src/Network/Probe.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Network;
  23
  24 use DOMDocument;
  25 use DomXPath;
  26 use Friendica\Core\Cache\Duration;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\System;
  30 use Friendica\Database\DBA;
  31 use Friendica\DI;
  32 use Friendica\Model\Contact;
  33 use Friendica\Model\Profile;
  34 use Friendica\Protocol\ActivityNamespace;
  35 use Friendica\Protocol\ActivityPub;
  36 use Friendica\Protocol\Email;
  37 use Friendica\Protocol\Feed;
  38 use Friendica\Util\Crypto;
  39 use Friendica\Util\Network;
  40 use Friendica\Util\Strings;
  41 use Friendica\Util\XML;
  42
  43 /**
  44  * This class contain functions for probing URL
  45  */
  46 class Probe
  47 {
  48         private static $baseurl;
  49         private static $istimeout;
  50
  51         /**
  52          * Remove stuff from an URI that doesn't belong there
  53          *
  54          * @param string $URI
  55          * @return string Cleaned URI
  56          */
  57         public static function cleanURI(string $URI)
  58         {
  59                 // At first remove leading and trailing junk
  60                 $URI = trim($URI, "@#?:/ \t\n\r\0\x0B");
  61
  62                 $parts = parse_url($URI);
  63
  64                 if (empty($parts['scheme'])) {
  65                         return $URI;
  66                 }
  67
  68                 // Remove the URL fragment, since these shouldn't be part of any profile URL
  69                 unset($parts['fragment']);
  70
  71                 $URI = Network::unparseURL($parts);
  72
  73                 return $URI;
  74         }
  75
  76         /**
  77          * Rearrange the array so that it always has the same order
  78          *
  79          * @param array $data Unordered data
  80          *
  81          * @return array Ordered data
  82          */
  83         private static function rearrangeData($data)
  84         {
  85                 $fields = ["name", "nick", "guid", "url", "addr", "alias", "photo", "account-type",
  86                                 "community", "keywords", "location", "about", "hide",
  87                                 "batch", "notify", "poll", "request", "confirm", "poco",
  88                                 "following", "followers", "inbox", "outbox", "sharedinbox",
  89                                 "priority", "network", "pubkey", "baseurl"];
  90
  91                 $newdata = [];
  92                 foreach ($fields as $field) {
  93                         if (isset($data[$field])) {
  94                                 $newdata[$field] = $data[$field];
  95                         } else {
  96                                 $newdata[$field] = "";
  97                         }
  98                 }
  99
 100                 // We don't use the "priority" field anymore and replace it with a dummy.
 101                 $newdata["priority"] = 0;
 102
 103                 return $newdata;
 104         }
 105
 106         /**
 107          * Check if the hostname belongs to the own server
 108          *
 109          * @param string $host The hostname that is to be checked
 110          *
 111          * @return bool Does the testes hostname belongs to the own server?
 112          */
 113         private static function ownHost($host)
 114         {
 115                 $own_host = DI::baseUrl()->getHostname();
 116
 117                 $parts = parse_url($host);
 118
 119                 if (!isset($parts['scheme'])) {
 120                         $parts = parse_url('http://'.$host);
 121                 }
 122
 123                 if (!isset($parts['host'])) {
 124                         return false;
 125                 }
 126                 return $parts['host'] == $own_host;
 127         }
 128
 129         /**
 130          * Probes for webfinger path via "host-meta"
 131          *
 132          * We have to check if the servers in the future still will offer this.
 133          * It seems as if it was dropped from the standard.
 134          *
 135          * @param string $host The host part of an url
 136          *
 137          * @return array with template and type of the webfinger template for JSON or XML
 138          * @throws HTTPException\InternalServerErrorException
 139          */
 140         private static function hostMeta($host)
 141         {
 142                 // Reset the static variable
 143                 self::$baseurl = '';
 144
 145                 // Handles the case when the hostname contains the scheme
 146                 if (!parse_url($host, PHP_URL_SCHEME)) {
 147                         $ssl_url = "https://" . $host . "/.well-known/host-meta";
 148                         $url = "http://" . $host . "/.well-known/host-meta";
 149                 } else {
 150                         $ssl_url = $host . "/.well-known/host-meta";
 151                         $url = '';
 152                 }
 153
 154                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 155
 156                 Logger::info('Probing', ['host' => $host, 'ssl_url' => $ssl_url, 'url' => $url, 'callstack' => System::callstack(20)]);
 157                 $xrd = null;
 158
 159                 $curlResult = Network::curl($ssl_url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 160                 $ssl_connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 161                 if ($curlResult->isSuccess()) {
 162                         $xml = $curlResult->getBody();
 163                         $xrd = XML::parseString($xml, true);
 164                         if (!empty($url)) {
 165                                 $host_url = 'https://' . $host;
 166                         } else {
 167                                 $host_url = $host;
 168                         }
 169                 } elseif ($curlResult->isTimeout()) {
 170                         Logger::info('Probing timeout', ['url' => $ssl_url], Logger::DEBUG);
 171                         self::$istimeout = true;
 172                         return false;
 173                 }
 174
 175                 if (!is_object($xrd) && !empty($url)) {
 176                         $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 177                         $connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 178                         if ($curlResult->isTimeout()) {
 179                                 Logger::info('Probing timeout', ['url' => $url], Logger::DEBUG);
 180                                 self::$istimeout = true;
 181                                 return false;
 182                         } elseif ($connection_error && $ssl_connection_error) {
 183                                 self::$istimeout = true;
 184                                 return false;
 185                         }
 186
 187                         $xml = $curlResult->getBody();
 188                         $xrd = XML::parseString($xml, true);
 189                         $host_url = 'http://'.$host;
 190                 }
 191                 if (!is_object($xrd)) {
 192                         Logger::log("No xrd object found for ".$host, Logger::DEBUG);
 193                         return [];
 194                 }
 195
 196                 $links = XML::elementToArray($xrd);
 197                 if (!isset($links["xrd"]["link"])) {
 198                         Logger::log("No xrd data found for ".$host, Logger::DEBUG);
 199                         return [];
 200                 }
 201
 202                 $lrdd = ['application/jrd+json' => $host_url . '/.well-known/webfinger?resource={uri}'];
 203
 204                 foreach ($links["xrd"]["link"] as $value => $link) {
 205                         if (!empty($link["@attributes"])) {
 206                                 $attributes = $link["@attributes"];
 207                         } elseif ($value == "@attributes") {
 208                                 $attributes = $link;
 209                         } else {
 210                                 continue;
 211                         }
 212
 213                         if (!empty($attributes["rel"]) && $attributes["rel"] == "lrdd" && !empty($attributes["template"])) {
 214                                 $type = (empty($attributes["type"]) ? '' : $attributes["type"]);
 215
 216                                 $lrdd[$type] = $attributes["template"];
 217                         }
 218                 }
 219
 220                 self::$baseurl = $host_url;
 221
 222                 Logger::log("Probing successful for ".$host, Logger::DEBUG);
 223
 224                 return $lrdd;
 225         }
 226
 227         /**
 228          * Perform Webfinger lookup and return DFRN data
 229          *
 230          * Given an email style address, perform webfinger lookup and
 231          * return the resulting DFRN profile URL, or if no DFRN profile URL
 232          * is located, returns an OStatus subscription template (prefixed
 233          * with the string 'stat:' to identify it as on OStatus template).
 234          * If this isn't an email style address just return $webbie.
 235          * Return an empty string if email-style addresses but webfinger fails,
 236          * or if the resultant personal XRD doesn't contain a supported
 237          * subscription/friend-request attribute.
