src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Content\Feature;
   9 use Friendica\Database\DBA;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\Logger;
  12 use Friendica\Core\System;
  13 use Friendica\Util\HTTPSignature;
  14 use Friendica\Core\Protocol;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Contact;
  17 use Friendica\Model\APContact;
  18 use Friendica\Model\Item;
  19 use Friendica\Model\Term;
  20 use Friendica\Model\User;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\Plaintext;
  24 use Friendica\Util\XML;
  25 use Friendica\Util\JsonLD;
  26 use Friendica\Util\LDSignature;
  27 use Friendica\Model\Profile;
  28 use Friendica\Object\Image;
  29 use Friendica\Protocol\ActivityPub;
  30 use Friendica\Core\Cache;
  31 use Friendica\Util\Map;
  32 use Friendica\Util\Network;
  33
  34 require_once 'include/api.php';
  35 require_once 'mod/share.php';
  36
  37 /**
  38  * @brief ActivityPub Transmitter Protocol class
  39  *
  40  * To-Do:
  41  * - Undo Announce
  42  */
  43 class Transmitter
  44 {
  45         /**
  46          * collects the lost of followers of the given owner
  47          *
  48          * @param array   $owner Owner array
  49          * @param integer $page  Page number
  50          *
  51          * @return array of owners
  52          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  53          */
  54         public static function getFollowers($owner, $page = null)
  55         {
  56                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  57                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  58                 $count = DBA::count('contact', $condition);
  59
  60                 $data = ['@context' => ActivityPub::CONTEXT];
  61                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  62                 $data['type'] = 'OrderedCollection';
  63                 $data['totalItems'] = $count;
  64
  65                 // When we hide our friends we will only show the pure number but don't allow more.
  66                 $profile = Profile::getByUID($owner['uid']);
  67                 if (!empty($profile['hide-friends'])) {
  68                         return $data;
  69                 }
  70
  71                 if (empty($page)) {
  72                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  73                 } else {
  74                         $data['type'] = 'OrderedCollectionPage';
  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 $page  Page numbe
  99          *
 100          * @return array of following contacts
 101          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 102          */
 103         public static function getFollowing($owner, $page = null)
 104         {
 105                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 106                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 107                 $count = DBA::count('contact', $condition);
 108
 109                 $data = ['@context' => ActivityPub::CONTEXT];
 110                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 111                 $data['type'] = 'OrderedCollection';
 112                 $data['totalItems'] = $count;
 113
 114                 // When we hide our friends we will only show the pure number but don't allow more.
 115                 $profile = Profile::getByUID($owner['uid']);
 116                 if (!empty($profile['hide-friends'])) {
 117                         return $data;
 118                 }
 119
 120                 if (empty($page)) {
 121                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 122                 } else {
 123                         $data['type'] = 'OrderedCollectionPage';
 124                         $list = [];
 125
 126                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 127                         while ($contact = DBA::fetch($contacts)) {
 128                                 $list[] = $contact['url'];
 129                         }
 130
 131                         if (!empty($list)) {
 132                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 133                         }
 134
 135                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 136
 137                         $data['orderedItems'] = $list;
 138                 }
 139
 140                 return $data;
 141         }
 142
 143         /**
 144          * Public posts for the given owner
 145          *
 146          * @param array   $owner Owner array
 147          * @param integer $page  Page numbe
 148          *
 149          * @return array of posts
 150          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 151          * @throws \ImagickException
 152          */
 153         public static function getOutbox($owner, $page = null)
 154         {
 155                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 156
 157                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 158                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 159                         'deleted' => false, 'visible' => true, 'moderated' => false];
 160                 $count = DBA::count('item', $condition);
 161
 162                 $data = ['@context' => ActivityPub::CONTEXT];
 163                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 164                 $data['type'] = 'OrderedCollection';
 165                 $data['totalItems'] = $count;
 166
 167                 if (empty($page)) {
 168                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 169                 } else {
 170                         $data['type'] = 'OrderedCollectionPage';
 171                         $list = [];
 172
 173                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 174
 175                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 176                         while ($item = Item::fetch($items)) {
 177                                 $object = self::createObjectFromItemID($item['id']);
 178                                 unset($object['@context']);
 179                                 $list[] = $object;
 180                         }
 181
 182                         if (!empty($list)) {
 183                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 184                         }
 185
 186                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 187
 188                         $data['orderedItems'] = $list;
 189                 }
 190
 191                 return $data;
 192         }
 193
 194         /**
 195          * Return the service array containing information the used software and it's url
 196          *
 197          * @return array with service data
 198          */
 199         private static function getService()
 200         {
 201                 return ['type' => 'Service',
 202                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 203                         'url' => BaseObject::getApp()->getBaseURL()];
 204         }
 205
 206         /**
 207          * Return the ActivityPub profile of the given user
 208          *
 209          * @param integer $uid User ID
 210          * @return array with profile data
 211          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 212          */
 213         public static function getProfile($uid)
 214         {
 215                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 216                         'account_removed' => false, 'verified' => true];
 217                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 218                 $user = DBA::selectFirst('user', $fields, $condition);
 219                 if (!DBA::isResult($user)) {
 220                         return [];
 221                 }
 222
 223                 $fields = ['locality', 'region', 'country-name'];
 224                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 225                 if (!DBA::isResult($profile)) {
 226                         return [];
 227                 }
 228
 229                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 230                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 231                 if (!DBA::isResult($contact)) {
 232                         return [];
 233                 }
 234
 235                 $data = ['@context' => ActivityPub::CONTEXT];
 236                 $data['id'] = $contact['url'];
 237                 $data['diaspora:guid'] = $user['guid'];
 238                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 239                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 240                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 241                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 242                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 243                 $data['preferredUsername'] = $user['nickname'];
 244                 $data['name'] = $contact['name'];
 245                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 246                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 247                 $data['summary'] = $contact['about'];
 248                 $data['url'] = $contact['url'];
 249                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 250                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 251                         'owner' => $contact['url'],
 252                         'publicKeyPem' => $user['pubkey']];
 253                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 254                 $data['icon'] = ['type' => 'Image',
 255                         'url' => $contact['photo']];
 256
 257                 $data['generator'] = self::getService();
 258
 259                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 260                 return $data;
