src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\Plaintext;
  27 use Friendica\Core\Cache\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\APContact;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\Item;
  37 use Friendica\Model\ItemURI;
  38 use Friendica\Model\Profile;
  39 use Friendica\Model\Photo;
  40 use Friendica\Model\Tag;
  41 use Friendica\Model\User;
  42 use Friendica\Protocol\Activity;
  43 use Friendica\Protocol\ActivityPub;
  44 use Friendica\Util\DateTimeFormat;
  45 use Friendica\Util\HTTPSignature;
  46 use Friendica\Util\Images;
  47 use Friendica\Util\JsonLD;
  48 use Friendica\Util\LDSignature;
  49 use Friendica\Util\Map;
  50 use Friendica\Util\Network;
  51 use Friendica\Util\XML;
  52
  53 require_once 'include/api.php';
  54 require_once 'mod/share.php';
  55
  56 /**
  57  * ActivityPub Transmitter Protocol class
  58  *
  59  * To-Do:
  60  * @todo Undo Announce
  61  */
  62 class Transmitter
  63 {
  64         /**
  65          * Add relay servers to the list of inboxes
  66          *
  67          * @param array $inboxes
  68          * @return array inboxes with added relay servers
  69          */
  70         public static function addRelayServerInboxes(array $inboxes = [])
  71         {
  72                 $contacts = DBA::select('apcontact', ['inbox'],
  73                         ["`type` = ? AND `url` IN (SELECT `url` FROM `contact` WHERE `uid` = ? AND `rel` IN (?, ?))",
  74                                 'Application', 0, Contact::FOLLOWER, Contact::FRIEND]);
  75                 while ($contact = DBA::fetch($contacts)) {
  76                         $inboxes[] = $contact['inbox'];
  77                 }
  78                 DBA::close($contacts);
  79
  80                 return $inboxes;
  81         }
  82
  83         /**
  84          * Subscribe to a relay
  85          *
  86          * @param string $url Subscribe actor url
  87          * @return bool success
  88          */
  89         public static function sendRelayFollow(string $url)
  90         {
  91                 $contact = Contact::getByURL($url);
  92                 if (empty($contact)) {
  93                         return false;
  94                 }
  95
  96                 $activity_id = ActivityPub\Transmitter::activityIDFromContact($contact['id']);
  97                 $success = ActivityPub\Transmitter::sendActivity('Follow', $url, 0, $activity_id);
  98                 if ($success) {
  99                         $rel = $contact['rel'] == Contact::SHARING ? Contact::FRIEND : Contact::FOLLOWER;
 100                         DBA::update('contact', ['rel' => $rel], ['id' => $contact['id']]);
 101                 }
 102
 103                 return $success;
 104         }
 105
 106         /**
 107          * Unsubscribe from a relay
 108          *
 109          * @param string $url   Subscribe actor url
 110          * @param bool   $force Set the relay status as non follower even if unsubscribe hadn't worked
 111          * @return bool success
 112          */
 113         public static function sendRelayUndoFollow(string $url, bool $force = false)
 114         {
 115                 $contact = Contact::getByURL($url);
 116                 if (empty($contact)) {
 117                         return false;
 118                 }
 119
 120                 $success = self::sendContactUndo($url, $contact['id'], 0);
 121                 if ($success || $force) {
 122                         $rel = $contact['rel'] == Contact::FRIEND ? Contact::SHARING : Contact::NOTHING;
 123                         DBA::update('contact', ['rel' => $rel], ['id' => $contact['id']]);
 124                 }
 125
 126                 return $success;
 127         }
 128
 129         /**
 130          * Collects a list of contacts of the given owner
 131          *
 132          * @param array     $owner  Owner array
 133          * @param int|array $rel    The relevant value(s) contact.rel should match
 134          * @param string    $module The name of the relevant AP endpoint module (followers|following)
 135          * @param integer   $page   Page number
 136          *
 137          * @return array of owners
 138          * @throws \Exception
 139          */
 140         public static function getContacts($owner, $rel, $module, $page = null)
 141         {
 142                 $parameters = [
 143                         'rel' => $rel,
 144                         'uid' => $owner['uid'],
 145                         'self' => false,
 146                         'deleted' => false,
 147                         'hidden' => false,
 148                         'archive' => false,
 149                         'pending' => false
 150                 ];
 151                 $condition = DBA::buildCondition($parameters);
 152
 153                 $sql = "SELECT COUNT(*) as `count`
 154                         FROM `contact`
 155                         JOIN `apcontact` ON `apcontact`.`url` = `contact`.`url`
 156                         " . $condition;
 157
 158                 $contacts = DBA::fetchFirst($sql, ...$parameters);
 159
 160                 $modulePath = '/' . $module . '/';
 161
 162                 $data = ['@context' => ActivityPub::CONTEXT];
 163                 $data['id'] = DI::baseUrl() . $modulePath . $owner['nickname'];
 164                 $data['type'] = 'OrderedCollection';
 165                 $data['totalItems'] = $contacts['count'];
 166
 167                 // When we hide our friends we will only show the pure number but don't allow more.
 168                 $profile = Profile::getByUID($owner['uid']);
 169                 if (!empty($profile['hide-friends'])) {
 170                         return $data;
 171                 }
 172
 173                 if (empty($page)) {
 174                         $data['first'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=1';
 175                 } else {
 176                         $data['type'] = 'OrderedCollectionPage';
 177                         $list = [];
 178
 179                         $sql = "SELECT `contact`.`url`
 180                                 FROM `contact`
 181                                 JOIN `apcontact` ON `apcontact`.`url` = `contact`.`url`
 182                                 " . $condition . "
 183                                 LIMIT ?, ?";
 184
 185                         $parameters[] = ($page - 1) * 100;
 186                         $parameters[] = 100;
 187
 188                         $contacts = DBA::p($sql, ...$parameters);
 189                         while ($contact = DBA::fetch($contacts)) {
 190                                 $list[] = $contact['url'];
 191                         }
 192                         DBA::close($contacts);
 193
 194                         if (!empty($list)) {
 195                                 $data['next'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=' . ($page + 1);
 196                         }
 197
 198                         $data['partOf'] = DI::baseUrl() . $modulePath . $owner['nickname'];
 199
 200                         $data['orderedItems'] = $list;
 201                 }
 202
 203                 return $data;
 204         }
 205
 206         /**
 207          * Public posts for the given owner
 208          *
 209          * @param array   $owner     Owner array
 210          * @param integer $page      Page number
 211          * @param string  $requester URL of requesting account
 212          *
 213          * @return array of posts
 214          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 215          * @throws \ImagickException
 216          */
 217         public static function getOutbox($owner, $page = null, $requester = '')
 218         {
 219                 $public_contact = Contact::getIdForURL($owner['url']);
 220                 $condition = ['uid' => 0, 'contact-id' => $public_contact,
 221                         'private' => [Item::PUBLIC, Item::UNLISTED]];
 222
 223                 if (!empty($requester)) {
 224                         $requester_id = Contact::getIdForURL($requester, $owner['uid']);
 225                         if (!empty($requester_id)) {
 226                                 $permissionSets = DI::permissionSet()->selectByContactId($requester_id, $owner['uid']);
 227                                 if (!empty($permissionSets)) {
 228                                         $condition = ['uid' => $owner['uid'], 'origin' => true,
 229                                                 'psid' => array_merge($permissionSets->column('id'),
 230                                                         [DI::permissionSet()->getIdFromACL($owner['uid'], '', '', '', '')])];
 231                                 }
 232                         }
 233                 }
 234
 235                 $condition = array_merge($condition,
 236                         ['author-id' => $public_contact,
 237                         'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 238                         'deleted' => false, 'visible' => true, 'moderated' => false]);
 239
 240                 $count = DBA::count('item', $condition);
 241
 242                 $data = ['@context' => ActivityPub::CONTEXT];
 243                 $data['id'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 244                 $data['type'] = 'OrderedCollection';
 245                 $data['totalItems'] = $count;
 246
 247                 if (empty($page)) {
 248                         $data['first'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 249                 } else {
 250                         $data['type'] = 'OrderedCollectionPage';
 251                         $list = [];
 252
 253                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 254
 255                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 256                         while ($item = Item::fetch($items)) {
 257                                 $activity = self::createActivityFromItem($item['id'], true);
 258                                 $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 259
 260                                 // Only list "Create" activity objects here, no reshares
 261                                 if (!empty($activity['object']) && ($activity['type'] == 'Create')) {
 262                                         $list[] = $activity['object'];
 263                                 }
 264                         }
 265
 266                         if (!empty($list)) {
 267                                 $data['next'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 268                         }
 269
