src/Model/GServer.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/GServer.php
   5  * @brief 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\Util\Network;
  16 use Friendica\Util\DateTimeFormat;
  17 use Friendica\Util\Strings;
  18 use Friendica\Util\XML;
  19 use Friendica\Core\Logger;
  20 use Friendica\Protocol\PortableContact;
  21 use Friendica\Protocol\Diaspora;
  22
  23 /**
  24  * @brief This class handles GServer related functions
  25  */
  26 class GServer
  27 {
  28         public static function check($server_url, $force = false)
  29         {
  30                 // Unify the server address
  31                 $server_url = trim($server_url, '/');
  32                 $server_url = str_replace('/index.php', '', $server_url);
  33
  34                 if ($server_url == '') {
  35                         return false;
  36                 }
  37
  38                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
  39                 if (DBA::isResult($gserver)) {
  40                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
  41                                 $fields = ['created' => DateTimeFormat::utcNow()];
  42                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
  43                                 DBA::update('gserver', $fields, $condition);
  44                         }
  45
  46                         $last_contact = $gserver["last_contact"];
  47                         $last_failure = $gserver["last_failure"];
  48
  49                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
  50                         // It can happen that a zero date is in the database, but storing it again is forbidden.
  51                         if ($last_contact < DBA::NULL_DATETIME) {
  52                                 $last_contact = DBA::NULL_DATETIME;
  53                         }
  54
  55                         if ($last_failure < DBA::NULL_DATETIME) {
  56                                 $last_failure = DBA::NULL_DATETIME;
  57                         }
  58
  59                         if (!$force && !PortableContact::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
  60                                 Logger::info('Use cached data', ['server' => $server_url]);
  61                                 return ($last_contact >= $last_failure);
  62                         }
  63                 }
  64                 Logger::info('Server is outdated or unknown. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
  65
  66                 return self::detect($server_url);
  67         }
  68
  69         /**
  70          * Detect server data (type, protocol, version number, ...)
  71          * The detected data is then updated or inserted in the gserver table.
  72          *
  73          * @param string $url Server url
  74          *
  75          * @return boolean 'true' if server could be detected
  76          */
  77         public static function detect($url)
  78         {
  79                 $serverdata = [];
  80
  81                 // When a nodeinfo is present, we don't need to dig further
  82                 $xrd_timeout = Config::get('system', 'xrd_timeout');
  83                 $curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
  84                 if ($curlResult->isTimeout()) {
  85                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
  86                         return false;
  87                 }
  88
  89                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
  90
  91                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
  92                 if (empty($nodeinfo)) {
  93                         $nodeinfo = self::fetchStatistics($url);
  94                 }
  95
  96                 // If that didn't work out well, we use some protocol specific endpoints
  97                 if (empty($nodeinfo) || empty($nodeinfo['network']) || ($nodeinfo['network'] == Protocol::DFRN)) {
  98                         // Fetch the landing page, possibly it reveals some data
  99                         $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 100                         if ($curlResult->isSuccess()) {
 101                                 $serverdata = self::analyseRootHeader($curlResult, $serverdata);
 102                                 $serverdata = self::analyseRootBody($curlResult, $serverdata);
 103                         }
 104
 105                         if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
 106                                 DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 107                                 return false;
 108                         }
 109
 110                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::DFRN)) {
 111                                 $serverdata = self::detectFriendica($url, $serverdata);
 112                         }
 113
 114                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 115                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 116                         }
 117
 118                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 119                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 120                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 121                         }
 122
 123                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 124                         if (empty($serverdata['network'])) {
 125                                 $serverdata = self::detectHubzilla($url, $serverdata);
 126                         }
 127
 128                         if (empty($serverdata['network'])) {
 129                                 $serverdata = self::detectNextcloud($url, $serverdata);
 130                         }
 131
 132                         if (empty($serverdata['network'])) {
 133                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 134                         }
 135                 } else {
 136                         $serverdata = $nodeinfo;
 137                 }
 138
 139                 $serverdata = self::checkPoCo($url, $serverdata);
 140
 141                 // We can't detect the network type. Possibly it is some system that we don't know yet
 142                 if (empty($serverdata['network'])) {
 143                         $serverdata['network'] = Protocol::PHANTOM;
 144                 }
 145
 146                 // Check host-meta for phantom networks.
