src/Model/GServer.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 DOMDocument;
  25 use DOMXPath;
  26 use Exception;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\System;
  30 use Friendica\Core\Worker;
  31 use Friendica\Database\Database;
  32 use Friendica\Database\DBA;
  33 use Friendica\DI;
  34 use Friendica\Module\Register;
  35 use Friendica\Network\HTTPClient\Client\HttpClientOptions;
  36 use Friendica\Network\HTTPClient\Capability\ICanHandleHttpResponses;
  37 use Friendica\Protocol\Relay;
  38 use Friendica\Util\DateTimeFormat;
  39 use Friendica\Util\Network;
  40 use Friendica\Util\Strings;
  41 use Friendica\Util\XML;
  42
  43 /**
  44  * This class handles GServer related functions
  45  */
  46 class GServer
  47 {
  48         // Directory types
  49         const DT_NONE = 0;
  50         const DT_POCO = 1;
  51         const DT_MASTODON = 2;
  52
  53         // Methods to detect server types
  54
  55         // Non endpoint specific methods
  56         const DETECT_MANUAL = 0;
  57         const DETECT_HEADER = 1;
  58         const DETECT_BODY = 2;
  59
  60         // Implementation specific endpoints
  61         const DETECT_FRIENDIKA = 10;
  62         const DETECT_FRIENDICA = 11;
  63         const DETECT_STATUSNET = 12;
  64         const DETECT_GNUSOCIAL = 13;
  65         const DETECT_CONFIG_JSON = 14; // Statusnet, GNU Social, Older Hubzilla/Redmatrix
  66         const DETECT_SITEINFO_JSON = 15; // Newer Hubzilla
  67         const DETECT_MASTODON_API = 16;
  68         const DETECT_STATUS_PHP = 17; // Nextcloud
  69         const DETECT_V1_CONFIG = 18;
  70
  71         // Standardized endpoints
  72         const DETECT_STATISTICS_JSON = 100;
  73         const DETECT_NODEINFO_1 = 101;
  74         const DETECT_NODEINFO_2 = 102;
  75
  76         /**
  77          * Check for the existance of a server and adds it in the background if not existant
  78          *
  79          * @param string $url
  80          * @param boolean $only_nodeinfo
  81          * @return void
  82          */
  83         public static function add(string $url, bool $only_nodeinfo = false)
  84         {
  85                 if (self::getID($url, false)) {
  86                         return;
  87                 }
  88
  89                 Worker::add(PRIORITY_LOW, 'UpdateGServer', $url, $only_nodeinfo);
  90         }
  91
  92         /**
  93          * Get the ID for the given server URL
  94          *
  95          * @param string $url
  96          * @param boolean $no_check Don't check if the server hadn't been found
  97          * @return int gserver id
  98          */
  99         public static function getID(string $url, bool $no_check = false)
 100         {
 101                 if (empty($url)) {
 102                         return null;
 103                 }
 104
 105                 $url = self::cleanURL($url);
 106
 107                 $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => Strings::normaliseLink($url)]);
 108                 if (DBA::isResult($gserver)) {
 109                         Logger::info('Got ID for URL', ['id' => $gserver['id'], 'url' => $url, 'callstack' => System::callstack(20)]);
 110                         return $gserver['id'];
 111                 }
 112
 113                 if ($no_check || !self::check($url)) {
 114                         return null;
 115                 }
 116
 117                 return self::getID($url, true);
 118         }
 119
 120         /**
 121          * Retrieves all the servers which base domain are matching the provided domain pattern
 122          *
 123          * The pattern is a simple fnmatch() pattern with ? for single wildcard and * for multiple wildcard
 124          *
 125          * @param string $pattern
 126          * @return array
 127          * @throws Exception
 128          */
 129         public static function listByDomainPattern(string $pattern): array
 130         {
 131                 $likePattern = 'http://' . strtr($pattern, ['_' => '\_', '%' => '\%', '?' => '_', '*' => '%']);
 132
 133                 // The SUBSTRING_INDEX returns everything before the eventual third /, which effectively trims an
 134                 // eventual server path and keep only the server domain which we're matching against the pattern.
 135                 $sql = "SELECT `gserver`.*, COUNT(*) AS `contacts`
 136                         FROM `gserver`
 137                         LEFT JOIN `contact` ON `gserver`.`id` = `contact`.`gsid`
 138                         WHERE SUBSTRING_INDEX(`gserver`.`nurl`, '/', 3) LIKE ?
 139                         AND NOT `gserver`.`failed`
 140                         GROUP BY `gserver`.`id`";
 141
 142                 $stmt = DI::dba()->p($sql, $likePattern);
 143
 144                 return DI::dba()->toArray($stmt);
 145         }
 146
 147         /**
 148          * Checks if the given server is reachable
 149          *
 150          * @param string  $profile URL of the given profile
 151          * @param string  $server  URL of the given server (If empty, taken from profile)
 152          * @param string  $network Network value that is used, when detection failed
 153          * @param boolean $force   Force an update.
 154          *
 155          * @return boolean 'true' if server seems vital
 156          */
 157         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
 158         {
 159                 if ($server == '') {
 160                         $contact = Contact::getByURL($profile, null, ['baseurl']);
 161                         if (!empty($contact['baseurl'])) {
 162                                 $server = $contact['baseurl'];
 163                         }
 164                 }
 165
 166                 if ($server == '') {
 167                         return true;
 168                 }
 169
 170                 return self::check($server, $network, $force);
 171         }
 172
 173         public static function getNextUpdateDate(bool $success, string $created = '', string $last_contact = '')
 174         {
 175                 // On successful contact process check again next week
 176                 if ($success) {
 177                         return DateTimeFormat::utc('now +7 day');
 178                 }
 179
 180                 $now = strtotime(DateTimeFormat::utcNow());
 181
 182                 if ($created > $last_contact) {
 183                         $contact_time = strtotime($created);
 184                 } else {
 185                         $contact_time = strtotime($last_contact);
 186                 }
 187
 188                 // If the last contact was less than 6 hours before then try again in 6 hours
 189                 if (($now - $contact_time) < (60 * 60 * 6)) {
 190                         return DateTimeFormat::utc('now +6 hour');
 191                 }
 192
 193                 // If the last contact was less than 12 hours before then try again in 12 hours
 194                 if (($now - $contact_time) < (60 * 60 * 12)) {
 195                         return DateTimeFormat::utc('now +12 hour');
 196                 }
 197
 198                 // If the last contact was less than 24 hours before then try tomorrow again
 199                 if (($now - $contact_time) < (60 * 60 * 24)) {
 200                         return DateTimeFormat::utc('now +1 day');
 201                 }
 202
 203                 // If the last contact was less than a week before then try again in a week
 204                 if (($now - $contact_time) < (60 * 60 * 24 * 7)) {
 205                         return DateTimeFormat::utc('now +1 week');
 206                 }
 207
 208                 // If the last contact was less than two weeks before then try again in two week
 209                 if (($now - $contact_time) < (60 * 60 * 24 * 14)) {
 210                         return DateTimeFormat::utc('now +2 week');
 211                 }
 212
 213                 // If the last contact was less than a month before then try again in a month
 214                 if (($now - $contact_time) < (60 * 60 * 24 * 30)) {
 215                         return DateTimeFormat::utc('now +1 month');
 216                 }
 217
 218                 // The system hadn't been successul contacted for more than a month, so try again in three months
 219                 return DateTimeFormat::utc('now +3 month');
 220         }
 221
 222         /**
 223          * Checks the state of the given server.
