src/Model/GServer.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/GServer.php
   5  * This file includes the GServer class to handle with servers
   6  */
   7 namespace Friendica\Model;
   8
   9 use DOMDocument;
  10 use DOMXPath;
  11 use Friendica\Core\Config;
  12 use Friendica\Core\Protocol;
  13 use Friendica\Database\DBA;
  14 use Friendica\Module\Register;
  15 use Friendica\Network\CurlResult;
  16 use Friendica\Util\Network;
  17 use Friendica\Util\DateTimeFormat;
  18 use Friendica\Util\Strings;
  19 use Friendica\Util\XML;
  20 use Friendica\Core\Logger;
  21 use Friendica\Protocol\PortableContact;
  22 use Friendica\Protocol\Diaspora;
  23 use Friendica\Network\Probe;
  24
  25 /**
  26  * This class handles GServer related functions
  27  */
  28 class GServer
  29 {
  30         // Directory types
  31         const DT_NONE = 0;
  32         const DT_POCO = 1;
  33         const DT_MASTODON = 2;
  34         /**
  35          * Checks if the given server is reachable
  36          *
  37          * @param string  $profile URL of the given profile
  38          * @param string  $server  URL of the given server (If empty, taken from profile)
  39          * @param string  $network Network value that is used, when detection failed
  40          * @param boolean $force   Force an update.
  41          *
  42          * @return boolean 'true' if server seems vital
  43          */
  44         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
  45         {
  46                 if ($server == '') {
  47                         $server = GContact::getBasepath($profile);
  48                 }
  49
  50                 if ($server == '') {
  51                         return true;
  52                 }
  53
  54                 return self::check($server, $network, $force);
  55         }
  56
  57         /**
  58          * Decides if a server needs to be updated, based upon several date fields
  59          *
  60          * @param date $created      Creation date of that server entry
  61          * @param date $updated      When had the server entry be updated
  62          * @param date $last_failure Last failure when contacting that server
  63          * @param date $last_contact Last time the server had been contacted
  64          *
  65          * @return boolean Does the server record needs an update?
  66          */
  67         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
  68         {
  69                 $now = strtotime(DateTimeFormat::utcNow());
  70
  71                 if ($updated > $last_contact) {
  72                         $contact_time = strtotime($updated);
  73                 } else {
  74                         $contact_time = strtotime($last_contact);
  75                 }
  76
  77                 $failure_time = strtotime($last_failure);
  78                 $created_time = strtotime($created);
  79
  80                 // If there is no "created" time then use the current time
  81                 if ($created_time <= 0) {
  82                         $created_time = $now;
  83                 }
  84
  85                 // If the last contact was less than 24 hours then don't update
  86                 if (($now - $contact_time) < (60 * 60 * 24)) {
  87                         return false;
  88                 }
  89
  90                 // If the last failure was less than 24 hours then don't update
  91                 if (($now - $failure_time) < (60 * 60 * 24)) {
  92                         return false;
  93                 }
  94
  95                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
  96                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
  97                 //      return false;
  98
  99                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 100                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 101                         return false;
 102                 }
 103
 104                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 105                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 106                         return false;
 107                 }
 108
 109                 return true;
 110         }
 111
 112         /**
 113          * Checks the state of the given server.
 114          *
 115          * @param string  $server_url URL of the given server
 116          * @param string  $network    Network value that is used, when detection failed
 117          * @param boolean $force      Force an update.
 118          *
 119          * @return boolean 'true' if server seems vital
 120          */
 121         public static function check(string $server_url, string $network = '', bool $force = false)
 122         {
 123                 // Unify the server address
 124                 $server_url = trim($server_url, '/');
 125                 $server_url = str_replace('/index.php', '', $server_url);
 126
 127                 if ($server_url == '') {
 128                         return false;
 129                 }
 130
 131                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 132                 if (DBA::isResult($gserver)) {
 133                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 134                                 $fields = ['created' => DateTimeFormat::utcNow()];
 135                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 136                                 DBA::update('gserver', $fields, $condition);
 137                         }
 138
 139                         $last_contact = $gserver['last_contact'];
 140                         $last_failure = $gserver['last_failure'];
 141
 142                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 143                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 144                         if ($last_contact < DBA::NULL_DATETIME) {
 145                                 $last_contact = DBA::NULL_DATETIME;
 146                         }
 147
 148                         if ($last_failure < DBA::NULL_DATETIME) {
 149                                 $last_failure = DBA::NULL_DATETIME;
 150                         }
 151
 152                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 153                                 Logger::info('No update needed', ['server' => $server_url]);
 154                                 return ($last_contact >= $last_failure);
 155                         }
 156                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 157                 } else {
 158                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 159                 }
 160
 161                 return self::detect($server_url, $network);
 162         }
 163
 164         /**
 165          * Detect server data (type, protocol, version number, ...)
 166          * The detected data is then updated or inserted in the gserver table.
