src/Protocol/PortableContact.php

   1 <?php
   2 /**
   3  * @file src/Protocol/PortableContact.php
   4  *
   5  * @todo Move GNU Social URL schemata (http://server.tld/user/number) to http://server.tld/username
   6  * @todo Fetch profile data from profile page for Redmatrix users
   7  * @todo Detect if it is a forum
   8  */
   9
  10 namespace Friendica\Protocol;
  11
  12 use DOMDocument;
  13 use DOMXPath;
  14 use Exception;
  15 use Friendica\Content\Text\HTML;
  16 use Friendica\Core\Config;
  17 use Friendica\Core\Logger;
  18 use Friendica\Core\Protocol;
  19 use Friendica\Core\Worker;
  20 use Friendica\Database\DBA;
  21 use Friendica\Model\GContact;
  22 use Friendica\Model\Profile;
  23 use Friendica\Network\Probe;
  24 use Friendica\Util\DateTimeFormat;
  25 use Friendica\Util\Network;
  26 use Friendica\Util\Strings;
  27 use Friendica\Util\XML;
  28
  29 require_once 'include/dba.php';
  30
  31 class PortableContact
  32 {
  33         /**
  34          * @brief Fetch POCO data
  35          *
  36          * @param integer $cid  Contact ID
  37          * @param integer $uid  User ID
  38          * @param integer $zcid Global Contact ID
  39          * @param integer $url  POCO address that should be polled
  40          *
  41          * Given a contact-id (minimum), load the PortableContacts friend list for that contact,
  42          * and add the entries to the gcontact (Global Contact) table, or update existing entries
  43          * if anything (name or photo) has changed.
  44          * We use normalised urls for comparison which ignore http vs https and www.domain vs domain
  45          *
  46          * Once the global contact is stored add (if necessary) the contact linkage which associates
  47          * the given uid, cid to the global contact entry. There can be many uid/cid combinations
  48          * pointing to the same global contact id.
  49          *
  50          */
  51         public static function loadWorker($cid, $uid = 0, $zcid = 0, $url = null)
  52         {
  53                 // Call the function "load" via the worker
  54                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "load", (int)$cid, (int)$uid, (int)$zcid, $url);
  55         }
  56
  57         /**
  58          * @brief Fetch POCO data from the worker
  59          *
  60          * @param integer $cid  Contact ID
  61          * @param integer $uid  User ID
  62          * @param integer $zcid Global Contact ID
  63          * @param integer $url  POCO address that should be polled
  64          *
  65          */
  66         public static function load($cid, $uid, $zcid, $url)
  67         {
  68                 $a = get_app();
  69
  70                 if ($cid) {
  71                         if (!$url || !$uid) {
  72                                 $contact = DBA::selectFirst('contact', ['poco', 'uid'], ['id' => $cid]);
  73                                 if (DBA::isResult($contact)) {
  74                                         $url = $contact['poco'];
  75                                         $uid = $contact['uid'];
  76                                 }
  77                         }
  78                         if (!$uid) {
  79                                 return;
  80                         }
  81                 }
  82
  83                 if (!$url) {
  84                         return;
  85                 }
  86
  87                 $url = $url . (($uid) ? '/@me/@all?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation' : '?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation');
  88
  89                 Logger::log('load: ' . $url, Logger::DEBUG);
  90
  91                 $fetchresult = Network::fetchUrlFull($url);
  92                 $s = $fetchresult->getBody();
  93
  94                 Logger::log('load: returns ' . $s, Logger::DATA);
  95
  96                 Logger::log('load: return code: ' . $fetchresult->getReturnCode(), Logger::DEBUG);
  97
  98                 if (($fetchresult->getReturnCode() > 299) || (! $s)) {
  99                         return;
 100                 }
 101
 102                 $j = json_decode($s, true);
 103
 104                 Logger::log('load: json: ' . print_r($j, true), Logger::DATA);
 105
 106                 if (!isset($j['entry'])) {
 107                         return;
 108                 }
 109
 110                 $total = 0;
 111                 foreach ($j['entry'] as $entry) {
 112                         $total ++;
 113                         $profile_url = '';
 114                         $profile_photo = '';
 115                         $connect_url = '';
 116                         $name = '';
 117                         $network = '';
 118                         $updated = DBA::NULL_DATETIME;
 119                         $location = '';
 120                         $about = '';
 121                         $keywords = '';
 122                         $gender = '';
 123                         $contact_type = -1;
 124                         $generation = 0;
 125
 126                         if (!empty($entry['displayName'])) {
 127                                 $name = $entry['displayName'];
 128                         }
 129
 130                         if (isset($entry['urls'])) {
 131                                 foreach ($entry['urls'] as $url) {
 132                                         if ($url['type'] == 'profile') {
 133                                                 $profile_url = $url['value'];
 134                                                 continue;
 135                                         }
 136                                         if ($url['type'] == 'webfinger') {
 137                                                 $connect_url = str_replace('acct:', '', $url['value']);
 138                                                 continue;
 139                                         }
 140                                 }
 141                         }
 142                         if (isset($entry['photos'])) {
 143                                 foreach ($entry['photos'] as $photo) {
 144                                         if ($photo['type'] == 'profile') {
 145                                                 $profile_photo = $photo['value'];
 146                                                 continue;
 147                                         }
 148                                 }
 149                         }
 150
 151                         if (isset($entry['updated'])) {
 152                                 $updated = date(DateTimeFormat::MYSQL, strtotime($entry['updated']));
 153                         }
 154
 155                         if (isset($entry['network'])) {
 156                                 $network = $entry['network'];
 157                         }
 158
 159                         if (isset($entry['currentLocation'])) {
 160                                 $location = $entry['currentLocation'];
 161                         }
 162
 163                         if (isset($entry['aboutMe'])) {
 164                                 $about = HTML::toBBCode($entry['aboutMe']);
 165                         }
 166
 167                         if (isset($entry['gender'])) {
 168                                 $gender = $entry['gender'];
 169                         }
 170
 171                         if (isset($entry['generation']) && ($entry['generation'] > 0)) {
 172                                 $generation = ++$entry['generation'];
 173                         }
 174
 175                         if (isset($entry['tags'])) {
 176                                 foreach ($entry['tags'] as $tag) {
 177                                         $keywords = implode(", ", $tag);
 178                                 }
 179                         }
 180
 181                         if (isset($entry['contactType']) && ($entry['contactType'] >= 0)) {
 182                                 $contact_type = $entry['contactType'];
 183                         }
 184
 185                         $gcontact = ["url" => $profile_url,
 186                                         "name" => $name,
 187                                         "network" => $network,
 188                                         "photo" => $profile_photo,
 189                                         "about" => $about,
 190                                         "location" => $location,
 191                                         "gender" => $gender,
 192                                         "keywords" => $keywords,
 193                                         "connect" => $connect_url,
 194                                         "updated" => $updated,
 195                                         "contact-type" => $contact_type,
 196                                         "generation" => $generation];
 197
 198                         try {
 199                                 $gcontact = GContact::sanitize($gcontact);
 200                                 $gcid = GContact::update($gcontact);
 201
 202                                 GContact::link($gcid, $uid, $cid, $zcid);
 203                         } catch (Exception $e) {
 204                                 Logger::log($e->getMessage(), Logger::DEBUG);
 205                         }
 206                 }
 207                 Logger::log("load: loaded $total entries", Logger::DEBUG);
 208
 209                 $condition = ["`cid` = ? AND `uid` = ? AND `zcid` = ? AND `updated` < UTC_TIMESTAMP - INTERVAL 2 DAY", $cid, $uid, $zcid];
 210                 DBA::delete('glink', $condition);
 211         }
 212
 213         public static function reachable($profile, $server = "", $network = "", $force = false)
 214         {
 215                 if ($server == "") {
 216                         $server = self::detectServer($profile);
 217                 }
 218
 219                 if ($server == "") {
 220                         return true;
 221                 }
 222
 223                 return self::checkServer($server, $network, $force);
 224         }
 225
 226         public static function detectServer($profile)
 227         {
 228                 // Try to detect the server path based upon some known standard paths
 229                 $server_url = "";
 230
 231                 if ($server_url == "") {
 232                         $friendica = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $profile);
 233                         if ($friendica != $profile) {
 234                                 $server_url = $friendica;
 235                                 $network = Protocol::DFRN;
 236                         }
 237                 }
 238
 239                 if ($server_url == "") {
 240                         $diaspora = preg_replace("=(https?://)(.*)/u/(.*)=ism", "$1$2", $profile);
 241                         if ($diaspora != $profile) {
 242                                 $server_url = $diaspora;
 243                                 $network = Protocol::DIASPORA;
 244                         }
 245                 }
 246
 247                 if ($server_url == "") {
 248                         $red = preg_replace("=(https?://)(.*)/channel/(.*)=ism", "$1$2", $profile);
 249                         if ($red != $profile) {
 250                                 $server_url = $red;
 251                                 $network = Protocol::DIASPORA;
 252                         }
 253                 }
 254
 255                 // Mastodon
 256                 if ($server_url == "") {
 257                         $mastodon = preg_replace("=(https?://)(.*)/users/(.*)=ism", "$1$2", $profile);