 270                         $data['partOf'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 271
 272                         $data['orderedItems'] = $list;
 273                 }
 274
 275                 return $data;
 276         }
 277
 278         /**
 279          * Return the service array containing information the used software and it's url
 280          *
 281          * @return array with service data
 282          */
 283         private static function getService()
 284         {
 285                 return ['type' => 'Service',
 286                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 287                         'url' => DI::baseUrl()->get()];
 288         }
 289
 290         /**
 291          * Return the ActivityPub profile of the given user
 292          *
 293          * @param integer $uid User ID
 294          * @return array with profile data
 295          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 296          */
 297         public static function getProfile($uid)
 298         {
 299                 if ($uid != 0) {
 300                         $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 301                                 'account_removed' => false, 'verified' => true];
 302                         $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 303                         $user = DBA::selectFirst('user', $fields, $condition);
 304                         if (!DBA::isResult($user)) {
 305                                 return [];
 306                         }
 307
 308                         $fields = ['locality', 'region', 'country-name'];
 309                         $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid]);
 310                         if (!DBA::isResult($profile)) {
 311                                 return [];
 312                         }
 313
 314                         $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 315                         $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 316                         if (!DBA::isResult($contact)) {
 317                                 return [];
 318                         }
 319                 } else {
 320                         $contact = User::getSystemAccount();
 321                         $user = ['guid' => '', 'nickname' => $contact['nick'], 'pubkey' => $contact['pubkey'],
 322                                 'account-type' => $contact['contact-type'], 'page-flags' => User::PAGE_FLAGS_NORMAL];
 323                         $profile = ['locality' => '', 'region' => '', 'country-name' => ''];
 324                 }
 325
 326                 $data = ['@context' => ActivityPub::CONTEXT];
 327                 $data['id'] = $contact['url'];
 328
 329                 if (!empty($user['guid'])) {
 330                         $data['diaspora:guid'] = $user['guid'];
 331                 }
 332
 333                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 334
 335                 if ($uid != 0) {
 336                         $data['following'] = DI::baseUrl() . '/following/' . $user['nickname'];
 337                         $data['followers'] = DI::baseUrl() . '/followers/' . $user['nickname'];
 338                         $data['inbox'] = DI::baseUrl() . '/inbox/' . $user['nickname'];
 339                         $data['outbox'] = DI::baseUrl() . '/outbox/' . $user['nickname'];
 340                 } else {
 341                         $data['inbox'] = DI::baseUrl() . '/friendica/inbox';
 342                 }
 343
 344                 $data['preferredUsername'] = $user['nickname'];
 345                 $data['name'] = $contact['name'];
 346
 347                 if (!empty($profile['country-name'] . $profile['region'] . $profile['locality'])) {
 348                         $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 349                                 'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 350                 }
 351
 352                 if (!empty($contact['about'])) {
 353                         $data['summary'] = BBCode::convert($contact['about'], false);
 354                 }
 355
 356                 $data['url'] = $contact['url'];
 357                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 358                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 359                         'owner' => $contact['url'],
 360                         'publicKeyPem' => $user['pubkey']];
 361                 $data['endpoints'] = ['sharedInbox' => DI::baseUrl() . '/inbox'];
 362                 $data['icon'] = ['type' => 'Image',
 363                         'url' => $contact['photo']];
 364
 365                 $data['generator'] = self::getService();
 366
 367                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 368                 return $data;
 369         }
 370
 371         /**
 372          * @param string $username
 373          * @return array
 374          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 375          */
 376         public static function getDeletedUser($username)
 377         {
 378                 return [
 379                         '@context' => ActivityPub::CONTEXT,
 380                         'id' => DI::baseUrl() . '/profile/' . $username,
 381                         'type' => 'Tombstone',
 382                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 383                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 384                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 385                 ];
 386         }
 387
 388         /**
 389          * Returns an array with permissions of a given item array
 390          *
 391          * @param array $item
 392          *
 393          * @return array with permissions
 394          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 395          * @throws \ImagickException
 396          */
 397         private static function fetchPermissionBlockFromConversation($item)
 398         {
 399                 if (empty($item['thr-parent'])) {
 400                         return [];
 401                 }
 402
 403                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 404                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 405                 if (!DBA::isResult($conversation)) {
 406                         return [];
 407                 }
 408
 409                 $activity = json_decode($conversation['source'], true);
 410
 411                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 412                 $profile = APContact::getByURL($actor);
 413
 414                 $item_profile = APContact::getByURL($item['author-link']);
 415                 $exclude[] = $item['author-link'];
 416
 417                 if ($item['gravity'] == GRAVITY_PARENT) {
 418                         $exclude[] = $item['owner-link'];
 419                 }
 420
 421                 $permissions['to'][] = $actor;
 422
 423                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 424                         if (empty($activity[$element])) {
 425                                 continue;
 426                         }
 427                         if (is_string($activity[$element])) {
 428                                 $activity[$element] = [$activity[$element]];
 429                         }
 430
 431                         foreach ($activity[$element] as $receiver) {
 432                                 if (empty($receiver)) {
 433                                         continue;
 434                                 }
 435
 436                                 if (!empty($profile['followers']) && $receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 437                                         $permissions[$element][] = $item_profile['followers'];
 438                                 } elseif (!in_array($receiver, $exclude)) {
 439                                         $permissions[$element][] = $receiver;
 440                                 }
 441                         }
 442                 }
 443                 return $permissions;
 444         }
 445
 446         /**
 447          * Creates an array of permissions from an item thread
 448          *
 449          * @param array   $item       Item array
 450          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 451          * @param integer $last_id    Last item id for adding receivers
 452          * @param boolean $forum_mode "true" means that we are sending content to a forum
 453          *
 454          * @return array with permission data
 455          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 456          * @throws \ImagickException
 457          */
 458         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 459         {
 460                 if ($last_id == 0) {
 461                         $last_id = $item['id'];
 462                 }
 463
 464                 $always_bcc = false;
 465                 $isforum = false;
 466
 467                 // Check if we should always deliver our stuff via BCC
 468                 if (!empty($item['uid'])) {
 469                         $profile = User::getOwnerDataById($item['uid']);
 470                         if (!empty($profile)) {
 471                                 $always_bcc = $profile['hide-friends'];
 472                                 $isforum = $profile['account-type'] == User::ACCOUNT_TYPE_COMMUNITY;
 473                         }
 474                 }
 475
 476                 if (DI::config()->get('system', 'ap_always_bcc')) {
 477                         $always_bcc = true;
 478                 }
 479
 480                 if ((self::isAnnounce($item) && !$isforum) || DI::config()->get('debug', 'total_ap_delivery')) {
 481                         // Will be activated in a later step
 482                         $networks = Protocol::FEDERATED;
 483                 } else {
 484                         // For now only send to these contacts:
 485                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 486                 }
 487
 488                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 489
 490                 if ($item['gravity'] == GRAVITY_PARENT) {
 491                         $actor_profile = APContact::getByURL($item['owner-link']);
 492                 } else {
 493                         $actor_profile = APContact::getByURL($item['author-link']);
 494                 }
 495
 496                 $terms = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 497
 498                 if ($item['private'] != Item::PRIVATE) {
 499                         // Directly mention the original author upon a quoted reshare.
