src/Model/GServer.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use DOMDocument;
  25 use DOMXPath;
  26 use Friendica\Core\Protocol;
  27 use Friendica\Core\Worker;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Module\Register;
  31 use Friendica\Network\CurlResult;
  32 use Friendica\Util\Network;
  33 use Friendica\Util\DateTimeFormat;
  34 use Friendica\Util\Strings;
  35 use Friendica\Util\XML;
  36 use Friendica\Core\Logger;
  37 use Friendica\Protocol\PortableContact;
  38 use Friendica\Protocol\Diaspora;
  39 use Friendica\Network\Probe;
  40
  41 /**
  42  * This class handles GServer related functions
  43  */
  44 class GServer
  45 {
  46         // Directory types
  47         const DT_NONE = 0;
  48         const DT_POCO = 1;
  49         const DT_MASTODON = 2;
  50         /**
  51          * Checks if the given server is reachable
  52          *
  53          * @param string  $profile URL of the given profile
  54          * @param string  $server  URL of the given server (If empty, taken from profile)
  55          * @param string  $network Network value that is used, when detection failed
  56          * @param boolean $force   Force an update.
  57          *
  58          * @return boolean 'true' if server seems vital
  59          */
  60         public static function reachable(string $profile, string $server = '', string $network = '', bool $force = false)
  61         {
  62                 if ($server == '') {
  63                         $server = GContact::getBasepath($profile);
  64                 }
  65
  66                 if ($server == '') {
  67                         return true;
  68                 }
  69
  70                 return self::check($server, $network, $force);
  71         }
  72
  73         /**
  74          * Decides if a server needs to be updated, based upon several date fields
  75          *
  76          * @param date $created      Creation date of that server entry
  77          * @param date $updated      When had the server entry be updated
  78          * @param date $last_failure Last failure when contacting that server
  79          * @param date $last_contact Last time the server had been contacted
  80          *
  81          * @return boolean Does the server record needs an update?
  82          */
  83         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
  84         {
  85                 $now = strtotime(DateTimeFormat::utcNow());
  86
  87                 if ($updated > $last_contact) {
  88                         $contact_time = strtotime($updated);
  89                 } else {
  90                         $contact_time = strtotime($last_contact);
  91                 }
  92
  93                 $failure_time = strtotime($last_failure);
  94                 $created_time = strtotime($created);
  95
  96                 // If there is no "created" time then use the current time
  97                 if ($created_time <= 0) {
  98                         $created_time = $now;
  99                 }
 100
 101                 // If the last contact was less than 24 hours then don't update
 102                 if (($now - $contact_time) < (60 * 60 * 24)) {
 103                         return false;
 104                 }
 105
 106                 // If the last failure was less than 24 hours then don't update
 107                 if (($now - $failure_time) < (60 * 60 * 24)) {
 108                         return false;
 109                 }
 110
 111                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 112                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 113                 //      return false;
 114
 115                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 116                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 117                         return false;
 118                 }
 119
 120                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 121                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 122                         return false;
 123                 }
 124
 125                 return true;
 126         }
 127
 128         /**
 129          * Checks the state of the given server.
 130          *
 131          * @param string  $server_url URL of the given server
 132          * @param string  $network    Network value that is used, when detection failed
 133          * @param boolean $force      Force an update.
 134          *
 135          * @return boolean 'true' if server seems vital
 136          */
 137         public static function check(string $server_url, string $network = '', bool $force = false)
 138         {
 139                 // Unify the server address
 140                 $server_url = trim($server_url, '/');
 141                 $server_url = str_replace('/index.php', '', $server_url);
 142
 143                 if ($server_url == '') {
 144                         return false;
 145                 }
 146
 147                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 148                 if (DBA::isResult($gserver)) {
 149                         if ($gserver['created'] <= DBA::NULL_DATETIME) {
 150                                 $fields = ['created' => DateTimeFormat::utcNow()];
 151                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 152                                 DBA::update('gserver', $fields, $condition);
 153                         }
 154
 155                         $last_contact = $gserver['last_contact'];
 156                         $last_failure = $gserver['last_failure'];
 157
 158                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 159                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 160                         if ($last_contact < DBA::NULL_DATETIME) {
 161                                 $last_contact = DBA::NULL_DATETIME;
 162                         }
 163
 164                         if ($last_failure < DBA::NULL_DATETIME) {
 165                                 $last_failure = DBA::NULL_DATETIME;
 166                         }
 167
 168                         if (!$force && !self::updateNeeded($gserver['created'], '', $last_failure, $last_contact)) {
 169                                 Logger::info('No update needed', ['server' => $server_url]);
 170                                 return ($last_contact >= $last_failure);
 171                         }
 172                         Logger::info('Server is outdated. Start discovery.', ['Server' => $server_url, 'Force' => $force, 'Created' => $gserver['created'], 'Failure' => $last_failure, 'Contact' => $last_contact]);
 173                 } else {
 174                         Logger::info('Server is unknown. Start discovery.', ['Server' => $server_url]);
 175                 }
 176
 177                 return self::detect($server_url, $network);
 178         }
 179
 180         /**
 181          * Detect server data (type, protocol, version number, ...)
 182          * The detected data is then updated or inserted in the gserver table.
