] = self::createLocation($item);
 838                 }
 839
 840                 if (!empty($item['app'])) {
 841                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
 842                 }
 843
 844                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 845
 846                 return $data;
 847         }
 848
 849         /**
 850          * Creates an announce object entry
 851          *
 852          * @param array $item
 853          *
 854          * @return string with announced object url
 855          */
 856         public static function createAnnounce($item)
 857         {
 858                 $announce = api_share_as_retweet($item);
 859                 if (empty($announce['plink'])) {
 860                         return self::createNote($item);
 861                 }
 862
 863                 return $announce['plink'];
 864         }
 865
 866         /**
 867          * Transmits a contact suggestion to a given inbox
 868          *
 869          * @param integer $uid User ID
 870          * @param string $inbox Target inbox
 871          * @param integer $suggestion_id Suggestion ID
 872          */
 873         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
 874         {
 875                 $owner = User::getOwnerDataById($uid);
 876                 $profile = APContact::getByURL($owner['url']);
 877
 878                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
 879
 880                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 881                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 882                         'type' => 'Announce',
 883                         'actor' => $owner['url'],
 884                         'object' => $suggestion['url'],
 885                         'content' => $suggestion['note'],
 886                         'published' => DateTimeFormat::utc($suggestion['created'] . '+00:00', DateTimeFormat::ATOM),
 887                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 888                         'cc' => []];
 889
 890                 $signed = LDSignature::sign($data, $owner);
 891
 892                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 893                 HTTPSignature::transmit($signed, $inbox, $uid);
 894         }
 895
 896         /**
 897          * Transmits a profile deletion to a given inbox
 898          *
 899          * @param integer $uid User ID
 900          * @param string $inbox Target inbox
 901          */
 902         public static function sendProfileDeletion($uid, $inbox)
 903         {
 904                 $owner = User::getOwnerDataById($uid);
 905                 $profile = APContact::getByURL($owner['url']);
 906
 907                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 908                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 909                         'type' => 'Delete',
 910                         'actor' => $owner['url'],
 911                         'object' => $owner['url'],
 912                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 913                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 914                         'cc' => []];
 915
 916                 $signed = LDSignature::sign($data, $owner);
 917
 918                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 919                 HTTPSignature::transmit($signed, $inbox, $uid);
 920         }
 921
 922         /**
 923          * Transmits a profile change to a given inbox
 924          *
 925          * @param integer $uid User ID
 926          * @param string $inbox Target inbox
 927          */
 928         public static function sendProfileUpdate($uid, $inbox)
 929         {
 930                 $owner = User::getOwnerDataById($uid);
 931                 $profile = APContact::getByURL($owner['url']);
 932
 933                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 934                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 935                         'type' => 'Update',
 936                         'actor' => $owner['url'],
 937                         'object' => self::getProfile($uid),
 938                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 939                         'to' => [$profile['followers']],
 940                         'cc' => []];
 941
 942                 $signed = LDSignature::sign($data, $owner);
 943
 944                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 945                 HTTPSignature::transmit($signed, $inbox, $uid);
 946         }
 947
 948         /**
 949          * Transmits a given activity to a target
 950          *
 951          * @param array $activity
 952          * @param string $target Target profile
 953          * @param integer $uid User ID
 954          */
 955         public static function sendActivity($activity, $target, $uid)
 956         {
 957                 $profile = APContact::getByURL($target);
 958
 959                 $owner = User::getOwnerDataById($uid);
 960
 961                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 962                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 963                         'type' => $activity,
 964                         'actor' => $owner['url'],
 965                         'object' => $profile['url'],
 966                         'to' => $profile['url']];
 967
 968                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 969
 970                 $signed = LDSignature::sign($data, $owner);
 971                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 972         }
 973
 974         /**
 975          * Transmit a message that the contact request had been accepted
 976          *
 977          * @param string $target Target profile
 978          * @param $id
 979          * @param integer $uid User ID
 980          */
 981         public static function sendContactAccept($target, $id, $uid)
 982         {
 983                 $profile = APContact::getByURL($target);
 984
 985                 $owner = User::getOwnerDataById($uid);
 986                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 987                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 988                         'type' => 'Accept',
 989                         'actor' => $owner['url'],
 990                         'object' => ['id' => $id, 'type' => 'Follow',
 991                                 'actor' => $profile['url'],
 992                                 'object' => $owner['url']],
 993                         'to' => $profile['url']];
 994
 995                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 996
 997                 $signed = LDSignature::sign($data, $owner);
 998                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 999         }
1000
1001         /**
1002          * Reject a contact request or terminates the contact relation
1003          *
1004          * @param string $target Target profile
1005          * @param $id
1006          * @param integer $uid User ID
1007          */
1008         public static function sendContactReject($target, $id, $uid)
1009         {
1010                 $profile = APContact::getByURL($target);
1011
1012                 $owner = User::getOwnerDataById($uid);
1013                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1014                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1015                         'type' => 'Reject',
1016                         'actor' => $owner['url'],
1017                         'object' => ['id' => $id, 'type' => 'Follow',
1018                                 'actor' => $profile['url'],
1019                                 'object' => $owner['url']],
1020                         'to' => $profile['url']];
1021
1022                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1023
1024                 $signed = LDSignature::sign($data, $owner);
1025                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1026         }
1027
1028         /**
1029          * Transmits a message that we don't want to follow this contact anymore
1030          *
1031          * @param string $target Target profile
1032          * @param integer $uid User ID
1033          */
1034         public static function sendContactUndo($target, $uid)
1035         {
1036                 $profile = APContact::getByURL($target);
1037
1038                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1039
1040                 $owner = User::getOwnerDataById($uid);
1041                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
1042                         'id' => $id,
1043                         'type' => 'Undo',
1044                         'actor' => $owner['url'],
1045                         'object' => ['id' => $id, 'type' => 'Follow',
1046                                 'actor' => $owner['url'],
1047                                 'object' => $profile['url']],
1048                         'to' => $profile['url']];
1049
1050                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
1051
1052                 $signed = LDSignature::sign($data, $owner);
1053                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1054         }
1055 }