src/Model/APContact.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use Friendica\Content\Text\HTML;
  25 use Friendica\Core\Cache\Enum\Duration;
  26 use Friendica\Core\Logger;
  27 use Friendica\Core\System;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Network\HTTPClient\Client\HttpClientAccept;
  31 use Friendica\Network\HTTPException;
  32 use Friendica\Network\Probe;
  33 use Friendica\Protocol\ActivityNamespace;
  34 use Friendica\Protocol\ActivityPub;
  35 use Friendica\Protocol\ActivityPub\Transmitter;
  36 use Friendica\Util\Crypto;
  37 use Friendica\Util\DateTimeFormat;
  38 use Friendica\Util\HTTPSignature;
  39 use Friendica\Util\JsonLD;
  40 use Friendica\Util\Network;
  41
  42 class APContact
  43 {
  44         /**
  45          * Fetch webfinger data
  46          *
  47          * @param string $addr Address
  48          * @return array webfinger data
  49          */
  50         private static function fetchWebfingerData(string $addr): array
  51         {
  52                 $addr_parts = explode('@', $addr);
  53                 if (count($addr_parts) != 2) {
  54                         return [];
  55                 }
  56
  57                 if (Contact::isLocal($addr) && ($local_uid = User::getIdForURL($addr)) && ($local_owner = User::getOwnerDataById($local_uid))) {
  58                         $data = [
  59                                 'addr'      => $local_owner['addr'],
  60                                 'baseurl'   => $local_owner['baseurl'],
  61                                 'url'       => $local_owner['url'],
  62                                 'subscribe' => $local_owner['baseurl'] . '/follow?url={uri}'];
  63
  64                         if (!empty($local_owner['alias']) && ($local_owner['url'] != $local_owner['alias'])) {
  65                                 $data['alias'] = $local_owner['alias'];
  66                         }
  67
  68                         return $data;
  69                 }
  70
  71                 $data = ['addr' => $addr];
  72                 $template = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
  73                 $webfinger = Probe::webfinger(str_replace('{uri}', urlencode($addr), $template), HttpClientAccept::JRD_JSON);
  74                 if (empty($webfinger['links'])) {
  75                         $template = 'http://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
  76                         $webfinger = Probe::webfinger(str_replace('{uri}', urlencode($addr), $template), HttpClientAccept::JRD_JSON);
  77                         if (empty($webfinger['links'])) {
  78                                 return [];
  79                         }
  80                         $data['baseurl'] = 'http://' . $addr_parts[1];
  81                 } else {
  82                         $data['baseurl'] = 'https://' . $addr_parts[1];
  83                 }
  84
  85                 foreach ($webfinger['links'] as $link) {
  86                         if (empty($link['rel'])) {
  87                                 continue;
  88                         }
  89
  90                         if (!empty($link['template']) && ($link['rel'] == ActivityNamespace::OSTATUSSUB)) {
  91                                 $data['subscribe'] = $link['template'];
  92                         }
  93
  94                         if (!empty($link['href']) && !empty($link['type']) && ($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
  95                                 $data['url'] = $link['href'];
  96                         }
  97
  98                         if (!empty($link['href']) && !empty($link['type']) && ($link['rel'] == 'http://webfinger.net/rel/profile-page') && ($link['type'] == 'text/html')) {
  99                                 $data['alias'] = $link['href'];
 100                         }
 101                 }
 102
 103                 if (!empty($data['url']) && !empty($data['alias']) && ($data['url'] == $data['alias'])) {
 104                         unset($data['alias']);
 105                 }
 106
 107                 return $data;
 108         }
 109
 110         /**
 111          * Fetches a profile from a given url
 112          *
 113          * @param string  $url    profile url
 114          * @param boolean $update true = always update, false = never update, null = update when not found or outdated
 115          * @return array profile array
 116          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 117          * @throws \ImagickException