 183          *
 184          * @param string  $url     URL of the given server
 185          * @param string  $network Network value that is used, when detection failed
 186          *
 187          * @return boolean 'true' if server could be detected
 188          */
 189         public static function detect(string $url, string $network = '')
 190         {
 191                 Logger::info('Detect server type', ['server' => $url]);
 192                 $serverdata = [];
 193
 194                 $original_url = $url;
 195
 196                 // Remove URL content that is not supposed to exist for a server url
 197                 $urlparts = parse_url($url);
 198                 unset($urlparts['user']);
 199                 unset($urlparts['pass']);
 200                 unset($urlparts['query']);
 201                 unset($urlparts['fragment']);
 202                 $url = Network::unparseURL($urlparts);
 203
 204                 // If the URL missmatches, then we mark the old entry as failure
 205                 if ($url != $original_url) {
 206                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($original_url)]);
 207                 }
 208
 209                 // When a nodeinfo is present, we don't need to dig further
 210                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 211                 $curlResult = Network::curl($url . '/.well-known/nodeinfo', false, ['timeout' => $xrd_timeout]);
 212                 if ($curlResult->isTimeout()) {
 213                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 214                         return false;
 215                 }
 216
 217                 $nodeinfo = self::fetchNodeinfo($url, $curlResult);
 218
 219                 // When nodeinfo isn't present, we use the older 'statistics.json' endpoint
 220                 if (empty($nodeinfo)) {
 221                         $nodeinfo = self::fetchStatistics($url);
 222                 }
 223
 224                 // If that didn't work out well, we use some protocol specific endpoints
 225                 // For Friendica and Zot based networks we have to dive deeper to reveal more details
 226                 if (empty($nodeinfo['network']) || in_array($nodeinfo['network'], [Protocol::DFRN, Protocol::ZOT])) {
 227                         // Fetch the landing page, possibly it reveals some data
 228                         if (empty($nodeinfo['network'])) {
 229                                 $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout]);
 230                                 if ($curlResult->isSuccess()) {
 231                                         $serverdata = self::analyseRootHeader($curlResult, $serverdata);
 232                                         $serverdata = self::analyseRootBody($curlResult, $serverdata, $url);
 233                                 }
 234
 235                                 if (!$curlResult->isSuccess() || empty($curlResult->getBody()) || self::invalidBody($curlResult->getBody())) {
 236                                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 237                                         return false;
 238                                 }
 239                         }
 240
 241                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ACTIVITYPUB)) {
 242                                 $serverdata = self::detectMastodonAlikes($url, $serverdata);
 243                         }
 244
 245                         // All following checks are done for systems that always have got a "host-meta" endpoint.
 246                         // With this check we don't have to waste time and ressources for dead systems.
 247                         // Also this hopefully prevents us from receiving abuse messages.
 248                         if (empty($serverdata['network']) && !self::validHostMeta($url)) {
 249                                 DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($url)]);
 250                                 return false;
 251                         }
 252
 253                         if (empty($serverdata['network']) || in_array($serverdata['network'], [Protocol::DFRN, Protocol::ACTIVITYPUB])) {
 254                                 $serverdata = self::detectFriendica($url, $serverdata);
 255                         }
 256
 257                         // the 'siteinfo.json' is some specific endpoint of Hubzilla and Red
 258                         if (empty($serverdata['network']) || ($serverdata['network'] == Protocol::ZOT)) {
 259                                 $serverdata = self::fetchSiteinfo($url, $serverdata);
 260                         }
 261
 262                         // The 'siteinfo.json' doesn't seem to be present on older Hubzilla installations
 263                         if (empty($serverdata['network'])) {
 264                                 $serverdata = self::detectHubzilla($url, $serverdata);
 265                         }
 266
 267                         if (empty($serverdata['network'])) {
 268                                 $serverdata = self::detectNextcloud($url, $serverdata);
 269                         }
 270
 271                         if (empty($serverdata['network'])) {
 272                                 $serverdata = self::detectGNUSocial($url, $serverdata);
 273                         }
 274                 } else {
 275                         $serverdata = $nodeinfo;
 276                 }
 277
 278                 // Detect the directory type
 279                 $serverdata['directory-type'] = self::DT_NONE;
 280                 $serverdata = self::checkPoCo($url, $serverdata);
 281                 $serverdata = self::checkMastodonDirectory($url, $serverdata);
 282
 283                 // We can't detect the network type. Possibly it is some system that we don't know yet
 284                 if (empty($serverdata['network'])) {
 285                         $serverdata['network'] = Protocol::PHANTOM;
 286                 }
 287
 288                 // When we hadn't been able to detect the network type, we use the hint from the parameter
 289                 if (($serverdata['network'] == Protocol::PHANTOM) && !empty($network)) {
 290                         $serverdata['network'] = $network;
 291                 }
 292
 293                 $serverdata['url'] = $url;
 294                 $serverdata['nurl'] = Strings::normaliseLink($url);
 295
 296                 // We take the highest number that we do find
 297                 $registeredUsers = $serverdata['registered-users'] ?? 0;
 298
 299                 // On an active server there has to be at least a single user
 300                 if (($serverdata['network'] != Protocol::PHANTOM) && ($registeredUsers == 0)) {
 301                         $registeredUsers = 1;
 302                 }
 303
 304                 if ($serverdata['network'] != Protocol::PHANTOM) {
 305                         $gcontacts = DBA::count('gcontact', ['server_url' => [$url, $serverdata['nurl']]]);
 306                         $apcontacts = DBA::count('apcontact', ['baseurl' => [$url, $serverdata['nurl']]]);
 307                         $contacts = DBA::count('contact', ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 308                         $serverdata['registered-users'] = max($gcontacts, $apcontacts, $contacts, $registeredUsers);
 309                 } else {
 310                         $serverdata['registered-users'] = $registeredUsers;
 311                         $serverdata = self::detectNetworkViaContacts($url, $serverdata);
 312                 }
 313
 314                 $serverdata['last_contact'] = DateTimeFormat::utcNow();
 315
 316                 $gserver = DBA::selectFirst('gserver', ['network'], ['nurl' => Strings::normaliseLink($url)]);
 317                 if (!DBA::isResult($gserver)) {
 318                         $serverdata['created'] = DateTimeFormat::utcNow();
 319                         $ret = DBA::insert('gserver', $serverdata);
 320                 } else {
 321                         // Don't override the network with 'unknown' when there had been a valid entry before
 322                         if (($serverdata['network'] == Protocol::PHANTOM) && !empty($gserver['network'])) {
 323                                 unset($serverdata['network']);
 324                         }
 325
 326                         $ret = DBA::update('gserver', $serverdata, ['nurl' => $serverdata['nurl']]);
 327                 }
 328
 329                 if (!empty($serverdata['network']) && in_array($serverdata['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 330                         self::discoverRelay($url);
 331                 }
 332
 333                 return $ret;
 334         }
 335
 336         /**
 337          * Fetch relay data from a given server url
 338          *
 339          * @param string $server_url address of the server
 340          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 341          */
 342         private static function discoverRelay(string $server_url)
 343         {
 344                 Logger::info('Discover relay data', ['server' => $server_url]);
 345
 346                 $curlResult = Network::curl($server_url . '/.well-known/x-social-relay');
 347                 if (!$curlResult->isSuccess()) {
 348                         return;
 349                 }
 350
 351                 $data = json_decode($curlResult->getBody(), true);
 352                 if (!is_array($data)) {
 353                         return;
 354                 }
