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 $link) {
 662                         if ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 663                                 $nodeinfo1_url = $link['href'];
 664                         } elseif ($link['rel'] == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 665                                 $nodeinfo2_url = $link['href'];
 666                         }
 667                 }
 668
 669                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 670                         return false;
 671                 }
 672
 673                 $server = [];
 674
 675                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 676                 if (!empty($nodeinfo2_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 677                         $server = self::parseNodeinfo2($nodeinfo2_url);
 678                 }
 679
 680                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 681                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 682                         $server = self::parseNodeinfo1($nodeinfo1_url);
 683                 }
 684
 685                 return $server;
 686         }
 687
 688         /**
 689          * @brief Parses Nodeinfo 1
 690          *
 691          * @param string $nodeinfo_url address of the nodeinfo path
 692          * @return array Server data
 693          */
 694         private static function parseNodeinfo1($nodeinfo_url)
 695         {
 696                 $serverret = Network::curl($nodeinfo_url);
 697
 698                 if (!$serverret["success"]) {
 699                         return false;
 700                 }
 701
 702                 $nodeinfo = json_decode($serverret['body'], true);
 703
 704                 if (!is_array($nodeinfo)) {
 705                         return false;
 706                 }
 707
 708                 $server = [];
 709
 710                 $server['register_policy'] = REGISTER_CLOSED;
 711
 712                 if (is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
 713                         $server['register_policy'] = REGISTER_OPEN;
 714                 }
 715
 716                 if (is_array($nodeinfo['software'])) {
 717                         if (isset($nodeinfo['software']['name'])) {
 718                                 $server['platform'] = $nodeinfo['software']['name'];
 719                         }
 720
 721                         if (isset($nodeinfo['software']['version'])) {
 722                                 $server['version'] = $nodeinfo['software']['version'];
 723                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 724                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 725                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 726                         }
 727                 }
 728
 729                 if (is_array($nodeinfo['metadata']) && isset($nodeinfo['metadata']['nodeName'])) {
 730                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 731                 }
 732
 733                 if (!empty($nodeinfo['usage']['users']['total'])) {
 734                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 735                 }
 736
 737                 $diaspora = false;
 738                 $friendica = false;
 739                 $gnusocial = false;
 740
 741                 if (is_array($nodeinfo['protocols']['inbound'])) {
 742                         foreach ($nodeinfo['protocols']['inbound'] as $inbound) {
 743                                 if ($inbound == 'diaspora') {
 744                                         $diaspora = true;
 745                                 }
 746                                 if ($inbound == 'friendica') {
 747                                         $friendica = true;
 748                                 }
 749                                 if ($inbound == 'gnusocial') {
 750                                         $gnusocial = true;
 751                                 }
 752                         }
 753                 }
 754
 755                 if ($gnusocial) {
 756                         $server['network'] = NETWORK_OSTATUS;
 757                 }
 758                 if ($diaspora) {
 759                         $server['network'] = NETWORK_DIASPORA;
 760                 }
 761                 if ($friendica) {
 762                         $server['network'] = NETWORK_DFRN;
 763                 }
 764
 765                 if (!$server) {
 766                         return false;
 767                 }
 768
 769                 return $server;
 770         }
 771
 772         /**
 773          * @brief Parses Nodeinfo 2
 774          *
 775          * @param string $nodeinfo_url address of the nodeinfo path
 776          * @return array Server data
 777          */
 778         private static function parseNodeinfo2($nodeinfo_url)
 779         {
 780                 $serverret = Network::curl($nodeinfo_url);
 781                 if (!$serverret["success"]) {
 782                         return false;
 783                 }
 784
 785                 $nodeinfo = json_decode($serverret['body'], true);
 786
 787                 if (!is_array($nodeinfo)) {
 788                         return false;
 789                 }
 790
 791                 $server = [];
 792
 793                 $server['register_policy'] = REGISTER_CLOSED;
 794
 795                 if (is_bool($nodeinfo['openRegistrations']) && $nodeinfo['openRegistrations']) {
 796                         $server['register_policy'] = REGISTER_OPEN;
 797                 }
 798
 799                 if (is_array($nodeinfo['software'])) {
 800                         if (isset($nodeinfo['software']['name'])) {
 801                                 $server['platform'] = $nodeinfo['software']['name'];
 802                         }
 803
 804                         if (isset($nodeinfo['software']['version'])) {
 805                                 $server['version'] = $nodeinfo['software']['version'];
 806                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 807                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 808                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 809                         }
 810                 }
 811
 812                 if (is_array($nodeinfo['metadata']) && isset($nodeinfo['metadata']['nodeName'])) {
 813                         $server['site_name'] = $nodeinfo['metadata']['nodeName'];
 814                 }
 815
 816                 if (!empty($nodeinfo['usage']['users']['total'])) {
 817                         $server['registered-users'] = $nodeinfo['usage']['users']['total'];
 818                 }
 819
 820                 $diaspora = false;
 821                 $friendica = false;
 822                 $gnusocial = false;
 823
 824                 if (!empty($nodeinfo['protocols'])) {
 825                         foreach ($nodeinfo['protocols'] as $protocol) {
 826                                 if ($protocol == 'diaspora') {
 827                                         $diaspora = true;
 828                                 } elseif ($protocol == 'friendica') {
 829                                         $friendica = true;
 830                                 } elseif ($protocol == 'gnusocial') {
 831                                         $gnusocial = true;