 224          *
 225          * @param string  $server_url    URL of the given server
 226          * @param string  $network       Network value that is used, when detection failed
 227          * @param boolean $force         Force an update.
 228          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 229          *
 230          * @return boolean 'true' if server seems vital
 231          */
 232         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 233         {
 234                 $server_url = self::cleanURL($server_url);
 235                 if ($server_url == '') {
 236                         return false;
 237                 }
 238
 239                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 240                 if (DBA::isResult($gserver)) {
 241                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 242                                 $fields = ['created' => DateTimeFormat::utcNow()];
 243                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 244                                 DBA::update('gserver', $fields, $condition);
 245                         }
 246
 247                         if (!$force && (strtotime($gserver['next_contact']) > time())) {
 248                                 Logger::info('No update needed', ['server' => $server_url]);
 249                                 return (!$gserver['failed']);
 250                         }
 251                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force]);
 252                 } else {
 253                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 254                 }
 255
 256                 return self::detect($server_url, $network, $only_nodeinfo);
 257         }
 258
 259         /**
 260          * Set failed server status
 261          *
 262          * @param string $url
 263          */
 264         public static function setFailure(string $url)
 265         {
 266                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($url)]);
 267                 if (DBA::isResult($gserver)) {
 268                         $next_update = self::getNextUpdateDate(false, $gserver['created'], $gserver['last_contact']);
 269                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow(),
 270                         'next_contact' => $next_update, 'detection-method' => null],
 271                         ['nurl' => Strings::normaliseLink($url)]);
 272                         Logger::info('Set failed status for existing server', ['url' => $url]);
 273                         return;
 274                 }
 275                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 276                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 277                         'failed' => true, 'last_failure' => DateTimeFormat::utcNow()]);
 278                 Logger::info('Set failed status for new server', ['url' => $url]);
 279         }
 280
 281         /**
 282          * Remove unwanted content from the given URL
 283          *
 284          * @param string $url
 285          * @return string cleaned URL
 286          */
 287         public static function cleanURL(string $url)
 288         {
 289                 $url = trim($url, '/');
 290                 $url = str_replace('/index.php', '', $url);
 291
 292                 $urlparts = parse_url($url);
 293                 unset($urlparts['user']);
 294                 unset($urlparts['pass']);
 295                 unset($urlparts['query']);
 296                 unset($urlparts['fragment']);
 297                 return Network::unparseURL($urlparts);
 298         }
 299
 300         /**
 301          * Return the base URL
 302          *
 303          * @param string $url
 304          * @return string base URL
 305          */
 306         private static function getBaseURL(string $url)
 307         {
 308                 $urlparts = parse_url(self::cleanURL($url));
 309                 unset($urlparts['path']);
 310                 return Network::unparseURL($urlparts);
 311         }
 312
 313         /**
 314          * Detect server data (type, protocol, version number, ...)
 315          * The detected data is then updated or inserted in the gserver table.
 316          *
 317          * @param string  $url           URL of the given server
 318          * @param string  $network       Network value that is used, when detection failed
 319          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 320          *
 321          * @return boolean 'true' if server could be detected
 322          */
 323         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 324         {
 325                 Logger::info('Detect server type', ['server' => $url]);
 326                 $serverdata = ['detection-method' => self::DETECT_MANUAL];
 327
 328                 $original_url = $url;
 329
 330                 // Remove URL content that is not supposed to exist for a server url
 331                 $url = self::cleanURL($url);
 332
 333                 // Get base URL
 334                 $baseurl = self::getBaseURL($url);
 335
 336                 // If the URL missmatches, then we mark the old entry as failure
 337                 if ($url != $original_url) {
 338                         /// @todo What to do with "next_contact" here?
 339                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow()],
 340                                 ['nurl' => Strings::normaliseLink($original_url)]);
 341                 }
 342
 343                 // When a nodeinfo is present, we don't need to dig further
 344                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 345                 $curlResult = DI::httpClient()->get($url . '/.well-known/nodeinfo', [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 346                 if ($curlResult->isTimeout()) {
 347                         self::setFailure($url);
 348                         return false;
 349                 }
 350
 351                 // On a redirect follow the new host but mark the old one as failure
 352                 if ($curlResult->isSuccess() && !empty($curlResult->getRedirectUrl()) && (parse_url($url, PHP_URL_HOST) != parse_url($curlResult->getRedirectUrl(), PHP_URL_HOST))) {
 353                         $curlResult = DI::httpClient()->get($url, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 354                         if (!empty($curlResult->getRedirectUrl()) && parse_url($url, PHP_URL_HOST) != parse_url($curlResult->getRedirectUrl(), PHP_URL_HOST)) {
 355                                 Logger::info('Found redirect. Mark old entry as failure', ['old' => $url, 'new' => $curlResult->getRedirectUrl()]);
 356                                 self::setFailure($url);
 357                                 self::detect($curlResult->getRedirectUrl(), $network, $only_nodeinfo);
 358                                 return false;
 359                         }
 360                 }
 361
 362                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 363                 if ($only_nodeinfo && empty($nodeinfo)) {
 364                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 365                         self::setFailure($url);
 366                         return false;
 367                 }
 368
 369                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 370                 if (empty($nodeinfo)) {
 371                         $nodeinfo = self::fetchStatistics($url);
 372                 }
 373
 374                 // If that didn't work out well, we use some protocol specific endpoints
 375                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 376                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 377                         if (!empty($nodeinfo['detection-method'])) {
 378                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 379                         }
 380
 381                         // Fetch the landing page, possibly it reveals some data
 382                         if (empty($nodeinfo['network'])) {
 383                                 if ($baseurl == $url) {
 384                                         $basedata = $serverdata;
 385                                 } else {
 386                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 387                                 }
 388
 389                                 $curlResult = DI::httpClient()->get($baseurl, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 390                                 if ($curlResult->isSuccess()) {
 391                                         if (!empty($curlResult->getRedirectUrl()) && (parse_url($baseurl, PHP_URL_HOST) != parse_url($curlResult->getRedirectUrl(), PHP_URL_HOST))) {
 392                                                 Logger::info('Found redirect. Mark old entry as failure', ['old' => $url, 'new' => $curlResult->getRedirectUrl()]);
 393                                                 self::setFailure($url);
 394                                                 self::detect($curlResult->getRedirectUrl(), $network, $only_nodeinfo);
 395                                                 return false;
 396                                         }
 397
 398                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 399                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 400                                 }
 401
 402                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 403                                         self::setFailure($url);
 404                                         return false;
 405                                 }
 406
 407                                 if ($baseurl == $url) {
 408                                         $serverdata = $basedata;
 409                                 } else {
 410                                         // When the base path doesn't seem to contain a social network we try the complete path.
 411                                         // Most detectable system have to be installed in the root directory.
 412                                         // We checked the base to avoid false positives.
 413                                         $curlResult = DI::httpClient()->get($url, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 414                                         if ($curlResult->isSuccess()) {
 415                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 416                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 417
 418                                                 $comparebase = $basedata;
 419                                                 unset($comparebase['info']);
 420                                                 unset($comparebase['site_name']);
 421                                                 $compareurl = $urldata;
 422                                                 unset($compareurl['info']);
 423                                                 unset($compareurl['site_name']);
 424
 425                                                 // We assume that no one will install the identical system in the root and a subfolder
 426                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 427                                                         $serverdata = $urldata;
 428                                                 }
 429                                         }
 430                                 }
 431                         }
 432
 433                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 434                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 435                         }
 436
 437                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 438                         // With this check we don't have to waste time and ressources for dead systems.