 118          * @todo Rewrite parameter $update to avoid true|false|null (boolean is binary, null adds a third case)
 119          */
 120         public static function getByURL(string $url, $update = null): array
 121         {
 122                 if (empty($url) || Network::isUrlBlocked($url)) {
 123                         Logger::info('Domain is blocked', ['url' => $url]);
 124                         return [];
 125                 }
 126
 127                 $fetched_contact = [];
 128
 129                 if (empty($update)) {
 130                         if (is_null($update)) {
 131                                 $ref_update = DateTimeFormat::utc('now - 1 month');
 132                         } else {
 133                                 $ref_update = DBA::NULL_DATETIME;
 134                         }
 135
 136                         $apcontact = DBA::selectFirst('apcontact', [], ['url' => $url]);
 137                         if (!DBA::isResult($apcontact)) {
 138                                 $apcontact = DBA::selectFirst('apcontact', [], ['alias' => $url]);
 139                         }
 140
 141                         if (!DBA::isResult($apcontact)) {
 142                                 $apcontact = DBA::selectFirst('apcontact', [], ['addr' => $url]);
 143                         }
 144
 145                         if (DBA::isResult($apcontact) && ($apcontact['updated'] > $ref_update) && !empty($apcontact['pubkey']) && !empty($apcontact['uri-id'])) {
 146                                 return $apcontact;
 147                         }
 148
 149                         if (!is_null($update)) {
 150                                 return DBA::isResult($apcontact) ? $apcontact : [];
 151                         }
 152
 153                         if (DBA::isResult($apcontact)) {
 154                                 $fetched_contact = $apcontact;
 155                         }
 156                 }
 157
 158                 $apcontact = [];
 159
 160                 $webfinger = empty(parse_url($url, PHP_URL_SCHEME));
 161                 if ($webfinger) {
 162                         $apcontact = self::fetchWebfingerData($url);
 163                         if (empty($apcontact['url'])) {
 164                                 return $fetched_contact;
 165                         }
 166                         $url = $apcontact['url'];
 167                 } elseif (empty(parse_url($url, PHP_URL_PATH))) {
 168                         $apcontact['baseurl'] = $url;
 169                 }
 170
 171                 // Detect multiple fast repeating request to the same address
 172                 // See https://github.com/friendica/friendica/issues/9303
 173                 $cachekey = 'apcontact:' . ItemURI::getIdByURI($url);
 174                 $result = DI::cache()->get($cachekey);
 175                 if (!is_null($result)) {
 176                         Logger::notice('Multiple requests for the address', ['url' => $url, 'update' => $update, 'callstack' => System::callstack(20), 'result' => $result]);
 177                         if (!empty($fetched_contact)) {
 178                                 return $fetched_contact;
 179                         }
 180                 } else {
 181                         DI::cache()->set($cachekey, System::callstack(20), Duration::FIVE_MINUTES);
 182                 }
 183
 184                 if (Network::isLocalLink($url) && ($local_uid = User::getIdForURL($url))) {
 185                         try {
 186                                 $data = Transmitter::getProfile($local_uid);
 187                                 $local_owner = User::getOwnerDataById($local_uid);
 188                         } catch(HTTPException\NotFoundException $e) {
 189                                 $data = null;
 190                         }
 191                 }
 192
 193                 if (empty($data)) {
 194                         $local_owner = [];
 195
 196                         $curlResult = HTTPSignature::fetchRaw($url);
 197                         $failed = empty($curlResult) || empty($curlResult->getBody()) ||
 198                                 (!$curlResult->isSuccess() && ($curlResult->getReturnCode() != 410));
 199
 200                         if (!$failed) {
 201                                 $data = json_decode($curlResult->getBody(), true);
 202                                 $failed = empty($data) || !is_array($data);
 203                         }
 204
 205                         if (!$failed && ($curlResult->getReturnCode() == 410)) {
