src/Protocol/PortableContact.php

   1 <?php
   2 /**
   3  * @file src/Protocol/PortableContact.php
   4  *
   5  * @todo Move GNU Social URL schemata (http://server.tld/user/number) to http://server.tld/username
   6  * @todo Fetch profile data from profile page for Redmatrix users
   7  * @todo Detect if it is a forum
   8  */
   9
  10 namespace Friendica\Protocol;
  11
  12 use Friendica\Content\Text\HTML;
  13 use Friendica\Core\Config;
  14 use Friendica\Core\Worker;
  15 use Friendica\Database\DBM;
  16 use Friendica\Model\GContact;
  17 use Friendica\Model\Profile;
  18 use Friendica\Network\Probe;
  19 use Friendica\Util\DateTimeFormat;
  20 use Friendica\Util\Network;
  21 use dba;
  22 use DOMDocument;
  23 use DOMXPath;
  24 use Exception;
  25
  26 require_once 'include/dba.php';
  27
  28 class PortableContact
  29 {
  30         /**
  31          * @brief Fetch POCO data
  32          *
  33          * @param integer $cid  Contact ID
  34          * @param integer $uid  User ID
  35          * @param integer $zcid Global Contact ID
  36          * @param integer $url  POCO address that should be polled
  37          *
  38          * Given a contact-id (minimum), load the PortableContacts friend list for that contact,
  39          * and add the entries to the gcontact (Global Contact) table, or update existing entries
  40          * if anything (name or photo) has changed.
  41          * We use normalised urls for comparison which ignore http vs https and www.domain vs domain
  42          *
  43          * Once the global contact is stored add (if necessary) the contact linkage which associates
  44          * the given uid, cid to the global contact entry. There can be many uid/cid combinations
  45          * pointing to the same global contact id.
  46          *
  47          */
  48         public static function loadWorker($cid, $uid = 0, $zcid = 0, $url = null)
  49         {
  50                 // Call the function "load" via the worker
  51                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "load", (int)$cid, (int)$uid, (int)$zcid, $url);
  52         }
  53
  54         /**
  55          * @brief Fetch POCO data from the worker
  56          *
  57          * @param integer $cid  Contact ID
  58          * @param integer $uid  User ID
  59          * @param integer $zcid Global Contact ID
  60          * @param integer $url  POCO address that should be polled
  61          *
  62          */
  63         public static function load($cid, $uid, $zcid, $url)
  64         {
  65                 $a = get_app();
  66
  67                 if ($cid) {
  68                         if (!$url || !$uid) {
  69                                 $contact = dba::selectFirst('contact', ['poco', 'uid'], ['id' => $cid]);
  70                                 if (DBM::is_result($contact)) {
  71                                         $url = $contact['poco'];
  72                                         $uid = $contact['uid'];
  73                                 }
  74                         }
  75                         if (!$uid) {
  76                                 return;
  77                         }
  78                 }
  79
  80                 if (!$url) {
  81                         return;
  82                 }
  83
  84                 $url = $url . (($uid) ? '/@me/@all?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation' : '?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation') ;
  85
  86                 logger('load: ' . $url, LOGGER_DEBUG);
  87
  88                 $s = Network::fetchUrl($url);
  89
  90                 logger('load: returns ' . $s, LOGGER_DATA);
  91
  92                 logger('load: return code: ' . $a->get_curl_code(), LOGGER_DEBUG);
  93
  94                 if (($a->get_curl_code() > 299) || (! $s)) {
  95                         return;
  96                 }
  97
  98                 $j = json_decode($s);
  99
 100                 logger('load: json: ' . print_r($j, true), LOGGER_DATA);
 101
 102                 if (! isset($j->entry)) {
 103                         return;
 104                 }
 105
 106                 $total = 0;
 107                 foreach ($j->entry as $entry) {
 108                         $total ++;
 109                         $profile_url = '';
 110                         $profile_photo = '';
 111                         $connect_url = '';
 112                         $name = '';
 113                         $network = '';
 114                         $updated = NULL_DATE;
 115                         $location = '';
 116                         $about = '';
 117                         $keywords = '';
 118                         $gender = '';
 119                         $contact_type = -1;
 120                         $generation = 0;
 121
 122                         $name = $entry->displayName;
 123
 124                         if (isset($entry->urls)) {
 125                                 foreach ($entry->urls as $url) {
 126                                         if ($url->type == 'profile') {
 127                                                 $profile_url = $url->value;
 128                                                 continue;
 129                                         }
 130                                         if ($url->type == 'webfinger') {
 131                                                 $connect_url = str_replace('acct:', '', $url->value);
 132                                                 continue;
 133                                         }
 134                                 }
 135                         }
 136                         if (isset($entry->photos)) {
 137                                 foreach ($entry->photos as $photo) {
 138                                         if ($photo->type == 'profile') {
 139                                                 $profile_photo = $photo->value;
 140                                                 continue;
 141                                         }
 142                                 }
 143                         }
 144
 145                         if (isset($entry->updated)) {
 146                                 $updated = date(DateTimeFormat::MYSQL, strtotime($entry->updated));
 147                         }
 148
 149                         if (isset($entry->network)) {
 150                                 $network = $entry->network;
 151                         }
 152
 153                         if (isset($entry->currentLocation)) {
 154                                 $location = $entry->currentLocation;
 155                         }
 156
 157                         if (isset($entry->aboutMe)) {
 158                                 $about = HTML::toBBCode($entry->aboutMe);
 159                         }
 160
 161                         if (isset($entry->gender)) {
 162                                 $gender = $entry->gender;
 163                         }
 164
 165                         if (isset($entry->generation) && ($entry->generation > 0)) {
 166                                 $generation = ++$entry->generation;
 167                         }
 168
 169                         if (isset($entry->tags)) {
 170                                 foreach ($entry->tags as $tag) {
 171                                         $keywords = implode(", ", $tag);
 172                                 }
 173                         }
 174
 175                         if (isset($entry->contactType) && ($entry->contactType >= 0)) {
 176                                 $contact_type = $entry->contactType;
 177                         }
 178
 179                         $gcontact = ["url" => $profile_url,
 180                                         "name" => $name,
 181                                         "network" => $network,
 182                                         "photo" => $profile_photo,
 183                                         "about" => $about,
 184                                         "location" => $location,
 185                                         "gender" => $gender,
 186                                         "keywords" => $keywords,
 187                                         "connect" => $connect_url,
 188                                         "updated" => $updated,
 189                                         "contact-type" => $contact_type,
 190                                         "generation" => $generation];
 191
 192                         try {
 193                                 $gcontact = GContact::sanitize($gcontact);
 194                                 $gcid = GContact::update($gcontact);
 195
 196                                 GContact::link($gcid, $uid, $cid, $zcid);
 197                         } catch (Exception $e) {
 198                                 logger($e->getMessage(), LOGGER_DEBUG);
 199                         }
 200                 }
 201                 logger("load: loaded $total entries", LOGGER_DEBUG);
 202
 203                 $condition = ["`cid` = ? AND `uid` = ? AND `zcid` = ? AND `updated` < UTC_TIMESTAMP - INTERVAL 2 DAY", $cid, $uid, $zcid];
 204                 dba::delete('glink', $condition);
 205         }
 206
 207         public static function reachable($profile, $server = "", $network = "", $force = false)
 208         {
 209                 if ($server == "") {
 210                         $server = self::detectServer($profile);
 211                 }
 212
 213                 if ($server == "") {