 238          *
 239          * amended 7/9/2011 to return an hcard which could save potentially loading
 240          * a lengthy content page to scrape dfrn attributes
 241          *
 242          * @param string $webbie    Address that should be probed
 243          * @param string $hcard_url Link to the hcard - is returned by reference
 244          *
 245          * @return string profile link
 246          * @throws HTTPException\InternalServerErrorException
 247          */
 248         public static function webfingerDfrn($webbie, &$hcard_url)
 249         {
 250                 $profile_link = '';
 251
 252                 $links = self::lrdd($webbie);
 253                 Logger::log('webfingerDfrn: '.$webbie.':'.print_r($links, true), Logger::DATA);
 254                 if (!empty($links) && is_array($links)) {
 255                         foreach ($links as $link) {
 256                                 if ($link['@attributes']['rel'] === ActivityNamespace::DFRN) {
 257                                         $profile_link = $link['@attributes']['href'];
 258                                 }
 259                                 if (($link['@attributes']['rel'] === ActivityNamespace::OSTATUSSUB) && ($profile_link == "")) {
 260                                         $profile_link = 'stat:'.$link['@attributes']['template'];
 261                                 }
 262                                 if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
 263                                         $hcard_url = $link['@attributes']['href'];
 264                                 }
 265                         }
 266                 }
 267                 return $profile_link;
 268         }
 269
 270         /**
 271          * Get the link for the remote follow page for a given profile link
 272          *
 273          * @param sting $profile
 274          * @return string Remote follow page link
 275          */
 276         public static function getRemoteFollowLink(string $profile)
 277         {
 278                 $follow_link = '';
 279
 280                 $links = self::lrdd($profile);
 281
 282                 if (!empty($links) && is_array($links)) {
 283                         foreach ($links as $link) {
 284                                 if ($link['@attributes']['rel'] === ActivityNamespace::OSTATUSSUB) {
 285                                         $follow_link = $link['@attributes']['template'];
 286                                 }
 287                         }
 288                 }
 289                 return $follow_link;
 290         }
 291
 292         /**
 293          * Check an URI for LRDD data
 294          *
 295          * @param string $uri Address that should be probed
 296          *
 297          * @return array uri data
 298          * @throws HTTPException\InternalServerErrorException
 299          */
 300         public static function lrdd($uri)
 301         {
 302                 $lrdd = self::hostMeta($uri);
 303                 $webfinger = null;
 304
 305                 if (is_bool($lrdd)) {
 306                         return [];
 307                 }
 308
 309                 if (!$lrdd) {
 310                         $parts = @parse_url($uri);
 311                         if (!$parts || empty($parts["host"]) || empty($parts["path"])) {
 312                                 return [];
 313                         }
 314
 315                         $host = $parts['scheme'] . '://' . $parts["host"];
 316                         if (!empty($parts["port"])) {
 317                                 $host .= ':'.$parts["port"];
 318                         }
 319
 320                         $path_parts = explode("/", trim($parts["path"], "/"));
 321
 322                         $nick = array_pop($path_parts);
 323
 324                         do {
 325                                 $lrdd = self::hostMeta($host);
 326                                 $host .= "/".array_shift($path_parts);
 327                         } while (!$lrdd && (sizeof($path_parts) > 0));
 328                 }
 329
 330                 if (!$lrdd) {
 331                         Logger::log("No lrdd data found for ".$uri, Logger::DEBUG);
 332                         return [];
 333                 }
 334
 335                 foreach ($lrdd as $type => $template) {
 336                         if ($webfinger) {
 337                                 continue;
 338                         }
 339
 340                         $path = str_replace('{uri}', urlencode($uri), $template);
 341                         $webfinger = self::webfinger($path, $type);
 342
 343                         if (!$webfinger && (strstr($uri, "@"))) {
 344                                 $path = str_replace('{uri}', urlencode("acct:".$uri), $template);
 345                                 $webfinger = self::webfinger($path, $type);
 346                         }
 347
 348                         // Special treatment for Mastodon
 349                         // Problem is that Mastodon uses an URL format like http://domain.tld/@nick
 350                         // But the webfinger for this format fails.
 351                         if (!$webfinger && !empty($nick)) {
 352                                 // Mastodon uses a "@" as prefix for usernames in their url format
 353                                 $nick = ltrim($nick, '@');
 354
 355                                 $addr = $nick."@".$host;
 356
 357                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 358                                 $webfinger = self::webfinger($path, $type);
 359                         }
 360                 }
 361
 362                 if (!is_array($webfinger["links"])) {
 363                         Logger::log("No webfinger links found for ".$uri, Logger::DEBUG);
 364                         return false;
 365                 }
 366
 367                 $data = [];
 368
 369                 foreach ($webfinger["links"] as $link) {
 370                         $data[] = ["@attributes" => $link];
 371                 }
 372
 373                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 374                         foreach ($webfinger["aliases"] as $alias) {
 375                                 $data[] = ["@attributes" =>
 376                                                         ["rel" => "alias",
 377                                                                 "href" => $alias]];
 378                         }
 379                 }
 380
 381                 return $data;
 382         }
 383
 384         /**
 385          * Fetch information (protocol endpoints and user information) about a given uri
 386          *
 387          * @param string  $uri     Address that should be probed
 388          * @param string  $network Test for this specific network
 389          * @param integer $uid     User ID for the probe (only used for mails)
 390          * @param boolean $cache   Use cached values?
 391          *
 392          * @return array uri data
 393          * @throws HTTPException\InternalServerErrorException
 394          * @throws \ImagickException
 395          */
 396         public static function uri($uri, $network = '', $uid = -1, $cache = true)
 397         {
 398                 if ($cache) {
 399                         $result = DI::cache()->get('Probe::uri:' . $network . ':' . $uri);
 400                         if (!is_null($result)) {
 401                                 return $result;
 402                         }
 403                 }
 404
 405                 if ($uid == -1) {
 406                         $uid = local_user();
 407                 }
 408
 409                 self::$istimeout = false;
 410
 411                 if ($network != Protocol::ACTIVITYPUB) {
 412                         $data = self::detect($uri, $network, $uid);
 413                 } else {
 414                         $data = null;
 415                 }
 416
 417                 // When the previous detection process had got a time out
 418                 // we could falsely detect a Friendica profile as AP profile.
 419                 if (!self::$istimeout) {
 420                         $ap_profile = ActivityPub::probeProfile($uri);
 421
 422                         if (empty($data) || (!empty($ap_profile) && empty($network) && (($data['network'] ?? '') != Protocol::DFRN))) {
 423                                 $data = $ap_profile;
 424                         } elseif (!empty($ap_profile)) {
 425                                 $ap_profile['batch'] = '';
 426                                 $data = array_merge($ap_profile, $data);
 427                         }
 428                 } else {
 429                         Logger::notice('Time out detected. AP will not be probed.', ['uri' => $uri]);
 430                 }
 431
 432                 if (!isset($data['url'])) {
 433                         $data['url'] = $uri;
 434                 }
 435
 436                 if (!empty($data['photo']) && !empty($data['baseurl'])) {
 437                         $data['baseurl'] = Network::getUrlMatch(Strings::normaliseLink($data['baseurl']), Strings::normaliseLink($data['photo']));
 438                 } elseif (empty($data['photo'])) {
 439                         $data['photo'] = DI::baseUrl() . '/images/person-300.jpg';
 440                 }
 441
 442                 if (empty($data['name'])) {
 443                         if (!empty($data['nick'])) {
 444                                 $data['name'] = $data['nick'];
 445                         }
 446
 447                         if (empty($data['name'])) {
 448                                 $data['name'] = $data['url'];
 449                         }
 450                 }
 451
 452                 if (empty($data['nick'])) {
 453                         $data['nick'] = strtolower($data['name']);
