src/Model/GServer.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Core\Logger;
  27 use Friendica\Core\Protocol;
  28 use Friendica\Core\System;
  29 use Friendica\Core\Worker;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Module\Register;
  33 use Friendica\Network\CurlResult;
  34 use Friendica\Network\HTTPRequest;
  35 use Friendica\Protocol\Diaspora;
  36 use Friendica\Protocol\PortableContact;
  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
  69         // Standardized endpoints
  70         const DETECT_STATISTICS_JSON = 100;
  71         const DETECT_NODEINFO_1 = 101;
  72         const DETECT_NODEINFO_2 = 102;
  73
  74         /**
  75          * Get the ID for the given server URL
  76          *
  77          * @param string $url
  78          * @param boolean $no_check Don't check if the server hadn't been found
  79          * @return int gserver id
  80          */
  81         public static function getID(string $url, bool $no_check = false)
  82         {
  83                 if (empty($url)) {
  84                         return null;
  85                 }
  86
  87                 $url = self::cleanURL($url);
  88
  89                 $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => Strings::normaliseLink($url)]);
  90                 if (DBA::isResult($gserver)) {
  91                         Logger::info('Got ID for URL', ['id' => $gserver['id'], 'url' => $url, 'callstack' => System::callstack(20)]);
  92                         return $gserver['id'];
  93                 }
  94
  95                 if ($no_check || !self::check($url)) {
  96                         return null;
  97                 }
  98
  99                 return self::getID($url, true);
 100         }
 101
 102         /**
 103          * Checks if the given server is reachable
 104          *
 105          * @param string  $profile URL of the given profile
 106          * @param string  $server  URL of the given server (If empty, taken from profile)
 107          * @param string  $network Network value that is used, when detection failed
 108          * @param boolean $force   Force an update.
 109          *
 110          * @return boolean 'true' if server seems vital
 111          */
 112         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
 113         {
 114                 if ($server == '') {
 115                         $server = GContact::getBasepath($profile);
 116                 }
 117
 118                 if ($server == '') {
 119                         return true;
 120                 }
 121
 122                 return self::check($server, $network, $force);
 123         }
 124
 125         /**
 126          * Decides if a server needs to be updated, based upon several date fields
 127          *
 128          * @param date $created      Creation date of that server entry
 129          * @param date $updated      When had the server entry be updated
 130          * @param date $last_failure Last failure when contacting that server
 131          * @param date $last_contact Last time the server had been contacted
 132          *
 133          * @return boolean Does the server record needs an update?
 134          */
 135         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 136         {
 137                 $now = strtotime(DateTimeFormat::utcNow());
 138
 139                 if ($updated > $last_contact) {
 140                         $contact_time = strtotime($updated);
 141                 } else {
 142                         $contact_time = strtotime($last_contact);
 143                 }
 144
 145                 $failure_time = strtotime($last_failure);
 146                 $created_time = strtotime($created);
 147
 148                 // If there is no "created" time then use the current time
 149                 if ($created_time <= 0) {
 150                         $created_time = $now;
 151                 }
 152
 153                 // If the last contact was less than 24 hours then don't update
 154                 if (($now - $contact_time) < (60 * 60 * 24)) {
 155                         return false;
 156                 }
 157
 158                 // If the last failure was less than 24 hours then don't update
 159                 if (($now - $failure_time) < (60 * 60 * 24)) {
 160                         return false;
 161                 }
 162
 163                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 164                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 165                 //      return false;
 166
 167                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 168                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 169                         return false;
 170                 }
 171
 172                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 173                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 174                         return false;
 175                 }
 176
 177                 return true;
 178         }
 179
 180         /**
 181          * Checks the state of the given server.
 182          *
 183          * @param string  $server_url    URL of the given server
 184          * @param string  $network       Network value that is used, when detection failed
 185          * @param boolean $force         Force an update.
 186          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 187          *
 188          * @return boolean 'true' if server seems vital
 189          */
 190         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 191         {
 192                 $server_url = self::cleanURL($server_url);
 193
 194                 if ($server_url == '') {
 195                         return false;
 196                 }
 197
 198                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 199                 if (DBA::isResult($gserver)) {
 200                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 201                                 $fields = ['created' => DateTimeFormat::utcNow()];
 202                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 203                                 DBA::update('gserver', $fields, $condition);
 204                         }
 205
 206                         $last_contact = $gserver['last_contact'];
 207                         $last_failure = $gserver['last_failure'];
 208
 209                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 210                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 211                         if ($last_contact < DBA::NULL_DATETIME) {
 212                                 $last_contact = DBA::NULL_DATETIME;
 213                         }
 214
 215                         if ($last_failure < DBA::NULL_DATETIME) {
 216                                 $last_failure = DBA::NULL_DATETIME;
 217                         }
 218
 219                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 220                                 Logger::info('No update needed', ['server' => $server_url]);
 221                                 return ($last_contact >= $last_failure);
 222                         }
 223                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 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         private static function setFailure(string $url)
 237         {
 238                 if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 239                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow(), 'detection-method' => null],
 240                         ['nurl' => Strings::normaliseLink($url)]);
 241                         Logger::info('Set failed status for existing server', ['url' => $url]);
 242                         return;
 243                 }
 244                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 245                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 246                         'failed' => true, 'last_failure' => DateTimeFormat::utcNow()]);
 247                 Logger::info('Set failed status for new server', ['url' => $url]);
 248         }
 249
 250         /**
 251          * Remove unwanted content from the given URL
 252          *
 253          * @param string $url
 254          * @return string cleaned URL
 255          */
 256         public static function cleanURL(string $url)
 257         {
 258                 $url = trim($url, '/');
 259                 $url = str_replace('/index.php', '', $url);
 260
 261                 $urlparts = parse_url($url);
 262                 unset($urlparts['user']);
 263                 unset($urlparts['pass']);
 264                 unset($urlparts['query']);
 265                 unset($urlparts['fragment']);
 266                 return Network::unparseURL($urlparts);
 267         }
 268
 269         /**
 270          * Return the base URL
 271          *
 272          * @param string $url
 273          * @return string base URL
 274          */
 275         private static function getBaseURL(string $url)
 276         {
 277                 $urlparts = parse_url(self::cleanURL($url));
 278                 unset($urlparts['path']);
 279                 return Network::unparseURL($urlparts);
 280         }
 281
 282         /**
 283          * Detect server data (type, protocol, version number, ...)