 214                         return true;
 215                 }
 216
 217                 return self::checkServer($server, $network, $force);
 218         }
 219
 220         public static function detectServer($profile)
 221         {
 222                 // Try to detect the server path based upon some known standard paths
 223                 $server_url = "";
 224
 225                 if ($server_url == "") {
 226                         $friendica = preg_replace("=(https?://)(.*)/profile/(.*)=ism", "$1$2", $profile);
 227                         if ($friendica != $profile) {
 228                                 $server_url = $friendica;
 229                                 $network = NETWORK_DFRN;
 230                         }
 231                 }
 232
 233                 if ($server_url == "") {
 234                         $diaspora = preg_replace("=(https?://)(.*)/u/(.*)=ism", "$1$2", $profile);
 235                         if ($diaspora != $profile) {
 236                                 $server_url = $diaspora;
 237                                 $network = NETWORK_DIASPORA;
 238                         }
 239                 }
 240
 241                 if ($server_url == "") {
 242                         $red = preg_replace("=(https?://)(.*)/channel/(.*)=ism", "$1$2", $profile);
 243                         if ($red != $profile) {
 244                                 $server_url = $red;
 245                                 $network = NETWORK_DIASPORA;
 246                         }
 247                 }
 248
 249                 // Mastodon
 250                 if ($server_url == "") {
 251                         $mastodon = preg_replace("=(https?://)(.*)/users/(.*)=ism", "$1$2", $profile);
 252                         if ($mastodon != $profile) {
 253                                 $server_url = $mastodon;
 254                                 $network = NETWORK_OSTATUS;
 255                         }
 256                 }
 257
 258                 // Numeric OStatus variant
 259                 if ($server_url == "") {
 260                         $ostatus = preg_replace("=(https?://)(.*)/user/(.*)=ism", "$1$2", $profile);
 261                         if ($ostatus != $profile) {
 262                                 $server_url = $ostatus;
 263                                 $network = NETWORK_OSTATUS;
 264                         }
 265                 }
 266
 267                 // Wild guess
 268                 if ($server_url == "") {
 269                         $base = preg_replace("=(https?://)(.*?)/(.*)=ism", "$1$2", $profile);
 270                         if ($base != $profile) {
 271                                 $server_url = $base;
 272                                 $network = NETWORK_PHANTOM;
 273                         }
 274                 }
 275
 276                 if ($server_url == "") {
 277                         return "";
 278                 }
 279
 280                 $r = q(
 281                         "SELECT `id` FROM `gserver` WHERE `nurl` = '%s' AND `last_contact` > `last_failure`",
 282                         dbesc(normalise_link($server_url))
 283                 );
 284
 285                 if (DBM::is_result($r)) {
 286                         return $server_url;
 287                 }
 288
 289                 // Fetch the host-meta to check if this really is a server
 290                 $serverret = Network::curl($server_url."/.well-known/host-meta");
 291                 if (!$serverret["success"]) {
 292                         return "";
 293                 }
 294
 295                 return $server_url;
 296         }
 297
 298         public static function alternateOStatusUrl($url)
 299         {
 300                 return(preg_match("=https?://.+/user/\d+=ism", $url, $matches));
 301         }
 302
 303         public static function lastUpdated($profile, $force = false)
 304         {
 305                 $gcontacts = q(
 306                         "SELECT * FROM `gcontact` WHERE `nurl` = '%s'",
 307                         dbesc(normalise_link($profile))
 308                 );
 309
 310                 if (!DBM::is_result($gcontacts)) {
 311                         return false;
 312                 }
 313
 314                 $contact = ["url" => $profile];
 315
 316                 if ($gcontacts[0]["created"] <= NULL_DATE) {
 317                         $contact['created'] = DateTimeFormat::utcNow();
 318                 }
 319
 320                 $server_url = '';
 321                 if ($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' => DateTimeFormat::utcNow()];
 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                                 $noscraperet = Network::curl($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"] = DateTimeFormat::utcNow();
 416
 417                                                 $contact = array_merge($contact, $noscrape);
 418
 419                                                 GContact::update($contact);
 420
 421                                                 if (trim($noscrape["updated"]) != "") {
 422                                                         $fields = ['last_contact' => DateTimeFormat::utcNow()];
 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' => DateTimeFormat::utcNow()];
 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                 $feedret = Network::curl($data["poll"]);
 485
 486                 if (!$feedret["success"]) {
 487                         $fields = ['last_failure' => DateTimeFormat::utcNow()];
 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                         $published = DateTimeFormat::utc($xpath->query('atom:published/text()', $entry)->item(0)->nodeValue);
 506                         $updated   = DateTimeFormat::utc($xpath->query('atom:updated/text()'  , $entry)->item(0)->nodeValue);
 507
 508                         if ($last_updated < $published) {
 509                                 $last_updated = $published;
 510                         }
 511
 512                         if ($last_updated < $updated) {
 513                                 $last_updated = $updated;
 514                         }
 515                 }
 516
 517                 // Maybe there aren't any entries. Then check if it is a valid feed
 518                 if ($last_updated == "") {
 519                         if ($xpath->query('/atom:feed')->length > 0) {
 520                                 $last_updated = NULL_DATE;
 521                         }
 522                 }
 523
 524                 $fields = ['updated' => $last_updated, 'last_contact' => DateTimeFormat::utcNow()];
 525                 dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 526
 527                 if (($gcontacts[0]["generation"] == 0)) {
 528                         $fields = ['generation' => 9];
 529                         dba::update('gcontact', $fields, ['nurl' => normalise_link($profile)]);
 530                 }
 531
 532                 logger("Profile ".$profile." was last updated at ".$last_updated, LOGGER_DEBUG);
 533
 534                 return $last_updated;
 535         }
 536
 537         public static function updateNeeded($created, $updated, $last_failure, $last_contact)
 538         {
 539                 $now = strtotime(DateTimeFormat::utcNow());
 540
 541                 if ($updated > $last_contact) {
 542                         $contact_time = strtotime($updated);
 543                 } else {
 544                         $contact_time = strtotime($last_contact);
 545                 }
 546
 547                 $failure_time = strtotime($last_failure);
 548                 $created_time = strtotime($created);
 549
 550                 // If there is no "created" time then use the current time
 551                 if ($created_time <= 0) {
 552                         $created_time = $now;
 553                 }
 554
 555                 // If the last contact was less than 24 hours then don't update
 556                 if (($now - $contact_time) < (60 * 60 * 24)) {
 557                         return false;
 558                 }
 559
 560                 // If the last failure was less than 24 hours then don't update
 561                 if (($now - $failure_time) < (60 * 60 * 24)) {
 562                         return false;
 563                 }
 564
 565                 // If the last contact was less than a week ago and the last failure is older than a week then don't update
 566                 //if ((($now - $contact_time) < (60 * 60 * 24 * 7)) && ($contact_time > $failure_time))
 567                 //      return false;
 568
 569                 // If the last contact time was more than a week ago and the contact was created more than a week ago, then only try once a week
 570                 if ((($now - $contact_time) > (60 * 60 * 24 * 7)) && (($now - $created_time) > (60 * 60 * 24 * 7)) && (($now - $failure_time) < (60 * 60 * 24 * 7))) {
 571                         return false;
 572                 }
 573
 574                 // If the last contact time was more than a month ago and the contact was created more than a month ago, then only try once a month
 575                 if ((($now - $contact_time) > (60 * 60 * 24 * 30)) && (($now - $created_time) > (60 * 60 * 24 * 30)) && (($now - $failure_time) < (60 * 60 * 24 * 30))) {
 576                         return false;
 577                 }
 578
 579                 return true;
 580         }
 581
 582         private static function toBoolean($val)
 583         {
