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\Protocol;
  27 use Friendica\Core\Worker;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Module\Register;
  31 use Friendica\Network\CurlResult;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\DateTimeFormat;
  34 use Friendica\Util\Strings;
  35 use Friendica\Util\XML;
  36 use Friendica\Core\Logger;
  37 use Friendica\Protocol\PortableContact;
  38 use Friendica\Protocol\Diaspora;
  39 use Friendica\Network\Probe;
  40
  41 /**
  42  * This class handles GServer related functions
  43  */
  44 class GServer
  45 {
  46         // Directory types
  47         const DT_NONE = 0;
  48         const DT_POCO = 1;
  49         const DT_MASTODON = 2;
  50         /**
  51          * Checks if the given server is reachable
  52          *
  53          * @param string  $profile URL of the given profile
  54          * @param string  $server  URL of the given server (If empty, taken from profile)
  55          * @param string  $network Network value that is used, when detection failed
  56          * @param boolean $force   Force an update.
  57          *
  58          * @return boolean 'true' if server seems vital
  59          */
  60         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
  61         {
  62                 if ($server == '') {
  63                         $server = GContact::getBasepath($profile);
  64                 }
  65
  66                 if ($server == '') {
  67                         return true;
  68                 }
  69
  70                 return self::check($server, $network, $force);
  71         }
  72
  73         /**
  74          * Decides if a server needs to be updated, based upon several date fields
  75          *
  76          * @param date $created      Creation date of that server entry
  77          * @param date $updated      When had the server entry be updated
  78          * @param date $last_failure Last failure when contacting that server
  79          * @param date $last_contact Last time the server had been contacted
  80          *
  81          * @return boolean Does the server record needs an update?
  82          */
  83         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
  84         {
  85                 $now = strtotime(DateTimeFormat::utcNow());
  86
  87                 if ($updated > $last_contact) {
  88                         $contact_time = strtotime($updated);
  89                 } else {
  90                         $contact_time = strtotime($last_contact);
  91                 }
  92
  93                 $failure_time = strtotime($last_failure);
  94                 $created_time = strtotime($created);
  95
  96                 // If there is no "created" time then use the current time
  97                 if ($created_time <= 0) {
  98                         $created_time = $now;
  99                 }
 100
 101                 // If the last contact was less than 24 hours then don't update
 102                 if (($now - $contact_time) < (60 * 60 * 24)) {
 103                         return false;
 104                 }
 105
 106                 // If the last failure was less than 24 hours then don't update
 107                 if (($now - $failure_time) < (60 * 60 * 24)) {
 108                         return false;
 109                 }
 110
 111                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 112                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 113                 //      return false;
 114
 115                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 116                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 117                         return false;
 118                 }
 119
 120                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 121                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 122                         return false;
 123                 }
 124
 125                 return true;
 126         }
 127
 128         /**
 129          * Checks the state of the given server.
 130          *
 131          * @param string  $server_url    URL of the given server
 132          * @param string  $network       Network value that is used, when detection failed
 133          * @param boolean $force         Force an update.
 134          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 135          *
 136          * @return boolean 'true' if server seems vital
 137          */
 138         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 139         {
 140                 // Unify the server address
 141                 $server_url = trim($server_url, '/');
 142                 $server_url = str_replace('/index.php', '', $server_url);
 143
 144                 if ($server_url == '') {
 145                         return false;
 146                 }
 147
 148                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 149                 if (DBA::isResult($gserver)) {
 150                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 151                                 $fields = ['created' => DateTimeFormat::utcNow()];
 152                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 153                                 DBA::update('gserver', $fields, $condition);
 154                         }
 155
 156                         $last_contact = $gserver['last_contact'];
 157                         $last_failure = $gserver['last_failure'];
 158
 159                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 160                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 161                         if ($last_contact < DBA::NULL_DATETIME) {
 162                                 $last_contact = DBA::NULL_DATETIME;
 163                         }
 164
 165                         if ($last_failure < DBA::NULL_DATETIME) {
 166                                 $last_failure = DBA::NULL_DATETIME;
 167                         }
 168
 169                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 170                                 Logger::info('No update needed', ['server' => $server_url]);
 171                                 return ($last_contact >= $last_failure);
 172                         }
 173                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 174                 } else {
 175                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 176                 }
 177
 178                 return self::detect($server_url, $network, $only_nodeinfo);
 179         }
 180
 181         /**
 182          * Set failed server status
 183          *
 184          * @param string $url
 185          */
 186         private static function setFailure(string $url)
 187         {
 188                 if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 189                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 190                         Logger::info('Set failed status for existing server', ['url' => $url]);
 191                         return;
 192                 }
 193                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 194                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 195                         'last_failure' => DateTimeFormat::utcNow()]);
 196                 Logger::info('Set failed status for new server', ['url' => $url]);
 197         }
 198
 199         /**
 200          * Detect server data (type, protocol, version number, ...)
 201          * The detected data is then updated or inserted in the gserver table.
