src/Protocol/PortableContact.php

   1 <?php
   2 /**
   3  * @file src/Protocol/PortableContact.php
   4  *
   5  * @todo Move GNU Social URL schemata (http://server.tld/user/number) to http://server.tld/username
   6  * @todo Fetch profile data from profile page for Redmatrix users
   7  * @todo Detect if it is a forum
   8  */
   9
  10 namespace Friendica\Protocol;
  11
  12 use Friendica\Core\Config;
  13 use Friendica\Core\Worker;
  14 use Friendica\Database\DBM;
  15 use Friendica\Model\GContact;
  16 use Friendica\Model\Profile;
  17 use Friendica\Network\Probe;
  18 use Friendica\Util\Network;
  19 use dba;
  20 use DOMDocument;
  21 use DOMXPath;
  22 use Exception;
  23
  24 require_once 'include/dba.php';
  25 require_once 'include/datetime.php';
  26 require_once 'include/network.php';
  27 require_once 'include/html2bbcode.php';
  28
  29 class PortableContact
  30 {
  31         /**
  32          * @brief Fetch POCO data
  33          *
  34          * @param integer $cid  Contact ID
  35          * @param integer $uid  User ID
  36          * @param integer $zcid Global Contact ID
  37          * @param integer $url  POCO address that should be polled
  38          *
  39          * Given a contact-id (minimum), load the PortableContacts friend list for that contact,
  40          * and add the entries to the gcontact (Global Contact) table, or update existing entries
  41          * if anything (name or photo) has changed.
  42          * We use normalised urls for comparison which ignore http vs https and www.domain vs domain
  43          *
  44          * Once the global contact is stored add (if necessary) the contact linkage which associates
  45          * the given uid, cid to the global contact entry. There can be many uid/cid combinations
  46          * pointing to the same global contact id.
  47          *
  48          */
  49         public static function loadWorker($cid, $uid = 0, $zcid = 0, $url = null)
  50         {
  51                 // Call the function "load" via the worker
  52                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "load", (int)$cid, (int)$uid, (int)$zcid, $url);
  53         }
  54
  55         /**
  56          * @brief Fetch POCO data from the worker
  57          *
  58          * @param integer $cid  Contact ID
  59          * @param integer $uid  User ID
  60          * @param integer $zcid Global Contact ID
  61          * @param integer $url  POCO address that should be polled
  62          *
  63          */
  64         public static function load($cid, $uid, $zcid, $url)
  65         {
  66                 $a = get_app();
  67
  68                 if ($cid) {
  69                         if (!$url || !$uid) {
  70                                 $contact = dba::selectFirst('contact', ['poco', 'uid'], ['id' => $cid]);
  71                                 if (DBM::is_result($contact)) {
  72                                         $url = $contact['poco'];
  73                                         $uid = $contact['uid'];
  74                                 }
  75                         }
  76                         if (!$uid) {
  77                                 return;
  78                         }
  79                 }
  80
  81                 if (!$url) {
  82                         return;
  83                 }
  84
  85                 $url = $url . (($uid) ? '/@me/@all?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation' : '?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation') ;
  86
  87                 logger('load: ' . $url, LOGGER_DEBUG);
  88
  89                 $s = Network::fetchURL($url);
  90
  91                 logger('load: returns ' . $s, LOGGER_DATA);
  92
  93                 logger('load: return code: ' . $a->get_curl_code(), LOGGER_DEBUG);
  94
  95                 if (($a->get_curl_code() > 299) || (! $s)) {
  96                         return;
  97                 }
  98
  99                 $j = json_decode($s);
 100
 101                 logger('load: json: ' . print_r($j, true), LOGGER_DATA);
 102
 103                 if (! isset($j->entry)) {
 104                         return;
 105                 }
 106
 107                 $total = 0;
 108                 foreach ($j->entry as $entry) {
 109                         $total ++;
 110                         $profile_url = '';
 111                         $profile_photo = '';
 112                         $connect_url = '';
 113                         $name = '';
 114                         $network = '';
 115                         $updated = NULL_DATE;
 116                         $location = '';
 117                         $about = '';
 118                         $keywords = '';
 119                         $gender = '';
 120                         $contact_type = -1;
 121                         $generation = 0;
 122
 123                         $name = $entry->displayName;
 124
 125                         if (isset($entry->urls)) {
 126                                 foreach ($entry->urls as $url) {
 127                                         if ($url->type == 'profile') {
 128                                                 $profile_url = $url->value;
 129                                                 continue;
 130                                         }
 131                                         if ($url->type == 'webfinger') {
 132                                                 $connect_url = str_replace('acct:', '', $url->value);
 133                                                 continue;
 134                                         }
 135                                 }
 136                         }
 137                         if (isset($entry->photos)) {
 138                                 foreach ($entry->photos as $photo) {
 139                                         if ($photo->type == 'profile') {
 140                                                 $profile_photo = $photo->value;
 141                                                 continue;
 142                                         }
 143                                 }
 144                         }
 145
 146                         if (isset($entry->updated)) {
 147                                 $updated = date("Y-m-d H:i:s", strtotime($entry->updated));
 148                         }
 149
 150                         if (isset($entry->network)) {
 151                                 $network = $entry->network;
 152                         }
 153
 154                         if (isset($entry->currentLocation)) {
 155                                 $location = $entry->currentLocation;
 156                         }
 157
 158                         if (isset($entry->aboutMe)) {
 159                                 $about = html2bbcode($entry->aboutMe);
 160                         }
 161
 162                         if (isset($entry->gender)) {
 163                                 $gender = $entry->gender;
 164                         }
 165
 166                         if (isset($entry->generation) && ($entry->generation > 0)) {
 167                                 $generation = ++$entry->generation;
 168                         }
 169
 170                         if (isset($entry->tags)) {
 171                                 foreach ($entry->tags as $tag) {
 172                                         $keywords = implode(", ", $tag);
 173                                 }
 174                         }
 175
 176                         if (isset($entry->contactType) && ($entry->contactType >= 0)) {
 177                                 $contact_type = $entry->contactType;
 178                         }
 179
 180                         $gcontact = ["url" => $profile_url,
 181                                         "name" => $name,
 182                                         "network" => $network,
 183                                         "photo" => $profile_photo,
 184                                         "about" => $about,
 185                                         "location" => $location,
 186                                         "gender" => $gender,