 355
 356                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
 357                 if (!DBA::isResult($gserver)) {
 358                         return;
 359                 }
 360
 361                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
 362                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
 363                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
 364                 }
 365
 366                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
 367
 368                 if ($data['scope'] == 'tags') {
 369                         // Avoid duplicates
 370                         $tags = [];
 371                         foreach ($data['tags'] as $tag) {
 372                                 $tag = mb_strtolower($tag);
 373                                 if (strlen($tag) < 100) {
 374                                         $tags[$tag] = $tag;
 375                                 }
 376                         }
 377
 378                         foreach ($tags as $tag) {
 379                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
 380                         }
 381                 }
 382
 383                 // Create or update the relay contact
 384                 $fields = [];
 385                 if (isset($data['protocols'])) {
 386                         if (isset($data['protocols']['diaspora'])) {
 387                                 $fields['network'] = Protocol::DIASPORA;
 388
 389                                 if (isset($data['protocols']['diaspora']['receive'])) {
 390                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
 391                                 } elseif (is_string($data['protocols']['diaspora'])) {
 392                                         $fields['batch'] = $data['protocols']['diaspora'];
 393                                 }
 394                         }
 395
 396                         if (isset($data['protocols']['dfrn'])) {
 397                                 $fields['network'] = Protocol::DFRN;
 398
 399                                 if (isset($data['protocols']['dfrn']['receive'])) {
 400                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
 401                                 } elseif (is_string($data['protocols']['dfrn'])) {
 402                                         $fields['batch'] = $data['protocols']['dfrn'];
 403                                 }
 404                         }
 405                 }
 406                 Diaspora::setRelayContact($server_url, $fields);
 407         }
 408
 409         /**
 410          * Fetch server data from '/statistics.json' on the given server
 411          *
 412          * @param string $url URL of the given server
 413          *
 414          * @return array server data
 415          */
 416         private static function fetchStatistics(string $url)
 417         {
 418                 $curlResult = Network::curl($url . '/statistics.json');
 419                 if (!$curlResult->isSuccess()) {
 420                         return [];
 421                 }
 422
 423                 $data = json_decode($curlResult->getBody(), true);
 424                 if (empty($data)) {
 425                         return [];
 426                 }
 427
 428                 $serverdata = [];
 429
 430                 if (!empty($data['version'])) {
 431                         $serverdata['version'] = $data['version'];
 432                         // Version numbers on statistics.json are presented with additional info, e.g.:
 433                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 434                         $serverdata['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $serverdata['version']);
 435                 }
 436
 437                 if (!empty($data['name'])) {
 438                         $serverdata['site_name'] = $data['name'];
 439                 }
 440
 441                 if (!empty($data['network'])) {
 442                         $serverdata['platform'] = strtolower($data['network']);
 443
 444                         if ($serverdata['platform'] == 'diaspora') {
 445                                 $serverdata['network'] = Protocol::DIASPORA;
 446                         } elseif ($serverdata['platform'] == 'friendica') {
 447                                 $serverdata['network'] = Protocol::DFRN;
 448                         } elseif ($serverdata['platform'] == 'hubzilla') {
 449                                 $serverdata['network'] = Protocol::ZOT;
 450                         } elseif ($serverdata['platform'] == 'redmatrix') {
 451                                 $serverdata['network'] = Protocol::ZOT;
 452                         }
 453                 }
 454
 455
 456                 if (!empty($data['registrations_open'])) {
 457                         $serverdata['register_policy'] = Register::OPEN;
 458                 } else {
 459                         $serverdata['register_policy'] = Register::CLOSED;
 460                 }
 461
 462                 return $serverdata;
 463         }
 464
 465         /**
 466          * Detect server type by using the nodeinfo data
 467          *
 468          * @param string     $url        address of the server
 469          * @param CurlResult $curlResult
 470          * @return array Server data
 471          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 472          */
 473         private static function fetchNodeinfo(string $url, CurlResult $curlResult)
 474         {
 475                 $nodeinfo = json_decode($curlResult->getBody(), true);
 476
 477                 if (!is_array($nodeinfo) || empty($nodeinfo['links'])) {
 478                         return [];
 479                 }
 480
 481                 $nodeinfo1_url = '';
 482                 $nodeinfo2_url = '';
 483
 484                 foreach ($nodeinfo['links'] as $link) {
 485                         if (!is_array($link) || empty($link['rel']) || empty($link['href'])) {
 486                                 Logger::info('Invalid nodeinfo format', ['url' => $url]);
 487                                 continue;
 488                         }
 489                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 490                                 $nodeinfo1_url = $link['href'];
 491                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 492                                 $nodeinfo2_url = $link['href'];
 493                         }
 494                 }
 495
 496                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 497                         return [];
 498                 }
 499
 500                 $server = [];
 501
 502                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 503                 if (!empty($nodeinfo2_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 504                         $server = self::parseNodeinfo2($nodeinfo2_url);
 505                 }
 506
 507                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 508                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 509                         $server = self::parseNodeinfo1($nodeinfo1_url);
 510                 }
 511
 512                 return $server;
 513         }
 514
 515         /**
 516          * Parses Nodeinfo 1
 517          *
 518          * @param string $nodeinfo_url address of the nodeinfo path
 519          * @return array Server data
 520          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 521          */
 522         private static function parseNodeinfo1(string $nodeinfo_url)
 523         {
 524                 $curlResult = Network::curl($nodeinfo_url);
 525
 526                 if (!$curlResult->isSuccess()) {
 527                         return [];
 528                 }
 529
 530                 $nodeinfo = json_decode($curlResult->getBody(), true);
 531
 532                 if (!is_array($nodeinfo)) {
 533                         return [];
 534                 }
 535
 536                 $server = [];
 537
 538                 $server['register_policy'] = Register::CLOSED;
 539
 540                 if (!empty($nodeinfo['openRegistrations'])) {
 541                         $server['register_policy'] = Register::OPEN;
 542                 }
 543
 544                 if (is_array($nodeinfo['software'])) {
 545                         if (!empty($nodeinfo['software']['name'])) {
 546                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 547                         }
 548
 549                         if (!empty($nodeinfo['software']['version'])) {
 550                                 $server['version'] = $nodeinfo['software']['version'];
 551                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 552                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 553                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 554                         }
 555                 }
 556
 557                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 558                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 559                 }
 560
 561                 if (!empty($nodeinfo['usage']['users']['total'])) {
 562                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 563                 }
 564
 565                 if (!empty($nodeinfo['protocols']['inbound']) && is_array($nodeinfo['protocols']['inbound'])) {
 566                         $protocols = [];
 567                         foreach ($nodeinfo['protocols']['inbound'] as $protocol) {
