src/Model/GServer.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Core\Logger;
  27 use Friendica\Core\Protocol;
  28 use Friendica\Core\System;
  29 use Friendica\Core\Worker;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Module\Register;
  33 use Friendica\Network\CurlResult;
  34 use Friendica\Protocol\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', ['timeout' => $xrd_timeout]);
 315                 if ($curlResult->isTimeout()) {
 316                         self::setFailure($url);
 317                         return false;
 318                 }
 319
 320                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 321                 if ($only_nodeinfo && empty($nodeinfo)) {
 322                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 323                         self::setFailure($url);
 324                         return false;
 325                 }
 326
 327                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 328                 if (empty($nodeinfo)) {
 329                         $nodeinfo = self::fetchStatistics($url);
 330                 }
 331
 332                 // If that didn't work out well, we use some protocol specific endpoints
 333                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 334                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 335                         if (!empty($nodeinfo['detection-method'])) {
 336                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 337                         }
 338
 339                         // Fetch the landing page, possibly it reveals some data
 340                         if (empty($nodeinfo['network'])) {
 341                                 if ($baseurl == $url) {
 342                                         $basedata = $serverdata;
 343                                 } else {
 344                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 345                                 }
 346
 347                                 $curlResult = DI::httpRequest()->get($baseurl, ['timeout' => $xrd_timeout]);
 348                                 if ($curlResult->isSuccess()) {
 349                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 350                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 351                                 }
 352
 353                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 354                                         self::setFailure($url);
 355                                         return false;
 356                                 }
 357
 358                                 if ($baseurl == $url) {
 359                                         $serverdata = $basedata;
 360                                 } else {
 361                                         // When the base path doesn't seem to contain a social network we try the complete path.
 362                                         // Most detectable system have to be installed in the root directory.
 363                                         // We checked the base to avoid false positives.
 364                                         $curlResult = DI::httpRequest()->get($url, ['timeout' => $xrd_timeout]);
 365                                         if ($curlResult->isSuccess()) {
 366                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 367                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 368
 369                                                 $comparebase = $basedata;
 370                                                 unset($comparebase['info']);
 371                                                 unset($comparebase['site_name']);
 372                                                 $compareurl = $urldata;
 373                                                 unset($compareurl['info']);
 374                                                 unset($compareurl['site_name']);
 375
 376                                                 // We assume that no one will install the identical system in the root and a subfolder
 377                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 378                                                         $serverdata = $urldata;
 379                                                 }
 380                                         }
 381                                 }
 382                         }
 383
 384                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 385                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 386                         }
 387
 388                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 389                         // With this check we don't have to waste time and ressources for dead systems.
 390                         // Also this hopefully prevents us from receiving abuse messages.
 391                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 392                                 self::setFailure($url);
 393                                 return false;
 394                         }
 395
 396                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 397                                 $serverdata = self::detectFriendica($url, $serverdata);
 398                         }
 399
 400                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 401                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 402                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 403                         }
 404
 405                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 406                         if (empty($serverdata['network'])) {
 407                                 $serverdata = self::detectHubzilla($url, $serverdata);
 408                         }
 409
 410                         if (empty($serverdata['network'])) {
 411                                 $serverdata = self::detectNextcloud($url, $serverdata);
 412                         }
 413
 414                         if (empty($serverdata['network'])) {
 415                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 416                         }
 417
 418                         $serverdata = array_merge($nodeinfo, $serverdata);
 419                 } else {
 420                         $serverdata = $nodeinfo;
 421                 }
 422
 423                 // Detect the directory type
 424                 $serverdata['directory-type'] = self::DT_NONE;
 425                 $serverdata = self::checkPoCo($url, $serverdata);
