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