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          * @param string $username
 252          * @return array
 253          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 254          */
 255         public static function getDeletedUser($username)
 256         {
 257                 return [
 258                         '@context' => ActivityPub::CONTEXT,
 259                         'id' => System::baseUrl() . '/profile/' . $username,
 260                         'type' => 'Tombstone',
 261                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 262                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 263                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 264                 ];
 265         }
 266
 267         /**
 268          * Returns an array with permissions of a given item array
 269          *
 270          * @param array $item
 271          *
 272          * @return array with permissions
 273          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 274          * @throws \ImagickException
 275          */
 276         private static function fetchPermissionBlockFromConversation($item)
 277         {
 278                 if (empty($item['thr-parent'])) {
 279                         return [];
 280                 }
 281
 282                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 283                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 284                 if (!DBA::isResult($conversation)) {
 285                         return [];
 286                 }
 287
 288                 $activity = json_decode($conversation['source'], true);
 289
 290                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 291                 $profile = APContact::getByURL($actor);
 292
 293                 $item_profile = APContact::getByURL($item['author-link']);
 294                 $exclude[] = $item['author-link'];
 295
 296                 if ($item['gravity'] == GRAVITY_PARENT) {
 297                         $exclude[] = $item['owner-link'];
 298                 }
 299
 300                 $permissions['to'][] = $actor;
 301
 302                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 303                         if (empty($activity[$element])) {
 304                                 continue;
 305                         }
 306                         if (is_string($activity[$element])) {
 307                                 $activity[$element] = [$activity[$element]];
 308                         }
 309
 310                         foreach ($activity[$element] as $receiver) {
 311                                 if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 312                                         $permissions[$element][] = $item_profile['followers'];
 313                                 } elseif (!in_array($receiver, $exclude)) {
 314                                         $permissions[$element][] = $receiver;
 315                                 }
 316                         }
 317                 }
 318                 return $permissions;
 319         }
 320
 321         /**
 322          * Creates an array of permissions from an item thread
 323          *
 324          * @param array   $item       Item array
 325          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 326          * @param integer $last_id    Last item id for adding receivers
 327          * @param boolean $forum_mode "true" means that we are sending content to a forum
 328          *
 329          * @return array with permission data
 330          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 331          * @throws \ImagickException
 332          */
 333         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 334         {
 335                 if ($last_id == 0) {
 336                         $last_id = $item['id'];
 337                 }
 338
 339                 $always_bcc = false;
 340
 341                 // Check if we should always deliver our stuff via BCC
 342                 if (!empty($item['uid'])) {
 343                         $profile = Profile::getByUID($item['uid']);
 344                         if (!empty($profile)) {
 345                                 $always_bcc = $profile['hide-friends'];
 346                         }
 347                 }
 348
 349                 if (Config::get('debug', 'total_ap_delivery')) {
 350                         // Will be activated in a later step
 351                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 352                 } else {
 353                         // For now only send to these contacts:
 354                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 355                 }
 356
 357                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 358
 359                 if ($item['gravity'] == GRAVITY_PARENT) {
 360                         $actor_profile = APContact::getByURL($item['owner-link']);
 361                 } else {
 362                         $actor_profile = APContact::getByURL($item['author-link']);
 363                 }
 364
 365                 $terms = Term::tagArrayFromItemId($item['id'], [Term::MENTION, Term::IMPLICIT_MENTION]);
 366
 367                 if (!$item['private']) {
 368                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 369
 370                         $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 371
 372                         foreach ($terms as $term) {
 373                                 $profile = APContact::getByURL($term['url'], false);
 374                                 if (!empty($profile)) {
 375                                         $data['to'][] = $profile['url'];
 376                                 }
 377                         }
 378                 } else {
 379                         $receiver_list = Item::enumeratePermissions($item);
 380
 381                         foreach ($terms as $term) {
 382                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 383                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 384                                         $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => $networks]);
 385                                         if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 386                                                 $data['to'][] = $profile['url'];
 387                                         }
 388                                 }
 389                         }
 390
 391                         foreach ($receiver_list as $receiver) {
 392                                 $contact = DBA::selectFirst('contact', ['url', 'hidden'], ['id' => $receiver, 'network' => $networks]);
 393                                 if (DBA::isResult($contact) && !empty($profile = APContact::getByURL($contact['url'], false))) {