 832                                 }
 833                         }
 834                 }
 835
 836                 if ($gnusocial) {
 837                         $server['network'] = NETWORK_OSTATUS;
 838                 } elseif ($diaspora) {
 839                         $server['network'] = NETWORK_DIASPORA;
 840                 } elseif ($friendica) {
 841                         $server['network'] = NETWORK_DFRN;
 842                 }
 843
 844                 if (empty($server)) {
 845                         return false;
 846                 }
 847
 848                 return $server;
 849         }
 850
 851         /**
 852          * @brief Detect server type (Hubzilla or Friendica) via the front page body
 853          *
 854          * @param string $body Front page of the server
 855          * @return array Server data
 856          */
 857         private static function detectServerType($body)
 858         {
 859                 $server = false;
 860
 861                 $doc = new DOMDocument();
 862                 /// @TODO Acoid supressing error
 863                 @$doc->loadHTML($body);
 864                 $xpath = new DOMXPath($doc);
 865
 866                 $list = $xpath->query("//meta[@name]");
 867
 868                 foreach ($list as $node) {
 869                         $attr = [];
 870                         if ($node->attributes->length) {
 871                                 foreach ($node->attributes as $attribute) {
 872                                         $attr[$attribute->name] = $attribute->value;
 873                                 }
 874                         }
 875                         if ($attr['name'] == 'generator') {
 876                                 $version_part = explode(" ", $attr['content']);
 877                                 if (count($version_part) == 2) {
 878                                         if (in_array($version_part[0], ["Friendika", "Friendica"])) {
 879                                                 $server = [];
 880                                                 $server["platform"] = $version_part[0];
 881                                                 $server["version"] = $version_part[1];
 882                                                 $server["network"] = NETWORK_DFRN;
 883                                         }
 884                                 }
 885                         }
 886                 }
 887
 888                 if (!$server) {
 889                         $list = $xpath->query("//meta[@property]");
 890
 891                         foreach ($list as $node) {
 892                                 $attr = [];
 893                                 if ($node->attributes->length) {
 894                                         foreach ($node->attributes as $attribute) {
 895                                                 $attr[$attribute->name] = $attribute->value;
 896                                         }
 897                                 }
 898                                 if ($attr['property'] == 'generator' && in_array($attr['content'], ["hubzilla", "BlaBlaNet"])) {
 899                                         $server = [];
 900                                         $server["platform"] = $attr['content'];
 901                                         $server["version"] = "";
 902                                         $server["network"] = NETWORK_DIASPORA;
 903                                 }
 904                         }
 905                 }
 906
 907                 if (!$server) {
 908                         return false;
 909                 }
 910
 911                 $server["site_name"] = XML::getFirstNodeValue($xpath, '//head/title/text()');
 912
 913                 return $server;
 914         }
 915
 916         public static function checkServer($server_url, $network = "", $force = false)
 917         {
 918                 // Unify the server address
 919                 $server_url = trim($server_url, "/");
 920                 $server_url = str_replace("/index.php", "", $server_url);
 921
 922                 if ($server_url == "") {
 923                         return false;
 924                 }
 925
 926                 $gserver = DBA::selectFirst('gserver', [], ['nurl' => normalise_link($server_url)]);
 927                 if (DBA::isResult($gserver)) {
 928                         if ($gserver["created"] <= NULL_DATE) {
 929                                 $fields = ['created' => DateTimeFormat::utcNow()];
 930                                 $condition = ['nurl' => normalise_link($server_url)];
 931                                 DBA::update('gserver', $fields, $condition);
 932                         }
 933                         $poco = $gserver["poco"];
 934                         $noscrape = $gserver["noscrape"];
 935
 936                         if ($network == "") {
 937                                 $network = $gserver["network"];
 938                         }
 939
 940                         $last_contact = $gserver["last_contact"];
 941                         $last_failure = $gserver["last_failure"];
 942                         $version = $gserver["version"];
 943                         $platform = $gserver["platform"];
 944                         $site_name = $gserver["site_name"];
 945                         $info = $gserver["info"];
 946                         $register_policy = $gserver["register_policy"];
 947                         $registered_users = $gserver["registered-users"];
 948
 949                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 950                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 951                         if ($last_contact < NULL_DATE) {
 952                                 $last_contact = NULL_DATE;
 953                         }
 954
 955                         if ($last_failure < NULL_DATE) {
 956                                 $last_failure = NULL_DATE;
 957                         }
 958
 959                         if (!$force && !self::updateNeeded($gserver["created"], "", $last_failure, $last_contact)) {
 960                                 logger("Use cached data for server ".$server_url, LOGGER_DEBUG);
 961                                 return ($last_contact >= $last_failure);
 962                         }
 963                 } else {
 964                         $poco = "";
 965                         $noscrape = "";
 966                         $version = "";
 967                         $platform = "";
 968                         $site_name = "";
 969                         $info = "";
 970                         $register_policy = -1;
 971                         $registered_users = 0;
 972
 973                         $last_contact = NULL_DATE;
 974                         $last_failure = NULL_DATE;
 975                 }
 976                 logger("Server ".$server_url." is outdated or unknown. Start discovery. Force: ".$force." Created: ".$gserver["created"]." Failure: ".$last_failure." Contact: ".$last_contact, LOGGER_DEBUG);
 977
 978                 $failure = false;
 979                 $possible_failure = false;
 980                 $orig_last_failure = $last_failure;
 981                 $orig_last_contact = $last_contact;
 982
 983                 // Mastodon uses the "@" for user profiles.
 984                 // But this can be misunderstood.