 167          *
 168          * @param string  $url     URL of the given server
 169          * @param string  $network Network value that is used, when detection failed
 170          *
 171          * @return boolean 'true' if server could be detected
 172          */
 173         public static function detect(string $url, string $network = '')
 174         {
 175                 Logger::info('Detect server type', ['server' => $url]);
 176                 $serverdata = [];
 177
 178                 $original_url = $url;
 179
 180                 // Remove URL content that is not supposed to exist for a server url
 181                 $urlparts = parse_url($url);
 182                 unset($urlparts['user']);
 183                 unset($urlparts['pass']);
 184                 unset($urlparts['query']);
 185                 unset($urlparts['fragment']);
 186                 $url = Network::unparseURL($urlparts);
 187
 188                 // If the URL missmatches, then we mark the old entry as failure
 189                 if ($url != $original_url) {
 190                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($original_url)]);
 191                 }
 192
 193                 // When a nodeinfo is present, we don't need to dig further
 194                 $xrd_timeout = Config::get('system', 'xrd_timeout');
 195                 $curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 196                 if ($curlResult->isTimeout()) {
 197                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 198                         return false;
 199                 }
 200
 201                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 202
 203                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 204                 if (empty($nodeinfo)) {
 205                         $nodeinfo = self::fetchStatistics($url);
 206                 }
 207
 208                 // If that didn't work out well, we use some protocol specific endpoints
 209                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 210                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 211                         // Fetch the landing page, possibly it reveals some data
 212                         if (empty($nodeinfo['network'])) {
 213                                 $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 214                                 if ($curlResult->isSuccess()) {
 215                                         $serverdata = self::analyseRootHeader($curlResult, $serverdata);
 216                                         $serverdata = self::analyseRootBody($curlResult, $serverdata, $url);
 217                                 }
 218
 219                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
 220                                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 221                                         return false;
 222                                 }
 223                         }
 224
 225                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 226                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 227                         }
 228
 229                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 230                         // With this check we don't have to waste time and ressources for dead systems.
 231                         // Also this hopefully prevents us from receiving abuse messages.
 232                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 233                                 DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 234                                 return false;
 235                         }
 236
 237                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 238                                 $serverdata = self::detectFriendica($url, $serverdata);
 239                         }
 240
 241                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 242                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 243                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 244                         }
 245
 246                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 247                         if (empty($serverdata['network'])) {
 248                                 $serverdata = self::detectHubzilla($url, $serverdata);
 249                         }
 250
 251                         if (empty($serverdata['network'])) {
 252                                 $serverdata = self::detectNextcloud($url, $serverdata);
 253                         }
 254
 255                         if (empty($serverdata['network'])) {
 256                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 257                         }
 258                 } else {
 259                         $serverdata = $nodeinfo;
 260                 }
 261
 262                 // Detect the directory type
 263                 $serverdata['directory-type'] = self::DT_NONE;
 264                 $serverdata = self::checkPoCo($url, $serverdata);
 265                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 266
 267                 // We can't detect the network type. Possibly it is some system that we don't know yet
 268                 if (empty($serverdata['network'])) {
 269                         $serverdata['network'] = Protocol::PHANTOM;
 270                 }
 271
 272                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 273                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 274                         $serverdata['network'] = $network;
 275                 }
 276
 277                 $serverdata['url'] = $url;
 278                 $serverdata['nurl'] = Strings::normaliseLink($url);
 279
 280                 // We take the highest number that we do find
 281                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 282
 283                 // On an active server there has to be at least a single user
 284                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 285                         $registeredUsers = 1;
 286                 }
 287
 288                 if ($serverdata['network'] != Protocol::PHANTOM) {
 289                         $gcontacts = DBA::count('gcontact', ['server_url' => [$url, $serverdata['nurl']]]);
 290                         $apcontacts = DBA::count('apcontact', ['baseurl' => [$url, $serverdata['nurl']]]);
 291                         $contacts = DBA::count('contact', ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 292                         $serverdata['registered-users'] = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 293                 } else {
 294                         $serverdata['registered-users'] = $registeredUsers;
 295                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 296                 }
 297
 298                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 299
 300                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 301                 if (!DBA::isResult($gserver)) {
 302                         $serverdata['created'] = DateTimeFormat::utcNow();
 303                         $ret = DBA::insert('gserver', $serverdata);
 304                 } else {
 305                         // Don't override the network with 'unknown' when there had been a valid entry before
 306                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 307                                 unset($serverdata['network']);
 308                         }
 309
 310                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 311                 }
 312
 313                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 314                         self::discoverRelay($url);