 584                 if (($val == "true") || ($val == 1)) {
 585                         return true;
 586                 } elseif (($val == "false") || ($val == 0)) {
 587                         return false;
 588                 }
 589
 590                 return $val;
 591         }
 592
 593         /**
 594          * @brief Detect server type (Hubzilla or Friendica) via the poco data
 595          *
 596          * @param object $data POCO data
 597          * @return array Server data
 598          */
 599         private static function detectPocoData($data)
 600         {
 601                 $server = false;
 602
 603                 if (!isset($data->entry)) {
 604                         return false;
 605                 }
 606
 607                 if (count($data->entry) == 0) {
 608                         return false;
 609                 }
 610
 611                 if (!isset($data->entry[0]->urls)) {
 612                         return false;
 613                 }
 614
 615                 if (count($data->entry[0]->urls) == 0) {
 616                         return false;
 617                 }
 618
 619                 foreach ($data->entry[0]->urls as $url) {
 620                         if ($url->type == 'zot') {
 621                                 $server = [];
 622                                 $server["platform"] = 'Hubzilla';
 623                                 $server["network"] = NETWORK_DIASPORA;
 624                                 return $server;
 625                         }
 626                 }
 627                 return false;
 628         }
 629
 630         /**
 631          * @brief Detect server type by using the nodeinfo data
 632          *
 633          * @param string $server_url address of the server
 634          * @return array Server data
 635          */
 636         private static function fetchNodeinfo($server_url)
 637         {
 638                 $serverret = Network::curl($server_url."/.well-known/nodeinfo");
 639                 if (!$serverret["success"]) {
 640                         return false;
 641                 }
 642
 643                 $nodeinfo = json_decode($serverret['body']);
 644
 645                 if (!is_object($nodeinfo)) {
 646                         return false;
 647                 }
 648
 649                 if (!is_array($nodeinfo->links)) {
 650                         return false;
 651                 }
 652
 653                 $nodeinfo1_url = '';
 654                 $nodeinfo2_url = '';
 655
 656                 foreach ($nodeinfo->links as $link) {
 657                         if ($link->rel == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
 658                                 $nodeinfo1_url = $link->href;
 659                         }
 660                         if ($link->rel == 'http://nodeinfo.diaspora.software/ns/schema/2.0') {
 661                                 $nodeinfo2_url = $link->href;
 662                         }
 663                 }
 664
 665                 if ($nodeinfo1_url . $nodeinfo2_url == '') {
 666                         return false;
 667                 }
 668
 669                 $server = [];
 670
 671                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 672                 if (!empty($nodeinfo2_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo2_url, PHP_URL_HOST))) {
 673                         $server = self::parseNodeinfo2($nodeinfo2_url);
 674                 }
 675
 676                 // When the nodeinfo url isn't on the same host, then there is obviously something wrong
 677                 if (empty($server) && !empty($nodeinfo1_url) && (parse_url($server_url, PHP_URL_HOST) == parse_url($nodeinfo1_url, PHP_URL_HOST))) {
 678                         $server = self::parseNodeinfo1($nodeinfo1_url);
 679                 }
 680
 681                 return $server;
 682         }
 683
 684         /**
 685          * @brief Parses Nodeinfo 1
 686          *
 687          * @param string $nodeinfo_url address of the nodeinfo path
 688          * @return array Server data
 689          */
 690         private static function parseNodeinfo1($nodeinfo_url)
 691         {
 692                 $serverret = Network::curl($nodeinfo_url);
 693                 if (!$serverret["success"]) {
 694                         return false;
 695                 }
 696
 697                 $nodeinfo = json_decode($serverret['body']);
 698                 if (!is_object($nodeinfo)) {
 699                         return false;
 700                 }
 701
 702                 $server = [];
 703
 704                 $server['register_policy'] = REGISTER_CLOSED;
 705
 706                 if (is_bool($nodeinfo->openRegistrations) && $nodeinfo->openRegistrations) {
 707                         $server['register_policy'] = REGISTER_OPEN;
 708                 }
 709
 710                 if (is_object($nodeinfo->software)) {
 711                         if (isset($nodeinfo->software->name)) {
 712                                 $server['platform'] = $nodeinfo->software->name;
 713                         }
 714
 715                         if (isset($nodeinfo->software->version)) {
 716                                 $server['version'] = $nodeinfo->software->version;
 717                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 718                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 719                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 720                         }
 721                 }
 722
 723                 if (is_object($nodeinfo->metadata)) {
 724                         if (isset($nodeinfo->metadata->nodeName)) {
 725                                 $server['site_name'] = $nodeinfo->metadata->nodeName;
 726                         }
 727                 }
 728
 729                 if (!empty($nodeinfo->usage->users->total)) {
 730                         $server['registered-users'] = $nodeinfo->usage->users->total;
 731                 }
 732
 733                 $diaspora = false;
 734                 $friendica = false;
 735                 $gnusocial = false;
 736
 737                 if (is_array($nodeinfo->protocols->inbound)) {
 738                         foreach ($nodeinfo->protocols->inbound as $inbound) {
 739                                 if ($inbound == 'diaspora') {
 740                                         $diaspora = true;
 741                                 }
 742                                 if ($inbound == 'friendica') {
 743                                         $friendica = true;
 744                                 }
 745                                 if ($inbound == 'gnusocial') {
 746                                         $gnusocial = true;
 747                                 }
 748                         }
 749                 }
 750
 751                 if ($gnusocial) {
 752                         $server['network'] = NETWORK_OSTATUS;
 753                 }
 754                 if ($diaspora) {
 755                         $server['network'] = NETWORK_DIASPORA;
 756                 }
 757                 if ($friendica) {
 758                         $server['network'] = NETWORK_DFRN;
 759                 }
 760
 761                 if (!$server) {
 762                         return false;
 763                 }
 764
 765                 return $server;
 766         }
 767
 768         /**
 769          * @brief Parses Nodeinfo 2
 770          *
 771          * @param string $nodeinfo_url address of the nodeinfo path
 772          * @return array Server data
 773          */
 774         private static function parseNodeinfo2($nodeinfo_url)
 775         {
 776                 $serverret = Network::curl($nodeinfo_url);
 777                 if (!$serverret["success"]) {
 778                         return false;
 779                 }
 780
 781                 $nodeinfo = json_decode($serverret['body']);
 782                 if (!is_object($nodeinfo)) {
 783                         return false;
 784                 }
 785
 786                 $server = [];
 787
 788                 $server['register_policy'] = REGISTER_CLOSED;
 789
 790                 if (is_bool($nodeinfo->openRegistrations) && $nodeinfo->openRegistrations) {
 791                         $server['register_policy'] = REGISTER_OPEN;
 792                 }
 793
 794                 if (is_object($nodeinfo->software)) {
 795                         if (isset($nodeinfo->software->name)) {
 796                                 $server['platform'] = $nodeinfo->software->name;
 797                         }
 798
 799                         if (isset($nodeinfo->software->version)) {
 800                                 $server['version'] = $nodeinfo->software->version;
 801                                 // Version numbers on Nodeinfo are presented with additional info, e.g.:
 802                                 // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
 803                                 $server['version'] = preg_replace("=(.+)-(.{4,})=ism", "$1", $server['version']);
 804                         }
 805                 }
 806
 807                 if (is_object($nodeinfo->metadata)) {
 808                         if (isset($nodeinfo->metadata->nodeName)) {
 809                                 $server['site_name'] = $nodeinfo->metadata->nodeName;
 810                         }
 811                 }
 812
 813                 if (!empty($nodeinfo->usage->users->total)) {