 985                 if (parse_url($server_url, PHP_URL_USER) != '') {
 986                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
 987                         return false;
 988                 }
 989
 990                 // Check if the page is accessible via SSL.
 991                 $orig_server_url = $server_url;
 992                 $server_url = str_replace("http://", "https://", $server_url);
 993
 994                 // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
 995                 $serverret = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
 996
 997                 // Quit if there is a timeout.
 998                 // But we want to make sure to only quit if we are mostly sure that this server url fits.
 999                 if (DBA::isResult($gserver) && ($orig_server_url == $server_url) &&
1000                         (!empty($serverret["errno"]) && ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT))) {
1001                         logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
1002                         DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
1003                         return false;
1004                 }
1005
1006                 // Maybe the page is unencrypted only?
1007                 $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1008                 if (!$serverret["success"] || ($serverret["body"] == "") || empty($xmlobj) || !is_object($xmlobj)) {
1009                         $server_url = str_replace("https://", "http://", $server_url);
1010
1011                         // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
1012                         $serverret = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
1013
1014                         // Quit if there is a timeout
1015                         if (!empty($serverret["errno"]) && ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT)) {
1016                                 logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
1017                                 DBA::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
1018                                 return false;
1019                         }
1020
1021                         $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1022                 }
1023
1024                 if (!$serverret["success"] || ($serverret["body"] == "") || empty($xmlobj) || !is_object($xmlobj)) {
1025                         // Workaround for bad configured servers (known nginx problem)
1026                         if (!empty($serverret["debug"]) && !in_array($serverret["debug"]["http_code"], ["403", "404"])) {
1027                                 $failure = true;
1028                         }
1029
1030                         $possible_failure = true;
1031                 }
1032
1033                 // If the server has no possible failure we reset the cached data
1034                 if (!$possible_failure) {
1035                         $version = "";
1036                         $platform = "";
1037                         $site_name = "";
1038                         $info = "";
1039                         $register_policy = -1;
1040                 }
1041
1042                 if (!$failure) {
1043                         // This will be too low, but better than no value at all.
1044                         $registered_users = DBA::count('gcontact', ['server_url' => normalise_link($server_url)]);
1045                 }
1046
1047                 // Look for poco
1048                 if (!$failure) {
1049                         $serverret = Network::curl($server_url."/poco");
1050
1051                         if ($serverret["success"]) {
1052                                 $data = json_decode($serverret["body"], true);
1053
1054                                 if (isset($data['totalResults'])) {
1055                                         $registered_users = $data['totalResults'];
1056                                         $poco = $server_url . "/poco";
1057                                         $server = self::detectPocoData($data);
1058
1059                                         if (!empty($server)) {
1060                                                 $platform = $server['platform'];
1061                                                 $network = $server['network'];
1062                                                 $version = '';
1063                                                 $site_name = '';
1064                                         }
1065                                 }
1066
1067                                 /*
1068                                  * There are servers out there who don't return 404 on a failure
1069                                  * We have to be sure that don't misunderstand this
1070                                  */
1071                                 if (is_null($data)) {
1072                                         $poco = "";
1073                                         $noscrape = "";
1074                                         $network = "";
1075                                 }
1076                         }
1077                 }
1078
1079                 if (!$failure) {
1080                         // Test for Diaspora, Hubzilla, Mastodon or older Friendica servers
1081                         $serverret = Network::curl($server_url);
1082
1083                         if (!$serverret["success"] || ($serverret["body"] == "")) {
1084                                 $failure = true;
1085                         } else {
1086                                 $server = self::detectServerType($serverret["body"]);
1087
1088                                 if (!empty($server)) {
1089                                         $platform = $server['platform'];
1090                                         $network = $server['network'];
1091                                         $version = $server['version'];
1092                                         $site_name = $server['site_name'];
1093                                 }
1094
1095                                 $lines = explode("\n", $serverret["header"]);
1096
1097                                 if (count($lines)) {
1098                                         foreach ($lines as $line) {
1099                                                 $line = trim($line);
1100
1101                                                 if (stristr($line, 'X-Diaspora-Version:')) {
1102                                                         $platform = "Diaspora";
1103                                                         $version = trim(str_replace("X-Diaspora-Version:", "", $line));
1104                                                         $version = trim(str_replace("x-diaspora-version:", "", $version));
1105                                                         $network = NETWORK_DIASPORA;
1106                                                         $versionparts = explode("-", $version);
1107                                                         $version = $versionparts[0];
1108                                                 }
1109
1110                                                 if (stristr($line, 'Server: Mastodon')) {
1111                                                         $platform = "Mastodon";
1112                                                         $network = NETWORK_OSTATUS;
1113                                                 }
1114                                         }
1115                                 }
1116                         }
1117                 }
1118
1119                 if (!$failure && ($poco == "")) {
1120                         // Test for Statusnet
1121                         // Will also return data for Friendica and GNU Social - but it will be overwritten later
1122                         // The "not implemented" is a special treatment for really, really old Friendica versions
1123                         $serverret = Network::curl($server_url."/api/statusnet/version.json");
1124
1125                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
1126                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
1127                                 $platform = "StatusNet";
1128                                 // Remove junk that some GNU Social servers return
1129                                 $version = str_replace(chr(239).chr(187).chr(191), "", $serverret["body"]);
