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\IHTTPResult;
  34 use Friendica\Protocol\Diaspora;
  35 use Friendica\Util\DateTimeFormat;
  36 use Friendica\Util\Network;
  37 use Friendica\Util\Strings;
  38 use Friendica\Util\XML;
  39
  40 /**
  41  * This class handles GServer related functions
  42  */
  43 class GServer
  44 {
  45         // Directory types
  46         const DT_NONE = 0;
  47         const DT_POCO = 1;
  48         const DT_MASTODON = 2;
  49
  50         // Methods to detect server types
  51
  52         // Non endpoint specific methods
  53         const DETECT_MANUAL = 0;
  54         const DETECT_HEADER = 1;
  55         const DETECT_BODY = 2;
  56
  57         // Implementation specific endpoints
  58         const DETECT_FRIENDIKA = 10;
  59         const DETECT_FRIENDICA = 11;
  60         const DETECT_STATUSNET = 12;
  61         const DETECT_GNUSOCIAL = 13;
  62         const DETECT_CONFIG_JSON = 14; // Statusnet, GNU Social, Older Hubzilla/Redmatrix
  63         const DETECT_SITEINFO_JSON = 15; // Newer Hubzilla
  64         const DETECT_MASTODON_API = 16;
  65         const DETECT_STATUS_PHP = 17; // Nextcloud
  66
  67         // Standardized endpoints
  68         const DETECT_STATISTICS_JSON = 100;
  69         const DETECT_NODEINFO_1 = 101;
  70         const DETECT_NODEINFO_2 = 102;
  71
  72         /**
  73          * Get the ID for the given server URL
  74          *
  75          * @param string $url
  76          * @param boolean $no_check Don't check if the server hadn't been found
  77          * @return int gserver id
  78          */
  79         public static function getID(string $url, bool $no_check = false)
  80         {
  81                 if (empty($url)) {
  82                         return null;
  83                 }
  84
  85                 $url = self::cleanURL($url);
  86
  87                 $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => Strings::normaliseLink($url)]);
  88                 if (DBA::isResult($gserver)) {
  89                         Logger::info('Got ID for URL', ['id' => $gserver['id'], 'url' => $url, 'callstack' => System::callstack(20)]);
  90                         return $gserver['id'];
  91                 }
  92
  93                 if ($no_check || !self::check($url)) {
  94                         return null;
  95                 }
  96
  97                 return self::getID($url, true);
  98         }
  99
 100         /**
 101          * Checks if the given server is reachable
 102          *
 103          * @param string  $profile URL of the given profile
 104          * @param string  $server  URL of the given server (If empty, taken from profile)
 105          * @param string  $network Network value that is used, when detection failed
 106          * @param boolean $force   Force an update.
 107          *
 108          * @return boolean 'true' if server seems vital
 109          */
 110         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
 111         {
 112                 if ($server == '') {
 113                         $contact = Contact::getByURL($profile, null, ['baseurl']);
 114                         if (!empty($contact['baseurl'])) {
 115                                 $server = $contact['baseurl'];
 116                         }
 117                 }
 118
 119                 if ($server == '') {
 120                         return true;
 121                 }
 122
 123                 return self::check($server, $network, $force);
 124         }
 125
 126         /**
 127          * Decides if a server needs to be updated, based upon several date fields
 128          *
 129          * @param date $created      Creation date of that server entry
 130          * @param date $updated      When had the server entry be updated
 131          * @param date $last_failure Last failure when contacting that server
 132          * @param date $last_contact Last time the server had been contacted
 133          *
 134          * @return boolean Does the server record needs an update?
 135          */
 136         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 137         {
 138                 $now = strtotime(DateTimeFormat::utcNow());
 139
 140                 if ($updated > $last_contact) {
 141                         $contact_time = strtotime($updated);
 142                 } else {
 143                         $contact_time = strtotime($last_contact);
 144                 }
 145
 146                 $failure_time = strtotime($last_failure);
 147                 $created_time = strtotime($created);
 148
 149                 // If there is no "created" time then use the current time
 150                 if ($created_time <= 0) {
 151                         $created_time = $now;
 152                 }
 153
 154                 // If the last contact was less than 24 hours then don't update
 155                 if (($now - $contact_time) < (60 * 60 * 24)) {
 156                         return false;
 157                 }
 158
 159                 // If the last failure was less than 24 hours then don't update
 160                 if (($now - $failure_time) < (60 * 60 * 24)) {
 161                         return false;
 162                 }
 163
 164                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 165                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 166                 //      return false;
 167
 168                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 169                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 170                         return false;
 171                 }
 172
 173                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 174                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 175                         return false;
 176                 }
 177
 178                 return true;
 179         }
 180
 181         /**
 182          * Checks the state of the given server.
 183          *
 184          * @param string  $server_url    URL of the given server
 185          * @param string  $network       Network value that is used, when detection failed
 186          * @param boolean $force         Force an update.
