src/Model/GServer.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   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 Friendica\Core\Logger;
  27 use Friendica\Core\Protocol;
  28 use Friendica\Core\System;
  29 use Friendica\Core\Worker;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Module\Register;
  33 use Friendica\Network\CurlResult;
  34 use Friendica\Protocol\Relay;
  35 use Friendica\Util\DateTimeFormat;
  36 use Friendica\Util\Network;
  37 use Friendica\Util\Strings;
  38 use Friendica\Util\XML;
  39
  40 /**
  41  * This class handles GServer related functions
  42  */
  43 class GServer
  44 {
  45         // Directory types
  46         const DT_NONE = 0;
  47         const DT_POCO = 1;
  48         const DT_MASTODON = 2;
  49
  50         // Methods to detect server types
  51
  52         // Non endpoint specific methods
  53         const DETECT_MANUAL = 0;
  54         const DETECT_HEADER = 1;
  55         const DETECT_BODY = 2;
  56
  57         // Implementation specific endpoints
  58         const DETECT_FRIENDIKA = 10;
  59         const DETECT_FRIENDICA = 11;
  60         const DETECT_STATUSNET = 12;
  61         const DETECT_GNUSOCIAL = 13;
  62         const DETECT_CONFIG_JSON = 14; // Statusnet, GNU Social, Older Hubzilla/Redmatrix
  63         const DETECT_SITEINFO_JSON = 15; // Newer Hubzilla
  64         const DETECT_MASTODON_API = 16;
  65         const DETECT_STATUS_PHP = 17; // Nextcloud
  66
  67         // Standardized endpoints
  68         const DETECT_STATISTICS_JSON = 100;
  69         const DETECT_NODEINFO_1 = 101;
  70         const DETECT_NODEINFO_2 = 102;
  71
  72         /**
  73          * Get the ID for the given server URL
  74          *
  75          * @param string $url
  76          * @param boolean $no_check Don't check if the server hadn't been found
  77          * @return int gserver id
  78          */
  79         public static function getID(string $url, bool $no_check = false)
  80         {
  81                 if (empty($url)) {
  82                         return null;
  83                 }
  84
  85                 $url = self::cleanURL($url);
  86
  87                 $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => Strings::normaliseLink($url)]);
  88                 if (DBA::isResult($gserver)) {
  89                         Logger::info('Got ID for URL', ['id' => $gserver['id'], 'url' => $url, 'callstack' => System::callstack(20)]);
  90                         return $gserver['id'];
  91                 }
  92
  93                 if ($no_check || !self::check($url)) {
  94                         return null;
  95                 }
  96
  97                 return self::getID($url, true);
  98         }
  99
 100         /**
 101          * Checks if the given server is reachable
 102          *
 103          * @param string  $profile URL of the given profile
 104          * @param string  $server  URL of the given server (If empty, taken from profile)
 105          * @param string  $network Network value that is used, when detection failed
 106          * @param boolean $force   Force an update.
 107          *
 108          * @return boolean 'true' if server seems vital
 109          */
 110         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
 111         {
 112                 if ($server == '') {
 113                         $contact = Contact::getByURL($profile, null, ['baseurl']);
 114                         if (!empty($contact['baseurl'])) {
 115                                 $server = $contact['baseurl'];
 116                         }
 117                 }
 118
 119                 if ($server == '') {
 120                         return true;
 121                 }
 122
 123                 return self::check($server, $network, $force);
 124         }
 125
 126         /**
 127          * Decides if a server needs to be updated, based upon several date fields
 128          *
 129          * @param date $created      Creation date of that server entry
 130          * @param date $updated      When had the server entry be updated
 131          * @param date $last_failure Last failure when contacting that server
 132          * @param date $last_contact Last time the server had been contacted
 133          *
 134          * @return boolean Does the server record needs an update?
 135          */
 136         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 137         {
 138                 $now = strtotime(DateTimeFormat::utcNow());
 139
 140                 if ($updated > $last_contact) {
 141                         $contact_time = strtotime($updated);
 142                 } else {
 143                         $contact_time = strtotime($last_contact);
 144                 }
 145
 146                 $failure_time = strtotime($last_failure);
 147                 $created_time = strtotime($created);
 148
 149                 // If there is no "created" time then use the current time
 150                 if ($created_time <= 0) {
 151                         $created_time = $now;
 152                 }
 153
 154                 // If the last contact was less than 24 hours then don't update
 155                 if (($now - $contact_time) < (60 * 60 * 24)) {
 156                         return false;
 157                 }
 158
 159                 // If the last failure was less than 24 hours then don't update
 160                 if (($now - $failure_time) < (60 * 60 * 24)) {
 161                         return false;
 162                 }
 163
 164                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 165                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 166                 //      return false;
 167
 168                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 169                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 170                         return false;
 171                 }
 172
 173                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 174                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 175                         return false;
 176                 }
 177
 178                 return true;
 179         }
 180
 181         /**
 182          * Checks the state of the given server.
 183          *
 184          * @param string  $server_url    URL of the given server
 185          * @param string  $network       Network value that is used, when detection failed
 186          * @param boolean $force         Force an update.