 394                                         if ($contact['hidden'] || $always_bcc) {
 395                                                 $data['bcc'][] = $profile['url'];
 396                                         } else {
 397                                                 $data['cc'][] = $profile['url'];
 398                                         }
 399                                 }
 400                         }
 401                 }
 402
 403                 $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 404                 while ($parent = Item::fetch($parents)) {
 405                         if ($parent['gravity'] == GRAVITY_PARENT) {
 406                                 $profile = APContact::getByURL($parent['owner-link'], false);
 407                                 if (!empty($profile)) {
 408                                         if ($item['gravity'] != GRAVITY_PARENT) {
 409                                                 // Comments to forums are directed to the forum
 410                                                 // But comments to forums aren't directed to the followers collection
 411                                                 if ($profile['type'] == 'Group') {
 412                                                         $data['to'][] = $profile['url'];
 413                                                 } else {
 414                                                         $data['cc'][] = $profile['url'];
 415                                                         if (!$item['private']) {
 416                                                                 $data['cc'][] = $actor_profile['followers'];
 417                                                         }
 418                                                 }
 419                                         } else {
 420                                                 // Public thread parent post always are directed to the followes
 421                                                 if (!$item['private'] && !$forum_mode) {
 422                                                         $data['cc'][] = $actor_profile['followers'];
 423                                                 }
 424                                         }
 425                                 }
 426                         }
 427
 428                         // Don't include data from future posts
 429                         if ($parent['id'] >= $last_id) {
 430                                 continue;
 431                         }
 432
 433                         $profile = APContact::getByURL($parent['author-link'], false);
 434                         if (!empty($profile)) {
 435                                 if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 436                                         $data['to'][] = $profile['url'];
 437                                 } else {
 438                                         $data['cc'][] = $profile['url'];
 439                                 }
 440                         }
 441                 }
 442                 DBA::close($parents);
 443
 444                 $data['to'] = array_unique($data['to']);
 445                 $data['cc'] = array_unique($data['cc']);
 446                 $data['bcc'] = array_unique($data['bcc']);
 447
 448                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 449                         unset($data['to'][$key]);
 450                 }
 451
 452                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 453                         unset($data['cc'][$key]);
 454                 }
 455
 456                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 457                         unset($data['bcc'][$key]);
 458                 }
 459
 460                 foreach ($data['to'] as $to) {
 461                         if (($key = array_search($to, $data['cc'])) !== false) {
 462                                 unset($data['cc'][$key]);
 463                         }
 464
 465                         if (($key = array_search($to, $data['bcc'])) !== false) {
 466                                 unset($data['bcc'][$key]);
 467                         }
 468                 }
 469
 470                 foreach ($data['cc'] as $cc) {
 471                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 472                                 unset($data['bcc'][$key]);
 473                         }
 474                 }
 475
 476                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 477
 478                 if (!$blindcopy) {
 479                         unset($receivers['bcc']);
 480                 }
 481
 482                 return $receivers;
 483         }
 484
 485         /**
 486          * Check if an inbox is archived
 487          *
 488          * @param string $url Inbox url
 489          *
 490          * @return boolean "true" if inbox is archived
 491          */
 492         private static function archivedInbox($url)
 493         {
 494                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 495         }
 496
 497         /**
 498          * Fetches a list of inboxes of followers of a given user
 499          *
 500          * @param integer $uid      User ID
 501          * @param boolean $personal fetch personal inboxes
 502          *
 503          * @return array of follower inboxes
 504          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 505          * @throws \ImagickException
 506          */
 507         public static function fetchTargetInboxesforUser($uid, $personal = false)
 508         {
 509                 $inboxes = [];
 510
 511                 if (Config::get('debug', 'total_ap_delivery')) {
 512                         // Will be activated in a later step
 513                         $networks = [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS];
 514                 } else {
 515                         // For now only send to these contacts:
 516                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 517                 }
 518
 519                 $condition = ['uid' => $uid, 'network' => $networks, 'archive' => false, 'pending' => false];
 520
 521                 if (!empty($uid)) {
 522                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 523                 }
 524
 525                 $contacts = DBA::select('contact', ['url'], $condition);
 526                 while ($contact = DBA::fetch($contacts)) {
 527                         if (Network::isUrlBlocked($contact['url'])) {
 528                                 continue;
 529                         }
 530
 531                         $profile = APContact::getByURL($contact['url'], false);
 532                         if (!empty($profile)) {