 261         }
 262
 263         /**
 264          * @param string $username
 265          * @return array
 266          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 267          */
 268         public static function getDeletedUser($username)
 269         {
 270                 return [
 271                         '@context' => ActivityPub::CONTEXT,
 272                         'id' => System::baseUrl() . '/profile/' . $username,
 273                         'type' => 'Tombstone',
 274                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 275                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 276                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 277                 ];
 278         }
 279
 280         /**
 281          * Returns an array with permissions of a given item array
 282          *
 283          * @param array $item
 284          *
 285          * @return array with permissions
 286          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 287          * @throws \ImagickException
 288          */
 289         private static function fetchPermissionBlockFromConversation($item)
 290         {
 291                 if (empty($item['thr-parent'])) {
 292                         return [];
 293                 }
 294
 295                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 296                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 297                 if (!DBA::isResult($conversation)) {
 298                         return [];
 299                 }
 300
 301                 $activity = json_decode($conversation['source'], true);
 302
 303                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 304                 $profile = APContact::getByURL($actor);
 305
 306                 $item_profile = APContact::getByURL($item['author-link']);
 307                 $exclude[] = $item['author-link'];
 308
 309                 if ($item['gravity'] == GRAVITY_PARENT) {
 310                         $exclude[] = $item['owner-link'];
 311                 }
 312
 313                 $permissions['to'][] = $actor;
 314
 315                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 316                         if (empty($activity[$element])) {
 317                                 continue;
 318                         }
 319                         if (is_string($activity[$element])) {
 320                                 $activity[$element] = [$activity[$element]];
 321                         }
 322
 323                         foreach ($activity[$element] as $receiver) {
 324                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 325                                         $permissions[$element][] = $item_profile['followers'];
 326                                 } elseif (!in_array($receiver, $exclude)) {
 327                                         $permissions[$element][] = $receiver;
 328                                 }
 329                         }
 330                 }
 331                 return $permissions;
 332         }
 333
 334         /**
 335          * Creates an array of permissions from an item thread
 336          *
 337          * @param array   $item       Item array
 338          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 339          * @param integer $last_id    Last item id for adding receivers
 340          * @param boolean $forum_mode "true" means that we are sending content to a forum
 341          *
 342          * @return array with permission data
 343          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 344          * @throws \ImagickException
 345          */
 346         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 347         {
 348                 if ($last_id == 0) {
 349                         $last_id = $item['id'];
 350                 }
 351
 352                 $always_bcc = false;
 353
 354                 // Check if we should always deliver our stuff via BCC
 355                 if (!empty($item['uid'])) {
 356                         $profile = Profile::getByUID($item['uid']);
 357                         if (!empty($profile)) {
 358                                 $always_bcc = $profile['hide-friends'];
 359                         }
 360                 }
 361
 362                 if (Config::get('debug', 'total_ap_delivery')) {
 363                         // Will be activated in a later step
 364                         $networks = Protocol::FEDERATED;
 365                 } else {
 366                         // For now only send to these contacts:
 367                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 368                 }
 369
 370                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 371
 372                 if ($item['gravity'] == GRAVITY_PARENT) {
 373                         $actor_profile = APContact::getByURL($item['owner-link']);
 374                 } else {
 375                         $actor_profile = APContact::getByURL($item['author-link']);
 376                 }
 377
 378                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 379
 380                 if (!$item['private']) {
 381                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 382
 383                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 384
 385                         foreach ($terms as $term) {
 386                                 $profile = APContact::getByURL($term['url'], false);
 387                                 if (!empty($profile)) {
 388                                         $data['to'][] = $profile['url'];
 389                                 }
 390                         }
 391                 } else {
 392                         $receiver_list = Item::enumeratePermissions($item, true);
 393
 394                         foreach ($terms as $term) {
 395                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 396                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 397                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 398                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 399                                                 continue;
 400                                         }
 401
 402                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 403                                                 $data['to'][] = $profile['url'];
 404                                         }
 405                                 }
 406                         }
 407
 408                         foreach ($receiver_list as $receiver) {
 409                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 410                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 411                                         continue;
 412                                 }
 413
 414                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 415                                         if ($contact['hidden'] || $always_bcc) {
 416                                                 $data['bcc'][] = $profile['url'];
 417                                         } else {
 418                                                 $data['cc'][] = $profile['url'];
 419                                         }
 420                                 }
 421                         }
 422                 }
 423
 424                 if (!empty($item['parent'])) {
 425                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 426                         while ($parent = Item::fetch($parents)) {
 427                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 428                                         $profile = APContact::getByURL($parent['owner-link'], false);
 429                                         if (!empty($profile)) {
 430                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 431                                                         // Comments to forums are directed to the forum
 432                                                         // But comments to forums aren't directed to the followers collection
 433                                                         if ($profile['type'] == 'Group') {
 434                                                                 $data['to'][] = $profile['url'];
 435                                                         } else {
 436                                                                 $data['cc'][] = $profile['url'];
 437                                                                 if (!$item['private'] && !empty($actor_profile['followers'])) {
 438                                                                         $data['cc'][] = $actor_profile['followers'];
 439                                                                 }
 440                                                         }
 441                                                 } else {
 442                                                         // Public thread parent post always are directed to the followers
 443                                                         if (!$item['private'] && !$forum_mode) {
 444                                                                 $data['cc'][] = $actor_profile['followers'];
 445                                                         }
 446                                                 }
 447                                         }
 448                                 }
 449
 450                                 // Don't include data from future posts
 451                                 if ($parent['id'] >= $last_id) {
 452                                         continue;
 453                                 }
 454
 455                                 $profile = APContact::getByURL($parent['author-link'], false);