 147                 // Although this is not needed, it is a good indicator for a living system,
 148                 // since most systems had implemented it.
 149                 if (($serverdata['network'] == Protocol::PHANTOM) && !self::validHostMeta($url)) {
 150                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 151                         return false;
 152                 }
 153
 154                 $serverdata['url'] = $url;
 155                 $serverdata['nurl'] = Strings::normaliseLink($url);
 156
 157                 // We take the highest number that we do find
 158                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 159
 160                 // On an active server there has to be at least a single user
 161                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 162                         $registeredUsers = 1;
 163                 }
 164
 165                 $gcontacts = DBA::count('gcontact', ['server_url' => [$url, $serverdata['nurl']]]);
 166                 $apcontacts = DBA::count('apcontact', ['baseurl' => [$url, $serverdata['nurl']]]);
 167                 $contacts = DBA::count('contact', ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 168                 $serverdata['registered-users'] = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 169
 170                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 171
 172                 if (!DBA::exists('gserver', ['nurl' => Strings::normaliseLink($url)])) {
 173                         $serverdata['created'] = DateTimeFormat::utcNow();
 174                         $ret = DBA::insert('gserver', $serverdata);
 175                 } else {
 176                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 177                 }
 178
 179                 if (in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 180                         self::discoverRelay($url);
 181                 }
 182
 183                 return $ret;
 184         }
 185
 186         /**
 187          * @brief Fetch relay data from a given server url
 188          *
 189          * @param string $server_url address of the server
 190          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 191          */
 192         private static function discoverRelay($server_url)
 193         {
 194                 Logger::info('Discover relay data', ['server' => $server_url]);
 195
 196                 $curlResult = Network::curl($server_url . '/.well-known/x-social-relay');
 197                 if (!$curlResult->isSuccess()) {
 198                         return;
 199                 }
 200
 201                 $data = json_decode($curlResult->getBody(), true);
 202                 if (!is_array($data)) {
 203                         return;
 204                 }
 205
 206                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 207                 if (!DBA::isResult($gserver)) {
 208                         return;
 209                 }
 210
 211                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 212                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 213                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 214                 }
 215
 216                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 217
 218                 if ($data['scope'] == 'tags') {
 219                         // Avoid duplicates
 220                         $tags = [];
 221                         foreach ($data['tags'] as $tag) {
 222                                 $tag = mb_strtolower($tag);
 223                                 if (strlen($tag) < 100) {
 224                                         $tags[$tag] = $tag;
 225                                 }
 226                         }
 227
 228                         foreach ($tags as $tag) {
 229                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 230                         }
 231                 }
 232
 233                 // Create or update the relay contact
 234                 $fields = [];
 235                 if (isset($data['protocols'])) {
 236                         if (isset($data['protocols']['diaspora'])) {
 237                                 $fields['network'] = Protocol::DIASPORA;
 238
 239                                 if (isset($data['protocols']['diaspora']['receive'])) {
 240                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 241                                 } elseif (is_string($data['protocols']['diaspora'])) {
 242                                         $fields['batch'] = $data['protocols']['diaspora'];
 243                                 }
 244                         }
 245
 246                         if (isset($data['protocols']['dfrn'])) {
 247                                 $fields['network'] = Protocol::DFRN;
 248
 249                                 if (isset($data['protocols']['dfrn']['receive'])) {
 250                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 251                                 } elseif (is_string($data['protocols']['dfrn'])) {