 284          * The detected data is then updated or inserted in the gserver table.
 285          *
 286          * @param string  $url           URL of the given server
 287          * @param string  $network       Network value that is used, when detection failed
 288          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 289          *
 290          * @return boolean 'true' if server could be detected
 291          */
 292         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 293         {
 294                 Logger::info('Detect server type', ['server' => $url]);
 295                 $serverdata = ['detection-method' => self::DETECT_MANUAL];
 296
 297                 $original_url = $url;
 298
 299                 // Remove URL content that is not supposed to exist for a server url
 300                 $url = self::cleanURL($url);
 301
 302                 // Get base URL
 303                 $baseurl = self::getBaseURL($url);
 304
 305                 // If the URL missmatches, then we mark the old entry as failure
 306                 if ($url != $original_url) {
 307                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow()],
 308                                 ['nurl' => Strings::normaliseLink($original_url)]);
 309                 }
 310
 311                 // When a nodeinfo is present, we don't need to dig further
 312                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 313                 $curlResult = HTTPRequest::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 314                 if ($curlResult->isTimeout()) {
 315                         self::setFailure($url);
 316                         return false;
 317                 }
 318
 319                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 320                 if ($only_nodeinfo && empty($nodeinfo)) {
 321                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 322                         self::setFailure($url);
 323                         return false;
 324                 }
 325
 326                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 327                 if (empty($nodeinfo)) {
 328                         $nodeinfo = self::fetchStatistics($url);
 329                 }
 330
 331                 // If that didn't work out well, we use some protocol specific endpoints
 332                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 333                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 334                         if (!empty($nodeinfo['detection-method'])) {
 335                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 336                         }
 337
 338                         // Fetch the landing page, possibly it reveals some data
 339                         if (empty($nodeinfo['network'])) {
 340                                 if ($baseurl == $url) {
 341                                         $basedata = $serverdata;
 342                                 } else {
 343                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 344                                 }
 345
 346                                 $curlResult = HTTPRequest::curl($baseurl, false, ['timeout' => $xrd_timeout]);
 347                                 if ($curlResult->isSuccess()) {
 348                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 349                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 350                                 }
 351
 352                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 353                                         self::setFailure($url);
 354                                         return false;
 355                                 }
 356
 357                                 if ($baseurl == $url) {
 358                                         $serverdata = $basedata;
 359                                 } else {
 360                                         // When the base path doesn't seem to contain a social network we try the complete path.
 361                                         // Most detectable system have to be installed in the root directory.
 362                                         // We checked the base to avoid false positives.
 363                                         $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 364                                         if ($curlResult->isSuccess()) {
 365                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 366                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 367
 368                                                 $comparebase = $basedata;
 369                                                 unset($comparebase['info']);
 370                                                 unset($comparebase['site_name']);
 371                                                 $compareurl = $urldata;
 372                                                 unset($compareurl['info']);
 373                                                 unset($compareurl['site_name']);
 374
 375                                                 // We assume that no one will install the identical system in the root and a subfolder
 376                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 377                                                         $serverdata = $urldata;
 378                                                 }
 379                                         }
 380                                 }
 381                         }
 382
 383                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 384                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 385                         }
 386
 387                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 388                         // With this check we don't have to waste time and ressources for dead systems.
 389                         // Also this hopefully prevents us from receiving abuse messages.
 390                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 391                                 self::setFailure($url);
 392                                 return false;
 393                         }
 394
 395                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 396                                 $serverdata = self::detectFriendica($url, $serverdata);
 397                         }
 398
 399                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 400                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 401                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 402                         }
 403
 404                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 405                         if (empty($serverdata['network'])) {
 406                                 $serverdata = self::detectHubzilla($url, $serverdata);
 407                         }
 408
 409                         if (empty($serverdata['network'])) {
 410                                 $serverdata = self::detectNextcloud($url, $serverdata);
 411                         }
 412
 413                         if (empty($serverdata['network'])) {
 414                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 415                         }
 416
 417                         $serverdata = array_merge($nodeinfo, $serverdata);
 418                 } else {
 419                         $serverdata = $nodeinfo;
 420                 }
 421
 422                 // Detect the directory type
 423                 $serverdata['directory-type'] = self::DT_NONE;
 424                 $serverdata = self::checkPoCo($url, $serverdata);
 425                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 426
 427                 // We can't detect the network type. Possibly it is some system that we don't know yet
 428                 if (empty($serverdata['network'])) {
 429                         $serverdata['network'] = Protocol::PHANTOM;
 430                 }
 431
 432                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 433                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 434                         $serverdata['network'] = $network;
 435                 }
 436
 437                 $serverdata['url'] = $url;
 438                 $serverdata['nurl'] = Strings::normaliseLink($url);
 439
 440                 // We take the highest number that we do find
 441                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 442
 443                 // On an active server there has to be at least a single user
 444                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 445                         $registeredUsers = 1;
 446                 }
 447