 568                                 $protocols[$protocol] = true;
 569                         }
 570
 571                         if (!empty($protocols['friendica'])) {
 572                                 $server['network'] = Protocol::DFRN;
 573                         } elseif (!empty($protocols['activitypub'])) {
 574                                 $server['network'] = Protocol::ACTIVITYPUB;
 575                         } elseif (!empty($protocols['diaspora'])) {
 576                                 $server['network'] = Protocol::DIASPORA;
 577                         } elseif (!empty($protocols['ostatus'])) {
 578                                 $server['network'] = Protocol::OSTATUS;
 579                         } elseif (!empty($protocols['gnusocial'])) {
 580                                 $server['network'] = Protocol::OSTATUS;
 581                         } elseif (!empty($protocols['zot'])) {
 582                                 $server['network'] = Protocol::ZOT;
 583                         }
 584                 }
 585
 586                 if (empty($server)) {
 587                         return [];
 588                 }
 589
 590                 return $server;
 591         }
 592
 593         /**
 594          * Parses Nodeinfo 2
 595          *
 596          * @param string $nodeinfo_url address of the nodeinfo path
 597          * @return array Server data
 598          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 599          */
 600         private static function parseNodeinfo2(string $nodeinfo_url)
 601         {
 602                 $curlResult = Network::curl($nodeinfo_url);
 603                 if (!$curlResult->isSuccess()) {
 604                         return [];
 605                 }
 606
 607                 $nodeinfo = json_decode($curlResult->getBody(), true);
 608
 609                 if (!is_array($nodeinfo)) {
 610                         return [];
 611                 }
 612
 613                 $server = [];
 614
 615                 $server['register_policy'] = Register::CLOSED;
 616
 617                 if (!empty($nodeinfo['openRegistrations'])) {
 618                         $server['register_policy'] = Register::OPEN;
 619                 }
 620
 621                 if (is_array($nodeinfo['software'])) {
 622                         if (!empty($nodeinfo['software']['name'])) {
 623                                 $server['platform'] = strtolower($nodeinfo['software']['name']);
 624                         }
 625
 626                         if (!empty($nodeinfo['software']['version'])) {
 627                                 $server['version'] = $nodeinfo['software']['version'];
 628                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 629                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 630                                 $server['version'] = preg_replace('=(.+)-(.{4,})=ism', '$1', $server['version']);
 631                         }
 632                 }
 633
 634                 if (!empty($nodeinfo['metadata']['nodeName'])) {
 635                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 636                 }
 637
 638                 if (!empty($nodeinfo['usage']['users']['total'])) {
 639                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 640                 }
 641
 642                 if (!empty($nodeinfo['protocols'])) {
 643                         $protocols = [];
 644                         foreach ($nodeinfo['protocols'] as $protocol) {
 645                                 $protocols[$protocol] = true;
 646                         }
 647
 648                         if (!empty($protocols['dfrn'])) {
 649                                 $server['network'] = Protocol::DFRN;
 650                         } elseif (!empty($protocols['activitypub'])) {
 651                                 $server['network'] = Protocol::ACTIVITYPUB;
 652                         } elseif (!empty($protocols['diaspora'])) {
 653                                 $server['network'] = Protocol::DIASPORA;
 654                         } elseif (!empty($protocols['ostatus'])) {
 655                                 $server['network'] = Protocol::OSTATUS;
 656                         } elseif (!empty($protocols['gnusocial'])) {
 657                                 $server['network'] = Protocol::OSTATUS;
 658                         } elseif (!empty($protocols['zot'])) {
 659                                 $server['network'] = Protocol::ZOT;
 660                         }
 661                 }
 662
 663                 if (empty($server)) {
 664                         return [];
 665                 }
 666
 667                 return $server;
 668         }
 669
 670         /**
 671          * Fetch server information from a 'siteinfo.json' file on the given server
 672          *
 673          * @param string $url        URL of the given server
 674          * @param array  $serverdata array with server data
 675          *
 676          * @return array server data
 677          */
 678         private static function fetchSiteinfo(string $url, array $serverdata)
 679         {
 680                 $curlResult = Network::curl($url . '/siteinfo.json');
 681                 if (!$curlResult->isSuccess()) {
 682                         return $serverdata;
 683                 }
 684
 685                 $data = json_decode($curlResult->getBody(), true);
 686                 if (empty($data)) {
 687                         return $serverdata;
 688                 }
 689
 690                 if (!empty($data['url'])) {
 691                         $serverdata['platform'] = strtolower($data['platform']);
 692                         $serverdata['version'] = $data['version'];
 693                 }
 694
 695                 if (!empty($data['plugins'])) {
 696                         if (in_array('pubcrawl', $data['plugins'])) {
 697                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
 698                         } elseif (in_array('diaspora', $data['plugins'])) {
 699                                 $serverdata['network'] = Protocol::DIASPORA;
 700                         } elseif (in_array('gnusoc', $data['plugins'])) {
 701                                 $serverdata['network'] = Protocol::OSTATUS;
 702                         } else {
 703                                 $serverdata['network'] = Protocol::ZOT;
 704                         }
 705                 }
 706
 707                 if (!empty($data['site_name'])) {
 708                         $serverdata['site_name'] = $data['site_name'];
 709                 }
 710
 711                 if (!empty($data['channels_total'])) {
 712                         $serverdata['registered-users'] = $data['channels_total'];
 713                 }
 714
 715                 if (!empty($data['register_policy'])) {
 716                         switch ($data['register_policy']) {
 717                                 case 'REGISTER_OPEN':
 718                                         $serverdata['register_policy'] = Register::OPEN;
 719                                         break;
 720
 721                                 case 'REGISTER_APPROVE':
 722                                         $serverdata['register_policy'] = Register::APPROVE;
 723                                         break;
 724
 725                                 case 'REGISTER_CLOSED':
 726                                 default:
 727                                         $serverdata['register_policy'] = Register::CLOSED;
 728                                         break;
 729                         }
 730                 }
 731
 732                 return $serverdata;
 733         }
 734
 735         /**
 736          * Checks if the server contains a valid host meta file
 737          *
 738          * @param string $url URL of the given server
 739          *
 740          * @return boolean 'true' if the server seems to be vital
 741          */
 742         private static function validHostMeta(string $url)
 743         {
 744                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout');
 745                 $curlResult = Network::curl($url . '/.well-known/host-meta', false, ['timeout' => $xrd_timeout]);
 746                 if (!$curlResult->isSuccess()) {
 747                         return false;
 748                 }
 749
 750                 $xrd = XML::parseString($curlResult->getBody(), false);
 751                 if (!is_object($xrd)) {
 752                         return false;
 753                 }
 754
 755                 $elements = XML::elementToArray($xrd);
 756                 if (empty($elements) || empty($elements['xrd']) || empty($elements['xrd']['link'])) {
 757                         return false;
 758                 }
 759
 760                 $valid = false;
 761                 foreach ($elements['xrd']['link'] as $link) {
 762                         // When there is more than a single "link" element, the array looks slightly different
 763                         if (!empty($link['@attributes'])) {
 764                                 $link = $link['@attributes'];
 765                         }
 766
 767                         if (empty($link['rel']) || empty($link['template'])) {
 768                                 continue;
 769                         }
 770
 771                         if ($link['rel'] == 'lrdd') {
 772                                 // When the webfinger host is the same like the system host, it should be ok.
