src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @file src/Protocol/ActivityPub/Transmitter.php
   4  */
   5 namespace Friendica\Protocol\ActivityPub;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Content\Feature;
   9 use Friendica\Database\DBA;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\Logger;
  12 use Friendica\Core\System;
  13 use Friendica\Util\HTTPSignature;
  14 use Friendica\Core\Protocol;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Contact;
  17 use Friendica\Model\APContact;
  18 use Friendica\Model\Item;
  19 use Friendica\Model\Term;
  20 use Friendica\Model\User;
  21 use Friendica\Util\DateTimeFormat;
  22 use Friendica\Content\Text\BBCode;
  23 use Friendica\Content\Text\Plaintext;
  24 use Friendica\Util\JsonLD;
  25 use Friendica\Util\LDSignature;
  26 use Friendica\Model\Profile;
  27 use Friendica\Object\Image;
  28 use Friendica\Protocol\ActivityPub;
  29 use Friendica\Core\Cache;
  30 use Friendica\Util\Map;
  31 use Friendica\Util\Network;
  32
  33 require_once 'include/api.php';
  34 require_once 'mod/share.php';
  35
  36 /**
  37  * @brief ActivityPub Transmitter Protocol class
  38  *
  39  * To-Do:
  40  * - Undo Announce
  41  */
  42 class Transmitter
  43 {
  44         /**
  45          * collects the lost of followers of the given owner
  46          *
  47          * @param array   $owner Owner array
  48          * @param integer $page  Page number
  49          *
  50          * @return array of owners
  51          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  52          */
  53         public static function getFollowers($owner, $page = null)
  54         {
  55                 $condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
  56                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
  57                 $count = DBA::count('contact', $condition);
  58
  59                 $data = ['@context' => ActivityPub::CONTEXT];
  60                 $data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  61                 $data['type'] = 'OrderedCollection';
  62                 $data['totalItems'] = $count;
  63
  64                 // When we hide our friends we will only show the pure number but don't allow more.
  65                 $profile = Profile::getByUID($owner['uid']);
  66                 if (!empty($profile['hide-friends'])) {
  67                         return $data;
  68                 }
  69
  70                 if (empty($page)) {
  71                         $data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
  72                 } else {
  73                         $list = [];
  74
  75                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
  76                         while ($contact = DBA::fetch($contacts)) {
  77                                 $list[] = $contact['url'];
  78                         }
  79
  80                         if (!empty($list)) {
  81                                 $data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
  82                         }
  83
  84                         $data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
  85
  86                         $data['orderedItems'] = $list;
  87                 }
  88
  89                 return $data;
  90         }
  91
  92         /**
  93          * Create list of following contacts
  94          *
  95          * @param array   $owner Owner array
  96          * @param integer $page  Page numbe
  97          *
  98          * @return array of following contacts
  99          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 100          */
 101         public static function getFollowing($owner, $page = null)
 102         {
 103                 $condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
 104                         'self' => false, 'deleted' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
 105                 $count = DBA::count('contact', $condition);
 106
 107                 $data = ['@context' => ActivityPub::CONTEXT];
 108                 $data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
 109                 $data['type'] = 'OrderedCollection';
 110                 $data['totalItems'] = $count;
 111
 112                 // When we hide our friends we will only show the pure number but don't allow more.
 113                 $profile = Profile::getByUID($owner['uid']);
 114                 if (!empty($profile['hide-friends'])) {
 115                         return $data;
 116                 }
 117
 118                 if (empty($page)) {
 119                         $data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
 120                 } else {
 121                         $list = [];
 122
 123                         $contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
 124                         while ($contact = DBA::fetch($contacts)) {
 125                                 $list[] = $contact['url'];
 126                         }
 127
 128                         if (!empty($list)) {
 129                                 $data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
 130                         }
 131
 132                         $data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
 133
 134                         $data['orderedItems'] = $list;
 135                 }
 136
 137                 return $data;
 138         }
 139
 140         /**
 141          * Public posts for the given owner
 142          *
 143          * @param array   $owner Owner array
 144          * @param integer $page  Page numbe
 145          *
 146          * @return array of posts
 147          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 148          * @throws \ImagickException
 149          */
 150         public static function getOutbox($owner, $page = null)
 151         {
 152                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 153
 154                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 155                         'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 156                         'deleted' => false, 'visible' => true, 'moderated' => false];
 157                 $count = DBA::count('item', $condition);
 158
 159                 $data = ['@context' => ActivityPub::CONTEXT];
 160                 $data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 161                 $data['type'] = 'OrderedCollection';
 162                 $data['totalItems'] = $count;
 163
 164                 if (empty($page)) {
 165                         $data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 166                 } else {
 167                         $list = [];
 168
 169                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 170
 171                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 172                         while ($item = Item::fetch($items)) {
 173                                 $object = self::createObjectFromItemID($item['id']);
 174                                 unset($object['@context']);
 175                                 $list[] = $object;
 176                         }
 177
 178                         if (!empty($list)) {
 179                                 $data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 180                         }
 181
 182                         $data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
 183
 184                         $data['orderedItems'] = $list;
 185                 }
 186
 187                 return $data;
 188         }
 189
 190         /**
 191          * Return the ActivityPub profile of the given user
 192          *
 193          * @param integer $uid User ID
 194          * @return array with profile data
 195          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 196          */
 197         public static function getProfile($uid)
 198         {
 199                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 200                         'account_removed' => false, 'verified' => true];
 201                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 202                 $user = DBA::selectFirst('user', $fields, $condition);
 203                 if (!DBA::isResult($user)) {
 204                         return [];
 205                 }
 206
