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\GServer;
  34 use Friendica\Model\Profile;
  35 use Friendica\Protocol\ActivityNamespace;
  36 use Friendica\Protocol\ActivityPub;
  37 use Friendica\Protocol\Email;
  38 use Friendica\Protocol\Feed;
  39 use Friendica\Util\Crypto;
  40 use Friendica\Util\Network;
  41 use Friendica\Util\Strings;
  42 use Friendica\Util\XML;
  43
  44 /**
  45  * This class contain functions for probing URL
  46  */
  47 class Probe
  48 {
  49         private static $baseurl;
  50         private static $istimeout;
  51
  52         /**
  53          * Remove stuff from an URI that doesn't belong there
  54          *
  55          * @param string $URI
  56          * @return string Cleaned URI
  57          */
  58         public static function cleanURI(string $URI)
  59         {
  60                 // At first remove leading and trailing junk
  61                 $URI = trim($URI, "@#?:/ \t\n\r\0\x0B");
  62
  63                 $parts = parse_url($URI);
  64
  65                 if (empty($parts['scheme'])) {
  66                         return $URI;
  67                 }
  68
  69                 // Remove the URL fragment, since these shouldn't be part of any profile URL
  70                 unset($parts['fragment']);
  71
  72                 $URI = Network::unparseURL($parts);
  73
  74                 return $URI;
  75         }
  76
  77         /**
  78          * Rearrange the array so that it always has the same order
  79          *
  80          * @param array $data Unordered data
  81          *
  82          * @return array Ordered data
  83          */
  84         private static function rearrangeData($data)
  85         {
  86                 $fields = ["name", "nick", "guid", "url", "addr", "alias", "photo", "account-type",
  87                                 "community", "keywords", "location", "about", "hide",
  88                                 "batch", "notify", "poll", "request", "confirm", "subscribe", "poco",
  89                                 "following", "followers", "inbox", "outbox", "sharedinbox",
  90                                 "priority", "network", "pubkey", "baseurl", "gsid"];
  91
  92                 $newdata = [];
  93                 foreach ($fields as $field) {
  94                         if (isset($data[$field])) {
  95                                 if (in_array($field, ["gsid", "hide", "account-type"])) {
  96                                         $newdata[$field] = (int)$data[$field];
  97                                 } else {
  98                                         $newdata[$field] = $data[$field];
  99                                 }
 100                         } elseif ($field != "gsid") {
 101                                 $newdata[$field] = "";
 102                         } else {
 103                                 $newdata[$field] = null;
 104                         }
 105                 }
 106
 107                 // We don't use the "priority" field anymore and replace it with a dummy.
 108                 $newdata["priority"] = 0;
 109
 110                 return $newdata;
 111         }
 112
 113         /**
 114          * Check if the hostname belongs to the own server
 115          *
 116          * @param string $host The hostname that is to be checked
 117          *
 118          * @return bool Does the testes hostname belongs to the own server?
 119          */
 120         private static function ownHost($host)
 121         {
 122                 $own_host = DI::baseUrl()->getHostname();
 123
 124                 $parts = parse_url($host);
 125
 126                 if (!isset($parts['scheme'])) {
 127                         $parts = parse_url('http://'.$host);
 128                 }
 129
 130                 if (!isset($parts['host'])) {
 131                         return false;
 132                 }
 133                 return $parts['host'] == $own_host;
 134         }
 135
 136         /**
 137          * Probes for webfinger path via "host-meta"
 138          *
 139          * We have to check if the servers in the future still will offer this.
 140          * It seems as if it was dropped from the standard.