 533                                 if (empty($profile['sharedinbox']) || $personal) {
 534                                         $target = $profile['inbox'];
 535                                 } else {
 536                                         $target = $profile['sharedinbox'];
 537                                 }
 538                                 if (!self::archivedInbox($target)) {
 539                                         $inboxes[$target] = $target;
 540                                 }
 541                         }
 542                 }
 543                 DBA::close($contacts);
 544
 545                 return $inboxes;
 546         }
 547
 548         /**
 549          * Fetches an array of inboxes for the given item and user
 550          *
 551          * @param array   $item       Item array
 552          * @param integer $uid        User ID
 553          * @param boolean $personal   fetch personal inboxes
 554          * @param integer $last_id    Last item id for adding receivers
 555          * @param boolean $forum_mode "true" means that we are sending content to a forum
 556          * @return array with inboxes
 557          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 558          * @throws \ImagickException
 559          */
 560         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 561         {
 562                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 563                 if (empty($permissions)) {
 564                         return [];
 565                 }
 566
 567                 $inboxes = [];
 568
 569                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 570                         $item_profile = APContact::getByURL($item['author-link'], false);
 571                 } else {
 572                         $item_profile = APContact::getByURL($item['owner-link'], false);
 573                 }
 574
 575                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 576                         if (empty($permissions[$element])) {
 577                                 continue;
 578                         }
 579
 580                         $blindcopy = in_array($element, ['bto', 'bcc']);
 581
 582                         foreach ($permissions[$element] as $receiver) {
 583                                 if (Network::isUrlBlocked($receiver)) {
 584                                         continue;
 585                                 }
 586
 587                                 if ($receiver == $item_profile['followers']) {
 588                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 589                                 } else {
 590                                         $profile = APContact::getByURL($receiver, false);
 591                                         if (!empty($profile)) {
 592                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 593                                                         $target = $profile['inbox'];
 594                                                 } else {
 595                                                         $target = $profile['sharedinbox'];
 596                                                 }
 597                                                 if (!self::archivedInbox($target)) {
 598                                                         $inboxes[$target] = $target;
 599                                                 }
 600                                         }
 601                                 }
 602                         }
 603                 }
 604
 605                 return $inboxes;
 606         }
 607
 608         /**
 609          * Returns the activity type of a given item
 610          *
 611          * @param array $item
 612          *
 613          * @return string with activity type
 614          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 615          * @throws \ImagickException
 616          */
 617         private static function getTypeOfItem($item)
 618         {
 619                 $reshared = false;
 620
 621                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 622                 if (strpos($item['body'], "[share") === 0) {
 623                         $announce = api_share_as_retweet($item);
 624                         $reshared = !empty($announce['plink']);
 625                 }
 626
 627                 if ($reshared) {
 628                         $type = 'Announce';
 629                 } elseif ($item['verb'] == ACTIVITY_POST) {
 630                         if ($item['created'] == $item['edited']) {
 631                                 $type = 'Create';
 632                         } else {
 633                                 $type = 'Update';
 634                         }
 635                 } elseif ($item['verb'] == ACTIVITY_LIKE) {
 636                         $type = 'Like';
 637                 } elseif ($item['verb'] == ACTIVITY_DISLIKE) {
 638                         $type = 'Dislike';
 639                 } elseif ($item['verb'] == ACTIVITY_ATTEND) {
 640                         $type = 'Accept';
 641                 } elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
 642                         $type = 'Reject';
 643                 } elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
 644                         $type = 'TentativeAccept';
 645                 } elseif ($item['verb'] == ACTIVITY_FOLLOW) {
 646                         $type = 'Follow';
 647                 } else {
 648                         $type = '';
 649                 }
 650
 651                 return $type;
 652         }
 653
 654         /**
 655          * Creates the activity or fetches it from the cache
 656          *
 657          * @param integer $item_id
 658          * @param boolean $force Force new cache entry
 659          *
 660          * @return array with the activity
 661          * @throws \Exception
 662          */
 663         public static function createCachedActivityFromItem($item_id, $force = false)
 664         {
 665                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 666
 667                 if (!$force) {
 668                         $data = Cache::get($cachekey);
 669                         if (!is_null($data)) {
 670                                 return $data;
 671                         }
 672                 }
 673
 674                 $data = ActivityPub\Transmitter::createActivityFromItem($item_id);
 675
 676                 Cache::set($cachekey, $data, Cache::QUARTER_HOUR);
 677                 return $data;
 678         }
 679
 680         /**
 681          * Creates an activity array for a given item id
 682          *
 683          * @param integer $item_id
 684          * @param boolean $object_mode Is the activity item is used inside another object?