 426                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 427
 428                 // We can't detect the network type. Possibly it is some system that we don't know yet
 429                 if (empty($serverdata['network'])) {
 430                         $serverdata['network'] = Protocol::PHANTOM;
 431                 }
 432
 433                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 434                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 435                         $serverdata['network'] = $network;
 436                 }
 437
 438                 $serverdata['url'] = $url;
 439                 $serverdata['nurl'] = Strings::normaliseLink($url);
 440
 441                 // We take the highest number that we do find
 442                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 443
 444                 // On an active server there has to be at least a single user
 445                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 446                         $registeredUsers = 1;
 447                 }
 448
 449                 if ($serverdata['network'] == Protocol::PHANTOM) {
 450                         $serverdata['registered-users'] = $registeredUsers;
 451                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 452                 }
 453
 454                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 455                 $serverdata['failed'] = false;
 456
 457                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 458                 if (!DBA::isResult($gserver)) {
 459                         $serverdata['created'] = DateTimeFormat::utcNow();
 460                         $ret = DBA::insert('gserver', $serverdata);
 461                         $id = DBA::lastInsertId();
 462                 } else {
 463                         // Don't override the network with 'unknown' when there had been a valid entry before
 464                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 465                                 unset($serverdata['network']);
 466                         }
 467
 468                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 469                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 470                         if (DBA::isResult($gserver)) {
 471                                 $id = $gserver['id'];
 472                         }
 473                 }
 474
 475                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 476                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 477                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 478                         $max_users = max($apcontacts, $contacts, $registeredUsers);
 479                         if ($max_users > $registeredUsers) {
 480                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 481                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 482                         }
 483                 }
 484
 485                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 486                         self::discoverRelay($url);
 487                 }
 488
 489                 return $ret;
 490         }
 491
 492         /**
 493          * Fetch relay data from a given server url
 494          *
 495          * @param string $server_url address of the server
 496          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 497          */
 498         private static function discoverRelay(string $server_url)
 499         {
 500                 Logger::info('Discover relay data', ['server' => $server_url]);
 501
 502                 $curlResult = DI::httpRequest()->get($server_url . '/.well-known/x-social-relay');
 503                 if (!$curlResult->isSuccess()) {
 504                         return;
 505                 }
 506
 507                 $data = json_decode($curlResult->getBody(), true);
 508                 if (!is_array($data)) {
 509                         return;
 510                 }
 511
 512                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 513                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 514
 515                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 516                         $data['scope'] = '';
 517                         $data['subscribe'] = false;
 518                         $data['tags'] = [];
 519                 }
 520
 521                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($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 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                 $curlResult = DI::httpRequest()->get($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                 $curlResult = DI::httpRequest()->get($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                 $curlResult = DI::httpRequest()->get($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                 $curlResult = DI::httpRequest()->get($url . '/.well-known/host-meta', ['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                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 964                 while ($apcontact = DBA::fetch($apcontacts)) {
 965                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 966                 }
 967                 DBA::close($apcontacts);
 968
 969                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 970                 while ($pcontact = DBA::fetch($pcontacts)) {
 971                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 972                 }
 973                 DBA::close($pcontacts);
 974
 975                 if (empty($contacts)) {
 976                         return $serverdata;
 977                 }
 978
 979                 foreach ($contacts as $contact) {
 980                         $probed = Contact::getByURL($contact);
 981                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
 982                                 $serverdata['network'] = $probed['network'];
 983                                 break;
 984                         }
 985                 }
 986
 987                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 988
 989                 return $serverdata;
 990         }
 991
 992         /**
 993          * Checks if the given server does have a '/poco' endpoint.
 994          * This is used for the 'PortableContact' functionality,
 995          * which is used by both Friendica and Hubzilla.