 206                                 $data = ['@context' => ActivityPub::CONTEXT, 'id' => $url, 'type' => 'Tombstone'];
 207                         }
 208
 209                         if ($failed) {
 210                                 self::markForArchival($fetched_contact ?: []);
 211                                 return $fetched_contact;
 212                         }
 213                 }
 214
 215                 $compacted = JsonLD::compact($data);
 216                 if (empty($compacted['@id'])) {
 217                         return $fetched_contact;
 218                 }
 219
 220                 $apcontact['url'] = $compacted['@id'];
 221                 $apcontact['uuid'] = JsonLD::fetchElement($compacted, 'diaspora:guid', '@value');
 222                 $apcontact['type'] = str_replace('as:', '', JsonLD::fetchElement($compacted, '@type'));
 223                 $apcontact['following'] = JsonLD::fetchElement($compacted, 'as:following', '@id');
 224                 $apcontact['followers'] = JsonLD::fetchElement($compacted, 'as:followers', '@id');
 225                 $apcontact['inbox'] = (JsonLD::fetchElement($compacted, 'ldp:inbox', '@id') ?? '');
 226                 self::unarchiveInbox($apcontact['inbox'], false);
 227
 228                 $apcontact['outbox'] = JsonLD::fetchElement($compacted, 'as:outbox', '@id');
 229
 230                 $apcontact['sharedinbox'] = '';
 231                 if (!empty($compacted['as:endpoints'])) {
 232                         $apcontact['sharedinbox'] = (JsonLD::fetchElement($compacted['as:endpoints'], 'as:sharedInbox', '@id') ?? '');
 233                         self::unarchiveInbox($apcontact['sharedinbox'], true);
 234                 }
 235
 236                 $apcontact['featured']      = JsonLD::fetchElement($compacted, 'toot:featured', '@id');
 237                 $apcontact['featured-tags'] = JsonLD::fetchElement($compacted, 'toot:featuredTags', '@id');
 238
 239                 $apcontact['nick'] = JsonLD::fetchElement($compacted, 'as:preferredUsername', '@value') ?? '';
 240                 $apcontact['name'] = JsonLD::fetchElement($compacted, 'as:name', '@value');
 241
 242                 if (empty($apcontact['name'])) {
 243                         $apcontact['name'] = $apcontact['nick'];
 244                 }
 245
 246                 $apcontact['about'] = HTML::toBBCode(JsonLD::fetchElement($compacted, 'as:summary', '@value') ?? '');
 247
 248                 $ims = JsonLD::fetchElementArray($compacted, 'vcard:hasInstantMessage');
 249
 250                 if (!empty($ims)) {
 251                         foreach ($ims as $link) {
 252                                 if (substr($link, 0, 5) == 'xmpp:') {
 253                                         $apcontact['xmpp'] = substr($link, 5);
 254                                 }
 255                                 if (substr($link, 0, 7) == 'matrix:') {
 256                                         $apcontact['matrix'] = substr($link, 7);
 257                                 }
 258                         }
 259                 }
 260
 261                 $apcontact['photo'] = JsonLD::fetchElement($compacted, 'as:icon', '@id');
 262                 if (is_array($apcontact['photo']) || !empty($compacted['as:icon']['as:url']['@id'])) {
 263                         $apcontact['photo'] = JsonLD::fetchElement($compacted['as:icon'], 'as:url', '@id');
 264                 }
 265
 266                 $apcontact['header'] = JsonLD::fetchElement($compacted, 'as:image', '@id');
 267                 if (is_array($apcontact['header']) || !empty($compacted['as:image']['as:url']['@id'])) {
 268                         $apcontact['header'] = JsonLD::fetchElement($compacted['as:image'], 'as:url', '@id');
 269                 }
 270
 271                 if (empty($apcontact['alias'])) {
 272                         $apcontact['alias'] = JsonLD::fetchElement($compacted, 'as:url', '@id');
 273                         if (is_array($apcontact['alias'])) {
 274                                 $apcontact['alias'] = JsonLD::fetchElement($compacted['as:url'], 'as:href', '@id');
 275                         }
 276                 }
 277
 278                 // Quit if none of the basic values are set
 279                 if (empty($apcontact['url']) || empty($apcontact['type']) || (($apcontact['type'] != 'Tombstone') && empty($apcontact['inbox']))) {
 280                         return $fetched_contact;
 281                 } elseif ($apcontact['type'] == 'Tombstone') {