1130                                 $version = trim($version, '"');
1131                                 $network = NETWORK_OSTATUS;
1132                         }
1133
1134                         // Test for GNU Social
1135                         $serverret = Network::curl($server_url."/api/gnusocial/version.json");
1136
1137                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
1138                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
1139                                 $platform = "GNU Social";
1140                                 // Remove junk that some GNU Social servers return
1141                                 $version = str_replace(chr(239) . chr(187) . chr(191), "", $serverret["body"]);
1142                                 $version = trim($version, '"');
1143                                 $network = NETWORK_OSTATUS;
1144                         }
1145
1146                         // Test for Mastodon
1147                         $orig_version = $version;
1148                         $serverret = Network::curl($server_url . "/api/v1/instance");
1149
1150                         if ($serverret["success"] && ($serverret["body"] != '')) {
1151                                 $data = json_decode($serverret["body"], true);
1152
1153                                 if (isset($data['version'])) {
1154                                         $platform = "Mastodon";
1155                                         $version = $data['version'];
1156                                         $site_name = $data['title'];
1157                                         $info = $data['description'];
1158                                         $network = NETWORK_OSTATUS;
1159                                 }
1160
1161                                 if (!empty($data['stats']['user_count'])) {
1162                                         $registered_users = $data['stats']['user_count'];
1163                                 }
1164                         }
1165
1166                         if (strstr($orig_version . $version, 'Pleroma')) {
1167                                 $platform = 'Pleroma';
1168                                 $version = trim(str_replace('Pleroma', '', $version));
1169                         }
1170                 }
1171
1172                 if (!$failure) {
1173                         // Test for Hubzilla and Red
1174                         $serverret = Network::curl($server_url . "/siteinfo.json");
1175
1176                         if ($serverret["success"]) {
1177                                 $data = json_decode($serverret["body"], true);
1178
1179                                 if (isset($data['url'])) {
1180                                         $platform = $data['platform'];
1181                                         $version = $data['version'];
1182                                         $network = NETWORK_DIASPORA;
1183                                 }
1184
1185                                 if (!empty($data['site_name'])) {
1186                                         $site_name = $data['site_name'];
1187                                 }
1188
1189                                 if (!empty($data['channels_total'])) {
1190                                         $registered_users = $data['channels_total'];
1191                                 }
1192
1193                                 if (!empty($data['register_policy'])) {
1194                                         switch ($data['register_policy']) {
1195                                                 case "REGISTER_OPEN":
1196                                                         $register_policy = REGISTER_OPEN;
1197                                                         break;
1198
1199                                                 case "REGISTER_APPROVE":
1200                                                         $register_policy = REGISTER_APPROVE;
1201                                                         break;
1202
1203                                                 case "REGISTER_CLOSED":
1204                                                 default:
1205                                                         $register_policy = REGISTER_CLOSED;
1206                                                         break;
1207                                         }
1208                                 }
1209                         } else {
1210                                 // Test for Hubzilla, Redmatrix or Friendica
1211                                 $serverret = Network::curl($server_url."/api/statusnet/config.json");
1212
1213                                 if ($serverret["success"]) {
1214                                         $data = json_decode($serverret["body"], true);
1215
1216                                         if (isset($data['site']['server'])) {
1217                                                 if (isset($data['site']['platform'])) {
1218                                                         $platform = $data['site']['platform']['PLATFORM_NAME'];
1219                                                         $version = $data['site']['platform']['STD_VERSION'];
1220                                                         $network = NETWORK_DIASPORA;
1221                                                 }
1222
1223                                                 if (isset($data['site']['BlaBlaNet'])) {
1224                                                         $platform = $data['site']['BlaBlaNet']['PLATFORM_NAME'];
1225                                                         $version = $data['site']['BlaBlaNet']['STD_VERSION'];
1226                                                         $network = NETWORK_DIASPORA;
1227                                                 }
1228
1229                                                 if (isset($data['site']['hubzilla'])) {
1230                                                         $platform = $data['site']['hubzilla']['PLATFORM_NAME'];
1231                                                         $version = $data['site']['hubzilla']['RED_VERSION'];
1232                                                         $network = NETWORK_DIASPORA;
1233                                                 }
1234
1235                                                 if (isset($data['site']['redmatrix'])) {
1236                                                         if (isset($data['site']['redmatrix']['PLATFORM_NAME'])) {
1237                                                                 $platform = $data['site']['redmatrix']['PLATFORM_NAME'];
1238                                                         } elseif (isset($data['site']['redmatrix']['RED_PLATFORM'])) {
1239                                                                 $platform = $data['site']['redmatrix']['RED_PLATFORM'];
1240                                                         }
1241
1242                                                         $version = $data['site']['redmatrix']['RED_VERSION'];
1243                                                         $network = NETWORK_DIASPORA;
1244                                                 }
1245
1246                                                 if (isset($data['site']['friendica'])) {
1247                                                         $platform = $data['site']['friendica']['FRIENDICA_PLATFORM'];
1248                                                         $version = $data['site']['friendica']['FRIENDICA_VERSION'];
1249                                                         $network = NETWORK_DFRN;
1250                                                 }
1251
1252                                                 $site_name = $data['site']['name'];
1253
1254                                                 $private = false;
1255                                                 $inviteonly = false;
1256                                                 $closed = false;
1257
1258                                                 if (!empty($data['site']['closed'])) {
1259                                                         $closed = self::toBoolean($data['site']['closed']);
1260                                                 }
1261
1262                                                 if (!empty($data['site']['private'])) {