 258                         if ($mastodon != $profile) {
 259                                 $server_url = $mastodon;
 260                                 $network = Protocol::OSTATUS;
 261                         }
 262                 }
 263
 264                 // Numeric OStatus variant
 265                 if ($server_url == "") {
 266                         $ostatus = preg_replace("=(https?://)(.*)/user/(.*)=ism", "$1$2", $profile);
 267                         if ($ostatus != $profile) {
 268                                 $server_url = $ostatus;
 269                                 $network = Protocol::OSTATUS;
 270                         }
 271                 }
 272
 273                 // Wild guess
 274                 if ($server_url == "") {
 275                         $base = preg_replace("=(https?://)(.*?)/(.*)=ism", "$1$2", $profile);
 276                         if ($base != $profile) {
 277                                 $server_url = $base;
 278                                 $network = Protocol::PHANTOM;
 279                         }
 280                 }
 281
 282                 if ($server_url == "") {
 283                         return "";
 284                 }
 285
 286                 $r = q(
 287                         "SELECT `id` FROM `gserver` WHERE `nurl` = '%s' AND `last_contact` > `last_failure`",
 288                         DBA::escape(Strings::normaliseLink($server_url))
 289                 );
 290
 291                 if (DBA::isResult($r)) {
 292                         return $server_url;
 293                 }
 294
 295                 // Fetch the host-meta to check if this really is a server
 296                 $curlResult = Network::curl($server_url."/.well-known/host-meta");
 297                 if (!$curlResult->isSuccess()) {
 298                         return "";
 299                 }
 300
 301                 return $server_url;
 302         }
 303
 304         public static function alternateOStatusUrl($url)
 305         {
 306                 return(preg_match("=https?://.+/user/\d+=ism", $url, $matches));
 307         }
 308
 309         public static function lastUpdated($profile, $force = false)
 310         {
 311                 $gcontacts = q(
 312                         "SELECT * FROM `gcontact` WHERE `nurl` = '%s'",
 313                         DBA::escape(Strings::normaliseLink($profile))
 314                 );
 315
 316                 if (!DBA::isResult($gcontacts)) {
 317                         return false;
 318                 }
 319
 320                 $contact = ["url" => $profile];
 321
 322                 if ($gcontacts[0]["created"] <= DBA::NULL_DATETIME) {
 323                         $contact['created'] = DateTimeFormat::utcNow();
 324                 }
 325
 326                 $server_url = '';
 327                 if ($force) {
 328                         $server_url = Strings::normaliseLink(self::detectServer($profile));
 329                 }
 330
 331                 if (($server_url == '') && ($gcontacts[0]["server_url"] != "")) {
 332                         $server_url = $gcontacts[0]["server_url"];
 333                 }
 334
 335                 if (!$force && (($server_url == '') || ($gcontacts[0]["server_url"] == $gcontacts[0]["nurl"]))) {
 336                         $server_url = Strings::normaliseLink(self::detectServer($profile));
 337                 }
 338
 339                 if (!in_array($gcontacts[0]["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::FEED, Protocol::OSTATUS, ""])) {
 340                         Logger::log("Profile ".$profile.": Network type ".$gcontacts[0]["network"]." can't be checked", Logger::DEBUG);
 341                         return false;
 342                 }
 343
 344                 if ($server_url != "") {
 345                         if (!self::checkServer($server_url, $gcontacts[0]["network"], $force)) {
 346                                 if ($force) {
 347                                         $fields = ['last_failure' => DateTimeFormat::utcNow()];
 348                                         DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 349                                 }
 350
 351                                 Logger::log("Profile ".$profile.": Server ".$server_url." wasn't reachable.", Logger::DEBUG);
 352                                 return false;
 353                         }
 354                         $contact['server_url'] = $server_url;
 355                 }
 356
 357                 if (in_array($gcontacts[0]["network"], ["", Protocol::FEED])) {
 358                         $server = q(
 359                                 "SELECT `network` FROM `gserver` WHERE `nurl` = '%s' AND `network` != ''",
 360                                 DBA::escape(Strings::normaliseLink($server_url))
 361                         );
 362
 363                         if ($server) {
 364                                 $contact['network'] = $server[0]["network"];
 365                         } else {
 366                                 return false;
 367                         }
 368                 }
 369
 370                 // noscrape is really fast so we don't cache the call.
 371                 if (($server_url != "") && ($gcontacts[0]["nick"] != "")) {
 372                         //  Use noscrape if possible
 373                         $server = q("SELECT `noscrape`, `network` FROM `gserver` WHERE `nurl` = '%s' AND `noscrape` != ''", DBA::escape(Strings::normaliseLink($server_url)));
 374
 375                         if ($server) {
 376                                 $curlResult = Network::curl($server[0]["noscrape"]."/".$gcontacts[0]["nick"]);
 377
 378                                 if ($curlResult->isSuccess() && ($curlResult->getBody() != "")) {
 379                                         $noscrape = json_decode($curlResult->getBody(), true);
 380
 381                                         if (is_array($noscrape)) {
 382                                                 $contact["network"] = $server[0]["network"];
 383
 384                                                 if (isset($noscrape["fn"])) {
 385                                                         $contact["name"] = $noscrape["fn"];
 386                                                 }
 387                                                 if (isset($noscrape["comm"])) {
 388                                                         $contact["community"] = $noscrape["comm"];
 389                                                 }
 390                                                 if (isset($noscrape["tags"])) {
 391                                                         $keywords = implode(" ", $noscrape["tags"]);
 392                                                         if ($keywords != "") {
 393                                                                 $contact["keywords"] = $keywords;
 394                                                         }
 395                                                 }
 396
 397                                                 $location = Profile::formatLocation($noscrape);
 398                                                 if ($location) {
 399                                                         $contact["location"] = $location;
 400                                                 }
 401                                                 if (isset($noscrape["dfrn-notify"])) {
 402                                                         $contact["notify"] = $noscrape["dfrn-notify"];
 403                                                 }
 404                                                 // Remove all fields that are not present in the gcontact table
 405                                                 unset($noscrape["fn"]);
 406                                                 unset($noscrape["key"]);
 407                                                 unset($noscrape["homepage"]);
 408                                                 unset($noscrape["comm"]);
 409                                                 unset($noscrape["tags"]);
 410                                                 unset($noscrape["locality"]);
 411                                                 unset($noscrape["region"]);
 412                                                 unset($noscrape["country-name"]);
 413                                                 unset($noscrape["contacts"]);
 414                                                 unset($noscrape["dfrn-request"]);
 415                                                 unset($noscrape["dfrn-confirm"]);
 416                                                 unset($noscrape["dfrn-notify"]);
 417                                                 unset($noscrape["dfrn-poll"]);
 418
 419                                                 // Set the date of the last contact
 420                                                 /// @todo By now the function "update_gcontact" doesn't work with this field
 421                                                 //$contact["last_contact"] = DateTimeFormat::utcNow();
 422
 423                                                 $contact = array_merge($contact, $noscrape);
 424
 425                                                 GContact::update($contact);
 426
 427                                                 if (!empty($noscrape["updated"])) {
 428                                                         $fields = ['last_contact' => DateTimeFormat::utcNow()];
 429                                                         DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 430
 431                                                         Logger::log("Profile ".$profile." was last updated at ".$noscrape["updated"]." (noscrape)", Logger::DEBUG);
 432
 433                                                         return $noscrape["updated"];
 434                                                 }
 435                                         }
 436                                 }
 437                         }
 438                 }
 439
 440                 // If we only can poll the feed, then we only do this once a while
 441                 if (!$force && !self::updateNeeded($gcontacts[0]["created"], $gcontacts[0]["updated"], $gcontacts[0]["last_failure"], $gcontacts[0]["last_contact"])) {
 442                         Logger::log("Profile ".$profile." was last updated at ".$gcontacts[0]["updated"]." (cached)", Logger::DEBUG);
 443
 444                         GContact::update($contact);
 445                         return $gcontacts[0]["updated"];
 446                 }
 447
 448                 $data = Probe::uri($profile);
 449
 450                 // Is the profile link the alternate OStatus link notation? (http://domain.tld/user/4711)
 451                 // Then check the other link and delete this one
 452                 if (($data["network"] == Protocol::OSTATUS) && self::alternateOStatusUrl($profile)
 453                         && (Strings::normaliseLink($profile) == Strings::normaliseLink($data["alias"]))
 454                         && (Strings::normaliseLink($profile) != Strings::normaliseLink($data["url"]))
 455                 ) {
 456                         // Delete the old entry
 457                         DBA::delete('gcontact', ['nurl' => Strings::normaliseLink($profile)]);
 458
 459                         $gcontact = array_merge($gcontacts[0], $data);
 460
 461                         $gcontact["server_url"] = $data["baseurl"];
 462
 463                         try {