 500                         // Else just ensure that the original author receives the reshare.
 501                         $announce = self::getAnnounceArray($item);
 502                         if (!empty($announce['comment'])) {
 503                                 $data['to'][] = $announce['actor']['url'];
 504                         } elseif (!empty($announce)) {
 505                                 $data['cc'][] = $announce['actor']['url'];
 506                         }
 507
 508                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 509
 510                         // Check if the item is completely public or unlisted
 511                         if ($item['private'] == Item::PUBLIC) {
 512                                 $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 513                         } else {
 514                                 $data['cc'][] = ActivityPub::PUBLIC_COLLECTION;
 515                         }
 516
 517                         foreach ($terms as $term) {
 518                                 $profile = APContact::getByURL($term['url'], false);
 519                                 if (!empty($profile)) {
 520                                         $data['to'][] = $profile['url'];
 521                                 }
 522                         }
 523                 } else {
 524                         $receiver_list = Item::enumeratePermissions($item, true);
 525
 526                         foreach ($terms as $term) {
 527                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 528                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 529                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 530                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 531                                                 continue;
 532                                         }
 533
 534                                         if ($isforum && DBA::isResult($contact) && ($contact['dfrn'] == Protocol::DFRN)) {
 535                                                 continue;
 536                                         }
 537
 538                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 539                                                 $data['to'][] = $profile['url'];
 540                                         }
 541                                 }
 542                         }
 543
 544                         foreach ($receiver_list as $receiver) {
 545                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 546                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 547                                         continue;
 548                                 }
 549
 550                                 if ($isforum && DBA::isResult($contact) && ($contact['dfrn'] == Protocol::DFRN)) {
 551                                         continue;
 552                                 }
 553
 554                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 555                                         if ($contact['hidden'] || $always_bcc) {
 556                                                 $data['bcc'][] = $profile['url'];
 557                                         } else {
 558                                                 $data['cc'][] = $profile['url'];
 559                                         }
 560                                 }
 561                         }
 562                 }
 563
 564                 if (!empty($item['parent'])) {
 565                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 566                         while ($parent = Item::fetch($parents)) {
 567                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 568                                         $profile = APContact::getByURL($parent['owner-link'], false);
 569                                         if (!empty($profile)) {
 570                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 571                                                         // Comments to forums are directed to the forum
 572                                                         // But comments to forums aren't directed to the followers collection
 573                                                         // This rule is only valid when the actor isn't the forum.
 574                                                         // The forum needs to transmit their content to their followers.
 575                                                         if (($profile['type'] == 'Group') && ($profile['url'] != $actor_profile['url'])) {
 576                                                                 $data['to'][] = $profile['url'];
 577                                                         } else {
 578                                                                 $data['cc'][] = $profile['url'];
 579                                                                 if (($item['private'] != Item::PRIVATE) && !empty($actor_profile['followers'])) {
 580                                                                         $data['cc'][] = $actor_profile['followers'];
 581                                                                 }
 582                                                         }
 583                                                 } else {
 584                                                         // Public thread parent post always are directed to the followers
 585                                                         if (($item['private'] != Item::PRIVATE) && !$forum_mode) {
 586                                                                 $data['cc'][] = $actor_profile['followers'];
 587                                                         }
 588                                                 }
 589                                         }
 590                                 }
 591
 592                                 // Don't include data from future posts
 593                                 if ($parent['id'] >= $last_id) {
 594                                         continue;
 595                                 }
 596
 597                                 $profile = APContact::getByURL($parent['author-link'], false);
 598                                 if (!empty($profile)) {
 599                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 600                                                 $data['to'][] = $profile['url'];
 601                                         } else {
 602                                                 $data['cc'][] = $profile['url'];
 603                                         }
 604                                 }
 605                         }
 606                         DBA::close($parents);
 607                 }
 608
 609                 $data['to'] = array_unique($data['to']);
 610                 $data['cc'] = array_unique($data['cc']);
 611                 $data['bcc'] = array_unique($data['bcc']);
 612
 613                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 614                         unset($data['to'][$key]);
 615                 }
 616
 617                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 618                         unset($data['cc'][$key]);
 619                 }
 620
 621                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 622                         unset($data['bcc'][$key]);
 623                 }
 624
 625                 foreach ($data['to'] as $to) {
 626                         if (($key = array_search($to, $data['cc'])) !== false) {
 627                                 unset($data['cc'][$key]);
 628                         }
 629
 630                         if (($key = array_search($to, $data['bcc'])) !== false) {
 631                                 unset($data['bcc'][$key]);
 632                         }
 633                 }
 634
 635                 foreach ($data['cc'] as $cc) {
 636                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 637                                 unset($data['bcc'][$key]);
 638                         }
 639                 }
 640
 641                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 642
 643                 if (!$blindcopy) {
 644                         unset($receivers['bcc']);
 645                 }
 646
 647                 return $receivers;
 648         }
 649
 650         /**
 651          * Check if an inbox is archived
 652          *
 653          * @param string $url Inbox url
 654          *
 655          * @return boolean "true" if inbox is archived
 656          */
 657         private static function archivedInbox($url)
 658         {
 659                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 660         }
 661
 662         /**
 663          * Fetches a list of inboxes of followers of a given user
 664          *
 665          * @param integer $uid      User ID
 666          * @param boolean $personal fetch personal inboxes
 667          *
 668          * @return array of follower inboxes
 669          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 670          * @throws \ImagickException
 671          */
 672         public static function fetchTargetInboxesforUser($uid, $personal = false)
 673         {
 674                 $inboxes = [];
 675
 676                 $isforum = false;
 677
 678                 if (!empty($item['uid'])) {
 679                         $profile = User::getOwnerDataById($item['uid']);
 680                         if (!empty($profile)) {
 681                                 $isforum = $profile['account-type'] == User::ACCOUNT_TYPE_COMMUNITY;
 682                         }
 683                 }
 684
 685                 if (DI::config()->get('debug', 'total_ap_delivery')) {
 686                         // Will be activated in a later step
 687                         $networks = Protocol::FEDERATED;
 688                 } else {
 689                         // For now only send to these contacts:
 690                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 691                 }
 692
 693                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 694
 695                 if (!empty($uid)) {
 696                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 697                 }
 698
 699                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 700                 while ($contact = DBA::fetch($contacts)) {
 701                         if (Contact::isLocal($contact['url'])) {
 702                                 continue;
 703                         }
 704
 705                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 706                                 continue;
 707                         }
 708
 709                         if ($isforum && ($contact['dfrn'] == Protocol::DFRN)) {
 710                                 continue;
 711                         }
 712
 713                         if (Network::isUrlBlocked($contact['url'])) {
 714                                 continue;
 715                         }
 716
 717                         $profile = APContact::getByURL($contact['url'], false);
 718                         if (!empty($profile)) {
 719                                 if (empty($profile['sharedinbox']) || $personal) {
 720                                         $target = $profile['inbox'];
 721                                 } else {