 456                                 if (!empty($profile)) {
 457                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 458                                                 $data['to'][] = $profile['url'];
 459                                         } else {
 460                                                 $data['cc'][] = $profile['url'];
 461                                         }
 462                                 }
 463                         }
 464                         DBA::close($parents);
 465                 }
 466
 467                 $data['to'] = array_unique($data['to']);
 468                 $data['cc'] = array_unique($data['cc']);
 469                 $data['bcc'] = array_unique($data['bcc']);
 470
 471                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 472                         unset($data['to'][$key]);
 473                 }
 474
 475                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 476                         unset($data['cc'][$key]);
 477                 }
 478
 479                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 480                         unset($data['bcc'][$key]);
 481                 }
 482
 483                 foreach ($data['to'] as $to) {
 484                         if (($key = array_search($to, $data['cc'])) !== false) {
 485                                 unset($data['cc'][$key]);
 486                         }
 487
 488                         if (($key = array_search($to, $data['bcc'])) !== false) {
 489                                 unset($data['bcc'][$key]);
 490                         }
 491                 }
 492
 493                 foreach ($data['cc'] as $cc) {
 494                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 495                                 unset($data['bcc'][$key]);
 496                         }
 497                 }
 498
 499                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 500
 501                 if (!$blindcopy) {
 502                         unset($receivers['bcc']);
 503                 }
 504
 505                 return $receivers;
 506         }
 507
 508         /**
 509          * Check if an inbox is archived
 510          *
 511          * @param string $url Inbox url
 512          *
 513          * @return boolean "true" if inbox is archived
 514          */
 515         private static function archivedInbox($url)
 516         {
 517                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 518         }
 519
 520         /**
 521          * Fetches a list of inboxes of followers of a given user
 522          *
 523          * @param integer $uid      User ID
 524          * @param boolean $personal fetch personal inboxes
 525          *
 526          * @return array of follower inboxes
 527          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 528          * @throws \ImagickException
 529          */
 530         public static function fetchTargetInboxesforUser($uid, $personal = false)
 531         {
 532                 $inboxes = [];
 533
 534                 if (Config::get('debug', 'total_ap_delivery')) {
 535                         // Will be activated in a later step
 536                         $networks = Protocol::FEDERATED;
 537                 } else {
 538                         // For now only send to these contacts:
 539                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 540                 }
 541
 542                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 543
 544                 if (!empty($uid)) {
 545                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 546                 }
 547
 548                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 549                 while ($contact = DBA::fetch($contacts)) {
 550                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 551                                 continue;
 552                         }
 553
 554                         if (Network::isUrlBlocked($contact['url'])) {
 555                                 continue;
 556                         }
 557
 558                         $profile = APContact::getByURL($contact['url'], false);
 559                         if (!empty($profile)) {
 560                                 if (empty($profile['sharedinbox']) || $personal) {
 561                                         $target = $profile['inbox'];
 562                                 } else {
 563                                         $target = $profile['sharedinbox'];
 564                                 }
 565                                 if (!self::archivedInbox($target)) {
 566                                         $inboxes[$target] = $target;
 567                                 }
 568                         }
 569                 }
 570                 DBA::close($contacts);
 571
 572                 return $inboxes;
 573         }
 574
 575         /**
 576          * Fetches an array of inboxes for the given item and user
 577          *
 578          * @param array   $item       Item array
 579          * @param integer $uid        User ID
 580          * @param boolean $personal   fetch personal inboxes
 581          * @param integer $last_id    Last item id for adding receivers
 582          * @param boolean $forum_mode "true" means that we are sending content to a forum
 583          * @return array with inboxes
 584          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 585          * @throws \ImagickException
 586          */
 587         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 588         {
 589                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 590                 if (empty($permissions)) {
 591                         return [];
 592                 }
 593
 594                 $inboxes = [];
 595
 596                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 597                         $item_profile = APContact::getByURL($item['author-link'], false);
 598                 } else {
 599                         $item_profile = APContact::getByURL($item['owner-link'], false);
 600                 }
 601
 602                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 603                         if (empty($permissions[$element])) {
 604                                 continue;
 605                         }
 606
 607                         $blindcopy = in_array($element, ['bto', 'bcc']);
 608
 609                         foreach ($permissions[$element] as $receiver) {
 610                                 if (Network::isUrlBlocked($receiver)) {
 611                                         continue;
 612                                 }
 613
 614                                 if ($receiver == $item_profile['followers']) {
 615                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 616                                 } else {
 617                                         $profile = APContact::getByURL($receiver, false);
 618                                         if (!empty($profile)) {
 619                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 620                                                         $target = $profile['inbox'];
 621                                                 } else {
 622                                                         $target = $profile['sharedinbox'];
 623                                                 }
 624                                                 if (!self::archivedInbox($target)) {
 625                                                         $inboxes[$target] = $target;
 626                                                 }
 627                                         }
 628                                 }
 629                         }
 630                 }
 631
 632                 return $inboxes;
 633         }
 634
 635         /**
 636          * Creates an array in the structure of the item table for a given mail id
 637          *
 638          * @param integer $mail_id
 639          *
 640          * @return array
 641          * @throws \Exception
 642          */
 643         public static function ItemArrayFromMail($mail_id)
 644         {
 645                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 646
 647                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 648
 649                 // Making the post more compatible for Mastodon by:
 650                 // - Making it a note and not an article (no title)
 651                 // - Moving the title into the "summary" field that is used as a "content warning"
 652                 $mail['body'] = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
 653                 $mail['title'] = '';
 654
 655                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 656                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 657                 $mail['allow_gid'] = '';
 658                 $mail['deny_cid'] = '';
 659                 $mail['deny_gid'] = '';
 660                 $mail['private'] = true;
 661                 $mail['deleted'] = false;
 662                 $mail['edited'] = $mail['created'];
 663                 $mail['plink'] = $mail['uri'];
 664                 $mail['thr-parent'] = $reply['uri'];
 665                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 666
 667                 $mail['event-type'] = '';
 668                 $mail['attach'] = '';
 669
 670                 $mail['parent'] = 0;
 671
 672                 return $mail;
 673         }
 674
 675         /**
 676          * Creates an activity array for a given mail id
 677          *
 678          * @param integer $mail_id
 679          * @param boolean $object_mode Is the activity item is used inside another object?