 448                 if ($serverdata['network'] == Protocol::PHANTOM) {
 449                         $serverdata['registered-users'] = $registeredUsers;
 450                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 451                 }
 452
 453                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 454                 $serverdata['failed'] = false;
 455
 456                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 457                 if (!DBA::isResult($gserver)) {
 458                         $serverdata['created'] = DateTimeFormat::utcNow();
 459                         $ret = DBA::insert('gserver', $serverdata);
 460                         $id = DBA::lastInsertId();
 461                 } else {
 462                         // Don't override the network with 'unknown' when there had been a valid entry before
 463                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 464                                 unset($serverdata['network']);
 465                         }
 466
 467                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 468                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 469                         if (DBA::isResult($gserver)) {
 470                                 $id = $gserver['id'];
 471                         }
 472                 }
 473
 474                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 475                         $gcontacts = DBA::count('gcontact', ['gsid' => $id]);
 476                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 477                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 478                         $max_users = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 479                         if ($max_users > $registeredUsers) {
 480                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 481                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 482                         }
 483                 }
 484
 485                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 486                         self::discoverRelay($url);
 487                 }
 488
 489                 return $ret;
 490         }
 491
 492         /**
 493          * Fetch relay data from a given server url
 494          *
 495          * @param string $server_url address of the server
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          */
 498         private static function discoverRelay(string $server_url)
 499         {
 500                 Logger::info('Discover relay data', ['server' => $server_url]);
 501
 502                 $curlResult = HTTPRequest::curl($server_url . '/.well-known/x-social-relay');
 503                 if (!$curlResult->isSuccess()) {
 504                         return;
 505                 }
 506
 507                 $data = json_decode($curlResult->getBody(), true);
 508                 if (!is_array($data)) {
 509                         return;
 510                 }
 511
 512                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 513                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 514
 515                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 516                         $data['scope'] = '';
 517                         $data['subscribe'] = false;
 518                         $data['tags'] = [];
 519                 }
 520
 521                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 522                 if (!DBA::isResult($gserver)) {
 523                         return;
 524                 }
 525
 526                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 527                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 528                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 529                 }
 530
 531                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 532
 533                 if ($data['scope'] == 'tags') {
 534                         // Avoid duplicates
 535                         $tags = [];
 536                         foreach ($data['tags'] as $tag) {
 537                                 $tag = mb_strtolower($tag);
 538                                 if (strlen($tag) < 100) {
 539                                         $tags[$tag] = $tag;
 540                                 }
 541                         }
 542
 543                         foreach ($tags as $tag) {
 544                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 545                         }
 546                 }
 547
 548                 // Create or update the relay contact
 549                 $fields = [];
 550                 if (isset($data['protocols'])) {
 551                         if (isset($data['protocols']['diaspora'])) {
 552                                 $fields['network'] = Protocol::DIASPORA;
 553
 554                                 if (isset($data['protocols']['diaspora']['receive'])) {
 555                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 556                                 } elseif (is_string($data['protocols']['diaspora'])) {
 557                                         $fields['batch'] = $data['protocols']['diaspora'];
 558                                 }
 559                         }
 560
 561                         if (isset($data['protocols']['dfrn'])) {
 562                                 $fields['network'] = Protocol::DFRN;
 563
 564                                 if (isset($data['protocols']['dfrn']['receive'])) {
 565                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 566                                 } elseif (is_string($data['protocols']['dfrn'])) {
 567                                         $fields['batch'] = $data['protocols']['dfrn'];
 568                                 }
 569                         }
 570                 }
 571                 Diaspora::setRelayContact($server_url, $fields);
 572         }
 573
 574         /**
 575          * Fetch server data from '/statistics.json' on the given server
 576          *
 577          * @param string $url URL of the given server
 578          *
 579          * @return array server data
 580          */
 581         private static function fetchStatistics(string $url)
 582         {
 583                 $curlResult = HTTPRequest::curl($url . '/statistics.json');
 584                 if (!$curlResult->isSuccess()) {
 585                         return [];
 586                 }
 587
 588                 $data = json_decode($curlResult->getBody(), true);
 589                 if (empty($data)) {
 590                         return [];
 591                 }
 592
 593                 $serverdata = ['detection-method' => self::DETECT_STATISTICS_JSON];
 594
 595                 if (!empty($data['version'])) {
 596                         $serverdata['version'] = $data['version'];
 597                         // Version numbers on statistics.json are presented with additional info, e.g.:
 598                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 599                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 600                 }
 601
 602                 if (!empty($data['name'])) {
 603                         $serverdata['site_name'] = $data['name'];
 604                 }
 605
 606                 if (!empty($data['network'])) {
 607                         $serverdata['platform'] = strtolower($data['network']);
 608
 609                         if ($serverdata['platform'] == 'diaspora') {
 610                                 $serverdata['network'] = Protocol::DIASPORA;
 611                         } elseif ($serverdata['platform'] == 'friendica') {
 612                                 $serverdata['network'] = Protocol::DFRN;
 613                         } elseif ($serverdata['platform'] == 'hubzilla') {
 614                                 $serverdata['network'] = Protocol::ZOT;
 615                         } elseif ($serverdata['platform'] == 'redmatrix') {
 616                                 $serverdata['network'] = Protocol::ZOT;
 617                         }
 618                 }
 619
 620
 621                 if (!empty($data['registrations_open'])) {
 622                         $serverdata['register_policy'] = Register::OPEN;
 623                 } else {
 624                         $serverdata['register_policy'] = Register::CLOSED;
 625                 }
 626
 627                 return $serverdata;
 628         }
 629
 630         /**
 631          * Detect server type by using the nodeinfo data
 632          *
 633          * @param string     $url        address of the server
 634          * @param CurlResult $curlResult
 635          * @return array Server data
