src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\Database\DBA;
   8 use Friendica\Core\System;
   9 use Friendica\Util\HTTPSignature;
  10 use Friendica\Core\Protocol;
  11 use Friendica\Model\Conversation;
  12 use Friendica\Model\Contact;
  13 use Friendica\Model\APContact;
  14 use Friendica\Model\Item;
  15 use Friendica\Model\Term;
  16 use Friendica\Model\User;
  17 use Friendica\Util\DateTimeFormat;
  18 use Friendica\Content\Text\BBCode;
  19 use Friendica\Util\JsonLD;
  20 use Friendica\Util\LDSignature;
  21 use Friendica\Model\Profile;
  22 use Friendica\Core\Config;
  23 use Friendica\Object\Image;
  24 use Friendica\Protocol\ActivityPub;
  25
  26 /**
  27  * @brief ActivityPub Transmitter Protocol class
  28  *
  29  * To-Do:
  30  *
  31  * Missing object types:
  32  * - Event
  33  *
  34  * Complicated object types:
  35  * - Announce
  36  * - Undo Announce
  37  *
  38  * General:
  39  * - Queueing unsucessful deliveries
  40  */
  41 class Transmitter
  42 {
  43         /**
  44          * @brief collects the lost of followers of the given owner
  45          *
  46          * @param array $owner Owner array
  47          * @param integer $page Page number
  48          *
  49          * @return array of owners
  50          */
  51         public static function getFollowers($owner, $page = null)
  52         {
  53                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  54                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  55                 $count = DBA::count('contact', $condition);
  56
  57                 $data = ['@context' => ActivityPub::CONTEXT];
  58                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  59                 $data['type'] = 'OrderedCollection';
  60                 $data['totalItems'] = $count;
  61
  62                 // When we hide our friends we will only show the pure number but don't allow more.
  63                 $profile = Profile::getByUID($owner['uid']);
  64                 if (!empty($profile['hide-friends'])) {
  65                         return $data;
  66                 }
  67
  68                 if (empty($page)) {
  69                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  70                 } else {
  71                         $list = [];
  72
  73                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  74                         while ($contact = DBA::fetch($contacts)) {
  75                                 $list[] = $contact['url'];
  76                         }
  77
  78                         if (!empty($list)) {
  79                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  80                         }
  81
  82                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  83
  84                         $data['orderedItems'] = $list;
  85                 }
  86
  87                 return $data;
  88         }
  89
  90         /**
  91          * @brief Create list of following contacts
  92          *
  93          * @param array $owner Owner array
  94          * @param integer $page Page numbe
  95          *
  96          * @return array of following contacts
  97          */
  98         public static function getFollowing($owner, $page = null)
  99         {
 100                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 101                         'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 102                 $count = DBA::count('contact', $condition);
 103
 104                 $data = ['@context' => ActivityPub::CONTEXT];
 105                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 106                 $data['type'] = 'OrderedCollection';
 107                 $data['totalItems'] = $count;
 108
 109                 // When we hide our friends we will only show the pure number but don't allow more.