 141          *
 142          * @param string $host The host part of an url
 143          *
 144          * @return array with template and type of the webfinger template for JSON or XML
 145          * @throws HTTPException\InternalServerErrorException
 146          */
 147         private static function hostMeta($host)
 148         {
 149                 // Reset the static variable
 150                 self::$baseurl = '';
 151
 152                 // Handles the case when the hostname contains the scheme
 153                 if (!parse_url($host, PHP_URL_SCHEME)) {
 154                         $ssl_url = "https://" . $host . "/.well-known/host-meta";
 155                         $url = "http://" . $host . "/.well-known/host-meta";
 156                 } else {
 157                         $ssl_url = $host . "/.well-known/host-meta";
 158                         $url = '';
 159                 }
 160
 161                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 162
 163                 Logger::info('Probing', ['host' => $host, 'ssl_url' => $ssl_url, 'url' => $url, 'callstack' => System::callstack(20)]);
 164                 $xrd = null;
 165
 166                 $curlResult = Network::curl($ssl_url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 167                 $ssl_connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 168                 if ($curlResult->isSuccess()) {
 169                         $xml = $curlResult->getBody();
 170                         $xrd = XML::parseString($xml, true);
 171                         if (!empty($url)) {
 172                                 $host_url = 'https://' . $host;
 173                         } else {
 174                                 $host_url = $host;
 175                         }
 176                 } elseif ($curlResult->isTimeout()) {
 177                         Logger::info('Probing timeout', ['url' => $ssl_url], Logger::DEBUG);
 178                         self::$istimeout = true;
 179                         return [];
 180                 }
 181
 182                 if (!is_object($xrd) && !empty($url)) {
 183                         $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 184                         $connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 185                         if ($curlResult->isTimeout()) {
 186                                 Logger::info('Probing timeout', ['url' => $url], Logger::DEBUG);
 187                                 self::$istimeout = true;
 188                                 return [];
 189                         } elseif ($connection_error && $ssl_connection_error) {
 190                                 self::$istimeout = true;
 191                                 return [];
 192                         }
 193
 194                         $xml = $curlResult->getBody();
 195                         $xrd = XML::parseString($xml, true);
 196                         $host_url = 'http://'.$host;
 197                 }
 198                 if (!is_object($xrd)) {
 199                         Logger::log("No xrd object found for ".$host, Logger::DEBUG);
 200                         return [];
 201                 }
 202
 203                 $links = XML::elementToArray($xrd);
 204                 if (!isset($links["xrd"]["link"])) {
 205                         Logger::log("No xrd data found for ".$host, Logger::DEBUG);
 206                         return [];
 207                 }
 208
 209                 $lrdd = ['application/jrd+json' => $host_url . '/.well-known/webfinger?resource={uri}'];
 210
 211                 foreach ($links["xrd"]["link"] as $value => $link) {
 212                         if (!empty($link["@attributes"])) {
 213                                 $attributes = $link["@attributes"];
 214                         } elseif ($value == "@attributes") {
 215                                 $attributes = $link;
 216                         } else {
 217                                 continue;
 218                         }
 219
 220                         if (!empty($attributes["rel"]) && $attributes["rel"] == "lrdd" && !empty($attributes["template"])) {
 221                                 $type = (empty($attributes["type"]) ? '' : $attributes["type"]);
 222
 223                                 $lrdd[$type] = $attributes["template"];
 224                         }
 225                 }
 226
 227                 self::$baseurl = $host_url;
 228
 229                 Logger::log("Probing successful for ".$host, Logger::DEBUG);
 230
 231                 return $lrdd;
 232         }
 233
 234         /**
 235          * Perform Webfinger lookup and return DFRN data
 236          *
 237          * Given an email style address, perform webfinger lookup and
 238          * return the resulting DFRN profile URL, or if no DFRN profile URL
 239          * is located, returns an OStatus subscription template (prefixed
 240          * with the string 'stat:' to identify it as on OStatus template).
 241          * If this isn't an email style address just return $webbie.
 242          * Return an empty string if email-style addresses but webfinger fails,
 243          * or if the resultant personal XRD doesn't contain a supported
 244          * subscription/friend-request attribute.
 245          *
 246          * amended 7/9/2011 to return an hcard which could save potentially loading
 247          * a lengthy content page to scrape dfrn attributes
 248          *
 249          * @param string $webbie    Address that should be probed
 250          * @param string $hcard_url Link to the hcard - is returned by reference
 251          *
 252          * @return string profile link
 253          * @throws HTTPException\InternalServerErrorException
 254          */
 255         public static function webfingerDfrn($webbie, &$hcard_url)
 256         {
 257                 $profile_link = '';
 258
 259                 $links = self::lrdd($webbie);
 260                 Logger::log('webfingerDfrn: '.$webbie.':'.print_r($links, true), Logger::DATA);
 261                 if (!empty($links) && is_array($links)) {
 262                         foreach ($links as $link) {
 263                                 if ($link['@attributes']['rel'] === ActivityNamespace::DFRN) {
 264                                         $profile_link = $link['@attributes']['href'];
 265                                 }
 266                                 if (($link['@attributes']['rel'] === ActivityNamespace::OSTATUSSUB) && ($profile_link == "")) {
 267                                         $profile_link = 'stat:'.$link['@attributes']['template'];