 996          *
 997          * @param string $url        URL of the given server
 998          * @param array  $serverdata array with server data
 999          *
1000          * @return array server data
1001          */
1002         private static function checkPoCo(string $url, array $serverdata)
1003         {
1004                 $serverdata['poco'] = '';
1005
1006                 $curlResult = DI::httpRequest()->get($url . '/poco');
1007                 if (!$curlResult->isSuccess()) {
1008                         return $serverdata;
1009                 }
1010
1011                 $data = json_decode($curlResult->getBody(), true);
1012                 if (empty($data)) {
1013                         return $serverdata;
1014                 }
1015
1016                 if (!empty($data['totalResults'])) {
1017                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1018                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
1019                         $serverdata['directory-type'] = self::DT_POCO;
1020                         $serverdata['poco'] = $url . '/poco';
1021                 }
1022
1023                 return $serverdata;
1024         }
1025
1026         /**
1027          * Checks if the given server does have a Mastodon style directory endpoint.
1028          *
1029          * @param string $url        URL of the given server
1030          * @param array  $serverdata array with server data
1031          *
1032          * @return array server data
1033          */
1034         public static function checkMastodonDirectory(string $url, array $serverdata)
1035         {
1036                 $curlResult = DI::httpRequest()->get($url . '/api/v1/directory?limit=1');
1037                 if (!$curlResult->isSuccess()) {
1038                         return $serverdata;
1039                 }
1040
1041                 $data = json_decode($curlResult->getBody(), true);
1042                 if (empty($data)) {
1043                         return $serverdata;
1044                 }
1045
1046                 if (count($data) == 1) {
1047                         $serverdata['directory-type'] = self::DT_MASTODON;
1048                 }
1049
1050                 return $serverdata;
1051         }
1052
1053         /**
1054          * Detects the version number of a given server when it was a NextCloud installation
1055          *
1056          * @param string $url        URL of the given server
1057          * @param array  $serverdata array with server data
1058          *
1059          * @return array server data
1060          */
1061         private static function detectNextcloud(string $url, array $serverdata)
1062         {
1063                 $curlResult = DI::httpRequest()->get($url . '/status.php');
1064
1065                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1066                         return $serverdata;
1067                 }
1068
1069                 $data = json_decode($curlResult->getBody(), true);
1070                 if (empty($data)) {
1071                         return $serverdata;
1072                 }
1073
1074                 if (!empty($data['version'])) {
1075                         $serverdata['platform'] = 'nextcloud';
1076                         $serverdata['version'] = $data['version'];
1077                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1078
1079                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1080                                 $serverdata['detection-method'] = self::DETECT_STATUS_PHP;
1081                         }
1082                 }
1083
1084                 return $serverdata;
1085         }
1086
1087         /**
1088          * Detects data from a given server url if it was a mastodon alike system
1089          *
1090          * @param string $url        URL of the given server
1091          * @param array  $serverdata array with server data
1092          *
1093          * @return array server data
1094          */
1095         private static function detectMastodonAlikes(string $url, array $serverdata)
1096         {
1097                 $curlResult = DI::httpRequest()->get($url . '/api/v1/instance');
1098
1099                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1100                         return $serverdata;
1101                 }
1102
1103                 $data = json_decode($curlResult->getBody(), true);
1104                 if (empty($data)) {
1105                         return $serverdata;
1106                 }
1107
1108                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1109                         $serverdata['detection-method'] = self::DETECT_MASTODON_API;
1110                 }
1111
1112                 if (!empty($data['version'])) {
1113                         $serverdata['platform'] = 'mastodon';
1114                         $serverdata['version'] = $data['version'] ?? '';
1115                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1116                 }
1117
1118                 if (!empty($data['title'])) {
1119                         $serverdata['site_name'] = $data['title'];
1120                 }
1121
1122                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
1123                         $serverdata['platform'] = 'mastodon';
1124                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1125                 }
1126
1127                 if (!empty($data['description'])) {
1128                         $serverdata['info'] = trim($data['description']);
1129                 }
1130
1131                 if (!empty($data['stats']['user_count'])) {
1132                         $serverdata['registered-users'] = $data['stats']['user_count'];
1133                 }
1134
1135                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