 110                 $profile = Profile::getByUID($owner['uid']);
 111                 if (!empty($profile['hide-friends'])) {
 112                         return $data;
 113                 }
 114
 115                 if (empty($page)) {
 116                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 117                 } else {
 118                         $list = [];
 119
 120                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 121                         while ($contact = DBA::fetch($contacts)) {
 122                                 $list[] = $contact['url'];
 123                         }
 124
 125                         if (!empty($list)) {
 126                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 127                         }
 128
 129                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 130
 131                         $data['orderedItems'] = $list;
 132                 }
 133
 134                 return $data;
 135         }
 136
 137         /**
 138          * @brief Public posts for the given owner
 139          *
 140          * @param array $owner Owner array
 141          * @param integer $page Page numbe
 142          *
 143          * @return array of posts
 144          */
 145         public static function getOutbox($owner, $page = null)
 146         {
 147                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 148
 149                 $condition = ['uid' => $owner['uid'], 'contact-id' => $owner['id'], 'author-id' => $public_contact,
 150                         'wall' => true, 'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 151                         'deleted' => false, 'visible' => true];
 152                 $count = DBA::count('item', $condition);
 153
 154                 $data = ['@context' => ActivityPub::CONTEXT];
 155                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 156                 $data['type'] = 'OrderedCollection';
 157                 $data['totalItems'] = $count;
 158
 159                 if (empty($page)) {
 160                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 161                 } else {
 162                         $list = [];
 163
 164                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 165
 166                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 167                         while ($item = Item::fetch($items)) {
 168                                 $object = self::createObjectFromItemID($item['id']);
 169                                 unset($object['@context']);
 170                                 $list[] = $object;
 171                         }
 172
 173                         if (!empty($list)) {
 174                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 175                         }
 176
 177                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 178
 179                         $data['orderedItems'] = $list;
 180                 }
 181
 182                 return $data;
 183         }
 184
 185         /**
 186          * Return the ActivityPub profile of the given user
 187          *
 188          * @param integer $uid User ID
 189          * @return array with profile data
 190          */
 191         public static function getProfile($uid)
 192         {
 193                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 194                         'account_removed' => false, 'verified' => true];
 195                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 196                 $user = DBA::selectFirst('user', $fields, $condition);
 197                 if (!DBA::isResult($user)) {
 198                         return [];
 199                 }
 200
 201                 $fields = ['locality', 'region', 'country-name'];
 202                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 203                 if (!DBA::isResult($profile)) {
 204                         return [];
 205                 }
 206
 207                 $fields = ['name', 'url', 'location', 'about', 'avatar'];
 208                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 209                 if (!DBA::isResult($contact)) {
 210                         return [];
 211                 }
 212
 213                 $data = ['@context' => ActivityPub::CONTEXT];
 214                 $data['id'] = $contact['url'];
 215                 $data['diaspora:guid'] = $user['guid'];
 216                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 217                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 218                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 219                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 220                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 221                 $data['preferredUsername'] = $user['nickname'];
 222                 $data['name'] = $contact['name'];
 223                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 224                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 225                 $data['summary'] = $contact['about'];
 226                 $data['url'] = $contact['url'];
 227                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
 228                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 229                         'owner' => $contact['url'],
 230                         'publicKeyPem' => $user['pubkey']];
 231                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 232                 $data['icon'] = ['type' => 'Image',
 233                         'url' => $contact['avatar']];
 234
 235                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 236                 return $data;
 237         }
 238
 239         /**
 240          * @brief Returns an array with permissions of a given item array
 241          *
 242          * @param array $item
 243          *
