src/Model/GServer.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Core\Protocol;
  27 use Friendica\Core\Worker;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Module\Register;
  31 use Friendica\Network\CurlResult;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\DateTimeFormat;
  34 use Friendica\Util\Strings;
  35 use Friendica\Util\XML;
  36 use Friendica\Core\Logger;
  37 use Friendica\Core\System;
  38 use Friendica\Protocol\PortableContact;
  39 use Friendica\Protocol\Diaspora;
  40
  41 /**
  42  * This class handles GServer related functions
  43  */
  44 class GServer
  45 {
  46         // Directory types
  47         const DT_NONE = 0;
  48         const DT_POCO = 1;
  49         const DT_MASTODON = 2;
  50
  51         // Methods to detect server types
  52
  53         // Non endpoint specific methods
  54         const DETECT_MANUAL = 0;
  55         const DETECT_HEADER = 1;
  56         const DETECT_BODY = 2;
  57
  58         // Implementation specific endpoints
  59         const DETECT_FRIENDIKA = 10;
  60         const DETECT_FRIENDICA = 11;
  61         const DETECT_STATUSNET = 12;
  62         const DETECT_GNUSOCIAL = 13;
  63         const DETECT_CONFIG_JSON = 14; // Statusnet, GNU Social, Older Hubzilla/Redmatrix
  64         const DETECT_SITEINFO_JSON = 15; // Newer Hubzilla
  65         const DETECT_MASTODON_API = 16;
  66         const DETECT_STATUS_PHP = 17; // Nextcloud
  67
  68         // Standardized endpoints
  69         const DETECT_STATISTICS_JSON = 100;
  70         const DETECT_NODEINFO_1 = 101;
  71         const DETECT_NODEINFO_2 = 102;
  72
  73         /**
  74          * Get the ID for the given server URL
  75          *
  76          * @param string $url
  77          * @param boolean $no_check Don't check if the server hadn't been found
  78          * @return int gserver id
  79          */
  80         public static function getID(string $url, bool $no_check = false)
  81         {
  82                 if (empty($url)) {
  83                         return null;
  84                 }
  85
  86                 $url = self::cleanURL($url);
  87
  88                 $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => Strings::normaliseLink($url)]);
  89                 if (DBA::isResult($gserver)) {
  90                         Logger::info('Got ID for URL', ['id' => $gserver['id'], 'url' => $url, 'callstack' => System::callstack(20)]);
  91                         return $gserver['id'];
  92                 }
  93
  94                 if ($no_check || !self::check($url)) {
  95                         return null;
  96                 }
  97
  98                 return self::getID($url, true);
  99         }
 100
 101         /**
 102          * Checks if the given server is reachable
 103          *
 104          * @param string  $profile URL of the given profile
 105          * @param string  $server  URL of the given server (If empty, taken from profile)
 106          * @param string  $network Network value that is used, when detection failed
 107          * @param boolean $force   Force an update.
 108          *
 109          * @return boolean 'true' if server seems vital
 110          */
 111         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
 112         {
 113                 if ($server == '') {
 114                         $server = GContact::getBasepath($profile);
 115                 }
 116
 117                 if ($server == '') {
 118                         return true;
 119                 }
 120
 121                 return self::check($server, $network, $force);
 122         }
 123
 124         /**
 125          * Decides if a server needs to be updated, based upon several date fields
 126          *
 127          * @param date $created      Creation date of that server entry
 128          * @param date $updated      When had the server entry be updated
 129          * @param date $last_failure Last failure when contacting that server
 130          * @param date $last_contact Last time the server had been contacted
 131          *
 132          * @return boolean Does the server record needs an update?
 133          */
 134         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 135         {
 136                 $now = strtotime(DateTimeFormat::utcNow());
 137
 138                 if ($updated > $last_contact) {
 139                         $contact_time = strtotime($updated);
 140                 } else {
 141                         $contact_time = strtotime($last_contact);
 142                 }
 143
 144                 $failure_time = strtotime($last_failure);
 145                 $created_time = strtotime($created);
 146
 147                 // If there is no "created" time then use the current time
 148                 if ($created_time <= 0) {
 149                         $created_time = $now;
 150                 }
 151
 152                 // If the last contact was less than 24 hours then don't update
 153                 if (($now - $contact_time) < (60 * 60 * 24)) {
 154                         return false;
 155                 }
 156
 157                 // If the last failure was less than 24 hours then don't update
 158                 if (($now - $failure_time) < (60 * 60 * 24)) {
 159                         return false;
 160                 }
 161
 162                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 163                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 164                 //      return false;
 165
 166                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 167                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 168                         return false;
 169                 }
 170
 171                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 172                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 173                         return false;
 174                 }
 175
 176                 return true;
 177         }
 178
 179         /**
 180          * Checks the state of the given server.