1136                         $serverdata['platform'] = strtolower($matches[1]);
1137                         $serverdata['version'] = $matches[2];
1138                 }
1139
1140                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
1141                         $serverdata['platform'] = 'pleroma';
1142                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1143                 }
1144
1145                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
1146                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
1147                         $serverdata['platform'] = 'pleroma';
1148                 }
1149
1150                 return $serverdata;
1151         }
1152
1153         /**
1154          * Detects data from typical Hubzilla endpoints
1155          *
1156          * @param string $url        URL of the given server
1157          * @param array  $serverdata array with server data
1158          *
1159          * @return array server data
1160          */
1161         private static function detectHubzilla(string $url, array $serverdata)
1162         {
1163                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/config.json');
1164                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
1165                         return $serverdata;
1166                 }
1167
1168                 $data = json_decode($curlResult->getBody(), true);
1169                 if (empty($data) || empty($data['site'])) {
1170                         return $serverdata;
1171                 }
1172
1173                 if (!empty($data['site']['name'])) {
1174                         $serverdata['site_name'] = $data['site']['name'];
1175                 }
1176
1177                 if (!empty($data['site']['platform'])) {
1178                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1179                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1180                         $serverdata['network'] = Protocol::ZOT;
1181                 }
1182
1183                 if (!empty($data['site']['hubzilla'])) {
1184                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1185                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1186                         $serverdata['network'] = Protocol::ZOT;
1187                 }
1188
1189                 if (!empty($data['site']['redmatrix'])) {
1190                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1191                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1192                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1193                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1194                         }
1195
1196                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1197                         $serverdata['network'] = Protocol::ZOT;
1198                 }
1199
1200                 $private = false;
1201                 $inviteonly = false;
1202                 $closed = false;
1203
1204                 if (!empty($data['site']['closed'])) {
1205                         $closed = self::toBoolean($data['site']['closed']);
1206                 }
1207
1208                 if (!empty($data['site']['private'])) {
1209                         $private = self::toBoolean($data['site']['private']);
1210                 }
1211
1212                 if (!empty($data['site']['inviteonly'])) {
1213                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1214                 }
1215
1216                 if (!$closed && !$private and $inviteonly) {
1217                         $serverdata['register_policy'] = Register::APPROVE;
1218                 } elseif (!$closed && !$private) {
1219                         $serverdata['register_policy'] = Register::OPEN;
1220                 } else {
1221                         $serverdata['register_policy'] = Register::CLOSED;
1222                 }
1223
1224                 if (!empty($serverdata['network']) && in_array($serverdata['detection-method'],
1225                         [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1226                         $serverdata['detection-method'] = self::DETECT_CONFIG_JSON;
1227                 }
1228
1229                 return $serverdata;
1230         }
1231
1232         /**
1233          * Converts input value to a boolean value
1234          *
1235          * @param string|integer $val
1236          *
1237          * @return boolean
1238          */
1239         private static function toBoolean($val)
1240         {
1241                 if (($val == 'true') || ($val == 1)) {
1242                         return true;
1243                 } elseif (($val == 'false') || ($val == 0)) {
1244                         return false;
1245                 }
1246
1247                 return $val;
1248         }
1249
1250         /**
1251          * Detect if the URL belongs to a GNU Social server
1252          *
1253          * @param string $url        URL of the given server
1254          * @param array  $serverdata array with server data
1255          *
1256          * @return array server data
1257          */
1258         private static function detectGNUSocial(string $url, array $serverdata)
1259         {
1260                 // Test for GNU Social
1261                 $curlResult = DI::httpRequest()->get($url . '/api/gnusocial/version.json');
1262                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1263                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1264                         $serverdata['platform'] = 'gnusocial';
1265                         // Remove junk that some GNU Social servers return