 244          * @return array with permissions
 245          */
 246         private static function fetchPermissionBlockFromConversation($item)
 247         {
 248                 if (empty($item['thr-parent'])) {
 249                         return [];
 250                 }
 251
 252                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 253                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 254                 if (!DBA::isResult($conversation)) {
 255                         return [];
 256                 }
 257
 258                 $activity = json_decode($conversation['source'], true);
 259
 260                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 261                 $profile = APContact::getByURL($actor);
 262
 263                 $item_profile = APContact::getByURL($item['author-link']);
 264                 $exclude[] = $item['author-link'];
 265
 266                 if ($item['gravity'] == GRAVITY_PARENT) {
 267                         $exclude[] = $item['owner-link'];
 268                 }
 269
 270                 $permissions['to'][] = $actor;
 271
 272                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 273                         if (empty($activity[$element])) {
 274                                 continue;
 275                         }
 276                         if (is_string($activity[$element])) {
 277                                 $activity[$element] = [$activity[$element]];
 278                         }
 279
 280                         foreach ($activity[$element] as $receiver) {
 281                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 282                                         $receiver = $item_profile['followers'];
 283                                 }
 284                                 if (!in_array($receiver, $exclude)) {
 285                                         $permissions[$element][] = $receiver;
 286                                 }
 287                         }
 288                 }
 289                 return $permissions;
 290         }
 291
 292         /**
 293          * @brief Creates an array of permissions from an item thread
 294          *
 295          * @param array $item
 296          *
 297          * @return array with permission data
 298          */
 299         private static function createPermissionBlockForItem($item)
 300         {
 301                 $data = ['to' => [], 'cc' => []];
 302
 303                 $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 304
 305                 $actor_profile = APContact::getByURL($item['author-link']);
 306
 307                 $terms = Term::tagArrayFromItemId($item['id'], TERM_MENTION);
 308
 309                 $contacts[$item['author-link']] = $item['author-link'];
 310
 311                 if (!$item['private']) {
 312                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 313                         if (!empty($actor_profile['followers'])) {
 314                                 $data['cc'][] = $actor_profile['followers'];
 315                         }
 316
 317                         foreach ($terms as $term) {
 318                                 $profile = APContact::getByURL($term['url'], false);
 319                                 if (!empty($profile) && empty($contacts[$profile['url']])) {
 320                                         $data['cc'][] = $profile['url'];
 321                                         $contacts[$profile['url']] = $profile['url'];
 322                                 }
 323                         }
 324                 } else {
 325                         $receiver_list = Item::enumeratePermissions($item);
 326
 327                         $mentioned = [];
 328
 329                         foreach ($terms as $term) {
 330                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 331                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 332                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
 333                                         $data['to'][] = $contact['url'];
 334                                         $contacts[$contact['url']] = $contact['url'];
 335                                 }
 336                         }
 337
 338                         foreach ($receiver_list as $receiver) {
 339                                 $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
 340                                 if (empty($contacts[$contact['url']])) {
 341                                         $data['cc'][] = $contact['url'];
 342                                         $contacts[$contact['url']] = $contact['url'];
 343                                 }
 344                         }
 345                 }
 346
 347                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
 348                 while ($parent = Item::fetch($parents)) {
 349                         // Don't include data from future posts
 350                         if ($parent['id'] >= $item['id']) {
 351                                 continue;
 352                         }
 353
 354                         $profile = APContact::getByURL($parent['author-link'], false);
 355                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 356                                 $data['cc'][] = $profile['url'];
 357                                 $contacts[$profile['url']] = $profile['url'];
 358                         }
 359
 360                         if ($item['gravity'] != GRAVITY_PARENT) {
 361                                 continue;
 362                         }
 363
 364                         $profile = APContact::getByURL($parent['owner-link'], false);
 365                         if (!empty($profile) && empty($contacts[$profile['url']])) {
 366                                 $data['cc'][] = $profile['url'];
 367                                 $contacts[$profile['url']] = $profile['url'];