 187          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 188          *
 189          * @return boolean 'true' if server seems vital
 190          */
 191         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 192         {
 193                 $server_url = self::cleanURL($server_url);
 194
 195                 if ($server_url == '') {
 196                         return false;
 197                 }
 198
 199                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 200                 if (DBA::isResult($gserver)) {
 201                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 202                                 $fields = ['created' => DateTimeFormat::utcNow()];
 203                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 204                                 DBA::update('gserver', $fields, $condition);
 205                         }
 206
 207                         $last_contact = $gserver['last_contact'];
 208                         $last_failure = $gserver['last_failure'];
 209
 210                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 211                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 212                         if ($last_contact < DBA::NULL_DATETIME) {
 213                                 $last_contact = DBA::NULL_DATETIME;
 214                         }
 215
 216                         if ($last_failure < DBA::NULL_DATETIME) {
 217                                 $last_failure = DBA::NULL_DATETIME;
 218                         }
 219
 220                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 221                                 Logger::info('No update needed', ['server' => $server_url]);
 222                                 return ($last_contact >= $last_failure);
 223                         }
 224                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 225                 } else {
 226                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 227                 }
 228
 229                 return self::detect($server_url, $network, $only_nodeinfo);
 230         }
 231
 232         /**
 233          * Set failed server status
 234          *
 235          * @param string $url
 236          */
 237         private static function setFailure(string $url)
 238         {
 239                 if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 240                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow(), 'detection-method' => null],
 241                         ['nurl' => Strings::normaliseLink($url)]);
 242                         Logger::info('Set failed status for existing server', ['url' => $url]);
 243                         return;
 244                 }
 245                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 246                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 247                         'failed' => true, 'last_failure' => DateTimeFormat::utcNow()]);
 248                 Logger::info('Set failed status for new server', ['url' => $url]);
 249         }
 250
 251         /**
 252          * Remove unwanted content from the given URL
 253          *
 254          * @param string $url
 255          * @return string cleaned URL
 256          */
 257         public static function cleanURL(string $url)
 258         {
 259                 $url = trim($url, '/');
 260                 $url = str_replace('/index.php', '', $url);
 261
 262                 $urlparts = parse_url($url);
 263                 unset($urlparts['user']);
 264                 unset($urlparts['pass']);
 265                 unset($urlparts['query']);
 266                 unset($urlparts['fragment']);
 267                 return Network::unparseURL($urlparts);
 268         }
 269
 270         /**
 271          * Return the base URL
 272          *
 273          * @param string $url
 274          * @return string base URL
 275          */
 276         private static function getBaseURL(string $url)
 277         {
 278                 $urlparts = parse_url(self::cleanURL($url));
 279                 unset($urlparts['path']);
 280                 return Network::unparseURL($urlparts);
 281         }
 282
 283         /**
 284          * Detect server data (type, protocol, version number, ...)
 285          * The detected data is then updated or inserted in the gserver table.
 286          *
 287          * @param string  $url           URL of the given server
 288          * @param string  $network       Network value that is used, when detection failed
 289          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 290          *
 291          * @return boolean 'true' if server could be detected
 292          */
 293         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 294         {
 295                 Logger::info('Detect server type', ['server' => $url]);
 296                 $serverdata = ['detection-method' => self::DETECT_MANUAL];
 297
 298                 $original_url = $url;
 299
 300                 // Remove URL content that is not supposed to exist for a server url
 301                 $url = self::cleanURL($url);
 302
 303                 // Get base URL
 304                 $baseurl = self::getBaseURL($url);
 305
 306                 // If the URL missmatches, then we mark the old entry as failure
 307                 if ($url != $original_url) {
 308                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow()],
 309                                 ['nurl' => Strings::normaliseLink($original_url)]);
 310                 }
 311
 312                 // When a nodeinfo is present, we don't need to dig further
 313                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 314                 $curlResult = DI::httpRequest()->get($url . '/.well-known/nodeinfo', ['timeout' => $xrd_timeout]);
 315                 if ($curlResult->isTimeout()) {
 316                         self::setFailure($url);
 317                         return false;
 318                 }
 319
 320                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 321                 if ($only_nodeinfo && empty($nodeinfo)) {
 322                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 323                         self::setFailure($url);
 324                         return false;
 325                 }
 326
 327                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 328                 if (empty($nodeinfo)) {
 329                         $nodeinfo = self::fetchStatistics($url);
 330                 }
 331
 332                 // If that didn't work out well, we use some protocol specific endpoints
 333                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 334                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 335                         if (!empty($nodeinfo['detection-method'])) {
 336                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 337                         }
 338
 339                         // Fetch the landing page, possibly it reveals some data
 340                         if (empty($nodeinfo['network'])) {
 341                                 if ($baseurl == $url) {
 342                                         $basedata = $serverdata;
 343                                 } else {
 344                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 345                                 }
 346
 347                                 $curlResult = DI::httpRequest()->get($baseurl, ['timeout' => $xrd_timeout]);
 348                                 if ($curlResult->isSuccess()) {
 349                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 350                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 351                                 }
 352
 353                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 354                                         self::setFailure($url);
 355                                         return false;
 356                                 }
 357
 358                                 if ($baseurl == $url) {
 359                                         $serverdata = $basedata;
 360                                 } else {
 361                                         // When the base path doesn't seem to contain a social network we try the complete path.
 362                                         // Most detectable system have to be installed in the root directory.
 363                                         // We checked the base to avoid false positives.
 364                                         $curlResult = DI::httpRequest()->get($url, ['timeout' => $xrd_timeout]);
 365                                         if ($curlResult->isSuccess()) {
 366                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 367                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 368
 369                                                 $comparebase = $basedata;
 370                                                 unset($comparebase['info']);
 371                                                 unset($comparebase['site_name']);
 372                                                 $compareurl = $urldata;
 373                                                 unset($compareurl['info']);
 374                                                 unset($compareurl['site_name']);
 375
 376                                                 // We assume that no one will install the identical system in the root and a subfolder
 377                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 378                                                         $serverdata = $urldata;
 379                                                 }
 380                                         }
 381                                 }
 382                         }
 383
 384                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 385                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 386                         }
 387
 388                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 389                         // With this check we don't have to waste time and ressources for dead systems.
 390                         // Also this hopefully prevents us from receiving abuse messages.