 181          *
 182          * @param string  $server_url    URL of the given server
 183          * @param string  $network       Network value that is used, when detection failed
 184          * @param boolean $force         Force an update.
 185          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 186          *
 187          * @return boolean 'true' if server seems vital
 188          */
 189         public static function check(string $server_url, string $network = '', bool $force = false, bool $only_nodeinfo = false)
 190         {
 191                 $server_url = self::cleanURL($server_url);
 192
 193                 if ($server_url == '') {
 194                         return false;
 195                 }
 196
 197                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 198                 if (DBA::isResult($gserver)) {
 199                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 200                                 $fields = ['created' => DateTimeFormat::utcNow()];
 201                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 202                                 DBA::update('gserver', $fields, $condition);
 203                         }
 204
 205                         $last_contact = $gserver['last_contact'];
 206                         $last_failure = $gserver['last_failure'];
 207
 208                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 209                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 210                         if ($last_contact < DBA::NULL_DATETIME) {
 211                                 $last_contact = DBA::NULL_DATETIME;
 212                         }
 213
 214                         if ($last_failure < DBA::NULL_DATETIME) {
 215                                 $last_failure = DBA::NULL_DATETIME;
 216                         }
 217
 218                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 219                                 Logger::info('No update needed', ['server' => $server_url]);
 220                                 return ($last_contact >= $last_failure);
 221                         }
 222                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 223                 } else {
 224                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 225                 }
 226
 227                 return self::detect($server_url, $network, $only_nodeinfo);
 228         }
 229
 230         /**
 231          * Set failed server status
 232          *
 233          * @param string $url
 234          */
 235         private static function setFailure(string $url)
 236         {
 237                 if (DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 238                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow(), 'detection-method' => null],
 239                         ['nurl' => Strings::normaliseLink($url)]);
 240                         Logger::info('Set failed status for existing server', ['url' => $url]);
 241                         return;
 242                 }
 243                 DBA::insert('gserver', ['url' => $url, 'nurl' => Strings::normaliseLink($url),
 244                         'network' => Protocol::PHANTOM, 'created' => DateTimeFormat::utcNow(),
 245                         'last_failure' => DateTimeFormat::utcNow()]);
 246                 Logger::info('Set failed status for new server', ['url' => $url]);
 247         }
 248
 249         /**
 250          * Remove unwanted content from the given URL
 251          *
 252          * @param string $url
 253          * @return string cleaned URL
 254          */
 255         public static function cleanURL(string $url)
 256         {
 257                 $url = trim($url, '/');
 258                 $url = str_replace('/index.php', '', $url);
 259
 260                 $urlparts = parse_url($url);
 261                 unset($urlparts['user']);
 262                 unset($urlparts['pass']);
 263                 unset($urlparts['query']);
 264                 unset($urlparts['fragment']);
 265                 return Network::unparseURL($urlparts);
 266         }
 267
 268         /**
 269          * Return the base URL
 270          *
 271          * @param string $url
 272          * @return string base URL
 273          */
 274         private static function getBaseURL(string $url)
 275         {
 276                 $urlparts = parse_url(self::cleanURL($url));
 277                 unset($urlparts['path']);
 278                 return Network::unparseURL($urlparts);
 279         }
 280
 281         /**
 282          * Detect server data (type, protocol, version number, ...)
 283          * The detected data is then updated or inserted in the gserver table.