 814                         $server['registered-users'] = $nodeinfo->usage->users->total;
 815                 }
 816
 817                 $diaspora = false;
 818                 $friendica = false;
 819                 $gnusocial = false;
 820
 821                 if (is_array($nodeinfo->protocols)) {
 822                         foreach ($nodeinfo->protocols as $protocol) {
 823                                 if ($protocol == 'diaspora') {
 824                                         $diaspora = true;
 825                                 }
 826                                 if ($protocol == 'friendica') {
 827                                         $friendica = true;
 828                                 }
 829                                 if ($protocol == 'gnusocial') {
 830                                         $gnusocial = true;
 831                                 }
 832                         }
 833                 }
 834
 835                 if ($gnusocial) {
 836                         $server['network'] = NETWORK_OSTATUS;
 837                 }
 838                 if ($diaspora) {
 839                         $server['network'] = NETWORK_DIASPORA;
 840                 }
 841                 if ($friendica) {
 842                         $server['network'] = NETWORK_DFRN;
 843                 }
 844
 845                 if (!$server) {
 846                         return false;
 847                 }
 848
 849                 return $server;
 850         }
 851
 852         /**
 853          * @brief Detect server type (Hubzilla or Friendica) via the front page body
 854          *
 855          * @param string $body Front page of the server
 856          * @return array Server data
 857          */
 858         private static function detectServerType($body)
 859         {
 860                 $server = false;
 861
 862                 $doc = new DOMDocument();
 863                 @$doc->loadHTML($body);
 864                 $xpath = new DOMXPath($doc);
 865
 866                 $list = $xpath->query("//meta[@name]");
 867
 868                 foreach ($list as $node) {
 869                         $attr = [];
 870                         if ($node->attributes->length) {
 871                                 foreach ($node->attributes as $attribute) {
 872                                         $attr[$attribute->name] = $attribute->value;
 873                                 }
 874                         }
 875                         if ($attr['name'] == 'generator') {
 876                                 $version_part = explode(" ", $attr['content']);
 877                                 if (count($version_part) == 2) {
 878                                         if (in_array($version_part[0], ["Friendika", "Friendica"])) {
 879                                                 $server = [];
 880                                                 $server["platform"] = $version_part[0];
 881                                                 $server["version"] = $version_part[1];
 882                                                 $server["network"] = NETWORK_DFRN;
 883                                         }
 884                                 }
 885                         }
 886                 }
 887
 888                 if (!$server) {
 889                         $list = $xpath->query("//meta[@property]");
 890
 891                         foreach ($list as $node) {
 892                                 $attr = [];
 893                                 if ($node->attributes->length) {
 894                                         foreach ($node->attributes as $attribute) {
 895                                                 $attr[$attribute->name] = $attribute->value;
 896                                         }
 897                                 }
 898                                 if ($attr['property'] == 'generator' && in_array($attr['content'], ["hubzilla", "BlaBlaNet"])) {
 899                                         $server = [];
 900                                         $server["platform"] = $attr['content'];
 901                                         $server["version"] = "";
 902                                         $server["network"] = NETWORK_DIASPORA;
 903                                 }
 904                         }
 905                 }
 906
 907                 if (!$server) {
 908                         return false;
 909                 }
 910
 911                 $server["site_name"] = $xpath->evaluate("//head/title/text()")->item(0)->nodeValue;
 912                 return $server;
 913         }
 914
 915         public static function checkServer($server_url, $network = "", $force = false)
 916         {
 917                 // Unify the server address
 918                 $server_url = trim($server_url, "/");
 919                 $server_url = str_replace("/index.php", "", $server_url);
 920
 921                 if ($server_url == "") {
 922                         return false;
 923                 }
 924
 925                 $gserver = dba::selectFirst('gserver', [], ['nurl' => normalise_link($server_url)]);
 926                 if (DBM::is_result($gserver)) {
 927                         if ($gserver["created"] <= NULL_DATE) {
 928                                 $fields = ['created' => DateTimeFormat::utcNow()];
 929                                 $condition = ['nurl' => normalise_link($server_url)];
 930                                 dba::update('gserver', $fields, $condition);
 931                         }
 932                         $poco = $gserver["poco"];
 933                         $noscrape = $gserver["noscrape"];
 934
 935                         if ($network == "") {
 936                                 $network = $gserver["network"];
 937                         }
 938
 939                         $last_contact = $gserver["last_contact"];
 940                         $last_failure = $gserver["last_failure"];
 941                         $version = $gserver["version"];
 942                         $platform = $gserver["platform"];
 943                         $site_name = $gserver["site_name"];
 944                         $info = $gserver["info"];
 945                         $register_policy = $gserver["register_policy"];
 946                         $registered_users = $gserver["registered-users"];
 947
 948                         // See discussion under https://forum.friendi.ca/display/0b6b25a8135aabc37a5a0f5684081633
 949                         // It can happen that a zero date is in the database, but storing it again is forbidden.
 950                         if ($last_contact < NULL_DATE) {
 951                                 $last_contact = NULL_DATE;
 952                         }
 953                         if ($last_failure < NULL_DATE) {
 954                                 $last_failure = NULL_DATE;
 955                         }
 956
 957                         if (!$force && !self::updateNeeded($gserver["created"], "", $last_failure, $last_contact)) {
 958                                 logger("Use cached data for server ".$server_url, LOGGER_DEBUG);
 959                                 return ($last_contact >= $last_failure);
 960                         }
 961                 } else {
 962                         $poco = "";
 963                         $noscrape = "";
 964                         $version = "";
 965                         $platform = "";
 966                         $site_name = "";
 967                         $info = "";
 968                         $register_policy = -1;
 969                         $registered_users = 0;
 970
 971                         $last_contact = NULL_DATE;
 972                         $last_failure = NULL_DATE;
 973                 }
 974                 logger("Server ".$server_url." is outdated or unknown. Start discovery. Force: ".$force." Created: ".$gserver["created"]." Failure: ".$last_failure." Contact: ".$last_contact, LOGGER_DEBUG);
 975
 976                 $failure = false;
 977                 $possible_failure = false;
 978                 $orig_last_failure = $last_failure;
 979                 $orig_last_contact = $last_contact;
 980
 981                 // Mastodon uses the "@" for user profiles.
 982                 // But this can be misunderstood.
 983                 if (parse_url($server_url, PHP_URL_USER) != '') {
 984                         dba::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
 985                         return false;
 986                 }
 987
 988                 // Check if the page is accessible via SSL.
 989                 $orig_server_url = $server_url;
 990                 $server_url = str_replace("http://", "https://", $server_url);
 991
 992                 // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
 993                 $serverret = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
 994
 995                 // Quit if there is a timeout.
 996                 // But we want to make sure to only quit if we are mostly sure that this server url fits.
 997                 if (DBM::is_result($gserver) && ($orig_server_url == $server_url) &&
 998                         ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT)) {
 999                         logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
1000                         dba::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
1001                         return false;
1002                 }
1003
1004                 // Maybe the page is unencrypted only?