 391                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 392                                 self::setFailure($url);
 393                                 return false;
 394                         }
 395
 396                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 397                                 $serverdata = self::detectFriendica($url, $serverdata);
 398                         }
 399
 400                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 401                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 402                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 403                         }
 404
 405                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 406                         if (empty($serverdata['network'])) {
 407                                 $serverdata = self::detectHubzilla($url, $serverdata);
 408                         }
 409
 410                         if (empty($serverdata['network'])) {
 411                                 $serverdata = self::detectNextcloud($url, $serverdata);
 412                         }
 413
 414                         if (empty($serverdata['network'])) {
 415                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 416                         }
 417
 418                         $serverdata = array_merge($nodeinfo, $serverdata);
 419                 } else {
 420                         $serverdata = $nodeinfo;
 421                 }
 422
 423                 // Detect the directory type
 424                 $serverdata['directory-type'] = self::DT_NONE;
 425                 $serverdata = self::checkPoCo($url, $serverdata);
 426                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 427
 428                 // We can't detect the network type. Possibly it is some system that we don't know yet
 429                 if (empty($serverdata['network'])) {
 430                         $serverdata['network'] = Protocol::PHANTOM;
 431                 }
 432
 433                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 434                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 435                         $serverdata['network'] = $network;
 436                 }
 437
 438                 $serverdata['url'] = $url;
 439                 $serverdata['nurl'] = Strings::normaliseLink($url);
 440
 441                 // We take the highest number that we do find
 442                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 443
 444                 // On an active server there has to be at least a single user
 445                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 446                         $registeredUsers = 1;
 447                 }
 448
 449                 if ($serverdata['network'] == Protocol::PHANTOM) {
 450                         $serverdata['registered-users'] = $registeredUsers;
 451                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 452                 }
 453
 454                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 455                 $serverdata['failed'] = false;
 456
 457                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 458                 if (!DBA::isResult($gserver)) {
 459                         $serverdata['created'] = DateTimeFormat::utcNow();
 460                         $ret = DBA::insert('gserver', $serverdata);
 461                         $id = DBA::lastInsertId();
 462                 } else {
 463                         // Don't override the network with 'unknown' when there had been a valid entry before
 464                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 465                                 unset($serverdata['network']);
 466                         }
 467
 468                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 469                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 470                         if (DBA::isResult($gserver)) {
 471                                 $id = $gserver['id'];
 472                         }
 473                 }
 474
 475                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 476                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 477                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 478                         $max_users = max($apcontacts, $contacts, $registeredUsers);
 479                         if ($max_users > $registeredUsers) {
 480                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 481                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 482                         }
 483                 }
 484
 485                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 486                         self::discoverRelay($url);
 487                 }
 488
 489                 return $ret;
 490         }
 491
 492         /**
 493          * Fetch relay data from a given server url
 494          *
 495          * @param string $server_url address of the server
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          */
 498         private static function discoverRelay(string $server_url)
 499         {
 500                 Logger::info('Discover relay data', ['server' => $server_url]);
 501
 502                 $curlResult = DI::httpRequest()->get($server_url . '/.well-known/x-social-relay');
 503                 if (!$curlResult->isSuccess()) {
 504                         return;
 505                 }
 506
 507                 $data = json_decode($curlResult->getBody(), true);
 508                 if (!is_array($data)) {
 509                         return;
 510                 }
 511
 512                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 513                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 514
 515                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 516                         $data['scope'] = '';
 517                         $data['subscribe'] = false;
 518                         $data['tags'] = [];
 519                 }
 520
 521                 $gserver = DBA::selectFirst('gserver', ['id', 'url', 'network', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 522                 if (!DBA::isResult($gserver)) {
 523                         return;
 524                 }
 525
 526                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 527                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 528                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 529                 }
 530
 531                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 532
 533                 if ($data['scope'] == 'tags') {
 534                         // Avoid duplicates
 535                         $tags = [];
 536                         foreach ($data['tags'] as $tag) {
 537                                 $tag = mb_strtolower($tag);
 538                                 if (strlen($tag) < 100) {
 539                                         $tags[$tag] = $tag;
 540                                 }
 541                         }
 542
 543                         foreach ($tags as $tag) {
 544                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 545                         }
 546                 }
 547
 548                 // Create or update the relay contact
 549                 $fields = [];
 550                 if (isset($data['protocols'])) {
 551                         if (isset($data['protocols']['diaspora'])) {
 552                                 $fields['network'] = Protocol::DIASPORA;
 553
 554                                 if (isset($data['protocols']['diaspora']['receive'])) {
 555                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 556                                 } elseif (is_string($data['protocols']['diaspora'])) {
 557                                         $fields['batch'] = $data['protocols']['diaspora'];
 558                                 }
 559                         }
 560
 561                         if (isset($data['protocols']['dfrn'])) {
 562                                 $fields['network'] = Protocol::DFRN;
 563
 564                                 if (isset($data['protocols']['dfrn']['receive'])) {
 565                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 566                                 } elseif (is_string($data['protocols']['dfrn'])) {
 567                                         $fields['batch'] = $data['protocols']['dfrn'];
 568                                 }
 569                         }
 570
 571                         if (isset($data['protocols']['activitypub'])) {
 572                                 $fields['network'] = Protocol::ACTIVITYPUB;
 573
 574                                 if (!empty($data['protocols']['activitypub']['actor'])) {
 575                                         $fields['url'] = $data['protocols']['activitypub']['actor'];
 576                                 }
 577                                 if (!empty($data['protocols']['activitypub']['receive'])) {
 578                                         $fields['batch'] = $data['protocols']['activitypub']['receive'];
 579                                 }
 580                         }
 581                 }
 582
 583                 Logger::info('Discovery ended', ['server' => $server_url, 'data' => $fields]);
 584
 585                 Relay::updateContact($gserver, $fields);
 586         }
 587
 588         /**
 589          * Fetch server data from '/statistics.json' on the given server
 590          *
 591          * @param string $url URL of the given server
 592          *
 593          * @return array server data
 594          */
 595         private static function fetchStatistics(string $url)
 596         {