 685          *
 686          * @return array of activity
 687          * @throws \Exception
 688          */
 689         public static function createActivityFromItem($item_id, $object_mode = false)
 690         {
 691                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 692
 693                 if (!DBA::isResult($item)) {
 694                         return false;
 695                 }
 696
 697                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 698                         $owner = User::getOwnerDataById($item['uid']);
 699                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 700                                 $type = 'Announce';
 701
 702                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 703                                 $item['body'] = share_header($item['author-name'], $item['author-link'], $item['author-avatar'],
 704                                         $item['guid'], $item['created'], $item['plink']) . $item['body'] . '[/share]';
 705                         }
 706                 }
 707
 708                 if (empty($type)) {
 709                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 710                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 711                         if (DBA::isResult($conversation)) {
 712                                 $data = json_decode($conversation['source']);
 713                                 if (!empty($data)) {
 714                                         return $data;
 715                                 }
 716                         }
 717
 718                         $type = self::getTypeOfItem($item);
 719                 }
 720
 721                 if (!$object_mode) {
 722                         $data = ['@context' => ActivityPub::CONTEXT];
 723
 724                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 725                                 $type = 'Undo';
 726                         } elseif ($item['deleted']) {
 727                                 $type = 'Delete';
 728                         }
 729                 } else {
 730                         $data = [];
 731                 }
 732
 733                 $data['id'] = $item['uri'] . '#' . $type;
 734                 $data['type'] = $type;
 735
 736                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 737                         $data['actor'] = $item['author-link'];
 738                 } else {
 739                         $data['actor'] = $item['owner-link'];
 740                 }
 741
 742                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 743
 744                 $data['instrument'] = ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()];
 745
 746                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 747
 748                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 749                         $data['object'] = self::createNote($item);
 750                 } elseif ($data['type'] == 'Announce') {
 751                         $data = self::createAnnounce($item, $data);
 752                 } elseif ($data['type'] == 'Follow') {
 753                         $data['object'] = $item['parent-uri'];
 754                 } elseif ($data['type'] == 'Undo') {
 755                         $data['object'] = self::createActivityFromItem($item_id, true);
 756                 } else {
 757                         $data['diaspora:guid'] = $item['guid'];
 758                         if (!empty($item['signed_text'])) {
 759                                 $data['diaspora:like'] = $item['signed_text'];
 760                         }
 761                         $data['object'] = $item['thr-parent'];
 762                 }
 763
 764                 if (!empty($item['contact-uid'])) {
 765                         $uid = $item['contact-uid'];
 766                 } else {
 767                         $uid = $item['uid'];
 768                 }
 769
 770                 $owner = User::getOwnerDataById($uid);
 771
 772                 if (!$object_mode && !empty($owner)) {
 773                         return LDSignature::sign($data, $owner);
 774                 } else {
 775                         return $data;
 776                 }
 777
 778                 /// @todo Create "conversation" entry
 779         }
 780
 781         /**
 782          * Creates an object array for a given item id
 783          *
 784          * @param integer $item_id
 785          *
 786          * @return array with the object data
 787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 788          * @throws \ImagickException
 789          */
 790         public static function createObjectFromItemID($item_id)
 791         {
 792                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 793
 794                 if (!DBA::isResult($item)) {
 795                         return false;
 796                 }
 797
 798                 $data = ['@context' => ActivityPub::CONTEXT];
 799                 $data = array_merge($data, self::createNote($item));
 800
 801                 return $data;
 802         }
 803
 804         /**
 805          * Creates a location entry for a given item array
 806          *
 807          * @param array $item
 808          *
 809          * @return array with location array
 810          */
 811         private static function createLocation($item)
 812         {
 813                 $location = ['type' => 'Place'];
 814
 815                 if (!empty($item['location'])) {
 816                         $location['name'] = $item['location'];
 817                 }
 818
 819                 $coord = [];
 820
 821                 if (empty($item['coord'])) {
 822                         $coord = Map::getCoordinates($item['location']);
 823                 } else {
 824                         $coords = explode(' ', $item['coord']);
 825                         if (count($coords) == 2) {
 826                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 827                         }
 828                 }
 829
 830                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 831                         $location['latitude'] = $coord['lat'];
 832                         $location['longitude'] = $coord['lon'];
 833                 }
 834
 835                 return $location;
 836         }
 837
 838         /**
 839          * Returns a tag array for a given item array
 840          *
 841          * @param array $item
 842          *
 843          * @return array of tags
 844          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 845          */
 846         private static function createTagList($item)
 847         {
 848                 $tags = [];
 849
 850                 $terms = Term::tagArrayFromItemId($item['id'], [Term::HASHTAG, Term::MENTION, Term::IMPLICIT_MENTION]);
 851                 foreach ($terms as $term) {
 852                         if ($term['type'] == Term::HASHTAG) {
 853                                 $url = System::baseUrl() . '/search?tag=' . urlencode($term['term']);
 854                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['term']];
 855                         } elseif ($term['type'] == Term::MENTION || $term['type'] == Term::IMPLICIT_MENTION) {
 856                                 $contact = Contact::getDetailsByURL($term['url']);
 857                                 if (!empty($contact['addr'])) {
 858                                         $mention = '@' . $contact['addr'];