1005                 $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1006                 if (!$serverret["success"] || ($serverret["body"] == "") || (@sizeof($xmlobj) == 0) || !is_object($xmlobj)) {
1007                         $server_url = str_replace("https://", "http://", $server_url);
1008
1009                         // We set the timeout to 20 seconds since this operation should be done in no time if the server was vital
1010                         $serverret = Network::curl($server_url."/.well-known/host-meta", false, $redirects, ['timeout' => 20]);
1011
1012                         // Quit if there is a timeout
1013                         if ($serverret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1014                                 logger("Connection to server ".$server_url." timed out.", LOGGER_DEBUG);
1015                                 dba::update('gserver', ['last_failure' => DateTimeFormat::utcNow()], ['nurl' => normalise_link($server_url)]);
1016                                 return false;
1017                         }
1018
1019                         $xmlobj = @simplexml_load_string($serverret["body"], 'SimpleXMLElement', 0, "http://docs.oasis-open.org/ns/xri/xrd-1.0");
1020                 }
1021
1022                 if (!$serverret["success"] || ($serverret["body"] == "") || (sizeof($xmlobj) == 0) || !is_object($xmlobj)) {
1023                         // Workaround for bad configured servers (known nginx problem)
1024                         if (!in_array($serverret["debug"]["http_code"], ["403", "404"])) {
1025                                 $failure = true;
1026                         }
1027                         $possible_failure = true;
1028                 }
1029
1030                 // If the server has no possible failure we reset the cached data
1031                 if (!$possible_failure) {
1032                         $version = "";
1033                         $platform = "";
1034                         $site_name = "";
1035                         $info = "";
1036                         $register_policy = -1;
1037                 }
1038
1039                 if (!$failure) {
1040                         // This will be too low, but better than no value at all.
1041                         $registered_users = dba::count('gcontact', ['server_url' => normalise_link($server_url)]);
1042                 }
1043
1044                 // Look for poco
1045                 if (!$failure) {
1046                         $serverret = Network::curl($server_url."/poco");
1047                         if ($serverret["success"]) {
1048                                 $data = json_decode($serverret["body"]);
1049                                 if (isset($data->totalResults)) {
1050                                         $registered_users = $data->totalResults;
1051                                         $poco = $server_url."/poco";
1052                                         $server = self::detectPocoData($data);
1053                                         if ($server) {
1054                                                 $platform = $server['platform'];
1055                                                 $network = $server['network'];
1056                                                 $version = '';
1057                                                 $site_name = '';
1058                                         }
1059                                 }
1060                                 // There are servers out there who don't return 404 on a failure
1061                                 // We have to be sure that don't misunderstand this
1062                                 if (is_null($data)) {
1063                                         $poco = "";
1064                                         $noscrape = "";
1065                                         $network = "";
1066                                 }
1067                         }
1068                 }
1069
1070                 if (!$failure) {
1071                         // Test for Diaspora, Hubzilla, Mastodon or older Friendica servers
1072                         $serverret = Network::curl($server_url);
1073
1074                         if (!$serverret["success"] || ($serverret["body"] == "")) {
1075                                 $failure = true;
1076                         } else {
1077                                 $server = self::detectServerType($serverret["body"]);
1078                                 if ($server) {
1079                                         $platform = $server['platform'];
1080                                         $network = $server['network'];
1081                                         $version = $server['version'];
1082                                         $site_name = $server['site_name'];
1083                                 }
1084
1085                                 $lines = explode("\n", $serverret["header"]);
1086                                 if (count($lines)) {
1087                                         foreach ($lines as $line) {
1088                                                 $line = trim($line);
1089                                                 if (stristr($line, 'X-Diaspora-Version:')) {
1090                                                         $platform = "Diaspora";
1091                                                         $version = trim(str_replace("X-Diaspora-Version:", "", $line));
1092                                                         $version = trim(str_replace("x-diaspora-version:", "", $version));
1093                                                         $network = NETWORK_DIASPORA;
1094                                                         $versionparts = explode("-", $version);
1095                                                         $version = $versionparts[0];
1096                                                 }
1097
1098                                                 if (stristr($line, 'Server: Mastodon')) {
1099                                                         $platform = "Mastodon";
1100                                                         $network = NETWORK_OSTATUS;
1101                                                 }
1102                                         }
1103                                 }
1104                         }
1105                 }
1106
1107                 if (!$failure && ($poco == "")) {
1108                         // Test for Statusnet
1109                         // Will also return data for Friendica and GNU Social - but it will be overwritten later
1110                         // The "not implemented" is a special treatment for really, really old Friendica versions
1111                         $serverret = Network::curl($server_url."/api/statusnet/version.json");
1112                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
1113                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
1114                                 $platform = "StatusNet";
1115                                 // Remove junk that some GNU Social servers return
1116                                 $version = str_replace(chr(239).chr(187).chr(191), "", $serverret["body"]);
1117                                 $version = trim($version, '"');
1118                                 $network = NETWORK_OSTATUS;
1119                         }
1120
1121                         // Test for GNU Social
1122                         $serverret = Network::curl($server_url."/api/gnusocial/version.json");
1123                         if ($serverret["success"] && ($serverret["body"] != '{"error":"not implemented"}') &&
1124                                 ($serverret["body"] != '') && (strlen($serverret["body"]) < 30)) {
1125                                 $platform = "GNU Social";
1126                                 // Remove junk that some GNU Social servers return
1127                                 $version = str_replace(chr(239).chr(187).chr(191), "", $serverret["body"]);
1128                                 $version = trim($version, '"');
1129                                 $network = NETWORK_OSTATUS;
1130                         }
1131
1132                         // Test for Mastodon
1133                         $orig_version = $version;
1134                         $serverret = Network::curl($server_url."/api/v1/instance");
1135                         if ($serverret["success"] && ($serverret["body"] != '')) {
1136                                 $data = json_decode($serverret["body"]);
1137
1138                                 if (isset($data->version)) {
1139                                         $platform = "Mastodon";
1140                                         $version = $data->version;
1141                                         $site_name = $data->title;
1142                                         $info = $data->description;
1143                                         $network = NETWORK_OSTATUS;
1144                                 }
1145                                 if (!empty($data->stats->user_count)) {
1146                                         $registered_users = $data->stats->user_count;
1147                                 }
1148                         }
1149                         if (strstr($orig_version.$version, 'Pleroma')) {
1150                                 $platform = 'Pleroma';
1151                                 $version = trim(str_replace('Pleroma', '', $version));
1152                         }
1153                 }
1154
1155                 if (!$failure) {
1156                         // Test for Hubzilla and Red
1157                         $serverret = Network::curl($server_url."/siteinfo.json");
1158                         if ($serverret["success"]) {
1159                                 $data = json_decode($serverret["body"]);
1160                                 if (isset($data->url)) {
1161                                         $platform = $data->platform;