 252                                         $fields['batch'] = $data['protocols']['dfrn'];
 253                                 }
 254                         }
 255                 }
 256                 Diaspora::setRelayContact($server_url, $fields);
 257         }
 258
 259         private static function fetchStatistics($url)
 260         {
 261                 $curlResult = Network::curl($url . '/statistics.json');
 262                 if (!$curlResult->isSuccess()) {
 263                         return [];
 264                 }
 265
 266                 $data = json_decode($curlResult->getBody(), true);
 267                 if (empty($data)) {
 268                         return [];
 269                 }
 270
 271                 $serverdata = [];
 272
 273                 if (!empty($data['version'])) {
 274                         $serverdata['version'] = $data['version'];
 275                         // Version numbers on statistics.json are presented with additional info, e.g.:
 276                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 277                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 278                 }
 279
 280                 if (!empty($data['name'])) {
 281                         $serverdata['site_name'] = $data['name'];
 282                 }
 283
 284                 if (!empty($data['network'])) {
 285                         $serverdata['platform'] = $data['network'];
 286
 287                         if ($serverdata['platform'] == 'Diaspora') {
 288                                 $serverdata['network'] = Protocol::DIASPORA;
 289                         } elseif ($serverdata['platform'] == 'Friendica') {
 290                                 $serverdata['network'] = Protocol::DFRN;
 291                         } elseif ($serverdata['platform'] == 'hubzilla') {
 292                                 $serverdata['network'] = Protocol::ZOT;
 293                         } elseif ($serverdata['platform'] == 'redmatrix') {
 294                                 $serverdata['network'] = Protocol::ZOT;
 295                         }
 296                 }
 297
 298
 299                 if (!empty($data['registrations_open'])) {
 300                         $serverdata['register_policy'] = Register::OPEN;
 301                 } else {
 302                         $serverdata['register_policy'] = Register::CLOSED;
 303                 }
 304
 305                 return $serverdata;
 306         }
 307
 308         /**
 309          * @brief Detect server type by using the nodeinfo data
 310          *
 311          * @param string $url address of the server
 312          * @return array Server data
 313          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 314          */
 315         private static function fetchNodeinfo($url, $curlResult)
 316         {
 317                 $nodeinfo = json_decode($curlResult->getBody(), true);
 318
 319                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 320                         return [];
 321                 }
 322
 323                 $nodeinfo1_url = '';
 324                 $nodeinfo2_url = '';
 325
 326                 foreach ($nodeinfo['links'] as $link) {
 327                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 328                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 329                                 continue;
 330                         }
 331                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 332                                 $nodeinfo1_url = $link['href'];
 333                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 334                                 $nodeinfo2_url = $link['href'];
 335                         }
 336                 }
 337
 338                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 339                         return [];
 340                 }
 341
 342                 $server = [];
 343
 344                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 345                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 346                         $server = self::parseNodeinfo2($nodeinfo2_url);
 347                 }
 348
 349                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 350                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 351                         $server = self::parseNodeinfo1($nodeinfo1_url);
 352                 }
 353
 354                 return $server;
 355         }
 356
 357         /**
 358          * @brief Parses Nodeinfo 1
 359          *
 360          * @param string $nodeinfo_url address of the nodeinfo path
 361          * @return array Server data
 362          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 363          */
 364         private static function parseNodeinfo1($nodeinfo_url)
 365         {
 366                 $curlResult = Network::curl($nodeinfo_url);
 367
 368                 if (!$curlResult->isSuccess()) {
 369                         return false;
 370                 }
 371
 372                 $nodeinfo = json_decode($curlResult->getBody(), true);