 202          *
 203          * @param string  $url           URL of the given server
 204          * @param string  $network       Network value that is used, when detection failed
 205          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 206          *
 207          * @return boolean 'true' if server could be detected
 208          */
 209         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 210         {
 211                 Logger::info('Detect server type', ['server' => $url]);
 212                 $serverdata = [];
 213
 214                 $original_url = $url;
 215
 216                 // Remove URL content that is not supposed to exist for a server url
 217                 $urlparts = parse_url($url);
 218                 unset($urlparts['user']);
 219                 unset($urlparts['pass']);
 220                 unset($urlparts['query']);
 221                 unset($urlparts['fragment']);
 222                 $url = Network::unparseURL($urlparts);
 223
 224                 // If the URL missmatches, then we mark the old entry as failure
 225                 if ($url != $original_url) {
 226                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($original_url)]);
 227                 }
 228
 229                 // When a nodeinfo is present, we don't need to dig further
 230                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 231                 $curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 232                 if ($curlResult->isTimeout()) {
 233                         self::setFailure($url);
 234                         return false;
 235                 }
 236
 237                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 238                 if ($only_nodeinfo && empty($nodeinfo)) {
 239                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 240                         self::setFailure($url);
 241                         return false;
 242                 }
 243
 244                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 245                 if (empty($nodeinfo)) {
 246                         $nodeinfo = self::fetchStatistics($url);
 247                 }
 248
 249                 // If that didn't work out well, we use some protocol specific endpoints
 250                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 251                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 252                         // Fetch the landing page, possibly it reveals some data
 253                         if (empty($nodeinfo['network'])) {
 254                                 $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 255                                 if ($curlResult->isSuccess()) {
 256                                         $serverdata = self::analyseRootHeader($curlResult, $serverdata);
 257                                         $serverdata = self::analyseRootBody($curlResult, $serverdata, $url);
 258                                 }
 259
 260                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 261                                         self::setFailure($url);
 262                                         return false;
 263                                 }
 264                         }
 265
 266                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 267                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 268                         }
 269
 270                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 271                         // With this check we don't have to waste time and ressources for dead systems.
 272                         // Also this hopefully prevents us from receiving abuse messages.
 273                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 274                                 self::setFailure($url);
 275                                 return false;
 276                         }
 277
 278                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 279                                 $serverdata = self::detectFriendica($url, $serverdata);
 280                         }
 281
 282                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 283                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 284                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 285                         }
 286
 287                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 288                         if (empty($serverdata['network'])) {
 289                                 $serverdata = self::detectHubzilla($url, $serverdata);
 290                         }
 291
 292                         if (empty($serverdata['network'])) {
 293                                 $serverdata = self::detectNextcloud($url, $serverdata);
 294                         }
 295
 296                         if (empty($serverdata['network'])) {
 297                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 298                         }
 299                 } else {
 300                         $serverdata = $nodeinfo;
 301                 }
 302
 303                 // Detect the directory type
 304                 $serverdata['directory-type'] = self::DT_NONE;
 305                 $serverdata = self::checkPoCo($url, $serverdata);
 306                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 307
 308                 // We can't detect the network type. Possibly it is some system that we don't know yet
 309                 if (empty($serverdata['network'])) {
 310                         $serverdata['network'] = Protocol::PHANTOM;
 311                 }
 312
 313                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 314                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 315                         $serverdata['network'] = $network;
 316                 }
 317
 318                 $serverdata['url'] = $url;
 319                 $serverdata['nurl'] = Strings::normaliseLink($url);
 320
 321                 // We take the highest number that we do find
 322                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 323
 324                 // On an active server there has to be at least a single user
 325                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 326                         $registeredUsers = 1;
 327                 }
 328
 329                 if ($serverdata['network'] != Protocol::PHANTOM) {
 330                         $gcontacts = DBA::count('gcontact', ['server_url' => [$url, $serverdata['nurl']]]);
 331                         $apcontacts = DBA::count('apcontact', ['baseurl' => [$url, $serverdata['nurl']]]);
 332                         $contacts = DBA::count('contact', ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 333                         $serverdata['registered-users'] = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 334                 } else {
 335                         $serverdata['registered-users'] = $registeredUsers;
 336                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 337                 }
 338
 339                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 340
 341                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 342                 if (!DBA::isResult($gserver)) {
 343                         $serverdata['created'] = DateTimeFormat::utcNow();
 344                         $ret = DBA::insert('gserver', $serverdata);
 345                 } else {
 346                         // Don't override the network with 'unknown' when there had been a valid entry before
 347                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 348                                 unset($serverdata['network']);
 349                         }
 350
 351                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 352                 }
 353