 636          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 637          */
 638         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 639         {
 640                 if (!$curlResult->isSuccess()) {
 641                         return [];
 642                 }
 643
 644                 $nodeinfo = json_decode($curlResult->getBody(), true);
 645
 646                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 647                         return [];
 648                 }
 649
 650                 $nodeinfo1_url = '';
 651                 $nodeinfo2_url = '';
 652
 653                 foreach ($nodeinfo['links'] as $link) {
 654                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 655                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 656                                 continue;
 657                         }
 658                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 659                                 $nodeinfo1_url = $link['href'];
 660                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 661                                 $nodeinfo2_url = $link['href'];
 662                         }
 663                 }
 664
 665                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 666                         return [];
 667                 }
 668
 669                 $server = [];
 670
 671                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 672                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 673                         $server = self::parseNodeinfo2($nodeinfo2_url);
 674                 }
 675
 676                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 677                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 678                         $server = self::parseNodeinfo1($nodeinfo1_url);
 679                 }
 680
 681                 return $server;
 682         }
 683
 684         /**
 685          * Parses Nodeinfo 1
 686          *
 687          * @param string $nodeinfo_url address of the nodeinfo path
 688          * @return array Server data
 689          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 690          */
 691         private static function parseNodeinfo1(string $nodeinfo_url)
 692         {
 693                 $curlResult = HTTPRequest::curl($nodeinfo_url);
 694
 695                 if (!$curlResult->isSuccess()) {
 696                         return [];
 697                 }
 698
 699                 $nodeinfo = json_decode($curlResult->getBody(), true);
 700
 701                 if (!is_array($nodeinfo)) {
 702                         return [];
 703                 }
 704
 705                 $server = ['detection-method' => self::DETECT_NODEINFO_1,
 706                         'register_policy' => Register::CLOSED];
 707
 708                 if (!empty($nodeinfo['openRegistrations'])) {
 709                         $server['register_policy'] = Register::OPEN;
 710                 }
 711
 712                 if (is_array($nodeinfo['software'])) {
 713                         if (!empty($nodeinfo['software']['name'])) {
 714                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 715                         }
 716
 717                         if (!empty($nodeinfo['software']['version'])) {
 718                                 $server['version'] = $nodeinfo['software']['version'];
 719                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 720                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 721                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 722                         }
 723                 }
 724
 725                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 726                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 727                 }
 728
 729                 if (!empty($nodeinfo['usage']['users']['total'])) {
 730                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 731                 }
 732
 733                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 734                         $protocols = [];
 735                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 736                                 $protocols[$protocol] = true;
 737                         }
 738
 739                         if (!empty($protocols['friendica'])) {
 740                                 $server['network'] = Protocol::DFRN;
 741                         } elseif (!empty($protocols['activitypub'])) {
 742                                 $server['network'] = Protocol::ACTIVITYPUB;
 743                         } elseif (!empty($protocols['diaspora'])) {
 744                                 $server['network'] = Protocol::DIASPORA;
 745                         } elseif (!empty($protocols['ostatus'])) {
 746                                 $server['network'] = Protocol::OSTATUS;
 747                         } elseif (!empty($protocols['gnusocial'])) {
 748                                 $server['network'] = Protocol::OSTATUS;
 749                         } elseif (!empty($protocols['zot'])) {
 750                                 $server['network'] = Protocol::ZOT;
 751                         }
 752                 }
 753
 754                 if (empty($server)) {
 755                         return [];
 756                 }
 757
 758                 return $server;
 759         }
 760
 761         /**
 762          * Parses Nodeinfo 2
 763          *
 764          * @param string $nodeinfo_url address of the nodeinfo path
 765          * @return array Server data
 766          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 767          */
 768         private static function parseNodeinfo2(string $nodeinfo_url)
 769         {
 770                 $curlResult = HTTPRequest::curl($nodeinfo_url);
 771                 if (!$curlResult->isSuccess()) {
 772                         return [];
 773                 }
 774
 775                 $nodeinfo = json_decode($curlResult->getBody(), true);
 776
 777                 if (!is_array($nodeinfo)) {
 778                         return [];
 779                 }
 780
 781                 $server = ['detection-method' => self::DETECT_NODEINFO_2,
 782                         'register_policy' => Register::CLOSED];
 783
 784                 if (!empty($nodeinfo['openRegistrations'])) {
 785                         $server['register_policy'] = Register::OPEN;
 786                 }
 787
 788                 if (is_array($nodeinfo['software'])) {
 789                         if (!empty($nodeinfo['software']['name'])) {
 790                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 791                         }
 792
 793                         if (!empty($nodeinfo['software']['version'])) {
 794                                 $server['version'] = $nodeinfo['software']['version'];
 795                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 796                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 797                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 798                         }
 799                 }
 800
 801                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 802                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 803                 }
 804
 805                 if (!empty($nodeinfo['usage']['users']['total'])) {
 806                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 807                 }
 808
 809                 if (!empty($nodeinfo['protocols'])) {
 810                         $protocols = [];
 811                         foreach ($nodeinfo['protocols'] as $protocol) {
 812                                 $protocols[$protocol] = true;
 813                         }
 814
 815                         if (!empty($protocols['dfrn'])) {
 816                                 $server['network'] = Protocol::DFRN;
 817                         } elseif (!empty($protocols['activitypub'])) {
 818                                 $server['network'] = Protocol::ACTIVITYPUB;
 819                         } elseif (!empty($protocols['diaspora'])) {
 820                                 $server['network'] = Protocol::DIASPORA;
 821                         } elseif (!empty($protocols['ostatus'])) {
 822                                 $server['network'] = Protocol::OSTATUS;
 823                         } elseif (!empty($protocols['gnusocial'])) {
 824                                 $server['network'] = Protocol::OSTATUS;
 825                         } elseif (!empty($protocols['zot'])) {
 826                                 $server['network'] = Protocol::ZOT;
 827                         }
 828                 }
 829
 830                 if (empty($server)) {