 207                 $fields = ['locality', 'region', 'country-name'];
 208                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
 209                 if (!DBA::isResult($profile)) {
 210                         return [];
 211                 }
 212
 213                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 214                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 215                 if (!DBA::isResult($contact)) {
 216                         return [];
 217                 }
 218
 219                 // On old installations and never changed contacts this might not be filled
 220                 if (empty($contact['avatar'])) {
 221                         $contact['avatar'] = $contact['photo'];
 222                 }
 223
 224                 $data = ['@context' => ActivityPub::CONTEXT];
 225                 $data['id'] = $contact['url'];
 226                 $data['diaspora:guid'] = $user['guid'];
 227                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 228                 $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
 229                 $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
 230                 $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
 231                 $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
 232                 $data['preferredUsername'] = $user['nickname'];
 233                 $data['name'] = $contact['name'];
 234                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 235                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 236                 $data['summary'] = $contact['about'];
 237                 $data['url'] = $contact['url'];
 238                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 239                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 240                         'owner' => $contact['url'],
 241                         'publicKeyPem' => $user['pubkey']];
 242                 $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
 243                 $data['icon'] = ['type' => 'Image',
 244                         'url' => $contact['avatar']];
 245
 246                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 247                 return $data;
 248         }
 249
 250         /**
 251          * Returns an array with permissions of a given item array
 252          *
 253          * @param array $item
 254          *
 255          * @return array with permissions
 256          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 257          * @throws \ImagickException
 258          */
 259         private static function fetchPermissionBlockFromConversation($item)
 260         {
 261                 if (empty($item['thr-parent'])) {
 262                         return [];
 263                 }
 264
 265                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 266                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 267                 if (!DBA::isResult($conversation)) {
 268                         return [];
 269                 }
 270
 271                 $activity = json_decode($conversation['source'], true);
 272
 273                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 274                 $profile = APContact::getByURL($actor);
 275
 276                 $item_profile = APContact::getByURL($item['author-link']);
 277                 $exclude[] = $item['author-link'];
 278
 279                 if ($item['gravity'] == GRAVITY_PARENT) {
 280                         $exclude[] = $item['owner-link'];
 281                 }
 282
 283                 $permissions['to'][] = $actor;
 284
 285                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 286                         if (empty($activity[$element])) {
 287                                 continue;
 288                         }
 289                         if (is_string($activity[$element])) {
 290                                 $activity[$element] = [$activity[$element]];
 291                         }
 292
 293                         foreach ($activity[$element] as $receiver) {
 294                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 295                                         $permissions[$element][] = $item_profile['followers'];
 296                                 } elseif (!in_array($receiver, $exclude)) {
 297                                         $permissions[$element][] = $receiver;
 298                                 }
 299                         }
 300                 }
 301                 return $permissions;
 302         }
 303
 304         /**
 305          * Creates an array of permissions from an item thread
 306          *
 307          * @param array   $item       Item array
 308          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 309          * @param integer $last_id    Last item id for adding receivers
 310          * @param boolean $forum_mode "true" means that we are sending content to a forum
 311          *
 312          * @return array with permission data
 313          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 314          * @throws \ImagickException
 315          */
 316         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 317         {
 318                 if ($last_id == 0) {
 319                         $last_id = $item['id'];
 320                 }
 321
 322                 $always_bcc = false;
 323
 324                 // Check if we should always deliver our stuff via BCC
 325                 if (!empty($item['uid'])) {
 326                         $profile = Profile::getByUID($item['uid']);
 327                         if (!empty($profile)) {
 328                                 $always_bcc = $profile['hide-friends'];
 329                         }
 330                 }
 331
 332                 if (Config::get('debug', 'total_ap_delivery')) {
 333                         // Will be activated in a later step
 334                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 335                 } else {
 336                         // For now only send to these contacts:
 337                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 338                 }
 339
 340                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 341
 342                 if ($item['gravity'] == GRAVITY_PARENT) {
 343                         $actor_profile = APContact::getByURL($item['owner-link']);
 344                 } else {
 345                         $actor_profile = APContact::getByURL($item['author-link']);
 346                 }
 347
 348                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 349
 350                 if (!$item['private']) {
 351                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 352
 353                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 354
 355                         foreach ($terms as $term) {
 356                                 $profile = APContact::getByURL($term['url'], false);
 357                                 if (!empty($profile)) {
 358                                         $data['to'][] = $profile['url'];
 359                                 }
 360                         }
 361                 } else {
 362                         $receiver_list = Item::enumeratePermissions($item);
 363
 364                         foreach ($terms as $term) {
 365                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 366                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 367                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 368                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 369                                                 $data['to'][] = $profile['url'];
 370                                         }
 371                                 }
 372                         }
 373
 374                         foreach ($receiver_list as $receiver) {
 375                                 $contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
 376                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 377                                         if ($contact['hidden'] || $always_bcc) {
 378                                                 $data['bcc'][] = $profile['url'];
