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