 187                                         "keywords" => $keywords,
 188                                         "connect" => $connect_url,
 189                                         "updated" => $updated,
 190                                         "contact-type" => $contact_type,
 191                                         "generation" => $generation];
 192
 193                         try {
 194                                 $gcontact = GContact::sanitize($gcontact);
 195                                 $gcid = GContact::update($gcontact);
 196
 197                                 GContact::link($gcid, $uid, $cid, $zcid);
 198                         } catch (Exception $e) {
 199                                 logger($e->getMessage(), LOGGER_DEBUG);
 200                         }
 201                 }
 202                 logger("load: loaded $total entries", LOGGER_DEBUG);
 203
 204                 $condition = ["`cid` = ? AND `uid` = ? AND `zcid` = ? AND `updated` < UTC_TIMESTAMP - INTERVAL 2 DAY", $cid, $uid, $zcid];
 205                 dba::delete('glink', $condition);
 206         }
 207
 208         public static function reachable($profile, $server = "", $network = "", $force = false)
 209         {
 210                 if ($server == "") {
 211                         $server = self::detectServer($profile);
 212                 }
 213
 214                 if ($server == "") {
 215                         return true;
 216                 }
 217
 218                 return self::checkServer($server, $network, $force);
 219         }
 220
 221         public static function detectServer($profile)
 222         {
 223                 // Try to detect the server path based upon some known standard paths
 224                 $server_url = "";
 225
 226                 if ($server_url == "") {
 227                         $friendica = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $profile);
 228                         if ($friendica != $profile) {
 229                                 $server_url = $friendica;
 230                                 $network = NETWORK_DFRN;
 231                         }
 232                 }
 233
 234                 if ($server_url == "") {
 235                         $diaspora = preg_replace("=(https?://)(.*)/u/(.*)=ism", "$1$2", $profile);
 236                         if ($diaspora != $profile) {
 237                                 $server_url = $diaspora;
 238                                 $network = NETWORK_DIASPORA;
 239                         }
 240                 }
 241
 242                 if ($server_url == "") {
 243                         $red = preg_replace("=(https?://)(.*)/channel/(.*)=ism", "$1$2", $profile);
 244                         if ($red != $profile) {
 245                                 $server_url = $red;
 246                                 $network = NETWORK_DIASPORA;
 247                         }
 248                 }
 249
 250                 // Mastodon
 251                 if ($server_url == "") {
 252                         $mastodon = preg_replace("=(https?://)(.*)/users/(.*)=ism", "$1$2", $profile);
 253                         if ($mastodon != $profile) {
 254                                 $server_url = $mastodon;
 255                                 $network = NETWORK_OSTATUS;
 256                         }
 257                 }
 258
 259                 // Numeric OStatus variant
 260                 if ($server_url == "") {
 261                         $ostatus = preg_replace("=(https?://)(.*)/user/(.*)=ism", "$1$2", $profile);
 262                         if ($ostatus != $profile) {
 263                                 $server_url = $ostatus;
 264                                 $network = NETWORK_OSTATUS;
 265                         }
 266                 }
 267
 268                 // Wild guess
 269                 if ($server_url == "") {
 270                         $base = preg_replace("=(https?://)(.*?)/(.*)=ism", "$1$2", $profile);
 271                         if ($base != $profile) {
 272                                 $server_url = $base;
 273                                 $network = NETWORK_PHANTOM;
 274                         }
 275                 }
 276
 277                 if ($server_url == "") {
 278                         return "";
 279                 }
 280
 281                 $r = q(
 282                         "SELECT `id` FROM `gserver` WHERE `nurl` = '%s' AND `last_contact` > `last_failure`",
 283                         dbesc(normalise_link($server_url))
 284                 );
 285
 286                 if (DBM::is_result($r)) {
 287                         return $server_url;
 288                 }
 289
 290                 // Fetch the host-meta to check if this really is a server
 291                 $serverret = z_fetch_url($server_url."/.well-known/host-meta");
 292                 if (!$serverret["success"]) {
 293                         return "";
 294                 }
 295
 296                 return $server_url;
 297         }
 298
 299         public static function alternateOStatusUrl($url)
 300         {
 301                 return(preg_match("=https?://.+/user/\d+=ism", $url, $matches));
 302         }
 303
 304         public static function lastUpdated($profile, $force = false)
 305         {
 306                 $gcontacts = q(
 307                         "SELECT * FROM `gcontact` WHERE `nurl` = '%s'",
 308                         dbesc(normalise_link($profile))
 309                 );
 310
 311                 if (!DBM::is_result($gcontacts)) {
 312                         return false;
 313                 }
 314
 315                 $contact = ["url" => $profile];
 316
 317                 if ($gcontacts[0]["created"] <= NULL_DATE) {
 318                         $contact['created'] = datetime_convert();
 319                 }
 320
 321                 if ($force) {
 322                         $server_url = normalise_link(self::detectServer($profile));
 323                 }
 324
 325                 if (($server_url == '') && ($gcontacts[0]["server_url"] != "")) {
 326                         $server_url = $gcontacts[0]["server_url"];
 327                 }
 328
 329                 if (!$force && (($server_url == '') || ($gcontacts[0]["server_url"] == $gcontacts[0]["nurl"]))) {
 330                         $server_url = normalise_link(self::detectServer($profile));
 331                 }
 332
 333                 if (!in_array($gcontacts[0]["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_FEED, NETWORK_OSTATUS, ""])) {
 334                         logger("Profile ".$profile.": Network type ".$gcontacts[0]["network"]." can't be checked", LOGGER_DEBUG);
 335                         return false;
 336                 }
 337
 338                 if ($server_url != "") {
 339                         if (!self::checkServer($server_url, $gcontacts[0]["network"], $force)) {
 340                                 if ($force) {
 341                                         $fields = ['last_failure' => datetime_convert()];
 342                                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 343                                 }
 344
 345                                 logger("Profile ".$profile.": Server ".$server_url." wasn't reachable.", LOGGER_DEBUG);
 346                                 return false;
 347                         }
 348                         $contact['server_url'] = $server_url;
 349                 }
 350
 351                 if (in_array($gcontacts[0]["network"], ["", NETWORK_FEED])) {
 352                         $server = q(
 353                                 "SELECT `network` FROM `gserver` WHERE `nurl` = '%s' AND `network` != ''",
 354                                 dbesc(normalise_link($server_url))
 355                         );
 356
 357                         if ($server) {
 358                                 $contact['network'] = $server[0]["network"];
 359                         } else {
 360                                 return false;
 361                         }
 362                 }
 363
 364                 // noscrape is really fast so we don't cache the call.