1162                                         $version = $data->version;
1163                                         $network = NETWORK_DIASPORA;
1164                                 }
1165                                 if (!empty($data->site_name)) {
1166                                         $site_name = $data->site_name;
1167                                 }
1168                                 if (!empty($data->channels_total)) {
1169                                         $registered_users = $data->channels_total;
1170                                 }
1171                                 switch ($data->register_policy) {
1172                                         case "REGISTER_OPEN":
1173                                                 $register_policy = REGISTER_OPEN;
1174                                                 break;
1175                                         case "REGISTER_APPROVE":
1176                                                 $register_policy = REGISTER_APPROVE;
1177                                                 break;
1178                                         case "REGISTER_CLOSED":
1179                                         default:
1180                                                 $register_policy = REGISTER_CLOSED;
1181                                                 break;
1182                                 }
1183                         } else {
1184                                 // Test for Hubzilla, Redmatrix or Friendica
1185                                 $serverret = Network::curl($server_url."/api/statusnet/config.json");
1186                                 if ($serverret["success"]) {
1187                                         $data = json_decode($serverret["body"]);
1188                                         if (isset($data->site->server)) {
1189                                                 if (isset($data->site->platform)) {
1190                                                         $platform = $data->site->platform->PLATFORM_NAME;
1191                                                         $version = $data->site->platform->STD_VERSION;
1192                                                         $network = NETWORK_DIASPORA;
1193                                                 }
1194                                                 if (isset($data->site->BlaBlaNet)) {
1195                                                         $platform = $data->site->BlaBlaNet->PLATFORM_NAME;
1196                                                         $version = $data->site->BlaBlaNet->STD_VERSION;
1197                                                         $network = NETWORK_DIASPORA;
1198                                                 }
1199                                                 if (isset($data->site->hubzilla)) {
1200                                                         $platform = $data->site->hubzilla->PLATFORM_NAME;
1201                                                         $version = $data->site->hubzilla->RED_VERSION;
1202                                                         $network = NETWORK_DIASPORA;
1203                                                 }
1204                                                 if (isset($data->site->redmatrix)) {
1205                                                         if (isset($data->site->redmatrix->PLATFORM_NAME)) {
1206                                                                 $platform = $data->site->redmatrix->PLATFORM_NAME;
1207                                                         } elseif (isset($data->site->redmatrix->RED_PLATFORM)) {
1208                                                                 $platform = $data->site->redmatrix->RED_PLATFORM;
1209                                                         }
1210
1211                                                         $version = $data->site->redmatrix->RED_VERSION;
1212                                                         $network = NETWORK_DIASPORA;
1213                                                 }
1214                                                 if (isset($data->site->friendica)) {
1215                                                         $platform = $data->site->friendica->FRIENDICA_PLATFORM;
1216                                                         $version = $data->site->friendica->FRIENDICA_VERSION;
1217                                                         $network = NETWORK_DFRN;
1218                                                 }
1219
1220                                                 $site_name = $data->site->name;
1221
1222                                                 $data->site->closed = self::toBoolean($data->site->closed);
1223                                                 $data->site->private = self::toBoolean($data->site->private);
1224                                                 $data->site->inviteonly = self::toBoolean($data->site->inviteonly);
1225
1226                                                 if (!$data->site->closed && !$data->site->private and $data->site->inviteonly) {
1227                                                         $register_policy = REGISTER_APPROVE;
1228                                                 } elseif (!$data->site->closed && !$data->site->private) {
1229                                                         $register_policy = REGISTER_OPEN;
1230                                                 } else {
1231                                                         $register_policy = REGISTER_CLOSED;
1232                                                 }
1233                                         }
1234                                 }
1235                         }
1236                 }
1237
1238                 // Query statistics.json. Optional package for Diaspora, Friendica and Redmatrix
1239                 if (!$failure) {
1240                         $serverret = Network::curl($server_url."/statistics.json");
1241                         if ($serverret["success"]) {
1242                                 $data = json_decode($serverret["body"]);
1243
1244                                 if (isset($data->version)) {
1245                                         $version = $data->version;
1246                                         // Version numbers on statistics.json are presented with additional info, e.g.:
1247                                         // 0.6.3.0-p1702cc1c, 0.6.99.0-p1b9ab160 or 3.4.3-2-1191.
1248                                         $version = preg_replace("=(.+)-(.{4,})=ism", "$1", $version);
1249                                 }
1250
1251                                 if (!empty($data->name)) {
1252                                         $site_name = $data->name;
1253                                 }
1254
1255                                 if (!empty($data->network)) {
1256                                         $platform = $data->network;
1257                                 }
1258
1259                                 if ($platform == "Diaspora") {
1260                                         $network = NETWORK_DIASPORA;
1261                                 }
1262
1263                                 if ($data->registrations_open) {
1264                                         $register_policy = REGISTER_OPEN;
1265                                 } else {
1266                                         $register_policy = REGISTER_CLOSED;
1267                                 }
1268                         }
1269                 }
1270
1271                 // Query nodeinfo. Working for (at least) Diaspora and Friendica.
1272                 if (!$failure) {
1273                         $server = self::fetchNodeinfo($server_url);
1274                         if ($server) {
1275                                 $register_policy = $server['register_policy'];
1276
1277                                 if (isset($server['platform'])) {
1278                                         $platform = $server['platform'];
1279                                 }
1280
1281                                 if (isset($server['network'])) {
1282                                         $network = $server['network'];
1283                                 }
1284
1285                                 if (isset($server['version'])) {
1286                                         $version = $server['version'];
1287                                 }
1288
1289                                 if (isset($server['site_name'])) {
1290                                         $site_name = $server['site_name'];
1291                                 }
1292
1293                                 if (isset($server['registered-users'])) {
1294                                         $registered_users = $server['registered-users'];
1295                                 }
1296                         }
1297                 }
1298
1299                 // Check for noscrape
1300                 // Friendica servers could be detected as OStatus servers
1301                 if (!$failure && in_array($network, [NETWORK_DFRN, NETWORK_OSTATUS])) {
1302                         $serverret = Network::curl($server_url."/friendica/json");
1303
1304                         if (!$serverret["success"]) {
1305                                 $serverret = Network::curl($server_url."/friendika/json");
1306                         }
1307
1308                         if ($serverret["success"]) {
1309                                 $data = json_decode($serverret["body"]);
1310
1311                                 if (isset($data->version)) {
1312                                         $network = NETWORK_DFRN;
1313
1314                                         $noscrape = defaults($data->no_scrape_url, '');
1315                                         $version = $data->version;
1316                                         $site_name = $data->site_name;
1317                                         $info = $data->info;