1263                                                         $private = self::toBoolean($data['site']['private']);
1264                                                 }
1265
1266                                                 if (!empty($data['site']['inviteonly'])) {
1267                                                         $inviteonly = self::toBoolean($data['site']['inviteonly']);
1268                                                 }
1269
1270                                                 if (!$closed && !$private and $inviteonly) {
1271                                                         $register_policy = REGISTER_APPROVE;
1272                                                 } elseif (!$closed && !$private) {
1273                                                         $register_policy = REGISTER_OPEN;
1274                                                 } else {
1275                                                         $register_policy = REGISTER_CLOSED;
1276                                                 }
1277                                         }
1278                                 }
1279                         }
1280                 }
1281
1282                 // Query statistics.json. Optional package for Diaspora, Friendica and Redmatrix
1283                 if (!$failure) {
1284                         $serverret = Network::curl($server_url . "/statistics.json");
1285
1286                         if ($serverret["success"]) {
1287                                 $data = json_decode($serverret["body"], true);
1288
1289                                 if (isset($data['version'])) {
1290                                         $version = $data['version'];
1291                                         // Version numbers on statistics.json are presented with additional info, e.g.:
1292                                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
1293                                         $version = preg_replace("=(.+)-(.{4,})=ism", "$1", $version);
1294                                 }
1295
1296                                 if (!empty($data['name'])) {
1297                                         $site_name = $data['name'];
1298                                 }
1299
1300                                 if (!empty($data['network'])) {
1301                                         $platform = $data['network'];
1302                                 }
1303
1304                                 if ($platform == "Diaspora") {
1305                                         $network = NETWORK_DIASPORA;
1306                                 }
1307
1308                                 if (!empty($data['registrations_open']) && $data['registrations_open']) {
1309                                         $register_policy = REGISTER_OPEN;
1310                                 } else {
1311                                         $register_policy = REGISTER_CLOSED;
1312                                 }
1313                         }
1314                 }
1315
1316                 // Query nodeinfo. Working for (at least) Diaspora and Friendica.
1317                 if (!$failure) {
1318                         $server = self::fetchNodeinfo($server_url);
1319
1320                         if (!empty($server)) {
1321                                 $register_policy = $server['register_policy'];
1322
1323                                 if (isset($server['platform'])) {
1324                                         $platform = $server['platform'];
1325                                 }
1326
1327                                 if (isset($server['network'])) {
1328                                         $network = $server['network'];
1329                                 }
1330
1331                                 if (isset($server['version'])) {
1332                                         $version = $server['version'];
1333                                 }
1334
1335                                 if (isset($server['site_name'])) {
1336                                         $site_name = $server['site_name'];
1337                                 }
1338
1339                                 if (isset($server['registered-users'])) {
1340                                         $registered_users = $server['registered-users'];
1341                                 }
1342                         }
1343                 }
1344
1345                 // Check for noscrape
1346                 // Friendica servers could be detected as OStatus servers
1347                 if (!$failure && in_array($network, [NETWORK_DFRN, NETWORK_OSTATUS])) {
1348                         $serverret = Network::curl($server_url . "/friendica/json");
1349
1350                         if (!$serverret["success"]) {
1351                                 $serverret = Network::curl($server_url . "/friendika/json");
1352                         }
1353
1354                         if ($serverret["success"]) {
1355                                 $data = json_decode($serverret["body"], true);
1356
1357                                 if (isset($data['version'])) {
1358                                         $network = NETWORK_DFRN;
1359
1360                                         if (!empty($data['no_scrape_url'])) {
1361                                                 $noscrape = $data['no_scrape_url'];
1362                                         }
1363
1364                                         $version = $data['version'];
1365
1366                                         if (!empty($data['site_name'])) {
1367                                                 $site_name = $data['site_name'];
1368                                         }
1369
1370                                         $info = $data['info'];
1371                                         $register_policy = constant($data['register_policy']);
1372                                         $platform = $data['platform'];
1373                                 }
1374                         }
1375                 }
1376
1377                 // Every server has got at least an admin account
1378                 if (!$failure && ($registered_users == 0)) {
1379                         $registered_users = 1;
1380                 }
1381
1382                 if ($possible_failure && !$failure) {
1383                         $failure = true;
1384                 }
1385
1386                 if ($failure) {
1387                         $last_contact = $orig_last_contact;
1388                         $last_failure = DateTimeFormat::utcNow();
1389                 } else {
1390                         $last_contact = DateTimeFormat::utcNow();
1391                         $last_failure = $orig_last_failure;
1392                 }
1393
1394                 if (($last_contact <= $last_failure) && !$failure) {
1395                         logger("Server ".$server_url." seems to be alive, but last contact wasn't set - could be a bug", LOGGER_DEBUG);
1396                 } elseif (($last_contact >= $last_failure) && $failure) {
1397                         logger("Server ".$server_url." seems to be dead, but last failure wasn't set - could be a bug", LOGGER_DEBUG);
1398                 }
1399
1400                 // Check again if the server exists
1401                 $found = DBA::exists('gserver', ['nurl' => normalise_link($server_url)]);
1402
1403                 $version = strip_tags($version);
1404                 $site_name = strip_tags($site_name);
1405                 $info = strip_tags($info);
1406                 $platform = strip_tags($platform);
1407
1408                 $fields = ['url' => $server_url, 'version' => $version,
1409                                 'site_name' => $site_name, 'info' => $info, 'register_policy' => $register_policy,
1410                                 'poco' => $poco, 'noscrape' => $noscrape, 'network' => $network,
1411                                 'platform' => $platform, 'registered-users' => $registered_users,
1412                                 'last_contact' => $last_contact, 'last_failure' => $last_failure];
1413
1414                 if ($found) {
1415                         DBA::update('gserver', $fields, ['nurl' => normalise_link($server_url)]);
1416                 } elseif (!$failure) {
1417                         $fields['nurl'] = normalise_link($server_url);
1418                         $fields['created'] = DateTimeFormat::utcNow();
1419                         DBA::insert('gserver', $fields);