 597                 $curlResult = DI::httpRequest()->get($url . '/statistics.json');
 598                 if (!$curlResult->isSuccess()) {
 599                         return [];
 600                 }
 601
 602                 $data = json_decode($curlResult->getBody(), true);
 603                 if (empty($data)) {
 604                         return [];
 605                 }
 606
 607                 $serverdata = ['detection-method' => self::DETECT_STATISTICS_JSON];
 608
 609                 if (!empty($data['version'])) {
 610                         $serverdata['version'] = $data['version'];
 611                         // Version numbers on statistics.json are presented with additional info, e.g.:
 612                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 613                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 614                 }
 615
 616                 if (!empty($data['name'])) {
 617                         $serverdata['site_name'] = $data['name'];
 618                 }
 619
 620                 if (!empty($data['network'])) {
 621                         $serverdata['platform'] = strtolower($data['network']);
 622
 623                         if ($serverdata['platform'] == 'diaspora') {
 624                                 $serverdata['network'] = Protocol::DIASPORA;
 625                         } elseif ($serverdata['platform'] == 'friendica') {
 626                                 $serverdata['network'] = Protocol::DFRN;
 627                         } elseif ($serverdata['platform'] == 'hubzilla') {
 628                                 $serverdata['network'] = Protocol::ZOT;
 629                         } elseif ($serverdata['platform'] == 'redmatrix') {
 630                                 $serverdata['network'] = Protocol::ZOT;
 631                         }
 632                 }
 633
 634
 635                 if (!empty($data['registrations_open'])) {
 636                         $serverdata['register_policy'] = Register::OPEN;
 637                 } else {
 638                         $serverdata['register_policy'] = Register::CLOSED;
 639                 }
 640
 641                 return $serverdata;
 642         }
 643
 644         /**
 645          * Detect server type by using the nodeinfo data
 646          *
 647          * @param string     $url        address of the server
 648          * @param CurlResult $curlResult
 649          * @return array Server data
 650          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 651          */
 652         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 653         {
 654                 if (!$curlResult->isSuccess()) {
 655                         return [];
 656                 }
 657
 658                 $nodeinfo = json_decode($curlResult->getBody(), true);
 659
 660                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 661                         return [];
 662                 }
 663
 664                 $nodeinfo1_url = '';
 665                 $nodeinfo2_url = '';
 666
 667                 foreach ($nodeinfo['links'] as $link) {
 668                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 669                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 670                                 continue;
 671                         }
 672                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 673                                 $nodeinfo1_url = $link['href'];
 674                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 675                                 $nodeinfo2_url = $link['href'];
 676                         }
 677                 }
 678
 679                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 680                         return [];
 681                 }
 682
 683                 $server = [];
 684
 685                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 686                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 687                         $server = self::parseNodeinfo2($nodeinfo2_url);
 688                 }
 689
 690                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 691                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 692                         $server = self::parseNodeinfo1($nodeinfo1_url);
 693                 }
 694
 695                 return $server;
 696         }
 697
 698         /**
 699          * Parses Nodeinfo 1
 700          *
 701          * @param string $nodeinfo_url address of the nodeinfo path
 702          * @return array Server data
 703          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 704          */
 705         private static function parseNodeinfo1(string $nodeinfo_url)
 706         {
 707                 $curlResult = DI::httpRequest()->get($nodeinfo_url);
 708
 709                 if (!$curlResult->isSuccess()) {
 710                         return [];
 711                 }
 712
 713                 $nodeinfo = json_decode($curlResult->getBody(), true);
 714
 715                 if (!is_array($nodeinfo)) {
 716                         return [];
 717                 }
 718
 719                 $server = ['detection-method' => self::DETECT_NODEINFO_1,
 720                         'register_policy' => Register::CLOSED];
 721
 722                 if (!empty($nodeinfo['openRegistrations'])) {
 723                         $server['register_policy'] = Register::OPEN;
 724                 }
 725
 726                 if (is_array($nodeinfo['software'])) {
 727                         if (!empty($nodeinfo['software']['name'])) {
 728                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 729                         }
 730
 731                         if (!empty($nodeinfo['software']['version'])) {
 732                                 $server['version'] = $nodeinfo['software']['version'];
 733                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 734                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 735                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 736                         }
 737                 }
 738
 739                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 740                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 741                 }
 742
 743                 if (!empty($nodeinfo['usage']['users']['total'])) {
 744                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 745                 }
 746
 747                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 748                         $protocols = [];
 749                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 750                                 $protocols[$protocol] = true;
 751                         }
 752
 753                         if (!empty($protocols['friendica'])) {
 754                                 $server['network'] = Protocol::DFRN;
 755                         } elseif (!empty($protocols['activitypub'])) {
 756                                 $server['network'] = Protocol::ACTIVITYPUB;
 757                         } elseif (!empty($protocols['diaspora'])) {
 758                                 $server['network'] = Protocol::DIASPORA;
 759                         } elseif (!empty($protocols['ostatus'])) {
 760                                 $server['network'] = Protocol::OSTATUS;
 761                         } elseif (!empty($protocols['gnusocial'])) {
 762                                 $server['network'] = Protocol::OSTATUS;
 763                         } elseif (!empty($protocols['zot'])) {
 764                                 $server['network'] = Protocol::ZOT;
 765                         }
 766                 }
 767
 768                 if (empty($server)) {
 769                         return [];
 770                 }
 771
 772                 return $server;
 773         }
 774
 775         /**
 776          * Parses Nodeinfo 2
 777          *
 778          * @param string $nodeinfo_url address of the nodeinfo path
 779          * @return array Server data
 780          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 781          */
 782         private static function parseNodeinfo2(string $nodeinfo_url)
 783         {
 784                 $curlResult = DI::httpRequest()->get($nodeinfo_url);
 785                 if (!$curlResult->isSuccess()) {
 786                         return [];
 787                 }
 788
 789                 $nodeinfo = json_decode($curlResult->getBody(), true);
 790
 791                 if (!is_array($nodeinfo)) {
 792                         return [];
 793                 }
 794
 795                 $server = ['detection-method' => self::DETECT_NODEINFO_2,
 796                         'register_policy' => Register::CLOSED];
 797
 798                 if (!empty($nodeinfo['openRegistrations'])) {
 799                         $server['register_policy'] = Register::OPEN;
 800                 }
 801
 802                 if (is_array($nodeinfo['software'])) {
 803                         if (!empty($nodeinfo['software']['name'])) {
 804                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 805                         }
 806
 807                         if (!empty($nodeinfo['software']['version'])) {
 808                                 $server['version'] = $nodeinfo['software']['version'];
 809                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 810                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 811                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 812                         }
 813                 }
 814
 815                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 816                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 817                 }
 818
 819                 if (!empty($nodeinfo['usage']['users']['total'])) {