 282                         // The "inbox" field must have a content
 283                         $apcontact['inbox'] = '';
 284                 }
 285
 286                 // Quit if this doesn't seem to be an account at all
 287                 if (!in_array($apcontact['type'], ActivityPub::ACCOUNT_TYPES)) {
 288                         return $fetched_contact;
 289                 }
 290
 291                 $parts = parse_url($apcontact['url']);
 292                 unset($parts['scheme']);
 293                 unset($parts['path']);
 294
 295                 if (empty($apcontact['addr'])) {
 296                         if (!empty($apcontact['nick']) && is_array($parts)) {
 297                                 $apcontact['addr'] = $apcontact['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 298                         } else {
 299                                 $apcontact['addr'] = '';
 300                         }
 301                 }
 302
 303                 $apcontact['pubkey'] = null;
 304                 if (!empty($compacted['w3id:publicKey'])) {
 305                         $apcontact['pubkey'] = trim(JsonLD::fetchElement($compacted['w3id:publicKey'], 'w3id:publicKeyPem', '@value'));
 306                         if (strstr($apcontact['pubkey'], 'RSA ')) {
 307                                 $apcontact['pubkey'] = Crypto::rsaToPem($apcontact['pubkey']);
 308                         }
 309                 }
 310
 311                 $apcontact['manually-approve'] = (int)JsonLD::fetchElement($compacted, 'as:manuallyApprovesFollowers');
 312
 313                 if (!empty($compacted['as:generator'])) {
 314                         $apcontact['baseurl'] = JsonLD::fetchElement($compacted['as:generator'], 'as:url', '@id');
 315                         $apcontact['generator'] = JsonLD::fetchElement($compacted['as:generator'], 'as:name', '@value');
 316                 }
 317
 318                 if (!empty($apcontact['following'])) {
 319                         if (!empty($local_owner)) {
 320                                 $following = ActivityPub\Transmitter::getContacts($local_owner, [Contact::SHARING, Contact::FRIEND], 'following');
 321                         } else {
 322                                 $following = ActivityPub::fetchContent($apcontact['following']);
 323                         }
 324                         if (!empty($following['totalItems'])) {
 325                                 // Mastodon seriously allows for this condition?
 326                                 // Jul 14 2021 - See https://mastodon.social/@BLUW for a negative following count
 327                                 if ($following['totalItems'] < 0) {
 328                                         $following['totalItems'] = 0;
 329                                 }
 330                                 $apcontact['following_count'] = $following['totalItems'];
 331                         }
 332                 }
 333
 334                 if (!empty($apcontact['followers'])) {
 335                         if (!empty($local_owner)) {
 336                                 $followers = ActivityPub\Transmitter::getContacts($local_owner, [Contact::FOLLOWER, Contact::FRIEND], 'followers');
 337                         } else {
 338                                 $followers = ActivityPub::fetchContent($apcontact['followers']);
 339                         }
 340                         if (!empty($followers['totalItems'])) {
 341                                 // Mastodon seriously allows for this condition?
 342                                 // Jul 14 2021 - See https://mastodon.online/@goes11 for a negative followers count
 343                                 if ($followers['totalItems'] < 0) {
 344                                         $followers['totalItems'] = 0;
 345                                 }
 346                                 $apcontact['followers_count'] = $followers['totalItems'];
 347                         }
 348                 }
 349
 350                 if (!empty($apcontact['outbox'])) {
 351                         if (!empty($local_owner)) {
 352                                 $outbox = ActivityPub\Transmitter::getOutbox($local_owner);
 353                         } else {
 354                                 $outbox = ActivityPub::fetchContent($apcontact['outbox']);
 355                         }
 356                         if (!empty($outbox['totalItems'])) {
 357                                 // Mastodon seriously allows for this condition?