1420                 }
1421
1422                 if (!$failure && in_array($fields['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
1423                         self::discoverRelay($server_url);
1424                 }
1425
1426                 logger("End discovery for server " . $server_url, LOGGER_DEBUG);
1427
1428                 return !$failure;
1429         }
1430
1431         /**
1432          * @brief Fetch relay data from a given server url
1433          *
1434          * @param string $server_url address of the server
1435          */
1436         private static function discoverRelay($server_url)
1437         {
1438                 logger("Discover relay data for server " . $server_url, LOGGER_DEBUG);
1439
1440                 $serverret = Network::curl($server_url . "/.well-known/x-social-relay");
1441
1442                 if (!$serverret["success"]) {
1443                         return;
1444                 }
1445
1446                 $data = json_decode($serverret['body'], true);
1447
1448                 if (!is_array($data)) {
1449                         return;
1450                 }
1451
1452                 $gserver = DBA::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => normalise_link($server_url)]);
1453
1454                 if (!DBA::isResult($gserver)) {
1455                         return;
1456                 }
1457
1458                 if (($gserver['relay-subscribe'] != $data['subscribe']) || ($gserver['relay-scope'] != $data['scope'])) {
1459                         $fields = ['relay-subscribe' => $data['subscribe'], 'relay-scope' => $data['scope']];
1460                         DBA::update('gserver', $fields, ['id' => $gserver['id']]);
1461                 }
1462
1463                 DBA::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
1464
1465                 if ($data['scope'] == 'tags') {
1466                         // Avoid duplicates
1467                         $tags = [];
1468                         foreach ($data['tags'] as $tag) {
1469                                 $tag = mb_strtolower($tag);
1470                                 $tags[$tag] = $tag;
1471                         }
1472
1473                         foreach ($tags as $tag) {
1474                                 DBA::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag], true);
1475                         }
1476                 }
1477
1478                 // Create or update the relay contact
1479                 $fields = [];
1480                 if (isset($data['protocols'])) {
1481                         if (isset($data['protocols']['diaspora'])) {
1482                                 $fields['network'] = NETWORK_DIASPORA;
1483
1484                                 if (isset($data['protocols']['diaspora']['receive'])) {
1485                                         $fields['batch'] = $data['protocols']['diaspora']['receive'];
1486                                 } elseif (is_string($data['protocols']['diaspora'])) {
1487                                         $fields['batch'] = $data['protocols']['diaspora'];
1488                                 }
1489                         }
1490
1491                         if (isset($data['protocols']['dfrn'])) {
1492                                 $fields['network'] = NETWORK_DFRN;
1493
1494                                 if (isset($data['protocols']['dfrn']['receive'])) {
1495                                         $fields['batch'] = $data['protocols']['dfrn']['receive'];
1496                                 } elseif (is_string($data['protocols']['dfrn'])) {
1497                                         $fields['batch'] = $data['protocols']['dfrn'];
1498                                 }
1499                         }
1500                 }
1501                 Diaspora::setRelayContact($server_url, $fields);
1502         }
1503
1504         /**
1505          * @brief Returns a list of all known servers
1506          * @return array List of server urls
1507          */
1508         public static function serverlist()
1509         {
1510                 $r = q(
1511                         "SELECT `url`, `site_name` AS `displayName`, `network`, `platform`, `version` FROM `gserver`
1512                         WHERE `network` IN ('%s', '%s', '%s') AND `last_contact` > `last_failure`
1513                         ORDER BY `last_contact`
1514                         LIMIT 1000",
1515                         DBA::escape(NETWORK_DFRN),
1516                         DBA::escape(NETWORK_DIASPORA),
1517                         DBA::escape(NETWORK_OSTATUS)
1518                 );
1519
1520                 if (!DBA::isResult($r)) {
1521                         return false;
1522                 }
1523
1524                 return $r;
1525         }
1526
1527         /**
1528          * @brief Fetch server list from remote servers and adds them when they are new.
1529          *
1530          * @param string $poco URL to the POCO endpoint
1531          */
1532         private static function fetchServerlist($poco)
1533         {
1534                 $serverret = Network::curl($poco . "/@server");
1535
1536                 if (!$serverret["success"]) {
1537                         return;
1538                 }
1539
1540                 $serverlist = json_decode($serverret['body'], true);
1541
1542                 if (!is_array($serverlist)) {
1543                         return;
1544                 }
1545
1546                 foreach ($serverlist as $server) {
1547                         $server_url = str_replace("/index.php", "", $server['url'];
1548
1549                         $r = q("SELECT `nurl` FROM `gserver` WHERE `nurl` = '%s'", DBA::escape(normalise_link($server_url)));
1550
1551                         if (!DBA::isResult($r)) {
1552                                 logger("Call server check for server ".$server_url, LOGGER_DEBUG);
1553                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $server_url);
1554                         }
1555                 }
1556         }
1557
1558         private static function discoverFederation()
1559         {
1560                 $last = Config::get('poco', 'last_federation_discovery');
1561
1562                 if ($last) {
1563                         $next = $last + (24 * 60 * 60);
1564
1565                         if ($next > time()) {
1566                                 return;
1567                         }
1568                 }
1569
1570                 // Discover Friendica, Hubzilla and Diaspora servers
1571                 $serverdata = Network::fetchUrl("http://the-federation.info/pods.json");
1572
1573                 if (!empty($serverdata)) {
1574                         $servers = json_decode($serverdata, true);
1575
1576                         if (!empty($servers['pods'])) {
1577                                 foreach ($servers['pods'] as $server) {
1578                                         Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://" . $server['host']);
1579                                 }
1580                         }
1581                 }
1582
1583                 // Disvover Mastodon servers
1584                 if (!Config::get('system', 'ostatus_disabled')) {
1585                         $accesstoken = Config::get('system', 'instances_social_key');
1586
1587                         if (!empty($accesstoken)) {
1588                                 $api = 'https://instances.social/api/1.0/instances/list?count=0';
1589                                 $header = ['Authorization: Bearer '.$accesstoken];
1590                                 $serverdata = Network::curl($api, false, $redirects, ['headers' => $header]);
1591
1592                                 if ($serverdata['success']) {
1593                                         $servers = json_decode($serverdata['body'], true);
1594
1595                                         foreach ($servers['instances'] as $server) {
1596                                                 $url = (is_null($server['https_score']) ? 'http' : 'https') . '://' . $server['name'];
1597                                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $url);
1598                                         }
1599                                 }
1600                         }
1601                 }
1602
1603                 // Currently disabled, since the service isn't available anymore.