 820                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 821                 }
 822
 823                 if (!empty($nodeinfo['protocols'])) {
 824                         $protocols = [];
 825                         foreach ($nodeinfo['protocols'] as $protocol) {
 826                                 $protocols[$protocol] = true;
 827                         }
 828
 829                         if (!empty($protocols['dfrn'])) {
 830                                 $server['network'] = Protocol::DFRN;
 831                         } elseif (!empty($protocols['activitypub'])) {
 832                                 $server['network'] = Protocol::ACTIVITYPUB;
 833                         } elseif (!empty($protocols['diaspora'])) {
 834                                 $server['network'] = Protocol::DIASPORA;
 835                         } elseif (!empty($protocols['ostatus'])) {
 836                                 $server['network'] = Protocol::OSTATUS;
 837                         } elseif (!empty($protocols['gnusocial'])) {
 838                                 $server['network'] = Protocol::OSTATUS;
 839                         } elseif (!empty($protocols['zot'])) {
 840                                 $server['network'] = Protocol::ZOT;
 841                         }
 842                 }
 843
 844                 if (empty($server)) {
 845                         return [];
 846                 }
 847
 848                 return $server;
 849         }
 850
 851         /**
 852          * Fetch server information from a 'siteinfo.json' file on the given server
 853          *
 854          * @param string $url        URL of the given server
 855          * @param array  $serverdata array with server data
 856          *
 857          * @return array server data
 858          */
 859         private static function fetchSiteinfo(string $url, array $serverdata)
 860         {
 861                 $curlResult = DI::httpRequest()->get($url . '/siteinfo.json');
 862                 if (!$curlResult->isSuccess()) {
 863                         return $serverdata;
 864                 }
 865
 866                 $data = json_decode($curlResult->getBody(), true);
 867                 if (empty($data)) {
 868                         return $serverdata;
 869                 }
 870
 871                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
 872                         $serverdata['detection-method'] = self::DETECT_SITEINFO_JSON;
 873                 }
 874
 875                 if (!empty($data['url'])) {
 876                         $serverdata['platform'] = strtolower($data['platform']);
 877                         $serverdata['version'] = $data['version'];
 878                 }
 879
 880                 if (!empty($data['plugins'])) {
 881                         if (in_array('pubcrawl', $data['plugins'])) {
 882                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 883                         } elseif (in_array('diaspora', $data['plugins'])) {
 884                                 $serverdata['network'] = Protocol::DIASPORA;
 885                         } elseif (in_array('gnusoc', $data['plugins'])) {
 886                                 $serverdata['network'] = Protocol::OSTATUS;
 887                         } else {
 888                                 $serverdata['network'] = Protocol::ZOT;
 889                         }
 890                 }
 891
 892                 if (!empty($data['site_name'])) {
 893                         $serverdata['site_name'] = $data['site_name'];
 894                 }
 895
 896                 if (!empty($data['channels_total'])) {
 897                         $serverdata['registered-users'] = $data['channels_total'];
 898                 }
 899
 900                 if (!empty($data['register_policy'])) {
 901                         switch ($data['register_policy']) {
 902                                 case 'REGISTER_OPEN':
 903                                         $serverdata['register_policy'] = Register::OPEN;
 904                                         break;
 905
 906                                 case 'REGISTER_APPROVE':
 907                                         $serverdata['register_policy'] = Register::APPROVE;
 908                                         break;
 909
 910                                 case 'REGISTER_CLOSED':
 911                                 default:
 912                                         $serverdata['register_policy'] = Register::CLOSED;
 913                                         break;
 914                         }
 915                 }
 916
 917                 return $serverdata;
 918         }
 919
 920         /**
 921          * Checks if the server contains a valid host meta file
 922          *
 923          * @param string $url URL of the given server
 924          *
 925          * @return boolean 'true' if the server seems to be vital
 926          */
 927         private static function validHostMeta(string $url)
 928         {
 929                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 930                 $curlResult = DI::httpRequest()->get($url . '/.well-known/host-meta', ['timeout' => $xrd_timeout]);
 931                 if (!$curlResult->isSuccess()) {
 932                         return false;
 933                 }
 934
 935                 $xrd = XML::parseString($curlResult->getBody());
 936                 if (!is_object($xrd)) {
 937                         return false;
 938                 }
 939
 940                 $elements = XML::elementToArray($xrd);
 941                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 942                         return false;
 943                 }
 944
 945                 $valid = false;
 946                 foreach ($elements['xrd']['link'] as $link) {
 947                         // When there is more than a single "link" element, the array looks slightly different
 948                         if (!empty($link['@attributes'])) {
 949                                 $link = $link['@attributes'];
 950                         }
 951
 952                         if (empty($link['rel']) || empty($link['template'])) {
 953                                 continue;
 954                         }
 955
 956                         if ($link['rel'] == 'lrdd') {
 957                                 // When the webfinger host is the same like the system host, it should be ok.
 958                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 959                         }
 960                 }
 961
 962                 return $valid;
 963         }
 964
 965         /**
 966          * Detect the network of the given server via their known contacts
 967          *
 968          * @param string $url        URL of the given server
 969          * @param array  $serverdata array with server data
 970          *
 971          * @return array server data
 972          */
 973         private static function detectNetworkViaContacts(string $url, array $serverdata)
 974         {
 975                 $contacts = [];
 976
 977                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 978                 while ($apcontact = DBA::fetch($apcontacts)) {
 979                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 980                 }
 981                 DBA::close($apcontacts);
 982
 983                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 984                 while ($pcontact = DBA::fetch($pcontacts)) {
 985                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 986                 }
 987                 DBA::close($pcontacts);
 988
 989                 if (empty($contacts)) {
 990                         return $serverdata;
 991                 }
 992
 993                 foreach ($contacts as $contact) {
 994                         $probed = Contact::getByURL($contact);
 995                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
 996                                 $serverdata['network'] = $probed['network'];
 997                                 break;
 998                         }
 999                 }
1000
1001                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
1002
1003                 return $serverdata;
1004         }
1005
1006         /**
1007          * Checks if the given server does have a '/poco' endpoint.
1008          * This is used for the 'PortableContact' functionality,
1009          * which is used by both Friendica and Hubzilla.
1010          *
1011          * @param string $url        URL of the given server
1012          * @param array  $serverdata array with server data
1013          *
1014          * @return array server data
1015          */
1016         private static function checkPoCo(string $url, array $serverdata)
1017         {
1018                 $serverdata['poco'] = '';
1019
1020                 $curlResult = DI::httpRequest()->get($url . '/poco');
1021                 if (!$curlResult->isSuccess()) {
1022                         return $serverdata;
1023                 }
1024
1025                 $data = json_decode($curlResult->getBody(), true);
1026                 if (empty($data)) {
1027                         return $serverdata;
1028                 }
1029
1030                 if (!empty($data['totalResults'])) {
1031                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1032                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
1033                         $serverdata['directory-type'] = self::DT_POCO;
1034                         $serverdata['poco'] = $url . '/poco';
1035                 }
1036
1037                 return $serverdata;
1038         }
1039
1040         /**
1041          * Checks if the given server does have a Mastodon style directory endpoint.