 187          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 188          *
 189          * @return boolean 'true' if server seems vital
 190          */
 191         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 192         {
 193                 $server_url = self::cleanURL($server_url);
 194
 195                 if ($server_url == '') {
 196                         return false;
 197                 }
 198
 199                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 200                 if (DBA::isResult($gserver)) {
 201                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 202                                 $fields = ['created' => DateTimeFormat::utcNow()];
 203                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 204                                 DBA::update('gserver', $fields, $condition);
 205                         }
 206
 207                         $last_contact = $gserver['last_contact'];
 208                         $last_failure = $gserver['last_failure'];
 209
 210                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 211                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 212                         if ($last_contact < DBA::NULL_DATETIME) {
 213                                 $last_contact = DBA::NULL_DATETIME;
 214                         }
 215
 216                         if ($last_failure < DBA::NULL_DATETIME) {
 217                                 $last_failure = DBA::NULL_DATETIME;
 218                         }
 219
 220                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 221                                 Logger::info('No update needed', ['server' => $server_url]);
 222                                 return ($last_contact >= $last_failure);
 223                         }
 224                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 225                 } else {
 226                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 227                 }
 228
 229                 return self::detect($server_url, $network, $only_nodeinfo);
 230         }
 231
 232         /**
 233          * Set failed server status
 234          *
 235          * @param string $url
 236          */
 237         private static function setFailure(string $url)
 238         {
 239                 if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 240                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow(), 'detection-method' => null],
 241                         ['nurl' => Strings::normaliseLink($url)]);
 242                         Logger::info('Set failed status for existing server', ['url' => $url]);
 243                         return;
 244                 }
 245                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 246                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 247                         'failed' => true, 'last_failure' => DateTimeFormat::utcNow()]);
 248                 Logger::info('Set failed status for new server', ['url' => $url]);
 249         }
 250
 251         /**
 252          * Remove unwanted content from the given URL
 253          *
 254          * @param string $url
 255          * @return string cleaned URL
 256          */
 257         public static function cleanURL(string $url)
 258         {
 259                 $url = trim($url, '/');
 260                 $url = str_replace('/index.php', '', $url);
 261
 262                 $urlparts = parse_url($url);
 263                 unset($urlparts['user']);
 264                 unset($urlparts['pass']);
 265                 unset($urlparts['query']);
 266                 unset($urlparts['fragment']);
 267                 return Network::unparseURL($urlparts);
 268         }
 269
 270         /**
 271          * Return the base URL
 272          *
 273          * @param string $url
 274          * @return string base URL
 275          */
 276         private static function getBaseURL(string $url)
 277         {
 278                 $urlparts = parse_url(self::cleanURL($url));
 279                 unset($urlparts['path']);
 280                 return Network::unparseURL($urlparts);
 281         }
 282
 283         /**
 284          * Detect server data (type, protocol, version number, ...)
 285          * The detected data is then updated or inserted in the gserver table.
 286          *
 287          * @param string  $url           URL of the given server
 288          * @param string  $network       Network value that is used, when detection failed
 289          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 290          *
 291          * @return boolean 'true' if server could be detected
 292          */
 293         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 294         {
 295                 Logger::info('Detect server type', ['server' => $url]);
 296                 $serverdata = ['detection-method' => self::DETECT_MANUAL];
 297
 298                 $original_url = $url;
 299
 300                 // Remove URL content that is not supposed to exist for a server url
 301                 $url = self::cleanURL($url);
 302
 303                 // Get base URL
 304                 $baseurl = self::getBaseURL($url);
 305
 306                 // If the URL missmatches, then we mark the old entry as failure
 307                 if ($url != $original_url) {
 308                         DBA::update('gserver', ['failed' => true, 'last_failure' => DateTimeFormat::utcNow()],
 309                                 ['nurl' => Strings::normaliseLink($original_url)]);
 310                 }
 311
 312                 // When a nodeinfo is present, we don't need to dig further
 313                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 314                 $curlResult = DI::httpRequest()->get($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 315                 if ($curlResult->isTimeout()) {
 316                         self::setFailure($url);
 317                         return false;
 318                 }
 319
 320                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 321                 if ($only_nodeinfo && empty($nodeinfo)) {
 322                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 323                         self::setFailure($url);
 324                         return false;
 325                 }
 326
 327                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 328                 if (empty($nodeinfo)) {
 329                         $nodeinfo = self::fetchStatistics($url);
 330                 }
 331
 332                 // If that didn't work out well, we use some protocol specific endpoints
 333                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 334                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 335                         if (!empty($nodeinfo['detection-method'])) {
 336                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 337                         }
 338
 339                         // Fetch the landing page, possibly it reveals some data
 340                         if (empty($nodeinfo['network'])) {
 341                                 if ($baseurl == $url) {
 342                                         $basedata = $serverdata;
 343                                 } else {
 344                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 345                                 }
 346
 347                                 $curlResult = DI::httpRequest()->get($baseurl, false, ['timeout' => $xrd_timeout]);
 348                                 if ($curlResult->isSuccess()) {
 349                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 350                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 351                                 }
 352
 353                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 354                                         self::setFailure($url);
 355                                         return false;
 356                                 }
 357
 358                                 if ($baseurl == $url) {
 359                                         $serverdata = $basedata;
 360                                 } else {
 361                                         // When the base path doesn't seem to contain a social network we try the complete path.
 362                                         // Most detectable system have to be installed in the root directory.
 363                                         // We checked the base to avoid false positives.
 364                                         $curlResult = DI::httpRequest()->get($url, false, ['timeout' => $xrd_timeout]);
 365                                         if ($curlResult->isSuccess()) {
 366                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 367                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 368
 369                                                 $comparebase = $basedata;
 370                                                 unset($comparebase['info']);
 371                                                 unset($comparebase['site_name']);
 372                                                 $compareurl = $urldata;
 373                                                 unset($compareurl['info']);
 374                                                 unset($compareurl['site_name']);
 375
 376                                                 // We assume that no one will install the identical system in the root and a subfolder
 377                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 378                                                         $serverdata = $urldata;
 379                                                 }
 380                                         }
 381                                 }
 382                         }
 383
 384                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 385                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 386                         }
 387
 388                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 389                         // With this check we don't have to waste time and ressources for dead systems.
 390                         // Also this hopefully prevents us from receiving abuse messages.