 722                                         $target = $profile['sharedinbox'];
 723                                 }
 724                                 if (!self::archivedInbox($target)) {
 725                                         $inboxes[$target] = $target;
 726                                 }
 727                         }
 728                 }
 729                 DBA::close($contacts);
 730
 731                 return $inboxes;
 732         }
 733
 734         /**
 735          * Fetches an array of inboxes for the given item and user
 736          *
 737          * @param array   $item       Item array
 738          * @param integer $uid        User ID
 739          * @param boolean $personal   fetch personal inboxes
 740          * @param integer $last_id    Last item id for adding receivers
 741          * @param boolean $forum_mode "true" means that we are sending content to a forum
 742          * @return array with inboxes
 743          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 744          * @throws \ImagickException
 745          */
 746         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 747         {
 748                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 749                 if (empty($permissions)) {
 750                         return [];
 751                 }
 752
 753                 $inboxes = [];
 754
 755                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 756                         $item_profile = APContact::getByURL($item['author-link'], false);
 757                 } else {
 758                         $item_profile = APContact::getByURL($item['owner-link'], false);
 759                 }
 760
 761                 if (empty($item_profile)) {
 762                         return [];
 763                 }
 764
 765                 $profile_uid = User::getIdForURL($item_profile['url']);
 766
 767                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 768                         if (empty($permissions[$element])) {
 769                                 continue;
 770                         }
 771
 772                         $blindcopy = in_array($element, ['bto', 'bcc']);
 773
 774                         foreach ($permissions[$element] as $receiver) {
 775                                 if (empty($receiver) || Network::isUrlBlocked($receiver)) {
 776                                         continue;
 777                                 }
 778
 779                                 if ($item_profile && ($receiver == $item_profile['followers']) && ($uid == $profile_uid)) {
 780                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 781                                 } else {
 782                                         if (Contact::isLocal($receiver)) {
 783                                                 continue;
 784                                         }
 785
 786                                         $profile = APContact::getByURL($receiver, false);
 787                                         if (!empty($profile)) {
 788                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 789                                                         $target = $profile['inbox'];
 790                                                 } else {
 791                                                         $target = $profile['sharedinbox'];
 792                                                 }
 793                                                 if (!self::archivedInbox($target)) {
 794                                                         $inboxes[$target] = $target;
 795                                                 }
 796                                         }
 797                                 }
 798                         }
 799                 }
 800
 801                 return $inboxes;
 802         }
 803
 804         /**
 805          * Creates an array in the structure of the item table for a given mail id
 806          *
 807          * @param integer $mail_id
 808          *
 809          * @return array
 810          * @throws \Exception
 811          */
 812         public static function ItemArrayFromMail($mail_id)
 813         {
 814                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 815                 if (!DBA::isResult($mail)) {
 816                         return [];
 817                 }
 818
 819                 $mail['uri-id'] = ItemURI::insert(['uri' => $mail['uri'], 'guid' => $mail['guid']]);
 820
 821                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 822
 823                 // Making the post more compatible for Mastodon by:
 824                 // - Making it a note and not an article (no title)
 825                 // - Moving the title into the "summary" field that is used as a "content warning"
 826                 $mail['body'] = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
 827                 $mail['title'] = '';
 828
 829                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 830                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 831                 $mail['allow_gid'] = '';
 832                 $mail['deny_cid'] = '';
 833                 $mail['deny_gid'] = '';
 834                 $mail['private'] = true;
 835                 $mail['deleted'] = false;
 836                 $mail['edited'] = $mail['created'];
 837                 $mail['plink'] = $mail['uri'];
 838                 $mail['thr-parent'] = $reply['uri'];
 839                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 840
 841                 $mail['event-type'] = '';
 842                 $mail['attach'] = '';
 843
 844                 $mail['parent'] = 0;
 845
 846                 return $mail;
 847         }
 848
 849         /**
 850          * Creates an activity array for a given mail id
 851          *
 852          * @param integer $mail_id
 853          * @param boolean $object_mode Is the activity item is used inside another object?
 854          *
 855          * @return array of activity
 856          * @throws \Exception
 857          */
 858         public static function createActivityFromMail($mail_id, $object_mode = false)
 859         {
 860                 $mail = self::ItemArrayFromMail($mail_id);
 861                 if (empty($mail)) {
 862                         return [];
 863                 }
 864                 $object = self::createNote($mail);
 865
 866                 if (!$object_mode) {
 867                         $data = ['@context' => ActivityPub::CONTEXT];
 868                 } else {
 869                         $data = [];
 870                 }
 871
 872                 $data['id'] = $mail['uri'] . '/Create';
 873                 $data['type'] = 'Create';
 874                 $data['actor'] = $mail['author-link'];
 875                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 876                 $data['instrument'] = self::getService();
 877                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 878
 879                 if (empty($data['to']) && !empty($data['cc'])) {
 880                         $data['to'] = $data['cc'];
 881                 }
 882
 883                 if (empty($data['to']) && !empty($data['bcc'])) {
 884                         $data['to'] = $data['bcc'];
 885                 }
 886
 887                 unset($data['cc']);
 888                 unset($data['bcc']);
 889
 890                 $object['to'] = $data['to'];
 891                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => '']];
 892
 893                 unset($object['cc']);
 894                 unset($object['bcc']);
 895
 896                 $data['directMessage'] = true;
 897
 898                 $data['object'] = $object;
 899
 900                 $owner = User::getOwnerDataById($mail['uid']);
 901
 902                 if (!$object_mode && !empty($owner)) {
 903                         return LDSignature::sign($data, $owner);
 904                 } else {
 905                         return $data;
 906                 }
 907         }
 908
 909         /**
 910          * Returns the activity type of a given item
 911          *
 912          * @param array $item
 913          *
 914          * @return string with activity type
 915          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 916          * @throws \ImagickException
 917          */
 918         private static function getTypeOfItem($item)
 919         {
 920                 $reshared = false;
 921
 922                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 923                 if (strpos($item['body'], "[share") === 0) {
 924                         $announce = self::getAnnounceArray($item);
 925                         $reshared = !empty($announce);
 926                 }
 927
 928                 if ($reshared) {
 929                         $type = 'Announce';
 930                 } elseif ($item['verb'] == Activity::POST) {
 931                         if ($item['created'] == $item['edited']) {
 932                                 $type = 'Create';
 933                         } else {
 934                                 $type = 'Update';
 935                         }
 936                 } elseif ($item['verb'] == Activity::LIKE) {
 937                         $type = 'Like';
 938                 } elseif ($item['verb'] == Activity::DISLIKE) {
 939                         $type = 'Dislike';
 940                 } elseif ($item['verb'] == Activity::ATTEND) {
 941                         $type = 'Accept';
 942                 } elseif ($item['verb'] == Activity::ATTENDNO) {
 943                         $type = 'Reject';
 944                 } elseif ($item['verb'] == Activity::ATTENDMAYBE) {
 945                         $type = 'TentativeAccept';
 946                 } elseif ($item['verb'] == Activity::FOLLOW) {
 947                         $type = 'Follow';
 948                 } elseif ($item['verb'] == Activity::TAG) {
 949                         $type = 'Add';
 950                 } elseif ($item['verb'] == Activity::ANNOUNCE) {
 951                         $type = 'Announce';
 952                 } else {
 953                         $type = '';
 954                 }
 955
 956                 return $type;
 957         }
 958
 959         /**
 960          * Creates the activity or fetches it from the cache
 961          *
 962          * @param integer $item_id
 963          * @param boolean $force Force new cache entry
 964          *
 965          * @return array with the activity
 966          * @throws \Exception
 967          */
 968         public static function createCachedActivityFromItem($item_id, $force = false)
 969         {
 970                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 971
 972                 if (!$force) {
 973                         $data = DI::cache()->get($cachekey);
 974                         if (!is_null($data)) {
 975                                 return $data;
 976                         }
 977                 }
 978
 979                 $data = self::createActivityFromItem($item_id);
 980
 981                 DI::cache()->set($cachekey, $data, Duration::QUARTER_HOUR);
 982                 return $data;
 983         }
 984
 985         /**
 986          * Creates an activity array for a given item id
 987          *
 988          * @param integer $item_id
 989          * @param boolean $object_mode Is the activity item is used inside another object?