 315                 }
 316
 317                 return $ret;
 318         }
 319
 320         /**
 321          * Fetch relay data from a given server url
 322          *
 323          * @param string $server_url address of the server
 324          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 325          */
 326         private static function discoverRelay(string $server_url)
 327         {
 328                 Logger::info('Discover relay data', ['server' => $server_url]);
 329
 330                 $curlResult = Network::curl($server_url . '/.well-known/x-social-relay');
 331                 if (!$curlResult->isSuccess()) {
 332                         return;
 333                 }
 334
 335                 $data = json_decode($curlResult->getBody(), true);
 336                 if (!is_array($data)) {
 337                         return;
 338                 }
 339
 340                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 341                 if (!DBA::isResult($gserver)) {
 342                         return;
 343                 }
 344
 345                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 346                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 347                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 348                 }
 349
 350                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 351
 352                 if ($data['scope'] == 'tags') {
 353                         // Avoid duplicates
 354                         $tags = [];
 355                         foreach ($data['tags'] as $tag) {
 356                                 $tag = mb_strtolower($tag);
 357                                 if (strlen($tag) < 100) {
 358                                         $tags[$tag] = $tag;
 359                                 }
 360                         }
 361
 362                         foreach ($tags as $tag) {
 363                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 364                         }
 365                 }
 366
 367                 // Create or update the relay contact
 368                 $fields = [];
 369                 if (isset($data['protocols'])) {
 370                         if (isset($data['protocols']['diaspora'])) {
 371                                 $fields['network'] = Protocol::DIASPORA;
 372
 373                                 if (isset($data['protocols']['diaspora']['receive'])) {
 374                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 375                                 } elseif (is_string($data['protocols']['diaspora'])) {
 376                                         $fields['batch'] = $data['protocols']['diaspora'];
 377                                 }
 378                         }
 379
 380                         if (isset($data['protocols']['dfrn'])) {
 381                                 $fields['network'] = Protocol::DFRN;
 382
 383                                 if (isset($data['protocols']['dfrn']['receive'])) {
 384                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 385                                 } elseif (is_string($data['protocols']['dfrn'])) {
 386                                         $fields['batch'] = $data['protocols']['dfrn'];
 387                                 }
 388                         }
 389                 }
 390                 Diaspora::setRelayContact($server_url, $fields);
 391         }
 392
 393         /**
 394          * Fetch server data from '/statistics.json' on the given server
 395          *
 396          * @param string $url URL of the given server
 397          *
 398          * @return array server data
 399          */
 400         private static function fetchStatistics(string $url)
 401         {
 402                 $curlResult = Network::curl($url . '/statistics.json');
 403                 if (!$curlResult->isSuccess()) {
 404                         return [];
 405                 }
 406
 407                 $data = json_decode($curlResult->getBody(), true);
 408                 if (empty($data)) {
 409                         return [];
 410                 }
 411
 412                 $serverdata = [];
 413
 414                 if (!empty($data['version'])) {
 415                         $serverdata['version'] = $data['version'];
 416                         // Version numbers on statistics.json are presented with additional info, e.g.:
 417                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 418                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 419                 }
 420
 421                 if (!empty($data['name'])) {
 422                         $serverdata['site_name'] = $data['name'];
 423                 }
 424
 425                 if (!empty($data['network'])) {
 426                         $serverdata['platform'] = $data['network'];
 427
 428                         if ($serverdata['platform'] == 'Diaspora') {
 429                                 $serverdata['network'] = Protocol::DIASPORA;
 430                         } elseif ($serverdata['platform'] == 'Friendica') {
 431                                 $serverdata['network'] = Protocol::DFRN;
 432                         } elseif ($serverdata['platform'] == 'hubzilla') {
 433                                 $serverdata['network'] = Protocol::ZOT;
 434                         } elseif ($serverdata['platform'] == 'redmatrix') {
 435                                 $serverdata['network'] = Protocol::ZOT;
 436                         }
 437                 }
 438
 439
 440                 if (!empty($data['registrations_open'])) {
 441                         $serverdata['register_policy'] = Register::OPEN;
 442                 } else {
 443                         $serverdata['register_policy'] = Register::CLOSED;
 444                 }
 445
 446                 return $serverdata;
 447         }
 448
 449         /**
 450          * Detect server type by using the nodeinfo data
 451          *
 452          * @param string     $url        address of the server
 453          * @param CurlResult $curlResult
 454          * @return array Server data
 455          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 456          */
 457         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 458         {
 459                 $nodeinfo = json_decode($curlResult->getBody(), true);
 460
 461                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 462                         return [];
 463                 }
 464
 465                 $nodeinfo1_url = '';
 466                 $nodeinfo2_url = '';
 467
 468                 foreach ($nodeinfo['links'] as $link) {
 469                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 470                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 471                                 continue;
 472                         }
 473                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 474                                 $nodeinfo1_url = $link['href'];
 475                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 476                                 $nodeinfo2_url = $link['href'];
 477                         }
 478                 }
 479
 480                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 481                         return [];
 482                 }
 483
 484                 $server = [];
 485
 486                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 487                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 488                         $server = self::parseNodeinfo2($nodeinfo2_url);
 489                 }
 490