 773                                 $valid = (parse_url($url, PHP_URL_HOST) == parse_url($link['template'], PHP_URL_HOST));
 774                         }
 775                 }
 776
 777                 return $valid;
 778         }
 779
 780         /**
 781          * Detect the network of the given server via their known contacts
 782          *
 783          * @param string $url        URL of the given server
 784          * @param array  $serverdata array with server data
 785          *
 786          * @return array server data
 787          */
 788         private static function detectNetworkViaContacts(string $url, array $serverdata)
 789         {
 790                 $contacts = [];
 791
 792                 $gcontacts = DBA::select('gcontact', ['url', 'nurl'], ['server_url' => [$url, $serverdata['nurl']]]);
 793                 while ($gcontact = DBA::fetch($gcontacts)) {
 794                         $contacts[$gcontact['nurl']] = $gcontact['url'];
 795                 }
 796                 DBA::close($gcontacts);
 797
 798                 $apcontacts = DBA::select('apcontact', ['url'], ['baseurl' => [$url, $serverdata['nurl']]]);
 799                 while ($gcontact = DBA::fetch($gcontacts)) {
 800                         $contacts[Strings::normaliseLink($apcontact['url'])] = $apcontact['url'];
 801                 }
 802                 DBA::close($apcontacts);
 803
 804                 $pcontacts = DBA::select('contact', ['url', 'nurl'], ['uid' => 0, 'baseurl' => [$url, $serverdata['nurl']]]);
 805                 while ($gcontact = DBA::fetch($gcontacts)) {
 806                         $contacts[$pcontact['nurl']] = $pcontact['url'];
 807                 }
 808                 DBA::close($pcontacts);
 809
 810                 if (empty($contacts)) {
 811                         return $serverdata;
 812                 }
 813
 814                 foreach ($contacts as $contact) {
 815                         $probed = Probe::uri($contact);
 816                         if (in_array($probed['network'], Protocol::FEDERATED)) {
 817                                 $serverdata['network'] = $probed['network'];
 818                                 break;
 819                         }
 820                 }
 821
 822                 $serverdata['registered-users'] = max($serverdata['registered-users'], count($contacts));
 823
 824                 return $serverdata;
 825         }
 826
 827         /**
 828          * Checks if the given server does have a '/poco' endpoint.
 829          * This is used for the 'PortableContact' functionality,
 830          * which is used by both Friendica and Hubzilla.
 831          *
 832          * @param string $url        URL of the given server
 833          * @param array  $serverdata array with server data
 834          *
 835          * @return array server data
 836          */
 837         private static function checkPoCo(string $url, array $serverdata)
 838         {
 839                 $serverdata['poco'] = '';
 840
 841                 $curlResult = Network::curl($url. '/poco');
 842                 if (!$curlResult->isSuccess()) {
 843                         return $serverdata;
 844                 }
 845
 846                 $data = json_decode($curlResult->getBody(), true);
 847                 if (empty($data)) {
 848                         return $serverdata;
 849                 }
 850
 851                 if (!empty($data['totalResults'])) {
 852                         $registeredUsers = $serverdata['registered-users'] ?? 0;
 853                         $serverdata['registered-users'] = max($data['totalResults'], $registeredUsers);
 854                         $serverdata['directory-type'] = self::DT_POCO;
 855                         $serverdata['poco'] = $url . '/poco';
 856                 }
 857
 858                 return $serverdata;
 859         }
 860
 861         /**
 862          * Checks if the given server does have a Mastodon style directory endpoint.