 391                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 392                                 self::setFailure($url);
 393                                 return false;
 394                         }
 395
 396                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 397                                 $serverdata = self::detectFriendica($url, $serverdata);
 398                         }
 399
 400                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 401                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 402                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 403                         }
 404
 405                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 406                         if (empty($serverdata['network'])) {
 407                                 $serverdata = self::detectHubzilla($url, $serverdata);
 408                         }
 409
 410                         if (empty($serverdata['network'])) {
 411                                 $serverdata = self::detectNextcloud($url, $serverdata);
 412                         }
 413
 414                         if (empty($serverdata['network'])) {
 415                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 416                         }
 417
 418                         $serverdata = array_merge($nodeinfo, $serverdata);
 419                 } else {
 420                         $serverdata = $nodeinfo;
 421                 }
 422
 423                 // Detect the directory type
 424                 $serverdata['directory-type'] = self::DT_NONE;
 425                 $serverdata = self::checkPoCo($url, $serverdata);
 426                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 427
 428                 // We can't detect the network type. Possibly it is some system that we don't know yet
 429                 if (empty($serverdata['network'])) {
 430                         $serverdata['network'] = Protocol::PHANTOM;
 431                 }
 432
 433                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 434                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 435                         $serverdata['network'] = $network;
 436                 }
 437
 438                 $serverdata['url'] = $url;
 439                 $serverdata['nurl'] = Strings::normaliseLink($url);
 440
 441                 // We take the highest number that we do find
 442                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 443
 444                 // On an active server there has to be at least a single user
 445                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 446                         $registeredUsers = 1;
 447                 }
 448
 449                 if ($serverdata['network'] == Protocol::PHANTOM) {
 450                         $serverdata['registered-users'] = $registeredUsers;
 451                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 452                 }
 453
 454                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 455                 $serverdata['failed'] = false;
 456
 457                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 458                 if (!DBA::isResult($gserver)) {
 459                         $serverdata['created'] = DateTimeFormat::utcNow();
 460                         $ret = DBA::insert('gserver', $serverdata);
 461                         $id = DBA::lastInsertId();
 462                 } else {
 463                         // Don't override the network with 'unknown' when there had been a valid entry before
 464                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 465                                 unset($serverdata['network']);
 466                         }
 467
 468                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 469                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 470                         if (DBA::isResult($gserver)) {
 471                                 $id = $gserver['id'];
 472                         }
 473                 }
 474
 475                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 476                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 477                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 478                         $max_users = max($apcontacts, $contacts, $registeredUsers);
 479                         if ($max_users > $registeredUsers) {
 480                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 481                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 482                         }
 483                 }
 484
 485                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 486                         self::discoverRelay($url);
 487                 }
 488
 489                 return $ret;
 490         }
 491
 492         /**
 493          * Fetch relay data from a given server url
 494          *
 495          * @param string $server_url address of the server
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          */
 498         private static function discoverRelay(string $server_url)
 499         {
 500                 Logger::info('Discover relay data', ['server' => $server_url]);
 501
 502                 $curlResult = DI::httpRequest()->get($server_url . '/.well-known/x-social-relay');
 503                 if (!$curlResult->isSuccess()) {
 504                         return;
 505                 }
 506
 507                 $data = json_decode($curlResult->getBody(), true);
 508                 if (!is_array($data)) {
 509                         return;
 510                 }
 511
 512                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 513                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 514
 515                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 516                         $data['scope'] = '';
 517                         $data['subscribe'] = false;
 518                         $data['tags'] = [];
 519                 }
 520
 521                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($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                 $curlResult = DI::httpRequest()->get($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 IHTTPResult $httpResult
 635          *
 636          * @return array Server data
 637          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 638          */
 639         private static function fetchNodeinfo(string $url, IHTTPResult $httpResult)
 640         {
 641                 if (!$httpResult->isSuccess()) {
 642                         return [];
 643                 }
 644
 645                 $nodeinfo = json_decode($httpResult->getBody(), true);
 646
 647                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 648                         return [];
 649                 }
 650
 651                 $nodeinfo1_url = '';
 652                 $nodeinfo2_url = '';
 653
 654                 foreach ($nodeinfo['links'] as $link) {
 655                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 656                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 657                                 continue;
 658                         }
 659                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 660                                 $nodeinfo1_url = $link['href'];
 661                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 662                                 $nodeinfo2_url = $link['href'];
 663                         }
 664                 }
 665
 666                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 667                         return [];
 668                 }
 669
 670                 $server = [];
 671
 672                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 673                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 674                         $server = self::parseNodeinfo2($nodeinfo2_url);
 675                 }
 676
 677                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 678                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 679                         $server = self::parseNodeinfo1($nodeinfo1_url);
 680                 }
 681
 682                 return $server;
 683         }
 684
 685         /**
 686          * Parses Nodeinfo 1
 687          *
 688          * @param string $nodeinfo_url address of the nodeinfo path
 689          * @return array Server data
 690          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 691          */
 692         private static function parseNodeinfo1(string $nodeinfo_url)
 693         {
 694                 $curlResult = DI::httpRequest()->get($nodeinfo_url);
 695
 696                 if (!$curlResult->isSuccess()) {
 697                         return [];
 698                 }
 699
 700                 $nodeinfo = json_decode($curlResult->getBody(), true);
 701
 702                 if (!is_array($nodeinfo)) {
 703                         return [];
 704                 }
 705
 706                 $server = ['detection-method' => self::DETECT_NODEINFO_1,
 707                         'register_policy' => Register::CLOSED];
 708
 709                 if (!empty($nodeinfo['openRegistrations'])) {
 710                         $server['register_policy'] = Register::OPEN;
 711                 }
 712
 713                 if (is_array($nodeinfo['software'])) {
 714                         if (!empty($nodeinfo['software']['name'])) {
 715                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 716                         }
 717
 718                         if (!empty($nodeinfo['software']['version'])) {
 719                                 $server['version'] = $nodeinfo['software']['version'];
 720                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 721                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 722                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 723                         }
 724                 }
 725