 831                         return [];
 832                 }
 833
 834                 return $server;
 835         }
 836
 837         /**
 838          * Fetch server information from a 'siteinfo.json' file on the given server
 839          *
 840          * @param string $url        URL of the given server
 841          * @param array  $serverdata array with server data
 842          *
 843          * @return array server data
 844          */
 845         private static function fetchSiteinfo(string $url, array $serverdata)
 846         {
 847                 $curlResult = HTTPRequest::curl($url . '/siteinfo.json');
 848                 if (!$curlResult->isSuccess()) {
 849                         return $serverdata;
 850                 }
 851
 852                 $data = json_decode($curlResult->getBody(), true);
 853                 if (empty($data)) {
 854                         return $serverdata;
 855                 }
 856
 857                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
 858                         $serverdata['detection-method'] = self::DETECT_SITEINFO_JSON;
 859                 }
 860
 861                 if (!empty($data['url'])) {
 862                         $serverdata['platform'] = strtolower($data['platform']);
 863                         $serverdata['version'] = $data['version'];
 864                 }
 865
 866                 if (!empty($data['plugins'])) {
 867                         if (in_array('pubcrawl', $data['plugins'])) {
 868                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 869                         } elseif (in_array('diaspora', $data['plugins'])) {
 870                                 $serverdata['network'] = Protocol::DIASPORA;
 871                         } elseif (in_array('gnusoc', $data['plugins'])) {
 872                                 $serverdata['network'] = Protocol::OSTATUS;
 873                         } else {
 874                                 $serverdata['network'] = Protocol::ZOT;
 875                         }
 876                 }
 877
 878                 if (!empty($data['site_name'])) {
 879                         $serverdata['site_name'] = $data['site_name'];
 880                 }
 881
 882                 if (!empty($data['channels_total'])) {
 883                         $serverdata['registered-users'] = $data['channels_total'];
 884                 }
 885
 886                 if (!empty($data['register_policy'])) {
 887                         switch ($data['register_policy']) {
 888                                 case 'REGISTER_OPEN':
 889                                         $serverdata['register_policy'] = Register::OPEN;
 890                                         break;
 891
 892                                 case 'REGISTER_APPROVE':
 893                                         $serverdata['register_policy'] = Register::APPROVE;
 894                                         break;
 895
 896                                 case 'REGISTER_CLOSED':
 897                                 default:
 898                                         $serverdata['register_policy'] = Register::CLOSED;
 899                                         break;
 900                         }
 901                 }
 902
 903                 return $serverdata;
 904         }
 905
 906         /**
 907          * Checks if the server contains a valid host meta file
 908          *
 909          * @param string $url URL of the given server
 910          *
 911          * @return boolean 'true' if the server seems to be vital
 912          */
 913         private static function validHostMeta(string $url)
 914         {
 915                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 916                 $curlResult = HTTPRequest::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 917                 if (!$curlResult->isSuccess()) {
 918                         return false;
 919                 }
 920
 921                 $xrd = XML::parseString($curlResult->getBody());
 922                 if (!is_object($xrd)) {
 923                         return false;
 924                 }
 925
 926                 $elements = XML::elementToArray($xrd);
 927                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 928                         return false;
 929                 }
 930
 931                 $valid = false;
 932                 foreach ($elements['xrd']['link'] as $link) {
 933                         // When there is more than a single "link" element, the array looks slightly different
 934                         if (!empty($link['@attributes'])) {
 935                                 $link = $link['@attributes'];
 936                         }
 937
 938                         if (empty($link['rel']) || empty($link['template'])) {
 939                                 continue;
 940                         }
 941
 942                         if ($link['rel'] == 'lrdd') {
 943                                 // When the webfinger host is the same like the system host, it should be ok.
 944                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 945                         }
 946                 }
 947
 948                 return $valid;
 949         }
 950
 951         /**
 952          * Detect the network of the given server via their known contacts
 953          *
 954          * @param string $url        URL of the given server
 955          * @param array  $serverdata array with server data
 956          *
 957          * @return array server data
 958          */
 959         private static function detectNetworkViaContacts(string $url, array $serverdata)
 960         {
 961                 $contacts = [];
 962
 963                 $gcontacts = DBA::select('gcontact', ['url', 'nurl'], ['server_url' => [$url, $serverdata['nurl']]]);
 964                 while ($gcontact = DBA::fetch($gcontacts)) {
 965                         $contacts[$gcontact['nurl']] = $gcontact['url'];
 966                 }
 967                 DBA::close($gcontacts);
 968
 969                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 970                 while ($apcontact = DBA::fetch($apcontacts)) {
 971                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 972                 }
 973                 DBA::close($apcontacts);
 974
 975                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 976                 while ($pcontact = DBA::fetch($pcontacts)) {
 977                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 978                 }
 979                 DBA::close($pcontacts);
 980
 981                 if (empty($contacts)) {
 982                         return $serverdata;
 983                 }
 984
 985                 foreach ($contacts as $contact) {
 986                         $probed = Contact::getByURL($contact);
 987                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
 988                                 $serverdata['network'] = $probed['network'];
 989                                 break;
 990                         }
 991                 }
 992
 993                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 994
 995                 return $serverdata;
 996         }
 997
 998         /**
 999          * Checks if the given server does have a '/poco' endpoint.
1000          * This is used for the 'PortableContact' functionality,
1001          * which is used by both Friendica and Hubzilla.
1002          *
1003          * @param string $url        URL of the given server
1004          * @param array  $serverdata array with server data
1005          *
1006          * @return array server data
1007          */
1008         private static function checkPoCo(string $url, array $serverdata)
1009         {
1010                 $serverdata['poco'] = '';
1011
1012                 $curlResult = HTTPRequest::curl($url . '/poco');
1013                 if (!$curlResult->isSuccess()) {
1014                         return $serverdata;
1015                 }
1016
1017                 $data = json_decode($curlResult->getBody(), true);
1018                 if (empty($data)) {
1019                         return $serverdata;
1020                 }
1021
1022                 if (!empty($data['totalResults'])) {
1023                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1024                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
1025                         $serverdata['directory-type'] = self::DT_POCO;
1026                         $serverdata['poco'] = $url . '/poco';
1027                 }
1028
1029                 return $serverdata;
1030         }
1031
1032         /**
1033          * Checks if the given server does have a Mastodon style directory endpoint.