 863          *
 864          * @param string $url        URL of the given server
 865          * @param array  $serverdata array with server data
 866          *
 867          * @return array server data
 868          */
 869         public static function checkMastodonDirectory(string $url, array $serverdata)
 870         {
 871                 $curlResult = Network::curl($url . '/api/v1/directory?limit=1');
 872                 if (!$curlResult->isSuccess()) {
 873                         return $serverdata;
 874                 }
 875
 876                 $data = json_decode($curlResult->getBody(), true);
 877                 if (empty($data)) {
 878                         return $serverdata;
 879                 }
 880
 881                 if (count($data) == 1) {
 882                         $serverdata['directory-type'] = self::DT_MASTODON;
 883                 }
 884
 885                 return $serverdata;
 886         }
 887
 888         /**
 889          * Detects the version number of a given server when it was a NextCloud installation
 890          *
 891          * @param string $url        URL of the given server
 892          * @param array  $serverdata array with server data
 893          *
 894          * @return array server data
 895          */
 896         private static function detectNextcloud(string $url, array $serverdata)
 897         {
 898                 $curlResult = Network::curl($url . '/status.php');
 899
 900                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 901                         return $serverdata;
 902                 }
 903
 904                 $data = json_decode($curlResult->getBody(), true);
 905                 if (empty($data)) {
 906                         return $serverdata;
 907                 }
 908
 909                 if (!empty($data['version'])) {
 910                         $serverdata['platform'] = 'nextcloud';
 911                         $serverdata['version'] = $data['version'];
 912                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 913                 }
 914
 915                 return $serverdata;
 916         }
 917
 918         /**
 919          * Detects data from a given server url if it was a mastodon alike system
 920          *
 921          * @param string $url        URL of the given server
 922          * @param array  $serverdata array with server data
 923          *
 924          * @return array server data
 925          */
 926         private static function detectMastodonAlikes(string $url, array $serverdata)
 927         {
 928                 $curlResult = Network::curl($url . '/api/v1/instance');
 929
 930                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 931                         return $serverdata;
 932                 }
 933
 934                 $data = json_decode($curlResult->getBody(), true);
 935                 if (empty($data)) {
 936                         return $serverdata;
 937                 }
 938
 939                 if (!empty($data['version'])) {
 940                         $serverdata['platform'] = 'mastodon';
 941                         $serverdata['version'] = $data['version'] ?? '';
 942                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 943                 }
 944
 945                 if (!empty($data['title'])) {
 946                         $serverdata['site_name'] = $data['title'];
 947                 }
 948
 949                 if (!empty($data['title']) && empty($serverdata['platform']) && empty($serverdata['network'])) {
 950                         $serverdata['platform'] = 'mastodon';
 951                         $serverdata['network'] = Protocol::ACTIVITYPUB;
 952                 }
 953
 954                 if (!empty($data['description'])) {
 955                         $serverdata['info'] = trim($data['description']);
 956                 }
 957
 958                 if (!empty($data['stats']['user_count'])) {
 959                         $serverdata['registered-users'] = $data['stats']['user_count'];
 960                 }
 961
 962                 if (!empty($serverdata['version']) && preg_match('/.*?\(compatible;\s(.*)\s(.*)\)/ism', $serverdata['version'], $matches)) {
 963                         $serverdata['platform'] = strtolower($matches[1]);
 964                         $serverdata['version'] = $matches[2];
 965                 }
 966
 967                 if (!empty($serverdata['version']) && strstr(strtolower($serverdata['version']), 'pleroma')) {
 968                         $serverdata['platform'] = 'pleroma';
 969                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
 970                 }
 971
 972                 if (!empty($serverdata['platform']) && strstr($serverdata['platform'], 'pleroma')) {
 973                         $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['platform']));
 974                         $serverdata['platform'] = 'pleroma';
 975                 }
 976
 977                 return $serverdata;
 978         }
 979
 980         /**
 981          * Detects data from typical Hubzilla endpoints
 982          *
 983          * @param string $url        URL of the given server
 984          * @param array  $serverdata array with server data
 985          *
 986          * @return array server data
 987          */
 988         private static function detectHubzilla(string $url, array $serverdata)
 989         {
 990                 $curlResult = Network::curl($url . '/api/statusnet/config.json');
 991                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == '')) {
 992                         return $serverdata;
 993                 }
 994
 995                 $data = json_decode($curlResult->getBody(), true);
 996                 if (empty($data)) {
 997                         return $serverdata;
 998                 }
 999
1000                 if (!empty($data['site']['name'])) {
1001                         $serverdata['site_name'] = $data['site']['name'];
1002                 }
1003
1004                 if (!empty($data['site']['platform'])) {
1005                         $serverdata['platform'] = strtolower($data['site']['platform']['PLATFORM_NAME']);
1006                         $serverdata['version'] = $data['site']['platform']['STD_VERSION'];
1007                         $serverdata['network'] = Protocol::ZOT;
1008                 }
1009
1010                 if (!empty($data['site']['hubzilla'])) {
1011                         $serverdata['platform'] = strtolower($data['site']['hubzilla']['PLATFORM_NAME']);
1012                         $serverdata['version'] = $data['site']['hubzilla']['RED_VERSION'];
1013                         $serverdata['network'] = Protocol::ZOT;
1014                 }
1015
1016                 if (!empty($data['site']['redmatrix'])) {
1017                         if (!empty($data['site']['redmatrix']['PLATFORM_NAME'])) {
1018                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['PLATFORM_NAME']);
1019                         } elseif (!empty($data['site']['redmatrix']['RED_PLATFORM'])) {
1020                                 $serverdata['platform'] = strtolower($data['site']['redmatrix']['RED_PLATFORM']);
1021                         }
1022
1023                         $serverdata['version'] = $data['site']['redmatrix']['RED_VERSION'];
1024                         $serverdata['network'] = Protocol::ZOT;
1025                 }
1026
1027                 $private = false;
1028                 $inviteonly = false;
1029                 $closed = false;
1030
1031                 if (!empty($data['site']['closed'])) {
1032                         $closed = self::toBoolean($data['site']['closed']);
1033                 }
1034
1035                 if (!empty($data['site']['private'])) {
1036                         $private = self::toBoolean($data['site']['private']);
1037                 }
1038
1039                 if (!empty($data['site']['inviteonly'])) {
1040                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1041                 }
1042
1043                 if (!$closed && !$private and $inviteonly) {
1044                         $register_policy = Register::APPROVE;
1045                 } elseif (!$closed && !$private) {
1046                         $register_policy = Register::OPEN;
1047                 } else {
1048                         $register_policy = Register::CLOSED;
1049                 }
1050
1051                 return $serverdata;
1052         }
1053
1054         /**
1055          * Converts input value to a boolean value
1056          *
1057          * @param string|integer $val
1058          *
1059          * @return boolean
1060          */
1061         private static function toBoolean($val)
1062         {
1063                 if (($val == 'true') || ($val == 1)) {
1064                         return true;
1065                 } elseif (($val == 'false') || ($val == 0)) {
1066                         return false;
1067                 }
1068
1069                 return $val;
1070         }
1071
1072         /**
1073          * Detect if the URL belongs to a GNU Social server
1074          *
1075          * @param string $url        URL of the given server
1076          * @param array  $serverdata array with server data
1077          *
1078          * @return array server data
1079          */
1080         private static function detectGNUSocial(string $url, array $serverdata)
1081         {
1082                 // Test for GNU Social
1083                 $curlResult = Network::curl($url . '/api/gnusocial/version.json');
1084                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1085                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1086                         $serverdata['platform'] = 'gnusocial';
1087                         // Remove junk that some GNU Social servers return
1088                         $serverdata['version'] = str_replace(chr(239) . chr(187) . chr(191), '', $curlResult->getBody());
1089                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1090                         $serverdata['version'] = trim($serverdata['version'], '"');
1091                         $serverdata['network'] = Protocol::OSTATUS;
1092                         return $serverdata;
1093                 }
1094
1095                 // Test for Statusnet
1096                 $curlResult = Network::curl($url . '/api/statusnet/version.json');