 365                 if (($server_url != "") && ($gcontacts[0]["nick"] != "")) {
 366                         //  Use noscrape if possible
 367                         $server = q("SELECT `noscrape`, `network` FROM `gserver` WHERE `nurl` = '%s' AND `noscrape` != ''", dbesc(normalise_link($server_url)));
 368
 369                         if ($server) {
 370                                 $noscraperet = z_fetch_url($server[0]["noscrape"]."/".$gcontacts[0]["nick"]);
 371
 372                                 if ($noscraperet["success"] && ($noscraperet["body"] != "")) {
 373                                         $noscrape = json_decode($noscraperet["body"], true);
 374
 375                                         if (is_array($noscrape)) {
 376                                                 $contact["network"] = $server[0]["network"];
 377
 378                                                 if (isset($noscrape["fn"])) {
 379                                                         $contact["name"] = $noscrape["fn"];
 380                                                 }
 381                                                 if (isset($noscrape["comm"])) {
 382                                                         $contact["community"] = $noscrape["comm"];
 383                                                 }
 384                                                 if (isset($noscrape["tags"])) {
 385                                                         $keywords = implode(" ", $noscrape["tags"]);
 386                                                         if ($keywords != "") {
 387                                                                 $contact["keywords"] = $keywords;
 388                                                         }
 389                                                 }
 390
 391                                                 $location = Profile::formatLocation($noscrape);
 392                                                 if ($location) {
 393                                                         $contact["location"] = $location;
 394                                                 }
 395                                                 if (isset($noscrape["dfrn-notify"])) {
 396                                                         $contact["notify"] = $noscrape["dfrn-notify"];
 397                                                 }
 398                                                 // Remove all fields that are not present in the gcontact table
 399                                                 unset($noscrape["fn"]);
 400                                                 unset($noscrape["key"]);
 401                                                 unset($noscrape["homepage"]);
 402                                                 unset($noscrape["comm"]);
 403                                                 unset($noscrape["tags"]);
 404                                                 unset($noscrape["locality"]);
 405                                                 unset($noscrape["region"]);
 406                                                 unset($noscrape["country-name"]);
 407                                                 unset($noscrape["contacts"]);
 408                                                 unset($noscrape["dfrn-request"]);
 409                                                 unset($noscrape["dfrn-confirm"]);
 410                                                 unset($noscrape["dfrn-notify"]);
 411                                                 unset($noscrape["dfrn-poll"]);
 412
 413                                                 // Set the date of the last contact
 414                                                 /// @todo By now the function "update_gcontact" doesn't work with this field
 415                                                 //$contact["last_contact"] = datetime_convert();
 416
 417                                                 $contact = array_merge($contact, $noscrape);
 418
 419                                                 GContact::update($contact);
 420
 421                                                 if (trim($noscrape["updated"]) != "") {
 422                                                         $fields = ['last_contact' => datetime_convert()];
 423                                                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 424
 425                                                         logger("Profile ".$profile." was last updated at ".$noscrape["updated"]." (noscrape)", LOGGER_DEBUG);
 426
 427                                                         return $noscrape["updated"];
 428                                                 }
 429                                         }
 430                                 }
 431                         }
 432                 }
 433
 434                 // If we only can poll the feed, then we only do this once a while
 435                 if (!$force && !self::updateNeeded($gcontacts[0]["created"], $gcontacts[0]["updated"], $gcontacts[0]["last_failure"], $gcontacts[0]["last_contact"])) {
 436                         logger("Profile ".$profile." was last updated at ".$gcontacts[0]["updated"]." (cached)", LOGGER_DEBUG);
 437
 438                         GContact::update($contact);
 439                         return $gcontacts[0]["updated"];
 440                 }
 441
 442                 $data = Probe::uri($profile);
 443
 444                 // Is the profile link the alternate OStatus link notation? (http://domain.tld/user/4711)
 445                 // Then check the other link and delete this one
 446                 if (($data["network"] == NETWORK_OSTATUS) && self::alternateOStatusUrl($profile)
 447                         && (normalise_link($profile) == normalise_link($data["alias"]))
 448                         && (normalise_link($profile) != normalise_link($data["url"]))
 449                 ) {
 450                         // Delete the old entry
 451                         dba::delete('gcontact', ['nurl' => normalise_link($profile)]);
 452
 453                         $gcontact = array_merge($gcontacts[0], $data);
 454
 455                         $gcontact["server_url"] = $data["baseurl"];
 456
 457                         try {
 458                                 $gcontact = GContact::sanitize($gcontact);
 459                                 GContact::update($gcontact);
 460
 461                                 self::lastUpdated($data["url"], $force);
 462                         } catch (Exception $e) {
 463                                 logger($e->getMessage(), LOGGER_DEBUG);
 464                         }
 465
 466                         logger("Profile ".$profile." was deleted", LOGGER_DEBUG);
 467                         return false;
 468                 }
 469
 470                 if (($data["poll"] == "") || (in_array($data["network"], [NETWORK_FEED, NETWORK_PHANTOM]))) {
 471                         $fields = ['last_failure' => datetime_convert()];
 472                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 473
 474                         logger("Profile ".$profile." wasn't reachable (profile)", LOGGER_DEBUG);
 475                         return false;
 476                 }
 477
 478                 $contact = array_merge($contact, $data);
 479
 480                 $contact["server_url"] = $data["baseurl"];
 481
 482                 GContact::update($contact);
 483
 484                 $feedret = z_fetch_url($data["poll"]);
 485
 486                 if (!$feedret["success"]) {
 487                         $fields = ['last_failure' => datetime_convert()];
 488                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 489
 490                         logger("Profile ".$profile." wasn't reachable (no feed)", LOGGER_DEBUG);
 491                         return false;
 492                 }
 493
 494                 $doc = new DOMDocument();
 495                 @$doc->loadXML($feedret["body"]);
 496
 497                 $xpath = new DOMXPath($doc);
 498                 $xpath->registerNamespace('atom', "http://www.w3.org/2005/Atom");
 499
 500                 $entries = $xpath->query('/atom:feed/atom:entry');
 501
 502                 $last_updated = "";
 503
 504                 foreach ($entries as $entry) {
 505                         $published = $xpath->query('atom:published/text()', $entry)->item(0)->nodeValue;
 506                         $updated = $xpath->query('atom:updated/text()', $entry)->item(0)->nodeValue;
 507
 508                         if ($last_updated < $published)
 509                                 $last_updated = $published;
 510
 511                         if ($last_updated < $updated)
 512                                 $last_updated = $updated;
 513                 }
 514
 515                 // Maybe there aren't any entries. Then check if it is a valid feed
 516                 if ($last_updated == "") {
 517                         if ($xpath->query('/atom:feed')->length > 0) {
 518                                 $last_updated = NULL_DATE;
 519                         }
 520                 }
 521                 $fields = ['updated' => DBM::date($last_updated), 'last_contact' => DBM::date()];
 522                 dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 523
 524                 if (($gcontacts[0]["generation"] == 0)) {
 525                         $fields = ['generation' => 9];
 526                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 527                 }
 528
 529                 logger("Profile ".$profile." was last updated at ".$last_updated, LOGGER_DEBUG);
 530
 531                 return($last_updated);
 532         }
 533
 534         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 535         {
 536                 $now = strtotime(datetime_convert());
 537
 538                 if ($updated > $last_contact) {
 539                         $contact_time = strtotime($updated);
 540                 } else {
 541                         $contact_time = strtotime($last_contact);
 542                 }
 543
 544                 $failure_time = strtotime($last_failure);
 545                 $created_time = strtotime($created);
 546
 547                 // If there is no "created" time then use the current time
 548                 if ($created_time <= 0) {
 549                         $created_time = $now;
 550                 }
 551
 552                 // If the last contact was less than 24 hours then don't update
 553                 if (($now - $contact_time) < (60 * 60 * 24)) {
 554                         return false;
 555                 }
 556
 557                 // If the last failure was less than 24 hours then don't update
 558                 if (($now - $failure_time) < (60 * 60 * 24)) {
 559                         return false;
 560                 }
 561
 562                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 563                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 564                 //      return false;
 565
 566                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 567                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 568                         return false;
 569                 }
 570
 571                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 572                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 573                         return false;
 574                 }
 575
 576                 return true;
 577         }
 578
 579         private static function toBoolean($val)
 580         {
 581                 if (($val == "true") || ($val == 1)) {
 582                         return true;
 583                 } elseif (($val == "false") || ($val == 0)) {
 584                         return false;
 585                 }
 586
 587                 return $val;
 588         }
 589
 590         /**
 591          * @brief Detect server type (Hubzilla or Friendica) via the poco data
 592          *
 593          * @param object $data POCO data