1034          *
1035          * @param string $url        URL of the given server
1036          * @param array  $serverdata array with server data
1037          *
1038          * @return array server data
1039          */
1040         public static function checkMastodonDirectory(string $url, array $serverdata)
1041         {
1042                 $curlResult = HTTPRequest::curl($url . '/api/v1/directory?limit=1');
1043                 if (!$curlResult->isSuccess()) {
1044                         return $serverdata;
1045                 }
1046
1047                 $data = json_decode($curlResult->getBody(), true);
1048                 if (empty($data)) {
1049                         return $serverdata;
1050                 }
1051
1052                 if (count($data) == 1) {
1053                         $serverdata['directory-type'] = self::DT_MASTODON;
1054                 }
1055
1056                 return $serverdata;
1057         }
1058
1059         /**
1060          * Detects the version number of a given server when it was a NextCloud installation
1061          *
1062          * @param string $url        URL of the given server
1063          * @param array  $serverdata array with server data
1064          *
1065          * @return array server data
1066          */
1067         private static function detectNextcloud(string $url, array $serverdata)
1068         {
1069                 $curlResult = HTTPRequest::curl($url . '/status.php');
1070
1071                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1072                         return $serverdata;
1073                 }
1074
1075                 $data = json_decode($curlResult->getBody(), true);
1076                 if (empty($data)) {
1077                         return $serverdata;
1078                 }
1079
1080                 if (!empty($data['version'])) {
1081                         $serverdata['platform'] = 'nextcloud';
1082                         $serverdata['version'] = $data['version'];
1083                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1084
1085                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1086                                 $serverdata['detection-method'] = self::DETECT_STATUS_PHP;
1087                         }
1088                 }
1089
1090                 return $serverdata;
1091         }
1092
1093         /**
1094          * Detects data from a given server url if it was a mastodon alike system
1095          *
1096          * @param string $url        URL of the given server
1097          * @param array  $serverdata array with server data
1098          *
1099          * @return array server data
1100          */
1101         private static function detectMastodonAlikes(string $url, array $serverdata)
1102         {
1103                 $curlResult = HTTPRequest::curl($url . '/api/v1/instance');
1104
1105                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1106                         return $serverdata;
1107                 }
1108
1109                 $data = json_decode($curlResult->getBody(), true);
1110                 if (empty($data)) {
1111                         return $serverdata;
1112                 }
1113
1114                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1115                         $serverdata['detection-method'] = self::DETECT_MASTODON_API;
1116                 }
1117
1118                 if (!empty($data['version'])) {
1119                         $serverdata['platform'] = 'mastodon';
1120                         $serverdata['version'] = $data['version'] ?? '';
1121                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1122                 }
1123
1124                 if (!empty($data['title'])) {
1125                         $serverdata['site_name'] = $data['title'];
1126                 }
1127
1128                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
1129                         $serverdata['platform'] = 'mastodon';
1130                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1131                 }
1132
1133                 if (!empty($data['description'])) {
1134                         $serverdata['info'] = trim($data['description']);
1135                 }
1136
1137                 if (!empty($data['stats']['user_count'])) {
1138                         $serverdata['registered-users'] = $data['stats']['user_count'];
1139                 }
1140
1141                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1142                         $serverdata['platform'] = strtolower($matches[1]);
1143                         $serverdata['version'] = $matches[2];
1144                 }
1145
1146                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1147                         $serverdata['platform'] = 'pleroma';
1148                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1149                 }
1150
1151                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1152                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1153                         $serverdata['platform'] = 'pleroma';
1154                 }
1155
1156                 return $serverdata;
1157         }
1158
1159         /**
1160          * Detects data from typical Hubzilla endpoints
1161          *
1162          * @param string $url        URL of the given server
1163          * @param array  $serverdata array with server data
1164          *
1165          * @return array server data
1166          */
1167         private static function detectHubzilla(string $url, array $serverdata)
1168         {
1169                 $curlResult = HTTPRequest::curl($url . '/api/statusnet/config.json');
1170                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1171                         return $serverdata;
1172                 }
1173
1174                 $data = json_decode($curlResult->getBody(), true);
1175                 if (empty($data) || empty($data['site'])) {
1176                         return $serverdata;
1177                 }
1178
1179                 if (!empty($data['site']['name'])) {
1180                         $serverdata['site_name'] = $data['site']['name'];
1181                 }
1182
1183                 if (!empty($data['site']['platform'])) {
1184                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1185                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1186                         $serverdata['network'] = Protocol::ZOT;
1187                 }
1188
1189                 if (!empty($data['site']['hubzilla'])) {
1190                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1191                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1192                         $serverdata['network'] = Protocol::ZOT;
1193                 }
1194
1195                 if (!empty($data['site']['redmatrix'])) {
1196                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1197                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1198                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1199                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1200                         }
1201
1202                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1203                         $serverdata['network'] = Protocol::ZOT;
1204                 }
1205
1206                 $private = false;
1207                 $inviteonly = false;
1208                 $closed = false;
1209
1210                 if (!empty($data['site']['closed'])) {
1211                         $closed = self::toBoolean($data['site']['closed']);
1212                 }
1213
1214                 if (!empty($data['site']['private'])) {
1215                         $private = self::toBoolean($data['site']['private']);
1216                 }
1217
1218                 if (!empty($data['site']['inviteonly'])) {
1219                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1220                 }
1221
1222                 if (!$closed && !$private and $inviteonly) {
1223                         $serverdata['register_policy'] = Register::APPROVE;
1224                 } elseif (!$closed && !$private) {
1225                         $serverdata['register_policy'] = Register::OPEN;
1226                 } else {
1227                         $serverdata['register_policy'] = Register::CLOSED;
1228                 }
1229
1230                 if (!empty($serverdata['network']) && in_array($serverdata['detection-method'],
1231                         [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1232                         $serverdata['detection-method'] = self::DETECT_CONFIG_JSON;
1233                 }
1234
1235                 return $serverdata;
1236         }
1237
1238         /**
1239          * Converts input value to a boolean value
1240          *
1241          * @param string|integer $val
1242          *
1243          * @return boolean
1244          */
1245         private static function toBoolean($val)
1246         {
1247                 if (($val == 'true') || ($val == 1)) {
1248                         return true;
1249                 } elseif (($val == 'false') || ($val == 0)) {
1250                         return false;
1251                 }
1252
1253                 return $val;
1254         }
1255
1256         /**
1257          * Detect if the URL belongs to a GNU Social server
1258          *
1259          * @param string $url        URL of the given server
1260          * @param array  $serverdata array with server data
1261          *
1262          * @return array server data
1263          */
1264         private static function detectGNUSocial(string $url, array $serverdata)
1265         {
1266                 // Test for GNU Social
1267                 $curlResult = HTTPRequest::curl($url . '/api/gnusocial/version.json');
1268                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1269                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1270                         $serverdata['platform'] = 'gnusocial';
1271                         // Remove junk that some GNU Social servers return
1272                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1273                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1274                         $serverdata['version'] = trim($serverdata['version'], '"');
1275                         $serverdata['network'] = Protocol::OSTATUS;
1276
1277                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1278                                 $serverdata['detection-method'] = self::DETECT_GNUSOCIAL;
1279                         }
1280
1281                         return $serverdata;
1282                 }
1283
1284                 // Test for Statusnet
1285                 $curlResult = HTTPRequest::curl($url . '/api/statusnet/version.json');