 354                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 355                         self::discoverRelay($url);
 356                 }
 357
 358                 return $ret;
 359         }
 360
 361         /**
 362          * Fetch relay data from a given server url
 363          *
 364          * @param string $server_url address of the server
 365          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 366          */
 367         private static function discoverRelay(string $server_url)
 368         {
 369                 Logger::info('Discover relay data', ['server' => $server_url]);
 370
 371                 $curlResult = Network::curl($server_url . '/.well-known/x-social-relay');
 372                 if (!$curlResult->isSuccess()) {
 373                         return;
 374                 }
 375
 376                 $data = json_decode($curlResult->getBody(), true);
 377                 if (!is_array($data)) {
 378                         return;
 379                 }
 380
 381                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 382                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 383
 384                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 385                         $data['scope'] = '';
 386                         $data['subscribe'] = false;
 387                         $data['tags'] = [];
 388                 }
 389
 390                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 391                 if (!DBA::isResult($gserver)) {
 392                         return;
 393                 }
 394
 395                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 396                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 397                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 398                 }
 399
 400                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 401
 402                 if ($data['scope'] == 'tags') {
 403                         // Avoid duplicates
 404                         $tags = [];
 405                         foreach ($data['tags'] as $tag) {
 406                                 $tag = mb_strtolower($tag);
 407                                 if (strlen($tag) < 100) {
 408                                         $tags[$tag] = $tag;
 409                                 }
 410                         }
 411
 412                         foreach ($tags as $tag) {
 413                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 414                         }
 415                 }
 416
 417                 // Create or update the relay contact
 418                 $fields = [];
 419                 if (isset($data['protocols'])) {
 420                         if (isset($data['protocols']['diaspora'])) {
 421                                 $fields['network'] = Protocol::DIASPORA;
 422
 423                                 if (isset($data['protocols']['diaspora']['receive'])) {
 424                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 425                                 } elseif (is_string($data['protocols']['diaspora'])) {
 426                                         $fields['batch'] = $data['protocols']['diaspora'];
 427                                 }
 428                         }
 429
 430                         if (isset($data['protocols']['dfrn'])) {
 431                                 $fields['network'] = Protocol::DFRN;
 432
 433                                 if (isset($data['protocols']['dfrn']['receive'])) {
 434                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 435                                 } elseif (is_string($data['protocols']['dfrn'])) {
 436                                         $fields['batch'] = $data['protocols']['dfrn'];
 437                                 }
 438                         }
 439                 }
 440                 Diaspora::setRelayContact($server_url, $fields);
 441         }
 442
 443         /**
 444          * Fetch server data from '/statistics.json' on the given server
 445          *
 446          * @param string $url URL of the given server
 447          *
 448          * @return array server data
 449          */
 450         private static function fetchStatistics(string $url)
 451         {
 452                 $curlResult = Network::curl($url . '/statistics.json');
 453                 if (!$curlResult->isSuccess()) {
 454                         return [];
 455                 }
 456
 457                 $data = json_decode($curlResult->getBody(), true);
 458                 if (empty($data)) {
 459                         return [];
 460                 }
 461
 462                 $serverdata = [];
 463
 464                 if (!empty($data['version'])) {
 465                         $serverdata['version'] = $data['version'];
 466                         // Version numbers on statistics.json are presented with additional info, e.g.:
 467                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 468                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 469                 }
 470
 471                 if (!empty($data['name'])) {
 472                         $serverdata['site_name'] = $data['name'];
 473                 }
 474
 475                 if (!empty($data['network'])) {
 476                         $serverdata['platform'] = strtolower($data['network']);
 477
 478                         if ($serverdata['platform'] == 'diaspora') {
 479                                 $serverdata['network'] = Protocol::DIASPORA;
 480                         } elseif ($serverdata['platform'] == 'friendica') {
 481                                 $serverdata['network'] = Protocol::DFRN;
 482                         } elseif ($serverdata['platform'] == 'hubzilla') {
 483                                 $serverdata['network'] = Protocol::ZOT;
 484                         } elseif ($serverdata['platform'] == 'redmatrix') {
 485                                 $serverdata['network'] = Protocol::ZOT;
 486                         }
 487                 }
 488
 489
 490                 if (!empty($data['registrations_open'])) {
 491                         $serverdata['register_policy'] = Register::OPEN;
 492                 } else {
 493                         $serverdata['register_policy'] = Register::CLOSED;
 494                 }
 495
 496                 return $serverdata;
 497         }
 498
 499         /**
 500          * Detect server type by using the nodeinfo data
 501          *
 502          * @param string     $url        address of the server
 503          * @param CurlResult $curlResult
 504          * @return array Server data
 505          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 506          */
 507         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 508         {
 509                 if (!$curlResult->isSuccess()) {
 510                         return [];
 511                 }
 512
 513                 $nodeinfo = json_decode($curlResult->getBody(), true);
 514
 515                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 516                         return [];
 517                 }
 518
 519                 $nodeinfo1_url = '';
 520                 $nodeinfo2_url = '';
 521
 522                 foreach ($nodeinfo['links'] as $link) {
 523                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 524                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 525                                 continue;
 526                         }
 527                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 528                                 $nodeinfo1_url = $link['href'];
 529                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 530                                 $nodeinfo2_url = $link['href'];
 531                         }
 532                 }
 533
 534                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 535                         return [];