 358                                 // Jul 20 2021 - See https://chaos.social/@m11 for a negative posts count
 359                                 if ($outbox['totalItems'] < 0) {
 360                                         $outbox['totalItems'] = 0;
 361                                 }
 362                                 $apcontact['statuses_count'] = $outbox['totalItems'];
 363                         }
 364                 }
 365
 366                 $apcontact['discoverable'] = JsonLD::fetchElement($compacted, 'toot:discoverable', '@value');
 367
 368                 // To-Do
 369
 370                 // Unhandled
 371                 // tag, attachment, image, nomadicLocations, signature, movedTo, liked
 372
 373                 // Unhandled from Misskey
 374                 // sharedInbox, isCat
 375
 376                 // Unhandled from Kroeg
 377                 // kroeg:blocks, updated
 378
 379                 // When the photo is too large, try to shorten it by removing parts
 380                 if (strlen($apcontact['photo']) > 255) {
 381                         $parts = parse_url($apcontact['photo']);
 382                         unset($parts['fragment']);
 383                         $apcontact['photo'] = Network::unparseURL($parts);
 384
 385                         if (strlen($apcontact['photo']) > 255) {
 386                                 unset($parts['query']);
 387                                 $apcontact['photo'] = Network::unparseURL($parts);
 388                         }
 389
 390                         if (strlen($apcontact['photo']) > 255) {
 391                                 $apcontact['photo'] = substr($apcontact['photo'], 0, 255);
 392                         }
 393                 }
 394
 395                 if (!$webfinger && !empty($apcontact['addr'])) {
 396                         $data = self::fetchWebfingerData($apcontact['addr']);
 397                         if (!empty($data)) {
 398                                 $apcontact['baseurl'] = $data['baseurl'];
 399
 400                                 if (empty($apcontact['alias']) && !empty($data['alias'])) {
 401                                         $apcontact['alias'] = $data['alias'];
 402                                 }
 403                                 if (!empty($data['subscribe'])) {
 404                                         $apcontact['subscribe'] = $data['subscribe'];
 405                                 }
 406                         } else {
 407                                 $apcontact['addr'] = null;
 408                         }
 409                 }
 410
 411                 if (empty($apcontact['baseurl'])) {
 412                         $apcontact['baseurl'] = null;
 413                 }
 414
 415                 if (empty($apcontact['subscribe'])) {
 416                         $apcontact['subscribe'] = null;
 417                 }
 418
 419                 if (!empty($apcontact['baseurl']) && empty($fetched_contact['gsid'])) {
 420                         $apcontact['gsid'] = GServer::getID($apcontact['baseurl']);
 421                 } elseif (!empty($fetched_contact['gsid'])) {
 422                         $apcontact['gsid'] = $fetched_contact['gsid'];
 423                 } else {
 424                         $apcontact['gsid'] = null;
 425                 }
 426
 427                 if ($apcontact['url'] == $apcontact['alias']) {
 428                         $apcontact['alias'] = null;
 429                 }
 430
 431                 if (empty($apcontact['uuid'])) {
 432                         $apcontact['uri-id'] = ItemURI::getIdByURI($apcontact['url']);
 433                 } else {
 434                         $apcontact['uri-id'] = ItemURI::insert(['uri' => $apcontact['url'], 'guid' => $apcontact['uuid']]);
 435                 }
 436
 437                 foreach (APContact\Endpoint::ENDPOINT_NAMES as $type => $name) {
 438                         $value = JsonLD::fetchElement($compacted, $name, '@id');
 439                         if (empty($value)) {
 440                                 continue;
 441                         }
 442                         APContact\Endpoint::update($apcontact['uri-id'], $type, $value);
 443                 }
 444
 445                 if (!empty($compacted['as:endpoints'])) {
 446                         foreach ($compacted['as:endpoints'] as $name => $endpoint) {
 447                                 if (empty($endpoint['@id']) || !is_string($endpoint['@id'])) {
 448                                         continue;
 449                                 }
 450
 451                                 if (in_array($name, APContact\Endpoint::ENDPOINT_NAMES)) {
 452                                         $key = array_search($name, APContact\Endpoint::ENDPOINT_NAMES);
 453                                         APContact\Endpoint::update($apcontact['uri-id'], $key, $endpoint['@id']);
 454                                         Logger::debug('Store endpoint', ['key' => $key, 'name' => $name, 'endpoint' => $endpoint['@id']]);