 594          * @return array Server data
 595          */
 596         private static function detectPocoData($data)
 597         {
 598                 $server = false;
 599
 600                 if (!isset($data->entry)) {
 601                         return false;
 602                 }
 603
 604                 if (count($data->entry) == 0) {
 605                         return false;
 606                 }
 607
 608                 if (!isset($data->entry[0]->urls)) {
 609                         return false;
 610                 }
 611
 612                 if (count($data->entry[0]->urls) == 0) {
 613                         return false;
 614                 }
 615
 616                 foreach ($data->entry[0]->urls as $url) {
 617                         if ($url->type == 'zot') {
 618                                 $server = [];
 619                                 $server["platform"] = 'Hubzilla';
 620                                 $server["network"] = NETWORK_DIASPORA;
 621                                 return $server;
 622                         }
 623                 }
 624                 return false;
 625         }
 626
 627         /**
 628          * @brief Detect server type by using the nodeinfo data
 629          *
 630          * @param string $server_url address of the server
 631          * @return array Server data
 632          */
 633         private static function fetchNodeinfo($server_url)
 634         {
 635                 $serverret = z_fetch_url($server_url."/.well-known/nodeinfo");
 636                 if (!$serverret["success"]) {
 637                         return false;
 638                 }
 639
 640                 $nodeinfo = json_decode($serverret['body']);
 641
 642                 if (!is_object($nodeinfo)) {
 643                         return false;
 644                 }
 645
 646                 if (!is_array($nodeinfo->links)) {
 647                         return false;
 648                 }
 649
 650                 $nodeinfo_url = '';
 651
 652                 foreach ($nodeinfo->links as $link) {
 653                         if ($link->rel == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 654                                 $nodeinfo_url = $link->href;
 655                         }
 656                 }
 657
 658                 if ($nodeinfo_url == '') {
 659                         return false;
 660                 }
 661
 662                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 663                 if (parse_url($server_url, PHP_URL_HOST) != parse_url($nodeinfo_url, PHP_URL_HOST)) {
 664                         return false;
 665                 }
 666
 667                 $serverret = z_fetch_url($nodeinfo_url);
 668                 if (!$serverret["success"]) {
 669                         return false;
 670                 }
 671
 672                 $nodeinfo = json_decode($serverret['body']);
 673
 674                 if (!is_object($nodeinfo)) {
 675                         return false;
 676                 }
 677
 678                 $server = [];
 679
 680                 $server['register_policy'] = REGISTER_CLOSED;
 681
 682                 if (is_bool($nodeinfo->openRegistrations) && $nodeinfo->openRegistrations) {
 683                         $server['register_policy'] = REGISTER_OPEN;
 684                 }
 685
 686                 if (is_object($nodeinfo->software)) {
 687                         if (isset($nodeinfo->software->name)) {
 688                                 $server['platform'] = $nodeinfo->software->name;
 689                         }
 690
 691                         if (isset($nodeinfo->software->version)) {
 692                                 $server['version'] = $nodeinfo->software->version;
 693                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 694                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 695                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 696                         }
 697                 }
 698
 699                 if (is_object($nodeinfo->metadata)) {
 700                         if (isset($nodeinfo->metadata->nodeName)) {
 701                                 $server['site_name'] = $nodeinfo->metadata->nodeName;
 702                         }
 703                 }
 704
 705                 if (!empty($nodeinfo->usage->users->total)) {
 706                         $server['registered-users'] = $nodeinfo->usage->users->total;
 707                 }
 708
 709                 $diaspora = false;
 710                 $friendica = false;
 711                 $gnusocial = false;
 712
 713                 if (is_array($nodeinfo->protocols->inbound)) {
 714                         foreach ($nodeinfo->protocols->inbound as $inbound) {
 715                                 if ($inbound == 'diaspora') {
 716                                         $diaspora = true;
 717                                 }
 718                                 if ($inbound == 'friendica') {
 719                                         $friendica = true;
 720                                 }
 721                                 if ($inbound == 'gnusocial') {
 722                                         $gnusocial = true;
 723                                 }
 724                         }
 725                 }
 726
 727                 if ($gnusocial) {
 728                         $server['network'] = NETWORK_OSTATUS;
 729                 }
 730                 if ($diaspora) {
 731                         $server['network'] = NETWORK_DIASPORA;
 732                 }
 733                 if ($friendica) {
 734                         $server['network'] = NETWORK_DFRN;
 735                 }
 736
 737                 if (!$server) {
 738                         return false;
 739                 }
 740
 741                 return $server;
 742         }
 743
 744         /**
 745          * @brief Detect server type (Hubzilla or Friendica) via the front page body
 746          *
 747          * @param string $body Front page of the server
 748          * @return array Server data
 749          */
 750         private static function detectServerType($body)
 751         {
 752                 $server = false;
 753
 754                 $doc = new DOMDocument();
 755                 @$doc->loadHTML($body);
 756                 $xpath = new DOMXPath($doc);
 757
 758                 $list = $xpath->query("//meta[@name]");
 759
 760                 foreach ($list as $node) {
 761                         $attr = [];
 762                         if ($node->attributes->length) {
 763                                 foreach ($node->attributes as $attribute) {
 764                                         $attr[$attribute->name] = $attribute->value;
 765                                 }
 766                         }
 767                         if ($attr['name'] == 'generator') {
 768                                 $version_part = explode(" ", $attr['content']);
 769                                 if (count($version_part) == 2) {
 770                                         if (in_array($version_part[0], ["Friendika", "Friendica"])) {
 771                                                 $server = [];
 772                                                 $server["platform"] = $version_part[0];
 773                                                 $server["version"] = $version_part[1];
 774                                                 $server["network"] = NETWORK_DFRN;
 775                                         }
 776                                 }
 777                         }
 778                 }
 779
 780                 if (!$server) {
 781                         $list = $xpath->query("//meta[@property]");
 782
 783                         foreach ($list as $node) {
 784                                 $attr = [];
 785                                 if ($node->attributes->length) {
 786                                         foreach ($node->attributes as $attribute) {
 787                                                 $attr[$attribute->name] = $attribute->value;
 788                                         }
 789                                 }
 790                                 if ($attr['property'] == 'generator' && in_array($attr['content'], ["hubzilla", "BlaBlaNet"])) {
 791                                         $server = [];
 792                                         $server["platform"] = $attr['content'];
 793                                         $server["version"] = "";
 794                                         $server["network"] = NETWORK_DIASPORA;
 795                                 }
 796                         }
 797                 }
 798
 799                 if (!$server) {
 800                         return false;
 801                 }
 802
 803                 $server["site_name"] = $xpath->evaluate("//head/title/text()")->item(0)->nodeValue;
 804                 return $server;
 805         }
 806
 807         public static function checkServer($server_url, $network = "", $force = false)
 808         {
 809                 // Unify the server address
 810                 $server_url = trim($server_url, "/");
 811                 $server_url = str_replace("/index.php", "", $server_url);
 812
 813                 if ($server_url == "") {
 814                         return false;
 815                 }
 816
 817                 $gserver = dba::selectFirst('gserver', [], ['nurl' => normalise_link($server_url)]);
 818                 if (DBM::is_result($gserver)) {
 819                         if ($gserver["created"] <= NULL_DATE) {
 820                                 $fields = ['created' => datetime_convert()];
 821                                 $condition = ['nurl' => normalise_link($server_url)];
 822                                 dba::update('gserver', $fields, $condition);
 823                         }
 824                         $poco = $gserver["poco"];
 825                         $noscrape = $gserver["noscrape"];
 826
 827                         if ($network == "") {
 828                                 $network = $gserver["network"];
 829                         }
 830
 831                         $last_contact = $gserver["last_contact"];
 832                         $last_failure = $gserver["last_failure"];
 833                         $version = $gserver["version"];
 834                         $platform = $gserver["platform"];
 835                         $site_name = $gserver["site_name"];
 836                         $info = $gserver["info"];
 837                         $register_policy = $gserver["register_policy"];
 838                         $registered_users = $gserver["registered-users"];
 839
 840                         if (!$force && !self::updateNeeded($gserver["created"], "", $last_failure, $last_contact)) {
 841                                 logger("Use cached data for server ".$server_url, LOGGER_DEBUG);
 842                                 return ($last_contact >= $last_failure);
 843                         }
 844                 } else {
 845                         $poco = "";
 846                         $noscrape = "";
 847                         $version = "";
 848                         $platform = "";
 849                         $site_name = "";
 850                         $info = "";
 851                         $register_policy = -1;
 852                         $registered_users = 0;
 853
 854                         $last_contact = NULL_DATE;
 855                         $last_failure = NULL_DATE;
 856                 }
 857                 logger("Server ".$server_url." is outdated or unknown. Start discovery. Force: ".$force." Created: ".$gserver["created"]." Failure: ".$last_failure." Contact: ".$last_contact, LOGGER_DEBUG);
 858
 859                 $failure = false;
 860                 $possible_failure = false;
 861                 $orig_last_failure = $last_failure;
 862                 $orig_last_contact = $last_contact;
 863
 864                 // Mastodon uses the "@" for user profiles.