 373
 374                 if (!is_array($nodeinfo)) {
 375                         return false;
 376                 }
 377
 378                 $server = [];
 379
 380                 $server['register_policy'] = Register::CLOSED;
 381
 382                 if (!empty($nodeinfo['openRegistrations'])) {
 383                         $server['register_policy'] = Register::OPEN;
 384                 }
 385
 386                 if (is_array($nodeinfo['software'])) {
 387                         if (!empty($nodeinfo['software']['name'])) {
 388                                 $server['platform'] = $nodeinfo['software']['name'];
 389                         }
 390
 391                         if (!empty($nodeinfo['software']['version'])) {
 392                                 $server['version'] = $nodeinfo['software']['version'];
 393                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 394                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 395                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 396                         }
 397                 }
 398
 399                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 400                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 401                 }
 402
 403                 if (!empty($nodeinfo['usage']['users']['total'])) {
 404                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 405                 }
 406
 407                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 408                         $protocols = [];
 409                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 410                                 $protocols[$protocol] = true;
 411                         }
 412
 413                         if (!empty($protocols['friendica'])) {
 414                                 $server['network'] = Protocol::DFRN;
 415                         } elseif (!empty($protocols['activitypub'])) {
 416                                 $server['network'] = Protocol::ACTIVITYPUB;
 417                         } elseif (!empty($protocols['diaspora'])) {
 418                                 $server['network'] = Protocol::DIASPORA;
 419                         } elseif (!empty($protocols['ostatus'])) {
 420                                 $server['network'] = Protocol::OSTATUS;
 421                         } elseif (!empty($protocols['gnusocial'])) {
 422                                 $server['network'] = Protocol::OSTATUS;
 423                         } elseif (!empty($protocols['zot'])) {
 424                                 $server['network'] = Protocol::ZOT;
 425                         }
 426                 }
 427
 428                 if (!$server) {
 429                         return false;
 430                 }
 431
 432                 return $server;
 433         }
 434
 435         /**
 436          * @brief Parses Nodeinfo 2
 437          *
 438          * @param string $nodeinfo_url address of the nodeinfo path
 439          * @return array Server data
 440          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 441          */
 442         private static function parseNodeinfo2($nodeinfo_url)
 443         {
 444                 $curlResult = Network::curl($nodeinfo_url);
 445                 if (!$curlResult->isSuccess()) {
 446                         return false;
 447                 }
 448
 449                 $nodeinfo = json_decode($curlResult->getBody(), true);
 450
 451                 if (!is_array($nodeinfo)) {
 452                         return false;
 453                 }
 454
 455                 $server = [];
 456
 457                 $server['register_policy'] = Register::CLOSED;
 458
 459                 if (!empty($nodeinfo['openRegistrations'])) {
 460                         $server['register_policy'] = Register::OPEN;
 461                 }
 462
 463                 if (is_array($nodeinfo['software'])) {
 464                         if (!empty($nodeinfo['software']['name'])) {
 465                                 $server['platform'] = $nodeinfo['software']['name'];
 466                         }
 467
 468                         if (!empty($nodeinfo['software']['version'])) {
 469                                 $server['version'] = $nodeinfo['software']['version'];
 470                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 471                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 472                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 473                         }
 474                 }
 475
 476                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 477                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 478                 }
 479
 480                 if (!empty($nodeinfo['usage']['users']['total'])) {
 481                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 482                 }
 483
 484                 if (!empty($nodeinfo['protocols'])) {
 485                         $protocols = [];
 486                         foreach ($nodeinfo['protocols'] as $protocol) {