1286                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1287                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1288
1289                         // Remove junk that some GNU Social servers return
1290                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1291                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1292                         $serverdata['version'] = trim($serverdata['version'], '"');
1293
1294                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1295                                 $serverdata['platform'] = 'pleroma';
1296                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1297                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1298                         } else {
1299                                 $serverdata['platform'] = 'statusnet';
1300                                 $serverdata['network'] = Protocol::OSTATUS;
1301                         }
1302
1303                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1304                                 $serverdata['detection-method'] = self::DETECT_STATUSNET;
1305                         }
1306                 }
1307
1308                 return $serverdata;
1309         }
1310
1311         /**
1312          * Detect if the URL belongs to a Friendica server
1313          *
1314          * @param string $url        URL of the given server
1315          * @param array  $serverdata array with server data
1316          *
1317          * @return array server data
1318          */
1319         private static function detectFriendica(string $url, array $serverdata)
1320         {
1321                 $curlResult = HTTPRequest::curl($url . '/friendica/json');
1322                 if (!$curlResult->isSuccess()) {
1323                         $curlResult = HTTPRequest::curl($url . '/friendika/json');
1324                         $friendika = true;
1325                         $platform = 'Friendika';
1326                 } else {
1327                         $friendika = false;
1328                         $platform = 'Friendica';
1329                 }
1330
1331                 if (!$curlResult->isSuccess()) {
1332                         return $serverdata;
1333                 }
1334
1335                 $data = json_decode($curlResult->getBody(), true);
1336                 if (empty($data) || empty($data['version'])) {
1337                         return $serverdata;
1338                 }
1339
1340                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1341                         $serverdata['detection-method'] = $friendika ? self::DETECT_FRIENDIKA : self::DETECT_FRIENDICA;
1342                 }
1343
1344                 $serverdata['network'] = Protocol::DFRN;
1345                 $serverdata['version'] = $data['version'];
1346
1347                 if (!empty($data['no_scrape_url'])) {
1348                         $serverdata['noscrape'] = $data['no_scrape_url'];
1349                 }
1350
1351                 if (!empty($data['site_name'])) {
1352                         $serverdata['site_name'] = $data['site_name'];
1353                 }
1354
1355                 if (!empty($data['info'])) {
1356                         $serverdata['info'] = trim($data['info']);
1357                 }
1358
1359                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1360                 switch ($register_policy) {
1361                         case 'REGISTER_OPEN':
1362                                 $serverdata['register_policy'] = Register::OPEN;
1363                                 break;
1364
1365                         case 'REGISTER_APPROVE':
1366                                 $serverdata['register_policy'] = Register::APPROVE;
1367                                 break;
1368
1369                         case 'REGISTER_CLOSED':
1370                         case 'REGISTER_INVITATION':
1371                                 $serverdata['register_policy'] = Register::CLOSED;
1372                                 break;
1373                         default:
1374                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1375                                 $serverdata['register_policy'] = Register::CLOSED;
1376                                 break;
1377                 }
1378
1379                 $serverdata['platform'] = strtolower($data['platform'] ?? $platform);
1380
1381                 return $serverdata;
1382         }
1383
1384         /**
1385          * Analyses the landing page of a given server for hints about type and system of that server
1386          *
1387          * @param object $curlResult result of curl execution
1388          * @param array  $serverdata array with server data
1389          * @param string $url        Server URL
1390          *
1391          * @return array server data
1392          */
1393         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1394         {
1395                 $doc = new DOMDocument();
1396                 @$doc->loadHTML($curlResult->getBody());
1397                 $xpath = new DOMXPath($doc);
1398
1399                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1400                 if (!empty($title)) {
1401                         $serverdata['site_name'] = $title;
1402                 }
1403
1404                 $list = $xpath->query('//meta[@name]');
1405
1406                 foreach ($list as $node) {
1407                         $attr = [];
1408                         if ($node->attributes->length) {
1409                                 foreach ($node->attributes as $attribute) {
1410                                         $value = trim($attribute->value);
1411                                         if (empty($value)) {
1412                                                 continue;
1413                                         }
1414
1415                                         $attr[$attribute->name] = $value;
1416                                 }
1417
1418                                 if (empty($attr['name']) || empty($attr['content'])) {
1419                                         continue;
1420                                 }
1421                         }
1422
1423                         if ($attr['name'] == 'description') {
1424                                 $serverdata['info'] = $attr['content'];
1425                         }
1426
1427                         if (in_array($attr['name'], ['application-name', 'al:android:app_name', 'al:ios:app_name',
1428                                 'twitter:app:name:googleplay', 'twitter:app:name:iphone', 'twitter:app:name:ipad'])) {
1429                                 $serverdata['platform'] = strtolower($attr['content']);
1430                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1431                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1432                                 }
1433                         }
1434                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1435                                 $serverdata['platform'] = strtolower($attr['content']);
1436                                 $version_part = explode(' ', $attr['content']);
1437
1438                                 if (count($version_part) == 2) {
1439                                         if (in_array($version_part[0], ['WordPress'])) {
1440                                                 $serverdata['platform'] = strtolower($version_part[0]);
1441                                                 $serverdata['version'] = $version_part[1];
1442
1443                                                 // We still do need a reliable test if some AP plugin is activated
1444                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1445                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1446                                                 } else {
1447                                                         $serverdata['network'] = Protocol::FEED;
1448                                                 }
1449
1450                                                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1451                                                         $serverdata['detection-method'] = self::DETECT_BODY;
1452                                                 }
1453                                         }
1454                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1455                                                 $serverdata['platform'] = strtolower($version_part[0]);
1456                                                 $serverdata['version'] = $version_part[1];
1457                                                 $serverdata['network'] = Protocol::DFRN;
1458                                         }
1459                                 }
1460                         }
1461                 }
1462
1463                 $list = $xpath->query('//meta[@property]');
1464
1465                 foreach ($list as $node) {
1466                         $attr = [];
1467                         if ($node->attributes->length) {
1468                                 foreach ($node->attributes as $attribute) {
1469                                         $value = trim($attribute->value);
1470                                         if (empty($value)) {
1471                                                 continue;
1472                                         }
1473
1474                                         $attr[$attribute->name] = $value;
1475                                 }
1476
1477                                 if (empty($attr['property']) || empty($attr['content'])) {
1478                                         continue;
1479                                 }
1480                         }
1481
1482                         if ($attr['property'] == 'og:site_name') {
1483                                 $serverdata['site_name'] = $attr['content'];
1484                         }
1485
1486                         if ($attr['property'] == 'og:description') {
1487                                 $serverdata['info'] = $attr['content'];
1488                         }
1489
1490                         if ($attr['property'] == 'og:platform') {
1491                                 $serverdata['platform'] = strtolower($attr['content']);
1492
1493                                 if (in_array($attr['content'], ['PeerTube'])) {
1494                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1495                                 }
1496                         }
1497
1498                         if ($attr['property'] == 'generator') {
1499                                 $serverdata['platform'] = strtolower($attr['content']);
1500
1501                                 if (in_array($attr['content'], ['hubzilla'])) {
1502                                         // We later check which compatible protocol modules are loaded.