 865                 // But this can be misunderstood.
 866                 if (parse_url($server_url, PHP_URL_USER) != '') {
 867                         dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
 868                         return false;
 869                 }
 870
 871                 // Check if the page is accessible via SSL.
 872                 $orig_server_url = $server_url;
 873                 $server_url = str_replace("http://", "https://", $server_url);
 874
 875                 // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
 876                 $serverret = z_fetch_url($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
 877
 878                 // Quit if there is a timeout.
 879                 // But we want to make sure to only quit if we are mostly sure that this server url fits.
 880                 if (DBM::is_result($gserver) && ($orig_server_url == $server_url) &&
 881                         ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT)) {
 882                         logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
 883                         dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
 884                         return false;
 885                 }
 886
 887                 // Maybe the page is unencrypted only?
 888                 $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
 889                 if (!$serverret["success"] || ($serverret["body"] == "") || (@sizeof($xmlobj) == 0) || !is_object($xmlobj)) {
 890                         $server_url = str_replace("https://", "http://", $server_url);
 891
 892                         // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
 893                         $serverret = z_fetch_url($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
 894
 895                         // Quit if there is a timeout
 896                         if ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 897                                 logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
 898                                 dba::update('gserver', ['last_failure' => datetime_convert()], ['nurl' => normalise_link($server_url)]);
 899                                 return false;
 900                         }
 901
 902                         $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
 903                 }
 904
 905                 if (!$serverret["success"] || ($serverret["body"] == "") || (sizeof($xmlobj) == 0) || !is_object($xmlobj)) {
 906                         // Workaround for bad configured servers (known nginx problem)
 907                         if (!in_array($serverret["debug"]["http_code"], ["403", "404"])) {
 908                                 $failure = true;
 909                         }
 910                         $possible_failure = true;
 911                 }
 912
 913                 // If the server has no possible failure we reset the cached data
 914                 if (!$possible_failure) {
 915                         $version = "";
 916                         $platform = "";
 917                         $site_name = "";
 918                         $info = "";
 919                         $register_policy = -1;
 920                 }
 921
 922                 if (!$failure) {
 923                         // This will be too low, but better than no value at all.
 924                         $registered_users = dba::count('gcontact', ['server_url' => normalise_link($server_url)]);
 925                 }
 926
 927                 // Look for poco
 928                 if (!$failure) {
 929                         $serverret = z_fetch_url($server_url."/poco");
 930                         if ($serverret["success"]) {
 931                                 $data = json_decode($serverret["body"]);
 932                                 if (isset($data->totalResults)) {
 933                                         $registered_users = $data->totalResults;
 934                                         $poco = $server_url."/poco";
 935                                         $server = self::detectPocoData($data);
 936                                         if ($server) {
 937                                                 $platform = $server['platform'];
 938                                                 $network = $server['network'];
 939                                                 $version = '';
 940                                                 $site_name = '';
 941                                         }
 942                                 }
 943                                 // There are servers out there who don't return 404 on a failure
 944                                 // We have to be sure that don't misunderstand this
 945                                 if (is_null($data)) {
 946                                         $poco = "";
 947                                         $noscrape = "";
 948                                         $network = "";
 949                                 }
 950                         }
 951                 }
 952
 953                 if (!$failure) {
 954                         // Test for Diaspora, Hubzilla, Mastodon or older Friendica servers
 955                         $serverret = z_fetch_url($server_url);
 956
 957                         if (!$serverret["success"] || ($serverret["body"] == "")) {
 958                                 $failure = true;
 959                         } else {
 960                                 $server = self::detectServerType($serverret["body"]);
 961                                 if ($server) {
 962                                         $platform = $server['platform'];
 963                                         $network = $server['network'];
 964                                         $version = $server['version'];
 965                                         $site_name = $server['site_name'];
 966                                 }
 967
 968                                 $lines = explode("\n", $serverret["header"]);
 969                                 if (count($lines)) {
 970                                         foreach ($lines as $line) {
 971                                                 $line = trim($line);
 972                                                 if (stristr($line, 'X-Diaspora-Version:')) {
 973                                                         $platform = "Diaspora";
 974                                                         $version = trim(str_replace("X-Diaspora-Version:", "", $line));
 975                                                         $version = trim(str_replace("x-diaspora-version:", "", $version));
 976                                                         $network = NETWORK_DIASPORA;
 977                                                         $versionparts = explode("-", $version);
 978                                                         $version = $versionparts[0];
 979                                                 }
 980
 981                                                 if (stristr($line, 'Server: Mastodon')) {
 982                                                         $platform = "Mastodon";
 983                                                         $network = NETWORK_OSTATUS;
 984                                                 }
 985                                         }
 986                                 }
 987                         }
 988                 }
 989
 990                 if (!$failure && ($poco == "")) {
 991                         // Test for Statusnet
 992                         // Will also return data for Friendica and GNU Social - but it will be overwritten later
 993                         // The "not implemented" is a special treatment for really, really old Friendica versions
 994                         $serverret = z_fetch_url($server_url."/api/statusnet/version.json");
 995                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
 996                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
 997                                 $platform = "StatusNet";
 998                                 // Remove junk that some GNU Social servers return
 999                                 $version = str_replace(chr(239).chr(187).chr(191), "", $serverret["body"]);
1000                                 $version = trim($version, '"');
1001                                 $network = NETWORK_OSTATUS;
1002                         }
1003
1004                         // Test for GNU Social
1005                         $serverret = z_fetch_url($server_url."/api/gnusocial/version.json");
1006                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
1007                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
1008                                 $platform = "GNU Social";
1009                                 // Remove junk that some GNU Social servers return
1010                                 $version = str_replace(chr(239).chr(187).chr(191), "", $serverret["body"]);
1011                                 $version = trim($version, '"');
1012                                 $network = NETWORK_OSTATUS;
1013                         }
1014
1015                         // Test for Mastodon
1016                         $orig_version = $version;