 439                         // Also this hopefully prevents us from receiving abuse messages.
 440                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 441                                 self::setFailure($url);
 442                                 return false;
 443                         }
 444
 445                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 446                                 $serverdata = self::detectFriendica($url, $serverdata);
 447                         }
 448
 449                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 450                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 451                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 452                         }
 453
 454                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 455                         if (empty($serverdata['network'])) {
 456                                 $serverdata = self::detectHubzilla($url, $serverdata);
 457                         }
 458
 459                         if (empty($serverdata['network']) || in_array($serverdata['detection-method'], [self::DETECT_MANUAL, self::DETECT_BODY])) {
 460                                 $serverdata = self::detectPeertube($url, $serverdata);
 461                         }
 462
 463                         if (empty($serverdata['network'])) {
 464                                 $serverdata = self::detectNextcloud($url, $serverdata);
 465                         }
 466
 467                         if (empty($serverdata['network'])) {
 468                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 469                         }
 470
 471                         $serverdata = array_merge($nodeinfo, $serverdata);
 472                 } else {
 473                         $serverdata = $nodeinfo;
 474                 }
 475
 476                 // Detect the directory type
 477                 $serverdata['directory-type'] = self::DT_NONE;
 478                 $serverdata = self::checkPoCo($url, $serverdata);
 479                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 480
 481                 // We can't detect the network type. Possibly it is some system that we don't know yet
 482                 if (empty($serverdata['network'])) {
 483                         $serverdata['network'] = Protocol::PHANTOM;
 484                 }
 485
 486                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 487                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 488                         $serverdata['network'] = $network;
 489                 }
 490
 491                 $serverdata['url'] = $url;
 492                 $serverdata['nurl'] = Strings::normaliseLink($url);
 493
 494                 // We take the highest number that we do find
 495                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 496
 497                 // On an active server there has to be at least a single user
 498                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 499                         $registeredUsers = 1;
 500                 }
 501
 502                 if ($serverdata['network'] == Protocol::PHANTOM) {
 503                         $serverdata['registered-users'] = max($registeredUsers, 1);
 504                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 505                 }
 506
 507                 $serverdata['next_contact'] = self::getNextUpdateDate(true);
 508
 509                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 510                 $serverdata['failed'] = false;
 511
 512                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 513                 if (!DBA::isResult($gserver)) {
 514                         $serverdata['created'] = DateTimeFormat::utcNow();
 515                         $ret = DBA::insert('gserver', $serverdata);
 516                         $id = DBA::lastInsertId();
 517                 } else {
 518                         // Don't override the network with 'unknown' when there had been a valid entry before
 519                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 520                                 unset($serverdata['network']);
 521                         }
 522
 523                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 524                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 525                         if (DBA::isResult($gserver)) {
 526                                 $id = $gserver['id'];
 527                         }
 528                 }
 529
 530                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 531                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 532                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 533                         $max_users = max($apcontacts, $contacts, $registeredUsers, 1);
 534                         if ($max_users > $registeredUsers) {
 535                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 536                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 537                         }
 538                 }
 539
 540                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 541                         self::discoverRelay($url);
 542                 }
 543
 544                 return $ret;
 545         }
 546
 547         /**
 548          * Fetch relay data from a given server url
 549          *
 550          * @param string $server_url address of the server
 551          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 552          */
 553         private static function discoverRelay(string $server_url)
 554         {
 555                 Logger::info('Discover relay data', ['server' => $server_url]);
 556
 557                 $curlResult = DI::httpClient()->get($server_url . '/.well-known/x-social-relay');
 558                 if (!$curlResult->isSuccess()) {
 559                         return;
 560                 }
 561
 562                 $data = json_decode($curlResult->getBody(), true);
 563                 if (!is_array($data)) {
 564                         return;
 565                 }
 566
 567                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 568                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 569
 570                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 571                         $data['scope'] = '';
 572                         $data['subscribe'] = false;
 573                         $data['tags'] = [];
 574                 }
 575
 576                 $gserver = DBA::selectFirst('gserver', ['id', 'url', 'network', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 577                 if (!DBA::isResult($gserver)) {
 578                         return;
 579                 }
 580
 581                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 582                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 583                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 584                 }
 585
 586                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 587
 588                 if ($data['scope'] == 'tags') {
 589                         // Avoid duplicates
 590                         $tags = [];
 591                         foreach ($data['tags'] as $tag) {
 592                                 $tag = mb_strtolower($tag);
 593                                 if (strlen($tag) < 100) {
 594                                         $tags[$tag] = $tag;
 595                                 }
 596                         }
 597
 598                         foreach ($tags as $tag) {
 599                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], Database::INSERT_IGNORE);
 600                         }
 601                 }
 602
 603                 // Create or update the relay contact
 604                 $fields = [];
 605                 if (isset($data['protocols'])) {
 606                         if (isset($data['protocols']['diaspora'])) {
 607                                 $fields['network'] = Protocol::DIASPORA;
 608
 609                                 if (isset($data['protocols']['diaspora']['receive'])) {
 610                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 611                                 } elseif (is_string($data['protocols']['diaspora'])) {
 612                                         $fields['batch'] = $data['protocols']['diaspora'];
 613                                 }
 614                         }
 615
 616                         if (isset($data['protocols']['dfrn'])) {
 617                                 $fields['network'] = Protocol::DFRN;
 618
 619                                 if (isset($data['protocols']['dfrn']['receive'])) {
 620                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 621                                 } elseif (is_string($data['protocols']['dfrn'])) {
 622                                         $fields['batch'] = $data['protocols']['dfrn'];
 623                                 }
 624                         }
 625
 626                         if (isset($data['protocols']['activitypub'])) {
 627                                 $fields['network'] = Protocol::ACTIVITYPUB;
 628
 629                                 if (!empty($data['protocols']['activitypub']['actor'])) {
 630                                         $fields['url'] = $data['protocols']['activitypub']['actor'];
 631                                 }
 632                                 if (!empty($data['protocols']['activitypub']['receive'])) {
 633                                         $fields['batch'] = $data['protocols']['activitypub']['receive'];
 634                                 }
 635                         }
 636                 }
 637
 638                 Logger::info('Discovery ended', ['server' => $server_url, 'data' => $fields]);
 639
 640                 Relay::updateContact($gserver, $fields);
 641         }
 642
 643         /**
 644          * Fetch server data from '/statistics.json' on the given server
 645          *