1042          *
1043          * @param string $url        URL of the given server
1044          * @param array  $serverdata array with server data
1045          *
1046          * @return array server data
1047          */
1048         public static function checkMastodonDirectory(string $url, array $serverdata)
1049         {
1050                 $curlResult = DI::httpRequest()->get($url . '/api/v1/directory?limit=1');
1051                 if (!$curlResult->isSuccess()) {
1052                         return $serverdata;
1053                 }
1054
1055                 $data = json_decode($curlResult->getBody(), true);
1056                 if (empty($data)) {
1057                         return $serverdata;
1058                 }
1059
1060                 if (count($data) == 1) {
1061                         $serverdata['directory-type'] = self::DT_MASTODON;
1062                 }
1063
1064                 return $serverdata;
1065         }
1066
1067         /**
1068          * Detects the version number of a given server when it was a NextCloud installation
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 detectNextcloud(string $url, array $serverdata)
1076         {
1077                 $curlResult = DI::httpRequest()->get($url . '/status.php');
1078
1079                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1080                         return $serverdata;
1081                 }
1082
1083                 $data = json_decode($curlResult->getBody(), true);
1084                 if (empty($data)) {
1085                         return $serverdata;
1086                 }
1087
1088                 if (!empty($data['version'])) {
1089                         $serverdata['platform'] = 'nextcloud';
1090                         $serverdata['version'] = $data['version'];
1091                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1092
1093                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1094                                 $serverdata['detection-method'] = self::DETECT_STATUS_PHP;
1095                         }
1096                 }
1097
1098                 return $serverdata;
1099         }
1100
1101         /**
1102          * Detects data from a given server url if it was a mastodon alike system
1103          *
1104          * @param string $url        URL of the given server
1105          * @param array  $serverdata array with server data
1106          *
1107          * @return array server data
1108          */
1109         private static function detectMastodonAlikes(string $url, array $serverdata)
1110         {
1111                 $curlResult = DI::httpRequest()->get($url . '/api/v1/instance');
1112
1113                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1114                         return $serverdata;
1115                 }
1116
1117                 $data = json_decode($curlResult->getBody(), true);
1118                 if (empty($data)) {
1119                         return $serverdata;
1120                 }
1121
1122                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1123                         $serverdata['detection-method'] = self::DETECT_MASTODON_API;
1124                 }
1125
1126                 if (!empty($data['version'])) {
1127                         $serverdata['platform'] = 'mastodon';
1128                         $serverdata['version'] = $data['version'] ?? '';
1129                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1130                 }
1131
1132                 if (!empty($data['title'])) {
1133                         $serverdata['site_name'] = $data['title'];
1134                 }
1135
1136                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
1137                         $serverdata['platform'] = 'mastodon';
1138                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1139                 }
1140
1141                 if (!empty($data['description'])) {
1142                         $serverdata['info'] = trim($data['description']);
1143                 }
1144
1145                 if (!empty($data['stats']['user_count'])) {
1146                         $serverdata['registered-users'] = $data['stats']['user_count'];
1147                 }
1148
1149                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1150                         $serverdata['platform'] = strtolower($matches[1]);
1151                         $serverdata['version'] = $matches[2];
1152                 }
1153
1154                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1155                         $serverdata['platform'] = 'pleroma';
1156                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1157                 }
1158
1159                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1160                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1161                         $serverdata['platform'] = 'pleroma';
1162                 }
1163
1164                 return $serverdata;
1165         }
1166
1167         /**
1168          * Detects data from typical Hubzilla endpoints
1169          *
1170          * @param string $url        URL of the given server
1171          * @param array  $serverdata array with server data
1172          *
1173          * @return array server data
1174          */
1175         private static function detectHubzilla(string $url, array $serverdata)
1176         {
1177                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/config.json');
1178                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1179                         return $serverdata;
1180                 }
1181
1182                 $data = json_decode($curlResult->getBody(), true);
1183                 if (empty($data) || empty($data['site'])) {
1184                         return $serverdata;
1185                 }
1186
1187                 if (!empty($data['site']['name'])) {
1188                         $serverdata['site_name'] = $data['site']['name'];
1189                 }
1190
1191                 if (!empty($data['site']['platform'])) {
1192                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1193                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1194                         $serverdata['network'] = Protocol::ZOT;
1195                 }
1196
1197                 if (!empty($data['site']['hubzilla'])) {
1198                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1199                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1200                         $serverdata['network'] = Protocol::ZOT;
1201                 }
1202
1203                 if (!empty($data['site']['redmatrix'])) {
1204                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1205                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1206                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1207                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1208                         }
1209
1210                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1211                         $serverdata['network'] = Protocol::ZOT;
1212                 }
1213
1214                 $private = false;
1215                 $inviteonly = false;
1216                 $closed = false;
1217
1218                 if (!empty($data['site']['closed'])) {
1219                         $closed = self::toBoolean($data['site']['closed']);
1220                 }
1221
1222                 if (!empty($data['site']['private'])) {
1223                         $private = self::toBoolean($data['site']['private']);
1224                 }
1225
1226                 if (!empty($data['site']['inviteonly'])) {
1227                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1228                 }
1229
1230                 if (!$closed && !$private and $inviteonly) {
1231                         $serverdata['register_policy'] = Register::APPROVE;
1232                 } elseif (!$closed && !$private) {
1233                         $serverdata['register_policy'] = Register::OPEN;
1234                 } else {
1235                         $serverdata['register_policy'] = Register::CLOSED;
1236                 }
1237
1238                 if (!empty($serverdata['network']) && in_array($serverdata['detection-method'],
1239                         [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1240                         $serverdata['detection-method'] = self::DETECT_CONFIG_JSON;
1241                 }
1242
1243                 return $serverdata;
1244         }
1245
1246         /**
1247          * Converts input value to a boolean value
1248          *
1249          * @param string|integer $val
1250          *
1251          * @return boolean
1252          */
1253         private static function toBoolean($val)
1254         {
1255                 if (($val == 'true') || ($val == 1)) {
1256                         return true;
1257                 } elseif (($val == 'false') || ($val == 0)) {
1258                         return false;
1259                 }
1260
1261                 return $val;
1262         }
1263
1264         /**
1265          * Detect if the URL belongs to a GNU Social server
1266          *
1267          * @param string $url        URL of the given server
1268          * @param array  $serverdata array with server data
1269          *
1270          * @return array server data
1271          */
1272         private static function detectGNUSocial(string $url, array $serverdata)
1273         {
1274                 // Test for GNU Social
1275                 $curlResult = DI::httpRequest()->get($url . '/api/gnusocial/version.json');
1276                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1277                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1278                         $serverdata['platform'] = 'gnusocial';
1279                         // Remove junk that some GNU Social servers return
1280                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1281                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1282                         $serverdata['version'] = trim($serverdata['version'], '"');
1283                         $serverdata['network'] = Protocol::OSTATUS;
1284
1285                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1286                                 $serverdata['detection-method'] = self::DETECT_GNUSOCIAL;
1287                         }
1288
1289                         return $serverdata;
1290                 }
1291
1292                 // Test for Statusnet
1293                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/version.json');
1294                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1295                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1296