 368                         }
 369                 }
 370                 DBA::close($parents);
 371
 372                 if (empty($data['to'])) {
 373                         $data['to'] = $data['cc'];
 374                         $data['cc'] = [];
 375                 }
 376
 377                 return $data;
 378         }
 379
 380         /**
 381          * @brief Fetches a list of inboxes of followers of a given user
 382          *
 383          * @param integer $uid User ID
 384          *
 385          * @return array of follower inboxes
 386          */
 387         public static function fetchTargetInboxesforUser($uid)
 388         {
 389                 $inboxes = [];
 390
 391                 $condition = ['uid' => $uid, 'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
 392
 393                 if (!empty($uid)) {
 394                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 395                 }
 396
 397                 $contacts = DBA::select('contact', ['notify', 'batch'], $condition);
 398                 while ($contact = DBA::fetch($contacts)) {
 399                         $contact = defaults($contact, 'batch', $contact['notify']);
 400                         $inboxes[$contact] = $contact;
 401                 }
 402                 DBA::close($contacts);
 403
 404                 return $inboxes;
 405         }
 406
 407         /**
 408          * @brief Fetches an array of inboxes for the given item and user
 409          *
 410          * @param array $item
 411          * @param integer $uid User ID
 412          *
 413          * @return array with inboxes
 414          */
 415         public static function fetchTargetInboxes($item, $uid)
 416         {
 417                 $permissions = self::createPermissionBlockForItem($item);
 418                 if (empty($permissions)) {
 419                         return [];
 420                 }
 421
 422                 $inboxes = [];
 423
 424                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 425                         $item_profile = APContact::getByURL($item['author-link']);
 426                 } else {
 427                         $item_profile = APContact::getByURL($item['owner-link']);
 428                 }
 429
 430                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 431                         if (empty($permissions[$element])) {
 432                                 continue;
 433                         }
 434
 435                         foreach ($permissions[$element] as $receiver) {
 436                                 if ($receiver == $item_profile['followers']) {
 437                                         $inboxes = self::fetchTargetInboxesforUser($uid);
 438                                 } else {
 439                                         $profile = APContact::getByURL($receiver);
 440                                         if (!empty($profile)) {
 441                                                 $target = defaults($profile, 'sharedinbox', $profile['inbox']);
 442                                                 $inboxes[$target] = $target;
 443                                         }
 444                                 }
 445                         }
 446                 }
 447
 448                 return $inboxes;
 449         }
 450
 451         /**
 452          * @brief Returns the activity type of a given item
 453          *
 454          * @param array $item
 455          *
 456          * @return string with activity type
 457          */
 458         private static function getTypeOfItem($item)
 459         {
 460                 if ($item['verb'] == ACTIVITY_POST) {
 461                         if ($item['created'] == $item['edited']) {
 462                                 $type = 'Create';
 463                         } else {
 464                                 $type = 'Update';
 465                         }
 466                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 467                         $type = 'Like';
 468                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 469                         $type = 'Dislike';
 470                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 471                         $type = 'Accept';
 472                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 473                         $type = 'Reject';
 474                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 475                         $type = 'TentativeAccept';
 476                 } else {
 477                         $type = '';
 478                 }
 479
 480                 return $type;
 481         }
 482
 483         /**
 484          * @brief Creates an activity array for a given item id
 485          *
 486          * @param integer $item_id
 487          * @param boolean $object_mode Is the activity item is used inside another object?
 488          *
 489          * @return array of activity
 490          */
 491         public static function createActivityFromItem($item_id, $object_mode = false)
 492         {
 493                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 494
 495                 if (!DBA::isResult($item)) {
 496                         return false;
 497                 }
 498
 499                 $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 500                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 501                 if (DBA::isResult($conversation)) {
 502                         $data = json_decode($conversation['source']);
 503                         if (!empty($data)) {
 504                                 return $data;
 505                         }
 506                 }
 507
 508                 $type = self::getTypeOfItem($item);
 509
 510                 if (!$object_mode) {
 511                         $data = ['@context' => ActivityPub::CONTEXT];
 512