 646          * @param string $url URL of the given server
 647          *
 648          * @return array server data
 649          */
 650         private static function fetchStatistics(string $url)
 651         {
 652                 $curlResult = DI::httpClient()->get($url . '/statistics.json');
 653                 if (!$curlResult->isSuccess()) {
 654                         return [];
 655                 }
 656
 657                 $data = json_decode($curlResult->getBody(), true);
 658                 if (empty($data)) {
 659                         return [];
 660                 }
 661
 662                 $serverdata = ['detection-method' => self::DETECT_STATISTICS_JSON];
 663
 664                 if (!empty($data['version'])) {
 665                         $serverdata['version'] = $data['version'];
 666                         // Version numbers on statistics.json are presented with additional info, e.g.:
 667                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 668                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 669                 }
 670
 671                 if (!empty($data['name'])) {
 672                         $serverdata['site_name'] = $data['name'];
 673                 }
 674
 675                 if (!empty($data['network'])) {
 676                         $serverdata['platform'] = strtolower($data['network']);
 677
 678                         if ($serverdata['platform'] == 'diaspora') {
 679                                 $serverdata['network'] = Protocol::DIASPORA;
 680                         } elseif ($serverdata['platform'] == 'friendica') {
 681                                 $serverdata['network'] = Protocol::DFRN;
 682                         } elseif ($serverdata['platform'] == 'hubzilla') {
 683                                 $serverdata['network'] = Protocol::ZOT;
 684                         } elseif ($serverdata['platform'] == 'redmatrix') {
 685                                 $serverdata['network'] = Protocol::ZOT;
 686                         }
 687                 }
 688
 689
 690                 if (!empty($data['registrations_open'])) {
 691                         $serverdata['register_policy'] = Register::OPEN;
 692                 } else {
 693                         $serverdata['register_policy'] = Register::CLOSED;
 694                 }
 695
 696                 return $serverdata;
 697         }
 698
 699         /**
 700          * Detect server type by using the nodeinfo data
 701          *
 702          * @param string                  $url        address of the server
 703          * @param ICanHandleHttpResponses $httpResult
 704          *
 705          * @return array Server data
 706          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 707          */
 708         private static function fetchNodeinfo(string $url, ICanHandleHttpResponses $httpResult)
 709         {
 710                 if (!$httpResult->isSuccess()) {
 711                         return [];
 712                 }
 713
 714                 $nodeinfo = json_decode($httpResult->getBody(), true);
 715
 716                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 717                         return [];
 718                 }
 719
 720                 $nodeinfo1_url = '';
 721                 $nodeinfo2_url = '';
 722
 723                 foreach ($nodeinfo['links'] as $link) {
 724                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 725                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 726                                 continue;
 727                         }
 728                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 729                                 $nodeinfo1_url = $link['href'];
 730                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 731                                 $nodeinfo2_url = $link['href'];
 732                         }
 733                 }
 734
 735                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 736                         return [];
 737                 }
 738
 739                 $server = [];
 740
 741                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 742                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 743                         $server = self::parseNodeinfo2($nodeinfo2_url);
 744                 }
 745
 746                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 747                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 748                         $server = self::parseNodeinfo1($nodeinfo1_url);
 749                 }
 750
 751                 return $server;
 752         }
 753
 754         /**
 755          * Parses Nodeinfo 1
 756          *
 757          * @param string $nodeinfo_url address of the nodeinfo path
 758          * @return array Server data
 759          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 760          */
 761         private static function parseNodeinfo1(string $nodeinfo_url)
 762         {
 763                 $curlResult = DI::httpClient()->get($nodeinfo_url);
 764
 765                 if (!$curlResult->isSuccess()) {
 766                         return [];
 767                 }
 768
 769                 $nodeinfo = json_decode($curlResult->getBody(), true);
 770
 771                 if (!is_array($nodeinfo)) {
 772                         return [];
 773                 }
 774
 775                 $server = ['detection-method' => self::DETECT_NODEINFO_1,
 776                         'register_policy' => Register::CLOSED];
 777
 778                 if (!empty($nodeinfo['openRegistrations'])) {
 779                         $server['register_policy'] = Register::OPEN;
 780                 }
 781
 782                 if (is_array($nodeinfo['software'])) {
 783                         if (!empty($nodeinfo['software']['name'])) {
 784                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 785                         }
 786
 787                         if (!empty($nodeinfo['software']['version'])) {
 788                                 $server['version'] = $nodeinfo['software']['version'];
 789                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 790                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 791                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 792                         }
 793                 }
 794
 795                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 796                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 797                 }
 798
 799                 if (!empty($nodeinfo['usage']['users']['total'])) {
 800                         $server['registered-users'] = max($nodeinfo['usage']['users']['total'], 1);
 801                 }
 802
 803                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 804                         $protocols = [];
 805                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 806                                 $protocols[$protocol] = true;
 807                         }
 808
 809                         if (!empty($protocols['friendica'])) {
 810                                 $server['network'] = Protocol::DFRN;
 811                         } elseif (!empty($protocols['activitypub'])) {
 812                                 $server['network'] = Protocol::ACTIVITYPUB;
 813                         } elseif (!empty($protocols['diaspora'])) {
 814                                 $server['network'] = Protocol::DIASPORA;
 815                         } elseif (!empty($protocols['ostatus'])) {
 816                                 $server['network'] = Protocol::OSTATUS;
 817                         } elseif (!empty($protocols['gnusocial'])) {
 818                                 $server['network'] = Protocol::OSTATUS;
 819                         } elseif (!empty($protocols['zot'])) {
 820                                 $server['network'] = Protocol::ZOT;
 821                         }
 822                 }
 823
 824                 if (empty($server)) {
 825                         return [];
 826                 }
 827
 828                 return $server;
 829         }
 830
 831         /**
 832          * Parses Nodeinfo 2
 833          *
 834          * @see https://git.feneas.org/jaywink/nodeinfo2
 835          * @param string $nodeinfo_url address of the nodeinfo path
 836          * @return array Server data
 837          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 838          */
 839         private static function parseNodeinfo2(string $nodeinfo_url)
 840         {
 841                 $curlResult = DI::httpClient()->get($nodeinfo_url);
 842                 if (!$curlResult->isSuccess()) {
 843                         return [];
 844                 }
 845
 846                 $nodeinfo = json_decode($curlResult->getBody(), true);
 847
 848                 if (!is_array($nodeinfo)) {
 849                         return [];
 850                 }
 851
 852                 $server = ['detection-method' => self::DETECT_NODEINFO_2,
 853                         'register_policy' => Register::CLOSED];
 854
 855                 if (!empty($nodeinfo['openRegistrations'])) {
 856                         $server['register_policy'] = Register::OPEN;
 857                 }
 858
 859                 if (is_array($nodeinfo['software'])) {
 860                         if (!empty($nodeinfo['software']['name'])) {
 861                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 862                         }
 863
 864                         if (!empty($nodeinfo['software']['version'])) {
 865                                 $server['version'] = $nodeinfo['software']['version'];
 866                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 867                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 868                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 869                         }
 870                 }
 871
 872                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 873                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 874                 }