 487                                 $protocols[$protocol] = true;
 488                         }
 489
 490                         if (!empty($protocols['friendica'])) {
 491                                 $server['network'] = Protocol::DFRN;
 492                         } elseif (!empty($protocols['activitypub'])) {
 493                                 $server['network'] = Protocol::ACTIVITYPUB;
 494                         } elseif (!empty($protocols['diaspora'])) {
 495                                 $server['network'] = Protocol::DIASPORA;
 496                         } elseif (!empty($protocols['ostatus'])) {
 497                                 $server['network'] = Protocol::OSTATUS;
 498                         } elseif (!empty($protocols['gnusocial'])) {
 499                                 $server['network'] = Protocol::OSTATUS;
 500                         } elseif (!empty($protocols['zot'])) {
 501                                 $server['network'] = Protocol::ZOT;
 502                         }
 503                 }
 504
 505                 if (empty($server)) {
 506                         return false;
 507                 }
 508
 509                 return $server;
 510         }
 511
 512         private static function fetchSiteinfo($url, $serverdata)
 513         {
 514                 $curlResult = Network::curl($url . '/siteinfo.json');
 515                 if (!$curlResult->isSuccess()) {
 516                         return $serverdata;
 517                 }
 518
 519                 $data = json_decode($curlResult->getBody(), true);
 520                 if (empty($data)) {
 521                         return $serverdata;
 522                 }
 523
 524                 if (!empty($data['url'])) {
 525                         $serverdata['platform'] = $data['platform'];
 526                         $serverdata['version'] = $data['version'];
 527                 }
 528
 529                 if (!empty($data['plugins'])) {
 530                         if (in_array('pubcrawl', $data['plugins'])) {
 531                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 532                         } elseif (in_array('diaspora', $data['plugins'])) {
 533                                 $serverdata['network'] = Protocol::DIASPORA;
 534                         } elseif (in_array('gnusoc', $data['plugins'])) {
 535                                 $serverdata['network'] = Protocol::OSTATUS;
 536                         } else {
 537                                 $serverdata['network'] = Protocol::ZOT;
 538                         }
 539                 }
 540
 541                 if (!empty($data['site_name'])) {
 542                         $serverdata['site_name'] = $data['site_name'];
 543                 }
 544
 545                 if (!empty($data['channels_total'])) {
 546                         $serverdata['registered-users'] = $data['channels_total'];
 547                 }
 548
 549                 if (!empty($data['register_policy'])) {
 550                         switch ($data['register_policy']) {
 551                                 case 'REGISTER_OPEN':
 552                                         $serverdata['register_policy'] = Register::OPEN;
 553                                         break;
 554
 555                                 case 'REGISTER_APPROVE':
 556                                         $serverdata['register_policy'] = Register::APPROVE;
 557                                         break;
 558
 559                                 case 'REGISTER_CLOSED':
 560                                 default:
 561                                         $serverdata['register_policy'] = Register::CLOSED;
 562                                         break;
 563                         }
 564                 }
 565
 566                 return $serverdata;
 567         }
 568
 569         private static function validHostMeta($url)
 570         {
 571                 $xrd_timeout = Config::get('system', 'xrd_timeout');
 572                 $curlResult = Network::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 573                 if (!$curlResult->isSuccess()) {
 574                         return false;
 575                 }
 576
 577                 $xrd = XML::parseString($curlResult->getBody(), false);
 578                 if (!is_object($xrd)) {
 579                         return false;
 580                 }
 581
 582                 $elements = XML::elementToArray($xrd);
 583                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 584                         return false;
 585                 }
 586
 587                 $valid = false;
 588                 foreach ($elements['xrd']['link'] as $link) {
 589                         if (empty($link['rel']) || empty($link['type']) || empty($link['template'])) {
 590                                 continue;
 591                         }
 592
 593                         if ($link['type'] == 'application/xrd+xml') {
 594                                 // When the webfinger host is the same like the system host, it should be ok.