 379                                         } else {
 380                                                 $data['cc'][] = $profile['url'];
 381                                         }
 382                                 }
 383                         }
 384                 }
 385
 386                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 387                 while ($parent = Item::fetch($parents)) {
 388                         if ($parent['gravity'] == GRAVITY_PARENT) {
 389                                 $profile = APContact::getByURL($parent['owner-link'], false);
 390                                 if (!empty($profile)) {
 391                                         if ($item['gravity'] != GRAVITY_PARENT) {
 392                                                 // Comments to forums are directed to the forum
 393                                                 // But comments to forums aren't directed to the followers collection
 394                                                 if ($profile['type'] == 'Group') {
 395                                                         $data['to'][] = $profile['url'];
 396                                                 } else {
 397                                                         $data['cc'][] = $profile['url'];
 398                                                         if (!$item['private']) {
 399                                                                 $data['cc'][] = $actor_profile['followers'];
 400                                                         }
 401                                                 }
 402                                         } else {
 403                                                 // Public thread parent post always are directed to the followes
 404                                                 if (!$item['private'] && !$forum_mode) {
 405                                                         $data['cc'][] = $actor_profile['followers'];
 406                                                 }
 407                                         }
 408                                 }
 409                         }
 410
 411                         // Don't include data from future posts
 412                         if ($parent['id'] >= $last_id) {
 413                                 continue;
 414                         }
 415
 416                         $profile = APContact::getByURL($parent['author-link'], false);
 417                         if (!empty($profile)) {
 418                                 if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 419                                         $data['to'][] = $profile['url'];
 420                                 } else {
 421                                         $data['cc'][] = $profile['url'];
 422                                 }
 423                         }
 424                 }
 425                 DBA::close($parents);
 426
 427                 $data['to'] = array_unique($data['to']);
 428                 $data['cc'] = array_unique($data['cc']);
 429                 $data['bcc'] = array_unique($data['bcc']);
 430
 431                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 432                         unset($data['to'][$key]);
 433                 }
 434
 435                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 436                         unset($data['cc'][$key]);
 437                 }
 438
 439                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 440                         unset($data['bcc'][$key]);
 441                 }
 442
 443                 foreach ($data['to'] as $to) {
 444                         if (($key = array_search($to, $data['cc'])) !== false) {
 445                                 unset($data['cc'][$key]);
 446                         }
 447
 448                         if (($key = array_search($to, $data['bcc'])) !== false) {
 449                                 unset($data['bcc'][$key]);
 450                         }
 451                 }
 452
 453                 foreach ($data['cc'] as $cc) {
 454                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 455                                 unset($data['bcc'][$key]);
 456                         }
 457                 }
 458
 459                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 460
 461                 if (!$blindcopy) {
 462                         unset($receivers['bcc']);
 463                 }
 464
 465                 return $receivers;
 466         }
 467
 468         /**
 469          * Fetches a list of inboxes of followers of a given user
 470          *
 471          * @param integer $uid      User ID
 472          * @param boolean $personal fetch personal inboxes
 473          *
 474          * @return array of follower inboxes
 475          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 476          * @throws \ImagickException
 477          */
 478         public static function fetchTargetInboxesforUser($uid, $personal = false)
 479         {
 480                 $inboxes = [];
 481
 482                 if (Config::get('debug', 'total_ap_delivery')) {
 483                         // Will be activated in a later step
 484                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 485                 } else {
 486                         // For now only send to these contacts:
 487                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 488                 }
 489
 490                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 491
 492                 if (!empty($uid)) {
 493                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 494                 }
 495
 496                 $contacts = DBA::select('contact', ['url'], $condition);
 497                 while ($contact = DBA::fetch($contacts)) {
 498                         if (Network::isUrlBlocked($contact['url'])) {
 499                                 continue;
 500                         }
 501
 502                         $profile = APContact::getByURL($contact['url'], false);
 503                         if (!empty($profile)) {
 504                                 if (empty($profile['sharedinbox']) || $personal) {
 505                                         $target = $profile['inbox'];
 506                                 } else {
 507                                         $target = $profile['sharedinbox'];
 508                                 }
 509                                 $inboxes[$target] = $target;
 510                         }
 511                 }
 512                 DBA::close($contacts);
 513
 514                 return $inboxes;
 515         }
 516
 517         /**
 518          * Fetches an array of inboxes for the given item and user
 519          *
 520          * @param array   $item       Item array
 521          * @param integer $uid        User ID
 522          * @param boolean $personal   fetch personal inboxes
 523          * @param integer $last_id    Last item id for adding receivers
 524          * @param boolean $forum_mode "true" means that we are sending content to a forum
 525          * @return array with inboxes
 526          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 527          * @throws \ImagickException
 528          */
 529         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 530         {
 531                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 532                 if (empty($permissions)) {
 533                         return [];
 534                 }
 535
 536                 $inboxes = [];
 537
 538                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 539                         $item_profile = APContact::getByURL($item['author-link'], false);
 540                 } else {
 541                         $item_profile = APContact::getByURL($item['owner-link'], false);
 542                 }
 543
 544                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 545                         if (empty($permissions[$element])) {
 546                                 continue;
 547                         }
 548
 549                         $blindcopy = in_array($element, ['bto', 'bcc']);
 550
 551                         foreach ($permissions[$element] as $receiver) {