 536                 }
 537
 538                 $server = [];
 539
 540                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 541                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 542                         $server = self::parseNodeinfo2($nodeinfo2_url);
 543                 }
 544
 545                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 546                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 547                         $server = self::parseNodeinfo1($nodeinfo1_url);
 548                 }
 549
 550                 return $server;
 551         }
 552
 553         /**
 554          * Parses Nodeinfo 1
 555          *
 556          * @param string $nodeinfo_url address of the nodeinfo path
 557          * @return array Server data
 558          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 559          */
 560         private static function parseNodeinfo1(string $nodeinfo_url)
 561         {
 562                 $curlResult = Network::curl($nodeinfo_url);
 563
 564                 if (!$curlResult->isSuccess()) {
 565                         return [];
 566                 }
 567
 568                 $nodeinfo = json_decode($curlResult->getBody(), true);
 569
 570                 if (!is_array($nodeinfo)) {
 571                         return [];
 572                 }
 573
 574                 $server = [];
 575
 576                 $server['register_policy'] = Register::CLOSED;
 577
 578                 if (!empty($nodeinfo['openRegistrations'])) {
 579                         $server['register_policy'] = Register::OPEN;
 580                 }
 581
 582                 if (is_array($nodeinfo['software'])) {
 583                         if (!empty($nodeinfo['software']['name'])) {
 584                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 585                         }
 586
 587                         if (!empty($nodeinfo['software']['version'])) {
 588                                 $server['version'] = $nodeinfo['software']['version'];
 589                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 590                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 591                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 592                         }
 593                 }
 594
 595                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 596                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 597                 }
 598
 599                 if (!empty($nodeinfo['usage']['users']['total'])) {
 600                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 601                 }
 602
 603                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 604                         $protocols = [];
 605                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 606                                 $protocols[$protocol] = true;
 607                         }
 608
 609                         if (!empty($protocols['friendica'])) {
 610                                 $server['network'] = Protocol::DFRN;
 611                         } elseif (!empty($protocols['activitypub'])) {
 612                                 $server['network'] = Protocol::ACTIVITYPUB;
 613                         } elseif (!empty($protocols['diaspora'])) {
 614                                 $server['network'] = Protocol::DIASPORA;
 615                         } elseif (!empty($protocols['ostatus'])) {
 616                                 $server['network'] = Protocol::OSTATUS;
 617                         } elseif (!empty($protocols['gnusocial'])) {
 618                                 $server['network'] = Protocol::OSTATUS;
 619                         } elseif (!empty($protocols['zot'])) {
 620                                 $server['network'] = Protocol::ZOT;
 621                         }
 622                 }
 623
 624                 if (empty($server)) {
 625                         return [];
 626                 }
 627
 628                 return $server;
 629         }
 630
 631         /**
 632          * Parses Nodeinfo 2
 633          *
 634          * @param string $nodeinfo_url address of the nodeinfo path
 635          * @return array Server data
 636          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 637          */
 638         private static function parseNodeinfo2(string $nodeinfo_url)
 639         {
 640                 $curlResult = Network::curl($nodeinfo_url);
 641                 if (!$curlResult->isSuccess()) {
 642                         return [];
 643                 }
 644
 645                 $nodeinfo = json_decode($curlResult->getBody(), true);
 646
 647                 if (!is_array($nodeinfo)) {
 648                         return [];
 649                 }
 650
 651                 $server = [];
 652
 653                 $server['register_policy'] = Register::CLOSED;
 654
 655                 if (!empty($nodeinfo['openRegistrations'])) {
 656                         $server['register_policy'] = Register::OPEN;
 657                 }
 658
 659                 if (is_array($nodeinfo['software'])) {
 660                         if (!empty($nodeinfo['software']['name'])) {
 661                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 662                         }
 663
 664                         if (!empty($nodeinfo['software']['version'])) {
 665                                 $server['version'] = $nodeinfo['software']['version'];
 666                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 667                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 668                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 669                         }
 670                 }
 671
 672                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 673                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 674                 }
 675
 676                 if (!empty($nodeinfo['usage']['users']['total'])) {
 677                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 678                 }
 679
 680                 if (!empty($nodeinfo['protocols'])) {
 681                         $protocols = [];
 682                         foreach ($nodeinfo['protocols'] as $protocol) {
 683                                 $protocols[$protocol] = true;
 684                         }
 685
 686                         if (!empty($protocols['dfrn'])) {
 687                                 $server['network'] = Protocol::DFRN;
 688                         } elseif (!empty($protocols['activitypub'])) {
 689                                 $server['network'] = Protocol::ACTIVITYPUB;
 690                         } elseif (!empty($protocols['diaspora'])) {
 691                                 $server['network'] = Protocol::DIASPORA;
 692                         } elseif (!empty($protocols['ostatus'])) {
 693                                 $server['network'] = Protocol::OSTATUS;
 694                         } elseif (!empty($protocols['gnusocial'])) {
 695                                 $server['network'] = Protocol::OSTATUS;
 696                         } elseif (!empty($protocols['zot'])) {
 697                                 $server['network'] = Protocol::ZOT;
 698                         }
 699                 }
 700
 701                 if (empty($server)) {
 702                         return [];
 703                 }
 704
 705                 return $server;
 706         }
 707
 708         /**
 709          * Fetch server information from a 'siteinfo.json' file on the given server
 710          *
 711          * @param string $url        URL of the given server
 712          * @param array  $serverdata array with server data
 713          *
 714          * @return array server data
 715          */
 716         private static function fetchSiteinfo(string $url, array $serverdata)
 717         {
 718                 $curlResult = Network::curl($url . '/siteinfo.json');