 491                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 492                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 493                         $server = self::parseNodeinfo1($nodeinfo1_url);
 494                 }
 495
 496                 return $server;
 497         }
 498
 499         /**
 500          * Parses Nodeinfo 1
 501          *
 502          * @param string $nodeinfo_url address of the nodeinfo path
 503          * @return array Server data
 504          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 505          */
 506         private static function parseNodeinfo1(string $nodeinfo_url)
 507         {
 508                 $curlResult = Network::curl($nodeinfo_url);
 509
 510                 if (!$curlResult->isSuccess()) {
 511                         return [];
 512                 }
 513
 514                 $nodeinfo = json_decode($curlResult->getBody(), true);
 515
 516                 if (!is_array($nodeinfo)) {
 517                         return [];
 518                 }
 519
 520                 $server = [];
 521
 522                 $server['register_policy'] = Register::CLOSED;
 523
 524                 if (!empty($nodeinfo['openRegistrations'])) {
 525                         $server['register_policy'] = Register::OPEN;
 526                 }
 527
 528                 if (is_array($nodeinfo['software'])) {
 529                         if (!empty($nodeinfo['software']['name'])) {
 530                                 $server['platform'] = $nodeinfo['software']['name'];
 531                         }
 532
 533                         if (!empty($nodeinfo['software']['version'])) {
 534                                 $server['version'] = $nodeinfo['software']['version'];
 535                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 536                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 537                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 538                         }
 539                 }
 540
 541                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 542                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 543                 }
 544
 545                 if (!empty($nodeinfo['usage']['users']['total'])) {
 546                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 547                 }
 548
 549                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 550                         $protocols = [];
 551                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 552                                 $protocols[$protocol] = true;
 553                         }
 554
 555                         if (!empty($protocols['friendica'])) {
 556                                 $server['network'] = Protocol::DFRN;
 557                         } elseif (!empty($protocols['activitypub'])) {
 558                                 $server['network'] = Protocol::ACTIVITYPUB;
 559                         } elseif (!empty($protocols['diaspora'])) {
 560                                 $server['network'] = Protocol::DIASPORA;
 561                         } elseif (!empty($protocols['ostatus'])) {
 562                                 $server['network'] = Protocol::OSTATUS;
 563                         } elseif (!empty($protocols['gnusocial'])) {
 564                                 $server['network'] = Protocol::OSTATUS;
 565                         } elseif (!empty($protocols['zot'])) {
 566                                 $server['network'] = Protocol::ZOT;
 567                         }
 568                 }
 569
 570                 if (empty($server)) {
 571                         return [];
 572                 }
 573
 574                 return $server;
 575         }
 576
 577         /**
 578          * Parses Nodeinfo 2
 579          *
 580          * @param string $nodeinfo_url address of the nodeinfo path
 581          * @return array Server data
 582          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 583          */
 584         private static function parseNodeinfo2(string $nodeinfo_url)
 585         {
 586                 $curlResult = Network::curl($nodeinfo_url);
 587                 if (!$curlResult->isSuccess()) {
 588                         return [];
 589                 }
 590
 591                 $nodeinfo = json_decode($curlResult->getBody(), true);
 592
 593                 if (!is_array($nodeinfo)) {
 594                         return [];
 595                 }
 596
 597                 $server = [];
 598
 599                 $server['register_policy'] = Register::CLOSED;
 600
 601                 if (!empty($nodeinfo['openRegistrations'])) {
 602                         $server['register_policy'] = Register::OPEN;
 603                 }
 604
 605                 if (is_array($nodeinfo['software'])) {
 606                         if (!empty($nodeinfo['software']['name'])) {
 607                                 $server['platform'] = $nodeinfo['software']['name'];
 608                         }
 609
 610                         if (!empty($nodeinfo['software']['version'])) {
 611                                 $server['version'] = $nodeinfo['software']['version'];
 612                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 613                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 614                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 615                         }
 616                 }
 617
 618                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 619                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 620                 }
 621
 622                 if (!empty($nodeinfo['usage']['users']['total'])) {
 623                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 624                 }
 625
 626                 if (!empty($nodeinfo['protocols'])) {
 627                         $protocols = [];
 628                         foreach ($nodeinfo['protocols'] as $protocol) {
 629                                 $protocols[$protocol] = true;
 630                         }
 631
 632                         if (!empty($protocols['dfrn'])) {
 633                                 $server['network'] = Protocol::DFRN;
 634                         } elseif (!empty($protocols['activitypub'])) {
 635                                 $server['network'] = Protocol::ACTIVITYPUB;
 636                         } elseif (!empty($protocols['diaspora'])) {
 637                                 $server['network'] = Protocol::DIASPORA;
 638                         } elseif (!empty($protocols['ostatus'])) {
 639                                 $server['network'] = Protocol::OSTATUS;
 640                         } elseif (!empty($protocols['gnusocial'])) {
 641                                 $server['network'] = Protocol::OSTATUS;
 642                         } elseif (!empty($protocols['zot'])) {
 643                                 $server['network'] = Protocol::ZOT;
 644                         }
 645                 }
 646
 647                 if (empty($server)) {
 648                         return [];
 649                 }
 650
 651                 return $server;
 652         }
 653
 654         /**
 655          * Fetch server information from a 'siteinfo.json' file on the given server
 656          *
 657          * @param string $url        URL of the given server
 658          * @param array  $serverdata array with server data
 659          *
 660          * @return array server data
 661          */
 662         private static function fetchSiteinfo(string $url, array $serverdata)
 663         {
 664                 $curlResult = Network::curl($url . '/siteinfo.json');
 665                 if (!$curlResult->isSuccess()) {
 666                         return $serverdata;
 667                 }
 668
 669                 $data = json_decode($curlResult->getBody(), true);