1503                                         $serverdata['network'] = Protocol::ZOT;
1504                                 }
1505                         }
1506                 }
1507
1508                 if (!empty($serverdata['network']) && ($serverdata['detection-method'] == self::DETECT_MANUAL)) {
1509                         $serverdata['detection-method'] = self::DETECT_BODY;
1510                 }
1511
1512                 return $serverdata;
1513         }
1514
1515         /**
1516          * Analyses the header data of a given server for hints about type and system of that server
1517          *
1518          * @param object $curlResult result of curl execution
1519          * @param array  $serverdata array with server data
1520          *
1521          * @return array server data
1522          */
1523         private static function analyseRootHeader($curlResult, array $serverdata)
1524         {
1525                 if ($curlResult->getHeader('server') == 'Mastodon') {
1526                         $serverdata['platform'] = 'mastodon';
1527                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1528                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1529                         $serverdata['platform'] = 'diaspora';
1530                         $serverdata['network'] = Protocol::DIASPORA;
1531                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1532                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1533                         $serverdata['platform'] = 'friendica';
1534                         $serverdata['network'] = Protocol::DFRN;
1535                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1536                 } else {
1537                         return $serverdata;
1538                 }
1539
1540                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1541                         $serverdata['detection-method'] = self::DETECT_HEADER;
1542                 }
1543
1544                 return $serverdata;
1545         }
1546
1547         /**
1548          * Test if the body contains valid content
1549          *
1550          * @param string $body
1551          * @return boolean
1552          */
1553         private static function invalidBody(string $body)
1554         {
1555                 // Currently we only test for a HTML element.
1556                 // Possibly we enhance this in the future.
1557                 return !strpos($body, '>');
1558         }
1559
1560         /**
1561          * Update the user directory of a given gserver record
1562          *
1563          * @param array $gserver gserver record
1564          */
1565         public static function updateDirectory(array $gserver)
1566         {
1567                 /// @todo Add Mastodon API directory
1568
1569                 if (!empty($gserver['poco'])) {
1570                         PortableContact::discoverSingleServer($gserver['id']);
1571                 }
1572         }
1573
1574         /**
1575          * Update GServer entries
1576          */
1577         public static function discover()
1578         {
1579                 // Update the server list
1580                 self::discoverFederation();
1581
1582                 $no_of_queries = 5;
1583
1584                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1585
1586                 if ($requery_days == 0) {
1587                         $requery_days = 7;
1588                 }
1589
1590                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1591
1592                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`
1593                         FROM `gserver`
1594                         WHERE NOT `failed`
1595                         AND `poco` != ''
1596                         AND `last_poco_query` < ?
1597                         ORDER BY RAND()", $last_update
1598                 );
1599
1600                 while ($gserver = DBA::fetch($gservers)) {
1601                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1602                                 // The server is not reachable? Okay, then we will try it later
1603                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1604                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1605                                 continue;
1606                         }
1607
1608                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1609                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1610
1611                         if (--$no_of_queries == 0) {
1612                                 break;
1613                         }
1614                 }
1615
1616                 DBA::close($gservers);
1617         }
1618
1619         /**
1620          * Discover federated servers
1621          */
1622         private static function discoverFederation()
1623         {
1624                 $last = DI::config()->get('poco', 'last_federation_discovery');
1625
1626                 if ($last) {
1627                         $next = $last + (24 * 60 * 60);
1628
1629                         if ($next > time()) {
1630                                 return;
1631                         }
1632                 }
1633
1634                 // Discover federated servers
1635                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1636                 foreach ($protocols as $protocol) {
1637                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1638                         $curlResult = HTTPRequest::fetchUrl('https://the-federation.info/graphql?query=' . urlencode($query));
1639                         if (!empty($curlResult)) {
1640                                 $data = json_decode($curlResult, true);
1641                                 if (!empty($data['data']['nodes'])) {
1642                                         foreach ($data['data']['nodes'] as $server) {
1643                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1644                                                 Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1645                                         }
1646                                 }
1647                         }
1648                 }
1649
1650                 // Disvover Mastodon servers
1651                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1652
1653                 if (!empty($accesstoken)) {
1654                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1655                         $header = ['Authorization: Bearer '.$accesstoken];
1656                         $curlResult = HTTPRequest::curl($api, false, ['headers' => $header]);
1657
1658                         if ($curlResult->isSuccess()) {
1659                                 $servers = json_decode($curlResult->getBody(), true);
1660
1661                                 foreach ($servers['instances'] as $server) {
1662                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1663                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1664                                 }
1665                         }
1666                 }
1667
1668                 DI::config()->set('poco', 'last_federation_discovery', time());
1669         }
1670 }