 726                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 727                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 728                 }
 729
 730                 if (!empty($nodeinfo['usage']['users']['total'])) {
 731                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 732                 }
 733
 734                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 735                         $protocols = [];
 736                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 737                                 $protocols[$protocol] = true;
 738                         }
 739
 740                         if (!empty($protocols['friendica'])) {
 741                                 $server['network'] = Protocol::DFRN;
 742                         } elseif (!empty($protocols['activitypub'])) {
 743                                 $server['network'] = Protocol::ACTIVITYPUB;
 744                         } elseif (!empty($protocols['diaspora'])) {
 745                                 $server['network'] = Protocol::DIASPORA;
 746                         } elseif (!empty($protocols['ostatus'])) {
 747                                 $server['network'] = Protocol::OSTATUS;
 748                         } elseif (!empty($protocols['gnusocial'])) {
 749                                 $server['network'] = Protocol::OSTATUS;
 750                         } elseif (!empty($protocols['zot'])) {
 751                                 $server['network'] = Protocol::ZOT;
 752                         }
 753                 }
 754
 755                 if (empty($server)) {
 756                         return [];
 757                 }
 758
 759                 return $server;
 760         }
 761
 762         /**
 763          * Parses Nodeinfo 2
 764          *
 765          * @param string $nodeinfo_url address of the nodeinfo path
 766          * @return array Server data
 767          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 768          */
 769         private static function parseNodeinfo2(string $nodeinfo_url)
 770         {
 771                 $curlResult = DI::httpRequest()->get($nodeinfo_url);
 772                 if (!$curlResult->isSuccess()) {
 773                         return [];
 774                 }
 775
 776                 $nodeinfo = json_decode($curlResult->getBody(), true);
 777
 778                 if (!is_array($nodeinfo)) {
 779                         return [];
 780                 }
 781
 782                 $server = ['detection-method' => self::DETECT_NODEINFO_2,
 783                         'register_policy' => Register::CLOSED];
 784
 785                 if (!empty($nodeinfo['openRegistrations'])) {
 786                         $server['register_policy'] = Register::OPEN;
 787                 }
 788
 789                 if (is_array($nodeinfo['software'])) {
 790                         if (!empty($nodeinfo['software']['name'])) {
 791                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 792                         }
 793
 794                         if (!empty($nodeinfo['software']['version'])) {
 795                                 $server['version'] = $nodeinfo['software']['version'];
 796                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 797                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 798                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 799                         }
 800                 }
 801
 802                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 803                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 804                 }
 805
 806                 if (!empty($nodeinfo['usage']['users']['total'])) {
 807                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 808                 }
 809
 810                 if (!empty($nodeinfo['protocols'])) {
 811                         $protocols = [];
 812                         foreach ($nodeinfo['protocols'] as $protocol) {
 813                                 $protocols[$protocol] = true;
 814                         }
 815
 816                         if (!empty($protocols['dfrn'])) {
 817                                 $server['network'] = Protocol::DFRN;
 818                         } elseif (!empty($protocols['activitypub'])) {
 819                                 $server['network'] = Protocol::ACTIVITYPUB;
 820                         } elseif (!empty($protocols['diaspora'])) {
 821                                 $server['network'] = Protocol::DIASPORA;
 822                         } elseif (!empty($protocols['ostatus'])) {
 823                                 $server['network'] = Protocol::OSTATUS;
 824                         } elseif (!empty($protocols['gnusocial'])) {
 825                                 $server['network'] = Protocol::OSTATUS;
 826                         } elseif (!empty($protocols['zot'])) {
 827                                 $server['network'] = Protocol::ZOT;
 828                         }
 829                 }
 830
 831                 if (empty($server)) {
 832                         return [];
 833                 }
 834
 835                 return $server;
 836         }
 837
 838         /**
 839          * Fetch server information from a 'siteinfo.json' file on the given server
 840          *
 841          * @param string $url        URL of the given server
 842          * @param array  $serverdata array with server data
 843          *
 844          * @return array server data
 845          */
 846         private static function fetchSiteinfo(string $url, array $serverdata)
 847         {
 848                 $curlResult = DI::httpRequest()->get($url . '/siteinfo.json');
 849                 if (!$curlResult->isSuccess()) {
 850                         return $serverdata;
 851                 }
 852
 853                 $data = json_decode($curlResult->getBody(), true);
 854                 if (empty($data)) {
 855                         return $serverdata;
 856                 }
 857
 858                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
 859                         $serverdata['detection-method'] = self::DETECT_SITEINFO_JSON;
 860                 }
 861
 862                 if (!empty($data['url'])) {
 863                         $serverdata['platform'] = strtolower($data['platform']);
 864                         $serverdata['version'] = $data['version'];
 865                 }
 866
 867                 if (!empty($data['plugins'])) {
 868                         if (in_array('pubcrawl', $data['plugins'])) {
 869                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 870                         } elseif (in_array('diaspora', $data['plugins'])) {
 871                                 $serverdata['network'] = Protocol::DIASPORA;
 872                         } elseif (in_array('gnusoc', $data['plugins'])) {
 873                                 $serverdata['network'] = Protocol::OSTATUS;
 874                         } else {
 875                                 $serverdata['network'] = Protocol::ZOT;
 876                         }
 877                 }
 878
 879                 if (!empty($data['site_name'])) {
 880                         $serverdata['site_name'] = $data['site_name'];
 881                 }
 882
 883                 if (!empty($data['channels_total'])) {
 884                         $serverdata['registered-users'] = $data['channels_total'];
 885                 }
 886
 887                 if (!empty($data['register_policy'])) {
 888                         switch ($data['register_policy']) {
 889                                 case 'REGISTER_OPEN':
 890                                         $serverdata['register_policy'] = Register::OPEN;
 891                                         break;
 892
 893                                 case 'REGISTER_APPROVE':
 894                                         $serverdata['register_policy'] = Register::APPROVE;
 895                                         break;
 896
 897                                 case 'REGISTER_CLOSED':
 898                                 default:
 899                                         $serverdata['register_policy'] = Register::CLOSED;
 900                                         break;
 901                         }
 902                 }
 903
 904                 return $serverdata;
 905         }
 906
 907         /**
 908          * Checks if the server contains a valid host meta file
 909          *
 910          * @param string $url URL of the given server
 911          *
 912          * @return boolean 'true' if the server seems to be vital
 913          */
 914         private static function validHostMeta(string $url)
 915         {
 916                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 917                 $curlResult = DI::httpRequest()->get($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 918                 if (!$curlResult->isSuccess()) {
 919                         return false;
 920                 }
 921
 922                 $xrd = XML::parseString($curlResult->getBody());
 923                 if (!is_object($xrd)) {
 924                         return false;
 925                 }
 926
 927                 $elements = XML::elementToArray($xrd);
 928                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 929                         return false;
 930                 }
 931
 932                 $valid = false;
 933                 foreach ($elements['xrd']['link'] as $link) {
 934                         // When there is more than a single "link" element, the array looks slightly different
 935                         if (!empty($link['@attributes'])) {
 936                                 $link = $link['@attributes'];
 937                         }
 938
 939                         if (empty($link['rel']) || empty($link['template'])) {
 940                                 continue;
 941                         }
 942
 943                         if ($link['rel'] == 'lrdd') {
 944                                 // When the webfinger host is the same like the system host, it should be ok.