 719                 if (!$curlResult->isSuccess()) {
 720                         return $serverdata;
 721                 }
 722
 723                 $data = json_decode($curlResult->getBody(), true);
 724                 if (empty($data)) {
 725                         return $serverdata;
 726                 }
 727
 728                 if (!empty($data['url'])) {
 729                         $serverdata['platform'] = strtolower($data['platform']);
 730                         $serverdata['version'] = $data['version'];
 731                 }
 732
 733                 if (!empty($data['plugins'])) {
 734                         if (in_array('pubcrawl', $data['plugins'])) {
 735                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 736                         } elseif (in_array('diaspora', $data['plugins'])) {
 737                                 $serverdata['network'] = Protocol::DIASPORA;
 738                         } elseif (in_array('gnusoc', $data['plugins'])) {
 739                                 $serverdata['network'] = Protocol::OSTATUS;
 740                         } else {
 741                                 $serverdata['network'] = Protocol::ZOT;
 742                         }
 743                 }
 744
 745                 if (!empty($data['site_name'])) {
 746                         $serverdata['site_name'] = $data['site_name'];
 747                 }
 748
 749                 if (!empty($data['channels_total'])) {
 750                         $serverdata['registered-users'] = $data['channels_total'];
 751                 }
 752
 753                 if (!empty($data['register_policy'])) {
 754                         switch ($data['register_policy']) {
 755                                 case 'REGISTER_OPEN':
 756                                         $serverdata['register_policy'] = Register::OPEN;
 757                                         break;
 758
 759                                 case 'REGISTER_APPROVE':
 760                                         $serverdata['register_policy'] = Register::APPROVE;
 761                                         break;
 762
 763                                 case 'REGISTER_CLOSED':
 764                                 default:
 765                                         $serverdata['register_policy'] = Register::CLOSED;
 766                                         break;
 767                         }
 768                 }
 769
 770                 return $serverdata;
 771         }
 772
 773         /**
 774          * Checks if the server contains a valid host meta file
 775          *
 776          * @param string $url URL of the given server
 777          *
 778          * @return boolean 'true' if the server seems to be vital
 779          */
 780         private static function validHostMeta(string $url)
 781         {
 782                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 783                 $curlResult = Network::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 784                 if (!$curlResult->isSuccess()) {
 785                         return false;
 786                 }
 787
 788                 $xrd = XML::parseString($curlResult->getBody());
 789                 if (!is_object($xrd)) {
 790                         return false;
 791                 }
 792
 793                 $elements = XML::elementToArray($xrd);
 794                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 795                         return false;
 796                 }
 797
 798                 $valid = false;
 799                 foreach ($elements['xrd']['link'] as $link) {
 800                         // When there is more than a single "link" element, the array looks slightly different
 801                         if (!empty($link['@attributes'])) {
 802                                 $link = $link['@attributes'];
 803                         }
 804
 805                         if (empty($link['rel']) || empty($link['template'])) {
 806                                 continue;
 807                         }
 808
 809                         if ($link['rel'] == 'lrdd') {
 810                                 // When the webfinger host is the same like the system host, it should be ok.
 811                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 812                         }
 813                 }
 814
 815                 return $valid;
 816         }
 817
 818         /**
 819          * Detect the network of the given server via their known contacts
 820          *
 821          * @param string $url        URL of the given server
 822          * @param array  $serverdata array with server data
 823          *
 824          * @return array server data
 825          */
 826         private static function detectNetworkViaContacts(string $url, array $serverdata)
 827         {
 828                 $contacts = [];
 829
 830                 $gcontacts = DBA::select('gcontact', ['url', 'nurl'], ['server_url' => [$url, $serverdata['nurl']]]);
 831                 while ($gcontact = DBA::fetch($gcontacts)) {
 832                         $contacts[$gcontact['nurl']] = $gcontact['url'];
 833                 }
 834                 DBA::close($gcontacts);
 835
 836                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 837                 while ($apcontact = DBA::fetch($apcontacts)) {
 838                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 839                 }
 840                 DBA::close($apcontacts);
 841
 842                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 843                 while ($pcontact = DBA::fetch($pcontacts)) {
 844                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 845                 }
 846                 DBA::close($pcontacts);
 847
 848                 if (empty($contacts)) {
 849                         return $serverdata;
 850                 }
 851
 852                 foreach ($contacts as $contact) {
 853                         $probed = Probe::uri($contact);
 854                         if (in_array($probed['network'], Protocol::FEDERATED)) {
 855                                 $serverdata['network'] = $probed['network'];
 856                                 break;
 857                         }
 858                 }
 859
 860                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 861
 862                 return $serverdata;
 863         }
 864
 865         /**
 866          * Checks if the given server does have a '/poco' endpoint.
 867          * This is used for the 'PortableContact' functionality,
 868          * which is used by both Friendica and Hubzilla.
 869          *
 870          * @param string $url        URL of the given server
 871          * @param array  $serverdata array with server data
 872          *
 873          * @return array server data
 874          */
 875         private static function checkPoCo(string $url, array $serverdata)
 876         {
 877                 $serverdata['poco'] = '';
 878
 879                 $curlResult = Network::curl($url. '/poco');
 880                 if (!$curlResult->isSuccess()) {
 881                         return $serverdata;
 882                 }
 883
 884                 $data = json_decode($curlResult->getBody(), true);
 885                 if (empty($data)) {
 886                         return $serverdata;
 887                 }
 888
 889                 if (!empty($data['totalResults'])) {
 890                         $registeredUsers = $serverdata['registered-users'] ?? 0;
 891                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
 892                         $serverdata['directory-type'] = self::DT_POCO;
 893                         $serverdata['poco'] = $url . '/poco';
 894                 }
 895
 896                 return $serverdata;
 897         }
 898
 899         /**
 900          * Checks if the given server does have a Mastodon style directory endpoint.
