src/Protocol/PortableContact.php

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