 670                 if (empty($data)) {
 671                         return $serverdata;
 672                 }
 673
 674                 if (!empty($data['url'])) {
 675                         $serverdata['platform'] = $data['platform'];
 676                         $serverdata['version'] = $data['version'];
 677                 }
 678
 679                 if (!empty($data['plugins'])) {
 680                         if (in_array('pubcrawl', $data['plugins'])) {
 681                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 682                         } elseif (in_array('diaspora', $data['plugins'])) {
 683                                 $serverdata['network'] = Protocol::DIASPORA;
 684                         } elseif (in_array('gnusoc', $data['plugins'])) {
 685                                 $serverdata['network'] = Protocol::OSTATUS;
 686                         } else {
 687                                 $serverdata['network'] = Protocol::ZOT;
 688                         }
 689                 }
 690
 691                 if (!empty($data['site_name'])) {
 692                         $serverdata['site_name'] = $data['site_name'];
 693                 }
 694
 695                 if (!empty($data['channels_total'])) {
 696                         $serverdata['registered-users'] = $data['channels_total'];
 697                 }
 698
 699                 if (!empty($data['register_policy'])) {
 700                         switch ($data['register_policy']) {
 701                                 case 'REGISTER_OPEN':
 702                                         $serverdata['register_policy'] = Register::OPEN;
 703                                         break;
 704
 705                                 case 'REGISTER_APPROVE':
 706                                         $serverdata['register_policy'] = Register::APPROVE;
 707                                         break;
 708
 709                                 case 'REGISTER_CLOSED':
 710                                 default:
 711                                         $serverdata['register_policy'] = Register::CLOSED;
 712                                         break;
 713                         }
 714                 }
 715
 716                 return $serverdata;
 717         }
 718
 719         /**
 720          * Checks if the server contains a valid host meta file
 721          *
 722          * @param string $url URL of the given server
 723          *
 724          * @return boolean 'true' if the server seems to be vital
 725          */
 726         private static function validHostMeta(string $url)
 727         {
 728                 $xrd_timeout = Config::get('system', 'xrd_timeout');
 729                 $curlResult = Network::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 730                 if (!$curlResult->isSuccess()) {
 731                         return false;
 732                 }
 733
 734                 $xrd = XML::parseString($curlResult->getBody(), false);
 735                 if (!is_object($xrd)) {
 736                         return false;
 737                 }
 738
 739                 $elements = XML::elementToArray($xrd);
 740                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 741                         return false;
 742                 }
 743
 744                 $valid = false;
 745                 foreach ($elements['xrd']['link'] as $link) {
 746                         // When there is more than a single "link" element, the array looks slightly different
 747                         if (!empty($link['@attributes'])) {
 748                                 $link = $link['@attributes'];
 749                         }
 750
 751                         if (empty($link['rel']) || empty($link['template'])) {
 752                                 continue;
 753                         }
 754
 755                         if ($link['rel'] == 'lrdd') {
 756                                 // When the webfinger host is the same like the system host, it should be ok.
 757                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 758                         }
 759                 }
 760
 761                 return $valid;
 762         }
 763
 764         /**
 765          * Detect the network of the given server via their known contacts
 766          *
 767          * @param string $url        URL of the given server
 768          * @param array  $serverdata array with server data
 769          *
 770          * @return array server data
 771          */
 772         private static function detectNetworkViaContacts(string $url, array $serverdata)
 773         {
 774                 $contacts = [];
 775
 776                 $gcontacts = DBA::select('gcontact', ['url', 'nurl'], ['server_url' => [$url, $serverdata['nurl']]]);
 777                 while ($gcontact = DBA::fetch($gcontacts)) {
 778                         $contacts[$gcontact['nurl']] = $gcontact['url'];
 779                 }
 780                 DBA::close($gcontacts);
 781
 782                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 783                 while ($gcontact = DBA::fetch($gcontacts)) {
 784                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 785                 }
 786                 DBA::close($apcontacts);
 787
 788                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 789                 while ($gcontact = DBA::fetch($gcontacts)) {
 790                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 791                 }
 792                 DBA::close($pcontacts);
 793
 794                 if (empty($contacts)) {
 795                         return $serverdata;
 796                 }
 797
 798                 foreach ($contacts as $contact) {
 799                         $probed = Probe::uri($contact);
 800                         if (in_array($probed['network'], Protocol::FEDERATED)) {
 801                                 $serverdata['network'] = $probed['network'];
 802                                 break;
 803                         }
 804                 }
 805
 806                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 807
 808                 return $serverdata;
 809         }
 810
 811         /**
 812          * Checks if the given server does have a '/poco' endpoint.
 813          * This is used for the 'PortableContact' functionality,
 814          * which is used by both Friendica and Hubzilla.
 815          *
 816          * @param string $url        URL of the given server
 817          * @param array  $serverdata array with server data
 818          *
 819          * @return array server data
 820          */
 821         private static function checkPoCo(string $url, array $serverdata)
 822         {
 823                 $serverdata['poco'] = '';
 824
 825                 $curlResult = Network::curl($url. '/poco');
 826                 if (!$curlResult->isSuccess()) {
 827                         return $serverdata;
 828                 }
 829
 830                 $data = json_decode($curlResult->getBody(), true);
 831                 if (empty($data)) {
 832                         return $serverdata;
 833                 }
 834
 835                 if (!empty($data['totalResults'])) {
 836                         $registeredUsers = $serverdata['registered-users'] ?? 0;
 837                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
 838                         $serverdata['directory-type'] = self::DT_POCO;
 839                         $serverdata['poco'] = $url . '/poco';
 840                 }
 841
 842                 return $serverdata;
 843         }
 844
 845         /**
 846          * Checks if the given server does have a Mastodon style directory endpoint.