 901          *
 902          * @param string $url        URL of the given server
 903          * @param array  $serverdata array with server data
 904          *
 905          * @return array server data
 906          */
 907         public static function checkMastodonDirectory(string $url, array $serverdata)
 908         {
 909                 $curlResult = Network::curl($url . '/api/v1/directory?limit=1');
 910                 if (!$curlResult->isSuccess()) {
 911                         return $serverdata;
 912                 }
 913
 914                 $data = json_decode($curlResult->getBody(), true);
 915                 if (empty($data)) {
 916                         return $serverdata;
 917                 }
 918
 919                 if (count($data) == 1) {
 920                         $serverdata['directory-type'] = self::DT_MASTODON;
 921                 }
 922
 923                 return $serverdata;
 924         }
 925
 926         /**
 927          * Detects the version number of a given server when it was a NextCloud installation
 928          *
 929          * @param string $url        URL of the given server
 930          * @param array  $serverdata array with server data
 931          *
 932          * @return array server data
 933          */
 934         private static function detectNextcloud(string $url, array $serverdata)
 935         {
 936                 $curlResult = Network::curl($url . '/status.php');
 937
 938                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 939                         return $serverdata;
 940                 }
 941
 942                 $data = json_decode($curlResult->getBody(), true);
 943                 if (empty($data)) {
 944                         return $serverdata;
 945                 }
 946
 947                 if (!empty($data['version'])) {
 948                         $serverdata['platform'] = 'nextcloud';
 949                         $serverdata['version'] = $data['version'];
 950                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 951                 }
 952
 953                 return $serverdata;
 954         }
 955
 956         /**
 957          * Detects data from a given server url if it was a mastodon alike system
 958          *
 959          * @param string $url        URL of the given server
 960          * @param array  $serverdata array with server data
 961          *
 962          * @return array server data
 963          */
 964         private static function detectMastodonAlikes(string $url, array $serverdata)
 965         {
 966                 $curlResult = Network::curl($url . '/api/v1/instance');
 967
 968                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 969                         return $serverdata;
 970                 }
 971
 972                 $data = json_decode($curlResult->getBody(), true);
 973                 if (empty($data)) {
 974                         return $serverdata;
 975                 }
 976
 977                 if (!empty($data['version'])) {
 978                         $serverdata['platform'] = 'mastodon';
 979                         $serverdata['version'] = $data['version'] ?? '';
 980                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 981                 }
 982
 983                 if (!empty($data['title'])) {
 984                         $serverdata['site_name'] = $data['title'];
 985                 }
 986
 987                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
 988                         $serverdata['platform'] = 'mastodon';
 989                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 990                 }
 991
 992                 if (!empty($data['description'])) {
 993                         $serverdata['info'] = trim($data['description']);
 994                 }
 995
 996                 if (!empty($data['stats']['user_count'])) {
 997                         $serverdata['registered-users'] = $data['stats']['user_count'];
 998                 }
 999
1000                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1001                         $serverdata['platform'] = strtolower($matches[1]);
1002                         $serverdata['version'] = $matches[2];
1003                 }
1004
1005                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1006                         $serverdata['platform'] = 'pleroma';
1007                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1008                 }
1009
1010                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1011                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1012                         $serverdata['platform'] = 'pleroma';
1013                 }
1014
1015                 return $serverdata;
1016         }
1017
1018         /**
1019          * Detects data from typical Hubzilla endpoints
1020          *
1021          * @param string $url        URL of the given server
1022          * @param array  $serverdata array with server data
1023          *
1024          * @return array server data
1025          */
1026         private static function detectHubzilla(string $url, array $serverdata)
1027         {
1028                 $curlResult = Network::curl($url . '/api/statusnet/config.json');
1029                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1030                         return $serverdata;
1031                 }
1032
1033                 $data = json_decode($curlResult->getBody(), true);
1034                 if (empty($data)) {
1035                         return $serverdata;
1036                 }
1037
1038                 if (!empty($data['site']['name'])) {
1039                         $serverdata['site_name'] = $data['site']['name'];
1040                 }
1041
1042                 if (!empty($data['site']['platform'])) {
1043                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1044                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1045                         $serverdata['network'] = Protocol::ZOT;
1046                 }
1047
1048                 if (!empty($data['site']['hubzilla'])) {
1049                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1050                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1051                         $serverdata['network'] = Protocol::ZOT;
1052                 }
1053
1054                 if (!empty($data['site']['redmatrix'])) {
1055                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1056                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1057                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1058                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1059                         }
1060
1061                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1062                         $serverdata['network'] = Protocol::ZOT;
1063                 }
1064
1065                 $private = false;
1066                 $inviteonly = false;
1067                 $closed = false;
1068
1069                 if (!empty($data['site']['closed'])) {
1070                         $closed = self::toBoolean($data['site']['closed']);
1071                 }
1072
1073                 if (!empty($data['site']['private'])) {
1074                         $private = self::toBoolean($data['site']['private']);
1075                 }
1076
1077                 if (!empty($data['site']['inviteonly'])) {
1078                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1079                 }
1080
1081                 if (!$closed && !$private and $inviteonly) {
1082                         $register_policy = Register::APPROVE;
1083                 } elseif (!$closed && !$private) {
1084                         $register_policy = Register::OPEN;
1085                 } else {
1086                         $register_policy = Register::CLOSED;
1087                 }
1088
1089                 return $serverdata;
1090         }
1091
1092         /**
1093          * Converts input value to a boolean value
1094          *
1095          * @param string|integer $val
1096          *
1097          * @return boolean
1098          */
1099         private static function toBoolean($val)
1100         {
1101                 if (($val == 'true') || ($val == 1)) {
1102                         return true;
1103                 } elseif (($val == 'false') || ($val == 0)) {
1104                         return false;
1105                 }
1106
1107                 return $val;
1108         }
1109
1110         /**
1111          * Detect if the URL belongs to a GNU Social server
1112          *
1113          * @param string $url        URL of the given server
1114          * @param array  $serverdata array with server data
1115          *
1116          * @return array server data
1117          */
1118         private static function detectGNUSocial(string $url, array $serverdata)
1119         {
1120                 // Test for GNU Social
1121                 $curlResult = Network::curl($url . '/api/gnusocial/version.json');
1122                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1123                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1124                         $serverdata['platform'] = 'gnusocial';
1125                         // Remove junk that some GNU Social servers return
1126                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1127                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1128                         $serverdata['version'] = trim($serverdata['version'], '"');
1129                         $serverdata['network'] = Protocol::OSTATUS;
1130                         return $serverdata;
1131                 }
1132
1133                 // Test for Statusnet