 859                                 } else {
 860                                         $mention = '@' . $term['url'];
 861                                 }
 862
 863                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
 864                         }
 865                 }
 866                 return $tags;
 867         }
 868
 869         /**
 870          * Adds attachment data to the JSON document
 871          *
 872          * @param array  $item Data of the item that is to be posted
 873          * @param string $type Object type
 874          *
 875          * @return array with attachment data
 876          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 877          */
 878         private static function createAttachmentList($item, $type)
 879         {
 880                 $attachments = [];
 881
 882                 $arr = explode('[/attach],', $item['attach']);
 883                 if (count($arr)) {
 884                         foreach ($arr as $r) {
 885                                 $matches = false;
 886                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
 887                                 if ($cnt) {
 888                                         $attributes = ['type' => 'Document',
 889                                                         'mediaType' => $matches[3],
 890                                                         'url' => $matches[1],
 891                                                         'name' => null];
 892
 893                                         if (trim($matches[4]) != '') {
 894                                                 $attributes['name'] = trim($matches[4]);
 895                                         }
 896
 897                                         $attachments[] = $attributes;
 898                                 }
 899                         }
 900                 }
 901
 902                 if ($type != 'Note') {
 903                         return $attachments;
 904                 }
 905
 906                 // Simplify image codes
 907                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
 908
 909                 // Grab all pictures and create attachments out of them
 910                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
 911                         foreach ($pictures[1] as $picture) {
 912                                 $imgdata = Image::getInfoFromURL($picture);
 913                                 if ($imgdata) {
 914                                         $attachments[] = ['type' => 'Document',
 915                                                 'mediaType' => $imgdata['mime'],
 916                                                 'url' => $picture,
 917                                                 'name' => null];
 918                                 }
 919                         }
 920                 }
 921
 922                 return $attachments;
 923         }
 924
 925         /**
 926          * @brief Callback function to replace a Friendica style mention in a mention that is used on AP
 927          *
 928          * @param array $match Matching values for the callback
 929          * @return string Replaced mention
 930          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 931          */
 932         private static function mentionCallback($match)
 933         {
 934                 if (empty($match[1])) {
 935                         return '';
 936                 }
 937
 938                 $data = Contact::getDetailsByURL($match[1]);
 939                 if (empty($data['nick'])) {
 940                         return $match[0];
 941                 }
 942
 943                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
 944         }
 945
 946         /**
 947          * Remove image elements and replaces them with links to the image
 948          *
 949          * @param string $body
 950          *
 951          * @return string with replaced elements
 952          */
 953         private static function removePictures($body)
 954         {
 955                 // Simplify image codes
 956                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
 957
 958                 $body = preg_replace("/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi", '[url]$1[/url]', $body);
 959                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '[url]$1[/url]', $body);
 960
 961                 return $body;
 962         }
 963
 964         /**
 965          * Fetches the "context" value for a givem item array from the "conversation" table
 966          *
 967          * @param array $item
 968          *
 969          * @return string with context url
 970          * @throws \Exception
 971          */
 972         private static function fetchContextURLForItem($item)
 973         {
 974                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
 975                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
 976                         $context_uri = $conversation['conversation-href'];
 977                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
 978                         $context_uri = $conversation['conversation-uri'];
 979                 } else {
 980                         $context_uri = $item['parent-uri'] . '#context';
 981                 }
 982                 return $context_uri;
 983         }
 984
 985         /**
 986          * Returns if the post contains sensitive content ("nsfw")
 987          *
 988          * @param integer $item_id
 989          *
 990          * @return boolean
 991          * @throws \Exception
 992          */
 993         private static function isSensitive($item_id)
 994         {
 995                 $condition = ['otype' => TERM_OBJ_POST, 'oid' => $item_id, 'type' => TERM_HASHTAG, 'term' => 'nsfw'];
 996                 return DBA::exists('term', $condition);
 997         }
 998
 999         /**
1000          * Creates event data
1001          *
1002          * @param array $item
1003          *
1004          * @return array with the event data
1005          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1006          */
1007         public static function createEvent($item)
1008         {
1009                 $event = [];
1010                 $event['name'] = $item['event-summary'];
1011                 $event['content'] = BBCode::convert($item['event-desc'], false, 7);
1012                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1013
1014                 if (!$item['event-nofinish']) {
1015                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1016                 }
1017
1018                 if (!empty($item['event-location'])) {
1019                         $item['location'] = $item['event-location'];
1020                         $event['location'] = self::createLocation($item);
1021                 }
1022
1023                 return $event;
1024         }
1025
1026         /**
1027          * Creates a note/article object array
1028          *
1029          * @param array $item
1030          *
1031          * @return array with the object data
1032          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1033          * @throws \ImagickException
1034          */
1035         public static function createNote($item)
1036         {
1037                 if ($item['event-type'] == 'event') {
1038                         $type = 'Event';