 875
 876                 if (!empty($nodeinfo['usage']['users']['total'])) {
 877                         $server['registered-users'] = max($nodeinfo['usage']['users']['total'], 1);
 878                 }
 879
 880                 if (!empty($nodeinfo['protocols'])) {
 881                         $protocols = [];
 882                         foreach ($nodeinfo['protocols'] as $protocol) {
 883                                 if (is_string($protocol)) {
 884                                         $protocols[$protocol] = true;
 885                                 }
 886                         }
 887
 888                         if (!empty($protocols['dfrn'])) {
 889                                 $server['network'] = Protocol::DFRN;
 890                         } elseif (!empty($protocols['activitypub'])) {
 891                                 $server['network'] = Protocol::ACTIVITYPUB;
 892                         } elseif (!empty($protocols['diaspora'])) {
 893                                 $server['network'] = Protocol::DIASPORA;
 894                         } elseif (!empty($protocols['ostatus'])) {
 895                                 $server['network'] = Protocol::OSTATUS;
 896                         } elseif (!empty($protocols['gnusocial'])) {
 897                                 $server['network'] = Protocol::OSTATUS;
 898                         } elseif (!empty($protocols['zot'])) {
 899                                 $server['network'] = Protocol::ZOT;
 900                         }
 901                 }
 902
 903                 if (empty($server)) {
 904                         return [];
 905                 }
 906
 907                 return $server;
 908         }
 909
 910         /**
 911          * Fetch server information from a 'siteinfo.json' file on the given server
 912          *
 913          * @param string $url        URL of the given server
 914          * @param array  $serverdata array with server data
 915          *
 916          * @return array server data
 917          */
 918         private static function fetchSiteinfo(string $url, array $serverdata)
 919         {
 920                 $curlResult = DI::httpClient()->get($url . '/siteinfo.json');
 921                 if (!$curlResult->isSuccess()) {
 922                         return $serverdata;
 923                 }
 924
 925                 $data = json_decode($curlResult->getBody(), true);
 926                 if (empty($data)) {
 927                         return $serverdata;
 928                 }
 929
 930                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
 931                         $serverdata['detection-method'] = self::DETECT_SITEINFO_JSON;
 932                 }
 933
 934                 if (!empty($data['url'])) {
 935                         $serverdata['platform'] = strtolower($data['platform']);
 936                         $serverdata['version'] = $data['version'];
 937                 }
 938
 939                 if (!empty($data['plugins'])) {
 940                         if (in_array('pubcrawl', $data['plugins'])) {
 941                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 942                         } elseif (in_array('diaspora', $data['plugins'])) {
 943                                 $serverdata['network'] = Protocol::DIASPORA;
 944                         } elseif (in_array('gnusoc', $data['plugins'])) {
 945                                 $serverdata['network'] = Protocol::OSTATUS;
 946                         } else {
 947                                 $serverdata['network'] = Protocol::ZOT;
 948                         }
 949                 }
 950
 951                 if (!empty($data['site_name'])) {
 952                         $serverdata['site_name'] = $data['site_name'];
 953                 }
 954
 955                 if (!empty($data['channels_total'])) {
 956                         $serverdata['registered-users'] = max($data['channels_total'], 1);
 957                 }
 958
 959                 if (!empty($data['register_policy'])) {
 960                         switch ($data['register_policy']) {
 961                                 case 'REGISTER_OPEN':
 962                                         $serverdata['register_policy'] = Register::OPEN;
 963                                         break;
 964
 965                                 case 'REGISTER_APPROVE':
 966                                         $serverdata['register_policy'] = Register::APPROVE;
 967                                         break;
 968
 969                                 case 'REGISTER_CLOSED':
 970                                 default:
 971                                         $serverdata['register_policy'] = Register::CLOSED;
 972                                         break;
 973                         }
 974                 }
 975
 976                 return $serverdata;
 977         }
 978
 979         /**
 980          * Checks if the server contains a valid host meta file
 981          *
 982          * @param string $url URL of the given server
 983          *
 984          * @return boolean 'true' if the server seems to be vital
 985          */
 986         private static function validHostMeta(string $url)
 987         {
 988                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 989                 $curlResult = DI::httpClient()->get($url . '/.well-known/host-meta', [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 990                 if (!$curlResult->isSuccess()) {
 991                         return false;
 992                 }
 993
 994                 $xrd = XML::parseString($curlResult->getBody());
 995                 if (!is_object($xrd)) {
 996                         return false;
 997                 }
 998
 999                 $elements = XML::elementToArray($xrd);
1000                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
1001                         return false;
1002                 }
1003
1004                 $valid = false;
1005                 foreach ($elements['xrd']['link'] as $link) {
1006                         // When there is more than a single "link" element, the array looks slightly different
1007                         if (!empty($link['@attributes'])) {
1008                                 $link = $link['@attributes'];
1009                         }
1010
1011                         if (empty($link['rel']) || empty($link['template'])) {
1012                                 continue;
1013                         }
1014
1015                         if ($link['rel'] == 'lrdd') {
1016                                 // When the webfinger host is the same like the system host, it should be ok.
1017                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
1018                         }
1019                 }
1020
1021                 return $valid;
1022         }
1023
1024         /**
1025          * Detect the network of the given server via their known contacts
1026          *
1027          * @param string $url        URL of the given server
1028          * @param array  $serverdata array with server data
1029          *
1030          * @return array server data
1031          */
1032         private static function detectNetworkViaContacts(string $url, array $serverdata)
1033         {
1034                 $contacts = [];
1035
1036                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
1037                 while ($apcontact = DBA::fetch($apcontacts)) {
1038                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
1039                 }
1040                 DBA::close($apcontacts);
1041
1042                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
1043                 while ($pcontact = DBA::fetch($pcontacts)) {
1044                         $contacts[$pcontact['nurl']] = $pcontact['url'];
1045                 }
1046                 DBA::close($pcontacts);
1047
1048                 if (empty($contacts)) {
1049                         return $serverdata;
1050                 }
1051
1052                 foreach ($contacts as $contact) {
1053                         $probed = Contact::getByURL($contact);
1054                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
1055                                 $serverdata['network'] = $probed['network'];
1056                                 break;
1057                         }
1058                 }
1059
1060                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts), 1);
1061
1062                 return $serverdata;
1063         }
1064
1065         /**
1066          * Checks if the given server does have a '/poco' endpoint.
1067          * This is used for the 'PortableContact' functionality,
1068          * which is used by both Friendica and Hubzilla.
1069          *
1070          * @param string $url        URL of the given server
1071          * @param array  $serverdata array with server data
1072          *
1073          * @return array server data
1074          */
1075         private static function checkPoCo(string $url, array $serverdata)
1076         {
1077                 $serverdata['poco'] = '';
1078
1079                 $curlResult = DI::httpClient()->get($url . '/poco');
1080                 if (!$curlResult->isSuccess()) {
1081                         return $serverdata;
1082                 }
1083
1084                 $data = json_decode($curlResult->getBody(), true);
1085                 if (empty($data)) {
1086                         return $serverdata;
1087                 }
1088
1089                 if (!empty($data['totalResults'])) {
1090                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1091                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers, 1);
1092                         $serverdata['directory-type'] = self::DT_POCO;
1093                         $serverdata['poco'] = $url . '/poco';
1094                 }
1095
1096                 return $serverdata;
1097         }
1098
1099         /**
1100          * Checks if the given server does have a Mastodon style directory endpoint.