1266                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1267                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1268                         $serverdata['version'] = trim($serverdata['version'], '"');
1269                         $serverdata['network'] = Protocol::OSTATUS;
1270
1271                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1272                                 $serverdata['detection-method'] = self::DETECT_GNUSOCIAL;
1273                         }
1274
1275                         return $serverdata;
1276                 }
1277
1278                 // Test for Statusnet
1279                 $curlResult = DI::httpRequest()->get($url . '/api/statusnet/version.json');
1280                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1281                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1282
1283                         // Remove junk that some GNU Social servers return
1284                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1285                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1286                         $serverdata['version'] = trim($serverdata['version'], '"');
1287
1288                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1289                                 $serverdata['platform'] = 'pleroma';
1290                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1291                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1292                         } else {
1293                                 $serverdata['platform'] = 'statusnet';
1294                                 $serverdata['network'] = Protocol::OSTATUS;
1295                         }
1296
1297                         if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1298                                 $serverdata['detection-method'] = self::DETECT_STATUSNET;
1299                         }
1300                 }
1301
1302                 return $serverdata;
1303         }
1304
1305         /**
1306          * Detect if the URL belongs to a Friendica server
1307          *
1308          * @param string $url        URL of the given server
1309          * @param array  $serverdata array with server data
1310          *
1311          * @return array server data
1312          */
1313         private static function detectFriendica(string $url, array $serverdata)
1314         {
1315                 $curlResult = DI::httpRequest()->get($url . '/friendica/json');
1316                 if (!$curlResult->isSuccess()) {
1317                         $curlResult = DI::httpRequest()->get($url . '/friendika/json');
1318                         $friendika = true;
1319                         $platform = 'Friendika';
1320                 } else {
1321                         $friendika = false;
1322                         $platform = 'Friendica';
1323                 }
1324
1325                 if (!$curlResult->isSuccess()) {
1326                         return $serverdata;
1327                 }
1328
1329                 $data = json_decode($curlResult->getBody(), true);
1330                 if (empty($data) || empty($data['version'])) {
1331                         return $serverdata;
1332                 }
1333
1334                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
1335                         $serverdata['detection-method'] = $friendika ? self::DETECT_FRIENDIKA : self::DETECT_FRIENDICA;
1336                 }
1337
1338                 $serverdata['network'] = Protocol::DFRN;
1339                 $serverdata['version'] = $data['version'];
1340
1341                 if (!empty($data['no_scrape_url'])) {
1342                         $serverdata['noscrape'] = $data['no_scrape_url'];
1343                 }
1344
1345                 if (!empty($data['site_name'])) {
1346                         $serverdata['site_name'] = $data['site_name'];
1347                 }
1348
1349                 if (!empty($data['info'])) {
1350                         $serverdata['info'] = trim($data['info']);
1351                 }
1352
1353                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1354                 switch ($register_policy) {
1355                         case 'REGISTER_OPEN':
1356                                 $serverdata['register_policy'] = Register::OPEN;
1357                                 break;
1358
1359                         case 'REGISTER_APPROVE':
1360                                 $serverdata['register_policy'] = Register::APPROVE;
1361                                 break;
1362
1363                         case 'REGISTER_CLOSED':
1364                         case 'REGISTER_INVITATION':
1365                                 $serverdata['register_policy'] = Register::CLOSED;
1366                                 break;
1367                         default:
1368                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1369                                 $serverdata['register_policy'] = Register::CLOSED;
1370                                 break;
1371                 }
1372
1373                 $serverdata['platform'] = strtolower($data['platform'] ?? $platform);
1374
1375                 return $serverdata;
1376         }
1377
1378         /**
1379          * Analyses the landing page of a given server for hints about type and system of that server
1380          *
1381          * @param object $curlResult result of curl execution
1382          * @param array  $serverdata array with server data
1383          * @param string $url        Server URL
1384          *
1385          * @return array server data
1386          */
1387         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1388         {
1389                 $doc = new DOMDocument();
1390                 @$doc->loadHTML($curlResult->getBody());
1391                 $xpath = new DOMXPath($doc);
1392