 552                                 if (Network::isUrlBlocked($receiver)) {
 553                                         continue;
 554                                 }
 555
 556                                 if ($receiver == $item_profile['followers']) {
 557                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 558                                 } else {
 559                                         $profile = APContact::getByURL($receiver, false);
 560                                         if (!empty($profile)) {
 561                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 562                                                         $target = $profile['inbox'];
 563                                                 } else {
 564                                                         $target = $profile['sharedinbox'];
 565                                                 }
 566                                                 $inboxes[$target] = $target;
 567                                         }
 568                                 }
 569                         }
 570                 }
 571
 572                 return $inboxes;
 573         }
 574
 575         /**
 576          * Returns the activity type of a given item
 577          *
 578          * @param array $item
 579          *
 580          * @return string with activity type
 581          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 582          * @throws \ImagickException
 583          */
 584         private static function getTypeOfItem($item)
 585         {
 586                 $reshared = false;
 587
 588                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 589                 if (strpos($item['body'], "[share") === 0) {
 590                         $announce = api_share_as_retweet($item);
 591                         $reshared = !empty($announce['plink']);
 592                 }
 593
 594                 if ($reshared) {
 595                         $type = 'Announce';
 596                 } elseif ($item['verb'] == ACTIVITY_POST) {
 597                         if ($item['created'] == $item['edited']) {
 598                                 $type = 'Create';
 599                         } else {
 600                                 $type = 'Update';
 601                         }
 602                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 603                         $type = 'Like';
 604                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 605                         $type = 'Dislike';
 606                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 607                         $type = 'Accept';
 608                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 609                         $type = 'Reject';
 610                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 611                         $type = 'TentativeAccept';
 612                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 613                         $type = 'Follow';
 614                 } else {
 615                         $type = '';
 616                 }
 617
 618                 return $type;
 619         }
 620
 621         /**
 622          * Creates the activity or fetches it from the cache
 623          *
 624          * @param integer $item_id
 625          * @param boolean $force Force new cache entry
 626          *
 627          * @return array with the activity
 628          * @throws \Exception
 629          */
 630         public static function createCachedActivityFromItem($item_id, $force = false)
 631         {
 632                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 633
 634                 if (!$force) {
 635                         $data = Cache::get($cachekey);
 636                         if (!is_null($data)) {
 637                                 return $data;
 638                         }
 639                 }
 640
 641                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 642
 643                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 644                 return $data;
 645         }
 646
 647         /**
 648          * Creates an activity array for a given item id
 649          *
 650          * @param integer $item_id
 651          * @param boolean $object_mode Is the activity item is used inside another object?
 652          *
 653          * @return array of activity
 654          * @throws \Exception
 655          */
 656         public static function createActivityFromItem($item_id, $object_mode = false)
 657         {
 658                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 659
 660                 if (!DBA::isResult($item)) {
 661                         return false;
 662                 }
 663
 664                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 665                         $owner = User::getOwnerDataById($item['uid']);
 666                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 667                                 $type = 'Announce';
 668
 669                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 670                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 671                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 672                         }
 673                 }
 674
 675                 if (empty($type)) {
 676                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 677                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 678                         if (DBA::isResult($conversation)) {
 679                                 $data = json_decode($conversation['source']);
 680                                 if (!empty($data)) {
 681                                         return $data;
 682                                 }
 683                         }
 684
 685                         $type = self::getTypeOfItem($item);
 686                 }
 687
 688                 if (!$object_mode) {
 689                         $data = ['@context' => ActivityPub::CONTEXT];
 690
 691                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 692                                 $type = 'Undo';
 693                         } elseif ($item['deleted']) {
 694                                 $type = 'Delete';
 695                         }
 696                 } else {
 697                         $data = [];
 698                 }
 699
 700                 $data['id'] = $item['uri'] . '#' . $type;
 701                 $data['type'] = $type;
 702
 703                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 704                         $data['actor'] = $item['author-link'];
 705                 } else {
 706                         $data['actor'] = $item['owner-link'];
 707                 }
 708
 709                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 710
 711                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 712
 713                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 714
 715                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 716                         $data['object'] = self::createNote($item);
 717                 } elseif ($data['type'] == 'Announce') {
 718                         $data = self::createAnnounce($item, $data);
 719                 } elseif ($data['type'] == 'Follow') {
 720                         $data['object'] = $item['parent-uri'];
 721                 } elseif ($data['type'] == 'Undo') {
 722                         $data['object'] = self::createActivityFromItem($item_id, true);
 723                 } else {
 724                         $data['diaspora:guid'] = $item['guid'];
 725                         if (!empty($item['signed_text'])) {
 726                                 $data['diaspora:like'] = $item['signed_text'];
 727                         }
 728                         $data['object'] = $item['thr-parent'];
 729                 }
 730
 731                 if (!empty($item['contact-uid'])) {
 732                         $uid = $item['contact-uid'];
 733                 } else {
 734                         $uid = $item['uid'];
 735                 }
 736
 737                 $owner = User::getOwnerDataById($uid);
 738
 739                 if (!$object_mode && !empty($owner)) {