 680          *
 681          * @return array of activity
 682          * @throws \Exception
 683          */
 684         public static function createActivityFromMail($mail_id, $object_mode = false)
 685         {
 686                 $mail = self::ItemArrayFromMail($mail_id);
 687                 $object = self::createNote($mail);
 688
 689                 $object['to'] = $object['cc'];
 690                 unset($object['cc']);
 691
 692                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => 'test']];
 693
 694                 if (!$object_mode) {
 695                         $data = ['@context' => ActivityPub::CONTEXT];
 696                 } else {
 697                         $data = [];
 698                 }
 699
 700                 $data['id'] = $mail['uri'] . '#Create';
 701                 $data['type'] = 'Create';
 702                 $data['actor'] = $mail['author-link'];
 703                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 704                 $data['instrument'] = self::getService();
 705                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 706
 707                 if (empty($data['to']) && !empty($data['cc'])) {
 708                         $data['to'] = $data['cc'];
 709                 }
 710
 711                 if (empty($data['to']) && !empty($data['bcc'])) {
 712                         $data['to'] = $data['bcc'];
 713                 }
 714
 715                 unset($data['cc']);
 716                 unset($data['bcc']);
 717
 718                 $object['to'] = $data['to'];
 719                 unset($object['cc']);
 720                 unset($object['bcc']);
 721
 722                 $data['directMessage'] = true;
 723
 724                 $data['object'] = $object;
 725
 726                 $owner = User::getOwnerDataById($mail['uid']);
 727
 728                 if (!$object_mode && !empty($owner)) {
 729                         return LDSignature::sign($data, $owner);
 730                 } else {
 731                         return $data;
 732                 }
 733         }
 734
 735         /**
 736          * Returns the activity type of a given item
 737          *
 738          * @param array $item
 739          *
 740          * @return string with activity type
 741          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 742          * @throws \ImagickException
 743          */
 744         private static function getTypeOfItem($item)
 745         {
 746                 $reshared = false;
 747
 748                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 749                 if (strpos($item['body'], "[share") === 0) {
 750                         $announce = api_share_as_retweet($item);
 751                         $reshared = !empty($announce['plink']);
 752                 }
 753
 754                 if ($reshared) {
 755                         $type = 'Announce';
 756                 } elseif ($item['verb'] == ACTIVITY_POST) {
 757                         if ($item['created'] == $item['edited']) {
 758                                 $type = 'Create';
 759                         } else {
 760                                 $type = 'Update';
 761                         }
 762                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 763                         $type = 'Like';
 764                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 765                         $type = 'Dislike';
 766                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 767                         $type = 'Accept';
 768                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 769                         $type = 'Reject';
 770                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 771                         $type = 'TentativeAccept';
 772                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 773                         $type = 'Follow';
 774                 } elseif ($item['verb'] == ACTIVITY_TAG) {
 775                         $type = 'Add';
 776                 } else {
 777                         $type = '';
 778                 }
 779
 780                 return $type;
 781         }
 782
 783         /**
 784          * Creates the activity or fetches it from the cache
 785          *
 786          * @param integer $item_id
 787          * @param boolean $force Force new cache entry
 788          *
 789          * @return array with the activity
 790          * @throws \Exception
 791          */
 792         public static function createCachedActivityFromItem($item_id, $force = false)
 793         {
 794                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 795
 796                 if (!$force) {
 797                         $data = Cache::get($cachekey);
 798                         if (!is_null($data)) {
 799                                 return $data;
 800                         }
 801                 }
 802
 803                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 804
 805                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 806                 return $data;
 807         }
 808
 809         /**
 810          * Creates an activity array for a given item id
 811          *
 812          * @param integer $item_id
 813          * @param boolean $object_mode Is the activity item is used inside another object?
 814          *
 815          * @return array of activity
 816          * @throws \Exception
 817          */
 818         public static function createActivityFromItem($item_id, $object_mode = false)
 819         {
 820                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 821
 822                 if (!DBA::isResult($item)) {
 823                         return false;
 824                 }
 825
 826                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 827                         $owner = User::getOwnerDataById($item['uid']);
 828                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 829                                 $type = 'Announce';
 830
 831                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 832                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 833                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 834                         }
 835                 }
 836
 837                 if (empty($type)) {
 838                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 839                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 840                         if (DBA::isResult($conversation)) {
 841                                 $data = json_decode($conversation['source'], true);
 842                                 if (!empty($data)) {
 843                                         return $data;
 844                                 }
 845                         }
 846
 847                         $type = self::getTypeOfItem($item);
 848                 }
 849
 850                 if (!$object_mode) {
 851                         $data = ['@context' => ActivityPub::CONTEXT];
 852
 853                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 854                                 $type = 'Undo';
 855                         } elseif ($item['deleted']) {
 856                                 $type = 'Delete';
 857                         }
 858                 } else {
 859                         $data = [];
 860                 }
 861
 862                 $data['id'] = $item['uri'] . '#' . $type;
 863                 $data['type'] = $type;
 864
 865                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 866                         $data['actor'] = $item['author-link'];
 867                 } else {
 868                         $data['actor'] = $item['owner-link'];
 869                 }
 870
 871                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 872
 873                 $data['instrument'] = self::getService();
 874
 875                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 876
 877                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 878                         $data['object'] = self::createNote($item);
 879                 } elseif ($data['type'] == 'Add') {
 880                         $data = self::createAddTag($item, $data);
 881                 } elseif ($data['type'] == 'Announce') {
 882                         $data = self::createAnnounce($item, $data);
 883                 } elseif ($data['type'] == 'Follow') {
 884                         $data['object'] = $item['parent-uri'];
 885                 } elseif ($data['type'] == 'Undo') {
 886                         $data['object'] = self::createActivityFromItem($item_id, true);
 887                 } else {
 888                         $data['diaspora:guid'] = $item['guid'];
 889                         if (!empty($item['signed_text'])) {
 890                                 $data['diaspora:like'] = $item['signed_text'];
 891                         }
 892                         $data['object'] = $item['thr-parent'];
 893                 }
 894
 895                 if (!empty($item['contact-uid'])) {
 896                         $uid = $item['contact-uid'];
 897                 } else {
 898                         $uid = $item['uid'];
 899                 }
 900
 901                 $owner = User::getOwnerDataById($uid);
 902
 903                 if (!$object_mode && !empty($owner)) {
 904                         return LDSignature::sign($data, $owner);
 905                 } else {
 906                         return $data;
 907                 }
 908
 909                 /// @todo Create "conversation" entry