 284          *
 285          * @param string  $url           URL of the given server
 286          * @param string  $network       Network value that is used, when detection failed
 287          * @param boolean $only_nodeinfo Only use nodeinfo for server detection
 288          *
 289          * @return boolean 'true' if server could be detected
 290          */
 291         public static function detect(string $url, string $network = '', bool $only_nodeinfo = false)
 292         {
 293                 Logger::info('Detect server type', ['server' => $url]);
 294                 $serverdata = ['detection-method' => self::DETECT_MANUAL];
 295
 296                 $original_url = $url;
 297
 298                 // Remove URL content that is not supposed to exist for a server url
 299                 $url = self::cleanURL($url);
 300
 301                 // Get base URL
 302                 $baseurl = self::getBaseURL($url);
 303
 304                 // If the URL missmatches, then we mark the old entry as failure
 305                 if ($url != $original_url) {
 306                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($original_url)]);
 307                 }
 308
 309                 // When a nodeinfo is present, we don't need to dig further
 310                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 311                 $curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 312                 if ($curlResult->isTimeout()) {
 313                         self::setFailure($url);
 314                         return false;
 315                 }
 316
 317                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 318                 if ($only_nodeinfo && empty($nodeinfo)) {
 319                         Logger::info('Invalid nodeinfo in nodeinfo-mode, server is marked as failure', ['url' => $url]);
 320                         self::setFailure($url);
 321                         return false;
 322                 }
 323
 324                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 325                 if (empty($nodeinfo)) {
 326                         $nodeinfo = self::fetchStatistics($url);
 327                 }
 328
 329                 // If that didn't work out well, we use some protocol specific endpoints
 330                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 331                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 332                         if (!empty($nodeinfo['detection-method'])) {
 333                                 $serverdata['detection-method'] = $nodeinfo['detection-method'];
 334                         }
 335
 336                         // Fetch the landing page, possibly it reveals some data
 337                         if (empty($nodeinfo['network'])) {
 338                                 if ($baseurl == $url) {
 339                                         $basedata = $serverdata;
 340                                 } else {
 341                                         $basedata = ['detection-method' => self::DETECT_MANUAL];
 342                                 }
 343
 344                                 $curlResult = Network::curl($baseurl, false, ['timeout' => $xrd_timeout]);
 345                                 if ($curlResult->isSuccess()) {
 346                                         $basedata = self::analyseRootHeader($curlResult, $basedata);
 347                                         $basedata = self::analyseRootBody($curlResult, $basedata, $baseurl);
 348                                 }
 349
 350                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 351                                         self::setFailure($url);
 352                                         return false;
 353                                 }
 354
 355                                 if ($baseurl == $url) {
 356                                         $serverdata = $basedata;
 357                                 } else {
 358                                         // When the base path doesn't seem to contain a social network we try the complete path.
 359                                         // Most detectable system have to be installed in the root directory.
 360                                         // We checked the base to avoid false positives.
 361                                         $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 362                                         if ($curlResult->isSuccess()) {
 363                                                 $urldata = self::analyseRootHeader($curlResult, $serverdata);
 364                                                 $urldata = self::analyseRootBody($curlResult, $urldata, $url);
 365
 366                                                 $comparebase = $basedata;
 367                                                 unset($comparebase['info']);
 368                                                 unset($comparebase['site_name']);
 369                                                 $compareurl = $urldata;
 370                                                 unset($compareurl['info']);
 371                                                 unset($compareurl['site_name']);
 372
 373                                                 // We assume that no one will install the identical system in the root and a subfolder
 374                                                 if (!empty(array_diff($comparebase, $compareurl))) {
 375                                                         $serverdata = $urldata;
 376                                                 }
 377                                         }
 378                                 }
 379                         }
 380
 381                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 382                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 383                         }
 384
 385                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 386                         // With this check we don't have to waste time and ressources for dead systems.
 387                         // Also this hopefully prevents us from receiving abuse messages.
 388                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 389                                 self::setFailure($url);
 390                                 return false;
 391                         }
 392
 393                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 394                                 $serverdata = self::detectFriendica($url, $serverdata);
 395                         }
 396
 397                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 398                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 399                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 400                         }
 401
 402                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 403                         if (empty($serverdata['network'])) {
 404                                 $serverdata = self::detectHubzilla($url, $serverdata);
 405                         }
 406