1318                                         $register_policy_str = $data->register_policy;
1319                                         $platform = $data->platform;
1320
1321                                         switch ($register_policy_str) {
1322                                                 case "REGISTER_CLOSED":
1323                                                         $register_policy = REGISTER_CLOSED;
1324                                                         break;
1325                                                 case "REGISTER_APPROVE":
1326                                                         $register_policy = REGISTER_APPROVE;
1327                                                         break;
1328                                                 case "REGISTER_OPEN":
1329                                                         $register_policy = REGISTER_OPEN;
1330                                                         break;
1331                                         }
1332                                 }
1333                         }
1334                 }
1335
1336                 // Every server has got at least an admin account
1337                 if (!$failure && ($registered_users == 0)) {
1338                         $registered_users = 1;
1339                 }
1340
1341                 if ($possible_failure && !$failure) {
1342                         $failure = true;
1343                 }
1344
1345                 if ($failure) {
1346                         $last_contact = $orig_last_contact;
1347                         $last_failure = DateTimeFormat::utcNow();
1348                 } else {
1349                         $last_contact = DateTimeFormat::utcNow();
1350                         $last_failure = $orig_last_failure;
1351                 }
1352
1353                 if (($last_contact <= $last_failure) && !$failure) {
1354                         logger("Server ".$server_url." seems to be alive, but last contact wasn't set - could be a bug", LOGGER_DEBUG);
1355                 } elseif (($last_contact >= $last_failure) && $failure) {
1356                         logger("Server ".$server_url." seems to be dead, but last failure wasn't set - could be a bug", LOGGER_DEBUG);
1357                 }
1358
1359                 // Check again if the server exists
1360                 $found = dba::exists('gserver', ['nurl' => normalise_link($server_url)]);
1361
1362                 $version = strip_tags($version);
1363                 $site_name = strip_tags($site_name);
1364                 $info = strip_tags($info);
1365                 $platform = strip_tags($platform);
1366
1367                 $fields = ['url' => $server_url, 'version' => $version,
1368                                 'site_name' => $site_name, 'info' => $info, 'register_policy' => $register_policy,
1369                                 'poco' => $poco, 'noscrape' => $noscrape, 'network' => $network,
1370                                 'platform' => $platform, 'registered-users' => $registered_users,
1371                                 'last_contact' => $last_contact, 'last_failure' => $last_failure];
1372
1373                 if ($found) {
1374                         dba::update('gserver', $fields, ['nurl' => normalise_link($server_url)]);
1375                 } elseif (!$failure) {
1376                         $fields['nurl'] = normalise_link($server_url);
1377                         $fields['created'] = DateTimeFormat::utcNow();
1378                         dba::insert('gserver', $fields);
1379                 }
1380
1381                 if (!$failure && in_array($fields['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
1382                         self::discoverRelay($server_url);
1383                 }
1384
1385                 logger("End discovery for server " . $server_url, LOGGER_DEBUG);
1386
1387                 return !$failure;
1388         }
1389
1390         private static function discoverRelay($server_url)
1391         {
1392                 logger("Discover relay data for server " . $server_url, LOGGER_DEBUG);
1393
1394                 $serverret = Network::curl($server_url."/.well-known/x-social-relay");
1395                 if (!$serverret["success"]) {
1396                         return;
1397                 }
1398
1399                 $data = json_decode($serverret['body']);
1400                 if (!is_object($data)) {
1401                         return;
1402                 }
1403
1404                 $gserver = dba::selectFirst('gserver', ['id', 'relay-subscribe', 'relay-scope'], ['nurl' => normalise_link($server_url)]);
1405                 if (!DBM::is_result($gserver)) {
1406                         return;
1407                 }
1408
1409                 if (($gserver['relay-subscribe'] != $data->subscribe) || ($gserver['relay-scope'] != $data->scope)) {
1410                         $fields = ['relay-subscribe' => $data->subscribe, 'relay-scope' => $data->scope];
1411                         dba::update('gserver', $fields, ['id' => $gserver['id']]);
1412                 }
1413
1414                 dba::delete('gserver-tag', ['gserver-id' => $gserver['id']]);
1415                 if ($data->scope == 'tags') {
1416                         foreach ($data->tags as $tag) {
1417                                 dba::insert('gserver-tag', ['gserver-id' => $gserver['id'], 'tag' => $tag]);
1418                         }
1419                 }
1420         }
1421
1422         /**
1423          * @brief Returns a list of all known servers
1424          * @return array List of server urls
1425          */
1426         public static function serverlist()
1427         {
1428                 $r = q(
1429                         "SELECT `url`, `site_name` AS `displayName`, `network`, `platform`, `version` FROM `gserver`
1430                         WHERE `network` IN ('%s', '%s', '%s') AND `last_contact` > `last_failure`
1431                         ORDER BY `last_contact`
1432                         LIMIT 1000",
1433                         dbesc(NETWORK_DFRN),
1434                         dbesc(NETWORK_DIASPORA),
1435                         dbesc(NETWORK_OSTATUS)
1436                 );
1437
1438                 if (!DBM::is_result($r)) {
1439                         return false;
1440                 }
1441
1442                 return $r;
1443         }
1444
1445         /**
1446          * @brief Fetch server list from remote servers and adds them when they are new.
1447          *
1448          * @param string $poco URL to the POCO endpoint
1449          */
1450         private static function fetchServerlist($poco)
1451         {
1452                 $serverret = Network::curl($poco."/@server");
1453                 if (!$serverret["success"]) {
1454                         return;
1455                 }
1456                 $serverlist = json_decode($serverret['body']);
1457
1458                 if (!is_array($serverlist)) {
1459                         return;
1460                 }
1461
1462                 foreach ($serverlist as $server) {
1463                         $server_url = str_replace("/index.php", "", $server->url);
1464
1465                         $r = q("SELECT `nurl` FROM `gserver` WHERE `nurl` = '%s'", dbesc(normalise_link($server_url)));
1466                         if (!DBM::is_result($r)) {
1467                                 logger("Call server check for server ".$server_url, LOGGER_DEBUG);
1468                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $server_url);
1469                         }
1470                 }
1471         }
1472
1473         private static function discoverFederation()
1474         {
1475                 $last = Config::get('poco', 'last_federation_discovery');
1476
1477                 if ($last) {
1478                         $next = $last + (24 * 60 * 60);
1479                         if ($next > time()) {
1480                                 return;
1481                         }
1482                 }
1483
1484                 // Discover Friendica, Hubzilla and Diaspora servers
1485                 $serverdata = Network::fetchUrl("http://the-federation.info/pods.json");
1486
1487                 if ($serverdata) {
1488                         $servers = json_decode($serverdata);
1489
1490                         foreach ($servers->pods as $server) {
1491                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", "https://".$server->host);
1492                         }
1493                 }
1494
1495                 // Disvover Mastodon servers
1496                 if (!Config::get('system', 'ostatus_disabled')) {
1497                         $accesstoken = Config::get('system', 'instances_social_key');
1498                         if (!empty($accesstoken)) {
1499                                 $api = 'https://instances.social/api/1.0/instances/list?count=0';
1500                                 $header = ['Authorization: Bearer '.$accesstoken];
1501                                 $serverdata = Network::curl($api, false, $redirects, ['headers' => $header]);
1502                                 if ($serverdata['success']) {
1503                                         $servers = json_decode($serverdata['body']);
1504                                         foreach ($servers->instances as $server) {
1505                                                 $url = (is_null($server->https_score) ? 'http' : 'https').'://'.$server->name;
1506                                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "server", $url);
1507                                         }
1508                                 }
1509                         }
1510                 }
1511
1512                 // Currently disabled, since the service isn't available anymore.
1513                 // It is not removed since I hope that there will be a successor.
1514                 // Discover GNU Social Servers.