1604                 // It is not removed since I hope that there will be a successor.
1605                 // Discover GNU Social Servers.
1606                 //if (!Config::get('system','ostatus_disabled')) {
1607                 //      $serverdata = "http://gstools.org/api/get_open_instances/";
1608
1609                 //      $result = Network::curl($serverdata);
1610                 //      if ($result["success"]) {
1611                 //              $servers = json_decode($result["body"], true);
1612
1613                 //              foreach($servers['data'] as $server)
1614                 //                      self::checkServer($server['instance_address']);
1615                 //      }
1616                 //}
1617
1618                 Config::set('poco', 'last_federation_discovery', time());
1619         }
1620
1621         public static function discoverSingleServer($id)
1622         {
1623                 $r = q("SELECT `poco`, `nurl`, `url`, `network` FROM `gserver` WHERE `id` = %d", intval($id));
1624
1625                 if (!DBA::isResult($r)) {
1626                         return false;
1627                 }
1628
1629                 $server = $r[0];
1630
1631                 // Discover new servers out there (Works from Friendica version 3.5.2)
1632                 self::fetchServerlist($server["poco"]);
1633
1634                 // Fetch all users from the other server
1635                 $url = $server["poco"] . "/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1636
1637                 logger("Fetch all users from the server " . $server["url"], LOGGER_DEBUG);
1638
1639                 $retdata = Network::curl($url);
1640
1641                 if ($retdata["success"]) {
1642                         $data = json_decode($retdata["body"], true);
1643
1644                         self::discoverServer($data, 2);
1645
1646                         if (Config::get('system', 'poco_discovery') > 1) {
1647                                 $timeframe = Config::get('system', 'poco_discovery_since');
1648
1649                                 if ($timeframe == 0) {
1650                                         $timeframe = 30;
1651                                 }
1652
1653                                 $updatedSince = date(DateTimeFormat::MYSQL, time() - $timeframe * 86400);
1654
1655                                 // Fetch all global contacts from the other server (Not working with Redmatrix and Friendica versions before 3.3)
1656                                 $url = $server["poco"]."/@global?updatedSince=".$updatedSince."&fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1657
1658                                 $success = false;
1659
1660                                 $retdata = Network::curl($url);
1661
1662                                 if ($retdata["success"]) {
1663                                         logger("Fetch all global contacts from the server " . $server["nurl"], LOGGER_DEBUG);
1664                                         $success = self::discoverServer(json_decode($retdata["body"], true));
1665                                 }
1666
1667                                 if (!$success && (Config::get('system', 'poco_discovery') > 2)) {
1668                                         logger("Fetch contacts from users of the server " . $server["nurl"], LOGGER_DEBUG);
1669                                         self::discoverServerUsers($data, $server);
1670                                 }
1671                         }
1672
1673                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1674                         DBA::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1675
1676                         return true;
1677                 } else {
1678                         // If the server hadn't replied correctly, then force a sanity check
1679                         self::checkServer($server["url"], $server["network"], true);
1680
1681                         // If we couldn't reach the server, we will try it some time later
1682                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1683                         DBA::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1684
1685                         return false;
1686                 }
1687         }
1688
1689         public static function discover($complete = false)
1690         {
1691                 // Update the server list
1692                 self::discoverFederation();
1693
1694                 $no_of_queries = 5;
1695
1696                 $requery_days = intval(Config::get('system', 'poco_requery_days'));
1697
1698                 if ($requery_days == 0) {
1699                         $requery_days = 7;
1700                 }
1701
1702                 $last_update = date('c', time() - (60 * 60 * 24 * $requery_days));
1703
1704                 $gservers = q("SELECT `id`, `url`, `nurl`, `network`
1705                         FROM `gserver`
1706                         WHERE `last_contact` >= `last_failure`
1707                         AND `poco` != ''
1708                         AND `last_poco_query` < '%s'
1709                         ORDER BY RAND()", DBA::escape($last_update)
1710                 );
1711
1712                 if (DBA::isResult($gservers)) {
1713                         foreach ($gservers as $gserver) {
1714                                 if (!self::checkServer($gserver['url'], $gserver['network'])) {
1715                                         // The server is not reachable? Okay, then we will try it later
1716                                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1717                                         DBA::update('gserver', $fields, ['nurl' => $gserver['nurl']]);
1718                                         continue;
1719                                 }
1720
1721                                 logger('Update directory from server ' . $gserver['url'] . ' with ID ' . $gserver['id'], LOGGER_DEBUG);
1722                                 Worker::add(PRIORITY_LOW, 'DiscoverPoCo', 'update_server_directory', (int) $gserver['id']);
1723
1724                                 if (!$complete && ( --$no_of_queries == 0)) {
1725                                         break;
1726                                 }
1727                         }
1728                 }
1729         }
1730
1731         private static function discoverServerUsers(array $data, array $server)
1732         {
1733                 if (!isset($data['entry'])) {
1734                         return;
1735                 }
1736
1737                 foreach ($data['entry'] as $entry) {
1738                         $username = '';
1739
1740                         if (isset($entry['urls'])) {
1741                                 foreach ($entry['urls'] as $url) {
1742                                         if ($url['type'] == 'profile') {