 407                         if (empty($serverdata['network'])) {
 408                                 $serverdata = self::detectNextcloud($url, $serverdata);
 409                         }
 410
 411                         if (empty($serverdata['network'])) {
 412                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 413                         }
 414
 415                         $serverdata = array_merge($nodeinfo, $serverdata);
 416                 } else {
 417                         $serverdata = $nodeinfo;
 418                 }
 419
 420                 // Detect the directory type
 421                 $serverdata['directory-type'] = self::DT_NONE;
 422                 $serverdata = self::checkPoCo($url, $serverdata);
 423                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 424
 425                 // We can't detect the network type. Possibly it is some system that we don't know yet
 426                 if (empty($serverdata['network'])) {
 427                         $serverdata['network'] = Protocol::PHANTOM;
 428                 }
 429
 430                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 431                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 432                         $serverdata['network'] = $network;
 433                 }
 434
 435                 $serverdata['url'] = $url;
 436                 $serverdata['nurl'] = Strings::normaliseLink($url);
 437
 438                 // We take the highest number that we do find
 439                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 440
 441                 // On an active server there has to be at least a single user
 442                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 443                         $registeredUsers = 1;
 444                 }
 445
 446                 if ($serverdata['network'] == Protocol::PHANTOM) {
 447                         $serverdata['registered-users'] = $registeredUsers;
 448                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 449                 }
 450
 451                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 452
 453                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 454                 if (!DBA::isResult($gserver)) {
 455                         $serverdata['created'] = DateTimeFormat::utcNow();
 456                         $ret = DBA::insert('gserver', $serverdata);
 457                         $id = DBA::lastInsertId();
 458                 } else {
 459                         // Don't override the network with 'unknown' when there had been a valid entry before
 460                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 461                                 unset($serverdata['network']);
 462                         }
 463
 464                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 465                         $gserver = DBA::selectFirst('gserver', ['id'], ['nurl' => $serverdata['nurl']]);
 466                         if (DBA::isResult($gserver)) {
 467                                 $id = $gserver['id'];
 468                         }
 469                 }
 470
 471                 if (!empty($serverdata['network']) && !empty($id) && ($serverdata['network'] != Protocol::PHANTOM)) {
 472                         $gcontacts = DBA::count('gcontact', ['gsid' => $id]);
 473                         $apcontacts = DBA::count('apcontact', ['gsid' => $id]);
 474                         $contacts = DBA::count('contact', ['uid' => 0, 'gsid' => $id]);
 475                         $max_users = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 476                         if ($max_users > $registeredUsers) {
 477                                 Logger::info('Update registered users', ['id' => $id, 'url' => $serverdata['nurl'], 'registered-users' => $max_users]);
 478                                 DBA::update('gserver', ['registered-users' => $max_users], ['id' => $id]);
 479                         }
 480                 }
 481
 482                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 483                         self::discoverRelay($url);
 484                 }
 485
 486                 return $ret;
 487         }
 488
 489         /**
 490          * Fetch relay data from a given server url
 491          *
 492          * @param string $server_url address of the server
 493          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 494          */
 495         private static function discoverRelay(string $server_url)
 496         {
 497                 Logger::info('Discover relay data', ['server' => $server_url]);
 498
 499                 $curlResult = Network::curl($server_url . '/.well-known/x-social-relay');
 500                 if (!$curlResult->isSuccess()) {
 501                         return;
 502                 }
 503
 504                 $data = json_decode($curlResult->getBody(), true);
 505                 if (!is_array($data)) {
 506                         return;
 507                 }
 508
 509                 // Sanitize incoming data, see https://github.com/friendica/friendica/issues/8565
 510                 $data['subscribe'] = (bool)$data['subscribe'] ?? false;
 511
 512                 if (!$data['subscribe'] || empty($data['scope']) || !in_array(strtolower($data['scope']), ['all', 'tags'])) {
 513                         $data['scope'] = '';
 514                         $data['subscribe'] = false;
 515                         $data['tags'] = [];
 516                 }
 517
 518                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 519                 if (!DBA::isResult($gserver)) {
 520                         return;
 521                 }
 522
 523                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 524                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 525                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 526                 }
 527
 528                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 529
 530                 if ($data['scope'] == 'tags') {
 531                         // Avoid duplicates
 532                         $tags = [];
 533                         foreach ($data['tags'] as $tag) {
 534                                 $tag = mb_strtolower($tag);
 535                                 if (strlen($tag) < 100) {
 536                                         $tags[$tag] = $tag;
 537                                 }
 538                         }
 539
 540                         foreach ($tags as $tag) {
 541                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 542                         }
 543                 }
 544
 545                 // Create or update the relay contact
 546                 $fields = [];
 547                 if (isset($data['protocols'])) {
 548                         if (isset($data['protocols']['diaspora'])) {
 549                                 $fields['network'] = Protocol::DIASPORA;
 550
 551                                 if (isset($data['protocols']['diaspora']['receive'])) {
