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