 454
 455                         if (strpos($data['nick'], ' ')) {
 456                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 457                         }
 458                 }
 459
 460                 if (!empty(self::$baseurl)) {
 461                         $data['baseurl'] = self::$baseurl;
 462                 }
 463
 464                 if (empty($data['network'])) {
 465                         $data['network'] = Protocol::PHANTOM;
 466                 }
 467
 468                 // Ensure that local connections always are DFRN
 469                 if (($network == '') && ($data['network'] != Protocol::PHANTOM) && (self::ownHost($data['baseurl'] ?? '') || self::ownHost($data['url']))) {
 470                         $data['network'] = Protocol::DFRN;
 471                 }
 472
 473                 if (!isset($data['hide']) && in_array($data['network'], Protocol::FEDERATED)) {
 474                         $data['hide'] = self::getHideStatus($data['url']);
 475                 }
 476
 477                 $data = self::rearrangeData($data);
 478
 479                 // Only store into the cache if the value seems to be valid
 480                 if (!in_array($data['network'], [Protocol::PHANTOM, Protocol::MAIL])) {
 481                         DI::cache()->set('Probe::uri:' . $network . ':' . $uri, $data, Duration::DAY);
 482                 }
 483
 484                 return $data;
 485         }
 486
 487
 488         /**
 489          * Fetches the "hide" status from the profile
 490          *
 491          * @param string $url URL of the profile
 492          *
 493          * @return boolean "hide" status
 494          */
 495         private static function getHideStatus($url)
 496         {
 497                 $curlResult = Network::curl($url);
 498                 if (!$curlResult->isSuccess()) {
 499                         return false;
 500                 }
 501
 502                 // If the file is too large then exit
 503                 if (($curlResult->getInfo()['download_content_length'] ?? 0) > 1000000) {
 504                         return false;
 505                 }
 506
 507                 // If it isn't a HTML file then exit
 508                 if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
 509                         return false;
 510                 }
 511
 512                 $body = $curlResult->getBody();
 513
 514                 $doc = new DOMDocument();
 515                 @$doc->loadHTML($body);
 516
 517                 $xpath = new DOMXPath($doc);
 518
 519                 $list = $xpath->query('//meta[@name]');
 520                 foreach ($list as $node) {
 521                         $meta_tag = [];
 522                         if ($node->attributes->length) {
 523                                 foreach ($node->attributes as $attribute) {
 524                                         $meta_tag[$attribute->name] = $attribute->value;
 525                                 }
 526                         }
 527
 528                         if (empty($meta_tag['content'])) {
 529                                 continue;
 530                         }
 531
 532                         $content = strtolower(trim($meta_tag['content']));
 533
 534                         switch (strtolower(trim($meta_tag['name']))) {
 535                                 case 'dfrn-global-visibility':
 536                                         if ($content == 'false') {
 537                                                 return true;
 538                                         }
 539                                         break;
 540                                 case 'robots':
 541                                         if (strpos($content, 'noindex') !== false) {
 542                                                 return true;
 543                                         }
 544                                         break;
 545                         }
 546                 }
 547
 548                 return false;
 549         }
 550
 551         /**
 552          * Checks if a profile url should be OStatus but only provides partial information
 553          *
 554          * @param array  $webfinger Webfinger data
 555          * @param string $lrdd      Path template for webfinger request
 556          * @param string $type      type
 557          *
 558          * @return array fixed webfinger data
 559          * @throws HTTPException\InternalServerErrorException
 560          */
 561         private static function fixOStatus($webfinger, $lrdd, $type)
 562         {
 563                 if (empty($webfinger['links']) || empty($webfinger['subject'])) {
 564                         return $webfinger;
 565                 }
 566
 567                 $is_ostatus = false;
 568                 $has_key = false;
 569
 570                 foreach ($webfinger['links'] as $link) {
 571                         if ($link['rel'] == ActivityNamespace::OSTATUSSUB) {
 572                                 $is_ostatus = true;
 573                         }
 574                         if ($link['rel'] == 'magic-public-key') {
 575                                 $has_key = true;
 576                         }
 577                 }
 578
 579                 if (!$is_ostatus || $has_key) {
 580                         return $webfinger;
 581                 }
 582
 583                 $url = Network::switchScheme($webfinger['subject']);
 584                 $path = str_replace('{uri}', urlencode($url), $lrdd);
 585                 $webfinger2 = self::webfinger($path, $type);
 586
 587                 // Is the new webfinger detectable as OStatus?
 588                 if (self::ostatus($webfinger2, true)) {
 589                         $webfinger = $webfinger2;
 590                 }
 591
 592                 return $webfinger;
 593         }
 594
 595         /**
 596          * Fetch information (protocol endpoints and user information) about a given uri
 597          *
 598          * This function is only called by the "uri" function that adds caching and rearranging of data.
 599          *
 600          * @param string  $uri     Address that should be probed
 601          * @param string  $network Test for this specific network
 602          * @param integer $uid     User ID for the probe (only used for mails)
 603          *
 604          * @return array uri data
 605          * @throws HTTPException\InternalServerErrorException
 606          */
 607         private static function detect($uri, $network, $uid)
 608         {
 609                 $parts = parse_url($uri);
 610
 611                 if (!empty($parts["scheme"]) && !empty($parts["host"])) {
 612                         $host = $parts["host"];
 613                         if (!empty($parts["port"])) {
 614                                 $host .= ':'.$parts["port"];
 615                         }
 616
 617                         if ($host == 'twitter.com') {
 618                                 return self::twitter($uri);
 619                         }
 620                         $lrdd = self::hostMeta($host);
 621
 622                         if (is_bool($lrdd)) {
 623                                 return [];
 624                         }
 625
 626                         $path_parts = explode("/", trim($parts['path'] ?? '', "/"));
 627
 628                         while (!$lrdd && (sizeof($path_parts) > 1)) {
 629                                 $host .= "/".array_shift($path_parts);
 630                                 $lrdd = self::hostMeta($host);
 631                         }
 632                         if (!$lrdd) {
 633                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 634                                 return self::feed($uri);
 635                         }
 636                         $nick = array_pop($path_parts);
 637
 638                         // Mastodon uses a "@" as prefix for usernames in their url format
 639                         $nick = ltrim($nick, '@');
 640
 641                         $addr = $nick."@".$host;
 642                 } elseif (strstr($uri, '@')) {
 643                         // If the URI starts with "mailto:" then jump directly to the mail detection
 644                         if (strpos($uri, 'mailto:') !== false) {
 645                                 $uri = str_replace('mailto:', '', $uri);
 646                                 return self::mail($uri, $uid);
 647                         }
 648
 649                         if ($network == Protocol::MAIL) {
 650                                 return self::mail($uri, $uid);
 651                         }
 652                         // Remove "acct:" from the URI
 653                         $uri = str_replace('acct:', '', $uri);
 654
 655                         $host = substr($uri, strpos($uri, '@') + 1);
 656                         $nick = substr($uri, 0, strpos($uri, '@'));
 657
 658                         if (strpos($uri, '@twitter.com')) {
 659                                 return self::twitter($uri);
 660                         }
 661                         $lrdd = self::hostMeta($host);
 662
 663                         if (is_bool($lrdd)) {
 664                                 return [];
 665                         }
 666
 667                         if (!$lrdd) {
 668                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 669                                 return self::mail($uri, $uid);
 670                         }
 671                         $addr = $uri;
 672                 } else {
 673                         Logger::log("Uri ".$uri." was not detectable", Logger::DEBUG);
 674                         return false;
 675                 }
 676
 677                 $webfinger = false;
 678
 679                 /// @todo Do we need the prefix "acct:" or "acct://"?
