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