1039                 } elseif (!empty($item['title'])) {
1040                         $type = 'Article';
1041                 } else {
1042                         $type = 'Note';
1043                 }
1044
1045                 if ($item['deleted']) {
1046                         $type = 'Tombstone';
1047                 }
1048
1049                 $data = [];
1050                 $data['id'] = $item['uri'];
1051                 $data['type'] = $type;
1052
1053                 if ($item['deleted']) {
1054                         return $data;
1055                 }
1056
1057                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1058
1059                 if ($item['uri'] != $item['thr-parent']) {
1060                         $data['inReplyTo'] = $item['thr-parent'];
1061                 } else {
1062                         $data['inReplyTo'] = null;
1063                 }
1064
1065                 $data['diaspora:guid'] = $item['guid'];
1066                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1067
1068                 if ($item['created'] != $item['edited']) {
1069                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1070                 }
1071
1072                 $data['url'] = $item['plink'];
1073                 $data['attributedTo'] = $item['author-link'];
1074                 $data['sensitive'] = self::isSensitive($item['id']);
1075                 $data['context'] = self::fetchContextURLForItem($item);
1076
1077                 if (!empty($item['title'])) {
1078                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1079                 }
1080
1081                 $permission_block = self::createPermissionBlockForItem($item, false);
1082
1083                 $body = $item['body'];
1084
1085                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1086                         $body = self::prependMentions($body, $permission_block);
1087                 }
1088
1089                 if ($type == 'Note') {
1090                         $body = self::removePictures($body);
1091                 } elseif (($type == 'Article') && empty($data['summary'])) {
1092                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1093                 }
1094
1095                 if ($type == 'Event') {
1096                         $data = array_merge($data, self::createEvent($item));
1097                 } else {
1098                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1099                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1100
1101                         $data['content'] = BBCode::convert($body, false, 7);
1102                 }
1103
1104                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1105
1106                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1107                         $data['diaspora:comment'] = $item['signed_text'];
1108                 }
1109
1110                 $data['attachment'] = self::createAttachmentList($item, $type);
1111                 $data['tag'] = self::createTagList($item);
1112
1113                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1114                         $data['location'] = self::createLocation($item);
1115                 }
1116
1117                 if (!empty($item['app'])) {
1118                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1119                 }
1120
1121                 $data = array_merge($data, $permission_block);
1122
1123                 return $data;
1124         }
1125
1126         /**
1127          * Creates an announce object entry
1128          *
1129          * @param array $item
1130          * @param array $data activity data
1131          *
1132          * @return array with activity data
1133          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1134          * @throws \ImagickException
1135          */
1136         private static function createAnnounce($item, $data)
1137         {
1138                 $announce = api_share_as_retweet($item);
1139                 if (empty($announce['plink'])) {
1140                         $data['type'] = 'Create';
1141                         $data['object'] = self::createNote($item);
1142                         return $data;
1143                 }
1144
1145                 // Fetch the original id of the object
1146                 $activity = ActivityPub::fetchContent($announce['plink'], $item['uid']);
1147                 if (!empty($activity)) {
1148                         $ldactivity = JsonLD::compact($activity);
1149                         $id = JsonLD::fetchElement($ldactivity, '@id');
1150                         if (!empty($id)) {
1151                                 $data['object'] = $id;
1152                                 return $data;
1153                         }
1154                 }
1155
1156                 $data['type'] = 'Create';
1157                 $data['object'] = self::createNote($item);
1158                 return $data;
1159         }
1160
1161         /**
1162          * Creates an activity id for a given contact id
1163          *
1164          * @param integer $cid Contact ID of target
1165          *
1166          * @return bool|string activity id
1167          */
1168         public static function activityIDFromContact($cid)
1169         {
1170                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1171                 if (!DBA::isResult($contact)) {
1172                         return false;
1173                 }
1174
1175                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1176                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1177                 return System::baseUrl() . '/activity/' . $uuid;
1178         }
1179
1180         /**
1181          * Transmits a contact suggestion to a given inbox
1182          *
1183          * @param integer $uid           User ID
1184          * @param string  $inbox         Target inbox
1185          * @param integer $suggestion_id Suggestion ID
1186          *
1187          * @return boolean was the transmission successful?
1188          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1189          */
1190         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1191         {
1192                 $owner = User::getOwnerDataById($uid);
1193
1194                 $suggestion = DBA::selectFirst('fsuggest', ['url', 'note', 'created'], ['id' => $suggestion_id]);
1195
1196                 $data = ['@context' => ActivityPub::CONTEXT,
1197                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1198                         'type' => 'Announce',
1199                         'actor' => $owner['url'],
1200                         'object' => $suggestion['url'],
1201                         'content' => $suggestion['note'],
1202                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1203                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1204                         'cc' => []];
1205
1206                 $signed = LDSignature::sign($data, $owner);
1207
1208                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1209                 return HTTPSignature::transmit($signed, $inbox, $uid);
1210         }
1211
1212         /**
1213          * Transmits a profile relocation to a given inbox
1214          *
1215          * @param integer $uid   User ID
1216          * @param string  $inbox Target inbox
1217          *
1218          * @return boolean was the transmission successful?