 595                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 596                         }
 597                 }
 598
 599                 return $valid;
 600         }
 601
 602         private static function checkPoCo($url, $serverdata)
 603         {
 604                 $curlResult = Network::curl($url. '/poco');
 605                 if (!$curlResult->isSuccess()) {
 606                         return $serverdata;
 607                 }
 608
 609                 $data = json_decode($curlResult->getBody(), true);
 610                 if (empty($data)) {
 611                         return $serverdata;
 612                 }
 613
 614                 if (!empty($data['totalResults'])) {
 615                         $registeredUsers = $serverdata['registered-users'] ?? 0;
 616                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
 617                         $serverdata['poco'] = $url . '/poco';
 618                 } else {
 619                         $serverdata['poco'] = '';
 620                 }
 621
 622                 return $serverdata;
 623         }
 624
 625         private static function detectNextcloud($url, $serverdata)
 626         {
 627                 $curlResult = Network::curl($url . '/status.php');
 628
 629                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 630                         return $serverdata;
 631                 }
 632
 633                 $data = json_decode($curlResult->getBody(), true);
 634                 if (empty($data)) {
 635                         return $serverdata;
 636                 }
 637
 638                 if (!empty($data['version'])) {
 639                         $serverdata['platform'] = 'nextcloud';
 640                         $serverdata['version'] = $data['version'];
 641                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 642                 }
 643
 644                 return $serverdata;
 645         }
 646
 647         private static function detectMastodonAlikes($url, $serverdata)
 648         {
 649                 $curlResult = Network::curl($url . '/api/v1/instance');
 650
 651                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 652                         return $serverdata;
 653                 }
 654
 655                 $data = json_decode($curlResult->getBody(), true);
 656                 if (empty($data)) {
 657                         return $serverdata;
 658                 }
 659
 660                 if (!empty($data['version'])) {
 661                         $serverdata['platform'] = 'mastodon';
 662                         $serverdata['version'] = defaults($data, 'version', '');
 663                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 664                 }
 665
 666                 if (!empty($data['title'])) {
 667                         $serverdata['site_name'] = $data['title'];
 668                 }
 669
 670                 if (!empty($data['description'])) {
 671                         $serverdata['info'] = trim($data['description']);
 672                 }
 673
 674                 if (!empty($data['stats']['user_count'])) {
 675                         $serverdata['registered-users'] = $data['stats']['user_count'];
 676                 }
 677
 678                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
 679                         $serverdata['platform'] = $matches[1];
 680                         $serverdata['version'] = $matches[2];
 681                 }
 682
 683                 if (!empty($serverdata['version']) && strstr($serverdata['version'], 'Pleroma')) {
 684                         $serverdata['platform'] = 'pleroma';
 685                         $serverdata['version'] = trim(str_replace('Pleroma', '', $serverdata['version']));
 686                 }
 687
 688                 return $serverdata;
 689         }
 690
 691         private static function detectHubzilla($url, $serverdata)
 692         {
 693                 $curlResult = Network::curl($url . '/api/statusnet/config.json');
 694                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 695                         return $serverdata;
 696                 }
 697
 698                 $data = json_decode($curlResult->getBody(), true);
 699                 if (empty($data)) {
 700                         return $serverdata;
 701                 }
 702
 703                 if (!empty($data['site']['name'])) {
 704                         $serverdata['site_name'] = $data['site']['name'];
 705                 }
 706
 707                 if (!empty($data['site']['platform'])) {
 708                         $serverdata['platform'] = $data['site']['platform']['PLATFORM_NAME'];
 709                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
 710                         $serverdata['network'] = Protocol::ZOT;
 711                 }
 712
 713                 if (!empty($data['site']['hubzilla'])) {
 714                         $serverdata['platform'] = $data['site']['hubzilla']['PLATFORM_NAME'];
 715                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
 716                         $serverdata['network'] = Protocol::ZOT;
 717                 }
 718
 719                 if (!empty($data['site']['redmatrix'])) {
 720                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
 721                                 $serverdata['platform'] = $data['site']['redmatrix']['PLATFORM_NAME'];
 722                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
 723                                 $serverdata['platform'] = $data['site']['redmatrix']['RED_PLATFORM'];
 724                         }
 725
 726                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
 727                         $serverdata['network'] = Protocol::ZOT;
 728                 }
 729
 730                 $private = false;