 990          *
 991          * @return array of activity
 992          * @throws \Exception
 993          */
 994         public static function createActivityFromItem($item_id, $object_mode = false)
 995         {
 996                 Logger::info('Fetching activity', ['item' => $item_id]);
 997                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 998                 if (!DBA::isResult($item)) {
 999                         return false;
1000                 }
1001
1002                 // In case of a forum post ensure to return the original post if author and forum are on the same machine
1003                 if (!empty($item['forum_mode'])) {
1004                         $author = Contact::getById($item['author-id'], ['nurl']);
1005                         if (!empty($author['nurl'])) {
1006                                 $self = Contact::selectFirst(['uid'], ['nurl' => $author['nurl'], 'self' => true]);
1007                                 if (!empty($self['uid'])) {
1008                                         $item = Item::selectFirst([], ['uri-id' => $item['uri-id'], 'uid' => $self['uid']]);
1009                                 }
1010                         }
1011                 }
1012
1013                 if (empty($type)) {
1014                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
1015                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
1016                         if (DBA::isResult($conversation)) {
1017                                 $data = json_decode($conversation['source'], true);
1018                                 if (!empty($data['type'])) {
1019                                         if (in_array($data['type'], ['Create', 'Update'])) {
1020                                                 if ($object_mode) {
1021                                                         unset($data['@context']);
1022                                                         unset($data['signature']);
1023                                                 }
1024                                                 Logger::info('Return stored conversation', ['item' => $item_id]);
1025                                                 return $data;
1026                                         } elseif (in_array('as:' . $data['type'], Receiver::CONTENT_TYPES)) {
1027                                                 if (!empty($data['@context'])) {
1028                                                         $context = $data['@context'];
1029                                                         unset($data['@context']);
1030                                                 }
1031                                                 unset($data['actor']);
1032                                                 $object = $data;
1033                                         }
1034                                 }
1035                         }
1036
1037                         $type = self::getTypeOfItem($item);
1038                 }
1039
1040                 if (!$object_mode) {
1041                         $data = ['@context' => $context ?? ActivityPub::CONTEXT];
1042
1043                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
1044                                 $type = 'Undo';
1045                         } elseif ($item['deleted']) {
1046                                 $type = 'Delete';
1047                         }
1048                 } else {
1049                         $data = [];
1050                 }
1051
1052                 if (($item['gravity'] == GRAVITY_ACTIVITY) && ($type != 'Undo')) {
1053                         $data['id'] = $item['uri'];
1054                 } else {
1055                         $data['id'] = $item['uri'] . '/' . $type;
1056                 }
1057
1058                 $data['type'] = $type;
1059
1060                 if (($type != 'Announce') || ($item['gravity'] != GRAVITY_PARENT)) {
1061                         $data['actor'] = $item['author-link'];
1062                 } else {
1063                         $data['actor'] = $item['owner-link'];
1064                 }
1065
1066                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1067
1068                 $data['instrument'] = self::getService();
1069
1070                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
1071
1072                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
1073                         $data['object'] = $object ?? self::createNote($item);
1074                 } elseif ($data['type'] == 'Add') {
1075                         $data = self::createAddTag($item, $data);
1076                 } elseif ($data['type'] == 'Announce') {
1077                         if ($item['verb'] == ACTIVITY::ANNOUNCE) {
1078                                 $data['object'] = $item['thr-parent'];
1079                         } else {
1080                                 $data = self::createAnnounce($item, $data);
1081                         }
1082                 } elseif ($data['type'] == 'Follow') {
1083                         $data['object'] = $item['parent-uri'];
1084                 } elseif ($data['type'] == 'Undo') {
1085                         $data['object'] = self::createActivityFromItem($item_id, true);
1086                 } else {
1087                         $data['diaspora:guid'] = $item['guid'];
1088                         if (!empty($item['signed_text'])) {
1089                                 $data['diaspora:like'] = $item['signed_text'];
1090                         }
1091                         $data['object'] = $item['thr-parent'];
1092                 }
1093
1094                 if (!empty($item['contact-uid'])) {
1095                         $uid = $item['contact-uid'];
1096                 } else {
1097                         $uid = $item['uid'];
1098                 }
1099
1100                 $owner = User::getOwnerDataById($uid);
1101
1102                 Logger::info('Fetched activity', ['item' => $item_id, 'uid' => $uid]);
1103
1104                 // We don't sign if we aren't the actor. This is important for relaying content especially for forums
1105                 if (!$object_mode && !empty($owner) && ($data['actor'] == $owner['url'])) {
1106                         return LDSignature::sign($data, $owner);
1107                 } else {
1108                         return $data;
1109                 }
1110
1111                 /// @todo Create "conversation" entry
1112         }
1113
1114         /**
1115          * Creates a location entry for a given item array
1116          *
1117          * @param array $item
1118          *
1119          * @return array with location array
1120          */
1121         private static function createLocation($item)
1122         {
1123                 $location = ['type' => 'Place'];
1124
1125                 if (!empty($item['location'])) {
1126                         $location['name'] = $item['location'];
1127                 }
1128
1129                 $coord = [];
1130
1131                 if (empty($item['coord'])) {
1132                         $coord = Map::getCoordinates($item['location']);
1133                 } else {
1134                         $coords = explode(' ', $item['coord']);
1135                         if (count($coords) == 2) {
1136                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
1137                         }
1138                 }
1139
1140                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
1141                         $location['latitude'] = $coord['lat'];
1142                         $location['longitude'] = $coord['lon'];
1143                 }
1144
1145                 return $location;
1146         }
1147
1148         /**
1149          * Returns a tag array for a given item array
1150          *
1151          * @param array $item
1152          *
1153          * @return array of tags
1154          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1155          */
1156         private static function createTagList($item)
1157         {
1158                 $tags = [];
1159
1160                 $terms = Tag::getByURIId($item['uri-id'], [Tag::HASHTAG, Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1161                 foreach ($terms as $term) {
1162                         if ($term['type'] == Tag::HASHTAG) {
1163                                 $url = DI::baseUrl() . '/search?tag=' . urlencode($term['name']);
1164                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['name']];
1165                         } else {
1166                                 $contact = Contact::getByURL($term['url'], false, ['addr']);
1167                                 if (empty($contact)) {
1168                                         continue;
1169                                 }
1170                                 if (!empty($contact['addr'])) {
1171                                         $mention = '@' . $contact['addr'];
1172                                 } else {
1173                                         $mention = '@' . $term['url'];
1174                                 }
1175
1176                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
1177                         }
1178                 }
1179
1180                 $announce = self::getAnnounceArray($item);
1181                 // Mention the original author upon commented reshares
1182                 if (!empty($announce['comment'])) {
1183                         $tags[] = ['type' => 'Mention', 'href' => $announce['actor']['url'], 'name' => '@' . $announce['actor']['addr']];
1184                 }
1185
1186                 return $tags;
1187         }
1188
1189         /**
1190          * Adds attachment data to the JSON document
1191          *
1192          * @param array  $item Data of the item that is to be posted
1193          * @param string $type Object type
1194          *
1195          * @return array with attachment data
1196          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1197          */
1198         private static function createAttachmentList($item, $type)
1199         {
1200                 $attachments = [];
1201
1202                 // Currently deactivated, since it creates side effects on Mastodon and Pleroma.
1203                 // It will be reactivated, once this cleared.