1393                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1394                 if (!empty($title)) {
1395                         $serverdata['site_name'] = $title;
1396                 }
1397
1398                 $list = $xpath->query('//meta[@name]');
1399
1400                 foreach ($list as $node) {
1401                         $attr = [];
1402                         if ($node->attributes->length) {
1403                                 foreach ($node->attributes as $attribute) {
1404                                         $value = trim($attribute->value);
1405                                         if (empty($value)) {
1406                                                 continue;
1407                                         }
1408
1409                                         $attr[$attribute->name] = $value;
1410                                 }
1411
1412                                 if (empty($attr['name']) || empty($attr['content'])) {
1413                                         continue;
1414                                 }
1415                         }
1416
1417                         if ($attr['name'] == 'description') {
1418                                 $serverdata['info'] = $attr['content'];
1419                         }
1420
1421                         if (in_array($attr['name'], ['application-name', 'al:android:app_name', 'al:ios:app_name',
1422                                 'twitter:app:name:googleplay', 'twitter:app:name:iphone', 'twitter:app:name:ipad'])) {
1423                                 $serverdata['platform'] = strtolower($attr['content']);
1424                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1425                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1426                                 }
1427                         }
1428                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1429                                 $serverdata['platform'] = strtolower($attr['content']);
1430                                 $version_part = explode(' ', $attr['content']);
1431
1432                                 if (count($version_part) == 2) {
1433                                         if (in_array($version_part[0], ['WordPress'])) {
1434                                                 $serverdata['platform'] = strtolower($version_part[0]);
1435                                                 $serverdata['version'] = $version_part[1];
1436
1437                                                 // We still do need a reliable test if some AP plugin is activated
1438                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1439                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1440                                                 } else {
1441                                                         $serverdata['network'] = Protocol::FEED;
1442                                                 }
1443
1444                                                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1445                                                         $serverdata['detection-method'] = self::DETECT_BODY;
1446                                                 }
1447                                         }
1448                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1449                                                 $serverdata['platform'] = strtolower($version_part[0]);
1450                                                 $serverdata['version'] = $version_part[1];
1451                                                 $serverdata['network'] = Protocol::DFRN;
1452                                         }
1453                                 }
1454                         }
1455                 }
1456
1457                 $list = $xpath->query('//meta[@property]');
1458
1459                 foreach ($list as $node) {
1460                         $attr = [];
1461                         if ($node->attributes->length) {
1462                                 foreach ($node->attributes as $attribute) {
1463                                         $value = trim($attribute->value);
1464                                         if (empty($value)) {
1465                                                 continue;
1466                                         }
1467
1468                                         $attr[$attribute->name] = $value;
1469                                 }
1470
1471                                 if (empty($attr['property']) || empty($attr['content'])) {
1472                                         continue;
1473                                 }
1474                         }
1475
1476                         if ($attr['property'] == 'og:site_name') {
1477                                 $serverdata['site_name'] = $attr['content'];
1478                         }
1479
1480                         if ($attr['property'] == 'og:description') {
1481                                 $serverdata['info'] = $attr['content'];
1482                         }
1483
1484                         if ($attr['property'] == 'og:platform') {
1485                                 $serverdata['platform'] = strtolower($attr['content']);
1486
1487                                 if (in_array($attr['content'], ['PeerTube'])) {
1488                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1489                                 }
1490                         }
1491
1492                         if ($attr['property'] == 'generator') {
1493                                 $serverdata['platform'] = strtolower($attr['content']);
1494
1495                                 if (in_array($attr['content'], ['hubzilla'])) {
1496                                         // We later check which compatible protocol modules are loaded.
