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