1515                 //if (!Config::get('system','ostatus_disabled')) {
1516                 //      $serverdata = "http://gstools.org/api/get_open_instances/";
1517
1518                 //      $result = Network::curl($serverdata);
1519                 //      if ($result["success"]) {
1520                 //              $servers = json_decode($result["body"]);
1521
1522                 //              foreach($servers->data as $server)
1523                 //                      self::checkServer($server->instance_address);
1524                 //      }
1525                 //}
1526
1527                 Config::set('poco', 'last_federation_discovery', time());
1528         }
1529
1530         public static function discoverSingleServer($id)
1531         {
1532                 $r = q("SELECT `poco`, `nurl`, `url`, `network` FROM `gserver` WHERE `id` = %d", intval($id));
1533                 if (!DBM::is_result($r)) {
1534                         return false;
1535                 }
1536
1537                 $server = $r[0];
1538
1539                 // Discover new servers out there (Works from Friendica version 3.5.2)
1540                 self::fetchServerlist($server["poco"]);
1541
1542                 // Fetch all users from the other server
1543                 $url = $server["poco"]."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1544
1545                 logger("Fetch all users from the server ".$server["url"], LOGGER_DEBUG);
1546
1547                 $retdata = Network::curl($url);
1548                 if ($retdata["success"]) {
1549                         $data = json_decode($retdata["body"]);
1550
1551                         self::discoverServer($data, 2);
1552
1553                         if (Config::get('system', 'poco_discovery') > 1) {
1554                                 $timeframe = Config::get('system', 'poco_discovery_since');
1555                                 if ($timeframe == 0) {
1556                                         $timeframe = 30;
1557                                 }
1558
1559                                 $updatedSince = date(DateTimeFormat::MYSQL, time() - $timeframe * 86400);
1560
1561                                 // Fetch all global contacts from the other server (Not working with Redmatrix and Friendica versions before 3.3)
1562                                 $url = $server["poco"]."/@global?updatedSince=".$updatedSince."&fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1563
1564                                 $success = false;
1565
1566                                 $retdata = Network::curl($url);
1567                                 if ($retdata["success"]) {
1568                                         logger("Fetch all global contacts from the server ".$server["nurl"], LOGGER_DEBUG);
1569                                         $success = self::discoverServer(json_decode($retdata["body"]));
1570                                 }
1571
1572                                 if (!$success && (Config::get('system', 'poco_discovery') > 2)) {
1573                                         logger("Fetch contacts from users of the server ".$server["nurl"], LOGGER_DEBUG);
1574                                         self::discoverServerUsers($data, $server);
1575                                 }
1576                         }
1577
1578                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1579                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1580
1581                         return true;
1582                 } else {
1583                         // If the server hadn't replied correctly, then force a sanity check
1584                         self::checkServer($server["url"], $server["network"], true);
1585
1586                         // If we couldn't reach the server, we will try it some time later
1587                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1588                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1589
1590                         return false;
1591                 }
1592         }
1593
1594         public static function discover($complete = false)
1595         {
1596                 // Update the server list
1597                 self::discoverFederation();
1598
1599                 $no_of_queries = 5;
1600
1601                 $requery_days = intval(Config::get("system", "poco_requery_days"));
1602
1603                 if ($requery_days == 0) {
1604                         $requery_days = 7;
1605                 }
1606                 $last_update = date("c", time() - (60 * 60 * 24 * $requery_days));
1607
1608                 $r = q("SELECT `id`, `url`, `network` FROM `gserver` WHERE `last_contact` >= `last_failure` AND `poco` != '' AND `last_poco_query` < '%s' ORDER BY RAND()", dbesc($last_update));
1609                 if (DBM::is_result($r)) {
1610                         foreach ($r as $server) {
1611                                 if (!self::checkServer($server["url"], $server["network"])) {
1612                                         // The server is not reachable? Okay, then we will try it later
1613                                         $fields = ['last_poco_query' => DateTimeFormat::utcNow()];
1614                                         dba::update('gserver', $fields, ['nurl' => $server["nurl"]]);
1615                                         continue;
1616                                 }
1617
1618                                 logger('Update directory from server '.$server['url'].' with ID '.$server['id'], LOGGER_DEBUG);
1619                                 Worker::add(PRIORITY_LOW, "DiscoverPoCo", "update_server_directory", (int)$server['id']);
1620
1621                                 if (!$complete && (--$no_of_queries == 0)) {
1622                                         break;
1623                                 }
1624                         }
1625                 }
1626         }
1627
1628         private static function discoverServerUsers($data, $server)
1629         {
1630                 if (!isset($data->entry)) {
1631                         return;
1632                 }
1633
1634                 foreach ($data->entry as $entry) {
1635                         $username = "";
1636                         if (isset($entry->urls)) {
1637                                 foreach ($entry->urls as $url) {
1638                                         if ($url->type == 'profile') {
1639                                                 $profile_url = $url->value;
1640                                                 $urlparts = parse_url($profile_url);
1641                                                 $username = end(explode("/", $urlparts["path"]));
1642                                         }
1643                                 }
1644                         }
1645                         if ($username != "") {
1646                                 logger("Fetch contacts for the user ".$username." from the server ".$server["nurl"], LOGGER_DEBUG);
1647
1648                                 // Fetch all contacts from a given user from the other server
1649                                 $url = $server["poco"]."/".$username."/?fields=displayName,urls,photos,updated,network,aboutMe,currentLocation,tags,gender,contactType,generation";
1650
1651                                 $retdata = Network::curl($url);
1652                                 if ($retdata["success"]) {
1653                                         self::discoverServer(json_decode($retdata["body"]), 3);
1654                                 }
1655                         }
1656                 }
1657         }
1658
1659         private static function discoverServer($data, $default_generation = 0)
1660         {
1661                 if (!isset($data->entry) || !count($data->entry)) {
1662                         return false;
1663                 }
1664
1665                 $success = false;
1666
1667                 foreach ($data->entry as $entry) {
1668                         $profile_url = '';
1669                         $profile_photo = '';
1670                         $connect_url = '';
1671                         $name = '';
1672                         $network = '';
1673                         $updated = NULL_DATE;
1674                         $location = '';
1675                         $about = '';
1676                         $keywords = '';
1677                         $gender = '';
1678                         $contact_type = -1;
1679                         $generation = $default_generation;
1680
1681                         $name = $entry->displayName;
1682
1683                         if (isset($entry->urls)) {
1684                                 foreach ($entry->urls as $url) {
1685                                         if ($url->type == 'profile') {
1686                                                 $profile_url = $url->value;
1687                                                 continue;
1688                                         }
1689                                         if ($url->type == 'webfinger') {
1690                                                 $connect_url = str_replace('acct:' , '', $url->value);
1691                                                 continue;
1692                                         }
1693                                 }
1694                         }
1695
1696                         if (isset($entry->photos)) {
1697                                 foreach ($entry->photos as $photo) {
1698                                         if ($photo->type == 'profile') {
1699                                                 $profile_photo = $photo->value;
1700                                                 continue;
1701                                         }
1702                                 }
1703                         }
1704
1705                         if (isset($entry->updated)) {
1706                                 $updated = date(DateTimeFormat::MYSQL, strtotime($entry->updated));
1707                         }
1708
1709                         if (isset($entry->network)) {
1710                                 $network = $entry->network;
1711                         }
1712
1713                         if (isset($entry->currentLocation)) {
1714                                 $location = $entry->currentLocation;
1715                         }
1716
1717                         if (isset($entry->aboutMe)) {
1718                                 $about = HTML::toBBCode($entry->aboutMe);
1719                         }
1720
1721                         if (isset($entry->gender)) {
1722                                 $gender = $entry->gender;
1723                         }
1724
1725                         if (isset($entry->generation) && ($entry->generation > 0)) {
1726                                 $generation = ++$entry->generation;
1727                         }
1728
1729                         if (isset($entry->contactType) && ($entry->contactType >= 0)) {
1730                                 $contact_type = $entry->contactType;
1731                         }
1732
1733                         if (isset($entry->tags)) {
1734                                 foreach ($entry->tags as $tag) {
1735                                         $keywords = implode(", ", $tag);
1736                                 }
1737                         }
1738
1739                         if ($generation > 0) {
1740                                 $success = true;
1741
1742                                 logger("Store profile ".$profile_url, LOGGER_DEBUG);
1743
1744                                 $gcontact = ["url" => $profile_url,
1745                                                 "name" => $name,
1746                                                 "network" => $network,
1747                                                 "photo" => $profile_photo,
1748                                                 "about" => $about,
1749                                                 "location" => $location,
1750                                                 "gender" => $gender,
1751                                                 "keywords" => $keywords,
1752                                                 "connect" => $connect_url,
1753                                                 "updated" => $updated,
1754                                                 "contact-type" => $contact_type,
1755                                                 "generation" => $generation];
1756
1757                                 try {
1758                                         $gcontact = GContact::sanitize($gcontact);
1759                                         GContact::update($gcontact);
1760                                 } catch (Exception $e) {
1761                                         logger($e->getMessage(), LOGGER_DEBUG);
1762                                 }
1763
1764                                 logger("Done for profile ".$profile_url, LOGGER_DEBUG);
1765                         }
1766                 }
1767                 return $success;
1768         }
1769
1770 }