 464                                 $gcontact = GContact::sanitize($gcontact);
 465                                 GContact::update($gcontact);
 466
 467                                 self::lastUpdated($data["url"], $force);
 468                         } catch (Exception $e) {
 469                                 Logger::log($e->getMessage(), Logger::DEBUG);
 470                         }
 471
 472                         Logger::log("Profile ".$profile." was deleted", Logger::DEBUG);
 473                         return false;
 474                 }
 475
 476                 if (($data["poll"] == "") || (in_array($data["network"], [Protocol::FEED, Protocol::PHANTOM]))) {
 477                         $fields = ['last_failure' => DateTimeFormat::utcNow()];
 478                         DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 479
 480                         Logger::log("Profile ".$profile." wasn't reachable (profile)", Logger::DEBUG);
 481                         return false;
 482                 }
 483
 484                 $contact = array_merge($contact, $data);
 485
 486                 $contact["server_url"] = $data["baseurl"];
 487
 488                 GContact::update($contact);
 489
 490                 $curlResult = Network::curl($data["poll"]);
 491
 492                 if (!$curlResult->isSuccess()) {
 493                         $fields = ['last_failure' => DateTimeFormat::utcNow()];
 494                         DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 495
 496                         Logger::log("Profile ".$profile." wasn't reachable (no feed)", Logger::DEBUG);
 497                         return false;
 498                 }
 499
 500                 $doc = new DOMDocument();
 501                 /// @TODO Avoid error supression here
 502                 @$doc->loadXML($curlResult->getBody());
 503
 504                 $xpath = new DOMXPath($doc);
 505                 $xpath->registerNamespace('atom', "http://www.w3.org/2005/Atom");
 506
 507                 $entries = $xpath->query('/atom:feed/atom:entry');
 508
 509                 $last_updated = "";
 510
 511                 foreach ($entries as $entry) {
 512                         $published = DateTimeFormat::utc($xpath->query('atom:published/text()', $entry)->item(0)->nodeValue);
 513                         $updated   = DateTimeFormat::utc($xpath->query('atom:updated/text()'  , $entry)->item(0)->nodeValue);
 514
 515                         if ($last_updated < $published) {
 516                                 $last_updated = $published;
 517                         }
 518
 519                         if ($last_updated < $updated) {
 520                                 $last_updated = $updated;
 521                         }
 522                 }
 523
 524                 // Maybe there aren't any entries. Then check if it is a valid feed
 525                 if ($last_updated == "") {
 526                         if ($xpath->query('/atom:feed')->length > 0) {
 527                                 $last_updated = DBA::NULL_DATETIME;
 528                         }
 529                 }
 530
 531                 $fields = ['last_contact' => DateTimeFormat::utcNow()];
 532
 533                 if (!empty($last_updated)) {
 534                         $fields['updated'] = $last_updated;
 535                 }
 536
 537                 DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 538
 539                 if (($gcontacts[0]["generation"] == 0)) {
 540                         $fields = ['generation' => 9];
 541                         DBA::update('gcontact', $fields, ['nurl' => Strings::normaliseLink($profile)]);
 542                 }
 543
 544                 Logger::log("Profile ".$profile." was last updated at ".$last_updated, Logger::DEBUG);
 545
 546                 return $last_updated;
 547         }
 548
 549         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 550         {
 551                 $now = strtotime(DateTimeFormat::utcNow());
 552
 553                 if ($updated > $last_contact) {
 554                         $contact_time = strtotime($updated);
 555                 } else {
 556                         $contact_time = strtotime($last_contact);
 557                 }
 558
 559                 $failure_time = strtotime($last_failure);
 560                 $created_time = strtotime($created);
 561
 562                 // If there is no "created" time then use the current time
 563                 if ($created_time <= 0) {
 564                         $created_time = $now;
 565                 }
 566
 567                 // If the last contact was less than 24 hours then don't update
 568                 if (($now - $contact_time) < (60 * 60 * 24)) {
 569                         return false;
 570                 }
 571
 572                 // If the last failure was less than 24 hours then don't update
 573                 if (($now - $failure_time) < (60 * 60 * 24)) {
 574                         return false;
 575                 }
 576
 577                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 578                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 579                 //      return false;
 580
 581                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 582                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 583                         return false;
 584                 }
 585
 586                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 587                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 588                         return false;
 589                 }
 590
 591                 return true;
 592         }
 593
 594         /// @TODO Maybe move this out to an utilities class?
 595         private static function toBoolean($val)
 596         {
 597                 if (($val == "true") || ($val == 1)) {
 598                         return true;
 599                 } elseif (($val == "false") || ($val == 0)) {
 600                         return false;
 601                 }
 602
 603                 return $val;
 604         }
 605
 606         /**
 607          * @brief Detect server type (Hubzilla or Friendica) via the poco data
 608          *
 609          * @param array $data POCO data
 610          * @return array Server data
 611          */
 612         private static function detectPocoData(array $data)
 613         {
 614                 $server = false;
 615
 616                 if (!isset($data['entry'])) {
 617                         return false;
 618                 }
 619
 620                 if (count($data['entry']) == 0) {
 621                         return false;
 622                 }
 623
 624                 if (!isset($data['entry'][0]['urls'])) {
 625                         return false;
 626                 }
 627
 628                 if (count($data['entry'][0]['urls']) == 0) {
 629                         return false;
 630                 }
 631
 632                 foreach ($data['entry'][0]['urls'] as $url) {
 633                         if ($url['type'] == 'zot') {
 634                                 $server = [];
 635                                 $server["platform"] = 'Hubzilla';
 636                                 $server["network"] = Protocol::DIASPORA;
 637                                 return $server;
 638                         }
 639                 }
 640                 return false;
 641         }
 642
 643         /**
 644          * @brief Detect server type by using the nodeinfo data
 645          *
 646          * @param string $server_url address of the server
 647          * @return array Server data
 648          */
 649         private static function fetchNodeinfo($server_url)
 650         {
 651                 $curlResult = Network::curl($server_url."/.well-known/nodeinfo");
 652                 if (!$curlResult->isSuccess()) {
 653                         return false;
 654                 }
 655
 656                 $nodeinfo = json_decode($curlResult->getBody(), true);
 657
 658                 if (!is_array($nodeinfo) || !isset($nodeinfo['links'])) {
 659                         return false;
 660                 }
 661
 662                 $nodeinfo1_url = '';
 663                 $nodeinfo2_url = '';
 664
 665                 foreach ($nodeinfo['links'] as $link) {
 666                         if (!is_array($link) || empty($link['rel'])) {
 667                                 Logger::log('Invalid nodeinfo format for ' . $server_url, Logger::DEBUG);
 668                                 continue;
 669                         }
 670                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 671                                 $nodeinfo1_url = $link['href'];
 672                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 673                                 $nodeinfo2_url = $link['href'];
 674                         }
 675                 }
 676
 677                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 678                         return false;
 679                 }
 680
 681                 $server = [];
 682
 683                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 684                 if (!empty($nodeinfo2_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 685                         $server = self::parseNodeinfo2($nodeinfo2_url);
 686                 }
 687
 688                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 689                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 690                         $server = self::parseNodeinfo1($nodeinfo1_url);
 691                 }
 692
 693                 return $server;
 694         }
 695
 696         /**
 697          * @brief Parses Nodeinfo 1
 698          *
 699          * @param string $nodeinfo_url address of the nodeinfo path
 700          * @return array Server data
 701          */
 702         private static function parseNodeinfo1($nodeinfo_url)
 703         {
 704                 $curlResult = Network::curl($nodeinfo_url);
 705
 706                 if (!$curlResult->isSuccess()) {
 707                         return false;
 708                 }
 709
 710                 $nodeinfo = json_decode($curlResult->getBody(), true);
 711
 712                 if (!is_array($nodeinfo)) {
 713                         return false;
 714                 }
 715
 716                 $server = [];
 717
 718                 $server['register_policy'] = REGISTER_CLOSED;
 719
 720                 if (is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
 721                         $server['register_policy'] = REGISTER_OPEN;
 722                 }
 723
 724                 if (is_array($nodeinfo['software'])) {
 725                         if (isset($nodeinfo['software']['name'])) {
 726                                 $server['platform'] = $nodeinfo['software']['name'];
 727                         }
 728
 729                         if (isset($nodeinfo['software']['version'])) {
 730                                 $server['version'] = $nodeinfo['software']['version'];
 731                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 732                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 733                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 734                         }
 735                 }
 736
 737                 if (isset($nodeinfo['metadata']['nodeName'])) {
 738                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 739                 }
 740
 741                 if (!empty($nodeinfo['usage']['users']['total'])) {