 552                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 553                                 } elseif (is_string($data['protocols']['diaspora'])) {
 554                                         $fields['batch'] = $data['protocols']['diaspora'];
 555                                 }
 556                         }
 557
 558                         if (isset($data['protocols']['dfrn'])) {
 559                                 $fields['network'] = Protocol::DFRN;
 560
 561                                 if (isset($data['protocols']['dfrn']['receive'])) {
 562                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 563                                 } elseif (is_string($data['protocols']['dfrn'])) {
 564                                         $fields['batch'] = $data['protocols']['dfrn'];
 565                                 }
 566                         }
 567                 }
 568                 Diaspora::setRelayContact($server_url, $fields);
 569         }
 570
 571         /**
 572          * Fetch server data from '/statistics.json' on the given server
 573          *
 574          * @param string $url URL of the given server
 575          *
 576          * @return array server data
 577          */
 578         private static function fetchStatistics(string $url)
 579         {
 580                 $curlResult = Network::curl($url . '/statistics.json');
 581                 if (!$curlResult->isSuccess()) {
 582                         return [];
 583                 }
 584
 585                 $data = json_decode($curlResult->getBody(), true);
 586                 if (empty($data)) {
 587                         return [];
 588                 }
 589
 590                 $serverdata = ['detection-method' => self::DETECT_STATISTICS_JSON];
 591
 592                 if (!empty($data['version'])) {
 593                         $serverdata['version'] = $data['version'];
 594                         // Version numbers on statistics.json are presented with additional info, e.g.:
 595                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 596                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 597                 }
 598
 599                 if (!empty($data['name'])) {
 600                         $serverdata['site_name'] = $data['name'];
 601                 }
 602
 603                 if (!empty($data['network'])) {
 604                         $serverdata['platform'] = strtolower($data['network']);
 605
 606                         if ($serverdata['platform'] == 'diaspora') {
 607                                 $serverdata['network'] = Protocol::DIASPORA;
 608                         } elseif ($serverdata['platform'] == 'friendica') {
 609                                 $serverdata['network'] = Protocol::DFRN;
 610                         } elseif ($serverdata['platform'] == 'hubzilla') {
 611                                 $serverdata['network'] = Protocol::ZOT;
 612                         } elseif ($serverdata['platform'] == 'redmatrix') {
 613                                 $serverdata['network'] = Protocol::ZOT;
 614                         }
 615                 }
 616
 617
 618                 if (!empty($data['registrations_open'])) {
 619                         $serverdata['register_policy'] = Register::OPEN;
 620                 } else {
 621                         $serverdata['register_policy'] = Register::CLOSED;
 622                 }
 623
 624                 return $serverdata;
 625         }
 626
 627         /**
 628          * Detect server type by using the nodeinfo data
 629          *
 630          * @param string     $url        address of the server
 631          * @param CurlResult $curlResult
 632          * @return array Server data
 633          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 634          */
 635         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 636         {
 637                 if (!$curlResult->isSuccess()) {
 638                         return [];
 639                 }
 640
 641                 $nodeinfo = json_decode($curlResult->getBody(), true);
 642
 643                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 644                         return [];
 645                 }
 646
 647                 $nodeinfo1_url = '';
 648                 $nodeinfo2_url = '';
 649
 650                 foreach ($nodeinfo['links'] as $link) {
 651                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 652                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 653                                 continue;
 654                         }
 655                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 656                                 $nodeinfo1_url = $link['href'];
 657                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 658                                 $nodeinfo2_url = $link['href'];
 659                         }
 660                 }
 661
 662                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 663                         return [];
 664                 }
 665
 666                 $server = [];
 667
 668                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 669                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 670                         $server = self::parseNodeinfo2($nodeinfo2_url);
 671                 }
 672
 673                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 674                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 675                         $server = self::parseNodeinfo1($nodeinfo1_url);
 676                 }
 677
 678                 return $server;
 679         }
 680
 681         /**
 682          * Parses Nodeinfo 1
 683          *
 684          * @param string $nodeinfo_url address of the nodeinfo path
 685          * @return array Server data
 686          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 687          */
 688         private static function parseNodeinfo1(string $nodeinfo_url)
 689         {
 690                 $curlResult = Network::curl($nodeinfo_url);
 691                 if (!$curlResult->isSuccess()) {
 692                         return [];
 693                 }
 694
 695                 $nodeinfo = json_decode($curlResult->getBody(), true);
 696
 697                 if (!is_array($nodeinfo)) {
 698                         return [];
 699                 }
 700
 701                 $server = ['detection-method' => self::DETECT_NODEINFO_1,
 702                         'register_policy' => Register::CLOSED];
 703
 704                 if (!empty($nodeinfo['openRegistrations'])) {
 705                         $server['register_policy'] = Register::OPEN;
 706                 }
 707
 708                 if (is_array($nodeinfo['software'])) {
 709                         if (!empty($nodeinfo['software']['name'])) {
 710                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 711                         }
 712
 713                         if (!empty($nodeinfo['software']['version'])) {
 714                                 $server['version'] = $nodeinfo['software']['version'];