1743                                                 $profile_url = $url['value'];
1744                                                 $path_array = explode('/', parse_url($profile_url, PHP_URL_PATH));
1745                                                 $username = end($path_array);
1746                                         }
1747                                 }
1748                         }
1749
1750                         if ($username != '') {
1751                                 logger('Fetch contacts for the user ' . $username . ' from the server ' . $server['nurl'], LOGGER_DEBUG);
1752
1753                                 // Fetch all contacts from a given user from the other server
1754                                 $url = $server['poco'] . '/' . $username . '/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation';
1755
1756                                 $retdata = Network::curl($url);
1757
1758                                 if (!empty($retdata['success'])) {
1759                                         self::discoverServer(json_decode($retdata['body'], true), 3);
1760                                 }
1761                         }
1762                 }
1763         }
1764
1765         private static function discoverServer(array $data, $default_generation = 0)
1766         {
1767                 if (empty($data['entry'])) {
1768                         return false;
1769                 }
1770
1771                 $success = false;
1772
1773                 foreach ($data['entry'] as $entry) {
1774                         $profile_url = '';
1775                         $profile_photo = '';
1776                         $connect_url = '';
1777                         $name = '';
1778                         $network = '';
1779                         $updated = NULL_DATE;
1780                         $location = '';
1781                         $about = '';
1782                         $keywords = '';
1783                         $gender = '';
1784                         $contact_type = -1;
1785                         $generation = $default_generation;
1786
1787                         if (!empty($entry['displayName'])) {
1788                                 $name = $entry['displayName'];
1789                         }
1790
1791                         if (isset($entry['urls'])) {
1792                                 foreach ($entry['urls'] as $url) {
1793                                         if ($url['type'] == 'profile') {
1794                                                 $profile_url = $url['value'];
1795                                                 continue;
1796                                         }
1797                                         if ($url['type'] == 'webfinger') {
1798                                                 $connect_url = str_replace('acct:' , '', $url['value']);
1799                                                 continue;
1800                                         }
1801                                 }
1802                         }
1803
1804                         if (isset($entry['photos'])) {
1805                                 foreach ($entry['photos'] as $photo) {
1806                                         if ($photo['type'] == 'profile') {
1807                                                 $profile_photo = $photo['value'];
1808                                                 continue;
1809                                         }
1810                                 }
1811                         }
1812
1813                         if (isset($entry['updated'])) {
1814                                 $updated = date(DateTimeFormat::MYSQL, strtotime($entry['updated']));
1815                         }
1816
1817                         if (isset($entry['network'])) {
1818                                 $network = $entry['network'];
1819                         }
1820
1821                         if (isset($entry['currentLocation'])) {
1822                                 $location = $entry['currentLocation'];
1823                         }
1824
1825                         if (isset($entry['aboutMe'])) {
1826                                 $about = HTML::toBBCode($entry['aboutMe']);
1827                         }
1828
1829                         if (isset($entry['gender'])) {
1830                                 $gender = $entry['gender'];
1831                         }
1832
1833                         if (isset($entry['generation']) && ($entry['generation'] > 0)) {
1834                                 $generation = ++$entry['generation'];
1835                         }
1836
1837                         if (isset($entry['contactType']) && ($entry['contactType'] >= 0)) {
1838                                 $contact_type = $entry['contactType'];
1839                         }
1840
1841                         if (isset($entry['tags'])) {
1842                                 foreach ($entry['tags'] as $tag) {
1843                                         $keywords = implode(", ", $tag);
1844                                 }
1845                         }
1846
1847                         if ($generation > 0) {
1848                                 $success = true;
1849
1850                                 logger("Store profile ".$profile_url, LOGGER_DEBUG);
1851
1852                                 $gcontact = ["url" => $profile_url,
1853                                                 "name" => $name,
1854                                                 "network" => $network,
1855                                                 "photo" => $profile_photo,
1856                                                 "about" => $about,
1857                                                 "location" => $location,
1858                                                 "gender" => $gender,
1859                                                 "keywords" => $keywords,
1860                                                 "connect" => $connect_url,
1861                                                 "updated" => $updated,
1862                                                 "contact-type" => $contact_type,
1863                                                 "generation" => $generation];
1864
1865                                 try {
1866                                         $gcontact = GContact::sanitize($gcontact);
1867                                         GContact::update($gcontact);
1868                                 } catch (Exception $e) {
1869                                         logger($e->getMessage(), LOGGER_DEBUG);
1870                                 }
1871
1872                                 logger("Done for profile ".$profile_url, LOGGER_DEBUG);
1873                         }
1874                 }
1875                 return $success;
1876         }
1877
1878 }