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