 731                 $inviteonly = false;
 732                 $closed = false;
 733
 734                 if (!empty($data['site']['closed'])) {
 735                         $closed = self::toBoolean($data['site']['closed']);
 736                 }
 737
 738                 if (!empty($data['site']['private'])) {
 739                         $private = self::toBoolean($data['site']['private']);
 740                 }
 741
 742                 if (!empty($data['site']['inviteonly'])) {
 743                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
 744                 }
 745
 746                 if (!$closed && !$private and $inviteonly) {
 747                         $register_policy = Register::APPROVE;
 748                 } elseif (!$closed && !$private) {
 749                         $register_policy = Register::OPEN;
 750                 } else {
 751                         $register_policy = Register::CLOSED;
 752                 }
 753
 754                 return $serverdata;
 755         }
 756
 757         private static function toBoolean($val)
 758         {
 759                 if (($val == 'true') || ($val == 1)) {
 760                         return true;
 761                 } elseif (($val == 'false') || ($val == 0)) {
 762                         return false;
 763                 }
 764
 765                 return $val;
 766         }
 767
 768         private static function detectGNUSocial($url, $serverdata)
 769         {
 770                 $curlResult = Network::curl($url . '/api/statusnet/version.json');
 771
 772                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
 773                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
 774                         $serverdata['platform'] = 'StatusNet';
 775                         // Remove junk that some GNU Social servers return
 776                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
 777                         $serverdata['version'] = trim($serverdata['version'], '"');
 778                         $serverdata['network'] = Protocol::OSTATUS;
 779                 }
 780
 781                 // Test for GNU Social
 782                 $curlResult = Network::curl($url . '/api/gnusocial/version.json');
 783
 784                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
 785                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
 786                         $serverdata['platform'] = 'GNU Social';
 787                         // Remove junk that some GNU Social servers return
 788                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
 789                         $serverdata['version'] = trim($serverdata['version'], '"');
 790                         $serverdata['network'] = Protocol::OSTATUS;
 791                 }
 792
 793                 return $serverdata;
 794         }
 795
 796         private static function detectFriendica($url, $serverdata)
 797         {
 798                 $curlResult = Network::curl($url . '/friendica/json');
 799                 if (!$curlResult->isSuccess()) {
 800                         $curlResult = Network::curl($url . '/friendika/json');
 801                 }
 802
 803                 if (!$curlResult->isSuccess()) {
 804                         return $serverdata;
 805                 }
 806
 807                 $data = json_decode($curlResult->getBody(), true);
 808                 if (empty($data) || empty($data['version'])) {
 809                         return $serverdata;
 810                 }
 811
 812                 $serverdata['network'] = Protocol::DFRN;
 813                 $serverdata['version'] = $data['version'];
 814
 815                 if (!empty($data['no_scrape_url'])) {
 816                         $serverdata['noscrape'] = $data['no_scrape_url'];
 817                 }
 818
 819                 if (!empty($data['site_name'])) {
 820                         $serverdata['site_name'] = $data['site_name'];
 821                 }
 822
 823                 if (!empty($data['info'])) {
 824                         $serverdata['info'] = trim($data['info']);
 825                 }
 826
 827                 $register_policy = defaults($data, 'register_policy', 'REGISTER_CLOSED');
 828                 switch ($register_policy) {
 829                         case 'REGISTER_OPEN':
 830                                 $serverdata['register_policy'] = Register::OPEN;
 831                                 break;
 832
 833                         case 'REGISTER_APPROVE':
 834                                 $serverdata['register_policy'] = Register::APPROVE;
 835                                 break;
 836
 837                         case 'REGISTER_CLOSED':
 838                         case 'REGISTER_INVITATION':
 839                                 $serverdata['register_policy'] = Register::CLOSED;
 840                                 break;
 841                         default:
 842                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
 843                                 $serverdata['register_policy'] = Register::CLOSED;
 844                                 break;
 845                 }
 846
 847                 $serverdata['platform'] = defaults($data, 'platform', '');
 848
 849                 return $serverdata;
 850         }
 851
 852         private static function analyseRootBody($curlResult, $serverdata)
 853         {
 854                 $doc = new DOMDocument();
 855                 @$doc->loadHTML($curlResult->getBody());
 856                 $xpath = new DOMXPath($doc);
 857
 858                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
 859                 if (!empty($title)) {
 860                         $serverdata['site_name'] = $title;
 861                 }
 862
 863                 $list = $xpath->query('//meta[@name]');
 864
 865                 foreach ($list as $node) {