1017                         $serverret = z_fetch_url($server_url."/api/v1/instance");
1018                         if ($serverret["success"] && ($serverret["body"] != '')) {
1019                                 $data = json_decode($serverret["body"]);
1020
1021                                 if (isset($data->version)) {
1022                                         $platform = "Mastodon";
1023                                         $version = $data->version;
1024                                         $site_name = $data->title;
1025                                         $info = $data->description;
1026                                         $network = NETWORK_OSTATUS;
1027                                 }
1028                                 if (!empty($data->stats->user_count)) {
1029                                         $registered_users = $data->stats->user_count;
1030                                 }
1031                         }
1032                         if (strstr($orig_version.$version, 'Pleroma')) {
1033                                 $platform = 'Pleroma';
1034                                 $version = trim(str_replace('Pleroma', '', $version));
1035                         }
1036                 }
1037
1038                 if (!$failure) {
1039                         // Test for Hubzilla and Red
1040                         $serverret = z_fetch_url($server_url."/siteinfo.json");
1041                         if ($serverret["success"]) {
1042                                 $data = json_decode($serverret["body"]);
1043                                 if (isset($data->url)) {
1044                                         $platform = $data->platform;
1045                                         $version = $data->version;
1046                                         $network = NETWORK_DIASPORA;
1047                                 }
1048                                 if (!empty($data->site_name)) {
1049                                         $site_name = $data->site_name;
1050                                 }
1051                                 if (!empty($data->channels_total)) {
1052                                         $registered_users = $data->channels_total;
1053                                 }
1054                                 switch ($data->register_policy) {
1055                                         case "REGISTER_OPEN":
1056                                                 $register_policy = REGISTER_OPEN;
1057                                                 break;
1058                                         case "REGISTER_APPROVE":
1059                                                 $register_policy = REGISTER_APPROVE;
1060                                                 break;
1061                                         case "REGISTER_CLOSED":
1062                                         default:
1063                                                 $register_policy = REGISTER_CLOSED;
1064                                                 break;
1065                                 }
1066                         } else {
1067                                 // Test for Hubzilla, Redmatrix or Friendica
1068                                 $serverret = z_fetch_url($server_url."/api/statusnet/config.json");
1069                                 if ($serverret["success"]) {
1070                                         $data = json_decode($serverret["body"]);
1071                                         if (isset($data->site->server)) {
1072                                                 if (isset($data->site->platform)) {
1073                                                         $platform = $data->site->platform->PLATFORM_NAME;
1074                                                         $version = $data->site->platform->STD_VERSION;
1075                                                         $network = NETWORK_DIASPORA;
1076                                                 }
1077                                                 if (isset($data->site->BlaBlaNet)) {
1078                                                         $platform = $data->site->BlaBlaNet->PLATFORM_NAME;
1079                                                         $version = $data->site->BlaBlaNet->STD_VERSION;
1080                                                         $network = NETWORK_DIASPORA;
1081                                                 }
1082                                                 if (isset($data->site->hubzilla)) {
1083                                                         $platform = $data->site->hubzilla->PLATFORM_NAME;
1084                                                         $version = $data->site->hubzilla->RED_VERSION;
1085                                                         $network = NETWORK_DIASPORA;
1086                                                 }
1087                                                 if (isset($data->site->redmatrix)) {
1088                                                         if (isset($data->site->redmatrix->PLATFORM_NAME)) {
1089                                                                 $platform = $data->site->redmatrix->PLATFORM_NAME;
1090                                                         } elseif (isset($data->site->redmatrix->RED_PLATFORM)) {
1091                                                                 $platform = $data->site->redmatrix->RED_PLATFORM;
1092                                                         }
1093
1094                                                         $version = $data->site->redmatrix->RED_VERSION;
1095                                                         $network = NETWORK_DIASPORA;
1096                                                 }
1097                                                 if (isset($data->site->friendica)) {
1098                                                         $platform = $data->site->friendica->FRIENDICA_PLATFORM;
1099                                                         $version = $data->site->friendica->FRIENDICA_VERSION;
1100                                                         $network = NETWORK_DFRN;
1101                                                 }
1102
1103                                                 $site_name = $data->site->name;
1104
1105                                                 $data->site->closed = self::toBoolean($data->site->closed);
1106                                                 $data->site->private = self::toBoolean($data->site->private);
1107                                                 $data->site->inviteonly = self::toBoolean($data->site->inviteonly);
1108
1109                                                 if (!$data->site->closed && !$data->site->private and $data->site->inviteonly) {
1110                                                         $register_policy = REGISTER_APPROVE;
1111                                                 } elseif (!$data->site->closed && !$data->site->private) {
1112                                                         $register_policy = REGISTER_OPEN;
1113                                                 } else {
1114                                                         $register_policy = REGISTER_CLOSED;
1115                                                 }
1116                                         }
1117                                 }
1118                         }
1119                 }
1120
1121                 // Query statistics.json. Optional package for Diaspora, Friendica and Redmatrix
1122                 if (!$failure) {
1123                         $serverret = z_fetch_url($server_url."/statistics.json");
1124                         if ($serverret["success"]) {
1125                                 $data = json_decode($serverret["body"]);
1126
1127                                 if (isset($data->version)) {
1128                                         $version = $data->version;
1129                                         // Version numbers on statistics.json are presented with additional info, e.g.:
1130                                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
1131                                         $version = preg_replace("=(.+)-(.{4,})=ism", "$1", $version);
1132                                 }
1133
1134                                 if (!empty($data->name)) {
1135                                         $site_name = $data->name;
1136                                 }
1137
1138                                 if (!empty($data->network)) {
1139                                         $platform = $data->network;
1140                                 }
1141
1142                                 if ($platform == "Diaspora") {
1143                                         $network = NETWORK_DIASPORA;
1144                                 }
1145
1146                                 if ($data->registrations_open) {
1147                                         $register_policy = REGISTER_OPEN;
1148                                 } else {
1149                                         $register_policy = REGISTER_CLOSED;
1150                                 }
1151                         }
1152                 }
1153
1154                 // Query nodeinfo. Working for (at least) Diaspora and Friendica.