1101          *
1102          * @param string $url        URL of the given server
1103          * @param array  $serverdata array with server data
1104          *
1105          * @return array server data
1106          */
1107         public static function checkMastodonDirectory(string $url, array $serverdata)
1108         {
1109                 $curlResult = DI::httpClient()->get($url . '/api/v1/directory?limit=1');
1110                 if (!$curlResult->isSuccess()) {
1111                         return $serverdata;
1112                 }
1113
1114                 $data = json_decode($curlResult->getBody(), true);
1115                 if (empty($data)) {
1116                         return $serverdata;
1117                 }
1118
1119                 if (count($data) == 1) {
1120                         $serverdata['directory-type'] = self::DT_MASTODON;
1121                 }
1122
1123                 return $serverdata;
1124         }
1125
1126         /**
1127          * Detects Peertube via their known endpoint
1128          *
1129          * @param string $url        URL of the given server
1130          * @param array  $serverdata array with server data
1131          *
1132          * @return array server data
1133          */
1134         private static function detectPeertube(string $url, array $serverdata)
1135         {
1136                 $curlResult = DI::httpClient()->get($url . '/api/v1/config');
1137
1138                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1139                         return $serverdata;
1140                 }
1141
1142                 $data = json_decode($curlResult->getBody(), true);
1143                 if (empty($data)) {
1144                         return $serverdata;
1145                 }
1146
1147                 if (!empty($data['instance']) && !empty($data['serverVersion'])) {
1148                         $serverdata['platform'] = 'peertube';
1149                         $serverdata['version'] = $data['serverVersion'];
1150                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1151
1152                         if (!empty($data['instance']['name'])) {
1153                                 $serverdata['site_name'] = $data['instance']['name'];
1154                         }
1155
1156                         if (!empty($data['instance']['shortDescription'])) {
1157                                 $serverdata['info'] = $data['instance']['shortDescription'];
1158                         }
1159
1160                         if (!empty($data['signup'])) {
1161                                 if (!empty($data['signup']['allowed'])) {
1162                                         $serverdata['register_policy'] = Register::OPEN;
1163                                 }
1164                         }
1165
1166                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1167                                 $serverdata['detection-method'] = self::DETECT_V1_CONFIG;
1168                         }
1169                 }
1170
1171                 return $serverdata;
1172         }
1173
1174         /**
1175          * Detects the version number of a given server when it was a NextCloud installation
1176          *
1177          * @param string $url        URL of the given server
1178          * @param array  $serverdata array with server data
1179          *
1180          * @return array server data
1181          */
1182         private static function detectNextcloud(string $url, array $serverdata)
1183         {
1184                 $curlResult = DI::httpClient()->get($url . '/status.php');
1185
1186                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1187                         return $serverdata;
1188                 }
1189
1190                 $data = json_decode($curlResult->getBody(), true);
1191                 if (empty($data)) {
1192                         return $serverdata;
1193                 }
1194
1195                 if (!empty($data['version'])) {
1196                         $serverdata['platform'] = 'nextcloud';
1197                         $serverdata['version'] = $data['version'];
1198                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1199
1200                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1201                                 $serverdata['detection-method'] = self::DETECT_STATUS_PHP;
1202                         }
1203                 }
1204
1205                 return $serverdata;
1206         }
1207
1208         /**
1209          * Detects data from a given server url if it was a mastodon alike system
1210          *
1211          * @param string $url        URL of the given server
1212          * @param array  $serverdata array with server data
1213          *
1214          * @return array server data
1215          */
1216         private static function detectMastodonAlikes(string $url, array $serverdata)
1217         {
1218                 $curlResult = DI::httpClient()->get($url . '/api/v1/instance');
1219
1220                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1221                         return $serverdata;
1222                 }
1223
1224                 $data = json_decode($curlResult->getBody(), true);
1225                 if (empty($data)) {
1226                         return $serverdata;
1227                 }
1228
1229                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1230                         $serverdata['detection-method'] = self::DETECT_MASTODON_API;
1231                 }
1232
1233                 if (!empty($data['version'])) {
1234                         $serverdata['platform'] = 'mastodon';
1235                         $serverdata['version'] = $data['version'] ?? '';
1236                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1237                 }
1238
1239                 if (!empty($data['title'])) {
1240                         $serverdata['site_name'] = $data['title'];
1241                 }
1242
1243                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
1244                         $serverdata['platform'] = 'mastodon';
1245                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1246                 }
1247
1248                 if (!empty($data['description'])) {
1249                         $serverdata['info'] = trim($data['description']);
1250                 }
1251
1252                 if (!empty($data['stats']['user_count'])) {
1253                         $serverdata['registered-users'] = max($data['stats']['user_count'], 1);
1254                 }
1255
1256                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1257                         $serverdata['platform'] = strtolower($matches[1]);
1258                         $serverdata['version'] = $matches[2];
1259                 }
1260
1261                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1262                         $serverdata['platform'] = 'pleroma';
1263                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1264                 }
1265
1266                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1267                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1268                         $serverdata['platform'] = 'pleroma';
1269                 }
1270
1271                 return $serverdata;
1272         }
1273
1274         /**
1275          * Detects data from typical Hubzilla endpoints
1276          *
1277          * @param string $url        URL of the given server
1278          * @param array  $serverdata array with server data
1279          *
1280          * @return array server data
1281          */
1282         private static function detectHubzilla(string $url, array $serverdata)
1283         {
1284                 $curlResult = DI::httpClient()->get($url . '/api/statusnet/config.json');
1285                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1286                         return $serverdata;
1287                 }
1288
1289                 $data = json_decode($curlResult->getBody(), true);
1290                 if (empty($data) || empty($data['site'])) {
1291                         return $serverdata;
1292                 }
1293
1294                 if (!empty($data['site']['name'])) {
1295                         $serverdata['site_name'] = $data['site']['name'];
1296                 }
1297
1298                 if (!empty($data['site']['platform'])) {
1299                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1300                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1301                         $serverdata['network'] = Protocol::ZOT;
1302                 }
1303
1304                 if (!empty($data['site']['hubzilla'])) {
1305                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1306                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1307                         $serverdata['network'] = Protocol::ZOT;
1308                 }
1309
1310                 if (!empty($data['site']['redmatrix'])) {
1311                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1312                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1313                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1314                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1315                         }
1316
1317                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1318                         $serverdata['network'] = Protocol::ZOT;
1319                 }
1320
1321                 $private = false;
1322                 $inviteonly = false;
1323                 $closed = false;
1324
1325                 if (!empty($data['site']['closed'])) {
1326                         $closed = self::toBoolean($data['site']['closed']);
1327                 }
1328
1329                 if (!empty($data['site']['private'])) {
1330                         $private = self::toBoolean($data['site']['private']);
1331                 }
1332
1333                 if (!empty($data['site']['inviteonly'])) {
1334                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1335                 }
1336
1337                 if (!$closed && !$private and $inviteonly) {
1338                         $serverdata['register_policy'] = Register::APPROVE;
1339                 } elseif (!$closed && !$private) {
1340                         $serverdata['register_policy'] = Register::OPEN;
1341                 } else {
1342                         $serverdata['register_policy'] = Register::CLOSED;
1343                 }
1344
1345                 if (!empty($serverdata['network']) && in_array($serverdata['detection-method'],
1346                         [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1347                         $serverdata['detection-method'] = self::DETECT_CONFIG_JSON;
1348                 }
1349
1350                 return $serverdata;
1351         }
1352
1353         /**
1354          * Converts input value to a boolean value
1355          *
1356          * @param string|integer $val
1357          *
1358          * @return boolean
1359          */
1360         private static function toBoolean($val)
1361         {
1362                 if (($val == 'true') || ($val == 1)) {
1363                         return true;
1364                 } elseif (($val == 'false') || ($val == 0)) {
1365                         return false;
1366                 }
1367
1368                 return $val;
1369         }
1370
1371         /**
1372          * Detect if the URL belongs to a GNU Social server
1373          *
1374          * @param string $url        URL of the given server
1375          * @param array  $serverdata array with server data
1376          *
1377          * @return array server data
1378          */
1379         private static function detectGNUSocial(string $url, array $serverdata)
1380         {
1381                 // Test for GNU Social
1382                 $curlResult = DI::httpClient()->get($url . '/api/gnusocial/version.json');