 680
 681                 foreach ($lrdd as $type => $template) {
 682                         if ($webfinger) {
 683                                 continue;
 684                         }
 685
 686                         // At first try it with the given uri
 687                         $path = str_replace('{uri}', urlencode($uri), $template);
 688                         $webfinger = self::webfinger($path, $type);
 689
 690                         // Fix possible problems with GNU Social probing to wrong scheme
 691                         $webfinger = self::fixOStatus($webfinger, $template, $type);
 692
 693                         // We cannot be sure that the detected address was correct, so we don't use the values
 694                         if ($webfinger && ($uri != $addr)) {
 695                                 $nick = "";
 696                                 $addr = "";
 697                         }
 698
 699                         // Try webfinger with the address (user@domain.tld)
 700                         if (!$webfinger) {
 701                                 $path = str_replace('{uri}', urlencode($addr), $template);
 702                                 $webfinger = self::webfinger($path, $type);
 703                         }
 704
 705                         // Mastodon needs to have it with "acct:"
 706                         if (!$webfinger) {
 707                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 708                                 $webfinger = self::webfinger($path, $type);
 709                         }
 710                 }
 711
 712                 if (!$webfinger) {
 713                         return self::feed($uri);
 714                 }
 715
 716                 $result = false;
 717
 718                 Logger::log("Probing ".$uri, Logger::DEBUG);
 719
 720                 if (in_array($network, ["", Protocol::DFRN])) {
 721                         $result = self::dfrn($webfinger);
 722                 }
 723                 if ((!$result && ($network == "")) || ($network == Protocol::DIASPORA)) {
 724                         $result = self::diaspora($webfinger);
 725                 }
 726                 if ((!$result && ($network == "")) || ($network == Protocol::OSTATUS)) {
 727                         $result = self::ostatus($webfinger);
 728                 }
 729                 if (in_array($network, ['', Protocol::ZOT])) {
 730                         $result = self::zot($webfinger, $result);
 731                 }
 732                 if ((!$result && ($network == "")) || ($network == Protocol::PUMPIO)) {
 733                         $result = self::pumpio($webfinger, $addr);
 734                 }
 735                 if ((!$result && ($network == "")) || ($network == Protocol::FEED)) {
 736                         $result = self::feed($uri);
 737                 } else {
 738                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 739                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 740                         if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
 741                                 $result["nick"] = $nick;
 742                         }
 743
 744                         if (empty($result["addr"]) && ($addr != "")) {
 745                                 $result["addr"] = $addr;
 746                         }
 747                 }
 748
 749                 if (empty($result["network"])) {
 750                         $result["network"] = Protocol::PHANTOM;
 751                 }
 752
 753                 if (empty($result["url"])) {
 754                         $result["url"] = $uri;
 755                 }
 756
 757                 Logger::log($uri." is ".$result["network"], Logger::DEBUG);
 758
 759                 if (empty($result["baseurl"]) && ($result["network"] != Protocol::PHANTOM)) {
 760                         $pos = strpos($result["url"], $host);
 761                         if ($pos) {
 762                                 $result["baseurl"] = substr($result["url"], 0, $pos).$host;
 763                         }
 764                 }
 765                 return $result;
 766         }
 767
 768         /**
 769          * Check for Zot contact
 770          *
 771          * @param array $webfinger Webfinger data
 772          * @param array $data      previously probed data
 773          *
 774          * @return array Zot data
 775          * @throws HTTPException\InternalServerErrorException
 776          */
 777         private static function zot($webfinger, $data)
 778         {
 779                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 780                         foreach ($webfinger["aliases"] as $alias) {
 781                                 if (substr($alias, 0, 5) == 'acct:') {
 782                                         $data["addr"] = substr($alias, 5);
 783                                 }
 784                         }
 785                 }
 786
 787                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
 788                         $data["addr"] = substr($webfinger["subject"], 5);
 789                 }
 790
 791                 $zot_url = '';
 792                 foreach ($webfinger['links'] as $link) {
 793                         if (($link['rel'] == 'http://purl.org/zot/protocol') && !empty($link['href'])) {
 794                                 $zot_url = $link['href'];
 795                         }
 796                 }
 797
 798                 if (empty($zot_url) && !empty($data['addr']) && !empty(self::$baseurl)) {
 799                         $condition = ['nurl' => Strings::normaliseLink(self::$baseurl), 'platform' => ['hubzilla']];
 800                         if (!DBA::exists('gserver', $condition)) {
 801                                 return $data;
 802                         }
 803                         $zot_url = self::$baseurl . '/.well-known/zot-info?address=' . $data['addr'];
 804                 }
 805
 806                 if (empty($zot_url)) {
 807                         return $data;
 808                 }
 809
 810                 $data = self::pollZot($zot_url, $data);
 811
 812                 if (!empty($data['url']) && !empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
 813                         foreach ($webfinger['aliases'] as $alias) {
 814                                 if (!strstr($alias, '@') && Strings::normaliseLink($alias) != Strings::normaliseLink($data['url'])) {
 815                                         $data['alias'] = $alias;
 816                                 }
 817                         }
 818                 }
 819
 820                 return $data;
 821         }
 822
 823         public static function pollZot($url, $data)
 824         {
 825                 $curlResult = Network::curl($url);
 826                 if ($curlResult->isTimeout()) {
 827                         return $data;
 828                 }
 829                 $content = $curlResult->getBody();
 830                 if (!$content) {
 831                         return $data;
 832                 }
 833
 834                 $json = json_decode($content, true);
 835                 if (!is_array($json)) {
 836                         return $data;
 837                 }
 838
 839                 if (empty($data['network'])) {
 840                         if (!empty($json['protocols']) && in_array('zot', $json['protocols'])) {
 841                                 $data['network'] = Protocol::ZOT;
 842                         } elseif (!isset($json['protocols'])) {
 843                                 $data['network'] = Protocol::ZOT;
 844                         }
 845                 }
 846
 847                 if (!empty($json['guid']) && empty($data['guid'])) {
 848                         $data['guid'] = $json['guid'];
 849                 }
 850                 if (!empty($json['key']) && empty($data['pubkey'])) {
 851                         $data['pubkey'] = $json['key'];
 852                 }
 853                 if (!empty($json['name'])) {
 854                         $data['name'] = $json['name'];
 855                 }
 856                 if (!empty($json['photo'])) {
 857                         $data['photo'] = $json['photo'];
 858                         if (!empty($json['photo_updated'])) {
 859                                 $data['photo'] .= '?rev=' . urlencode($json['photo_updated']);
 860                         }
 861                 }
 862                 if (!empty($json['address'])) {
 863                         $data['addr'] = $json['address'];
 864                 }
 865                 if (!empty($json['url'])) {
 866                         $data['url'] = $json['url'];
 867                 }
 868                 if (!empty($json['connections_url'])) {
 869                         $data['poco'] = $json['connections_url'];
 870                 }
 871                 if (isset($json['searchable'])) {
 872                         $data['hide'] = !$json['searchable'];
 873                 }
 874                 if (!empty($json['public_forum'])) {
 875                         $data['community'] = $json['public_forum'];
 876                         $data['account-type'] = Contact::PAGE_COMMUNITY;
 877                 }
 878
 879                 if (!empty($json['profile'])) {
 880                         $profile = $json['profile'];
 881                         if (!empty($profile['description'])) {
 882                                 $data['about'] = $profile['description'];
 883                         }
 884                         if (!empty($profile['keywords'])) {
 885                                 $keywords = implode(', ', $profile['keywords']);
 886                                 if (!empty($keywords)) {
 887                                         $data['keywords'] = $keywords;
 888                                 }
 889                         }
 890
 891                         $loc = [];
 892                         if (!empty($profile['region'])) {
 893                                 $loc['region'] = $profile['region'];
 894                         }
 895                         if (!empty($profile['country'])) {
 896                                 $loc['country-name'] = $profile['country'];
 897                         }
 898                         $location = Profile::formatLocation($loc);
 899                         if (!empty($location)) {
 900                                 $data['location'] = $location;
 901                         }
 902                 }
 903
 904                 return $data;
 905         }
 906
 907         /**
 908          * Perform a webfinger request.
 909          *
 910          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 911          *
 912          * @param string $url  Address that should be probed
 913          * @param string $type type
 914          *
 915          * @return array webfinger data
 916          * @throws HTTPException\InternalServerErrorException
 917          */
 918         private static function webfinger($url, $type)
 919         {
 920                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 921
 922                 $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout, 'accept_content' => $type]);
 923                 if ($curlResult->isTimeout()) {
 924                         self::$istimeout = true;
 925                         return false;
 926                 }
 927                 $data = $curlResult->getBody();
 928
 929                 $webfinger = json_decode($data, true);
 930                 if (is_array($webfinger)) {
 931                         if (!isset($webfinger["links"])) {
 932                                 Logger::log("No json webfinger links for ".$url, Logger::DEBUG);
 933                                 return false;
 934                         }
 935                         return $webfinger;
 936                 }
 937
 938                 // If it is not JSON, maybe it is XML
 939                 $xrd = XML::parseString($data, true);
 940                 if (!is_object($xrd)) {
 941                         Logger::log("No webfinger data retrievable for ".$url, Logger::DEBUG);
 942                         return false;
 943                 }
 944
 945                 $xrd_arr = XML::elementToArray($xrd);
 946                 if (!isset($xrd_arr["xrd"]["link"])) {
 947                         Logger::log("No XML webfinger links for ".$url, Logger::DEBUG);
 948                         return false;
 949                 }
 950
 951                 $webfinger = [];
 952
 953                 if (!empty($xrd_arr["xrd"]["subject"])) {
 954                         $webfinger["subject"] = $xrd_arr["xrd"]["subject"];
 955                 }
 956
 957                 if (!empty($xrd_arr["xrd"]["alias"])) {
 958                         $webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
 959                 }
 960
 961                 $webfinger["links"] = [];
 962
 963                 foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
 964                         if (!empty($data["@attributes"])) {
 965                                 $attributes = $data["@attributes"];
 966                         } elseif ($value == "@attributes") {
 967                                 $attributes = $data;
 968                         } else {
 969                                 continue;
 970                         }
 971
 972                         $webfinger["links"][] = $attributes;
 973                 }
 974                 return $webfinger;
 975         }
 976
 977         /**
 978          * Poll the Friendica specific noscrape page.