 455                                 } elseif (!in_array($name, ['as:sharedInbox', 'as:uploadMedia', 'as:oauthTokenEndpoint', 'as:oauthAuthorizationEndpoint', 'litepub:oauthRegistrationEndpoint'])) {
 456                                         Logger::debug('Unknown endpoint', ['name' => $name, 'endpoint' => $endpoint['@id']]);
 457                                 }
 458                         }
 459                 }
 460
 461                 $apcontact['updated'] = DateTimeFormat::utcNow();
 462
 463                 // We delete the old entry when the URL is changed
 464                 if ($url != $apcontact['url']) {
 465                         Logger::info('Delete changed profile url', ['old' => $url, 'new' => $apcontact['url']]);
 466                         DBA::delete('apcontact', ['url' => $url]);
 467                 }
 468
 469                 // Limit the length on incoming fields
 470                 $apcontact = DI::dbaDefinition()->truncateFieldsForTable('apcontact', $apcontact);
 471
 472                 if (DBA::exists('apcontact', ['url' => $apcontact['url']])) {
 473                         DBA::update('apcontact', $apcontact, ['url' => $apcontact['url']]);
 474                 } else {
 475                         DBA::replace('apcontact', $apcontact);
 476                 }
 477
 478                 Logger::info('Updated profile', ['url' => $url]);
 479
 480                 return DBA::selectFirst('apcontact', [], ['url' => $apcontact['url']]) ?: [];
 481         }
 482
 483         /**
 484          * Mark the given AP Contact as "to archive"
 485          *
 486          * @param array $apcontact
 487          * @return void
 488          */
 489         public static function markForArchival(array $apcontact)
 490         {
 491                 if (!empty($apcontact['inbox'])) {
 492                         Logger::info('Set inbox status to failure', ['inbox' => $apcontact['inbox']]);
 493                         HTTPSignature::setInboxStatus($apcontact['inbox'], false);
 494                 }
 495
 496                 if (!empty($apcontact['sharedinbox'])) {
 497                         // Check if there are any available inboxes
 498                         $available = DBA::exists('apcontact', ["`sharedinbox` = ? AnD `inbox` IN (SELECT `url` FROM `inbox-status` WHERE `success` > `failure`)",
 499                                 $apcontact['sharedinbox']]);
 500                         if (!$available) {
 501                                 // If all known personal inboxes are failing then set their shared inbox to failure as well
 502                                 Logger::info('Set shared inbox status to failure', ['sharedinbox' => $apcontact['sharedinbox']]);
 503                                 HTTPSignature::setInboxStatus($apcontact['sharedinbox'], false, true);
 504                         }
 505                 }
 506         }
 507
 508         /**
 509          * Unmark the given AP Contact as "to archive"
 510          *
 511          * @param array $apcontact
 512          * @return void
 513          */
 514         public static function unmarkForArchival(array $apcontact)
 515         {
 516                 if (!empty($apcontact['inbox'])) {
 517                         Logger::info('Set inbox status to success', ['inbox' => $apcontact['inbox']]);
 518                         HTTPSignature::setInboxStatus($apcontact['inbox'], true);
 519                 }
 520                 if (!empty($apcontact['sharedinbox'])) {
 521                         Logger::info('Set shared inbox status to success', ['sharedinbox' => $apcontact['sharedinbox']]);
 522                         HTTPSignature::setInboxStatus($apcontact['sharedinbox'], true, true);
 523                 }
 524         }
 525
 526         /**
 527          * Unarchive inboxes
 528          *
 529          * @param string  $url    inbox url
 530          * @param boolean $shared Shared Inbox
 531          * @return void
 532          */
 533         private static function unarchiveInbox(string $url, bool $shared)
 534         {
 535                 if (empty($url)) {
 536                         return;
 537                 }
 538
 539                 HTTPSignature::setInboxStatus($url, true, $shared);
 540         }
 541
 542         /**
 543          * Check if the apcontact is a relay account
 544          *
 545          * @param array $apcontact
 546          *
 547          * @return bool
 548          */
 549         public static function isRelay(array $apcontact): bool
 550         {
 551                 if ($apcontact['nick'] != 'relay') {
 552                         return false;
 553                 }
 554
 555                 if ($apcontact['type'] == 'Application') {
 556                         return true;
 557                 }
 558
 559                 if (in_array($apcontact['type'], ['Group', 'Service']) && is_null($apcontact['outbox'])) {
 560                         return true;
 561                 }
 562
 563                 return false;
 564         }
 565 }