1155                 if (!$failure) {
1156                         $server = self::fetchNodeinfo($server_url);
1157                         if ($server) {
1158                                 $register_policy = $server['register_policy'];
1159
1160                                 if (isset($server['platform'])) {
1161                                         $platform = $server['platform'];
1162                                 }
1163
1164                                 if (isset($server['network'])) {
1165                                         $network = $server['network'];
1166                                 }
1167
1168                                 if (isset($server['version'])) {
1169                                         $version = $server['version'];
1170                                 }
1171
1172                                 if (isset($server['site_name'])) {
1173                                         $site_name = $server['site_name'];
1174                                 }
1175
1176                                 if (isset($server['registered-users'])) {
1177                                         $registered_users = $server['registered-users'];
1178                                 }
1179                         }
1180                 }
1181
1182                 // Check for noscrape
1183                 // Friendica servers could be detected as OStatus servers
1184                 if (!$failure && in_array($network, [NETWORK_DFRN, NETWORK_OSTATUS])) {
1185                         $serverret = z_fetch_url($server_url."/friendica/json");
1186
1187                         if (!$serverret["success"]) {
1188                                 $serverret = z_fetch_url($server_url."/friendika/json");
1189                         }
1190
1191                         if ($serverret["success"]) {
1192                                 $data = json_decode($serverret["body"]);
1193
1194                                 if (isset($data->version)) {
1195                                         $network = NETWORK_DFRN;
1196
1197                                         $noscrape = $data->no_scrape_url;
1198                                         $version = $data->version;
1199                                         $site_name = $data->site_name;
1200                                         $info = $data->info;
1201                                         $register_policy_str = $data->register_policy;
1202                                         $platform = $data->platform;
1203
1204                                         switch ($register_policy_str) {
1205                                                 case "REGISTER_CLOSED":
1206                                                         $register_policy = REGISTER_CLOSED;
1207                                                         break;
1208                                                 case "REGISTER_APPROVE":
1209                                                         $register_policy = REGISTER_APPROVE;
1210                                                         break;
1211                                                 case "REGISTER_OPEN":
1212                                                         $register_policy = REGISTER_OPEN;
1213                                                         break;
1214                                         }
1215                                 }
1216                         }
1217                 }
1218
1219                 // Every server has got at least an admin account
1220                 if (!$failure && ($registered_users == 0)) {
1221                         $registered_users = 1;
1222                 }
1223
1224                 if ($possible_failure && !$failure) {
1225                         $failure = true;
1226                 }
1227
1228                 if ($failure) {
1229                         $last_contact = $orig_last_contact;
1230                         $last_failure = datetime_convert();
1231                 } else {
1232                         $last_contact = datetime_convert();
1233                         $last_failure = $orig_last_failure;
1234                 }
1235
1236                 if (($last_contact <= $last_failure) && !$failure) {
1237                         logger("Server ".$server_url." seems to be alive, but last contact wasn't set - could be a bug", LOGGER_DEBUG);
1238                 } elseif (($last_contact >= $last_failure) && $failure) {
1239                         logger("Server ".$server_url." seems to be dead, but last failure wasn't set - could be a bug", LOGGER_DEBUG);
1240                 }
1241
1242                 // Check again if the server exists
1243                 $found = dba::exists('gserver', ['nurl' => normalise_link($server_url)]);
1244
1245                 $version = strip_tags($version);
1246                 $site_name = strip_tags($site_name);
1247                 $info = strip_tags($info);
1248                 $platform = strip_tags($platform);
1249
1250                 $fields = ['url' => $server_url, 'version' => $version,
1251                                 'site_name' => $site_name, 'info' => $info, 'register_policy' => $register_policy,
1252                                 'poco' => $poco, 'noscrape' => $noscrape, 'network' => $network,
1253                                 'platform' => $platform, 'registered-users' => $registered_users,
1254                                 'last_contact' => $last_contact, 'last_failure' => $last_failure];
1255
1256                 if ($found) {
1257                         dba::update('gserver', $fields, ['nurl' => normalise_link($server_url)]);
1258                 } elseif (!$failure) {
1259                         $fields['nurl'] = normalise_link($server_url);
1260                         $fields['created'] = datetime_convert();
1261                         dba::insert('gserver', $fields);
1262                 }
1263                 logger("End discovery for server " . $server_url, LOGGER_DEBUG);
1264
1265                 return !$failure;
1266         }
1267
1268         /**
1269          * @brief Returns a list of all known servers
1270          * @return array List of server urls
1271          */
1272         public static function serverlist()
1273         {
1274                 $r = q(
1275                         "SELECT `url`, `site_name` AS `displayName`, `network`, `platform`, `version` FROM `gserver`
1276                         WHERE `network` IN ('%s', '%s', '%s') AND `last_contact` > `last_failure`
1277                         ORDER BY `last_contact`
1278                         LIMIT 1000",
1279                         dbesc(NETWORK_DFRN),
1280                         dbesc(NETWORK_DIASPORA),
1281                         dbesc(NETWORK_OSTATUS)
1282                 );
1283
1284                 if (!DBM::is_result($r)) {
1285                         return false;
1286                 }
1287
1288                 return $r;
1289         }
1290
1291         /**
1292          * @brief Fetch server list from remote servers and adds them when they are new.
1293          *
1294          * @param string $poco URL to the POCO endpoint
1295          */
1296         private static function fetchServerlist($poco)
1297         {
1298                 $serverret = z_fetch_url($poco."/@server");
1299                 if (!$serverret["success"]) {
1300                         return;
1301                 }
1302                 $serverlist = json_decode($serverret['body']);
1303
1304                 if (!is_array($serverlist)) {
1305                         return;
1306                 }
1307
1308                 foreach ($serverlist as $server) {
1309                         $server_url = str_replace("/index.php", "", $server->url);
1310
1311                         $r = q("SELECT `nurl` FROM `gserver` WHERE `nurl` = '%s'", dbesc(normalise_link($server_url)));
1312                         if (!DBM::is_result($r)) {
1313                                 logger("Call server check for server ".$server_url, LOGGER_DEBUG);
1314                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $server_url);
1315                         }
1316                 }
1317         }
1318
1319         private static function discoverFederation()
1320         {
1321                 $last = Config::get('poco', 'last_federation_discovery');
1322
1323                 if ($last) {
1324                         $next = $last + (24 * 60 * 60);
1325                         if ($next > time()) {
1326                                 return;
1327                         }
1328                 }
1329
1330                 // Discover Friendica, Hubzilla and Diaspora servers
1331                 $serverdata = fetch_url("http://the-federation.info/pods.json");
1332
1333                 if ($serverdata) {
1334                         $servers = json_decode($serverdata);
1335
1336                         foreach ($servers->pods as $server) {
1337                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://".$server->host);
1338                         }
1339                 }
1340
1341                 // Disvover Mastodon servers
1342                 if (!Config::get('system', 'ostatus_disabled')) {
1343                         $accesstoken = Config::get('system', 'instances_social_key');
1344                         if (!empty($accesstoken)) {
1345                                 $api = 'https://instances.social/api/1.0/instances/list?count=0';
1346                                 $header = ['Authorization: Bearer '.$accesstoken];
1347                                 $serverdata = z_fetch_url($api, false, $redirects, ['headers' => $header]);
1348                                 if ($serverdata['success']) {
1349                                         $servers = json_decode($serverdata['body']);
1350                                         foreach ($servers->instances as $server) {
1351                                                 $url = (is_null($server->https_score) ? 'http' : 'https').'://'.$server->name;
1352                                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $url);
1353                                         }
1354                                 }
1355                         }
1356                 }
1357
1358                 // Currently disabled, since the service isn't available anymore.
1359                 // It is not removed since I hope that there will be a successor.
1360                 // Discover GNU Social Servers.