1097                 if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1098                         ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1099
1100                         // Remove junk that some GNU Social servers return
1101                         $serverdata['version'] = str_replace(chr(239).chr(187).chr(191), '', $curlResult->getBody());
1102                         $serverdata['version'] = str_replace(["\r", "\n", "\t"], '', $serverdata['version']);
1103                         $serverdata['version'] = trim($serverdata['version'], '"');
1104
1105                         if (!empty($serverdata['version']) && strtolower(substr($serverdata['version'], 0, 7)) == 'pleroma') {
1106                                 $serverdata['platform'] = 'pleroma';
1107                                 $serverdata['version'] = trim(str_ireplace('pleroma', '', $serverdata['version']));
1108                                 $serverdata['network'] = Protocol::ACTIVITYPUB;
1109                         } else {
1110                                 $serverdata['platform'] = 'statusnet';
1111                                 $serverdata['network'] = Protocol::OSTATUS;
1112                         }
1113                 }
1114
1115                 return $serverdata;
1116         }
1117
1118         /**
1119          * Detect if the URL belongs to a Friendica server
1120          *
1121          * @param string $url        URL of the given server
1122          * @param array  $serverdata array with server data
1123          *
1124          * @return array server data
1125          */
1126         private static function detectFriendica(string $url, array $serverdata)
1127         {
1128                 $curlResult = Network::curl($url . '/friendica/json');
1129                 if (!$curlResult->isSuccess()) {
1130                         $curlResult = Network::curl($url . '/friendika/json');
1131                 }
1132
1133                 if (!$curlResult->isSuccess()) {
1134                         return $serverdata;
1135                 }
1136
1137                 $data = json_decode($curlResult->getBody(), true);
1138                 if (empty($data) || empty($data['version'])) {
1139                         return $serverdata;
1140                 }
1141
1142                 $serverdata['network'] = Protocol::DFRN;
1143                 $serverdata['version'] = $data['version'];
1144
1145                 if (!empty($data['no_scrape_url'])) {
1146                         $serverdata['noscrape'] = $data['no_scrape_url'];
1147                 }
1148
1149                 if (!empty($data['site_name'])) {
1150                         $serverdata['site_name'] = $data['site_name'];
1151                 }
1152
1153                 if (!empty($data['info'])) {
1154                         $serverdata['info'] = trim($data['info']);
1155                 }
1156
1157                 $register_policy = ($data['register_policy'] ?? '') ?: 'REGISTER_CLOSED';
1158                 switch ($register_policy) {
1159                         case 'REGISTER_OPEN':
1160                                 $serverdata['register_policy'] = Register::OPEN;
1161                                 break;
1162
1163                         case 'REGISTER_APPROVE':
1164                                 $serverdata['register_policy'] = Register::APPROVE;
1165                                 break;
1166
1167                         case 'REGISTER_CLOSED':
1168                         case 'REGISTER_INVITATION':
1169                                 $serverdata['register_policy'] = Register::CLOSED;
1170                                 break;
1171                         default:
1172                                 Logger::info('Register policy is invalid', ['policy' => $register_policy, 'server' => $url]);
1173                                 $serverdata['register_policy'] = Register::CLOSED;
1174                                 break;
1175                 }
1176
1177                 $serverdata['platform'] = strtolower($data['platform'] ?? '');
1178
1179                 return $serverdata;
1180         }
1181
1182         /**
1183          * Analyses the landing page of a given server for hints about type and system of that server
1184          *
1185          * @param object $curlResult result of curl execution
1186          * @param array  $serverdata array with server data
1187          * @param string $url        Server URL
1188          *
1189          * @return array server data
1190          */
1191         private static function analyseRootBody($curlResult, array $serverdata, string $url)
1192         {
1193                 $doc = new DOMDocument();
1194                 @$doc->loadHTML($curlResult->getBody());
1195                 $xpath = new DOMXPath($doc);
1196
1197                 $title = trim(XML::getFirstNodeValue($xpath, '//head/title/text()'));
1198                 if (!empty($title)) {
1199                         $serverdata['site_name'] = $title;
1200                 }
1201
1202                 $list = $xpath->query('//meta[@name]');
1203
1204                 foreach ($list as $node) {
1205                         $attr = [];
1206                         if ($node->attributes->length) {
1207                                 foreach ($node->attributes as $attribute) {
1208                                         $value = trim($attribute->value);
1209                                         if (empty($value)) {
1210                                                 continue;
1211                                         }
1212
1213                                         $attr[$attribute->name] = $value;
1214                                 }
1215
1216                                 if (empty($attr['name']) || empty($attr['content'])) {
1217                                         continue;
1218                                 }
1219                         }
1220
1221                         if ($attr['name'] == 'description') {
1222                                 $serverdata['info'] = $attr['content'];
1223                         }
1224
1225                         if ($attr['name'] == 'application-name') {
1226                                 $serverdata['platform'] = strtolower($attr['content']);
1227                                 if (in_array($attr['content'], ['Misskey', 'Write.as'])) {
1228                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1229                                 }
1230                         }
1231                         if (($attr['name'] == 'generator') && (empty($serverdata['platform']) || (substr(strtolower($attr['content']), 0, 9) == 'wordpress'))) {
1232                                 $serverdata['platform'] = strtolower($attr['content']);
1233                                 $version_part = explode(' ', $attr['content']);
1234
1235                                 if (count($version_part) == 2) {
1236                                         if (in_array($version_part[0], ['WordPress'])) {
1237                                                 $serverdata['platform'] = strtolower($version_part[0]);
1238                                                 $serverdata['version'] = $version_part[1];
1239
1240                                                 // We still do need a reliable test if some AP plugin is activated
1241                                                 if (DBA::exists('apcontact', ['baseurl' => $url])) {
1242                                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1243                                                 } else {
1244                                                         $serverdata['network'] = Protocol::FEED;
1245                                                 }
1246                                         }
1247                                         if (in_array($version_part[0], ['Friendika', 'Friendica'])) {
1248                                                 $serverdata['platform'] = strtolower($version_part[0]);
1249                                                 $serverdata['version'] = $version_part[1];
1250                                                 $serverdata['network'] = Protocol::DFRN;
1251                                         }
1252                                 }
1253                         }
1254                 }
1255
1256                 $list = $xpath->query('//meta[@property]');
1257
1258                 foreach ($list as $node) {
1259                         $attr = [];
1260                         if ($node->attributes->length) {
1261                                 foreach ($node->attributes as $attribute) {
1262                                         $value = trim($attribute->value);
1263                                         if (empty($value)) {
1264                                                 continue;
1265                                         }
1266
1267                                         $attr[$attribute->name] = $value;
1268                                 }
1269
1270                                 if (empty($attr['property']) || empty($attr['content'])) {
1271                                         continue;
1272                                 }
1273                         }
1274
1275                         if ($attr['property'] == 'og:site_name') {
1276                                 $serverdata['site_name'] = $attr['content'];
1277                         }
1278
1279                         if ($attr['property'] == 'og:description') {
1280                                 $serverdata['info'] = $attr['content'];
1281                         }
1282
1283                         if ($attr['property'] == 'og:platform') {
1284                                 $serverdata['platform'] = strtolower($attr['content']);
1285
1286                                 if (in_array($attr['content'], ['PeerTube'])) {
1287                                         $serverdata['network'] = Protocol::ACTIVITYPUB;
1288                                 }
1289                         }
1290
1291                         if ($attr['property'] == 'generator') {
1292                                 $serverdata['platform'] = strtolower($attr['content']);
1293
1294                                 if (in_array($attr['content'], ['hubzilla'])) {
1295                                         // We later check which compatible protocol modules are loaded.