1383                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1384                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1385                         $serverdata['platform'] = 'gnusocial';
1386                         // Remove junk that some GNU Social servers return
1387                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1388                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1389                         $serverdata['version'] = trim($serverdata['version'], '"');
1390                         $serverdata['network'] = Protocol::OSTATUS;
1391
1392                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1393                                 $serverdata['detection-method'] = self::DETECT_GNUSOCIAL;
1394                         }
1395
1396                         return $serverdata;
1397                 }
1398
1399                 // Test for Statusnet
1400                 $curlResult = DI::httpClient()->get($url . '/api/statusnet/version.json');
1401                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1402                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1403
1404                         // Remove junk that some GNU Social servers return
1405                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1406                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1407                         $serverdata['version'] = trim($serverdata['version'], '"');
1408
1409                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1410                                 $serverdata['platform'] = 'pleroma';
1411                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1412                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1413                         } else {
1414                                 $serverdata['platform'] = 'statusnet';
1415                                 $serverdata['network'] = Protocol::OSTATUS;
1416                         }
1417
1418                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1419                                 $serverdata['detection-method'] = self::DETECT_STATUSNET;
1420                         }
1421                 }
1422
1423                 return $serverdata;
1424         }
1425
1426         /**
1427          * Detect if the URL belongs to a Friendica server
1428          *
1429          * @param string $url        URL of the given server
1430          * @param array  $serverdata array with server data
1431          *
1432          * @return array server data
1433          */
1434         private static function detectFriendica(string $url, array $serverdata)
1435         {
1436                 $curlResult = DI::httpClient()->get($url . '/friendica/json');
1437                 if (!$curlResult->isSuccess()) {
1438                         $curlResult = DI::httpClient()->get($url . '/friendika/json');
1439                         $friendika = true;
1440                         $platform = 'Friendika';
1441                 } else {
1442                         $friendika = false;
1443                         $platform = 'Friendica';
1444                 }
1445
1446                 if (!$curlResult->isSuccess()) {
1447                         return $serverdata;
1448                 }
1449
1450                 $data = json_decode($curlResult->getBody(), true);
1451                 if (empty($data) || empty($data['version'])) {
1452                         return $serverdata;
1453                 }
1454
1455                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1456                         $serverdata['detection-method'] = $friendika ? self::DETECT_FRIENDIKA : self::DETECT_FRIENDICA;
1457                 }
1458
1459                 $serverdata['network'] = Protocol::DFRN;
1460                 $serverdata['version'] = $data['version'];
1461
1462                 if (!empty($data['no_scrape_url'])) {
1463                         $serverdata['noscrape'] = $data['no_scrape_url'];
1464                 }
1465
1466                 if (!empty($data['site_name'])) {
1467                         $serverdata['site_name'] = $data['site_name'];
1468                 }
1469
1470                 if (!empty($data['info'])) {
1471                         $serverdata['info'] = trim($data['info']);
1472                 }
1473
1474                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1475                 switch ($register_policy) {
1476                         case 'REGISTER_OPEN':
1477                                 $serverdata['register_policy'] = Register::OPEN;
1478                                 break;
1479
1480                         case 'REGISTER_APPROVE':
1481                                 $serverdata['register_policy'] = Register::APPROVE;
1482                                 break;
1483
1484                         case 'REGISTER_CLOSED':
1485                         case 'REGISTER_INVITATION':
1486                                 $serverdata['register_policy'] = Register::CLOSED;
1487                                 break;
1488                         default:
1489                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1490                                 $serverdata['register_policy'] = Register::CLOSED;
1491                                 break;
1492                 }
1493
1494                 $serverdata['platform'] = strtolower($data['platform'] ?? $platform);
1495
1496                 return $serverdata;
1497         }
1498
1499         /**
1500          * Analyses the landing page of a given server for hints about type and system of that server
1501          *
1502          * @param object $curlResult result of curl execution
1503          * @param array  $serverdata array with server data
1504          * @param string $url        Server URL
1505          *
1506          * @return array server data
1507          */
1508         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1509         {
1510                 if (empty($curlResult->getBody())) {
1511                         return $serverdata;
1512                 }
1513
1514                 $doc = new DOMDocument();
1515                 @$doc->loadHTML($curlResult->getBody());
1516                 $xpath = new DOMXPath($doc);
1517
1518                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1519                 if (!empty($title)) {
1520                         $serverdata['site_name'] = $title;
1521                 }
1522
1523                 $list = $xpath->query('//meta[@name]');
1524
1525                 foreach ($list as $node) {
1526                         $attr = [];
1527                         if ($node->attributes->length) {
1528                                 foreach ($node->attributes as $attribute) {
1529                                         $value = trim($attribute->value);
1530                                         if (empty($value)) {
1531                                                 continue;
1532                                         }
1533
1534                                         $attr[$attribute->name] = $value;
1535                                 }
1536
1537                                 if (empty($attr['name']) || empty($attr['content'])) {
1538                                         continue;
1539                                 }
1540                         }
1541
1542                         if ($attr['name'] == 'description') {
1543                                 $serverdata['info'] = $attr['content'];
1544                         }
1545
1546                         if (in_array($attr['name'], ['application-name', 'al:android:app_name', 'al:ios:app_name',
1547                                 'twitter:app:name:googleplay', 'twitter:app:name:iphone', 'twitter:app:name:ipad'])) {
1548                                 $serverdata['platform'] = strtolower($attr['content']);
1549                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1550                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1551                                 }
1552                         }
1553                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1554                                 $serverdata['platform'] = strtolower($attr['content']);
1555                                 $version_part = explode(' ', $attr['content']);
1556
1557                                 if (count($version_part) == 2) {
1558                                         if (in_array($version_part[0], ['WordPress'])) {
1559                                                 $serverdata['platform'] = 'wordpress';
1560                                                 $serverdata['version'] = $version_part[1];
1561
1562                                                 // We still do need a reliable test if some AP plugin is activated
1563                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1564                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1565                                                 } else {
1566                                                         $serverdata['network'] = Protocol::FEED;
1567                                                 }
1568
1569                                                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1570                                                         $serverdata['detection-method'] = self::DETECT_BODY;
1571                                                 }
1572                                         }
1573                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1574                                                 $serverdata['platform'] = strtolower($version_part[0]);
1575                                                 $serverdata['version'] = $version_part[1];
1576                                                 $serverdata['network'] = Protocol::DFRN;
1577                                         }
1578                                 }
1579                         }
1580                 }
1581
1582                 $list = $xpath->query('//meta[@property]');
1583
1584                 foreach ($list as $node) {
1585                         $attr = [];
1586                         if ($node->attributes->length) {
1587                                 foreach ($node->attributes as $attribute) {
1588                                         $value = trim($attribute->value);
1589                                         if (empty($value)) {
1590                                                 continue;
1591                                         }
1592
1593                                         $attr[$attribute->name] = $value;
1594                                 }
1595
1596                                 if (empty($attr['property']) || empty($attr['content'])) {
1597                                         continue;
1598                                 }
1599                         }
1600
1601                         if ($attr['property'] == 'og:site_name') {
1602                                 $serverdata['site_name'] = $attr['content'];
1603                         }
1604
1605                         if ($attr['property'] == 'og:description') {
1606                                 $serverdata['info'] = $attr['content'];
1607                         }
1608
1609                         if ($attr['property'] == 'og:platform') {
1610                                 $serverdata['platform'] = strtolower($attr['content']);
1611
1612                                 if (in_array($attr['content'], ['PeerTube'])) {
1613                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1614                                 }
1615                         }
1616
1617                         if ($attr['property'] == 'generator') {
1618                                 $serverdata['platform'] = strtolower($attr['content']);
1619
1620                                 if (in_array($attr['content'], ['hubzilla'])) {
1621                                         // We later check which compatible protocol modules are loaded.