 513                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 514                                 $type = 'Undo';
 515                         } elseif ($item['deleted']) {
 516                                 $type = 'Delete';
 517                         }
 518                 } else {
 519                         $data = [];
 520                 }
 521
 522                 $data['id'] = $item['uri'] . '#' . $type;
 523                 $data['type'] = $type;
 524                 $data['actor'] = $item['owner-link'];
 525
 526                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 527
 528                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 529
 530                 if (in_array($data['type'], ['Create', 'Update', 'Announce', 'Delete'])) {
 531                         $data['object'] = self::createNote($item);
 532                 } elseif ($data['type'] == 'Undo') {
 533                         $data['object'] = self::createActivityFromItem($item_id, true);
 534                 } else {
 535                         $data['object'] = $item['thr-parent'];
 536                 }
 537
 538                 $owner = User::getOwnerDataById($item['uid']);
 539
 540                 if (!$object_mode) {
 541                         return LDSignature::sign($data, $owner);
 542                 } else {
 543                         return $data;
 544                 }
 545
 546                 /// @todo Create "conversation" entry
 547         }
 548
 549         /**
 550          * @brief Creates an object array for a given item id
 551          *
 552          * @param integer $item_id
 553          *
 554          * @return array with the object data
 555          */
 556         public static function createObjectFromItemID($item_id)
 557         {
 558                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 559
 560                 if (!DBA::isResult($item)) {
 561                         return false;
 562                 }
 563
 564                 $data = ['@context' => ActivityPub::CONTEXT];
 565                 $data = array_merge($data, self::createNote($item));
 566
 567                 return $data;
 568         }
 569
 570         /**
 571          * @brief Returns a tag array for a given item array
 572          *
 573          * @param array $item
 574          *
 575          * @return array of tags
 576          */
 577         private static function createTagList($item)
 578         {
 579                 $tags = [];
 580
 581                 $terms = Term::tagArrayFromItemId($item['id']);
 582                 foreach ($terms as $term) {
 583                         if ($term['type'] == TERM_HASHTAG) {
 584                                 $tags[] = ['type' => 'Hashtag', 'href' => $term['url'], 'name' => '#' . $term['term']];
 585                         } elseif ($term['type'] == TERM_MENTION) {
 586                                 $contact = Contact::getDetailsByURL($term['url']);
 587                                 if (!empty($contact['addr'])) {
 588                                         $mention = '@' . $contact['addr'];
 589                                 } else {
 590                                         $mention = '@' . $term['url'];
 591                                 }
 592
 593                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 594                         }
 595                 }
 596                 return $tags;
 597         }
 598
 599         /**
 600          * @brief Adds attachment data to the JSON document
 601          *
 602          * @param array $item Data of the item that is to be posted
 603          * @param text $type Object type
 604          *
 605          * @return array with attachment data
 606          */
 607         private static function createAttachmentList($item, $type)
 608         {
 609                 $attachments = [];
 610
 611                 $arr = explode('[/attach],', $item['attach']);
 612                 if (count($arr)) {
 613                         foreach ($arr as $r) {
 614                                 $matches = false;
 615                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 616                                 if ($cnt) {
 617                                         $attributes = ['type' => 'Document',
 618                                                         'mediaType' => $matches[3],
 619                                                         'url' => $matches[1],
 620                                                         'name' => null];
 621
 622                                         if (trim($matches[4]) != '') {
 623                                                 $attributes['name'] = trim($matches[4]);
 624                                         }
 625
 626                                         $attachments[] = $attributes;
 627                                 }
 628                         }
 629                 }
 630
 631                 if ($type != 'Note') {
 632                         return $attachments;
 633                 }
 634
 635                 // Simplify image codes
 636                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 637
 638                 // Grab all pictures and create attachments out of them
 639                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 640                         foreach ($pictures[1] as $picture) {
 641                                 $imgdata = Image::getInfoFromURL($picture);
 642                                 if ($imgdata) {
 643                                         $attachments[] = ['type' => 'Document',
 644                                                 'mediaType' => $imgdata['mime'],
 645                                                 'url' => $picture,
 646                                                 'name' => null];
 647                                 }
 648                         }
 649                 }
 650
 651                 return $attachments;