 945                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 946                         }
 947                 }
 948
 949                 return $valid;
 950         }
 951
 952         /**
 953          * Detect the network of the given server via their known contacts
 954          *
 955          * @param string $url        URL of the given server
 956          * @param array  $serverdata array with server data
 957          *
 958          * @return array server data
 959          */
 960         private static function detectNetworkViaContacts(string $url, array $serverdata)
 961         {
 962                 $contacts = [];
 963
 964                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 965                 while ($apcontact = DBA::fetch($apcontacts)) {
 966                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 967                 }
 968                 DBA::close($apcontacts);
 969
 970                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 971                 while ($pcontact = DBA::fetch($pcontacts)) {
 972                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 973                 }
 974                 DBA::close($pcontacts);
 975
 976                 if (empty($contacts)) {
 977                         return $serverdata;
 978                 }
 979
 980                 foreach ($contacts as $contact) {
 981                         $probed = Contact::getByURL($contact);
 982                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
 983                                 $serverdata['network'] = $probed['network'];
 984                                 break;
 985                         }
 986                 }
 987
 988                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 989
 990                 return $serverdata;
 991         }
 992
 993         /**
 994          * Checks if the given server does have a '/poco' endpoint.
 995          * This is used for the 'PortableContact' functionality,
 996          * which is used by both Friendica and Hubzilla.
 997          *
 998          * @param string $url        URL of the given server
 999          * @param array  $serverdata array with server data
1000          *
1001          * @return array server data
1002          */
1003         private static function checkPoCo(string $url, array $serverdata)
1004         {
1005                 $serverdata['poco'] = '';
1006
1007                 $curlResult = DI::httpRequest()->get($url . '/poco');
1008                 if (!$curlResult->isSuccess()) {
1009                         return $serverdata;
1010                 }
1011
1012                 $data = json_decode($curlResult->getBody(), true);
1013                 if (empty($data)) {
1014                         return $serverdata;
1015                 }
1016
1017                 if (!empty($data['totalResults'])) {
1018                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1019                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
1020                         $serverdata['directory-type'] = self::DT_POCO;
1021                         $serverdata['poco'] = $url . '/poco';
1022                 }
1023
1024                 return $serverdata;
1025         }
1026
1027         /**
1028          * Checks if the given server does have a Mastodon style directory endpoint.
1029          *
1030          * @param string $url        URL of the given server
1031          * @param array  $serverdata array with server data
1032          *
1033          * @return array server data
1034          */
1035         public static function checkMastodonDirectory(string $url, array $serverdata)
1036         {
1037                 $curlResult = DI::httpRequest()->get($url . '/api/v1/directory?limit=1');
1038                 if (!$curlResult->isSuccess()) {
1039                         return $serverdata;
1040                 }
1041
1042                 $data = json_decode($curlResult->getBody(), true);
1043                 if (empty($data)) {
1044                         return $serverdata;
1045                 }
1046
1047                 if (count($data) == 1) {
1048                         $serverdata['directory-type'] = self::DT_MASTODON;
1049                 }
1050
1051                 return $serverdata;
1052         }
1053
1054         /**
1055          * Detects the version number of a given server when it was a NextCloud installation
1056          *
1057          * @param string $url        URL of the given server
1058          * @param array  $serverdata array with server data
1059          *
1060          * @return array server data
1061          */
1062         private static function detectNextcloud(string $url, array $serverdata)
1063         {
1064                 $curlResult = DI::httpRequest()->get($url . '/status.php');
1065
1066                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1067                         return $serverdata;
1068                 }
1069
1070                 $data = json_decode($curlResult->getBody(), true);
1071                 if (empty($data)) {
1072                         return $serverdata;
1073                 }
1074
1075                 if (!empty($data['version'])) {
1076                         $serverdata['platform'] = 'nextcloud';
1077                         $serverdata['version'] = $data['version'];
1078                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1079
1080                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1081                                 $serverdata['detection-method'] = self::DETECT_STATUS_PHP;
1082                         }
1083                 }
1084
1085                 return $serverdata;
1086         }
1087
1088         /**
1089          * Detects data from a given server url if it was a mastodon alike system
1090          *
1091          * @param string $url        URL of the given server
1092          * @param array  $serverdata array with server data
1093          *
1094          * @return array server data
1095          */
1096         private static function detectMastodonAlikes(string $url, array $serverdata)
1097         {
1098                 $curlResult = DI::httpRequest()->get($url . '/api/v1/instance');
1099
1100                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1101                         return $serverdata;
1102                 }
1103
1104                 $data = json_decode($curlResult->getBody(), true);
1105                 if (empty($data)) {
1106                         return $serverdata;
1107                 }
1108
1109                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1110                         $serverdata['detection-method'] = self::DETECT_MASTODON_API;
1111                 }
1112
1113                 if (!empty($data['version'])) {
1114                         $serverdata['platform'] = 'mastodon';
1115                         $serverdata['version'] = $data['version'] ?? '';
1116                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1117                 }
1118
1119                 if (!empty($data['title'])) {
1120                         $serverdata['site_name'] = $data['title'];
1121                 }
1122
1123                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
1124                         $serverdata['platform'] = 'mastodon';
1125                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1126                 }
1127
1128                 if (!empty($data['description'])) {
1129                         $serverdata['info'] = trim($data['description']);
1130                 }
1131
1132                 if (!empty($data['stats']['user_count'])) {
1133                         $serverdata['registered-users'] = $data['stats']['user_count'];
1134                 }
1135
1136                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1137                         $serverdata['platform'] = strtolower($matches[1]);
1138                         $serverdata['version'] = $matches[2];
1139                 }
1140
1141                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1142                         $serverdata['platform'] = 'pleroma';
1143                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1144                 }
1145