1134                 $curlResult = Network::curl($url . '/api/statusnet/version.json');
1135                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1136                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1137
1138                         // Remove junk that some GNU Social servers return
1139                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1140                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1141                         $serverdata['version'] = trim($serverdata['version'], '"');
1142
1143                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1144                                 $serverdata['platform'] = 'pleroma';
1145                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1146                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1147                         } else {
1148                                 $serverdata['platform'] = 'statusnet';
1149                                 $serverdata['network'] = Protocol::OSTATUS;
1150                         }
1151                 }
1152
1153                 return $serverdata;
1154         }
1155
1156         /**
1157          * Detect if the URL belongs to a Friendica server
1158          *
1159          * @param string $url        URL of the given server
1160          * @param array  $serverdata array with server data
1161          *
1162          * @return array server data
1163          */
1164         private static function detectFriendica(string $url, array $serverdata)
1165         {
1166                 $curlResult = Network::curl($url . '/friendica/json');
1167                 if (!$curlResult->isSuccess()) {
1168                         $curlResult = Network::curl($url . '/friendika/json');
1169                 }
1170
1171                 if (!$curlResult->isSuccess()) {
1172                         return $serverdata;
1173                 }
1174
1175                 $data = json_decode($curlResult->getBody(), true);
1176                 if (empty($data) || empty($data['version'])) {
1177                         return $serverdata;
1178                 }
1179
1180                 $serverdata['network'] = Protocol::DFRN;
1181                 $serverdata['version'] = $data['version'];
1182
1183                 if (!empty($data['no_scrape_url'])) {
1184                         $serverdata['noscrape'] = $data['no_scrape_url'];
1185                 }
1186
1187                 if (!empty($data['site_name'])) {
1188                         $serverdata['site_name'] = $data['site_name'];
1189                 }
1190
1191                 if (!empty($data['info'])) {
1192                         $serverdata['info'] = trim($data['info']);
1193                 }
1194
1195                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1196                 switch ($register_policy) {
1197                         case 'REGISTER_OPEN':
1198                                 $serverdata['register_policy'] = Register::OPEN;
1199                                 break;
1200
1201                         case 'REGISTER_APPROVE':
1202                                 $serverdata['register_policy'] = Register::APPROVE;
1203                                 break;
1204
1205                         case 'REGISTER_CLOSED':
1206                         case 'REGISTER_INVITATION':
1207                                 $serverdata['register_policy'] = Register::CLOSED;
1208                                 break;
1209                         default:
1210                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1211                                 $serverdata['register_policy'] = Register::CLOSED;
1212                                 break;
1213                 }
1214
1215                 $serverdata['platform'] = strtolower($data['platform'] ?? '');
1216
1217                 return $serverdata;
1218         }
1219
1220         /**
1221          * Analyses the landing page of a given server for hints about type and system of that server
1222          *
1223          * @param object $curlResult result of curl execution
1224          * @param array  $serverdata array with server data
1225          * @param string $url        Server URL
1226          *
1227          * @return array server data
1228          */
1229         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1230         {
1231                 $doc = new DOMDocument();
1232                 @$doc->loadHTML($curlResult->getBody());
1233                 $xpath = new DOMXPath($doc);
1234
1235                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1236                 if (!empty($title)) {
1237                         $serverdata['site_name'] = $title;
1238                 }
1239
1240                 $list = $xpath->query('//meta[@name]');
1241
1242                 foreach ($list as $node) {
1243                         $attr = [];
1244                         if ($node->attributes->length) {
1245                                 foreach ($node->attributes as $attribute) {
1246                                         $value = trim($attribute->value);
1247                                         if (empty($value)) {
1248                                                 continue;
1249                                         }
1250
1251                                         $attr[$attribute->name] = $value;
1252                                 }
1253
1254                                 if (empty($attr['name']) || empty($attr['content'])) {
1255                                         continue;
1256                                 }
1257                         }
1258
1259                         if ($attr['name'] == 'description') {
1260                                 $serverdata['info'] = $attr['content'];
1261                         }
1262
1263                         if ($attr['name'] == 'application-name') {
1264                                 $serverdata['platform'] = strtolower($attr['content']);
1265                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1266                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1267                                 }
1268                         }
1269                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1270                                 $serverdata['platform'] = strtolower($attr['content']);
1271                                 $version_part = explode(' ', $attr['content']);
1272
1273                                 if (count($version_part) == 2) {
1274                                         if (in_array($version_part[0], ['WordPress'])) {
1275                                                 $serverdata['platform'] = strtolower($version_part[0]);
1276                                                 $serverdata['version'] = $version_part[1];
1277
1278                                                 // We still do need a reliable test if some AP plugin is activated
1279                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1280                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1281                                                 } else {
1282                                                         $serverdata['network'] = Protocol::FEED;
1283                                                 }
1284                                         }
1285                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1286                                                 $serverdata['platform'] = strtolower($version_part[0]);
1287                                                 $serverdata['version'] = $version_part[1];
1288                                                 $serverdata['network'] = Protocol::DFRN;
1289                                         }
1290                                 }
1291                         }
1292                 }
1293
1294                 $list = $xpath->query('//meta[@property]');
1295
1296                 foreach ($list as $node) {
1297                         $attr = [];
1298                         if ($node->attributes->length) {
1299                                 foreach ($node->attributes as $attribute) {
1300                                         $value = trim($attribute->value);
1301                                         if (empty($value)) {
1302                                                 continue;
1303                                         }
1304
1305                                         $attr[$attribute->name] = $value;
1306                                 }
1307
1308                                 if (empty($attr['property']) || empty($attr['content'])) {
1309                                         continue;
1310                                 }
1311                         }
1312
1313                         if ($attr['property'] == 'og:site_name') {
1314                                 $serverdata['site_name'] = $attr['content'];
1315                         }
1316
1317                         if ($attr['property'] == 'og:description') {
1318                                 $serverdata['info'] = $attr['content'];
1319                         }
1320
1321                         if ($attr['property'] == 'og:platform') {
1322                                 $serverdata['platform'] = strtolower($attr['content']);
1323
1324                                 if (in_array($attr['content'], ['PeerTube'])) {
1325                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1326                                 }
1327                         }
1328
1329                         if ($attr['property'] == 'generator') {
1330                                 $serverdata['platform'] = strtolower($attr['content']);
1331
1332                                 if (in_array($attr['content'], ['hubzilla'])) {
1333                                         // We later check which compatible protocol modules are loaded.