 652         }
 653
 654         /**
 655          * @brief Remove image elements and replaces them with links to the image
 656          *
 657          * @param string $body
 658          *
 659          * @return string with replaced elements
 660          */
 661         private static function removePictures($body)
 662         {
 663                 // Simplify image codes
 664                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 665
 666                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 667                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 668
 669                 return $body;
 670         }
 671
 672         /**
 673          * @brief Fetches the "context" value for a givem item array from the "conversation" table
 674          *
 675          * @param array $item
 676          *
 677          * @return string with context url
 678          */
 679         private static function fetchContextURLForItem($item)
 680         {
 681                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 682                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 683                         $context_uri = $conversation['conversation-href'];
 684                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 685                         $context_uri = $conversation['conversation-uri'];
 686                 } else {
 687                         $context_uri = $item['parent-uri'] . '#context';
 688                 }
 689                 return $context_uri;
 690         }
 691
 692         /**
 693          * @brief Returns if the post contains sensitive content ("nsfw")
 694          *
 695          * @param integer $item_id
 696          *
 697          * @return boolean
 698          */
 699         private static function isSensitive($item_id)
 700         {
 701                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 702                 return DBA::exists('term', $condition);
 703         }
 704
 705         /**
 706          * @brief Creates a note/article object array
 707          *
 708          * @param array $item
 709          *
 710          * @return array with the object data
 711          */
 712         public static function createNote($item)
 713         {
 714                 if (!empty($item['title'])) {
 715                         $type = 'Article';
 716                 } else {
 717                         $type = 'Note';
 718                 }
 719
 720                 if ($item['deleted']) {
 721                         $type = 'Tombstone';
 722                 }
 723
 724                 $data = [];
 725                 $data['id'] = $item['uri'];
 726                 $data['type'] = $type;
 727
 728                 if ($item['deleted']) {
 729                         return $data;
 730                 }
 731
 732                 $data['summary'] = null; // Ignore by now
 733
 734                 if ($item['uri'] != $item['thr-parent']) {
 735                         $data['inReplyTo'] = $item['thr-parent'];
 736                 } else {
 737                         $data['inReplyTo'] = null;
 738                 }
 739
 740                 $data['diaspora:guid'] = $item['guid'];
 741                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 742
 743                 if ($item['created'] != $item['edited']) {
 744                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
 745                 }
 746
 747                 $data['url'] = $item['plink'];
 748                 $data['attributedTo'] = $item['author-link'];
 749                 $data['actor'] = $item['author-link'];
 750                 $data['sensitive'] = self::isSensitive($item['id']);
 751                 $data['context'] = self::fetchContextURLForItem($item);
 752
 753                 if (!empty($item['title'])) {
 754                         $data['name'] = BBCode::convert($item['title'], false, 7);
 755                 }
 756
 757                 $body = $item['body'];
 758
 759                 if ($type == 'Note') {
 760                         $body = self::removePictures($body);
 761                 }
 762
 763                 $data['content'] = BBCode::convert($body, false, 7);
 764                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
 765
 766                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
 767                         $data['diaspora:comment'] = $item['signed_text'];
 768                 }
 769
 770                 $data['attachment'] = self::createAttachmentList($item, $type);
 771                 $data['tag'] = self::createTagList($item);
 772                 $data = array_merge($data, self::createPermissionBlockForItem($item));
 773
 774                 return $data;
 775         }
 776
 777         /**
 778          * @brief Transmits a profile deletion to a given inbox
 779          *
 780          * @param integer $uid User ID
 781          * @param string $inbox Target inbox
 782          */
 783         public static function sendProfileDeletion($uid, $inbox)
 784         {
 785                 $owner = User::getOwnerDataById($uid);
 786                 $profile = APContact::getByURL($owner['url']);
 787
 788                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 789                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 790                         'type' => 'Delete',
 791                         'actor' => $owner['url'],
 792                         'object' => $owner['url'],
 793                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 794                         'to' => [ActivityPub::PUBLIC_COLLECTION],
 795                         'cc' => []];
 796
 797                 $signed = LDSignature::sign($data, $owner);
 798
 799                 logger('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 800                 HTTPSignature::transmit($signed, $inbox, $uid);
 801         }
 802