 742                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 743                 }
 744
 745                 $diaspora = false;
 746                 $friendica = false;
 747                 $gnusocial = false;
 748
 749                 if (is_array($nodeinfo['protocols']['inbound'])) {
 750                         foreach ($nodeinfo['protocols']['inbound'] as $inbound) {
 751                                 if ($inbound == 'diaspora') {
 752                                         $diaspora = true;
 753                                 }
 754                                 if ($inbound == 'friendica') {
 755                                         $friendica = true;
 756                                 }
 757                                 if ($inbound == 'gnusocial') {
 758                                         $gnusocial = true;
 759                                 }
 760                         }
 761                 }
 762
 763                 if ($gnusocial) {
 764                         $server['network'] = Protocol::OSTATUS;
 765                 }
 766                 if ($diaspora) {
 767                         $server['network'] = Protocol::DIASPORA;
 768                 }
 769                 if ($friendica) {
 770                         $server['network'] = Protocol::DFRN;
 771                 }
 772
 773                 if (!$server) {
 774                         return false;
 775                 }
 776
 777                 return $server;
 778         }
 779
 780         /**
 781          * @brief Parses Nodeinfo 2
 782          *
 783          * @param string $nodeinfo_url address of the nodeinfo path
 784          * @return array Server data
 785          */
 786         private static function parseNodeinfo2($nodeinfo_url)
 787         {
 788                 $curlResult = Network::curl($nodeinfo_url);
 789                 if (!$curlResult->isSuccess()) {
 790                         return false;
 791                 }
 792
 793                 $nodeinfo = json_decode($curlResult->getBody(), true);
 794
 795                 if (!is_array($nodeinfo)) {
 796                         return false;
 797                 }
 798
 799                 $server = [];
 800
 801                 $server['register_policy'] = REGISTER_CLOSED;
 802
 803                 if (is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
 804                         $server['register_policy'] = REGISTER_OPEN;
 805                 }
 806
 807                 if (is_array($nodeinfo['software'])) {
 808                         if (isset($nodeinfo['software']['name'])) {
 809                                 $server['platform'] = $nodeinfo['software']['name'];
 810                         }
 811
 812                         if (isset($nodeinfo['software']['version'])) {
 813                                 $server['version'] = $nodeinfo['software']['version'];
 814                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 815                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 816                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 817                         }
 818                 }
 819
 820                 if (isset($nodeinfo['metadata']['nodeName'])) {
 821                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 822                 }
 823
 824                 if (!empty($nodeinfo['usage']['users']['total'])) {
 825                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 826                 }
 827
 828                 $diaspora = false;
 829                 $friendica = false;
 830                 $gnusocial = false;
 831
 832                 if (!empty($nodeinfo['protocols'])) {
 833                         foreach ($nodeinfo['protocols'] as $protocol) {
 834                                 if ($protocol == 'diaspora') {
 835                                         $diaspora = true;
 836                                 } elseif ($protocol == 'friendica') {
 837                                         $friendica = true;
 838                                 } elseif ($protocol == 'gnusocial') {
 839                                         $gnusocial = true;
 840                                 }
 841                         }
 842                 }
 843
 844                 if ($gnusocial) {
 845                         $server['network'] = Protocol::OSTATUS;
 846                 } elseif ($diaspora) {
 847                         $server['network'] = Protocol::DIASPORA;
 848                 } elseif ($friendica) {
 849                         $server['network'] = Protocol::DFRN;
 850                 }
 851
 852                 if (empty($server)) {
 853                         return false;
 854                 }
 855
 856                 return $server;
 857         }
 858
 859         /**
 860          * @brief Detect server type (Hubzilla or Friendica) via the front page body
 861          *
 862          * @param string $body Front page of the server
 863          * @return array Server data
 864          */
 865         private static function detectServerType($body)
 866         {
 867                 $server = false;
 868
 869                 $doc = new DOMDocument();
 870                 /// @TODO Acoid supressing error
 871                 @$doc->loadHTML($body);
 872                 $xpath = new DOMXPath($doc);
 873
 874                 $list = $xpath->query("//meta[@name]");
 875
 876                 foreach ($list as $node) {
 877                         $attr = [];
 878                         if ($node->attributes->length) {
 879                                 foreach ($node->attributes as $attribute) {
 880                                         $attr[$attribute->name] = $attribute->value;
 881                                 }
 882                         }
 883                         if ($attr['name'] == 'generator') {
 884                                 $version_part = explode(" ", $attr['content']);
 885                                 if (count($version_part) == 2) {
 886                                         if (in_array($version_part[0], ["Friendika", "Friendica"])) {
 887                                                 $server = [];
 888                                                 $server["platform"] = $version_part[0];
 889                                                 $server["version"] = $version_part[1];
 890                                                 $server["network"] = Protocol::DFRN;
 891                                         }
 892                                 }
 893                         }
 894                 }
 895
 896                 if (!$server) {
 897                         $list = $xpath->query("//meta[@property]");
 898
 899                         foreach ($list as $node) {
 900                                 $attr = [];
 901                                 if ($node->attributes->length) {
 902                                         foreach ($node->attributes as $attribute) {
 903                                                 $attr[$attribute->name] = $attribute->value;
 904                                         }
 905                                 }
 906                                 if ($attr['property'] == 'generator' && in_array($attr['content'], ["hubzilla", "BlaBlaNet"])) {
 907                                         $server = [];
 908                                         $server["platform"] = $attr['content'];
 909                                         $server["version"] = "";
 910                                         $server["network"] = Protocol::DIASPORA;
 911                                 }
 912                         }
 913                 }
 914
 915                 if (!$server) {
 916                         return false;
 917                 }
 918
 919                 $server["site_name"] = XML::getFirstNodeValue($xpath, '//head/title/text()');
 920
 921                 return $server;
 922         }
 923
 924         public static function checkServer($server_url, $network = "", $force = false)
 925         {
 926                 // Unify the server address
 927                 $server_url = trim($server_url, "/");
 928                 $server_url = str_replace("/index.php", "", $server_url);
 929
 930                 if ($server_url == "") {
 931                         return false;
 932                 }
 933
 934                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => Strings::normaliseLink($server_url)]);
 935                 if (DBA::isResult($gserver)) {
 936                         if ($gserver["created"] <= DBA::NULL_DATETIME) {
 937                                 $fields = ['created' => DateTimeFormat::utcNow()];
 938                                 $condition = ['nurl' => Strings::normaliseLink($server_url)];
 939                                 DBA::update('gserver', $fields, $condition);
 940                         }
 941                         $poco = $gserver["poco"];
 942                         $noscrape = $gserver["noscrape"];
 943
 944                         if ($network == "") {
 945                                 $network = $gserver["network"];
 946                         }
 947
 948                         $last_contact = $gserver["last_contact"];
 949                         $last_failure = $gserver["last_failure"];
 950                         $version = $gserver["version"];
 951                         $platform = $gserver["platform"];
 952                         $site_name = $gserver["site_name"];
 953                         $info = $gserver["info"];
 954                         $register_policy = $gserver["register_policy"];
 955                         $registered_users = $gserver["registered-users"];
 956
 957                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 958                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 959                         if ($last_contact < DBA::NULL_DATETIME) {
 960                                 $last_contact = DBA::NULL_DATETIME;
 961                         }
 962
 963                         if ($last_failure < DBA::NULL_DATETIME) {
 964                                 $last_failure = DBA::NULL_DATETIME;
 965                         }
 966
 967                         if (!$force && !self::updateNeeded($gserver["created"], "", $last_failure, $last_contact)) {
 968                                 Logger::log("Use cached data for server ".$server_url, Logger::DEBUG);
 969                                 return ($last_contact >= $last_failure);
 970                         }
 971                 } else {
 972                         $poco = "";
 973                         $noscrape = "";
 974                         $version = "";
 975                         $platform = "";
 976                         $site_name = "";
 977                         $info = "";
 978                         $register_policy = -1;
 979                         $registered_users = 0;
 980
 981                         $last_contact = DBA::NULL_DATETIME;
 982                         $last_failure = DBA::NULL_DATETIME;
 983                 }
 984                 Logger::log("Server ".$server_url." is outdated or unknown. Start discovery. Force: ".$force." Created: ".$gserver["created"]." Failure: ".$last_failure." Contact: ".$last_contact, Logger::DEBUG);
 985
 986                 $failure = false;
 987                 $possible_failure = false;
 988                 $orig_last_failure = $last_failure;
 989                 $orig_last_contact = $last_contact;
 990
 991                 // Mastodon uses the "@" for user profiles.