 866                         $attr = [];
 867                         if ($node->attributes->length) {
 868                                 foreach ($node->attributes as $attribute) {
 869                                         $attribute->value = trim($attribute->value);
 870                                         if (empty($attribute->value)) {
 871                                                 continue;
 872                                         }
 873
 874                                         $attr[$attribute->name] = $attribute->value;
 875                                 }
 876
 877                                 if (empty($attr['name']) || empty($attr['content'])) {
 878                                         continue;
 879                                 }
 880                         }
 881
 882                         if ($attr['name'] == 'description') {
 883                                 $serverdata['info'] = $attr['content'];
 884                         }
 885
 886                         if ($attr['name'] == 'application-name') {
 887                                 $serverdata['platform'] = $attr['content'];
 888                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
 889                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 890                                 }
 891                         }
 892
 893                         if ($attr['name'] == 'generator') {
 894                                 $serverdata['platform'] = $attr['content'];
 895
 896                                 $version_part = explode(' ', $attr['content']);
 897
 898                                 if (count($version_part) == 2) {
 899                                         if (in_array($version_part[0], ['WordPress'])) {
 900                                                 $serverdata['platform'] = $version_part[0];
 901                                                 $serverdata['version'] = $version_part[1];
 902                                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 903                                         }
 904                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
 905                                                 $serverdata['platform'] = $version_part[0];
 906                                                 $serverdata['version'] = $version_part[1];
 907                                                 $serverdata['network'] = Protocol::DFRN;
 908                                         }
 909                                 }
 910                         }
 911                 }
 912
 913                 $list = $xpath->query('//meta[@property]');
 914
 915                 foreach ($list as $node) {
 916                         $attr = [];
 917                         if ($node->attributes->length) {
 918                                 foreach ($node->attributes as $attribute) {
 919                                         $attribute->value = trim($attribute->value);
 920                                         if (empty($attribute->value)) {
 921                                                 continue;
 922                                         }
 923
 924                                         $attr[$attribute->name] = $attribute->value;
 925                                 }
 926
 927                                 if (empty($attr['property']) || empty($attr['content'])) {
 928                                         continue;
 929                                 }
 930                         }
 931
 932                         if ($attr['property'] == 'og:site_name') {
 933                                 $serverdata['site_name'] = $attr['content'];
 934                         }
 935
 936                         if ($attr['property'] == 'og:description') {
 937                                 $serverdata['info'] = $attr['content'];
 938                         }
 939
 940                         if ($attr['property'] == 'og:platform') {
 941                                 $serverdata['platform'] = $attr['content'];
 942
 943                                 if (in_array($attr['content'], ['PeerTube'])) {
 944                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 945                                 }
 946                         }
 947
 948                         if ($attr['property'] == 'generator') {
 949                                 $serverdata['platform'] = $attr['content'];
 950
 951                                 if (in_array($attr['content'], ['hubzilla'])) {
 952                                         // We later check which compatible protocol modules are loaded.
 953                                         $serverdata['network'] = Protocol::ZOT;
 954                                 }
 955                         }
 956                 }
 957
 958                 return $serverdata;
 959         }
 960
 961         private static function analyseRootHeader($curlResult, $serverdata)
 962         {
 963                 if ($curlResult->getHeader('server') == 'Mastodon') {
 964                         $serverdata['platform'] = 'mastodon';
 965                         $serverdata['network'] = $network = Protocol::ACTIVITYPUB;
 966                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
 967                         $serverdata['platform'] = 'diaspora';
 968                         $serverdata['network'] = $network = Protocol::DIASPORA;
 969                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
 970
 971                 } elseif ($curlResult->inHeader('x-friendica-version')) {
 972                         $serverdata['platform'] = 'friendica';
 973                         $serverdata['network'] = $network = Protocol::DFRN;
 974                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
 975                 }
 976                 return $serverdata;
 977         }
 978 }