1146                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1147                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1148                         $serverdata['platform'] = 'pleroma';
1149                 }
1150
1151                 return $serverdata;
1152         }
1153
1154         /**
1155          * Detects data from typical Hubzilla endpoints
1156          *
1157          * @param string $url        URL of the given server
1158          * @param array  $serverdata array with server data
1159          *
1160          * @return array server data
1161          */
1162         private static function detectHubzilla(string $url, array $serverdata)
1163         {
1164                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/config.json');
1165                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1166                         return $serverdata;
1167                 }
1168
1169                 $data = json_decode($curlResult->getBody(), true);
1170                 if (empty($data) || empty($data['site'])) {
1171                         return $serverdata;
1172                 }
1173
1174                 if (!empty($data['site']['name'])) {
1175                         $serverdata['site_name'] = $data['site']['name'];
1176                 }
1177
1178                 if (!empty($data['site']['platform'])) {
1179                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1180                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1181                         $serverdata['network'] = Protocol::ZOT;
1182                 }
1183
1184                 if (!empty($data['site']['hubzilla'])) {
1185                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1186                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1187                         $serverdata['network'] = Protocol::ZOT;
1188                 }
1189
1190                 if (!empty($data['site']['redmatrix'])) {
1191                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1192                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1193                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1194                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1195                         }
1196
1197                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1198                         $serverdata['network'] = Protocol::ZOT;
1199                 }
1200
1201                 $private = false;
1202                 $inviteonly = false;
1203                 $closed = false;
1204
1205                 if (!empty($data['site']['closed'])) {
1206                         $closed = self::toBoolean($data['site']['closed']);
1207                 }
1208
1209                 if (!empty($data['site']['private'])) {
1210                         $private = self::toBoolean($data['site']['private']);
1211                 }
1212
1213                 if (!empty($data['site']['inviteonly'])) {
1214                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1215                 }
1216
1217                 if (!$closed && !$private and $inviteonly) {
1218                         $serverdata['register_policy'] = Register::APPROVE;
1219                 } elseif (!$closed && !$private) {
1220                         $serverdata['register_policy'] = Register::OPEN;
1221                 } else {
1222                         $serverdata['register_policy'] = Register::CLOSED;
1223                 }
1224
1225                 if (!empty($serverdata['network']) && in_array($serverdata['detection-method'],
1226                         [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1227                         $serverdata['detection-method'] = self::DETECT_CONFIG_JSON;
1228                 }
1229
1230                 return $serverdata;
1231         }
1232
1233         /**
1234          * Converts input value to a boolean value
1235          *
1236          * @param string|integer $val
1237          *
1238          * @return boolean
1239          */
1240         private static function toBoolean($val)
1241         {
1242                 if (($val == 'true') || ($val == 1)) {
1243                         return true;
1244                 } elseif (($val == 'false') || ($val == 0)) {
1245                         return false;
1246                 }
1247
1248                 return $val;
1249         }
1250
1251         /**
1252          * Detect if the URL belongs to a GNU Social server
1253          *
1254          * @param string $url        URL of the given server
1255          * @param array  $serverdata array with server data
1256          *
1257          * @return array server data
1258          */
1259         private static function detectGNUSocial(string $url, array $serverdata)
1260         {
1261                 // Test for GNU Social
1262                 $curlResult = DI::httpRequest()->get($url . '/api/gnusocial/version.json');
1263                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1264                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1265                         $serverdata['platform'] = 'gnusocial';
1266                         // Remove junk that some GNU Social servers return
1267                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1268                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1269                         $serverdata['version'] = trim($serverdata['version'], '"');
1270                         $serverdata['network'] = Protocol::OSTATUS;
1271
1272                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1273                                 $serverdata['detection-method'] = self::DETECT_GNUSOCIAL;
1274                         }
1275
1276                         return $serverdata;
1277                 }
1278
1279                 // Test for Statusnet
1280                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/version.json');
1281                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1282                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1283
1284                         // Remove junk that some GNU Social servers return
1285                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1286                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1287                         $serverdata['version'] = trim($serverdata['version'], '"');
1288
1289                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1290                                 $serverdata['platform'] = 'pleroma';
1291                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1292                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1293                         } else {
1294                                 $serverdata['platform'] = 'statusnet';
1295                                 $serverdata['network'] = Protocol::OSTATUS;
1296                         }
1297
1298                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1299                                 $serverdata['detection-method'] = self::DETECT_STATUSNET;
1300                         }
1301                 }
1302
1303                 return $serverdata;
1304         }
1305
1306         /**
1307          * Detect if the URL belongs to a Friendica server
1308          *
1309          * @param string $url        URL of the given server
1310          * @param array  $serverdata array with server data
1311          *
1312          * @return array server data
1313          */
1314         private static function detectFriendica(string $url, array $serverdata)
1315         {
1316                 $curlResult = DI::httpRequest()->get($url . '/friendica/json');
1317                 if (!$curlResult->isSuccess()) {
1318                         $curlResult = DI::httpRequest()->get($url . '/friendika/json');
1319                         $friendika = true;
1320                         $platform = 'Friendika';
1321                 } else {
1322                         $friendika = false;
1323                         $platform = 'Friendica';
1324                 }
1325
1326                 if (!$curlResult->isSuccess()) {
1327                         return $serverdata;
1328                 }
1329
1330                 $data = json_decode($curlResult->getBody(), true);
1331                 if (empty($data) || empty($data['version'])) {
1332                         return $serverdata;
1333                 }
1334