 992                 // But this can be misunderstood.
 993                 if (parse_url($server_url, PHP_URL_USER) != '') {
 994                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($server_url)]);
 995                         return false;
 996                 }
 997
 998                 // Check if the page is accessible via SSL.
 999                 $orig_server_url = $server_url;
1000                 $server_url = str_replace("http://", "https://", $server_url);
1001
1002                 // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
1003                 $curlResult = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
1004
1005                 // Quit if there is a timeout.
1006                 // But we want to make sure to only quit if we are mostly sure that this server url fits.
1007                 if (DBA::isResult($gserver) && ($orig_server_url == $server_url) &&
1008                         ($curlResult->isTimeout())) {
1009                         Logger::log("Connection to server ".$server_url." timed out.", Logger::DEBUG);
1010                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($server_url)]);
1011                         return false;
1012                 }
1013
1014                 // Maybe the page is unencrypted only?
1015                 $xmlobj = @simplexml_load_string($curlResult->getBody(), 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1016                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == "") || empty($xmlobj) || !is_object($xmlobj)) {
1017                         $server_url = str_replace("https://", "http://", $server_url);
1018
1019                         // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
1020                         $curlResult = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
1021
1022                         // Quit if there is a timeout
1023                         if ($curlResult->isTimeout()) {
1024                                 Logger::log("Connection to server " . $server_url . " timed out.", Logger::DEBUG);
1025                                 DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => Strings::normaliseLink($server_url)]);
1026                                 return false;
1027                         }
1028
1029                         $xmlobj = @simplexml_load_string($curlResult->getBody(), 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1030                 }
1031
1032                 if (!$curlResult->isSuccess() || ($curlResult->getBody() == "") || empty($xmlobj) || !is_object($xmlobj)) {
1033                         // Workaround for bad configured servers (known nginx problem)
1034                         if (!empty($curlResult->getInfo()) && !in_array($curlResult->getInfo()["http_code"], ["403", "404"])) {
1035                                 $failure = true;
1036                         }
1037
1038                         $possible_failure = true;
1039                 }
1040
1041                 // If the server has no possible failure we reset the cached data
1042                 if (!$possible_failure) {
1043                         $version = "";
1044                         $platform = "";
1045                         $site_name = "";
1046                         $info = "";
1047                         $register_policy = -1;
1048                 }
1049
1050                 if (!$failure) {
1051                         // This will be too low, but better than no value at all.
1052                         $registered_users = DBA::count('gcontact', ['server_url' => Strings::normaliseLink($server_url)]);
1053                 }
1054
1055                 // Look for poco
1056                 if (!$failure) {
1057                         $curlResult = Network::curl($server_url."/poco");
1058
1059                         if ($curlResult->isSuccess()) {
1060                                 $data = json_decode($curlResult->getBody(), true);
1061
1062                                 if (isset($data['totalResults'])) {
1063                                         $registered_users = $data['totalResults'];
1064                                         $poco = $server_url . "/poco";
1065                                         $server = self::detectPocoData($data);
1066
1067                                         if (!empty($server)) {
1068                                                 $platform = $server['platform'];
1069                                                 $network = $server['network'];
1070                                                 $version = '';
1071                                                 $site_name = '';
1072                                         }
1073                                 }
1074
1075                                 /*
1076                                  * There are servers out there who don't return 404 on a failure
1077                                  * We have to be sure that don't misunderstand this
1078                                  */
1079                                 if (is_null($data)) {
1080                                         $poco = "";
1081                                         $noscrape = "";
1082                                         $network = "";
1083                                 }
1084                         }
1085                 }
1086
1087                 if (!$failure) {
1088                         // Test for Diaspora, Hubzilla, Mastodon or older Friendica servers
1089                         $curlResult = Network::curl($server_url);
1090
1091                         if (!$curlResult->isSuccess() || ($curlResult->getBody() == "")) {
1092                                 $failure = true;
1093                         } else {
1094                                 $server = self::detectServerType($curlResult->getBody());
1095
1096                                 if (!empty($server)) {
1097                                         $platform = $server['platform'];
1098                                         $network = $server['network'];
1099                                         $version = $server['version'];
1100                                         $site_name = $server['site_name'];
1101                                 }
1102
1103                                 $lines = explode("\n", $curlResult->getHeader());
1104
1105                                 if (count($lines)) {
1106                                         foreach ($lines as $line) {
1107                                                 $line = trim($line);
1108
1109                                                 if (stristr($line, 'X-Diaspora-Version:')) {
1110                                                         $platform = "Diaspora";
1111                                                         $version = trim(str_replace("X-Diaspora-Version:", "", $line));
1112                                                         $version = trim(str_replace("x-diaspora-version:", "", $version));
1113                                                         $network = Protocol::DIASPORA;
1114                                                         $versionparts = explode("-", $version);
1115                                                         $version = $versionparts[0];
1116                                                 }
1117
1118                                                 if (stristr($line, 'Server: Mastodon')) {
1119                                                         $platform = "Mastodon";
1120                                                         $network = Protocol::OSTATUS;
1121                                                 }
1122                                         }
1123                                 }
1124                         }
1125                 }
1126
1127                 if (!$failure && ($poco == "")) {
1128                         // Test for Statusnet
1129                         // Will also return data for Friendica and GNU Social - but it will be overwritten later
1130                         // The "not implemented" is a special treatment for really, really old Friendica versions
1131                         $curlResult = Network::curl($server_url."/api/statusnet/version.json");
1132
1133                         if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1134                                 ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1135                                 $platform = "StatusNet";
1136                                 // Remove junk that some GNU Social servers return
1137                                 $version = str_replace(chr(239).chr(187).chr(191), "", $curlResult->getBody());
1138                                 $version = trim($version, '"');
1139                                 $network = Protocol::OSTATUS;
1140                         }
1141
1142                         // Test for GNU Social
1143                         $curlResult = Network::curl($server_url."/api/gnusocial/version.json");
1144
1145                         if ($curlResult->isSuccess() && ($curlResult->getBody() != '{"error":"not implemented"}') &&
1146                                 ($curlResult->getBody() != '') && (strlen($curlResult->getBody()) < 30)) {
1147                                 $platform = "GNU Social";
1148                                 // Remove junk that some GNU Social servers return
1149                                 $version = str_replace(chr(239) . chr(187) . chr(191), "", $curlResult->getBody());
1150                                 $version = trim($version, '"');
1151                                 $network = Protocol::OSTATUS;
1152                         }
1153
1154                         // Test for Mastodon
1155                         $orig_version = $version;
1156                         $curlResult = Network::curl($server_url . "/api/v1/instance");
1157
1158                         if ($curlResult->isSuccess() && ($curlResult->getBody() != '')) {
1159                                 $data = json_decode($curlResult->getBody(), true);
1160
1161                                 if (isset($data['version'])) {
1162                                         $platform = "Mastodon";
1163                                         $version = defaults($data, 'version', '');
1164                                         $site_name = defaults($data, 'title', '');
1165                                         $info = defaults($data, 'description', '');
1166                                         $network = Protocol::OSTATUS;
1167                                 }
1168
1169                                 if (!empty($data['stats']['user_count'])) {
1170                                         $registered_users = $data['stats']['user_count'];
1171                                 }
1172                         }
1173
1174                         if (strstr($orig_version . $version, 'Pleroma')) {
1175                                 $platform = 'Pleroma';
1176                                 $version = trim(str_replace('Pleroma', '', $version));
1177                         }
1178                 }
1179
1180                 if (!$failure) {
1181                         // Test for Hubzilla and Red
1182                         $curlResult = Network::curl($server_url . "/siteinfo.json");
1183
1184                         if ($curlResult->isSuccess()) {
1185                                 $data = json_decode($curlResult->getBody(), true);
1186
1187                                 if (isset($data['url'])) {
1188                                         $platform = $data['platform'];