 979          *
 980          * "noscrape" is a faster alternative to fetch the data from the hcard.
 981          * This functionality was originally created for the directory.
 982          *
 983          * @param string $noscrape_url Link to the noscrape page
 984          * @param array  $data         The already fetched data
 985          *
 986          * @return array noscrape data
 987          * @throws HTTPException\InternalServerErrorException
 988          */
 989         private static function pollNoscrape($noscrape_url, $data)
 990         {
 991                 $curlResult = Network::curl($noscrape_url);
 992                 if ($curlResult->isTimeout()) {
 993                         self::$istimeout = true;
 994                         return false;
 995                 }
 996                 $content = $curlResult->getBody();
 997                 if (!$content) {
 998                         Logger::log("Empty body for ".$noscrape_url, Logger::DEBUG);
 999                         return false;
1000                 }
1001
1002                 $json = json_decode($content, true);
1003                 if (!is_array($json)) {
1004                         Logger::log("No json data for ".$noscrape_url, Logger::DEBUG);
1005                         return false;
1006                 }
1007
1008                 if (!empty($json["fn"])) {
1009                         $data["name"] = $json["fn"];
1010                 }
1011
1012                 if (!empty($json["addr"])) {
1013                         $data["addr"] = $json["addr"];
1014                 }
1015
1016                 if (!empty($json["nick"])) {
1017                         $data["nick"] = $json["nick"];
1018                 }
1019
1020                 if (!empty($json["guid"])) {
1021                         $data["guid"] = $json["guid"];
1022                 }
1023
1024                 if (!empty($json["comm"])) {
1025                         $data["community"] = $json["comm"];
1026                 }
1027
1028                 if (!empty($json["tags"])) {
1029                         $keywords = implode(", ", $json["tags"]);
1030                         if ($keywords != "") {
1031                                 $data["keywords"] = $keywords;
1032                         }
1033                 }
1034
1035                 $location = Profile::formatLocation($json);
1036                 if ($location) {
1037                         $data["location"] = $location;
1038                 }
1039
1040                 if (!empty($json["about"])) {
1041                         $data["about"] = $json["about"];
1042                 }
1043
1044                 if (!empty($json["key"])) {
1045                         $data["pubkey"] = $json["key"];
1046                 }
1047
1048                 if (!empty($json["photo"])) {
1049                         $data["photo"] = $json["photo"];
1050                 }
1051
1052                 if (!empty($json["dfrn-request"])) {
1053                         $data["request"] = $json["dfrn-request"];
1054                 }
1055
1056                 if (!empty($json["dfrn-confirm"])) {
1057                         $data["confirm"] = $json["dfrn-confirm"];
1058                 }
1059
1060                 if (!empty($json["dfrn-notify"])) {
1061                         $data["notify"] = $json["dfrn-notify"];
1062                 }
1063
1064                 if (!empty($json["dfrn-poll"])) {
1065                         $data["poll"] = $json["dfrn-poll"];
1066                 }
1067
1068                 if (isset($json["hide"])) {
1069                         $data["hide"] = (bool)$json["hide"];
1070                 } else {
1071                         $data["hide"] = false;
1072                 }
1073
1074                 return $data;
1075         }
1076
1077         /**
1078          * Check for valid DFRN data
1079          *
1080          * @param array $data DFRN data
1081          *
1082          * @return int Number of errors
1083          */
1084         public static function validDfrn($data)
1085         {
1086                 $errors = 0;
1087                 if (!isset($data['key'])) {
1088                         $errors ++;
1089                 }
1090                 if (!isset($data['dfrn-request'])) {
1091                         $errors ++;
1092                 }
1093                 if (!isset($data['dfrn-confirm'])) {
1094                         $errors ++;
1095                 }
1096                 if (!isset($data['dfrn-notify'])) {
1097                         $errors ++;
1098                 }
1099                 if (!isset($data['dfrn-poll'])) {
1100                         $errors ++;
1101                 }
1102                 return $errors;
1103         }
1104
1105         /**
1106          * Fetch data from a DFRN profile page and via "noscrape"
1107          *
1108          * @param string $profile_link Link to the profile page
1109          *
1110          * @return array profile data
1111          * @throws HTTPException\InternalServerErrorException
1112          * @throws \ImagickException
1113          */
1114         public static function profile($profile_link)
1115         {
1116                 $data = [];
1117
1118                 Logger::log("Check profile ".$profile_link, Logger::DEBUG);
1119
1120                 // Fetch data via noscrape - this is faster
1121                 $noscrape_url = str_replace(["/hcard/", "/profile/"], "/noscrape/", $profile_link);
1122                 $data = self::pollNoscrape($noscrape_url, $data);
1123
1124                 if (!isset($data["notify"])
1125                         || !isset($data["confirm"])
1126                         || !isset($data["request"])
1127                         || !isset($data["poll"])
1128                         || !isset($data["name"])
1129                         || !isset($data["photo"])
1130                 ) {
1131                         $data = self::pollHcard($profile_link, $data, true);
1132                 }
1133
1134                 $prof_data = [];
1135
1136                 if (empty($data["addr"]) || empty($data["nick"])) {
1137                         $probe_data = self::uri($profile_link);
1138                         $data["addr"] = ($data["addr"] ?? '') ?: $probe_data["addr"];
1139                         $data["nick"] = ($data["nick"] ?? '') ?: $probe_data["nick"];
1140                 }
1141
1142                 $prof_data["addr"]         = $data["addr"];
1143                 $prof_data["nick"]         = $data["nick"];
1144                 $prof_data["dfrn-request"] = $data['request'] ?? null;
1145                 $prof_data["dfrn-confirm"] = $data['confirm'] ?? null;
1146                 $prof_data["dfrn-notify"]  = $data['notify']  ?? null;
1147                 $prof_data["dfrn-poll"]    = $data['poll']    ?? null;
1148                 $prof_data["photo"]        = $data['photo']   ?? null;
1149                 $prof_data["fn"]           = $data['name']    ?? null;
1150                 $prof_data["key"]          = $data['pubkey']  ?? null;
1151
1152                 Logger::log("Result for profile ".$profile_link.": ".print_r($prof_data, true), Logger::DEBUG);
1153
1154                 return $prof_data;
1155         }
1156
1157         /**
1158          * Check for DFRN contact
1159          *
1160          * @param array $webfinger Webfinger data
1161          *
1162          * @return array DFRN data
1163          * @throws HTTPException\InternalServerErrorException
1164          */
1165         private static function dfrn($webfinger)
1166         {
1167                 $hcard_url = "";
1168                 $data = [];
1169                 // The array is reversed to take into account the order of preference for same-rel links
1170                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1171                 foreach (array_reverse($webfinger["links"]) as $link) {
1172                         if (($link["rel"] == ActivityNamespace::DFRN) && !empty($link["href"])) {
1173                                 $data["network"] = Protocol::DFRN;
1174                         } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1175                                 $data["poll"] = $link["href"];
1176                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
1177                                 $data["url"] = $link["href"];
1178                         } elseif (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1179                                 $hcard_url = $link["href"];
1180                         } elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
1181                                 $data["poco"] = $link["href"];
1182                         } elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && !empty($link["href"])) {
1183                                 $data["photo"] = $link["href"];
1184                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1185                                 $data["baseurl"] = trim($link["href"], '/');
1186                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1187                                 $data["guid"] = $link["href"];
1188                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1189                                 $data["pubkey"] = base64_decode($link["href"]);
1190
1191                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1192                                 if (strstr($data["pubkey"], 'RSA ')) {
1193                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1194                                 }
1195                         }
1196                 }
1197
1198                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1199                         foreach ($webfinger["aliases"] as $alias) {
1200                                 if (empty($data["url"]) && !strstr($alias, "@")) {
1201                                         $data["url"] = $alias;
1202                                 } elseif (!strstr($alias, "@") && Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"])) {
1203                                         $data["alias"] = $alias;
1204                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1205                                         $data["addr"] = substr($alias, 5);
1206                                 }
1207                         }
1208                 }
1209
1210                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
1211                         $data["addr"] = substr($webfinger["subject"], 5);
1212                 }
1213
1214                 if (!isset($data["network"]) || ($hcard_url == "")) {
1215                         return false;
1216                 }
1217
1218                 // Fetch data via noscrape - this is faster
1219                 $noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
1220                 $data = self::pollNoscrape($noscrape_url, $data);
1221
1222                 if (isset($data["notify"])
1223                         && isset($data["confirm"])
1224                         && isset($data["request"])
1225                         && isset($data["poll"])
1226                         && isset($data["name"])
1227                         && isset($data["photo"])
1228                 ) {
1229                         return $data;
1230                 }
1231
1232                 $data = self::pollHcard($hcard_url, $data, true);
1233
1234                 return $data;
1235         }
1236
1237         /**
1238          * Poll the hcard page (Diaspora and Friendica specific)
1239          *
1240          * @param string  $hcard_url Link to the hcard page