 803         /**
 804          * @brief Transmits a profile change to a given inbox
 805          *
 806          * @param integer $uid User ID
 807          * @param string $inbox Target inbox
 808          */
 809         public static function sendProfileUpdate($uid, $inbox)
 810         {
 811                 $owner = User::getOwnerDataById($uid);
 812                 $profile = APContact::getByURL($owner['url']);
 813
 814                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 815                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 816                         'type' => 'Update',
 817                         'actor' => $owner['url'],
 818                         'object' => self::getProfile($uid),
 819                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 820                         'to' => [$profile['followers']],
 821                         'cc' => []];
 822
 823                 $signed = LDSignature::sign($data, $owner);
 824
 825                 logger('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', LOGGER_DEBUG);
 826                 HTTPSignature::transmit($signed, $inbox, $uid);
 827         }
 828
 829         /**
 830          * @brief Transmits a given activity to a target
 831          *
 832          * @param array $activity
 833          * @param string $target Target profile
 834          * @param integer $uid User ID
 835          */
 836         public static function sendActivity($activity, $target, $uid)
 837         {
 838                 $profile = APContact::getByURL($target);
 839
 840                 $owner = User::getOwnerDataById($uid);
 841
 842                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 843                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 844                         'type' => $activity,
 845                         'actor' => $owner['url'],
 846                         'object' => $profile['url'],
 847                         'to' => $profile['url']];
 848
 849                 logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
 850
 851                 $signed = LDSignature::sign($data, $owner);
 852                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 853         }
 854
 855         /**
 856          * @brief Transmit a message that the contact request had been accepted
 857          *
 858          * @param string $target Target profile
 859          * @param $id
 860          * @param integer $uid User ID
 861          */
 862         public static function sendContactAccept($target, $id, $uid)
 863         {
 864                 $profile = APContact::getByURL($target);
 865
 866                 $owner = User::getOwnerDataById($uid);
 867                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 868                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 869                         'type' => 'Accept',
 870                         'actor' => $owner['url'],
 871                         'object' => ['id' => $id, 'type' => 'Follow',
 872                                 'actor' => $profile['url'],
 873                                 'object' => $owner['url']],
 874                         'to' => $profile['url']];
 875
 876                 logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 877
 878                 $signed = LDSignature::sign($data, $owner);
 879                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 880         }
 881
 882         /**
 883          * @brief Reject a contact request or terminates the contact relation
 884          *
 885          * @param string $target Target profile
 886          * @param $id
 887          * @param integer $uid User ID
 888          */
 889         public static function sendContactReject($target, $id, $uid)
 890         {
 891                 $profile = APContact::getByURL($target);
 892
 893                 $owner = User::getOwnerDataById($uid);
 894                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 895                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
 896                         'type' => 'Reject',
 897                         'actor' => $owner['url'],
 898                         'object' => ['id' => $id, 'type' => 'Follow',
 899                                 'actor' => $profile['url'],
 900                                 'object' => $owner['url']],
 901                         'to' => $profile['url']];
 902
 903                 logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 904
 905                 $signed = LDSignature::sign($data, $owner);
 906                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 907         }
 908
 909         /**
 910          * @brief Transmits a message that we don't want to follow this contact anymore
 911          *
 912          * @param string $target Target profile
 913          * @param integer $uid User ID
 914          */
 915         public static function sendContactUndo($target, $uid)
 916         {
 917                 $profile = APContact::getByURL($target);
 918
 919                 $id = System::baseUrl() . '/activity/' . System::createGUID();
 920
 921                 $owner = User::getOwnerDataById($uid);
 922                 $data = ['@context' => 'https://www.w3.org/ns/activitystreams',
 923                         'id' => $id,
 924                         'type' => 'Undo',
 925                         'actor' => $owner['url'],
 926                         'object' => ['id' => $id, 'type' => 'Follow',
 927                                 'actor' => $owner['url'],
 928                                 'object' => $profile['url']],
 929                         'to' => $profile['url']];
 930
 931                 logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
 932
 933                 $signed = LDSignature::sign($data, $owner);
 934                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
 935         }
 936 }