 910         }
 911
 912         /**
 913          * Creates an object array for a given item id
 914          *
 915          * @param integer $item_id
 916          *
 917          * @return array with the object data
 918          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 919          * @throws \ImagickException
 920          */
 921         public static function createObjectFromItemID($item_id)
 922         {
 923                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 924
 925                 if (!DBA::isResult($item)) {
 926                         return false;
 927                 }
 928
 929                 $data = ['@context' => ActivityPub::CONTEXT];
 930                 $data = array_merge($data, self::createNote($item));
 931
 932                 return $data;
 933         }
 934
 935         /**
 936          * Creates a location entry for a given item array
 937          *
 938          * @param array $item
 939          *
 940          * @return array with location array
 941          */
 942         private static function createLocation($item)
 943         {
 944                 $location = ['type' => 'Place'];
 945
 946                 if (!empty($item['location'])) {
 947                         $location['name'] = $item['location'];
 948                 }
 949
 950                 $coord = [];
 951
 952                 if (empty($item['coord'])) {
 953                         $coord = Map::getCoordinates($item['location']);
 954                 } else {
 955                         $coords = explode(' ', $item['coord']);
 956                         if (count($coords) == 2) {
 957                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 958                         }
 959                 }
 960
 961                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 962                         $location['latitude'] = $coord['lat'];
 963                         $location['longitude'] = $coord['lon'];
 964                 }
 965
 966                 return $location;
 967         }
 968
 969         /**
 970          * Returns a tag array for a given item array
 971          *
 972          * @param array $item
 973          *
 974          * @return array of tags
 975          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 976          */
 977         private static function createTagList($item)
 978         {
 979                 $tags = [];
 980
 981                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 982                 foreach ($terms as $term) {
 983                         if ($term['type'] == Term::HASHTAG) {
 984                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 985                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 986                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 987                                 $contact = Contact::getDetailsByURL($term['url']);
 988                                 if (!empty($contact['addr'])) {
 989                                         $mention = '@' . $contact['addr'];
 990                                 } else {
 991                                         $mention = '@' . $term['url'];
 992                                 }
 993
 994                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 995                         }
 996                 }
 997                 return $tags;
 998         }
 999
1000         /**
1001          * Adds attachment data to the JSON document
1002          *
1003          * @param array  $item Data of the item that is to be posted
1004          * @param string $type Object type
1005          *
1006          * @return array with attachment data
1007          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1008          */
1009         private static function createAttachmentList($item, $type)
1010         {
1011                 $attachments = [];
1012
1013                 $arr = explode('[/attach],', $item['attach']);
1014                 if (count($arr)) {
1015                         foreach ($arr as $r) {
1016                                 $matches = false;
1017                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1018                                 if ($cnt) {
1019                                         $attributes = ['type' => 'Document',
1020                                                         'mediaType' => $matches[3],
1021                                                         'url' => $matches[1],
1022                                                         'name' => null];
1023
1024                                         if (trim($matches[4]) != '') {
1025                                                 $attributes['name'] = trim($matches[4]);
1026                                         }
1027
1028                                         $attachments[] = $attributes;
1029                                 }
1030                         }
1031                 }
1032
1033                 if ($type != 'Note') {
1034                         return $attachments;
1035                 }
1036
1037                 // Simplify image codes
1038                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1039
1040                 // Grab all pictures without alternative descriptions and create attachments out of them
1041                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1042                         foreach ($pictures[1] as $picture) {
1043                                 $imgdata = Image::getInfoFromURL($picture);
1044                                 if ($imgdata) {
1045                                         $attachments[] = ['type' => 'Document',
1046                                                 'mediaType' => $imgdata['mime'],
1047                                                 'url' => $picture,
1048                                                 'name' => null];
1049                                 }
1050                         }
1051                 }
1052
1053                 // Grab all pictures with alternative description and create attachments out of them
1054                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
1055                         foreach ($pictures as $picture) {
1056                                 $imgdata = Image::getInfoFromURL($picture[1]);
1057                                 if ($imgdata) {
1058                                         $attachments[] = ['type' => 'Document',
1059                                                 'mediaType' => $imgdata['mime'],
1060                                                 'url' => $picture[1],
1061                                                 'name' => $picture[2]];
1062                                 }
1063                         }
1064                 }
1065
1066                 return $attachments;
1067         }
1068
1069         /**
1070          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
1071          *
1072          * @param array $match Matching values for the callback
1073          * @return string Replaced mention
1074          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1075          */
1076         private static function mentionCallback($match)
1077         {
1078                 if (empty($match[1])) {
1079                         return '';
1080                 }
1081
1082                 $data = Contact::getDetailsByURL($match[1]);
1083                 if (empty($data['nick'])) {
1084                         return $match[0];
1085                 }
1086
1087                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1088         }
1089
1090         /**
1091          * Remove image elements and replaces them with links to the image
1092          *
1093          * @param string $body
1094          *
1095          * @return string with replaced elements
1096          */
1097         private static function removePictures($body)
1098         {
1099                 // Simplify image codes
1100                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1101
1102                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
1103                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
1104
1105                 return $body;
1106         }
1107
1108         /**
1109          * Fetches the "context" value for a givem item array from the "conversation" table
1110          *
1111          * @param array $item
1112          *
1113          * @return string with context url
1114          * @throws \Exception
1115          */
1116         private static function fetchContextURLForItem($item)
1117         {
1118                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1119                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1120                         $context_uri = $conversation['conversation-href'];
1121                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1122                         $context_uri = $conversation['conversation-uri'];
1123                 } else {
1124                         $context_uri = $item['parent-uri'] . '#context';
1125                 }
1126                 return $context_uri;
1127         }
1128
1129         /**
1130          * Returns if the post contains sensitive content ("nsfw")
1131          *
1132          * @param integer $item_id
1133          *
1134          * @return boolean
1135          * @throws \Exception
1136          */
1137         private static function isSensitive($item_id)
1138         {
1139                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
1140                 return DBA::exists('term', $condition);
1141         }