 740                         return LDSignature::sign($data, $owner);
 741                 } else {
 742                         return $data;
 743                 }
 744
 745                 /// @todo Create "conversation" entry
 746         }
 747
 748         /**
 749          * Creates an object array for a given item id
 750          *
 751          * @param integer $item_id
 752          *
 753          * @return array with the object data
 754          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 755          * @throws \ImagickException
 756          */
 757         public static function createObjectFromItemID($item_id)
 758         {
 759                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 760
 761                 if (!DBA::isResult($item)) {
 762                         return false;
 763                 }
 764
 765                 $data = ['@context' => ActivityPub::CONTEXT];
 766                 $data = array_merge($data, self::createNote($item));
 767
 768                 return $data;
 769         }
 770
 771         /**
 772          * Creates a location entry for a given item array
 773          *
 774          * @param array $item
 775          *
 776          * @return array with location array
 777          */
 778         private static function createLocation($item)
 779         {
 780                 $location = ['type' => 'Place'];
 781
 782                 if (!empty($item['location'])) {
 783                         $location['name'] = $item['location'];
 784                 }
 785
 786                 $coord = [];
 787
 788                 if (empty($item['coord'])) {
 789                         $coord = Map::getCoordinates($item['location']);
 790                 } else {
 791                         $coords = explode(' ', $item['coord']);
 792                         if (count($coords) == 2) {
 793                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 794                         }
 795                 }
 796
 797                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 798                         $location['latitude'] = $coord['lat'];
 799                         $location['longitude'] = $coord['lon'];
 800                 }
 801
 802                 return $location;
 803         }
 804
 805         /**
 806          * Returns a tag array for a given item array
 807          *
 808          * @param array $item
 809          *
 810          * @return array of tags
 811          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 812          */
 813         private static function createTagList($item)
 814         {
 815                 $tags = [];
 816
 817                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 818                 foreach ($terms as $term) {
 819                         if ($term['type'] == Term::HASHTAG) {
 820                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 821                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 822                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 823                                 $contact = Contact::getDetailsByURL($term['url']);
 824                                 if (!empty($contact['addr'])) {
 825                                         $mention = '@' . $contact['addr'];
 826                                 } else {
 827                                         $mention = '@' . $term['url'];
 828                                 }
 829
 830                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 831                         }
 832                 }
 833                 return $tags;
 834         }
 835
 836         /**
 837          * Adds attachment data to the JSON document
 838          *
 839          * @param array  $item Data of the item that is to be posted
 840          * @param string $type Object type
 841          *
 842          * @return array with attachment data
 843          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 844          */
 845         private static function createAttachmentList($item, $type)
 846         {
 847                 $attachments = [];
 848
 849                 $arr = explode('[/attach],', $item['attach']);
 850                 if (count($arr)) {
 851                         foreach ($arr as $r) {
 852                                 $matches = false;
 853                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 854                                 if ($cnt) {
 855                                         $attributes = ['type' => 'Document',
 856                                                         'mediaType' => $matches[3],
 857                                                         'url' => $matches[1],
 858                                                         'name' => null];
 859
 860                                         if (trim($matches[4]) != '') {
 861                                                 $attributes['name'] = trim($matches[4]);
 862                                         }
 863
 864                                         $attachments[] = $attributes;
 865                                 }
 866                         }
 867                 }
 868
 869                 if ($type != 'Note') {
 870                         return $attachments;
 871                 }
 872
 873                 // Simplify image codes
 874                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 875
 876                 // Grab all pictures and create attachments out of them
 877                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 878                         foreach ($pictures[1] as $picture) {
 879                                 $imgdata = Image::getInfoFromURL($picture);
 880                                 if ($imgdata) {
 881                                         $attachments[] = ['type' => 'Document',
 882                                                 'mediaType' => $imgdata['mime'],
 883                                                 'url' => $picture,
 884                                                 'name' => null];
 885                                 }
 886                         }
 887                 }
 888
 889                 return $attachments;
 890         }
 891
 892         /**
 893          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 894          *
 895          * @param array $match Matching values for the callback
 896          * @return string Replaced mention
 897          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 898          */
 899         private static function mentionCallback($match)
 900         {
 901                 if (empty($match[1])) {
 902                         return '';
 903                 }
 904
 905                 $data = Contact::getDetailsByURL($match[1]);
 906                 if (empty($data['nick'])) {
 907                         return $match[0];
 908                 }
 909
 910                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 911         }
 912
 913         /**
 914          * Remove image elements and replaces them with links to the image
 915          *
 916          * @param string $body
 917          *
 918          * @return string with replaced elements
 919          */
 920         private static function removePictures($body)
 921         {
 922                 // Simplify image codes
 923                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 924
 925                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 926                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 927
 928                 return $body;
 929         }
 930
 931         /**
 932          * Fetches the "context" value for a givem item array from the "conversation" table
 933          *
 934          * @param array $item
 935          *
 936          * @return string with context url
 937          * @throws \Exception
 938          */
 939         private static function fetchContextURLForItem($item)
 940         {
 941                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 942                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 943                         $context_uri = $conversation['conversation-href'];