1497                                         $serverdata['network'] = Protocol::ZOT;
1498                                 }
1499                         }
1500                 }
1501
1502                 if (!empty($serverdata['network']) && ($serverdata['detection-method'] == self::DETECT_MANUAL)) {
1503                         $serverdata['detection-method'] = self::DETECT_BODY;
1504                 }
1505
1506                 return $serverdata;
1507         }
1508
1509         /**
1510          * Analyses the header data of a given server for hints about type and system of that server
1511          *
1512          * @param object $curlResult result of curl execution
1513          * @param array  $serverdata array with server data
1514          *
1515          * @return array server data
1516          */
1517         private static function analyseRootHeader($curlResult, array $serverdata)
1518         {
1519                 if ($curlResult->getHeader('server') == 'Mastodon') {
1520                         $serverdata['platform'] = 'mastodon';
1521                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1522                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1523                         $serverdata['platform'] = 'diaspora';
1524                         $serverdata['network'] = Protocol::DIASPORA;
1525                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1526                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1527                         $serverdata['platform'] = 'friendica';
1528                         $serverdata['network'] = Protocol::DFRN;
1529                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1530                 } else {
1531                         return $serverdata;
1532                 }
1533
1534                 if ($serverdata['detection-method'] == self::DETECT_MANUAL) {
1535                         $serverdata['detection-method'] = self::DETECT_HEADER;
1536                 }
1537
1538                 return $serverdata;
1539         }
1540
1541         /**
1542          * Test if the body contains valid content
1543          *
1544          * @param string $body
1545          * @return boolean
1546          */
1547         private static function invalidBody(string $body)
1548         {
1549                 // Currently we only test for a HTML element.
1550                 // Possibly we enhance this in the future.
1551                 return !strpos($body, '>');
1552         }
1553
1554         /**
1555          * Update GServer entries
1556          */
1557         public static function discover()
1558         {
1559                 // Update the server list
1560                 self::discoverFederation();
1561
1562                 $no_of_queries = 5;
1563
1564                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1565
1566                 if ($requery_days == 0) {
1567                         $requery_days = 7;
1568                 }
1569
1570                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1571
1572                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`, `directory-type`
1573                         FROM `gserver`
1574                         WHERE NOT `failed`
1575                         AND `directory-type` != ?
1576                         AND `last_poco_query` < ?
1577                         ORDER BY RAND()", self::DT_NONE, $last_update
1578                 );
1579
1580                 while ($gserver = DBA::fetch($gservers)) {
1581                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1582                                 // The server is not reachable? Okay, then we will try it later
1583                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1584                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1585                                 continue;
1586                         }
1587
1588                         Logger::info('Update peer list', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1589                         Worker::add(PRIORITY_LOW, 'UpdateServerPeers', $gserver['url']);
1590
1591                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1592                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1593
1594                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1595                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1596
1597                         if (--$no_of_queries == 0) {
1598                                 break;
1599                         }
1600                 }
1601
1602                 DBA::close($gservers);
1603         }
1604
1605         /**
1606          * Discover federated servers
1607          */
1608         private static function discoverFederation()
1609         {
1610                 $last = DI::config()->get('poco', 'last_federation_discovery');
1611
1612                 if ($last) {
1613                         $next = $last + (24 * 60 * 60);
1614
1615                         if ($next > time()) {
1616                                 return;
1617                         }
1618                 }
1619
1620                 // Discover federated servers
1621                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1622                 foreach ($protocols as $protocol) {
1623                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1624                         $curlResult = DI::httpRequest()->fetch('https://the-federation.info/graphql?query=' . urlencode($query));
1625                         if (!empty($curlResult)) {
1626                                 $data = json_decode($curlResult, true);
1627                                 if (!empty($data['data']['nodes'])) {
1628                                         foreach ($data['data']['nodes'] as $server) {
1629                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1630                                                 Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1631                                         }
1632                                 }
1633                         }
1634                 }
1635
1636                 // Disvover Mastodon servers
1637                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1638
1639                 if (!empty($accesstoken)) {
1640                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1641                         $header = ['Authorization: Bearer '.$accesstoken];
1642                         $curlResult = DI::httpRequest()->get($api, ['headers' => $header]);
1643
1644                         if ($curlResult->isSuccess()) {
1645                                 $servers = json_decode($curlResult->getBody(), true);
1646
1647                                 foreach ($servers['instances'] as $server) {
1648                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1649                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1650                                 }
1651                         }
1652                 }
1653
1654                 DI::config()->set('poco', 'last_federation_discovery', time());
1655         }
1656 }