1297                         // Remove junk that some GNU Social servers return
1298                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1299                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1300                         $serverdata['version'] = trim($serverdata['version'], '"');
1301
1302                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1303                                 $serverdata['platform'] = 'pleroma';
1304                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1305                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1306                         } else {
1307                                 $serverdata['platform'] = 'statusnet';
1308                                 $serverdata['network'] = Protocol::OSTATUS;
1309                         }
1310
1311                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1312                                 $serverdata['detection-method'] = self::DETECT_STATUSNET;
1313                         }
1314                 }
1315
1316                 return $serverdata;
1317         }
1318
1319         /**
1320          * Detect if the URL belongs to a Friendica server
1321          *
1322          * @param string $url        URL of the given server
1323          * @param array  $serverdata array with server data
1324          *
1325          * @return array server data
1326          */
1327         private static function detectFriendica(string $url, array $serverdata)
1328         {
1329                 $curlResult = DI::httpRequest()->get($url . '/friendica/json');
1330                 if (!$curlResult->isSuccess()) {
1331                         $curlResult = DI::httpRequest()->get($url . '/friendika/json');
1332                         $friendika = true;
1333                         $platform = 'Friendika';
1334                 } else {
1335                         $friendika = false;
1336                         $platform = 'Friendica';
1337                 }
1338
1339                 if (!$curlResult->isSuccess()) {
1340                         return $serverdata;
1341                 }
1342
1343                 $data = json_decode($curlResult->getBody(), true);
1344                 if (empty($data) || empty($data['version'])) {
1345                         return $serverdata;
1346                 }
1347
1348                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1349                         $serverdata['detection-method'] = $friendika ? self::DETECT_FRIENDIKA : self::DETECT_FRIENDICA;
1350                 }
1351
1352                 $serverdata['network'] = Protocol::DFRN;
1353                 $serverdata['version'] = $data['version'];
1354
1355                 if (!empty($data['no_scrape_url'])) {
1356                         $serverdata['noscrape'] = $data['no_scrape_url'];
1357                 }
1358
1359                 if (!empty($data['site_name'])) {
1360                         $serverdata['site_name'] = $data['site_name'];
1361                 }
1362
1363                 if (!empty($data['info'])) {
1364                         $serverdata['info'] = trim($data['info']);
1365                 }
1366
1367                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1368                 switch ($register_policy) {
1369                         case 'REGISTER_OPEN':
1370                                 $serverdata['register_policy'] = Register::OPEN;
1371                                 break;
1372
1373                         case 'REGISTER_APPROVE':
1374                                 $serverdata['register_policy'] = Register::APPROVE;
1375                                 break;
1376
1377                         case 'REGISTER_CLOSED':
1378                         case 'REGISTER_INVITATION':
1379                                 $serverdata['register_policy'] = Register::CLOSED;
1380                                 break;
1381                         default:
1382                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1383                                 $serverdata['register_policy'] = Register::CLOSED;
1384                                 break;
1385                 }
1386
1387                 $serverdata['platform'] = strtolower($data['platform'] ?? $platform);
1388
1389                 return $serverdata;
1390         }
1391
1392         /**
1393          * Analyses the landing page of a given server for hints about type and system of that server
1394          *
1395          * @param object $curlResult result of curl execution
1396          * @param array  $serverdata array with server data
1397          * @param string $url        Server URL
1398          *
1399          * @return array server data
1400          */
1401         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1402         {
1403                 $doc = new DOMDocument();
1404                 @$doc->loadHTML($curlResult->getBody());
1405                 $xpath = new DOMXPath($doc);
1406
1407                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1408                 if (!empty($title)) {
1409                         $serverdata['site_name'] = $title;
1410                 }
1411
1412                 $list = $xpath->query('//meta[@name]');
1413
1414                 foreach ($list as $node) {
1415                         $attr = [];
1416                         if ($node->attributes->length) {
1417                                 foreach ($node->attributes as $attribute) {
1418                                         $value = trim($attribute->value);
1419                                         if (empty($value)) {
1420                                                 continue;
1421                                         }
1422
1423                                         $attr[$attribute->name] = $value;
1424                                 }
1425
1426                                 if (empty($attr['name']) || empty($attr['content'])) {
1427                                         continue;
1428                                 }
1429                         }
1430
1431                         if ($attr['name'] == 'description') {
1432                                 $serverdata['info'] = $attr['content'];
1433                         }
1434
1435                         if (in_array($attr['name'], ['application-name', 'al:android:app_name', 'al:ios:app_name',
1436                                 'twitter:app:name:googleplay', 'twitter:app:name:iphone', 'twitter:app:name:ipad'])) {
1437                                 $serverdata['platform'] = strtolower($attr['content']);
1438                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1439                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1440                                 }
1441                         }
1442                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1443                                 $serverdata['platform'] = strtolower($attr['content']);
1444                                 $version_part = explode(' ', $attr['content']);
1445
1446                                 if (count($version_part) == 2) {
1447                                         if (in_array($version_part[0], ['WordPress'])) {
1448                                                 $serverdata['platform'] = strtolower($version_part[0]);
1449                                                 $serverdata['version'] = $version_part[1];
1450
1451                                                 // We still do need a reliable test if some AP plugin is activated
1452                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1453                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1454                                                 } else {
1455                                                         $serverdata['network'] = Protocol::FEED;
1456                                                 }
1457
1458                                                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1459                                                         $serverdata['detection-method'] = self::DETECT_BODY;
1460                                                 }
1461                                         }
1462                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1463                                                 $serverdata['platform'] = strtolower($version_part[0]);
1464                                                 $serverdata['version'] = $version_part[1];
1465                                                 $serverdata['network'] = Protocol::DFRN;
1466                                         }
1467                                 }
1468                         }
1469                 }
1470
1471                 $list = $xpath->query('//meta[@property]');
1472
1473                 foreach ($list as $node) {
1474                         $attr = [];
1475                         if ($node->attributes->length) {
1476                                 foreach ($node->attributes as $attribute) {
1477                                         $value = trim($attribute->value);
1478                                         if (empty($value)) {
1479                                                 continue;
1480                                         }
1481
1482                                         $attr[$attribute->name] = $value;
1483                                 }
1484
1485                                 if (empty($attr['property']) || empty($attr['content'])) {
1486                                         continue;
1487                                 }
1488                         }
1489
1490                         if ($attr['property'] == 'og:site_name') {
1491                                 $serverdata['site_name'] = $attr['content'];
1492                         }
1493
1494                         if ($attr['property'] == 'og:description') {
1495                                 $serverdata['info'] = $attr['content'];
1496                         }
1497
1498                         if ($attr['property'] == 'og:platform') {
1499                                 $serverdata['platform'] = strtolower($attr['content']);
1500
1501                                 if (in_array($attr['content'], ['PeerTube'])) {
1502                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1503                                 }
1504                         }
1505
1506                         if ($attr['property'] == 'generator') {
1507                                 $serverdata['platform'] = strtolower($attr['content']);
1508
1509                                 if (in_array($attr['content'], ['hubzilla'])) {
1510                                         // We later check which compatible protocol modules are loaded.