 944                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 945                         $context_uri = $conversation['conversation-uri'];
 946                 } else {
 947                         $context_uri = $item['parent-uri'] . '#context';
 948                 }
 949                 return $context_uri;
 950         }
 951
 952         /**
 953          * Returns if the post contains sensitive content ("nsfw")
 954          *
 955          * @param integer $item_id
 956          *
 957          * @return boolean
 958          * @throws \Exception
 959          */
 960         private static function isSensitive($item_id)
 961         {
 962                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 963                 return DBA::exists('term', $condition);
 964         }
 965
 966         /**
 967          * Creates event data
 968          *
 969          * @param array $item
 970          *
 971          * @return array with the event data
 972          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 973          */
 974         public static function createEvent($item)
 975         {
 976                 $event = [];
 977                 $event['name'] = $item['event-summary'];
 978                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
 979                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
 980
 981                 if (!$item['event-nofinish']) {
 982                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
 983                 }
 984
 985                 if (!empty($item['event-location'])) {
 986                         $item['location'] = $item['event-location'];
 987                         $event['location'] = self::createLocation($item);
 988                 }
 989
 990                 return $event;
 991         }
 992
 993         /**
 994          * Creates a note/article object array
 995          *
 996          * @param array $item
 997          *
 998          * @return array with the object data
 999          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1000          * @throws \ImagickException
1001          */
1002         public static function createNote($item)
1003         {
1004                 if ($item['event-type'] == 'event') {
1005                         $type = 'Event';
1006                 } elseif (!empty($item['title'])) {
1007                         $type = 'Article';
1008                 } else {
1009                         $type = 'Note';
1010                 }
1011
1012                 if ($item['deleted']) {
1013                         $type = 'Tombstone';
1014                 }
1015
1016                 $data = [];
1017                 $data['id'] = $item['uri'];
1018                 $data['type'] = $type;
1019
1020                 if ($item['deleted']) {
1021                         return $data;
1022                 }
1023
1024                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1025
1026                 if ($item['uri'] != $item['thr-parent']) {
1027                         $data['inReplyTo'] = $item['thr-parent'];
1028                 } else {
1029                         $data['inReplyTo'] = null;
1030                 }
1031
1032                 $data['diaspora:guid'] = $item['guid'];
1033                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1034
1035                 if ($item['created'] != $item['edited']) {
1036                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1037                 }
1038
1039                 $data['url'] = $item['plink'];
1040                 $data['attributedTo'] = $item['author-link'];
1041                 $data['sensitive'] = self::isSensitive($item['id']);
1042                 $data['context'] = self::fetchContextURLForItem($item);
1043
1044                 if (!empty($item['title'])) {
1045                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1046                 }
1047
1048                 $permission_block = self::createPermissionBlockForItem($item, false);
1049
1050                 $body = $item['body'];
1051
1052                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1053                         $body = self::prependMentions($body, $permission_block);
1054                 }
1055
1056                 if ($type == 'Note') {
1057                         $body = self::removePictures($body);
1058                 } elseif (($type == 'Article') && empty($data['summary'])) {
1059                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1060                 }
1061
1062                 if ($type == 'Event') {
1063                         $data = array_merge($data, self::createEvent($item));
1064                 } else {
1065                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1066                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1067
1068                         $data['content'] = BBCode::convert($body, false, 7);
1069                 }
1070
1071                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1072
1073                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1074                         $data['diaspora:comment'] = $item['signed_text'];
1075                 }
1076
1077                 $data['attachment'] = self::createAttachmentList($item, $type);
1078                 $data['tag'] = self::createTagList($item);
1079
1080                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1081                         $data['location'] = self::createLocation($item);
1082                 }
1083
1084                 if (!empty($item['app'])) {
1085                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1086                 }
1087
1088                 $data = array_merge($data, $permission_block);
1089
1090                 return $data;
1091         }
1092
1093         /**
1094          * Creates an announce object entry
1095          *
1096          * @param array $item
1097          * @param array $data activity data
1098          *
1099          * @return array with activity data
1100          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1101          * @throws \ImagickException
1102          */
1103         private static function createAnnounce($item, $data)
1104         {
1105                 $announce = api_share_as_retweet($item);
1106                 if (empty($announce['plink'])) {
1107                         $data['type'] = 'Create';
1108                         $data['object'] = self::createNote($item);
1109                         return $data;
1110                 }
1111
1112                 // Fetch the original id of the object
1113                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1114                 if (!empty($activity)) {
1115                         $ldactivity = JsonLD::compact($activity);
1116                         $id = JsonLD::fetchElement($ldactivity, '@id');
1117                         if (!empty($id)) {
1118                                 $data['object'] = $id;
1119                                 return $data;
1120                         }
1121                 }
1122
1123                 $data['type'] = 'Create';
1124                 $data['object'] = self::createNote($item);
1125                 return $data;
1126         }
1127
1128         /**
1129          * Creates an activity id for a given contact id
1130          *
1131          * @param integer $cid Contact ID of target
1132          *
1133          * @return bool|string activity id
1134          */
1135         public static function activityIDFromContact($cid)
1136         {
1137                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1138                 if (!DBA::isResult($contact)) {
1139                         return false;
1140                 }
1141
1142                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1143                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1144                 return System::baseUrl() . '/activity/' . $uuid;
1145         }
1146
1147         /**
1148          * Transmits a contact suggestion to a given inbox
1149          *
1150          * @param integer $uid           User ID
1151          * @param string  $inbox         Target inbox
1152          * @param integer $suggestion_id Suggestion ID
1153          *
1154          * @return boolean was the transmission successful?