1204                 /*
1205                 $attach_data = BBCode::getAttachmentData($item['body']);
1206                 if (!empty($attach_data['url'])) {
1207                         $attachment = ['type' => 'Page',
1208                                 'mediaType' => 'text/html',
1209                                 'url' => $attach_data['url']];
1210
1211                         if (!empty($attach_data['title'])) {
1212                                 $attachment['name'] = $attach_data['title'];
1213                         }
1214
1215                         if (!empty($attach_data['description'])) {
1216                                 $attachment['summary'] = $attach_data['description'];
1217                         }
1218
1219                         if (!empty($attach_data['image'])) {
1220                                 $imgdata = Images::getInfoFromURLCached($attach_data['image']);
1221                                 if ($imgdata) {
1222                                         $attachment['icon'] = ['type' => 'Image',
1223                                                 'mediaType' => $imgdata['mime'],
1224                                                 'width' => $imgdata[0],
1225                                                 'height' => $imgdata[1],
1226                                                 'url' => $attach_data['image']];
1227                                 }
1228                         }
1229
1230                         $attachments[] = $attachment;
1231                 }
1232                 */
1233                 $arr = explode('[/attach],', $item['attach']);
1234                 if (count($arr)) {
1235                         foreach ($arr as $r) {
1236                                 $matches = false;
1237                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1238                                 if ($cnt) {
1239                                         $attributes = ['type' => 'Document',
1240                                                         'mediaType' => $matches[3],
1241                                                         'url' => $matches[1],
1242                                                         'name' => null];
1243
1244                                         if (trim($matches[4]) != '') {
1245                                                 $attributes['name'] = trim($matches[4]);
1246                                         }
1247
1248                                         $attachments[] = $attributes;
1249                                 }
1250                         }
1251                 }
1252
1253                 if ($type != 'Note') {
1254                         return $attachments;
1255                 }
1256
1257                 // Simplify image codes
1258                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1259
1260                 // Grab all pictures without alternative descriptions and create attachments out of them
1261                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1262                         foreach ($pictures[1] as $picture) {
1263                                 $imgdata = Images::getInfoFromURLCached($picture);
1264                                 if ($imgdata) {
1265                                         $attachments[] = ['type' => 'Document',
1266                                                 'mediaType' => $imgdata['mime'],
1267                                                 'url' => $picture,
1268                                                 'name' => null];
1269                                 }
1270                         }
1271                 }
1272
1273                 // Grab all pictures with alternative description and create attachments out of them
1274                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
1275                         foreach ($pictures as $picture) {
1276                                 $imgdata = Images::getInfoFromURLCached($picture[1]);
1277                                 if ($imgdata) {
1278                                         $attachments[] = ['type' => 'Document',
1279                                                 'mediaType' => $imgdata['mime'],
1280                                                 'url' => $picture[1],
1281                                                 'name' => $picture[2]];
1282                                 }
1283                         }
1284                 }
1285
1286                 return $attachments;
1287         }
1288
1289         /**
1290          * Callback function to replace a Friendica style mention in a mention that is used on AP
1291          *
1292          * @param array $match Matching values for the callback
1293          * @return string Replaced mention
1294          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1295          */
1296         private static function mentionCallback($match)
1297         {
1298                 if (empty($match[1])) {
1299                         return '';
1300                 }
1301
1302                 $data = Contact::getByURL($match[1], false, ['url', 'nick']);
1303                 if (empty($data['nick'])) {
1304                         return $match[0];
1305                 }
1306
1307                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1308         }
1309
1310         /**
1311          * Remove image elements since they are added as attachment
1312          *
1313          * @param string $body
1314          *
1315          * @return string with removed images
1316          */
1317         private static function removePictures($body)
1318         {
1319                 // Simplify image codes
1320                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1321                 $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
1322
1323                 // Now remove local links
1324                 $body = preg_replace_callback(
1325                         '/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi',
1326                         function ($match) {
1327                                 // We remove the link when it is a link to a local photo page
1328                                 if (Photo::isLocalPage($match[1])) {
1329                                         return '';
1330                                 }
1331                                 // otherwise we just return the link
1332                                 return '[url]' . $match[1] . '[/url]';
1333                         },
1334                         $body
1335                 );
1336
1337                 // Remove all pictures
1338                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '', $body);
1339
1340                 return $body;
1341         }
1342
1343         /**
1344          * Fetches the "context" value for a givem item array from the "conversation" table
1345          *
1346          * @param array $item
1347          *
1348          * @return string with context url
1349          * @throws \Exception
1350          */
1351         private static function fetchContextURLForItem($item)
1352         {
1353                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1354                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1355                         $context_uri = $conversation['conversation-href'];
1356                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1357                         $context_uri = $conversation['conversation-uri'];
1358                 } else {
1359                         $context_uri = $item['parent-uri'] . '#context';
1360                 }
1361                 return $context_uri;
1362         }
1363
1364         /**
1365          * Returns if the post contains sensitive content ("nsfw")
1366          *
1367          * @param integer $uri_id
1368          *
1369          * @return boolean
1370          * @throws \Exception
1371          */
1372         private static function isSensitive($uri_id)
1373         {
1374                 return DBA::exists('tag-view', ['uri-id' => $uri_id, 'name' => 'nsfw']);
1375         }
1376
1377         /**
1378          * Creates event data
1379          *
1380          * @param array $item
1381          *
1382          * @return array with the event data
1383          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1384          */
1385         public static function createEvent($item)
1386         {
1387                 $event = [];
1388                 $event['name'] = $item['event-summary'];
1389                 $event['content'] = BBCode::convert($item['event-desc'], false, BBCode::ACTIVITYPUB);
1390                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1391
1392                 if (!$item['event-nofinish']) {
1393                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1394                 }
1395
1396                 if (!empty($item['event-location'])) {
1397                         $item['location'] = $item['event-location'];
1398                         $event['location'] = self::createLocation($item);
1399                 }
1400
1401                 return $event;
1402         }
1403
1404         /**
1405          * Creates a note/article object array
1406          *
1407          * @param array $item
1408          *
1409          * @return array with the object data
1410          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1411          * @throws \ImagickException
1412          */
1413         public static function createNote($item)
1414         {
1415                 if (empty($item)) {
1416                         return [];
1417                 }
1418
1419                 if ($item['event-type'] == 'event') {
1420                         $type = 'Event';
1421                 } elseif (!empty($item['title'])) {
1422                         $type = 'Article';
1423                 } else {
1424                         $type = 'Note';
1425                 }
1426
1427                 if ($item['deleted']) {
1428                         $type = 'Tombstone';
1429                 }
1430
1431                 $data = [];
1432                 $data['id'] = $item['uri'];
1433                 $data['type'] = $type;
1434
1435                 if ($item['deleted']) {
1436                         return $data;
1437                 }
1438
1439                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1440
1441                 if ($item['uri'] != $item['thr-parent']) {
1442                         $data['inReplyTo'] = $item['thr-parent'];
1443                 } else {
1444                         $data['inReplyTo'] = null;
1445                 }
1446
1447                 $data['diaspora:guid'] = $item['guid'];
1448                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1449
1450                 if ($item['created'] != $item['edited']) {
1451                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1452                 }
1453
1454                 $data['url'] = $item['plink'];
1455                 $data['attributedTo'] = $item['author-link'];
1456                 $data['sensitive'] = self::isSensitive($item['uri-id']);
1457                 $data['context'] = self::fetchContextURLForItem($item);
1458
1459                 if (!empty($item['title'])) {
1460                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1461                 }
1462
1463                 $permission_block = self::createPermissionBlockForItem($item, false);
1464
1465                 $body = $item['body'];
1466
1467                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1468                         $body = self::prependMentions($body, $item['uri-id']);
1469                 }
1470
1471                 if ($type == 'Note') {
1472                         $body = self::removePictures($body);
1473                 } elseif (($type == 'Article') && empty($data['summary'])) {
1474                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1475                 }
1476
1477                 if ($type == 'Event') {
1478                         $data = array_merge($data, self::createEvent($item));
1479                 } else {
1480                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1481                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1482
1483                         $data['content'] = BBCode::convert($body, false, BBCode::ACTIVITYPUB);
1484                 }
1485
1486                 // The regular "content" field does contain a minimized HTML. This is done since systems like
1487                 // Mastodon has got problems with - for example - embedded pictures.
1488                 // The contentMap does contain the unmodified HTML.
1489                 $language = self::getLanguage($item);
1490                 if (!empty($language)) {
1491                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1492                         $richbody = preg_replace_callback($regexp, ['self', 'mentionCallback'], $item['body']);
1493                         $richbody = BBCode::removeAttachment($richbody);
1494
1495                         $data['contentMap'][$language] = BBCode::convert($richbody, false);
1496                 }
1497
1498                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1499
1500                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1501                         $data['diaspora:comment'] = $item['signed_text'];
1502                 }
1503
1504                 $data['attachment'] = self::createAttachmentList($item, $type);
1505                 $data['tag'] = self::createTagList($item);
1506
1507                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1508                         $data['location'] = self::createLocation($item);
1509                 }
1510
1511                 if (!empty($item['app'])) {
1512                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1513                 }
1514
1515                 $data = array_merge($data, $permission_block);
1516
1517                 return $data;
1518         }
1519
1520         /**
1521          * Fetches the language from the post, the user or the system.