1189                                         $version = $data['version'];
1190                                         $network = Protocol::DIASPORA;
1191                                 }
1192
1193                                 if (!empty($data['site_name'])) {
1194                                         $site_name = $data['site_name'];
1195                                 }
1196
1197                                 if (!empty($data['channels_total'])) {
1198                                         $registered_users = $data['channels_total'];
1199                                 }
1200
1201                                 if (!empty($data['register_policy'])) {
1202                                         switch ($data['register_policy']) {
1203                                                 case "REGISTER_OPEN":
1204                                                         $register_policy = REGISTER_OPEN;
1205                                                         break;
1206
1207                                                 case "REGISTER_APPROVE":
1208                                                         $register_policy = REGISTER_APPROVE;
1209                                                         break;
1210
1211                                                 case "REGISTER_CLOSED":
1212                                                 default:
1213                                                         $register_policy = REGISTER_CLOSED;
1214                                                         break;
1215                                         }
1216                                 }
1217                         } else {
1218                                 // Test for Hubzilla, Redmatrix or Friendica
1219                                 $curlResult = Network::curl($server_url."/api/statusnet/config.json");
1220
1221                                 if ($curlResult->isSuccess()) {
1222                                         $data = json_decode($curlResult->getBody(), true);
1223
1224                                         if (isset($data['site']['server'])) {
1225                                                 if (isset($data['site']['platform'])) {
1226                                                         $platform = $data['site']['platform']['PLATFORM_NAME'];
1227                                                         $version = $data['site']['platform']['STD_VERSION'];
1228                                                         $network = Protocol::DIASPORA;
1229                                                 }
1230
1231                                                 if (isset($data['site']['BlaBlaNet'])) {
1232                                                         $platform = $data['site']['BlaBlaNet']['PLATFORM_NAME'];
1233                                                         $version = $data['site']['BlaBlaNet']['STD_VERSION'];
1234                                                         $network = Protocol::DIASPORA;
1235                                                 }
1236
1237                                                 if (isset($data['site']['hubzilla'])) {
1238                                                         $platform = $data['site']['hubzilla']['PLATFORM_NAME'];
1239                                                         $version = $data['site']['hubzilla']['RED_VERSION'];
1240                                                         $network = Protocol::DIASPORA;
1241                                                 }
1242
1243                                                 if (isset($data['site']['redmatrix'])) {
1244                                                         if (isset($data['site']['redmatrix']['PLATFORM_NAME'])) {
1245                                                                 $platform = $data['site']['redmatrix']['PLATFORM_NAME'];
1246                                                         } elseif (isset($data['site']['redmatrix']['RED_PLATFORM'])) {
1247                                                                 $platform = $data['site']['redmatrix']['RED_PLATFORM'];
1248                                                         }
1249
1250                                                         $version = $data['site']['redmatrix']['RED_VERSION'];
1251                                                         $network = Protocol::DIASPORA;
1252                                                 }
1253
1254                                                 if (isset($data['site']['friendica'])) {
1255                                                         $platform = $data['site']['friendica']['FRIENDICA_PLATFORM'];
1256                                                         $version = $data['site']['friendica']['FRIENDICA_VERSION'];
1257                                                         $network = Protocol::DFRN;
1258                                                 }
1259
1260                                                 $site_name = $data['site']['name'];
1261
1262                                                 $private = false;
1263                                                 $inviteonly = false;
1264                                                 $closed = false;
1265
1266                                                 if (!empty($data['site']['closed'])) {
1267                                                         $closed = self::toBoolean($data['site']['closed']);
1268                                                 }
1269
1270                                                 if (!empty($data['site']['private'])) {
1271                                                         $private = self::toBoolean($data['site']['private']);
1272                                                 }
1273
1274                                                 if (!empty($data['site']['inviteonly'])) {
1275                                                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1276                                                 }
1277
1278                                                 if (!$closed && !$private and $inviteonly) {
1279                                                         $register_policy = REGISTER_APPROVE;
1280                                                 } elseif (!$closed && !$private) {
1281                                                         $register_policy = REGISTER_OPEN;
1282                                                 } else {
1283                                                         $register_policy = REGISTER_CLOSED;
1284                                                 }
1285                                         }
1286                                 }
1287                         }
1288                 }
1289
1290                 // Query statistics.json. Optional package for Diaspora, Friendica and Redmatrix
1291                 if (!$failure) {
1292                         $curlResult = Network::curl($server_url . "/statistics.json");
1293
1294                         if ($curlResult->isSuccess()) {
1295                                 $data = json_decode($curlResult->getBody(), true);
1296
1297                                 if (isset($data['version'])) {
1298                                         $version = $data['version'];
1299                                         // Version numbers on statistics.json are presented with additional info, e.g.:
1300                                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
1301                                         $version = preg_replace("=(.+)-(.{4,})=ism", "$1", $version);
1302                                 }
1303
1304                                 if (!empty($data['name'])) {
1305                                         $site_name = $data['name'];
1306                                 }
1307
1308                                 if (!empty($data['network'])) {
1309                                         $platform = $data['network'];
1310                                 }
1311
1312                                 if ($platform == "Diaspora") {
1313                                         $network = Protocol::DIASPORA;
1314                                 }
1315
1316                                 if (!empty($data['registrations_open']) && $data['registrations_open']) {
1317                                         $register_policy = REGISTER_OPEN;
1318                                 } else {
1319                                         $register_policy = REGISTER_CLOSED;
1320                                 }
1321                         }
1322                 }
1323
1324                 // Query nodeinfo. Working for (at least) Diaspora and Friendica.
1325                 if (!$failure) {
1326                         $server = self::fetchNodeinfo($server_url);
1327
1328                         if (!empty($server)) {
1329                                 $register_policy = $server['register_policy'];
1330
1331                                 if (isset($server['platform'])) {
1332                                         $platform = $server['platform'];
1333                                 }
1334
1335                                 if (isset($server['network'])) {
1336                                         $network = $server['network'];
1337                                 }
1338
1339                                 if (isset($server['version'])) {
1340                                         $version = $server['version'];
1341                                 }
1342
1343                                 if (isset($server['site_name'])) {
1344                                         $site_name = $server['site_name'];
1345                                 }
1346
1347                                 if (isset($server['registered-users'])) {
1348                                         $registered_users = $server['registered-users'];
1349                                 }
1350                         }
1351                 }
1352
1353                 // Check for noscrape
1354                 // Friendica servers could be detected as OStatus servers
1355                 if (!$failure && in_array($network, [Protocol::DFRN, Protocol::OSTATUS])) {
1356                         $curlResult = Network::curl($server_url . "/friendica/json");
1357
1358                         if (!$curlResult->isSuccess()) {
1359                                 $curlResult = Network::curl($server_url . "/friendika/json");
1360                         }
1361
1362                         if ($curlResult->isSuccess()) {
1363                                 $data = json_decode($curlResult->getBody(), true);
1364
1365                                 if (isset($data['version'])) {
1366                                         $network = Protocol::DFRN;
1367
1368                                         if (!empty($data['no_scrape_url'])) {
1369                                                 $noscrape = $data['no_scrape_url'];
1370                                         }
1371
1372                                         $version = $data['version'];
1373
1374                                         if (!empty($data['site_name'])) {
1375                                                 $site_name = $data['site_name'];
1376                                         }
1377
1378                                         $info = defaults($data, 'info', '');
1379                                         $register_policy = defaults($data, 'register_policy', REGISTER_CLOSED);
1380                                         if (in_array($register_policy, ['REGISTER_CLOSED', 'REGISTER_APPROVE', 'REGISTER_OPEN'])) {