1241          * @param array   $data      The already fetched data
1242          * @param boolean $dfrn      Poll DFRN specific data
1243          *
1244          * @return array hcard data
1245          * @throws HTTPException\InternalServerErrorException
1246          */
1247         private static function pollHcard($hcard_url, $data, $dfrn = false)
1248         {
1249                 $curlResult = Network::curl($hcard_url);
1250                 if ($curlResult->isTimeout()) {
1251                         self::$istimeout = true;
1252                         return false;
1253                 }
1254                 $content = $curlResult->getBody();
1255                 if (!$content) {
1256                         return false;
1257                 }
1258
1259                 $doc = new DOMDocument();
1260                 if (!@$doc->loadHTML($content)) {
1261                         return false;
1262                 }
1263
1264                 $xpath = new DomXPath($doc);
1265
1266                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1267                 if (!is_object($vcards)) {
1268                         return false;
1269                 }
1270
1271                 if (!isset($data["baseurl"])) {
1272                         $data["baseurl"] = "";
1273                 }
1274
1275                 if ($vcards->length > 0) {
1276                         $vcard = $vcards->item(0);
1277
1278                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1279                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1280                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1281                         if (($search->length > 0) && empty($data["guid"])) {
1282                                 $data["guid"] = $search->item(0)->nodeValue;
1283                         }
1284
1285                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1286                         if ($search->length > 0) {
1287                                 $data["nick"] = $search->item(0)->nodeValue;
1288                         }
1289
1290                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1291                         if ($search->length > 0) {
1292                                 $data["name"] = $search->item(0)->nodeValue;
1293                         }
1294
1295                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1296                         if ($search->length > 0) {
1297                                 $data["searchable"] = $search->item(0)->nodeValue;
1298                         }
1299
1300                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1301                         if ($search->length > 0) {
1302                                 $data["pubkey"] = $search->item(0)->nodeValue;
1303                                 if (strstr($data["pubkey"], 'RSA ')) {
1304                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1305                                 }
1306                         }
1307
1308                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1309                         if ($search->length > 0) {
1310                                 $data["baseurl"] = trim($search->item(0)->nodeValue, "/");
1311                         }
1312                 }
1313
1314                 $avatar = [];
1315                 if (!empty($vcard)) {
1316                         $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1317                         foreach ($photos as $photo) {
1318                                 $attr = [];
1319                                 foreach ($photo->attributes as $attribute) {
1320                                         $attr[$attribute->name] = trim($attribute->value);
1321                                 }
1322
1323                                 if (isset($attr["src"]) && isset($attr["width"])) {
1324                                         $avatar[$attr["width"]] = $attr["src"];
1325                                 }
1326
1327                                 // We don't have a width. So we just take everything that we got.
1328                                 // This is a Hubzilla workaround which doesn't send a width.
1329                                 if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
1330                                         $avatar[] = $attr["src"];
1331                                 }
1332                         }
1333                 }
1334
1335                 if (sizeof($avatar)) {
1336                         ksort($avatar);
1337                         $data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
1338                 }
1339
1340                 if ($dfrn) {
1341                         // Poll DFRN specific data
1342                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1343                         if ($search->length > 0) {
1344                                 foreach ($search as $link) {
1345                                         //$data["request"] = $search->item(0)->nodeValue;
1346                                         $attr = [];
1347                                         foreach ($link->attributes as $attribute) {
1348                                                 $attr[$attribute->name] = trim($attribute->value);
1349                                         }
1350
1351                                         $data[substr($attr["rel"], 5)] = $attr["href"];
1352                                 }
1353                         }
1354
1355                         // Older Friendica versions had used the "uid" field differently than newer versions
1356                         if (!empty($data["nick"]) && !empty($data["guid"]) && ($data["nick"] == $data["guid"])) {
1357                                 unset($data["guid"]);
1358                         }
1359                 }
1360
1361
1362                 return $data;
1363         }
1364
1365         /**
1366          * Check for Diaspora contact
1367          *
1368          * @param array $webfinger Webfinger data
1369          *
1370          * @return array Diaspora data
1371          * @throws HTTPException\InternalServerErrorException
1372          */
1373         private static function diaspora($webfinger)
1374         {
1375                 $hcard_url = "";
1376                 $data = [];
1377
1378                 // The array is reversed to take into account the order of preference for same-rel links
1379                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1380                 foreach (array_reverse($webfinger["links"]) as $link) {
1381                         if (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1382                                 $hcard_url = $link["href"];
1383                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1384                                 $data["baseurl"] = trim($link["href"], '/');
1385                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1386                                 $data["guid"] = $link["href"];
1387                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
1388                                 $data["url"] = $link["href"];
1389                         } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1390                                 $data["poll"] = $link["href"];
1391                         } elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
1392                                 $data["poco"] = $link["href"];
1393                         } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1394                                 $data["notify"] = $link["href"];
1395                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1396                                 $data["pubkey"] = base64_decode($link["href"]);
1397
1398                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1399                                 if (strstr($data["pubkey"], 'RSA ')) {
1400                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1401                                 }
1402                         }
1403                 }
1404
1405                 if (empty($data["url"]) || empty($hcard_url)) {
1406                         return false;
1407                 }
1408
1409                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1410                         foreach ($webfinger["aliases"] as $alias) {
1411                                 if (Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"]) && ! strstr($alias, "@")) {
1412                                         $data["alias"] = $alias;
1413                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1414                                         $data["addr"] = substr($alias, 5);
1415                                 }
1416                         }
1417                 }
1418
1419                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
1420                         $data["addr"] = substr($webfinger["subject"], 5);
1421                 }
1422
1423                 // Fetch further information from the hcard
1424                 $data = self::pollHcard($hcard_url, $data);
1425
1426                 if (!$data) {
1427                         return false;
1428                 }
1429
1430                 if (!empty($data["url"])
1431                         && !empty($data["guid"])
1432                         && !empty($data["baseurl"])
1433                         && !empty($data["pubkey"])
1434                         && !empty($hcard_url)
1435                 ) {
1436                         $data["network"] = Protocol::DIASPORA;
1437
1438                         // The Diaspora handle must always be lowercase
1439                         if (!empty($data["addr"])) {
1440                                 $data["addr"] = strtolower($data["addr"]);
1441                         }
1442
1443                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1444                         $data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
1445                         $data["batch"]  = $data["baseurl"] . "/receive/public";
1446                 } else {
1447                         return false;
1448                 }
1449
1450                 return $data;
1451         }
1452
1453         /**
1454          * Check for OStatus contact
1455          *
1456          * @param array $webfinger Webfinger data
1457          * @param bool  $short     Short detection mode
1458          *
1459          * @return array|bool OStatus data or "false" on error or "true" on short mode
1460          * @throws HTTPException\InternalServerErrorException
1461          */
1462         private static function ostatus($webfinger, $short = false)
1463         {
1464                 $data = [];
1465
1466                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1467                         foreach ($webfinger["aliases"] as $alias) {
1468                                 if (strstr($alias, "@") && !strstr(Strings::normaliseLink($alias), "http://")) {
1469                                         $data["addr"] = str_replace('acct:', '', $alias);
1470                                 }
1471                         }
1472                 }
1473
1474                 if (!empty($webfinger["subject"]) && strstr($webfinger["subject"], "@")
1475                         && !strstr(Strings::normaliseLink($webfinger["subject"]), "http://")
1476                 ) {
1477                         $data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
1478                 }
1479
1480                 if (is_array($webfinger["links"])) {