1335                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1336                         $serverdata['detection-method'] = $friendika ? self::DETECT_FRIENDIKA : self::DETECT_FRIENDICA;
1337                 }
1338
1339                 $serverdata['network'] = Protocol::DFRN;
1340                 $serverdata['version'] = $data['version'];
1341
1342                 if (!empty($data['no_scrape_url'])) {
1343                         $serverdata['noscrape'] = $data['no_scrape_url'];
1344                 }
1345
1346                 if (!empty($data['site_name'])) {
1347                         $serverdata['site_name'] = $data['site_name'];
1348                 }
1349
1350                 if (!empty($data['info'])) {
1351                         $serverdata['info'] = trim($data['info']);
1352                 }
1353
1354                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1355                 switch ($register_policy) {
1356                         case 'REGISTER_OPEN':
1357                                 $serverdata['register_policy'] = Register::OPEN;
1358                                 break;
1359
1360                         case 'REGISTER_APPROVE':
1361                                 $serverdata['register_policy'] = Register::APPROVE;
1362                                 break;
1363
1364                         case 'REGISTER_CLOSED':
1365                         case 'REGISTER_INVITATION':
1366                                 $serverdata['register_policy'] = Register::CLOSED;
1367                                 break;
1368                         default:
1369                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1370                                 $serverdata['register_policy'] = Register::CLOSED;
1371                                 break;
1372                 }
1373
1374                 $serverdata['platform'] = strtolower($data['platform'] ?? $platform);
1375
1376                 return $serverdata;
1377         }
1378
1379         /**
1380          * Analyses the landing page of a given server for hints about type and system of that server
1381          *
1382          * @param object $curlResult result of curl execution
1383          * @param array  $serverdata array with server data
1384          * @param string $url        Server URL
1385          *
1386          * @return array server data
1387          */
1388         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1389         {
1390                 $doc = new DOMDocument();
1391                 @$doc->loadHTML($curlResult->getBody());
1392                 $xpath = new DOMXPath($doc);
1393
1394                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1395                 if (!empty($title)) {
1396                         $serverdata['site_name'] = $title;
1397                 }
1398
1399                 $list = $xpath->query('//meta[@name]');
1400
1401                 foreach ($list as $node) {
1402                         $attr = [];
1403                         if ($node->attributes->length) {
1404                                 foreach ($node->attributes as $attribute) {
1405                                         $value = trim($attribute->value);
1406                                         if (empty($value)) {
1407                                                 continue;
1408                                         }
1409
1410                                         $attr[$attribute->name] = $value;
1411                                 }
1412
1413                                 if (empty($attr['name']) || empty($attr['content'])) {
1414                                         continue;
1415                                 }
1416                         }
1417
1418                         if ($attr['name'] == 'description') {
1419                                 $serverdata['info'] = $attr['content'];
1420                         }
1421
1422                         if (in_array($attr['name'], ['application-name', 'al:android:app_name', 'al:ios:app_name',
1423                                 'twitter:app:name:googleplay', 'twitter:app:name:iphone', 'twitter:app:name:ipad'])) {
1424                                 $serverdata['platform'] = strtolower($attr['content']);
1425                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1426                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1427                                 }
1428                         }
1429                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1430                                 $serverdata['platform'] = strtolower($attr['content']);
1431                                 $version_part = explode(' ', $attr['content']);
1432
1433                                 if (count($version_part) == 2) {
1434                                         if (in_array($version_part[0], ['WordPress'])) {
1435                                                 $serverdata['platform'] = strtolower($version_part[0]);
1436                                                 $serverdata['version'] = $version_part[1];
1437
1438                                                 // We still do need a reliable test if some AP plugin is activated
1439                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1440                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1441                                                 } else {
1442                                                         $serverdata['network'] = Protocol::FEED;
1443                                                 }
1444
1445                                                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1446                                                         $serverdata['detection-method'] = self::DETECT_BODY;
1447                                                 }
1448                                         }
1449                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1450                                                 $serverdata['platform'] = strtolower($version_part[0]);
1451                                                 $serverdata['version'] = $version_part[1];
1452                                                 $serverdata['network'] = Protocol::DFRN;
1453                                         }
1454                                 }
1455                         }
1456                 }
1457
1458                 $list = $xpath->query('//meta[@property]');
1459
1460                 foreach ($list as $node) {
1461                         $attr = [];
1462                         if ($node->attributes->length) {
1463                                 foreach ($node->attributes as $attribute) {
1464                                         $value = trim($attribute->value);
1465                                         if (empty($value)) {
1466                                                 continue;
1467                                         }
1468
1469                                         $attr[$attribute->name] = $value;
1470                                 }
1471
1472                                 if (empty($attr['property']) || empty($attr['content'])) {
1473                                         continue;
1474                                 }
1475                         }
1476
1477                         if ($attr['property'] == 'og:site_name') {
1478                                 $serverdata['site_name'] = $attr['content'];
1479                         }
1480
1481                         if ($attr['property'] == 'og:description') {
1482                                 $serverdata['info'] = $attr['content'];
1483                         }
1484
1485                         if ($attr['property'] == 'og:platform') {
1486                                 $serverdata['platform'] = strtolower($attr['content']);
1487
1488                                 if (in_array($attr['content'], ['PeerTube'])) {
1489                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1490                                 }
1491                         }
1492
1493                         if ($attr['property'] == 'generator') {
1494                                 $serverdata['platform'] = strtolower($attr['content']);
1495
1496                                 if (in_array($attr['content'], ['hubzilla'])) {
1497                                         // We later check which compatible protocol modules are loaded.