1142
1143         /**
1144          * Creates event data
1145          *
1146          * @param array $item
1147          *
1148          * @return array with the event data
1149          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1150          */
1151         public static function createEvent($item)
1152         {
1153                 $event = [];
1154                 $event['name'] = $item['event-summary'];
1155                 $event['content'] = BBCode::convert($item['event-desc'], false, 9);
1156                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1157
1158                 if (!$item['event-nofinish']) {
1159                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1160                 }
1161
1162                 if (!empty($item['event-location'])) {
1163                         $item['location'] = $item['event-location'];
1164                         $event['location'] = self::createLocation($item);
1165                 }
1166
1167                 return $event;
1168         }
1169
1170         /**
1171          * Creates a note/article object array
1172          *
1173          * @param array $item
1174          *
1175          * @return array with the object data
1176          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1177          * @throws \ImagickException
1178          */
1179         public static function createNote($item)
1180         {
1181                 if ($item['event-type'] == 'event') {
1182                         $type = 'Event';
1183                 } elseif (!empty($item['title'])) {
1184                         $type = 'Article';
1185                 } else {
1186                         $type = 'Note';
1187                 }
1188
1189                 if ($item['deleted']) {
1190                         $type = 'Tombstone';
1191                 }
1192
1193                 $data = [];
1194                 $data['id'] = $item['uri'];
1195                 $data['type'] = $type;
1196
1197                 if ($item['deleted']) {
1198                         return $data;
1199                 }
1200
1201                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1202
1203                 if ($item['uri'] != $item['thr-parent']) {
1204                         $data['inReplyTo'] = $item['thr-parent'];
1205                 } else {
1206                         $data['inReplyTo'] = null;
1207                 }
1208
1209                 $data['diaspora:guid'] = $item['guid'];
1210                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1211
1212                 if ($item['created'] != $item['edited']) {
1213                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1214                 }
1215
1216                 $data['url'] = $item['plink'];
1217                 $data['attributedTo'] = $item['author-link'];
1218                 $data['sensitive'] = self::isSensitive($item['id']);
1219                 $data['context'] = self::fetchContextURLForItem($item);
1220
1221                 if (!empty($item['title'])) {
1222                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1223                 }
1224
1225                 $permission_block = self::createPermissionBlockForItem($item, false);
1226
1227                 $body = $item['body'];
1228
1229                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1230                         $body = self::prependMentions($body, $permission_block);
1231                 }
1232
1233                 if ($type == 'Note') {
1234                         $body = self::removePictures($body);
1235                 } elseif (($type == 'Article') && empty($data['summary'])) {
1236                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1237                 }
1238
1239                 if ($type == 'Event') {
1240                         $data = array_merge($data, self::createEvent($item));
1241                 } else {
1242                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1243                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1244
1245                         $data['content'] = BBCode::convert($body, false, 9);
1246                 }
1247
1248                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1249
1250                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1251                         $data['diaspora:comment'] = $item['signed_text'];
1252                 }
1253
1254                 $data['attachment'] = self::createAttachmentList($item, $type);
1255                 $data['tag'] = self::createTagList($item);
1256
1257                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1258                         $data['location'] = self::createLocation($item);
1259                 }
1260
1261                 if (!empty($item['app'])) {
1262                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1263                 }
1264
1265                 $data = array_merge($data, $permission_block);
1266
1267                 return $data;
1268         }
1269
1270         /**
1271          * Creates an an "add tag" entry
1272          *
1273          * @param array $item
1274          * @param array $data activity data
1275          *
1276          * @return array with activity data for adding tags
1277          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1278          * @throws \ImagickException
1279          */
1280         private static function createAddTag($item, $data)
1281         {
1282                 $object = XML::parseString($item['object'], false);
1283                 $target = XML::parseString($item["target"], false);
1284
1285                 $data['diaspora:guid'] = $item['guid'];
1286                 $data['actor'] = $item['author-link'];
1287                 $data['target'] = (string)$target->id;
1288                 $data['summary'] = BBCode::toPlaintext($item['body']);
1289                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1290
1291                 return $data;
1292         }
1293
1294         /**
1295          * Creates an announce object entry
1296          *
1297          * @param array $item
1298          * @param array $data activity data
1299          *
1300          * @return array with activity data
1301          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1302          * @throws \ImagickException
1303          */
1304         private static function createAnnounce($item, $data)
1305         {
1306                 $orig_body = $item['body'];
1307                 $announce = api_share_as_retweet($item);
1308                 if (empty($announce['plink'])) {
1309                         $data['type'] = 'Create';
1310                         $data['object'] = self::createNote($item);
1311                         return $data;
1312                 }
1313
1314                 // Fetch the original id of the object
1315                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1316                 if (!empty($activity)) {
1317                         $ldactivity = JsonLD::compact($activity);
1318                         $id = JsonLD::fetchElement($ldactivity, '@id');
1319                         $type = str_replace('as:', '', JsonLD::fetchElement($ldactivity, '@type'));
1320                         if (!empty($id)) {
1321                                 if (empty($announce['share-pre-body'])) {
1322                                         // Pure announce, without a quote
1323                                         $data['type'] = 'Announce';
1324                                         $data['object'] = $id;
1325                                         return $data;
1326                                 }
1327
1328                                 // Quote
1329                                 $data['type'] = 'Create';
1330                                 $item['body'] = trim($announce['share-pre-body']) . "\n" . $id;
1331                                 $data['object'] = self::createNote($item);
1332
1333                                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1334                                 $data['object']['attachment'][] = ['type' => $type, 'id' => $id];
1335
1336                                 $data['object']['source']['content'] = $orig_body;
1337                                 return $data;
1338                         }
1339                 }
1340
1341                 $item['body'] = $orig_body;
1342                 $data['type'] = 'Create';
1343                 $data['object'] = self::createNote($item);
1344                 return $data;
1345         }
1346
1347         /**
1348          * Creates an activity id for a given contact id
1349          *
1350          * @param integer $cid Contact ID of target
1351          *
1352          * @return bool|string activity id
1353          */
1354         public static function activityIDFromContact($cid)
1355         {
1356                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1357                 if (!DBA::isResult($contact)) {
1358                         return false;
1359                 }
1360
1361                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1362                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1363                 return System::baseUrl() . '/activity/' . $uuid;
1364         }
1365
1366         /**
1367          * Transmits a contact suggestion to a given inbox
1368          *
1369          * @param integer $uid           User ID
1370          * @param string  $inbox         Target inbox
1371          * @param integer $suggestion_id Suggestion ID
1372          *
1373          * @return boolean was the transmission successful?