1481                         // The array is reversed to take into account the order of preference for same-rel links
1482                         // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1483                         foreach (array_reverse($webfinger["links"]) as $link) {
1484                                 if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1485                                         && (($link["type"] ?? "") == "text/html")
1486                                         && ($link["href"] != "")
1487                                 ) {
1488                                         $data["url"] = $link["href"];
1489                                 } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1490                                         $data["notify"] = $link["href"];
1491                                 } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1492                                         $data["poll"] = $link["href"];
1493                                 } elseif (($link["rel"] == "magic-public-key") && !empty($link["href"])) {
1494                                         $pubkey = $link["href"];
1495
1496                                         if (substr($pubkey, 0, 5) === 'data:') {
1497                                                 if (strstr($pubkey, ',')) {
1498                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1499                                                 } else {
1500                                                         $pubkey = substr($pubkey, 5);
1501                                                 }
1502                                         } elseif (Strings::normaliseLink($pubkey) == 'http://') {
1503                                                 $curlResult = Network::curl($pubkey);
1504                                                 if ($curlResult->isTimeout()) {
1505                                                         self::$istimeout = true;
1506                                                         return false;
1507                                                 }
1508                                                 $pubkey = $curlResult->getBody();
1509                                         }
1510
1511                                         $key = explode(".", $pubkey);
1512
1513                                         if (sizeof($key) >= 3) {
1514                                                 $m = Strings::base64UrlDecode($key[1]);
1515                                                 $e = Strings::base64UrlDecode($key[2]);
1516                                                 $data["pubkey"] = Crypto::meToPem($m, $e);
1517                                         }
1518                                 }
1519                         }
1520                 }
1521
1522                 if (isset($data["notify"]) && isset($data["pubkey"])
1523                         && isset($data["poll"])
1524                         && isset($data["url"])
1525                 ) {
1526                         $data["network"] = Protocol::OSTATUS;
1527                 } else {
1528                         return false;
1529                 }
1530
1531                 if ($short) {
1532                         return true;
1533                 }
1534
1535                 // Fetch all additional data from the feed
1536                 $curlResult = Network::curl($data["poll"]);
1537                 if ($curlResult->isTimeout()) {
1538                         self::$istimeout = true;
1539                         return false;
1540                 }
1541                 $feed = $curlResult->getBody();
1542                 $feed_data = Feed::import($feed);
1543                 if (!$feed_data) {
1544                         return false;
1545                 }
1546
1547                 if (!empty($feed_data["header"]["author-name"])) {
1548                         $data["name"] = $feed_data["header"]["author-name"];
1549                 }
1550                 if (!empty($feed_data["header"]["author-nick"])) {
1551                         $data["nick"] = $feed_data["header"]["author-nick"];
1552                 }
1553                 if (!empty($feed_data["header"]["author-avatar"])) {
1554                         $data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
1555                 }
1556                 if (!empty($feed_data["header"]["author-id"])) {
1557                         $data["alias"] = $feed_data["header"]["author-id"];
1558                 }
1559                 if (!empty($feed_data["header"]["author-location"])) {
1560                         $data["location"] = $feed_data["header"]["author-location"];
1561                 }
1562                 if (!empty($feed_data["header"]["author-about"])) {
1563                         $data["about"] = $feed_data["header"]["author-about"];
1564                 }
1565                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1566                 // So we take the value that we just fetched, although the other one worked as well
1567                 if (!empty($feed_data["header"]["author-link"])) {
1568                         $data["url"] = $feed_data["header"]["author-link"];
1569                 }
1570
1571                 if (($data['poll'] == $data['url']) && ($data["alias"] != '')) {
1572                         $data['url'] = $data["alias"];
1573                         $data["alias"] = '';
1574                 }
1575
1576                 /// @todo Fetch location and "about" from the feed as well
1577                 return $data;
1578         }
1579
1580         /**
1581          * Fetch data from a pump.io profile page
1582          *
1583          * @param string $profile_link Link to the profile page
1584          *
1585          * @return array profile data
1586          */
1587         private static function pumpioProfileData($profile_link)
1588         {
1589                 $curlResult = Network::curl($profile_link);
1590                 if (!$curlResult->isSuccess()) {
1591                         return false;
1592                 }
1593
1594                 $doc = new DOMDocument();
1595                 if (!@$doc->loadHTML($curlResult->getBody())) {
1596                         return false;
1597                 }
1598
1599                 $xpath = new DomXPath($doc);
1600
1601                 $data = [];
1602
1603                 $data["name"] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
1604
1605                 if ($data["name"] == '') {
1606                         // This is ugly - but pump.io doesn't seem to know a better way for it
1607                         $data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1608                         $pos = strpos($data["name"], chr(10));
1609                         if ($pos) {
1610                                 $data["name"] = trim(substr($data["name"], 0, $pos));
1611                         }
1612                 }
1613
1614                 $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-locality')]");
1615
1616                 if ($data["location"] == '') {
1617                         $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'location')]");
1618                 }
1619
1620                 $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-note')]");
1621
1622                 if ($data["about"] == '') {
1623                         $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'summary')]");
1624                 }
1625
1626                 $avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
1627                 if (!$avatar) {
1628                         $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1629                 }
1630                 if ($avatar) {
1631                         foreach ($avatar->attributes as $attribute) {
1632                                 if ($attribute->name == "src") {
1633                                         $data["photo"] = trim($attribute->value);
1634                                 }
1635                         }
1636                 }
1637
1638                 return $data;
1639         }
1640
1641         /**
1642          * Check for pump.io contact
1643          *
1644          * @param array  $webfinger Webfinger data
1645          * @param string $addr
1646          * @return array pump.io data
1647          */
1648         private static function pumpio($webfinger, $addr)
1649         {
1650                 $data = [];
1651                 // The array is reversed to take into account the order of preference for same-rel links
1652                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1653                 foreach (array_reverse($webfinger["links"]) as $link) {
1654                         if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1655                                 && (($link["type"] ?? "") == "text/html")
1656                                 && ($link["href"] != "")
1657                         ) {
1658                                 $data["url"] = $link["href"];
1659                         } elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
1660                                 $data["notify"] = $link["href"];
1661                         } elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
1662                                 $data["poll"] = $link["href"];
1663                         } elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
1664                                 $data["dialback"] = $link["href"];
1665                         }
1666                 }
1667                 if (isset($data["poll"]) && isset($data["notify"])
1668                         && isset($data["dialback"])
1669                         && isset($data["url"])
1670                 ) {
1671                         // by now we use these fields only for the network type detection
1672                         // So we unset all data that isn't used at the moment
1673                         unset($data["dialback"]);
1674
1675                         $data["network"] = Protocol::PUMPIO;
1676                 } else {
1677                         return false;
1678                 }
1679
1680                 $profile_data = self::pumpioProfileData($data["url"]);
1681
1682                 if (!$profile_data) {
1683                         return false;
1684                 }
1685
1686                 $data = array_merge($data, $profile_data);
1687
1688                 if (($addr != '') && ($data['name'] != '')) {
1689                         $name = trim(str_replace($addr, '', $data['name']));
1690                         if ($name != '') {
1691                                 $data['name'] = $name;
1692                         }
1693                 }
1694
1695                 return $data;
1696         }
1697
1698         /**
1699          * Check for twitter contact
1700          *
1701          * @param string $uri
1702          *
1703          * @return array twitter data
1704          */
1705         private static function twitter($uri)
1706         {
1707                 if (preg_match('=(.*)@twitter.com=i', $uri, $matches)) {
1708                         $nick = $matches[1];
1709                 } elseif (preg_match('=https?://twitter.com/(.*)=i', $uri, $matches)) {
1710                         $nick = $matches[1];
1711                 } else {
1712                         return [];
1713                 }
1714
1715                 $data = [];
1716                 $data['url'] = 'https://twitter.com/' . $nick;
1717                 $data['addr'] = $nick . '@twitter.com';
1718                 $data['nick'] = $data['name'] = $nick;