1219          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1220          */
1221         public static function sendProfileRelocation($uid, $inbox)
1222         {
1223                 $owner = User::getOwnerDataById($uid);
1224
1225                 $data = ['@context' => ActivityPub::CONTEXT,
1226                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1227                         'type' => 'dfrn:relocate',
1228                         'actor' => $owner['url'],
1229                         'object' => $owner['url'],
1230                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1231                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1232                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1233                         'cc' => []];
1234
1235                 $signed = LDSignature::sign($data, $owner);
1236
1237                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1238                 return HTTPSignature::transmit($signed, $inbox, $uid);
1239         }
1240
1241         /**
1242          * Transmits a profile deletion to a given inbox
1243          *
1244          * @param integer $uid   User ID
1245          * @param string  $inbox Target inbox
1246          *
1247          * @return boolean was the transmission successful?
1248          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1249          */
1250         public static function sendProfileDeletion($uid, $inbox)
1251         {
1252                 $owner = User::getOwnerDataById($uid);
1253
1254                 if (empty($owner)) {
1255                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1256                         return false;
1257                 }
1258
1259                 if (empty($owner['uprvkey'])) {
1260                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1261                         return false;
1262                 }
1263
1264                 $data = ['@context' => ActivityPub::CONTEXT,
1265                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1266                         'type' => 'Delete',
1267                         'actor' => $owner['url'],
1268                         'object' => $owner['url'],
1269                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1270                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1271                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1272                         'cc' => []];
1273
1274                 $signed = LDSignature::sign($data, $owner);
1275
1276                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1277                 return HTTPSignature::transmit($signed, $inbox, $uid);
1278         }
1279
1280         /**
1281          * Transmits a profile change to a given inbox
1282          *
1283          * @param integer $uid   User ID
1284          * @param string  $inbox Target inbox
1285          *
1286          * @return boolean was the transmission successful?
1287          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1288          * @throws \ImagickException
1289          */
1290         public static function sendProfileUpdate($uid, $inbox)
1291         {
1292                 $owner = User::getOwnerDataById($uid);
1293                 $profile = APContact::getByURL($owner['url']);
1294
1295                 $data = ['@context' => ActivityPub::CONTEXT,
1296                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1297                         'type' => 'Update',
1298                         'actor' => $owner['url'],
1299                         'object' => self::getProfile($uid),
1300                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1301                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1302                         'to' => [$profile['followers']],
1303                         'cc' => []];
1304
1305                 $signed = LDSignature::sign($data, $owner);
1306
1307                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1308                 return HTTPSignature::transmit($signed, $inbox, $uid);
1309         }
1310
1311         /**
1312          * Transmits a given activity to a target
1313          *
1314          * @param string  $activity Type name
1315          * @param string  $target   Target profile
1316          * @param integer $uid      User ID
1317          * @return bool
1318          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1319          * @throws \ImagickException
1320          * @throws \Exception
1321          */
1322         public static function sendActivity($activity, $target, $uid, $id = '')
1323         {
1324                 $profile = APContact::getByURL($target);
1325
1326                 $owner = User::getOwnerDataById($uid);
1327
1328                 if (empty($id)) {
1329                         $id = System::baseUrl() . '/activity/' . System::createGUID();
1330                 }
1331
1332                 $data = ['@context' => ActivityPub::CONTEXT,
1333                         'id' => $id,
1334                         'type' => $activity,
1335                         'actor' => $owner['url'],
1336                         'object' => $profile['url'],
1337                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1338                         'to' => [$profile['url']]];
1339
1340                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1341
1342                 $signed = LDSignature::sign($data, $owner);
1343                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1344         }
1345
1346         /**
1347          * Transmits a "follow object" activity to a target
1348          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1349          *
1350          * @param string  $object Object URL
1351          * @param string  $target Target profile
1352          * @param integer $uid    User ID
1353          * @return bool
1354          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1355          * @throws \ImagickException
1356          * @throws \Exception
1357          */
1358         public static function sendFollowObject($object, $target, $uid = 0)
1359         {
1360                 $profile = APContact::getByURL($target);
1361
1362                 if (empty($uid)) {
1363                         // Fetch the list of administrators
1364                         $admin_mail = explode(',', str_replace(' ', '', Config::get('config', 'admin_email')));
1365
1366                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1367                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1368                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1369                         $uid = $first_user['uid'];