1622                                         $serverdata['network'] = Protocol::ZOT;
1623                                 }
1624                         }
1625                 }
1626
1627                 if (!empty($serverdata['network']) && ($serverdata['detection-method'] == self::DETECT_MANUAL)) {
1628                         $serverdata['detection-method'] = self::DETECT_BODY;
1629                 }
1630
1631                 return $serverdata;
1632         }
1633
1634         /**
1635          * Analyses the header data of a given server for hints about type and system of that server
1636          *
1637          * @param object $curlResult result of curl execution
1638          * @param array  $serverdata array with server data
1639          *
1640          * @return array server data
1641          */
1642         private static function analyseRootHeader($curlResult, array $serverdata)
1643         {
1644                 if ($curlResult->getHeader('server') == 'Mastodon') {
1645                         $serverdata['platform'] = 'mastodon';
1646                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1647                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1648                         $serverdata['platform'] = 'diaspora';
1649                         $serverdata['network'] = Protocol::DIASPORA;
1650                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version')[0] ?? '';
1651                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1652                         $serverdata['platform'] = 'friendica';
1653                         $serverdata['network'] = Protocol::DFRN;
1654                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version')[0] ?? '';
1655                 } else {
1656                         return $serverdata;
1657                 }
1658
1659                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1660                         $serverdata['detection-method'] = self::DETECT_HEADER;
1661                 }
1662
1663                 return $serverdata;
1664         }
1665
1666         /**
1667          * Test if the body contains valid content
1668          *
1669          * @param string $body
1670          * @return boolean
1671          */
1672         private static function invalidBody(string $body)
1673         {
1674                 // Currently we only test for a HTML element.
1675                 // Possibly we enhance this in the future.
1676                 return !strpos($body, '>');
1677         }
1678
1679         /**
1680          * Update GServer entries
1681          */
1682         public static function discover()
1683         {
1684                 // Update the server list
1685                 self::discoverFederation();
1686
1687                 $no_of_queries = 5;
1688
1689                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1690
1691                 if ($requery_days == 0) {
1692                         $requery_days = 7;
1693                 }
1694
1695                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1696
1697                 $gservers = DBA::select('gserver', ['id', 'url', 'nurl', 'network', 'poco', 'directory-type'],
1698                         ["NOT `failed` AND `directory-type` != ? AND `last_poco_query` < ?", GServer::DT_NONE, $last_update],
1699                         ['order' => ['RAND()']]);
1700
1701                 while ($gserver = DBA::fetch($gservers)) {
1702                         Logger::info('Update peer list', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1703                         Worker::add(PRIORITY_LOW, 'UpdateServerPeers', $gserver['url']);
1704
1705                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1706                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1707
1708                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1709                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1710
1711                         if (--$no_of_queries == 0) {
1712                                 break;
1713                         }
1714                 }
1715
1716                 DBA::close($gservers);
1717         }
1718
1719         /**
1720          * Discover federated servers
1721          */
1722         private static function discoverFederation()
1723         {
1724                 $last = DI::config()->get('poco', 'last_federation_discovery');
1725
1726                 if ($last) {
1727                         $next = $last + (24 * 60 * 60);
1728
1729                         if ($next > time()) {
1730                                 return;
1731                         }
1732                 }
1733
1734                 // Discover federated servers
1735                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1736                 foreach ($protocols as $protocol) {
1737                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1738                         $curlResult = DI::httpClient()->fetch('https://the-federation.info/graphql?query=' . urlencode($query));
1739                         if (!empty($curlResult)) {
1740                                 $data = json_decode($curlResult, true);
1741                                 if (!empty($data['data']['nodes'])) {
1742                                         foreach ($data['data']['nodes'] as $server) {
1743                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1744                                                 self::add('https://' . $server['host'], true);
1745                                         }
1746                                 }
1747                         }
1748                 }
1749
1750                 // Disvover Mastodon servers
1751                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1752
1753                 if (!empty($accesstoken)) {
1754                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1755                         $curlResult = DI::httpClient()->get($api, [HttpClientOptions::HEADERS => ['Authorization' => ['Bearer ' . $accesstoken]]]);
1756
1757                         if ($curlResult->isSuccess()) {
1758                                 $servers = json_decode($curlResult->getBody(), true);
1759
1760                                 foreach ($servers['instances'] as $server) {
1761                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1762                                         self::add($url);
1763                                 }
1764                         }
1765                 }
1766
1767                 DI::config()->set('poco', 'last_federation_discovery', time());
1768         }
1769
1770         /**
1771          * Set the protocol for the given server
1772          *
1773          * @param int $gsid     Server id
1774          * @param int $protocol Protocol id
1775          * @return void
1776          * @throws Exception
1777          */
1778         public static function setProtocol(int $gsid, int $protocol)
1779         {
1780                 if (empty($gsid)) {
1781                         return;
1782                 }
1783
1784                 $gserver = DBA::selectFirst('gserver', ['protocol', 'url'], ['id' => $gsid]);
1785                 if (!DBA::isResult($gserver)) {
1786                         return;
1787                 }
1788
1789                 $old = $gserver['protocol'];
1790
1791                 if (!is_null($old)) {
1792                         /*
1793                         The priority for the protocols is:
1794                                 1. ActivityPub
1795                                 2. DFRN via Diaspora
1796                                 3. Legacy DFRN
1797                                 4. Diaspora
1798                                 5. OStatus
1799                         */
1800
1801                         // We don't need to change it when nothing is to be changed
1802                         if ($old == $protocol) {
1803                                 return;
1804                         }
1805
1806                         // We don't want to mark a server as OStatus when it had been marked with any other protocol before
1807                         if ($protocol == Post\DeliveryData::OSTATUS) {
1808                                 return;
1809                         }
1810
1811                         // If the server is marked as ActivityPub then we won't change it to anything different
1812                         if ($old == Post\DeliveryData::ACTIVITYPUB) {
1813                                 return;
1814                         }
1815
1816                         // Don't change it to anything lower than DFRN if the new one wasn't ActivityPub
1817                         if (($old == Post\DeliveryData::DFRN) && ($protocol != Post\DeliveryData::ACTIVITYPUB)) {
1818                                 return;
1819                         }
1820
1821                         // Don't change it to Diaspora when it is a legacy DFRN server
1822                         if (($old == Post\DeliveryData::LEGACY_DFRN) && ($protocol == Post\DeliveryData::DIASPORA)) {
1823                                 return;
1824                         }
1825                 }
1826
1827                 Logger::info('Protocol for server', ['protocol' => $protocol, 'old' => $old, 'id' => $gsid, 'url' => $gserver['url'], 'callstack' => System::callstack(20)]);
1828                 DBA::update('gserver', ['protocol' => $protocol], ['id' => $gsid]);
1829         }
1830
1831         /**
1832          * Fetch the protocol of the given server
1833          *
1834          * @param int $gsid Server id
1835          * @return int
1836          * @throws Exception
1837          */
1838         public static function getProtocol(int $gsid)
1839         {
1840                 if (empty($gsid)) {
1841                         return null;
1842                 }
1843
1844                 $gserver = DBA::selectFirst('gserver', ['protocol'], ['id' => $gsid]);
1845                 if (DBA::isResult($gserver)) {
1846                         return $gserver['protocol'];
1847                 }
1848
1849                 return null;
1850         }
1851 }