 715                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 716                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 717                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 718                         }
 719                 }
 720
 721                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 722                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 723                 }
 724
 725                 if (!empty($nodeinfo['usage']['users']['total'])) {
 726                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 727                 }
 728
 729                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 730                         $protocols = [];
 731                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 732                                 $protocols[$protocol] = true;
 733                         }
 734
 735                         if (!empty($protocols['friendica'])) {
 736                                 $server['network'] = Protocol::DFRN;
 737                         } elseif (!empty($protocols['activitypub'])) {
 738                                 $server['network'] = Protocol::ACTIVITYPUB;
 739                         } elseif (!empty($protocols['diaspora'])) {
 740                                 $server['network'] = Protocol::DIASPORA;
 741                         } elseif (!empty($protocols['ostatus'])) {
 742                                 $server['network'] = Protocol::OSTATUS;
 743                         } elseif (!empty($protocols['gnusocial'])) {
 744                                 $server['network'] = Protocol::OSTATUS;
 745                         } elseif (!empty($protocols['zot'])) {
 746                                 $server['network'] = Protocol::ZOT;
 747                         }
 748                 }
 749
 750                 if (empty($server)) {
 751                         return [];
 752                 }
 753
 754                 return $server;
 755         }
 756
 757         /**
 758          * Parses Nodeinfo 2
 759          *
 760          * @param string $nodeinfo_url address of the nodeinfo path
 761          * @return array Server data
 762          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 763          */
 764         private static function parseNodeinfo2(string $nodeinfo_url)
 765         {
 766                 $curlResult = Network::curl($nodeinfo_url);
 767                 if (!$curlResult->isSuccess()) {
 768                         return [];
 769                 }
 770
 771                 $nodeinfo = json_decode($curlResult->getBody(), true);
 772
 773                 if (!is_array($nodeinfo)) {
 774                         return [];
 775                 }
 776
 777                 $server = ['detection-method' => self::DETECT_NODEINFO_2,
 778                         'register_policy' => Register::CLOSED];
 779
 780                 if (!empty($nodeinfo['openRegistrations'])) {
 781                         $server['register_policy'] = Register::OPEN;
 782                 }
 783
 784                 if (is_array($nodeinfo['software'])) {
 785                         if (!empty($nodeinfo['software']['name'])) {
 786                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 787                         }
 788
 789                         if (!empty($nodeinfo['software']['version'])) {
 790                                 $server['version'] = $nodeinfo['software']['version'];
 791                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 792                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 793                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 794                         }
 795                 }
 796
 797                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 798                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 799                 }
 800
 801                 if (!empty($nodeinfo['usage']['users']['total'])) {
 802                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 803                 }
 804
 805                 if (!empty($nodeinfo['protocols'])) {
 806                         $protocols = [];
 807                         foreach ($nodeinfo['protocols'] as $protocol) {
 808                                 $protocols[$protocol] = true;
 809                         }
 810
 811                         if (!empty($protocols['dfrn'])) {
 812                                 $server['network'] = Protocol::DFRN;
 813                         } elseif (!empty($protocols['activitypub'])) {
 814                                 $server['network'] = Protocol::ACTIVITYPUB;
 815                         } elseif (!empty($protocols['diaspora'])) {
 816                                 $server['network'] = Protocol::DIASPORA;
 817                         } elseif (!empty($protocols['ostatus'])) {
 818                                 $server['network'] = Protocol::OSTATUS;
 819                         } elseif (!empty($protocols['gnusocial'])) {
 820                                 $server['network'] = Protocol::OSTATUS;
 821                         } elseif (!empty($protocols['zot'])) {
 822                                 $server['network'] = Protocol::ZOT;
 823                         }
 824                 }
 825
 826                 if (empty($server)) {
 827                         return [];
 828                 }
 829
 830                 return $server;
 831         }
 832
 833         /**
 834          * Fetch server information from a 'siteinfo.json' file on the given server
 835          *
 836          * @param string $url        URL of the given server
 837          * @param array  $serverdata array with server data
 838          *
 839          * @return array server data
 840          */
 841         private static function fetchSiteinfo(string $url, array $serverdata)
 842         {
 843                 $curlResult = Network::curl($url . '/siteinfo.json');
 844                 if (!$curlResult->isSuccess()) {
 845                         return $serverdata;
 846                 }
 847
 848                 $data = json_decode($curlResult->getBody(), true);
 849                 if (empty($data)) {
 850                         return $serverdata;
 851                 }
 852
 853                 if (in_array($serverdata['detection-method'], [self::DETECT_HEADER, self::DETECT_BODY, self::DETECT_MANUAL])) {
 854                         $serverdata['detection-method'] = self::DETECT_SITEINFO_JSON;
 855                 }
 856
 857                 if (!empty($data['url'])) {
 858                         $serverdata['platform'] = strtolower($data['platform']);
 859                         $serverdata['version'] = $data['version'];
 860                 }
 861
 862                 if (!empty($data['plugins'])) {
 863                         if (in_array('pubcrawl', $data['plugins'])) {
 864                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 865                         } elseif (in_array('diaspora', $data['plugins'])) {