 847          *
 848          * @param string $url        URL of the given server
 849          * @param array  $serverdata array with server data
 850          *
 851          * @return array server data
 852          */
 853         public static function checkMastodonDirectory(string $url, array $serverdata)
 854         {
 855                 $curlResult = Network::curl($url . '/api/v1/directory?limit=1');
 856                 if (!$curlResult->isSuccess()) {
 857                         return $serverdata;
 858                 }
 859
 860                 $data = json_decode($curlResult->getBody(), true);
 861                 if (empty($data)) {
 862                         return $serverdata;
 863                 }
 864
 865                 if (count($data) == 1) {
 866                         $serverdata['directory-type'] = self::DT_MASTODON;
 867                 }
 868
 869                 return $serverdata;
 870         }
 871
 872         /**
 873          * Detects the version number of a given server when it was a NextCloud installation
 874          *
 875          * @param string $url        URL of the given server
 876          * @param array  $serverdata array with server data
 877          *
 878          * @return array server data
 879          */
 880         private static function detectNextcloud(string $url, array $serverdata)
 881         {
 882                 $curlResult = Network::curl($url . '/status.php');
 883
 884                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 885                         return $serverdata;
 886                 }
 887
 888                 $data = json_decode($curlResult->getBody(), true);
 889                 if (empty($data)) {
 890                         return $serverdata;
 891                 }
 892
 893                 if (!empty($data['version'])) {
 894                         $serverdata['platform'] = 'nextcloud';
 895                         $serverdata['version'] = $data['version'];
 896                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 897                 }
 898
 899                 return $serverdata;
 900         }
 901
 902         /**
 903          * Detects data from a given server url if it was a mastodon alike system
 904          *
 905          * @param string $url        URL of the given server
 906          * @param array  $serverdata array with server data
 907          *
 908          * @return array server data
 909          */
 910         private static function detectMastodonAlikes(string $url, array $serverdata)
 911         {
 912                 $curlResult = Network::curl($url . '/api/v1/instance');
 913
 914                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 915                         return $serverdata;
 916                 }
 917
 918                 $data = json_decode($curlResult->getBody(), true);
 919                 if (empty($data)) {
 920                         return $serverdata;
 921                 }
 922
 923                 if (!empty($data['version'])) {
 924                         $serverdata['platform'] = 'mastodon';
 925                         $serverdata['version'] = $data['version'] ?? '';
 926                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 927                 }
 928
 929                 if (!empty($data['title'])) {
 930                         $serverdata['site_name'] = $data['title'];
 931                 }
 932
 933                 if (!empty($data['description'])) {
 934                         $serverdata['info'] = trim($data['description']);
 935                 }
 936
 937                 if (!empty($data['stats']['user_count'])) {
 938                         $serverdata['registered-users'] = $data['stats']['user_count'];
 939                 }
 940
 941                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
 942                         $serverdata['platform'] = $matches[1];
 943                         $serverdata['version'] = $matches[2];
 944                 }
 945
 946                 if (!empty($serverdata['version']) && strstr($serverdata['version'], 'Pleroma')) {
 947                         $serverdata['platform'] = 'pleroma';
 948                         $serverdata['version'] = trim(str_replace('Pleroma', '', $serverdata['version']));
 949                 }
 950
 951                 return $serverdata;
 952         }
 953
 954         /**
 955          * Detects data from typical Hubzilla endpoints
 956          *
 957          * @param string $url        URL of the given server
 958          * @param array  $serverdata array with server data
 959          *
 960          * @return array server data
 961          */
 962         private static function detectHubzilla(string $url, array $serverdata)
 963         {
 964                 $curlResult = Network::curl($url . '/api/statusnet/config.json');
 965                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 966                         return $serverdata;
 967                 }
 968
 969                 $data = json_decode($curlResult->getBody(), true);
 970                 if (empty($data)) {
 971                         return $serverdata;
 972                 }
 973
 974                 if (!empty($data['site']['name'])) {
 975                         $serverdata['site_name'] = $data['site']['name'];
 976                 }
 977
 978                 if (!empty($data['site']['platform'])) {
 979                         $serverdata['platform'] = $data['site']['platform']['PLATFORM_NAME'];
 980                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
 981                         $serverdata['network'] = Protocol::ZOT;
 982                 }
 983
 984                 if (!empty($data['site']['hubzilla'])) {
 985                         $serverdata['platform'] = $data['site']['hubzilla']['PLATFORM_NAME'];
 986                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
 987                         $serverdata['network'] = Protocol::ZOT;
 988                 }
 989
 990                 if (!empty($data['site']['redmatrix'])) {
 991                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
 992                                 $serverdata['platform'] = $data['site']['redmatrix']['PLATFORM_NAME'];
 993                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
 994                                 $serverdata['platform'] = $data['site']['redmatrix']['RED_PLATFORM'];
 995                         }
 996
 997                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
 998                         $serverdata['network'] = Protocol::ZOT;
 999                 }
1000
1001                 $private = false;
1002                 $inviteonly = false;
1003                 $closed = false;
1004
1005                 if (!empty($data['site']['closed'])) {
1006                         $closed = self::toBoolean($data['site']['closed']);
1007                 }
1008
1009                 if (!empty($data['site']['private'])) {
1010                         $private = self::toBoolean($data['site']['private']);
1011                 }
1012
1013                 if (!empty($data['site']['inviteonly'])) {
1014                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1015                 }
1016
1017                 if (!$closed && !$private and $inviteonly) {
1018                         $register_policy = Register::APPROVE;
1019                 } elseif (!$closed && !$private) {
1020                         $register_policy = Register::OPEN;
1021                 } else {
1022                         $register_policy = Register::CLOSED;
1023                 }
1024
1025                 return $serverdata;
1026         }
1027
1028         /**
1029          * Converts input value to a boolean value
1030          *
1031          * @param string|integer $val
1032          *
1033          * @return boolean
1034          */
1035         private static function toBoolean($val)
1036         {
1037                 if (($val == 'true') || ($val == 1)) {
1038                         return true;
1039                 } elseif (($val == 'false') || ($val == 0)) {
1040                         return false;
1041                 }
1042
1043                 return $val;
1044         }
1045
1046         /**
1047          * Detect if the URL belongs to a GNU Social server
1048          *
1049          * @param string $url        URL of the given server
1050          * @param array  $serverdata array with server data
1051          *
1052          * @return array server data
1053          */
1054         private static function detectGNUSocial(string $url, array $serverdata)
1055         {
1056                 // Test for GNU Social
1057                 $curlResult = Network::curl($url . '/api/gnusocial/version.json');
1058                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1059                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1060                         $serverdata['platform'] = 'gnusocial';
1061                         // Remove junk that some GNU Social servers return
1062                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1063                         $serverdata['version'] = trim($serverdata['version'], '"');
1064                         $serverdata['network'] = Protocol::OSTATUS;
1065                         return $serverdata;
1066                 }
1067