1155          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1156          */
1157         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1158         {
1159                 $owner = User::getOwnerDataById($uid);
1160
1161                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1162
1163                 $data = ['@context' => ActivityPub::CONTEXT,
1164                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1165                         'type' => 'Announce',
1166                         'actor' => $owner['url'],
1167                         'object' => $suggestion['url'],
1168                         'content' => $suggestion['note'],
1169                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1170                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1171                         'cc' => []];
1172
1173                 $signed = LDSignature::sign($data, $owner);
1174
1175                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1176                 return HTTPSignature::transmit($signed, $inbox, $uid);
1177         }
1178
1179         /**
1180          * Transmits a profile relocation to a given inbox
1181          *
1182          * @param integer $uid   User ID
1183          * @param string  $inbox Target inbox
1184          *
1185          * @return boolean was the transmission successful?
1186          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1187          */
1188         public static function sendProfileRelocation($uid, $inbox)
1189         {
1190                 $owner = User::getOwnerDataById($uid);
1191
1192                 $data = ['@context' => ActivityPub::CONTEXT,
1193                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1194                         'type' => 'dfrn:relocate',
1195                         'actor' => $owner['url'],
1196                         'object' => $owner['url'],
1197                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1198                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1199                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1200                         'cc' => []];
1201
1202                 $signed = LDSignature::sign($data, $owner);
1203
1204                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1205                 return HTTPSignature::transmit($signed, $inbox, $uid);
1206         }
1207
1208         /**
1209          * Transmits a profile deletion to a given inbox
1210          *
1211          * @param integer $uid   User ID
1212          * @param string  $inbox Target inbox
1213          *
1214          * @return boolean was the transmission successful?
1215          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1216          */
1217         public static function sendProfileDeletion($uid, $inbox)
1218         {
1219                 $owner = User::getOwnerDataById($uid);
1220
1221                 if (empty($owner)) {
1222                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1223                         return false;
1224                 }
1225
1226                 if (empty($owner['uprvkey'])) {
1227                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1228                         return false;
1229                 }
1230
1231                 $data = ['@context' => ActivityPub::CONTEXT,
1232                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1233                         'type' => 'Delete',
1234                         'actor' => $owner['url'],
1235                         'object' => $owner['url'],
1236                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1237                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1238                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1239                         'cc' => []];
1240
1241                 $signed = LDSignature::sign($data, $owner);
1242
1243                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1244                 return HTTPSignature::transmit($signed, $inbox, $uid);
1245         }
1246
1247         /**
1248          * Transmits a profile change to a given inbox
1249          *
1250          * @param integer $uid   User ID
1251          * @param string  $inbox Target inbox
1252          *
1253          * @return boolean was the transmission successful?