1498                                         $serverdata['network'] = Protocol::ZOT;
1499                                 }
1500                         }
1501                 }
1502
1503                 if (!empty($serverdata['network']) && ($serverdata['detection-method'] == self::DETECT_MANUAL)) {
1504                         $serverdata['detection-method'] = self::DETECT_BODY;
1505                 }
1506
1507                 return $serverdata;
1508         }
1509
1510         /**
1511          * Analyses the header data of a given server for hints about type and system of that server
1512          *
1513          * @param object $curlResult result of curl execution
1514          * @param array  $serverdata array with server data
1515          *
1516          * @return array server data
1517          */
1518         private static function analyseRootHeader($curlResult, array $serverdata)
1519         {
1520                 if ($curlResult->getHeader('server') == 'Mastodon') {
1521                         $serverdata['platform'] = 'mastodon';
1522                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1523                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1524                         $serverdata['platform'] = 'diaspora';
1525                         $serverdata['network'] = Protocol::DIASPORA;
1526                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1527                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1528                         $serverdata['platform'] = 'friendica';
1529                         $serverdata['network'] = Protocol::DFRN;
1530                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1531                 } else {
1532                         return $serverdata;
1533                 }
1534
1535                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1536                         $serverdata['detection-method'] = self::DETECT_HEADER;
1537                 }
1538
1539                 return $serverdata;
1540         }
1541
1542         /**
1543          * Test if the body contains valid content
1544          *
1545          * @param string $body
1546          * @return boolean
1547          */
1548         private static function invalidBody(string $body)
1549         {
1550                 // Currently we only test for a HTML element.
1551                 // Possibly we enhance this in the future.
1552                 return !strpos($body, '>');
1553         }
1554
1555         /**
1556          * Update GServer entries
1557          */
1558         public static function discover()
1559         {
1560                 // Update the server list
1561                 self::discoverFederation();
1562
1563                 $no_of_queries = 5;
1564
1565                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1566
1567                 if ($requery_days == 0) {
1568                         $requery_days = 7;
1569                 }
1570
1571                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1572
1573                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`, `directory-type`
1574                         FROM `gserver`
1575                         WHERE NOT `failed`
1576                         AND `directory-type` != ?
1577                         AND `last_poco_query` < ?
1578                         ORDER BY RAND()", self::DT_NONE, $last_update
1579                 );
1580
1581                 while ($gserver = DBA::fetch($gservers)) {
1582                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1583                                 // The server is not reachable? Okay, then we will try it later
1584                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1585                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1586                                 continue;
1587                         }
1588
1589                         Logger::info('Update peer list', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1590                         Worker::add(PRIORITY_LOW, 'UpdateServerPeers', $gserver['url']);
1591
1592                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1593                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1594
1595                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1596                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1597
1598                         if (--$no_of_queries == 0) {
1599                                 break;
1600                         }
1601                 }
1602
1603                 DBA::close($gservers);
1604         }
1605
1606         /**
1607          * Discover federated servers
1608          */
1609         private static function discoverFederation()
1610         {
1611                 $last = DI::config()->get('poco', 'last_federation_discovery');
1612
1613                 if ($last) {
1614                         $next = $last + (24 * 60 * 60);
1615
1616                         if ($next > time()) {
1617                                 return;
1618                         }
1619                 }
1620
1621                 // Discover federated servers
1622                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1623                 foreach ($protocols as $protocol) {
1624                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1625                         $curlResult = DI::httpRequest()->fetch('https://the-federation.info/graphql?query=' . urlencode($query));
1626                         if (!empty($curlResult)) {
1627                                 $data = json_decode($curlResult, true);
1628                                 if (!empty($data['data']['nodes'])) {
1629                                         foreach ($data['data']['nodes'] as $server) {
1630                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1631                                                 Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1632                                         }
1633                                 }
1634                         }
1635                 }
1636
1637                 // Disvover Mastodon servers
1638                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1639
1640                 if (!empty($accesstoken)) {
1641                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1642                         $header = ['Authorization: Bearer '.$accesstoken];
1643                         $curlResult = DI::httpRequest()->get($api, false, ['headers' => $header]);
1644
1645                         if ($curlResult->isSuccess()) {
1646                                 $servers = json_decode($curlResult->getBody(), true);
1647
1648                                 foreach ($servers['instances'] as $server) {
1649                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1650                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1651                                 }
1652                         }
1653                 }
1654
1655                 DI::config()->set('poco', 'last_federation_discovery', time());
1656         }
1657 }