1068                 // Test for Statusnet
1069                 $curlResult = Network::curl($url . '/api/statusnet/version.json');
1070                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1071                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1072                         $serverdata['platform'] = 'statusnet';
1073                         // Remove junk that some GNU Social servers return
1074                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1075                         $serverdata['version'] = trim($serverdata['version'], '"');
1076                         $serverdata['network'] = Protocol::OSTATUS;
1077                 }
1078
1079                 return $serverdata;
1080         }
1081
1082         /**
1083          * Detect if the URL belongs to a Friendica server
1084          *
1085          * @param string $url        URL of the given server
1086          * @param array  $serverdata array with server data
1087          *
1088          * @return array server data
1089          */
1090         private static function detectFriendica(string $url, array $serverdata)
1091         {
1092                 $curlResult = Network::curl($url . '/friendica/json');
1093                 if (!$curlResult->isSuccess()) {
1094                         $curlResult = Network::curl($url . '/friendika/json');
1095                 }
1096
1097                 if (!$curlResult->isSuccess()) {
1098                         return $serverdata;
1099                 }
1100
1101                 $data = json_decode($curlResult->getBody(), true);
1102                 if (empty($data) || empty($data['version'])) {
1103                         return $serverdata;
1104                 }
1105
1106                 $serverdata['network'] = Protocol::DFRN;
1107                 $serverdata['version'] = $data['version'];
1108
1109                 if (!empty($data['no_scrape_url'])) {
1110                         $serverdata['noscrape'] = $data['no_scrape_url'];
1111                 }
1112
1113                 if (!empty($data['site_name'])) {
1114                         $serverdata['site_name'] = $data['site_name'];
1115                 }
1116
1117                 if (!empty($data['info'])) {
1118                         $serverdata['info'] = trim($data['info']);
1119                 }
1120
1121                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1122                 switch ($register_policy) {
1123                         case 'REGISTER_OPEN':
1124                                 $serverdata['register_policy'] = Register::OPEN;
1125                                 break;
1126
1127                         case 'REGISTER_APPROVE':
1128                                 $serverdata['register_policy'] = Register::APPROVE;
1129                                 break;
1130
1131                         case 'REGISTER_CLOSED':
1132                         case 'REGISTER_INVITATION':
1133                                 $serverdata['register_policy'] = Register::CLOSED;
1134                                 break;
1135                         default:
1136                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1137                                 $serverdata['register_policy'] = Register::CLOSED;
1138                                 break;
1139                 }
1140
1141                 $serverdata['platform'] = $data['platform'] ?? '';
1142
1143                 return $serverdata;
1144         }
1145
1146         /**
1147          * Analyses the landing page of a given server for hints about type and system of that server
1148          *
1149          * @param object $curlResult result of curl execution
1150          * @param array  $serverdata array with server data
1151          * @param string $url        Server URL
1152          *
1153          * @return array server data
1154          */
1155         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1156         {
1157                 $doc = new DOMDocument();
1158                 @$doc->loadHTML($curlResult->getBody());
1159                 $xpath = new DOMXPath($doc);
1160
1161                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1162                 if (!empty($title)) {
1163                         $serverdata['site_name'] = $title;
1164                 }
1165
1166                 $list = $xpath->query('//meta[@name]');
1167
1168                 foreach ($list as $node) {
1169                         $attr = [];
1170                         if ($node->attributes->length) {
1171                                 foreach ($node->attributes as $attribute) {
1172                                         $value = trim($attribute->value);
1173                                         if (empty($value)) {
1174                                                 continue;
1175                                         }
1176
1177                                         $attr[$attribute->name] = $value;
1178                                 }
1179
1180                                 if (empty($attr['name']) || empty($attr['content'])) {
1181                                         continue;
1182                                 }
1183                         }
1184
1185                         if ($attr['name'] == 'description') {
1186                                 $serverdata['info'] = $attr['content'];
1187                         }
1188
1189                         if ($attr['name'] == 'application-name') {
1190                                 $serverdata['platform'] = $attr['content'];
1191                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1192                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1193                                 }
1194                         }
1195
1196                         if ($attr['name'] == 'generator') {
1197                                 $serverdata['platform'] = $attr['content'];
1198
1199                                 $version_part = explode(' ', $attr['content']);
1200
1201                                 if (count($version_part) == 2) {
1202                                         if (in_array($version_part[0], ['WordPress'])) {
1203                                                 $serverdata['platform'] = $version_part[0];
1204                                                 $serverdata['version'] = $version_part[1];
1205
1206                                                 // We still do need a reliable test if some AP plugin is activated
1207                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1208                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1209                                                 } else {
1210                                                         $serverdata['network'] = Protocol::FEED;
1211                                                 }
1212                                         }
1213                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1214                                                 $serverdata['platform'] = $version_part[0];
1215                                                 $serverdata['version'] = $version_part[1];
1216                                                 $serverdata['network'] = Protocol::DFRN;
1217                                         }
1218                                 }
1219                         }
1220                 }
1221
1222                 $list = $xpath->query('//meta[@property]');
1223
1224                 foreach ($list as $node) {
1225                         $attr = [];
1226                         if ($node->attributes->length) {
1227                                 foreach ($node->attributes as $attribute) {
1228                                         $value = trim($attribute->value);
1229                                         if (empty($value)) {
1230                                                 continue;
1231                                         }
1232
1233                                         $attr[$attribute->name] = $value;
1234                                 }
1235
1236                                 if (empty($attr['property']) || empty($attr['content'])) {
1237                                         continue;
1238                                 }
1239                         }
1240
1241                         if ($attr['property'] == 'og:site_name') {
1242                                 $serverdata['site_name'] = $attr['content'];
1243                         }
1244
1245                         if ($attr['property'] == 'og:description') {
1246                                 $serverdata['info'] = $attr['content'];
1247                         }
1248
1249                         if ($attr['property'] == 'og:platform') {
1250                                 $serverdata['platform'] = $attr['content'];
1251
1252                                 if (in_array($attr['content'], ['PeerTube'])) {
1253                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1254                                 }
1255                         }
1256
1257                         if ($attr['property'] == 'generator') {
1258                                 $serverdata['platform'] = $attr['content'];
1259
1260                                 if (in_array($attr['content'], ['hubzilla'])) {
1261                                         // We later check which compatible protocol modules are loaded.