1334                                         $serverdata['network'] = Protocol::ZOT;
1335                                 }
1336                         }
1337                 }
1338
1339                 return $serverdata;
1340         }
1341
1342         /**
1343          * Analyses the header data of a given server for hints about type and system of that server
1344          *
1345          * @param object $curlResult result of curl execution
1346          * @param array  $serverdata array with server data
1347          *
1348          * @return array server data
1349          */
1350         private static function analyseRootHeader($curlResult, array $serverdata)
1351         {
1352                 if ($curlResult->getHeader('server') == 'Mastodon') {
1353                         $serverdata['platform'] = 'mastodon';
1354                         $serverdata['network'] = $network = Protocol::ACTIVITYPUB;
1355                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1356                         $serverdata['platform'] = 'diaspora';
1357                         $serverdata['network'] = $network = Protocol::DIASPORA;
1358                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1359                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1360                         $serverdata['platform'] = 'friendica';
1361                         $serverdata['network'] = $network = Protocol::DFRN;
1362                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1363                 }
1364                 return $serverdata;
1365         }
1366
1367         /**
1368          * Test if the body contains valid content
1369          *
1370          * @param string $body
1371          * @return boolean
1372          */
1373         private static function invalidBody(string $body)
1374         {
1375                 // Currently we only test for a HTML element.
1376                 // Possibly we enhance this in the future.
1377                 return !strpos($body, '>');
1378         }
1379
1380         /**
1381          * Update the user directory of a given gserver record
1382          *
1383          * @param array $gserver gserver record
1384          */
1385         public static function updateDirectory(array $gserver)
1386         {
1387                 /// @todo Add Mastodon API directory
1388
1389                 if (!empty($gserver['poco'])) {
1390                         PortableContact::discoverSingleServer($gserver['id']);
1391                 }
1392         }
1393
1394         /**
1395          * Update GServer entries
1396          */
1397         public static function discover()
1398         {
1399                 // Update the server list
1400                 self::discoverFederation();
1401
1402                 $no_of_queries = 5;
1403
1404                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1405
1406                 if ($requery_days == 0) {
1407                         $requery_days = 7;
1408                 }
1409
1410                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1411
1412                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`
1413                         FROM `gserver`
1414                         WHERE `last_contact` >= `last_failure`
1415                         AND `poco` != ''
1416                         AND `last_poco_query` < ?
1417                         ORDER BY RAND()", $last_update
1418                 );
1419
1420                 while ($gserver = DBA::fetch($gservers)) {
1421                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1422                                 // The server is not reachable? Okay, then we will try it later
1423                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1424                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1425                                 continue;
1426                         }
1427
1428                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1429                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1430
1431                         if (--$no_of_queries == 0) {
1432                                 break;
1433                         }
1434                 }
1435
1436                 DBA::close($gservers);
1437         }
1438
1439         /**
1440          * Discover federated servers
1441          */
1442         private static function discoverFederation()
1443         {
1444                 $last = DI::config()->get('poco', 'last_federation_discovery');
1445
1446                 if ($last) {
1447                         $next = $last + (24 * 60 * 60);
1448
1449                         if ($next > time()) {
1450                                 return;
1451                         }
1452                 }
1453
1454                 // Discover federated servers
1455                 $curlResult = Network::fetchUrl("http://the-federation.info/pods.json");
1456
1457                 if (!empty($curlResult)) {
1458                         $servers = json_decode($curlResult, true);
1459
1460                         if (!empty($servers['pods'])) {
1461                                 foreach ($servers['pods'] as $server) {
1462                                         // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1463                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1464                                 }
1465                         }
1466                 }
1467
1468                 // Disvover Mastodon servers
1469                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1470
1471                 if (!empty($accesstoken)) {
1472                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1473                         $header = ['Authorization: Bearer '.$accesstoken];
1474                         $curlResult = Network::curl($api, false, ['headers' => $header]);
1475
1476                         if ($curlResult->isSuccess()) {
1477                                 $servers = json_decode($curlResult->getBody(), true);
1478
1479                                 foreach ($servers['instances'] as $server) {
1480                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1481                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1482                                 }
1483                         }
1484                 }
1485
1486                 DI::config()->set('poco', 'last_federation_discovery', time());
1487         }
1488 }