1522          *
1523          * @param array $item
1524          *
1525          * @return string language string
1526          */
1527         private static function getLanguage(array $item)
1528         {
1529                 // Try to fetch the language from the post itself
1530                 if (!empty($item['language'])) {
1531                         $languages = array_keys(json_decode($item['language'], true));
1532                         if (!empty($languages[0])) {
1533                                 return $languages[0];
1534                         }
1535                 }
1536
1537                 // Otherwise use the user's language
1538                 if (!empty($item['uid'])) {
1539                         $user = DBA::selectFirst('user', ['language'], ['uid' => $item['uid']]);
1540                         if (!empty($user['language'])) {
1541                                 return $user['language'];
1542                         }
1543                 }
1544
1545                 // And finally just use the system language
1546                 return DI::config()->get('system', 'language');
1547         }
1548
1549         /**
1550          * Creates an an "add tag" entry
1551          *
1552          * @param array $item
1553          * @param array $data activity data
1554          *
1555          * @return array with activity data for adding tags
1556          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1557          * @throws \ImagickException
1558          */
1559         private static function createAddTag($item, $data)
1560         {
1561                 $object = XML::parseString($item['object']);
1562                 $target = XML::parseString($item["target"]);
1563
1564                 $data['diaspora:guid'] = $item['guid'];
1565                 $data['actor'] = $item['author-link'];
1566                 $data['target'] = (string)$target->id;
1567                 $data['summary'] = BBCode::toPlaintext($item['body']);
1568                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1569
1570                 return $data;
1571         }
1572
1573         /**
1574          * Creates an announce object entry
1575          *
1576          * @param array $item
1577          * @param array $data activity data
1578          *
1579          * @return array with activity data
1580          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1581          * @throws \ImagickException
1582          */
1583         private static function createAnnounce($item, $data)
1584         {
1585                 $orig_body = $item['body'];
1586                 $announce = self::getAnnounceArray($item);
1587                 if (empty($announce)) {
1588                         $data['type'] = 'Create';
1589                         $data['object'] = self::createNote($item);
1590                         return $data;
1591                 }
1592
1593                 if (empty($announce['comment'])) {
1594                         // Pure announce, without a quote
1595                         $data['type'] = 'Announce';
1596                         $data['object'] = $announce['object']['uri'];
1597                         return $data;
1598                 }
1599
1600                 // Quote
1601                 $data['type'] = 'Create';
1602                 $item['body'] = $announce['comment'] . "\n" . $announce['object']['plink'];
1603                 $data['object'] = self::createNote($item);
1604
1605                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1606                 $data['object']['attachment'][] = self::createNote($announce['object']);
1607
1608                 $data['object']['source']['content'] = $orig_body;
1609                 return $data;
1610         }
1611
1612         /**
1613          * Return announce related data if the item is an annunce
1614          *
1615          * @param array $item
1616          *
1617          * @return array
1618          */
1619         public static function getAnnounceArray($item)
1620         {
1621                 $reshared = Item::getShareArray($item);
1622                 if (empty($reshared['guid'])) {
1623                         return [];
1624                 }
1625
1626                 $reshared_item = Item::selectFirst([], ['guid' => $reshared['guid']]);
1627                 if (!DBA::isResult($reshared_item)) {
1628                         return [];
1629                 }
1630
1631                 if (!in_array($reshared_item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1632                         return [];
1633                 }
1634
1635                 $profile = APContact::getByURL($reshared_item['author-link'], false);
1636                 if (empty($profile)) {
1637                         return [];
1638                 }
1639
1640                 return ['object' => $reshared_item, 'actor' => $profile, 'comment' => $reshared['comment']];
1641         }
1642
1643         /**
1644          * Checks if the provided item array is an announce
1645          *
1646          * @param array $item
1647          *
1648          * @return boolean
1649          */
1650         public static function isAnnounce($item)
1651         {
1652                 if (!empty($item['verb']) && ($item['verb'] == Activity::ANNOUNCE)) {
1653                         return true;
1654                 }
1655
1656                 $announce = self::getAnnounceArray($item);
1657                 if (empty($announce)) {
1658                         return false;
1659                 }
1660
1661                 return empty($announce['comment']);
1662         }
1663
1664         /**
1665          * Creates an activity id for a given contact id
1666          *
1667          * @param integer $cid Contact ID of target
1668          *
1669          * @return bool|string activity id
1670          */
1671         public static function activityIDFromContact($cid)
1672         {
1673                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1674                 if (!DBA::isResult($contact)) {
1675                         return false;
1676                 }
1677
1678                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1679                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1680                 return DI::baseUrl() . '/activity/' . $uuid;
1681         }
1682
1683         /**
1684          * Transmits a contact suggestion to a given inbox
1685          *
1686          * @param integer $uid           User ID
1687          * @param string  $inbox         Target inbox
1688          * @param integer $suggestion_id Suggestion ID
1689          *
1690          * @return boolean was the transmission successful?
1691          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1692          */
1693         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1694         {
1695                 $owner = User::getOwnerDataById($uid);
1696
1697                 $suggestion = DI::fsuggest()->getById($suggestion_id);
1698
1699                 $data = ['@context' => ActivityPub::CONTEXT,
1700                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1701                         'type' => 'Announce',
1702                         'actor' => $owner['url'],
1703                         'object' => $suggestion->url,
1704                         'content' => $suggestion->note,
1705                         'instrument' => self::getService(),
1706                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1707                         'cc' => []];
1708
1709                 $signed = LDSignature::sign($data, $owner);
1710
1711                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1712                 return HTTPSignature::transmit($signed, $inbox, $uid);
1713         }
1714
1715         /**
1716          * Transmits a profile relocation to a given inbox
1717          *
1718          * @param integer $uid   User ID
1719          * @param string  $inbox Target inbox
1720          *
1721          * @return boolean was the transmission successful?
1722          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1723          */
1724         public static function sendProfileRelocation($uid, $inbox)
1725         {
1726                 $owner = User::getOwnerDataById($uid);
1727
1728                 $data = ['@context' => ActivityPub::CONTEXT,
1729                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1730                         'type' => 'dfrn:relocate',
1731                         'actor' => $owner['url'],
1732                         'object' => $owner['url'],
1733                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1734                         'instrument' => self::getService(),
1735                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1736                         'cc' => []];
1737
1738                 $signed = LDSignature::sign($data, $owner);
1739
1740                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1741                 return HTTPSignature::transmit($signed, $inbox, $uid);
1742         }
1743
1744         /**
1745          * Transmits a profile deletion to a given inbox
1746          *
1747          * @param integer $uid   User ID
1748          * @param string  $inbox Target inbox
1749          *
1750          * @return boolean was the transmission successful?
1751          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1752          */
1753         public static function sendProfileDeletion($uid, $inbox)
1754         {
1755                 $owner = User::getOwnerDataById($uid);
1756
1757                 if (empty($owner)) {
1758                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1759                         return false;
1760                 }
1761
1762                 if (empty($owner['uprvkey'])) {
1763                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1764                         return false;
1765                 }
1766
1767                 $data = ['@context' => ActivityPub::CONTEXT,
1768                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1769                         'type' => 'Delete',
1770                         'actor' => $owner['url'],
1771                         'object' => $owner['url'],
1772                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1773                         'instrument' => self::getService(),
1774                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1775                         'cc' => []];
1776
1777                 $signed = LDSignature::sign($data, $owner);
1778
1779                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1780                 return HTTPSignature::transmit($signed, $inbox, $uid);
1781         }
1782
1783         /**
1784          * Transmits a profile change to a given inbox
1785          *
1786          * @param integer $uid   User ID
1787          * @param string  $inbox Target inbox
1788          *
1789          * @return boolean was the transmission successful?