1296                                         $serverdata['network'] = Protocol::ZOT;
1297                                 }
1298                         }
1299                 }
1300
1301                 return $serverdata;
1302         }
1303
1304         /**
1305          * Analyses the header data of a given server for hints about type and system of that server
1306          *
1307          * @param object $curlResult result of curl execution
1308          * @param array  $serverdata array with server data
1309          *
1310          * @return array server data
1311          */
1312         private static function analyseRootHeader($curlResult, array $serverdata)
1313         {
1314                 if ($curlResult->getHeader('server') == 'Mastodon') {
1315                         $serverdata['platform'] = 'mastodon';
1316                         $serverdata['network'] = $network = Protocol::ACTIVITYPUB;
1317                 } elseif ($curlResult->inHeader('x-diaspora-version')) {
1318                         $serverdata['platform'] = 'diaspora';
1319                         $serverdata['network'] = $network = Protocol::DIASPORA;
1320                         $serverdata['version'] = $curlResult->getHeader('x-diaspora-version');
1321                 } elseif ($curlResult->inHeader('x-friendica-version')) {
1322                         $serverdata['platform'] = 'friendica';
1323                         $serverdata['network'] = $network = Protocol::DFRN;
1324                         $serverdata['version'] = $curlResult->getHeader('x-friendica-version');
1325                 }
1326                 return $serverdata;
1327         }
1328
1329         /**
1330          * Test if the body contains valid content
1331          *
1332          * @param string $body
1333          * @return boolean
1334          */
1335         private static function invalidBody(string $body)
1336         {
1337                 // Currently we only test for a HTML element.
1338                 // Possibly we enhance this in the future.
1339                 return !strpos($body, '>');
1340         }
1341
1342         /**
1343          * Update the user directory of a given gserver record
1344          *
1345          * @param array $gserver gserver record
1346          */
1347         public static function updateDirectory(array $gserver)
1348         {
1349                 /// @todo Add Mastodon API directory
1350
1351                 if (!empty($gserver['poco'])) {
1352                         PortableContact::discoverSingleServer($gserver['id']);
1353                 }
1354         }
1355
1356         /**
1357          * Update GServer entries
1358          */
1359         public static function discover()
1360         {
1361                 // Update the server list
1362                 self::discoverFederation();
1363
1364                 $no_of_queries = 5;
1365
1366                 $requery_days = intval(DI::config()->get('system', 'poco_requery_days'));
1367
1368                 if ($requery_days == 0) {
1369                         $requery_days = 7;
1370                 }
1371
1372                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1373
1374                 $gservers = DBA::p("SELECT `id`, `url`, `nurl`, `network`, `poco`
1375                         FROM `gserver`
1376                         WHERE `last_contact` >= `last_failure`
1377                         AND `poco` != ''
1378                         AND `last_poco_query` < ?
1379                         ORDER BY RAND()", $last_update
1380                 );
1381
1382                 while ($gserver = DBA::fetch($gservers)) {
1383                         if (!GServer::check($gserver['url'], $gserver['network'])) {
1384                                 // The server is not reachable? Okay, then we will try it later
1385                                 $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1386                                 DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1387                                 continue;
1388                         }
1389
1390                         Logger::info('Update directory', ['server' => $gserver['url'], 'id' => $gserver['id']]);
1391                         Worker::add(PRIORITY_LOW, 'UpdateServerDirectory', $gserver);
1392
1393                         if (--$no_of_queries == 0) {
1394                                 break;
1395                         }
1396                 }
1397
1398                 DBA::close($gservers);
1399         }
1400
1401         /**
1402          * Discover federated servers
1403          */
1404         private static function discoverFederation()
1405         {
1406                 $last = DI::config()->get('poco', 'last_federation_discovery');
1407
1408                 if ($last) {
1409                         $next = $last + (24 * 60 * 60);
1410
1411                         if ($next > time()) {
1412                                 return;
1413                         }
1414                 }
1415
1416                 // Discover federated servers
1417                 $curlResult = Network::fetchUrl("http://the-federation.info/pods.json");
1418
1419                 if (!empty($curlResult)) {
1420                         $servers = json_decode($curlResult, true);
1421
1422                         if (!empty($servers['pods'])) {
1423                                 foreach ($servers['pods'] as $server) {
1424                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', 'https://' . $server['host']);
1425                                 }
1426                         }
1427                 }
1428
1429                 // Disvover Mastodon servers
1430                 $accesstoken = DI::config()->get('system', 'instances_social_key');
1431
1432                 if (!empty($accesstoken)) {
1433                         $api = 'https://instances.social/api/1.0/instances/list?count=0';
1434                         $header = ['Authorization: Bearer '.$accesstoken];
1435                         $curlResult = Network::curl($api, false, ['headers' => $header]);
1436
1437                         if ($curlResult->isSuccess()) {
1438                                 $servers = json_decode($curlResult->getBody(), true);
1439
1440                                 foreach ($servers['instances'] as $server) {
1441                                         $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1442                                         Worker::add(PRIORITY_LOW, 'UpdateGServer', $url);
1443                                 }
1444                         }
1445                 }
1446
1447                 DI::config()->set('poco', 'last_federation_discovery', time());
1448         }
1449 }