1370                 }
1371
1372                 $condition = ['verb' => ACTIVITY_FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1373                         'author-id' => Contact::getPublicIdByUserId($uid)];
1374                 if (Item::exists($condition)) {
1375                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1376                         return false;
1377                 }
1378
1379                 $owner = User::getOwnerDataById($uid);
1380
1381                 $data = ['@context' => ActivityPub::CONTEXT,
1382                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1383                         'type' => 'Follow',
1384                         'actor' => $owner['url'],
1385                         'object' => $object,
1386                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1387                         'to' => [$profile['url']]];
1388
1389                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1390
1391                 $signed = LDSignature::sign($data, $owner);
1392                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1393         }
1394
1395         /**
1396          * Transmit a message that the contact request had been accepted
1397          *
1398          * @param string  $target Target profile
1399          * @param         $id
1400          * @param integer $uid    User ID
1401          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1402          * @throws \ImagickException
1403          */
1404         public static function sendContactAccept($target, $id, $uid)
1405         {
1406                 $profile = APContact::getByURL($target);
1407
1408                 $owner = User::getOwnerDataById($uid);
1409                 $data = ['@context' => ActivityPub::CONTEXT,
1410                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1411                         'type' => 'Accept',
1412                         'actor' => $owner['url'],
1413                         'object' => ['id' => $id, 'type' => 'Follow',
1414                                 'actor' => $profile['url'],
1415                                 'object' => $owner['url']],
1416                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1417                         'to' => [$profile['url']]];
1418
1419                 Logger::log('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1420
1421                 $signed = LDSignature::sign($data, $owner);
1422                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1423         }
1424
1425         /**
1426          * Reject a contact request or terminates the contact relation
1427          *
1428          * @param string  $target Target profile
1429          * @param         $id
1430          * @param integer $uid    User ID
1431          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1432          * @throws \ImagickException
1433          */
1434         public static function sendContactReject($target, $id, $uid)
1435         {
1436                 $profile = APContact::getByURL($target);
1437
1438                 $owner = User::getOwnerDataById($uid);
1439                 $data = ['@context' => ActivityPub::CONTEXT,
1440                         'id' => System::baseUrl() . '/activity/' . System::createGUID(),
1441                         'type' => 'Reject',
1442                         'actor' => $owner['url'],
1443                         'object' => ['id' => $id, 'type' => 'Follow',
1444                                 'actor' => $profile['url'],
1445                                 'object' => $owner['url']],
1446                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1447                         'to' => [$profile['url']]];
1448
1449                 Logger::log('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1450
1451                 $signed = LDSignature::sign($data, $owner);
1452                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1453         }
1454
1455         /**
1456          * Transmits a message that we don't want to follow this contact anymore
1457          *
1458          * @param string  $target Target profile
1459          * @param integer $uid    User ID
1460          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1461          * @throws \ImagickException
1462          * @throws \Exception
1463          */
1464         public static function sendContactUndo($target, $cid, $uid)
1465         {
1466                 $profile = APContact::getByURL($target);
1467
1468                 $object_id = self::activityIDFromContact($cid);
1469                 if (empty($object_id)) {
1470                         return;
1471                 }
1472
1473                 $id = System::baseUrl() . '/activity/' . System::createGUID();
1474
1475                 $owner = User::getOwnerDataById($uid);
1476                 $data = ['@context' => ActivityPub::CONTEXT,
1477                         'id' => $id,
1478                         'type' => 'Undo',
1479                         'actor' => $owner['url'],
1480                         'object' => ['id' => $object_id, 'type' => 'Follow',
1481                                 'actor' => $owner['url'],
1482                                 'object' => $profile['url']],
1483                         'instrument' => ['type' => 'Service', 'name' => BaseObject::getApp()->getUserAgent()],
1484                         'to' => [$profile['url']]];
1485
1486                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1487
1488                 $signed = LDSignature::sign($data, $owner);
1489                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1490         }
1491
1492         private static function prependMentions($body, array $permission_block)
1493         {
1494                 if (Config::get('system', 'disable_implicit_mentions')) {
1495                         return $body;
1496                 }
1497
1498                 $mentions = [];
1499
1500                 foreach ($permission_block['to'] as $profile_url) {
1501                         $profile = Contact::getDetailsByURL($profile_url);
1502                         if (!empty($profile['addr'])
1503                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1504                                 && !strstr($body, $profile['addr'])
1505                                 && !strstr($body, $profile_url)
1506                         ) {
1507                                 $mentions[] = '@[url=' . $profile_url . ']' . $profile['nick'] . '[/url]';
1508                         }
1509                 }
1510
1511                 $mentions[] = $body;
1512
1513                 return implode(' ', $mentions);
1514         }
1515 }