1374          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1375          */
1376         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1377         {
1378                 $owner = User::getOwnerDataById($uid);
1379
1380                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1381
1382                 $data = ['@context' => ActivityPub::CONTEXT,
1383                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1384                         'type' => 'Announce',
1385                         'actor' => $owner['url'],
1386                         'object' => $suggestion['url'],
1387                         'content' => $suggestion['note'],
1388                         'instrument' => self::getService(),
1389                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1390                         'cc' => []];
1391
1392                 $signed = LDSignature::sign($data, $owner);
1393
1394                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1395                 return HTTPSignature::transmit($signed, $inbox, $uid);
1396         }
1397
1398         /**
1399          * Transmits a profile relocation to a given inbox
1400          *
1401          * @param integer $uid   User ID
1402          * @param string  $inbox Target inbox
1403          *
1404          * @return boolean was the transmission successful?
1405          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1406          */
1407         public static function sendProfileRelocation($uid, $inbox)
1408         {
1409                 $owner = User::getOwnerDataById($uid);
1410
1411                 $data = ['@context' => ActivityPub::CONTEXT,
1412                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1413                         'type' => 'dfrn:relocate',
1414                         'actor' => $owner['url'],
1415                         'object' => $owner['url'],
1416                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1417                         'instrument' => self::getService(),
1418                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1419                         'cc' => []];
1420
1421                 $signed = LDSignature::sign($data, $owner);
1422
1423                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1424                 return HTTPSignature::transmit($signed, $inbox, $uid);
1425         }
1426
1427         /**
1428          * Transmits a profile deletion to a given inbox
1429          *
1430          * @param integer $uid   User ID
1431          * @param string  $inbox Target inbox
1432          *
1433          * @return boolean was the transmission successful?
1434          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1435          */
1436         public static function sendProfileDeletion($uid, $inbox)
1437         {
1438                 $owner = User::getOwnerDataById($uid);
1439
1440                 if (empty($owner)) {
1441                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1442                         return false;
1443                 }
1444
1445                 if (empty($owner['uprvkey'])) {
1446                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1447                         return false;
1448                 }
1449
1450                 $data = ['@context' => ActivityPub::CONTEXT,
1451                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1452                         'type' => 'Delete',
1453                         'actor' => $owner['url'],
1454                         'object' => $owner['url'],
1455                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1456                         'instrument' => self::getService(),
1457                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1458                         'cc' => []];
1459
1460                 $signed = LDSignature::sign($data, $owner);
1461
1462                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1463                 return HTTPSignature::transmit($signed, $inbox, $uid);
1464         }
1465
1466         /**
1467          * Transmits a profile change to a given inbox
1468          *
1469          * @param integer $uid   User ID
1470          * @param string  $inbox Target inbox
1471          *
1472          * @return boolean was the transmission successful?