1262                                         $serverdata['network'] = Protocol::ZOT;
1263                                 }
1264                         }
1265                 }
1266
1267                 return $serverdata;
1268         }
1269
1270         /**
1271          * Analyses the header data of a given server for hints about type and system of that server
1272          *
1273          * @param object $curlResult result of curl execution
1274          * @param array  $serverdata array with server data
1275          *
1276          * @return array server data
1277          */
1278         private static function analyseRootHeader($curlResult, array $serverdata)
1279         {
1280                 if ($curlResult->getHeader('server') == 'Mastodon') {
1281                         $serverdata['platform'] = 'mastodon';
1282                         $serverdata['network'] = $network = Protocol::ACTIVITYPUB;
1283                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1284                         $serverdata['platform'] = 'diaspora';
1285                         $serverdata['network'] = $network = Protocol::DIASPORA;
1286                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1287
1288                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1289                         $serverdata['platform'] = 'friendica';
1290                         $serverdata['network'] = $network = Protocol::DFRN;
1291                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1292                 }
1293                 return $serverdata;
1294         }
1295
1296         /**
1297          * Update the user directory of a given gserver record
1298          *
1299          * @param array $gserver gserver record
1300          */
1301         public static function updateDirectory(array $gserver)
1302         {
1303                 /// @todo Add Mastodon API directory
1304
1305                 if (!empty($gserver['poco'])) {
1306                         PortableContact::discoverSingleServer($gserver['id']);
1307                 }
1308         }
1309
1310         /**
1311          * Update GServer entries
1312          */
1313         public static function discover()
1314         {
1315                 // Update the server list
1316                 self::discoverFederation();
1317
1318                 $no_of_queries = 5;
1319
1320                 $requery_days = intval(Config::get('system', 'poco_requery_days'));
1321
1322                 if ($requery_days == 0) {
1323                         $requery_days = 7;
1324                 }
1325
1326                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1327
1328                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`
1329                         FROM `gserver`
1330                         WHERE `last_contact` >= `last_failure`
1331                         AND `poco` != ''
1332                         AND `last_poco_query` < ?
1333                         ORDER BY RAND()", $last_update
1334                 );
1335
1336                 while ($gserver = DBA::fetch($gservers)) {
1337                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1338                                 // The server is not reachable? Okay, then we will try it later
1339                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1340                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1341                                 continue;
1342                         }
1343
1344                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1345                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1346
1347                         if (--$no_of_queries == 0) {
1348                                 break;
1349                         }
1350                 }
1351
1352                 DBA::close($gservers);
1353         }
1354
1355         /**
1356          * Discover federated servers
1357          */
1358         private static function discoverFederation()
1359         {
1360                 $last = Config::get('poco', 'last_federation_discovery');
1361
1362                 if ($last) {
1363                         $next = $last + (24 * 60 * 60);
1364
1365                         if ($next > time()) {
1366                                 return;
1367                         }
1368                 }
1369
1370                 // Discover federated servers
1371                 $curlResult = Network::fetchUrl("http://the-federation.info/pods.json");
1372
1373                 if (!empty($curlResult)) {
1374                         $servers = json_decode($curlResult, true);
1375
1376                         if (!empty($servers['pods'])) {
1377                                 foreach ($servers['pods'] as $server) {
1378                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host']);
1379                                 }
1380                         }
1381                 }
1382
1383                 // Disvover Mastodon servers
1384                 $accesstoken = Config::get('system', 'instances_social_key');
1385
1386                 if (!empty($accesstoken)) {
1387                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1388                         $header = ['Authorization: Bearer '.$accesstoken];
1389                         $curlResult = Network::curl($api, false, ['headers' => $header]);
1390
1391                         if ($curlResult->isSuccess()) {
1392                                 $servers = json_decode($curlResult->getBody(), true);
1393
1394                                 foreach ($servers['instances'] as $server) {
1395                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1396                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1397                                 }
1398                         }
1399                 }
1400
1401                 Config::set('poco', 'last_federation_discovery', time());
1402         }
1403 }