 866                                 $serverdata['network'] = Protocol::DIASPORA;
 867                         } elseif (in_array('gnusoc', $data['plugins'])) {
 868                                 $serverdata['network'] = Protocol::OSTATUS;
 869                         } else {
 870                                 $serverdata['network'] = Protocol::ZOT;
 871                         }
 872                 }
 873
 874                 if (!empty($data['site_name'])) {
 875                         $serverdata['site_name'] = $data['site_name'];
 876                 }
 877
 878                 if (!empty($data['channels_total'])) {
 879                         $serverdata['registered-users'] = $data['channels_total'];
 880                 }
 881
 882                 if (!empty($data['register_policy'])) {
 883                         switch ($data['register_policy']) {
 884                                 case 'REGISTER_OPEN':
 885                                         $serverdata['register_policy'] = Register::OPEN;
 886                                         break;
 887
 888                                 case 'REGISTER_APPROVE':
 889                                         $serverdata['register_policy'] = Register::APPROVE;
 890                                         break;
 891
 892                                 case 'REGISTER_CLOSED':
 893                                 default:
 894                                         $serverdata['register_policy'] = Register::CLOSED;
 895                                         break;
 896                         }
 897                 }
 898
 899                 return $serverdata;
 900         }
 901
 902         /**
 903          * Checks if the server contains a valid host meta file
 904          *
 905          * @param string $url URL of the given server
 906          *
 907          * @return boolean 'true' if the server seems to be vital
 908          */
 909         private static function validHostMeta(string $url)
 910         {
 911                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 912                 $curlResult = Network::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 913                 if (!$curlResult->isSuccess()) {
 914                         return false;
 915                 }
 916
 917                 $xrd = XML::parseString($curlResult->getBody());
 918                 if (!is_object($xrd)) {
 919                         return false;
 920                 }
 921
 922                 $elements = XML::elementToArray($xrd);
 923                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 924                         return false;
 925                 }
 926
 927                 $valid = false;
 928                 foreach ($elements['xrd']['link'] as $link) {
 929                         // When there is more than a single "link" element, the array looks slightly different
 930                         if (!empty($link['@attributes'])) {
 931                                 $link = $link['@attributes'];
 932                         }
 933
 934                         if (empty($link['rel']) || empty($link['template'])) {
 935                                 continue;
 936                         }
 937
 938                         if ($link['rel'] == 'lrdd') {
 939                                 // When the webfinger host is the same like the system host, it should be ok.
 940                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 941                         }
 942                 }
 943
 944                 return $valid;
 945         }
 946
 947         /**
 948          * Detect the network of the given server via their known contacts
 949          *
 950          * @param string $url        URL of the given server
 951          * @param array  $serverdata array with server data
 952          *
 953          * @return array server data
 954          */
 955         private static function detectNetworkViaContacts(string $url, array $serverdata)
 956         {
 957                 $contacts = [];
 958
 959                 $gcontacts = DBA::select('gcontact', ['url', 'nurl'], ['server_url' => [$url, $serverdata['nurl']]]);
 960                 while ($gcontact = DBA::fetch($gcontacts)) {
 961                         $contacts[$gcontact['nurl']] = $gcontact['url'];
 962                 }
 963                 DBA::close($gcontacts);
 964
 965                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 966                 while ($apcontact = DBA::fetch($apcontacts)) {
 967                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 968                 }
 969                 DBA::close($apcontacts);
 970
 971                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 972                 while ($pcontact = DBA::fetch($pcontacts)) {
 973                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 974                 }
 975                 DBA::close($pcontacts);
 976
 977                 if (empty($contacts)) {
 978                         return $serverdata;
 979                 }
 980
 981                 foreach ($contacts as $contact) {
 982                         $probed = Contact::getByURL($contact);
 983                         if (!empty($probed) && in_array($probed['network'], Protocol::FEDERATED)) {
 984                                 $serverdata['network'] = $probed['network'];
 985                                 break;
 986                         }
 987                 }
 988
 989                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 990
 991                 return $serverdata;
 992         }
 993
 994         /**
 995          * Checks if the given server does have a '/poco' endpoint.
 996          * This is used for the 'PortableContact' functionality,
 997          * which is used by both Friendica and Hubzilla.
 998          *
 999          * @param string $url        URL of the given server
1000          * @param array  $serverdata array with server data
1001          *
1002          * @return array server data
1003          */
1004         private static function checkPoCo(string $url, array $serverdata)
1005         {
1006                 $serverdata['poco'] = '';
1007
1008                 $curlResult = Network::curl($url. '/poco');
1009                 if (!$curlResult->isSuccess()) {
1010                         return $serverdata;
1011                 }
1012
1013                 $data = json_decode($curlResult->getBody(), true);
1014                 if (empty($data)) {
1015                         return $serverdata;
1016                 }
1017
1018                 if (!empty($data['totalResults'])) {
1019                         $registeredUsers = $serverdata['registered-users'] ?? 0;
1020                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
1021                         $serverdata['directory-type'] = self::DT_POCO;
1022                         $serverdata['poco'] = $url . '/poco';
1023                 }
1024
1025                 return $serverdata;
1026         }
1027
1028         /**
1029          * Checks if the given server does have a Mastodon style directory endpoint.