1473          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1474          * @throws \ImagickException
1475          */
1476         public static function sendProfileUpdate($uid, $inbox)
1477         {
1478                 $owner = User::getOwnerDataById($uid);
1479                 $profile = APContact::getByURL($owner['url']);
1480
1481                 $data = ['@context' => ActivityPub::CONTEXT,
1482                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1483                         'type' => 'Update',
1484                         'actor' => $owner['url'],
1485                         'object' => self::getProfile($uid),
1486                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1487                         'instrument' => self::getService(),
1488                         'to' => [$profile['followers']],
1489                         'cc' => []];
1490
1491                 $signed = LDSignature::sign($data, $owner);
1492
1493                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1494                 return HTTPSignature::transmit($signed, $inbox, $uid);
1495         }
1496
1497         /**
1498          * Transmits a given activity to a target
1499          *
1500          * @param string  $activity Type name
1501          * @param string  $target   Target profile
1502          * @param integer $uid      User ID
1503          * @return bool
1504          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1505          * @throws \ImagickException
1506          * @throws \Exception
1507          */
1508         public static function sendActivity($activity, $target, $uid, $id = '')
1509         {
1510                 $profile = APContact::getByURL($target);
1511                 if (empty($profile['inbox'])) {
1512                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1513                         return;
1514                 }
1515
1516                 $owner = User::getOwnerDataById($uid);
1517
1518                 if (empty($id)) {
1519                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1520                 }
1521
1522                 $data = ['@context' => ActivityPub::CONTEXT,
1523                         'id' => $id,
1524                         'type' => $activity,
1525                         'actor' => $owner['url'],
1526                         'object' => $profile['url'],
1527                         'instrument' => self::getService(),
1528                         'to' => [$profile['url']]];
1529
1530                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1531
1532                 $signed = LDSignature::sign($data, $owner);
1533                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1534         }
1535
1536         /**
1537          * Transmits a "follow object" activity to a target
1538          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1539          *
1540          * @param string  $object Object URL
1541          * @param string  $target Target profile
1542          * @param integer $uid    User ID
1543          * @return bool
1544          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1545          * @throws \ImagickException
1546          * @throws \Exception
1547          */
1548         public static function sendFollowObject($object, $target, $uid = 0)
1549         {
1550                 $profile = APContact::getByURL($target);
1551                 if (empty($profile['inbox'])) {
1552                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1553                         return;
1554                 }
1555
1556                 if (empty($uid)) {
1557                         // Fetch the list of administrators
1558                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1559
1560                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1561                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1562                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1563                         $uid = $first_user['uid'];
1564                 }
1565
1566                 $condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1567                         'author-id' => Contact::getPublicIdByUserId($uid)];
1568                 if (Item::exists($condition)) {
1569                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1570                         return false;
1571                 }
1572
1573                 $owner = User::getOwnerDataById($uid);
1574
1575                 $data = ['@context' => ActivityPub::CONTEXT,
1576                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1577                         'type' => 'Follow',
1578                         'actor' => $owner['url'],
1579                         'object' => $object,
1580                         'instrument' => self::getService(),
1581                         'to' => [$profile['url']]];
1582
1583                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1584
1585                 $signed = LDSignature::sign($data, $owner);
1586                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1587         }
1588
1589         /**
1590          * Transmit a message that the contact request had been accepted
1591          *
1592          * @param string  $target Target profile
1593          * @param         $id
1594          * @param integer $uid    User ID
1595          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1596          * @throws \ImagickException
1597          */
1598         public static function sendContactAccept($target, $id, $uid)
1599         {
1600                 $profile = APContact::getByURL($target);
1601                 if (empty($profile['inbox'])) {
1602                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1603                         return;
1604                 }
1605
1606                 $owner = User::getOwnerDataById($uid);
1607                 $data = ['@context' => ActivityPub::CONTEXT,
1608                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1609                         'type' => 'Accept',
1610                         'actor' => $owner['url'],
1611                         'object' => [
1612                                 'id' => (string)$id,
1613                                 'type' => 'Follow',
1614                                 'actor' => $profile['url'],
1615                                 'object' => $owner['url']
1616                         ],
1617                         'instrument' => self::getService(),
1618                         'to' => [$profile['url']]];
1619
1620                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1621
1622                 $signed = LDSignature::sign($data, $owner);
1623                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1624         }
1625
1626         /**
1627          * Reject a contact request or terminates the contact relation
1628          *
1629          * @param string  $target Target profile
1630          * @param         $id
1631          * @param integer $uid    User ID
1632          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1633          * @throws \ImagickException
1634          */
1635         public static function sendContactReject($target, $id, $uid)
1636         {
1637                 $profile = APContact::getByURL($target);
1638                 if (empty($profile['inbox'])) {
1639                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1640                         return;
1641                 }
1642
1643                 $owner = User::getOwnerDataById($uid);
1644                 $data = ['@context' => ActivityPub::CONTEXT,
1645                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1646                         'type' => 'Reject',
1647                         'actor' => $owner['url'],
1648                         'object' => [
1649                                 'id' => (string)$id,
1650                                 'type' => 'Follow',
1651                                 'actor' => $profile['url'],
1652                                 'object' => $owner['url']
1653                         ],
1654                         'instrument' => self::getService(),
1655                         'to' => [$profile['url']]];
1656
1657                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1658
1659                 $signed = LDSignature::sign($data, $owner);
1660                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1661         }
1662
1663         /**
1664          * Transmits a message that we don't want to follow this contact anymore
1665          *
1666          * @param string  $target Target profile
1667          * @param integer $uid    User ID
1668          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1669          * @throws \ImagickException
1670          * @throws \Exception
1671          */
1672         public static function sendContactUndo($target, $cid, $uid)
1673         {
1674                 $profile = APContact::getByURL($target);
1675                 if (empty($profile['inbox'])) {
1676                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1677                         return;
1678                 }
1679
1680                 $object_id = self::activityIDFromContact($cid);
1681                 if (empty($object_id)) {
1682                         return;
1683                 }
1684
1685                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1686
1687                 $owner = User::getOwnerDataById($uid);
1688                 $data = ['@context' => ActivityPub::CONTEXT,
1689                         'id' => $id,
1690                         'type' => 'Undo',
1691                         'actor' => $owner['url'],
1692                         'object' => ['id' => $object_id, 'type' => 'Follow',
1693                                 'actor' => $owner['url'],
1694                                 'object' => $profile['url']],
1695                         'instrument' => self::getService(),
1696                         'to' => [$profile['url']]];
1697
1698                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1699
1700                 $signed = LDSignature::sign($data, $owner);
1701                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1702         }
1703
1704         private static function prependMentions($body, array $permission_block)
1705         {
1706                 if (Config::get('system', 'disable_implicit_mentions')) {
1707                         return $body;
1708                 }
1709
1710                 $mentions = [];
1711
1712                 foreach ($permission_block['to'] as $profile_url) {
1713                         $profile = Contact::getDetailsByURL($profile_url);
1714                         if (!empty($profile['addr'])
1715                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1716                                 && !strstr($body, $profile['addr'])
1717                                 && !strstr($body, $profile_url)
1718                         ) {
1719                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1720                         }
1721                 }
1722
1723                 $mentions[] = $body;
1724
1725                 return implode(' ', $mentions);
1726         }
1727 }