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