1511                                         $serverdata['network'] = Protocol::ZOT;
1512                                 }
1513                         }
1514                 }
1515
1516                 if (!empty($serverdata['network']) && ($serverdata['detection-method'] == self::DETECT_MANUAL)) {
1517                         $serverdata['detection-method'] = self::DETECT_BODY;
1518                 }
1519
1520                 return $serverdata;
1521         }
1522
1523         /**
1524          * Analyses the header data of a given server for hints about type and system of that server
1525          *
1526          * @param object $curlResult result of curl execution
1527          * @param array  $serverdata array with server data
1528          *
1529          * @return array server data
1530          */
1531         private static function analyseRootHeader($curlResult, array $serverdata)
1532         {
1533                 if ($curlResult->getHeader('server') == 'Mastodon') {
1534                         $serverdata['platform'] = 'mastodon';
1535                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1536                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1537                         $serverdata['platform'] = 'diaspora';
1538                         $serverdata['network'] = Protocol::DIASPORA;
1539                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1540                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1541                         $serverdata['platform'] = 'friendica';
1542                         $serverdata['network'] = Protocol::DFRN;
1543                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1544                 } else {
1545                         return $serverdata;
1546                 }
1547
1548                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1549                         $serverdata['detection-method'] = self::DETECT_HEADER;
1550                 }
1551
1552                 return $serverdata;
1553         }
1554
1555         /**
1556          * Test if the body contains valid content
1557          *
1558          * @param string $body
1559          * @return boolean
1560          */
1561         private static function invalidBody(string $body)
1562         {
1563                 // Currently we only test for a HTML element.
1564                 // Possibly we enhance this in the future.
1565                 return !strpos($body, '>');
1566         }
1567
1568         /**
1569          * Update GServer entries
1570          */
1571         public static function discover()
1572         {
1573                 // Update the server list
1574                 self::discoverFederation();
1575
1576                 $no_of_queries = 5;
1577
1578                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1579
1580                 if ($requery_days == 0) {
1581                         $requery_days = 7;
1582                 }
1583
1584                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1585
1586                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`, `directory-type`
1587                         FROM `gserver`
1588                         WHERE NOT `failed`
1589                         AND `directory-type` != ?
1590                         AND `last_poco_query` < ?
1591                         ORDER BY RAND()", self::DT_NONE, $last_update
1592                 );
1593
1594                 while ($gserver = DBA::fetch($gservers)) {
1595                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1596                                 // The server is not reachable? Okay, then we will try it later
1597                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1598                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1599                                 continue;
1600                         }
1601
1602                         Logger::info('Update peer list', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1603                         Worker::add(PRIORITY_LOW, 'UpdateServerPeers', $gserver['url']);
1604
1605                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1606                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1607
1608                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1609                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1610
1611                         if (--$no_of_queries == 0) {
1612                                 break;
1613                         }
1614                 }
1615
1616                 DBA::close($gservers);
1617         }
1618
1619         /**
1620          * Discover federated servers
1621          */
1622         private static function discoverFederation()
1623         {
1624                 $last = DI::config()->get('poco', 'last_federation_discovery');
1625
1626                 if ($last) {
1627                         $next = $last + (24 * 60 * 60);
1628
1629                         if ($next > time()) {
1630                                 return;
1631                         }
1632                 }
1633
1634                 // Discover federated servers
1635                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1636                 foreach ($protocols as $protocol) {
1637                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1638                         $curlResult = DI::httpRequest()->fetch('https://the-federation.info/graphql?query=' . urlencode($query));
1639                         if (!empty($curlResult)) {
1640                                 $data = json_decode($curlResult, true);
1641                                 if (!empty($data['data']['nodes'])) {
1642                                         foreach ($data['data']['nodes'] as $server) {
1643                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1644                                                 Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1645                                         }
1646                                 }
1647                         }
1648                 }
1649
1650                 // Disvover Mastodon servers
1651                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1652
1653                 if (!empty($accesstoken)) {
1654                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1655                         $header = ['Authorization: Bearer '.$accesstoken];
1656                         $curlResult = DI::httpRequest()->get($api, ['header' => $header]);
1657
1658                         if ($curlResult->isSuccess()) {
1659                                 $servers = json_decode($curlResult->getBody(), true);
1660
1661                                 foreach ($servers['instances'] as $server) {
1662                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1663                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1664                                 }
1665                         }
1666                 }
1667
1668                 DI::config()->set('poco', 'last_federation_discovery', time());
1669         }
1670 }