1381                                                 $register_policy = constant($register_policy);
1382                                         } else {
1383                                                 Logger::log("Register policy '$register_policy' from $server_url is invalid.");
1384                                                 $register_policy = REGISTER_CLOSED; // set a default value
1385                                         }
1386                                         $platform = defaults($data, 'platform', '');
1387                                 }
1388                         }
1389                 }
1390
1391                 // Every server has got at least an admin account
1392                 if (!$failure && ($registered_users == 0)) {
1393                         $registered_users = 1;
1394                 }
1395
1396                 if ($possible_failure && !$failure) {
1397                         $failure = true;
1398                 }
1399
1400                 if ($failure) {
1401                         $last_contact = $orig_last_contact;
1402                         $last_failure = DateTimeFormat::utcNow();
1403                 } else {
1404                         $last_contact = DateTimeFormat::utcNow();
1405                         $last_failure = $orig_last_failure;
1406                 }
1407
1408                 if (($last_contact <= $last_failure) && !$failure) {
1409                         Logger::log("Server ".$server_url." seems to be alive, but last contact wasn't set - could be a bug", Logger::DEBUG);
1410                 } elseif (($last_contact >= $last_failure) && $failure) {
1411                         Logger::log("Server ".$server_url." seems to be dead, but last failure wasn't set - could be a bug", Logger::DEBUG);
1412                 }
1413
1414                 // Check again if the server exists
1415                 $found = DBA::exists('gserver', ['nurl' => Strings::normaliseLink($server_url)]);
1416
1417                 $version = strip_tags($version);
1418                 $site_name = strip_tags($site_name);
1419                 $info = strip_tags($info);
1420                 $platform = strip_tags($platform);
1421
1422                 $fields = ['url' => $server_url, 'version' => $version,
1423                                 'site_name' => $site_name, 'info' => $info, 'register_policy' => $register_policy,
1424                                 'poco' => $poco, 'noscrape' => $noscrape, 'network' => $network,
1425                                 'platform' => $platform, 'registered-users' => $registered_users,
1426                                 'last_contact' => $last_contact, 'last_failure' => $last_failure];
1427
1428                 if ($found) {
1429                         DBA::update('gserver', $fields, ['nurl' => Strings::normaliseLink($server_url)]);
1430                 } elseif (!$failure) {
1431                         $fields['nurl'] = Strings::normaliseLink($server_url);
1432                         $fields['created'] = DateTimeFormat::utcNow();
1433                         DBA::insert('gserver', $fields);
1434                 }
1435
1436                 if (!$failure && in_array($fields['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
1437                         self::discoverRelay($server_url);
1438                 }
1439
1440                 Logger::log("End discovery for server " . $server_url, Logger::DEBUG);
1441
1442                 return !$failure;
1443         }
1444
1445         /**
1446          * @brief Fetch relay data from a given server url
1447          *
1448          * @param string $server_url address of the server
1449          */
1450         private static function discoverRelay($server_url)
1451         {
1452                 Logger::log("Discover relay data for server " . $server_url, Logger::DEBUG);
1453
1454                 $curlResult = Network::curl($server_url . "/.well-known/x-social-relay");
1455
1456                 if (!$curlResult->isSuccess()) {
1457                         return;
1458                 }
1459
1460                 $data = json_decode($curlResult->getBody(), true);
1461
1462                 if (!is_array($data)) {
1463                         return;
1464                 }
1465
1466                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => Strings::normaliseLink($server_url)]);
1467
1468                 if (!DBA::isResult($gserver)) {
1469                         return;
1470                 }
1471
1472                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
1473                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
1474                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
1475                 }
1476
1477                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
1478
1479                 if ($data['scope'] == 'tags') {
1480                         // Avoid duplicates
1481                         $tags = [];
1482                         foreach ($data['tags'] as $tag) {
1483                                 $tag = mb_strtolower($tag);
1484                                 if (strlen($tag) < 100) {
1485                                         $tags[$tag] = $tag;
1486                                 }
1487                         }
1488
1489                         foreach ($tags as $tag) {
1490                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
1491                         }
1492                 }
1493
1494                 // Create or update the relay contact
1495                 $fields = [];
1496                 if (isset($data['protocols'])) {
1497                         if (isset($data['protocols']['diaspora'])) {
1498                                 $fields['network'] = Protocol::DIASPORA;
1499
1500                                 if (isset($data['protocols']['diaspora']['receive'])) {
1501                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
1502                                 } elseif (is_string($data['protocols']['diaspora'])) {
1503                                         $fields['batch'] = $data['protocols']['diaspora'];
1504                                 }
1505                         }
1506
1507                         if (isset($data['protocols']['dfrn'])) {
1508                                 $fields['network'] = Protocol::DFRN;
1509
1510                                 if (isset($data['protocols']['dfrn']['receive'])) {
1511                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
1512                                 } elseif (is_string($data['protocols']['dfrn'])) {
1513                                         $fields['batch'] = $data['protocols']['dfrn'];
1514                                 }
1515                         }
1516                 }
1517                 Diaspora::setRelayContact($server_url, $fields);
1518         }
1519
1520         /**
1521          * @brief Returns a list of all known servers
1522          * @return array List of server urls
1523          */
1524         public static function serverlist()
1525         {
1526                 $r = q(
1527                         "SELECT `url`, `site_name` AS `displayName`, `network`, `platform`, `version` FROM `gserver`
1528                         WHERE `network` IN ('%s', '%s', '%s') AND `last_contact` > `last_failure`
1529                         ORDER BY `last_contact`
1530                         LIMIT 1000",
1531                         DBA::escape(Protocol::DFRN),
1532                         DBA::escape(Protocol::DIASPORA),
1533                         DBA::escape(Protocol::OSTATUS)
1534                 );
1535
1536                 if (!DBA::isResult($r)) {
1537                         return false;
1538                 }
1539
1540                 return $r;
1541         }
1542
1543         /**
1544          * @brief Fetch server list from remote servers and adds them when they are new.
1545          *
1546          * @param string $poco URL to the POCO endpoint
1547          */
1548         private static function fetchServerlist($poco)
1549         {
1550                 $curlResult = Network::curl($poco . "/@server");
1551
1552                 if (!$curlResult->isSuccess()) {
1553                         return;
1554                 }
1555
1556                 $serverlist = json_decode($curlResult->getBody(), true);
1557
1558                 if (!is_array($serverlist)) {
1559                         return;
1560                 }
1561
1562                 foreach ($serverlist as $server) {
1563                         $server_url = str_replace("/index.php", "", $server['url']);
1564
1565                         $r = q("SELECT `nurl` FROM `gserver` WHERE `nurl` = '%s'", DBA::escape(Strings::normaliseLink($server_url)));
1566
1567                         if (!DBA::isResult($r)) {
1568                                 Logger::log("Call server check for server ".$server_url, Logger::DEBUG);
1569                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $server_url);
1570                         }
1571                 }
1572         }
1573
1574         private static function discoverFederation()
1575         {
1576                 $last = Config::get('poco', 'last_federation_discovery');
1577
1578                 if ($last) {
1579                         $next = $last + (24 * 60 * 60);
1580
1581                         if ($next > time()) {
1582                                 return;
1583                         }
1584                 }
1585
1586                 // Discover Friendica, Hubzilla and Diaspora servers
1587                 $curlResult = Network::fetchUrl("http://the-federation.info/pods.json");
1588
1589                 if (!empty($curlResult)) {
1590                         $servers = json_decode($curlResult, true);
1591
1592                         if (!empty($servers['pods'])) {
1593                                 foreach ($servers['pods'] as $server) {
1594                                         Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://" . $server['host']);
1595                                 }
1596                         }
1597                 }
1598
1599                 // Disvover Mastodon servers
1600                 if (!Config::get('system', 'ostatus_disabled')) {
1601                         $accesstoken = Config::get('system', 'instances_social_key');
1602
1603                         if (!empty($accesstoken)) {
1604                                 $api = 'https://instances.social/api/1.0/instances/list?count=0';
1605                                 $header = ['Authorization: Bearer '.$accesstoken];
1606                                 $curlResult = Network::curl($api, false, $redirects, ['headers' => $header]);
1607
1608                                 if ($curlResult->isSuccess()) {
1609                                         $servers = json_decode($curlResult->getBody(), true);
1610
1611                                         foreach ($servers['instances'] as $server) {
1612                                                 $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1613                                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $url);
1614                                         }
1615                                 }
1616                         }
1617                 }
1618
1619                 // Currently disabled, since the service isn't available anymore.
1620                 // It is not removed since I hope that there will be a successor.
1621                 // Discover GNU Social Servers.