1790          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1791          * @throws \ImagickException
1792          */
1793         public static function sendProfileUpdate($uid, $inbox)
1794         {
1795                 $owner = User::getOwnerDataById($uid);
1796                 $profile = APContact::getByURL($owner['url']);
1797
1798                 $data = ['@context' => ActivityPub::CONTEXT,
1799                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1800                         'type' => 'Update',
1801                         'actor' => $owner['url'],
1802                         'object' => self::getProfile($uid),
1803                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1804                         'instrument' => self::getService(),
1805                         'to' => [$profile['followers']],
1806                         'cc' => []];
1807
1808                 $signed = LDSignature::sign($data, $owner);
1809
1810                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1811                 return HTTPSignature::transmit($signed, $inbox, $uid);
1812         }
1813
1814         /**
1815          * Transmits a given activity to a target
1816          *
1817          * @param string  $activity Type name
1818          * @param string  $target   Target profile
1819          * @param integer $uid      User ID
1820          * @return bool
1821          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1822          * @throws \ImagickException
1823          * @throws \Exception
1824          */
1825         public static function sendActivity($activity, $target, $uid, $id = '')
1826         {
1827                 $profile = APContact::getByURL($target);
1828                 if (empty($profile['inbox'])) {
1829                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1830                         return;
1831                 }
1832
1833                 $owner = User::getOwnerDataById($uid);
1834
1835                 if (empty($id)) {
1836                         $id = DI::baseUrl() . '/activity/' . System::createGUID();
1837                 }
1838
1839                 $data = ['@context' => ActivityPub::CONTEXT,
1840                         'id' => $id,
1841                         'type' => $activity,
1842                         'actor' => $owner['url'],
1843                         'object' => $profile['url'],
1844                         'instrument' => self::getService(),
1845                         'to' => [$profile['url']]];
1846
1847                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1848
1849                 $signed = LDSignature::sign($data, $owner);
1850                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1851         }
1852
1853         /**
1854          * Transmits a "follow object" activity to a target
1855          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1856          *
1857          * @param string  $object Object URL
1858          * @param string  $target Target profile
1859          * @param integer $uid    User ID
1860          * @return bool
1861          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1862          * @throws \ImagickException
1863          * @throws \Exception
1864          */
1865         public static function sendFollowObject($object, $target, $uid = 0)
1866         {
1867                 $profile = APContact::getByURL($target);
1868                 if (empty($profile['inbox'])) {
1869                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1870                         return;
1871                 }
1872
1873                 if (empty($uid)) {
1874                         // Fetch the list of administrators
1875                         $admin_mail = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
1876
1877                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1878                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1879                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1880                         $uid = $first_user['uid'];
1881                 }
1882
1883                 $condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1884                         'author-id' => Contact::getPublicIdByUserId($uid)];
1885                 if (Item::exists($condition)) {
1886                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1887                         return false;
1888                 }
1889
1890                 $owner = User::getOwnerDataById($uid);
1891
1892                 $data = ['@context' => ActivityPub::CONTEXT,
1893                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1894                         'type' => 'Follow',
1895                         'actor' => $owner['url'],
1896                         'object' => $object,
1897                         'instrument' => self::getService(),
1898                         'to' => [$profile['url']]];
1899
1900                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1901
1902                 $signed = LDSignature::sign($data, $owner);
1903                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1904         }
1905
1906         /**
1907          * Transmit a message that the contact request had been accepted
1908          *
1909          * @param string  $target Target profile
1910          * @param         $id
1911          * @param integer $uid    User ID
1912          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1913          * @throws \ImagickException
1914          */
1915         public static function sendContactAccept($target, $id, $uid)
1916         {
1917                 $profile = APContact::getByURL($target);
1918                 if (empty($profile['inbox'])) {
1919                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1920                         return;
1921                 }
1922
1923                 $owner = User::getOwnerDataById($uid);
1924                 $data = ['@context' => ActivityPub::CONTEXT,
1925                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1926                         'type' => 'Accept',
1927                         'actor' => $owner['url'],
1928                         'object' => [
1929                                 'id' => (string)$id,
1930                                 'type' => 'Follow',
1931                                 'actor' => $profile['url'],
1932                                 'object' => $owner['url']
1933                         ],
1934                         'instrument' => self::getService(),
1935                         'to' => [$profile['url']]];
1936
1937                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1938
1939                 $signed = LDSignature::sign($data, $owner);
1940                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1941         }
1942
1943         /**
1944          * Reject a contact request or terminates the contact relation
1945          *
1946          * @param string  $target Target profile
1947          * @param         $id
1948          * @param integer $uid    User ID
1949          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1950          * @throws \ImagickException
1951          */
1952         public static function sendContactReject($target, $id, $uid)
1953         {
1954                 $profile = APContact::getByURL($target);
1955                 if (empty($profile['inbox'])) {
1956                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1957                         return;
1958                 }
1959
1960                 $owner = User::getOwnerDataById($uid);
1961                 $data = ['@context' => ActivityPub::CONTEXT,
1962                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1963                         'type' => 'Reject',
1964                         'actor' => $owner['url'],
1965                         'object' => [
1966                                 'id' => (string)$id,
1967                                 'type' => 'Follow',
1968                                 'actor' => $profile['url'],
1969                                 'object' => $owner['url']
1970                         ],
1971                         'instrument' => self::getService(),
1972                         'to' => [$profile['url']]];
1973
1974                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1975
1976                 $signed = LDSignature::sign($data, $owner);
1977                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1978         }
1979
1980         /**
1981          * Transmits a message that we don't want to follow this contact anymore
1982          *
1983          * @param string  $target Target profile
1984          * @param integer $uid    User ID
1985          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1986          * @throws \ImagickException
1987          * @throws \Exception
1988          * @return bool success
1989          */
1990         public static function sendContactUndo($target, $cid, $uid)
1991         {
1992                 $profile = APContact::getByURL($target);
1993                 if (empty($profile['inbox'])) {
1994                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1995                         return false;
1996                 }
1997
1998                 $object_id = self::activityIDFromContact($cid);
1999                 if (empty($object_id)) {
2000                         return false;
2001                 }
2002
2003                 $id = DI::baseUrl() . '/activity/' . System::createGUID();
2004
2005                 $owner = User::getOwnerDataById($uid);
2006                 $data = ['@context' => ActivityPub::CONTEXT,
2007                         'id' => $id,
2008                         'type' => 'Undo',
2009                         'actor' => $owner['url'],
2010                         'object' => ['id' => $object_id, 'type' => 'Follow',
2011                                 'actor' => $owner['url'],
2012                                 'object' => $profile['url']],
2013                         'instrument' => self::getService(),
2014                         'to' => [$profile['url']]];
2015
2016                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
2017
2018                 $signed = LDSignature::sign($data, $owner);
2019                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
2020         }
2021
2022         private static function prependMentions($body, int $uriid)
2023         {
2024                 $mentions = [];
2025
2026                 foreach (Tag::getByURIId($uriid, [Tag::IMPLICIT_MENTION]) as $tag) {
2027                         $profile = Contact::getByURL($tag['url'], false, ['addr', 'contact-type', 'nick']);
2028                         if (!empty($profile['addr'])
2029                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
2030                                 && !strstr($body, $profile['addr'])
2031                                 && !strstr($body, $tag['url'])
2032                         ) {
2033                                 $mentions[] = '@[url=' . $tag['url'] . ']' . $profile['nick'] . '[/url]';
2034                         }
2035                 }
2036
2037                 $mentions[] = $body;
2038
2039                 return implode(' ', $mentions);
2040         }
2041 }