1719                 $data['network'] = Protocol::TWITTER;
1720                 $data['baseurl'] = 'https://twitter.com';
1721
1722                 $curlResult = Network::curl($data['url'], false);
1723                 if (!$curlResult->isSuccess()) {
1724                         return [];
1725                 }
1726
1727                 $body = $curlResult->getBody();
1728                 $doc = new DOMDocument();
1729                 @$doc->loadHTML($body);
1730                 $xpath = new DOMXPath($doc);
1731
1732                 $list = $xpath->query('//img[@class]');
1733                 foreach ($list as $node) {
1734                         $img_attr = [];
1735                         if ($node->attributes->length) {
1736                                 foreach ($node->attributes as $attribute) {
1737                                         $img_attr[$attribute->name] = $attribute->value;
1738                                 }
1739                         }
1740
1741                         if (empty($img_attr['class'])) {
1742                                 continue;
1743                         }
1744
1745                         if (strpos($img_attr['class'], 'ProfileAvatar-image') !== false) {
1746                                 if (!empty($img_attr['src'])) {
1747                                         $data['photo'] = $img_attr['src'];
1748                                 }
1749                                 if (!empty($img_attr['alt'])) {
1750                                         $data['name'] = $img_attr['alt'];
1751                                 }
1752                         }
1753                 }
1754
1755                 return $data;
1756         }
1757
1758         /**
1759          * Check page for feed link
1760          *
1761          * @param string $url Page link
1762          *
1763          * @return string feed link
1764          */
1765         private static function getFeedLink($url)
1766         {
1767                 $curlResult = Network::curl($url);
1768                 if (!$curlResult->isSuccess()) {
1769                         return false;
1770                 }
1771
1772                 $doc = new DOMDocument();
1773                 if (!@$doc->loadHTML($curlResult->getBody())) {
1774                         return false;
1775                 }
1776
1777                 $xpath = new DomXPath($doc);
1778
1779                 //$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
1780                 $feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
1781                 if (!is_object($feeds)) {
1782                         return false;
1783                 }
1784
1785                 if ($feeds->length == 0) {
1786                         return false;
1787                 }
1788
1789                 $feed_url = "";
1790
1791                 foreach ($feeds as $feed) {
1792                         $attr = [];
1793                         foreach ($feed->attributes as $attribute) {
1794                                 $attr[$attribute->name] = trim($attribute->value);
1795                         }
1796
1797                         if (empty($feed_url) && !empty($attr['href'])) {
1798                                 $feed_url = $attr["href"];
1799                         }
1800                 }
1801
1802                 return $feed_url;
1803         }
1804
1805         /**
1806          * Check for feed contact
1807          *
1808          * @param string  $url   Profile link
1809          * @param boolean $probe Do a probe if the page contains a feed link
1810          *
1811          * @return array feed data
1812          * @throws HTTPException\InternalServerErrorException
1813          */
1814         private static function feed($url, $probe = true)
1815         {
1816                 $curlResult = Network::curl($url);
1817                 if ($curlResult->isTimeout()) {
1818                         self::$istimeout = true;
1819                         return false;
1820                 }
1821                 $feed = $curlResult->getBody();
1822                 $feed_data = Feed::import($feed);
1823
1824                 if (!$feed_data) {
1825                         if (!$probe) {
1826                                 return false;
1827                         }
1828
1829                         $feed_url = self::getFeedLink($url);
1830
1831                         if (!$feed_url) {
1832                                 return false;
1833                         }
1834
1835                         return self::feed($feed_url, false);
1836                 }
1837
1838                 if (!empty($feed_data["header"]["author-name"])) {
1839                         $data["name"] = $feed_data["header"]["author-name"];
1840                 }
1841
1842                 if (!empty($feed_data["header"]["author-nick"])) {
1843                         $data["nick"] = $feed_data["header"]["author-nick"];
1844                 }
1845
1846                 if (!empty($feed_data["header"]["author-avatar"])) {
1847                         $data["photo"] = $feed_data["header"]["author-avatar"];
1848                 }
1849
1850                 if (!empty($feed_data["header"]["author-id"])) {
1851                         $data["alias"] = $feed_data["header"]["author-id"];
1852                 }
1853
1854                 $data["url"] = $url;
1855                 $data["poll"] = $url;
1856
1857                 if (!empty($feed_data["header"]["author-link"])) {
1858                         $data["baseurl"] = $feed_data["header"]["author-link"];
1859                 } else {
1860                         $data["baseurl"] = $data["url"];
1861                 }
1862
1863                 $data["network"] = Protocol::FEED;
1864
1865                 return $data;
1866         }
1867
1868         /**
1869          * Check for mail contact
1870          *
1871          * @param string  $uri Profile link
1872          * @param integer $uid User ID
1873          *
1874          * @return array mail data
1875          * @throws \Exception
1876          */
1877         private static function mail($uri, $uid)
1878         {
1879                 if (!Network::isEmailDomainValid($uri)) {
1880                         return false;
1881                 }
1882
1883                 if ($uid == 0) {
1884                         return false;
1885                 }
1886
1887                 $user = DBA::selectFirst('user', ['prvkey'], ['uid' => $uid]);
1888
1889                 $condition = ["`uid` = ? AND `server` != ''", $uid];
1890                 $fields = ['pass', 'user', 'server', 'port', 'ssltype', 'mailbox'];
1891                 $mailacct = DBA::selectFirst('mailacct', $fields, $condition);
1892
1893                 if (!DBA::isResult($user) || !DBA::isResult($mailacct)) {
1894                         return false;
1895                 }
1896
1897                 $mailbox = Email::constructMailboxName($mailacct);
1898                 $password = '';
1899                 openssl_private_decrypt(hex2bin($mailacct['pass']), $password, $user['prvkey']);
1900                 $mbox = Email::connect($mailbox, $mailacct['user'], $password);
1901                 if (!$mbox) {
1902                         return false;
1903                 }
1904
1905                 $msgs = Email::poll($mbox, $uri);
1906                 Logger::log('searching '.$uri.', '.count($msgs).' messages found.', Logger::DEBUG);
1907
1908                 if (!count($msgs)) {
1909                         return false;
1910                 }
1911
1912                 $phost = substr($uri, strpos($uri, '@') + 1);
1913
1914                 $data = [];
1915                 $data["addr"]    = $uri;
1916                 $data["network"] = Protocol::MAIL;
1917                 $data["name"]    = substr($uri, 0, strpos($uri, '@'));
1918                 $data["nick"]    = $data["name"];
1919                 $data["photo"]   = Network::lookupAvatarByEmail($uri);
1920                 $data["url"]     = 'mailto:'.$uri;
1921                 $data["notify"]  = 'smtp ' . Strings::getRandomHex();
1922                 $data["poll"]    = 'email ' . Strings::getRandomHex();
1923
1924                 $x = Email::messageMeta($mbox, $msgs[0]);
1925                 if (stristr($x[0]->from, $uri)) {
1926                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1927                 } elseif (stristr($x[0]->to, $uri)) {
1928                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1929                 }
1930                 if (isset($adr)) {
1931                         foreach ($adr as $feadr) {
1932                                 if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
1933                                         &&(strcasecmp($feadr->host, $phost) == 0)
1934                                         && (strlen($feadr->personal))
1935                                 ) {
1936                                         $personal = imap_mime_header_decode($feadr->personal);
1937                                         $data["name"] = "";
1938                                         foreach ($personal as $perspart) {
1939                                                 if ($perspart->charset != "default") {
1940                                                         $data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1941                                                 } else {
1942                                                         $data["name"] .= $perspart->text;
1943                                                 }
1944                                         }
1945
1946                                         $data["name"] = Strings::escapeTags($data["name"]);
1947                                 }
1948                         }
1949                 }
1950                 if (!empty($mbox)) {
1951                         imap_close($mbox);
1952                 }
1953                 return $data;
1954         }
1955
1956         /**
1957          * Mix two paths together to possibly fix missing parts
1958          *
1959          * @param string $avatar Path to the avatar
1960          * @param string $base   Another path that is hopefully complete
1961          *
1962          * @return string fixed avatar path
1963          * @throws \Exception
1964          */
1965         public static function fixAvatar($avatar, $base)
1966         {
1967                 $base_parts = parse_url($base);
1968
1969                 // Remove all parts that could create a problem
1970                 unset($base_parts['path']);
1971                 unset($base_parts['query']);
1972                 unset($base_parts['fragment']);
1973
1974                 $avatar_parts = parse_url($avatar);
1975
1976                 // Now we mix them
1977                 $parts = array_merge($base_parts, $avatar_parts);
1978
1979                 // And put them together again
1980                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
1981                 $host     = isset($parts['host'])     ? $parts['host']           : '';
1982                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
1983                 $path     = isset($parts['path'])     ? $parts['path']           : '';
1984                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
1985                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
1986
1987                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
1988
1989                 Logger::log('Base: '.$base.' - Avatar: '.$avatar.' - Fixed: '.$fixed, Logger::DATA);
1990
1991                 return $fixed;
1992         }
1993 }