1622                 //if (!Config::get('system','ostatus_disabled')) {
1623                 //      $serverdata = "http://gstools.org/api/get_open_instances/";
1624
1625                 //      $curlResult = Network::curl($serverdata);
1626                 //      if ($curlResult->isSuccess()) {
1627                 //              $servers = json_decode($result->getBody(), true);
1628
1629                 //              foreach($servers['data'] as $server)
1630                 //                      self::checkServer($server['instance_address']);
1631                 //      }
1632                 //}
1633
1634                 Config::set('poco', 'last_federation_discovery', time());
1635         }
1636
1637         public static function discoverSingleServer($id)
1638         {
1639                 $r = q("SELECT `poco`, `nurl`, `url`, `network` FROM `gserver` WHERE `id` = %d", intval($id));
1640
1641                 if (!DBA::isResult($r)) {
1642                         return false;
1643                 }
1644
1645                 $server = $r[0];
1646
1647                 // Discover new servers out there (Works from Friendica version 3.5.2)
1648                 self::fetchServerlist($server["poco"]);
1649
1650                 // Fetch all users from the other server
1651                 $url = $server["poco"] . "/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1652
1653                 Logger::log("Fetch all users from the server " . $server["url"], Logger::DEBUG);
1654
1655                 $curlResult = Network::curl($url);
1656
1657                 if ($curlResult->isSuccess() && !empty($curlResult->getBody())) {
1658                         $data = json_decode($curlResult->getBody(), true);
1659
1660                         if (!empty($data)) {
1661                                 self::discoverServer($data, 2);
1662                         }
1663
1664                         if (Config::get('system', 'poco_discovery') > 1) {
1665                                 $timeframe = Config::get('system', 'poco_discovery_since');
1666
1667                                 if ($timeframe == 0) {
1668                                         $timeframe = 30;
1669                                 }
1670
1671                                 $updatedSince = date(DateTimeFormat::MYSQL, time() - $timeframe * 86400);
1672
1673                                 // Fetch all global contacts from the other server (Not working with Redmatrix and Friendica versions before 3.3)
1674                                 $url = $server["poco"]."/@global?updatedSince=".$updatedSince."&fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1675
1676                                 $success = false;
1677
1678                                 $curlResult = Network::curl($url);
1679
1680                                 if ($curlResult->isSuccess() && !empty($curlResult->getBody())) {
1681                                         Logger::log("Fetch all global contacts from the server " . $server["nurl"], Logger::DEBUG);
1682                                         $data = json_decode($curlResult->getBody(), true);
1683
1684                                         if (!empty($data)) {
1685                                                 $success = self::discoverServer($data);
1686                                         }
1687                                 }
1688
1689                                 if (!$success && (Config::get('system', 'poco_discovery') > 2)) {
1690                                         Logger::log("Fetch contacts from users of the server " . $server["nurl"], Logger::DEBUG);
1691                                         self::discoverServerUsers($data, $server);
1692                                 }
1693                         }
1694
1695                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1696                         DBA::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1697
1698                         return true;
1699                 } else {
1700                         // If the server hadn't replied correctly, then force a sanity check
1701                         self::checkServer($server["url"], $server["network"], true);
1702
1703                         // If we couldn't reach the server, we will try it some time later
1704                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1705                         DBA::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1706
1707                         return false;
1708                 }
1709         }
1710
1711         public static function discover($complete = false)
1712         {
1713                 // Update the server list
1714                 self::discoverFederation();
1715
1716                 $no_of_queries = 5;
1717
1718                 $requery_days = intval(Config::get('system', 'poco_requery_days'));
1719
1720                 if ($requery_days == 0) {
1721                         $requery_days = 7;
1722                 }
1723
1724                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1725
1726                 $gservers = q("SELECT `id`, `url`, `nurl`, `network`
1727                         FROM `gserver`
1728                         WHERE `last_contact` >= `last_failure`
1729                         AND `poco` != ''
1730                         AND `last_poco_query` < '%s'
1731                         ORDER BY RAND()", DBA::escape($last_update)
1732                 );
1733
1734                 if (DBA::isResult($gservers)) {
1735                         foreach ($gservers as $gserver) {
1736                                 if (!self::checkServer($gserver['url'], $gserver['network'])) {
1737                                         // The server is not reachable? Okay, then we will try it later
1738                                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1739                                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1740                                         continue;
1741                                 }
1742
1743                                 Logger::log('Update directory from server ' . $gserver['url'] . ' with ID ' . $gserver['id'], Logger::DEBUG);
1744                                 Worker::add(PRIORITY_LOW, 'DiscoverPoCo', 'update_server_directory', (int) $gserver['id']);
1745
1746                                 if (!$complete && ( --$no_of_queries == 0)) {
1747                                         break;
1748                                 }
1749                         }
1750                 }
1751         }
1752
1753         private static function discoverServerUsers(array $data, array $server)
1754         {
1755                 if (!isset($data['entry'])) {
1756                         return;
1757                 }
1758
1759                 foreach ($data['entry'] as $entry) {
1760                         $username = '';
1761
1762                         if (isset($entry['urls'])) {
1763                                 foreach ($entry['urls'] as $url) {
1764                                         if ($url['type'] == 'profile') {
1765                                                 $profile_url = $url['value'];
1766                                                 $path_array = explode('/', parse_url($profile_url, PHP_URL_PATH));
1767                                                 $username = end($path_array);
1768                                         }
1769                                 }
1770                         }
1771
1772                         if ($username != '') {
1773                                 Logger::log('Fetch contacts for the user ' . $username . ' from the server ' . $server['nurl'], Logger::DEBUG);
1774
1775                                 // Fetch all contacts from a given user from the other server
1776                                 $url = $server['poco'] . '/' . $username . '/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation';
1777
1778                                 $curlResult = Network::curl($url);
1779
1780                                 if ($curlResult->isSuccess()) {
1781                                         $data = json_decode($curlResult->getBody(), true);
1782
1783                                         if (!empty($data)) {
1784                                                 self::discoverServer($data, 3);
1785                                         }
1786                                 }
1787                         }
1788                 }
1789         }
1790
1791         private static function discoverServer(array $data, $default_generation = 0)
1792         {
1793                 if (empty($data['entry'])) {
1794                         return false;
1795                 }
1796
1797                 $success = false;
1798
1799                 foreach ($data['entry'] as $entry) {
1800                         $profile_url = '';
1801                         $profile_photo = '';
1802                         $connect_url = '';
1803                         $name = '';
1804                         $network = '';
1805                         $updated = DBA::NULL_DATETIME;
1806                         $location = '';
1807                         $about = '';
1808                         $keywords = '';
1809                         $gender = '';
1810                         $contact_type = -1;
1811                         $generation = $default_generation;
1812
1813                         if (!empty($entry['displayName'])) {
1814                                 $name = $entry['displayName'];
1815                         }
1816
1817                         if (isset($entry['urls'])) {
1818                                 foreach ($entry['urls'] as $url) {
1819                                         if ($url['type'] == 'profile') {
1820                                                 $profile_url = $url['value'];
1821                                                 continue;
1822                                         }
1823                                         if ($url['type'] == 'webfinger') {
1824                                                 $connect_url = str_replace('acct:' , '', $url['value']);
1825                                                 continue;
1826                                         }
1827                                 }
1828                         }
1829
1830                         if (isset($entry['photos'])) {
1831                                 foreach ($entry['photos'] as $photo) {
1832                                         if ($photo['type'] == 'profile') {
1833                                                 $profile_photo = $photo['value'];
1834                                                 continue;
1835                                         }
1836                                 }
1837                         }
1838
1839                         if (isset($entry['updated'])) {
1840                                 $updated = date(DateTimeFormat::MYSQL, strtotime($entry['updated']));
1841                         }
1842
1843                         if (isset($entry['network'])) {
1844                                 $network = $entry['network'];
1845                         }
1846
1847                         if (isset($entry['currentLocation'])) {
1848                                 $location = $entry['currentLocation'];
1849                         }
1850
1851                         if (isset($entry['aboutMe'])) {
1852                                 $about = HTML::toBBCode($entry['aboutMe']);
1853                         }
1854
1855                         if (isset($entry['gender'])) {
1856                                 $gender = $entry['gender'];
1857                         }
1858
1859                         if (isset($entry['generation']) && ($entry['generation'] > 0)) {
1860                                 $generation = ++$entry['generation'];
1861                         }
1862
1863                         if (isset($entry['contactType']) && ($entry['contactType'] >= 0)) {
1864                                 $contact_type = $entry['contactType'];
1865                         }
1866
1867                         if (isset($entry['tags'])) {
1868                                 foreach ($entry['tags'] as $tag) {
1869                                         $keywords = implode(", ", $tag);
1870                                 }
1871                         }
1872
1873                         if ($generation > 0) {
1874                                 $success = true;
1875
1876                                 Logger::log("Store profile ".$profile_url, Logger::DEBUG);
1877
1878                                 $gcontact = ["url" => $profile_url,
1879                                                 "name" => $name,
1880                                                 "network" => $network,
1881                                                 "photo" => $profile_photo,
1882                                                 "about" => $about,
1883                                                 "location" => $location,
1884                                                 "gender" => $gender,
1885                                                 "keywords" => $keywords,
1886                                                 "connect" => $connect_url,
1887                                                 "updated" => $updated,
1888                                                 "contact-type" => $contact_type,
1889                                                 "generation" => $generation];
1890
1891                                 try {
1892                                         $gcontact = GContact::sanitize($gcontact);
1893                                         GContact::update($gcontact);
1894                                 } catch (Exception $e) {
1895                                         Logger::log($e->getMessage(), Logger::DEBUG);
1896                                 }
1897
1898                                 Logger::log("Done for profile ".$profile_url, Logger::DEBUG);
1899                         }
1900                 }
1901                 return $success;
1902         }
1903
1904 }