1030          *
1031          * @param string $url        URL of the given server
1032          * @param array  $serverdata array with server data
1033          *
1034          * @return array server data
1035          */
1036         public static function checkMastodonDirectory(string $url, array $serverdata)
1037         {
1038                 $curlResult = Network::curl($url . '/api/v1/directory?limit=1');
1039                 if (!$curlResult->isSuccess()) {
1040                         return $serverdata;
1041                 }
1042
1043                 $data = json_decode($curlResult->getBody(), true);
1044                 if (empty($data)) {
1045                         return $serverdata;
1046                 }
1047
1048                 if (count($data) == 1) {
1049                         $serverdata['directory-type'] = self::DT_MASTODON;
1050                 }
1051
1052                 return $serverdata;
1053         }
1054
1055         /**
1056          * Detects the version number of a given server when it was a NextCloud installation
1057          *
1058          * @param string $url        URL of the given server
1059          * @param array  $serverdata array with server data
1060          *
1061          * @return array server data
1062          */
1063         private static function detectNextcloud(string $url, array $serverdata)
1064         {
1065                 $curlResult = Network::curl($url . '/status.php');
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                 $curlResult = Network::curl($url . '/api/v1/instance');
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                 $curlResult = Network::curl($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                 $curlResult = Network::curl($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                 $curlResult = Network::curl($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                 $curlResult = Network::curl($url . '/friendica/json');
1316                 if (!$curlResult->isSuccess()) {
1317                         $curlResult = Network::curl($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 the user directory of a given gserver record
1556          *
1557          * @param array $gserver gserver record
1558          */
1559         public static function updateDirectory(array $gserver)
1560         {
1561                 /// @todo Add Mastodon API directory
1562
1563                 if (!empty($gserver['poco'])) {
1564                         PortableContact::discoverSingleServer($gserver['id']);
1565                 }
1566         }
1567
1568         /**
1569          * Update GServer entries
1570          */
1571         public static function discover()
1572         {
1573                 // Update the server list
1574                 self::discoverFederation();
1575
1576                 $no_of_queries = 5;
1577
1578                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1579
1580                 if ($requery_days == 0) {
1581                         $requery_days = 7;
1582                 }
1583
1584                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1585
1586                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`
1587                         FROM `gserver`
1588                         WHERE `last_contact` >= `last_failure`
1589                         AND `poco` != ''
1590                         AND `last_poco_query` < ?
1591                         ORDER BY RAND()", $last_update
1592                 );
1593
1594                 while ($gserver = DBA::fetch($gservers)) {
1595                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1596                                 // The server is not reachable? Okay, then we will try it later
1597                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1598                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1599                                 continue;
1600                         }
1601
1602                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1603                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1604
1605                         if (--$no_of_queries == 0) {
1606                                 break;
1607                         }
1608                 }
1609
1610                 DBA::close($gservers);
1611         }
1612
1613         /**
1614          * Discover federated servers
1615          */
1616         private static function discoverFederation()
1617         {
1618                 $last = DI::config()->get('poco', 'last_federation_discovery');
1619
1620                 if ($last) {
1621                         $next = $last + (24 * 60 * 60);
1622
1623                         if ($next > time()) {
1624                                 return;
1625                         }
1626                 }
1627
1628                 // Discover federated servers
1629                 $protocols = ['activitypub', 'diaspora', 'dfrn', 'ostatus'];
1630                 foreach ($protocols as $protocol) {
1631                         $query = '{nodes(protocol:"' . $protocol . '"){host}}';
1632                         $curlResult = Network::fetchUrl('https://the-federation.info/graphql?query=' . urlencode($query));
1633                         if (!empty($curlResult)) {
1634                                 $data = json_decode($curlResult, true);
1635                                 if (!empty($data['data']['nodes'])) {
1636                                         foreach ($data['data']['nodes'] as $server) {
1637                                                 // Using "only_nodeinfo" since servers that are listed on that page should always have it.
1638                                                 echo $server['host']."\n";
1639                                                 Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host'], true);
1640                                         }
1641                                 }
1642                         }
1643                 }
1644
1645                 // Disvover Mastodon servers
1646                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1647
1648                 if (!empty($accesstoken)) {
1649                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1650                         $header = ['Authorization: Bearer '.$accesstoken];
1651                         $curlResult = Network::curl($api, false, ['headers' => $header]);
1652                         if ($curlResult->isSuccess()) {
1653                                 $servers = json_decode($curlResult->getBody(), true);
1654
1655                                 foreach ($servers['instances'] as $server) {
1656                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1657                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1658                                 }
1659                         }
1660                 }
1661
1662                 DI::config()->set('poco', 'last_federation_discovery', time());
1663         }
1664 }