1361                 //if (!Config::get('system','ostatus_disabled')) {
1362                 //      $serverdata = "http://gstools.org/api/get_open_instances/";
1363
1364                 //      $result = z_fetch_url($serverdata);
1365                 //      if ($result["success"]) {
1366                 //              $servers = json_decode($result["body"]);
1367
1368                 //              foreach($servers->data as $server)
1369                 //                      self::checkServer($server->instance_address);
1370                 //      }
1371                 //}
1372
1373                 Config::set('poco', 'last_federation_discovery', time());
1374         }
1375
1376         public static function discoverSingleServer($id)
1377         {
1378                 $r = q("SELECT `poco`, `nurl`, `url`, `network` FROM `gserver` WHERE `id` = %d", intval($id));
1379                 if (!DBM::is_result($r)) {
1380                         return false;
1381                 }
1382
1383                 $server = $r[0];
1384
1385                 // Discover new servers out there (Works from Friendica version 3.5.2)
1386                 self::fetchServerlist($server["poco"]);
1387
1388                 // Fetch all users from the other server
1389                 $url = $server["poco"]."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1390
1391                 logger("Fetch all users from the server ".$server["url"], LOGGER_DEBUG);
1392
1393                 $retdata = z_fetch_url($url);
1394                 if ($retdata["success"]) {
1395                         $data = json_decode($retdata["body"]);
1396
1397                         self::discoverServer($data, 2);
1398
1399                         if (Config::get('system', 'poco_discovery') > 1) {
1400                                 $timeframe = Config::get('system', 'poco_discovery_since');
1401                                 if ($timeframe == 0) {
1402                                         $timeframe = 30;
1403                                 }
1404
1405                                 $updatedSince = date("Y-m-d H:i:s", time() - $timeframe * 86400);
1406
1407                                 // Fetch all global contacts from the other server (Not working with Redmatrix and Friendica versions before 3.3)
1408                                 $url = $server["poco"]."/@global?updatedSince=".$updatedSince."&fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1409
1410                                 $success = false;
1411
1412                                 $retdata = z_fetch_url($url);
1413                                 if ($retdata["success"]) {
1414                                         logger("Fetch all global contacts from the server ".$server["nurl"], LOGGER_DEBUG);
1415                                         $success = self::discoverServer(json_decode($retdata["body"]));
1416                                 }
1417
1418                                 if (!$success && (Config::get('system', 'poco_discovery') > 2)) {
1419                                         logger("Fetch contacts from users of the server ".$server["nurl"], LOGGER_DEBUG);
1420                                         self::discoverServerUsers($data, $server);
1421                                 }
1422                         }
1423
1424                         $fields = ['last_poco_query' => datetime_convert()];
1425                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1426
1427                         return true;
1428                 } else {
1429                         // If the server hadn't replied correctly, then force a sanity check
1430                         self::checkServer($server["url"], $server["network"], true);
1431
1432                         // If we couldn't reach the server, we will try it some time later
1433                         $fields = ['last_poco_query' => datetime_convert()];
1434                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1435
1436                         return false;
1437                 }
1438         }
1439
1440         public static function discover($complete = false)
1441         {
1442                 // Update the server list
1443                 self::discoverFederation();
1444
1445                 $no_of_queries = 5;
1446
1447                 $requery_days = intval(Config::get("system", "poco_requery_days"));
1448
1449                 if ($requery_days == 0) {
1450                         $requery_days = 7;
1451                 }
1452                 $last_update = date("c", time() - (60 * 60 * 24 * $requery_days));
1453
1454                 $r = q("SELECT `id`, `url`, `network` FROM `gserver` WHERE `last_contact` >= `last_failure` AND `poco` != '' AND `last_poco_query` < '%s' ORDER BY RAND()", dbesc($last_update));
1455                 if (DBM::is_result($r)) {
1456                         foreach ($r as $server) {
1457                                 if (!self::checkServer($server["url"], $server["network"])) {
1458                                         // The server is not reachable? Okay, then we will try it later
1459                                         $fields = ['last_poco_query' => datetime_convert()];
1460                                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1461                                         continue;
1462                                 }
1463
1464                                 logger('Update directory from server '.$server['url'].' with ID '.$server['id'], LOGGER_DEBUG);
1465                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "update_server_directory", (int)$server['id']);
1466
1467                                 if (!$complete && (--$no_of_queries == 0)) {
1468                                         break;
1469                                 }
1470                         }
1471                 }
1472         }
1473
1474         private static function discoverServerUsers($data, $server)
1475         {
1476                 if (!isset($data->entry)) {
1477                         return;
1478                 }
1479
1480                 foreach ($data->entry as $entry) {
1481                         $username = "";
1482                         if (isset($entry->urls)) {
1483                                 foreach ($entry->urls as $url) {
1484                                         if ($url->type == 'profile') {
1485                                                 $profile_url = $url->value;
1486                                                 $urlparts = parse_url($profile_url);
1487                                                 $username = end(explode("/", $urlparts["path"]));
1488                                         }
1489                                 }
1490                         }
1491                         if ($username != "") {
1492                                 logger("Fetch contacts for the user ".$username." from the server ".$server["nurl"], LOGGER_DEBUG);
1493
1494                                 // Fetch all contacts from a given user from the other server
1495                                 $url = $server["poco"]."/".$username."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1496
1497                                 $retdata = z_fetch_url($url);
1498                                 if ($retdata["success"]) {
1499                                         self::discoverServer(json_decode($retdata["body"]), 3);
1500                                 }
1501                         }
1502                 }
1503         }
1504
1505         private static function discoverServer($data, $default_generation = 0)
1506         {
1507                 if (!isset($data->entry) || !count($data->entry)) {
1508                         return false;
1509                 }
1510
1511                 $success = false;
1512
1513                 foreach ($data->entry as $entry) {
1514                         $profile_url = '';
1515                         $profile_photo = '';
1516                         $connect_url = '';
1517                         $name = '';
1518                         $network = '';
1519                         $updated = NULL_DATE;
1520                         $location = '';
1521                         $about = '';
1522                         $keywords = '';
1523                         $gender = '';
1524                         $contact_type = -1;
1525                         $generation = $default_generation;
1526
1527                         $name = $entry->displayName;
1528
1529                         if (isset($entry->urls)) {
1530                                 foreach ($entry->urls as $url) {
1531                                         if ($url->type == 'profile') {
1532                                                 $profile_url = $url->value;
1533                                                 continue;
1534                                         }
1535                                         if ($url->type == 'webfinger') {
1536                                                 $connect_url = str_replace('acct:' , '', $url->value);
1537                                                 continue;
1538                                         }
1539                                 }
1540                         }
1541
1542                         if (isset($entry->photos)) {
1543                                 foreach ($entry->photos as $photo) {
1544                                         if ($photo->type == 'profile') {
1545                                                 $profile_photo = $photo->value;
1546                                                 continue;
1547                                         }
1548                                 }
1549                         }
1550
1551                         if (isset($entry->updated)) {
1552                                 $updated = date("Y-m-d H:i:s", strtotime($entry->updated));
1553                         }
1554
1555                         if (isset($entry->network)) {
1556                                 $network = $entry->network;
1557                         }
1558
1559                         if (isset($entry->currentLocation)) {
1560                                 $location = $entry->currentLocation;
1561                         }
1562
1563                         if (isset($entry->aboutMe)) {
1564                                 $about = html2bbcode($entry->aboutMe);
1565                         }
1566
1567                         if (isset($entry->gender)) {
1568                                 $gender = $entry->gender;
1569                         }
1570
1571                         if (isset($entry->generation) && ($entry->generation > 0)) {
1572                                 $generation = ++$entry->generation;
1573                         }
1574
1575                         if (isset($entry->contactType) && ($entry->contactType >= 0)) {
1576                                 $contact_type = $entry->contactType;
1577                         }
1578
1579                         if (isset($entry->tags)) {
1580                                 foreach ($entry->tags as $tag) {
1581                                         $keywords = implode(", ", $tag);
1582                                 }
1583                         }
1584
1585                         if ($generation > 0) {
1586                                 $success = true;
1587
1588                                 logger("Store profile ".$profile_url, LOGGER_DEBUG);
1589
1590                                 $gcontact = ["url" => $profile_url,
1591                                                 "name" => $name,
1592                                                 "network" => $network,
1593                                                 "photo" => $profile_photo,
1594                                                 "about" => $about,
1595                                                 "location" => $location,
1596                                                 "gender" => $gender,
1597                                                 "keywords" => $keywords,
1598                                                 "connect" => $connect_url,
1599                                                 "updated" => $updated,
1600                                                 "contact-type" => $contact_type,
1601                                                 "generation" => $generation];
1602
1603                                 try {
1604                                         $gcontact = GContact::sanitize($gcontact);
1605                                         GContact::update($gcontact);
1606                                 } catch (Exception $e) {
1607                                         logger($e->getMessage(), LOGGER_DEBUG);
1608                                 }
1609
1610                                 logger("Done for profile ".$profile_url, LOGGER_DEBUG);
1611                         }
1612                 }
1613                 return $success;
1614         }
1615
1616 }