1254          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1255          * @throws \ImagickException
1256          */
1257         public static function sendProfileUpdate($uid, $inbox)
1258         {
1259                 $owner = User::getOwnerDataById($uid);
1260                 $profile = APContact::getByURL($owner['url']);
1261
1262                 $data = ['@context' => ActivityPub::CONTEXT,
1263                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1264                         'type' => 'Update',
1265                         'actor' => $owner['url'],
1266                         'object' => self::getProfile($uid),
1267                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1268                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1269                         'to' => [$profile['followers']],
1270                         'cc' => []];
1271
1272                 $signed = LDSignature::sign($data, $owner);
1273
1274                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1275                 return HTTPSignature::transmit($signed, $inbox, $uid);
1276         }
1277
1278         /**
1279          * Transmits a given activity to a target
1280          *
1281          * @param string  $activity Type name
1282          * @param string  $target   Target profile
1283          * @param integer $uid      User ID
1284          * @return bool
1285          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1286          * @throws \ImagickException
1287          * @throws \Exception
1288          */
1289         public static function sendActivity($activity, $target, $uid, $id = '')
1290         {
1291                 $profile = APContact::getByURL($target);
1292
1293                 $owner = User::getOwnerDataById($uid);
1294
1295                 if (empty($id)) {
1296                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1297                 }
1298
1299                 $data = ['@context' => ActivityPub::CONTEXT,
1300                         'id' => $id,
1301                         'type' => $activity,
1302                         'actor' => $owner['url'],
1303                         'object' => $profile['url'],
1304                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1305                         'to' => [$profile['url']]];
1306
1307                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1308
1309                 $signed = LDSignature::sign($data, $owner);
1310                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1311         }
1312
1313         /**
1314          * Transmits a "follow object" activity to a target
1315          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1316          *
1317          * @param string  $object Object URL
1318          * @param string  $target Target profile
1319          * @param integer $uid    User ID
1320          * @return bool
1321          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1322          * @throws \ImagickException
1323          * @throws \Exception
1324          */
1325         public static function sendFollowObject($object, $target, $uid = 0)
1326         {
1327                 $profile = APContact::getByURL($target);
1328
1329                 if (empty($uid)) {
1330                         // Fetch the list of administrators
1331                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1332
1333                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1334                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1335                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1336                         $uid = $first_user['uid'];
1337                 }
1338
1339                 $condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1340                         'author-id' => Contact::getPublicIdByUserId($uid)];
1341                 if (Item::exists($condition)) {
1342                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1343                         return false;
1344                 }
1345
1346                 $owner = User::getOwnerDataById($uid);
1347
1348                 $data = ['@context' => ActivityPub::CONTEXT,
1349                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1350                         'type' => 'Follow',
1351                         'actor' => $owner['url'],
1352                         'object' => $object,
1353                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1354                         'to' => [$profile['url']]];
1355
1356                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1357
1358                 $signed = LDSignature::sign($data, $owner);
1359                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1360         }
1361
1362         /**
1363          * Transmit a message that the contact request had been accepted
1364          *
1365          * @param string  $target Target profile
1366          * @param         $id
1367          * @param integer $uid    User ID
1368          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1369          * @throws \ImagickException
1370          */
1371         public static function sendContactAccept($target, $id, $uid)
1372         {
1373                 $profile = APContact::getByURL($target);
1374
1375                 $owner = User::getOwnerDataById($uid);
1376                 $data = ['@context' => ActivityPub::CONTEXT,
1377                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1378                         'type' => 'Accept',
1379                         'actor' => $owner['url'],
1380                         'object' => ['id' => $id, 'type' => 'Follow',
1381                                 'actor' => $profile['url'],
1382                                 'object' => $owner['url']],
1383                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1384                         'to' => [$profile['url']]];
1385
1386                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1387
1388                 $signed = LDSignature::sign($data, $owner);
1389                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1390         }
1391
1392         /**
1393          * Reject a contact request or terminates the contact relation
1394          *
1395          * @param string  $target Target profile
1396          * @param         $id
1397          * @param integer $uid    User ID
1398          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1399          * @throws \ImagickException
1400          */
1401         public static function sendContactReject($target, $id, $uid)
1402         {
1403                 $profile = APContact::getByURL($target);
1404
1405                 $owner = User::getOwnerDataById($uid);
1406                 $data = ['@context' => ActivityPub::CONTEXT,
1407                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1408                         'type' => 'Reject',
1409                         'actor' => $owner['url'],
1410                         'object' => ['id' => $id, 'type' => 'Follow',
1411                                 'actor' => $profile['url'],
1412                                 'object' => $owner['url']],
1413                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1414                         'to' => [$profile['url']]];
1415
1416                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1417
1418                 $signed = LDSignature::sign($data, $owner);
1419                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1420         }
1421
1422         /**
1423          * Transmits a message that we don't want to follow this contact anymore
1424          *
1425          * @param string  $target Target profile
1426          * @param integer $uid    User ID
1427          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1428          * @throws \ImagickException
1429          * @throws \Exception
1430          */
1431         public static function sendContactUndo($target, $cid, $uid)
1432         {
1433                 $profile = APContact::getByURL($target);
1434
1435                 $object_id = self::activityIDFromContact($cid);
1436                 if (empty($object_id)) {
1437                         return;
1438                 }
1439
1440                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1441
1442                 $owner = User::getOwnerDataById($uid);
1443                 $data = ['@context' => ActivityPub::CONTEXT,
1444                         'id' => $id,
1445                         'type' => 'Undo',
1446                         'actor' => $owner['url'],
1447                         'object' => ['id' => $object_id, 'type' => 'Follow',
1448                                 'actor' => $owner['url'],
1449                                 'object' => $profile['url']],
1450                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1451                         'to' => [$profile['url']]];
1452
1453                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1454
1455                 $signed = LDSignature::sign($data, $owner);
1456                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1457         }
1458
1459         private static function prependMentions($body, array $permission_block)
1460         {
1461                 if (Config::get('system', 'disable_implicit_mentions')) {
1462                         return $body;
1463                 }
1464
1465                 $mentions = [];
1466
1467                 foreach ($permission_block['to'] as $profile_url) {
1468                         $profile = Contact::getDetailsByURL($profile_url);
1469                         if (!empty($profile['addr'])
1470                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1471                                 && !strstr($body, $profile['addr'])
1472                                 && !strstr($body, $profile_url)
1473                         ) {
1474                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1475                         }
1476                 }
1477
1478                 $mentions[] = $body;
1479
1480                 return implode(' ', $mentions);
1481         }
1482 }