 268                                 }
 269                                 if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
 270                                         $hcard_url = $link['@attributes']['href'];
 271                                 }
 272                         }
 273                 }
 274                 return $profile_link;
 275         }
 276
 277         /**
 278          * Check an URI for LRDD data
 279          *
 280          * @param string $uri     Address that should be probed
 281          *
 282          * @return array uri data
 283          * @throws HTTPException\InternalServerErrorException
 284          */
 285         public static function lrdd(string $uri)
 286         {
 287                 $lrdd = self::hostMeta($uri);
 288                 $webfinger = null;
 289
 290                 if (is_bool($lrdd)) {
 291                         return [];
 292                 }
 293
 294                 if (!$lrdd) {
 295                         $parts = @parse_url($uri);
 296                         if (!$parts || empty($parts["host"]) || empty($parts["path"])) {
 297                                 return [];
 298                         }
 299
 300                         $host = $parts['scheme'] . '://' . $parts["host"];
 301                         if (!empty($parts["port"])) {
 302                                 $host .= ':'.$parts["port"];
 303                         }
 304
 305                         $path_parts = explode("/", trim($parts["path"], "/"));
 306
 307                         $nick = array_pop($path_parts);
 308
 309                         do {
 310                                 $lrdd = self::hostMeta($host);
 311                                 $host .= "/".array_shift($path_parts);
 312                         } while (!$lrdd && (sizeof($path_parts) > 0));
 313                 }
 314
 315                 if (!$lrdd) {
 316                         Logger::log("No lrdd data found for ".$uri, Logger::DEBUG);
 317                         return [];
 318                 }
 319
 320                 foreach ($lrdd as $type => $template) {
 321                         if ($webfinger) {
 322                                 continue;
 323                         }
 324
 325                         $path = str_replace('{uri}', urlencode($uri), $template);
 326                         $webfinger = self::webfinger($path, $type);
 327
 328                         if (!$webfinger && (strstr($uri, "@"))) {
 329                                 $path = str_replace('{uri}', urlencode("acct:".$uri), $template);
 330                                 $webfinger = self::webfinger($path, $type);
 331                         }
 332
 333                         // Special treatment for Mastodon
 334                         // Problem is that Mastodon uses an URL format like http://domain.tld/@nick
 335                         // But the webfinger for this format fails.
 336                         if (!$webfinger && !empty($nick)) {
 337                                 // Mastodon uses a "@" as prefix for usernames in their url format
 338                                 $nick = ltrim($nick, '@');
 339
 340                                 $addr = $nick."@".$host;
 341
 342                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 343                                 $webfinger = self::webfinger($path, $type);
 344                         }
 345                 }
 346
 347                 if (empty($webfinger["links"])) {
 348                         Logger::log("No webfinger links found for ".$uri, Logger::DEBUG);
 349                         return [];
 350                 }
 351
 352                 $data = [];
 353
 354                 foreach ($webfinger["links"] as $link) {
 355                         $data[] = ["@attributes" => $link];
 356                 }
 357
 358                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 359                         foreach ($webfinger["aliases"] as $alias) {
 360                                 $data[] = ["@attributes" =>
 361                                                         ["rel" => "alias",
 362                                                                 "href" => $alias]];
 363                         }
 364                 }
 365
 366                 return $data;
 367         }
 368
 369         /**
 370          * Fetch information (protocol endpoints and user information) about a given uri
 371          *
 372          * @param string  $uri     Address that should be probed
 373          * @param string  $network Test for this specific network
 374          * @param integer $uid     User ID for the probe (only used for mails)
 375          * @param boolean $cache   Use cached values?
 376          *
 377          * @return array uri data
 378          * @throws HTTPException\InternalServerErrorException
 379          * @throws \ImagickException
 380          */
 381         public static function uri($uri, $network = '', $uid = -1, $cache = true)
 382         {
 383                 if ($cache) {
 384                         $result = DI::cache()->get('Probe::uri:' . $network . ':' . $uri);
 385                         if (!is_null($result)) {
 386                                 return $result;
 387                         }
 388                 }
 389
 390                 if ($uid == -1) {
 391                         $uid = local_user();
 392                 }
 393
 394                 self::$istimeout = false;
 395
 396                 if ($network != Protocol::ACTIVITYPUB) {
 397                         $data = self::detect($uri, $network, $uid);
 398                 } else {
 399                         $data = null;
 400                 }
 401
 402                 // When the previous detection process had got a time out
 403                 // we could falsely detect a Friendica profile as AP profile.
 404                 if (!self::$istimeout) {
 405                         $ap_profile = ActivityPub::probeProfile($uri, !$cache);
 406
 407                         if (empty($data) || (!empty($ap_profile) && empty($network) && (($data['network'] ?? '') != Protocol::DFRN))) {
 408                                 $data = $ap_profile;
 409                         } elseif (!empty($ap_profile)) {
 410                                 $ap_profile['batch'] = '';
 411                                 $data = array_merge($ap_profile, $data);
 412                         }
 413                 } else {
 414                         Logger::notice('Time out detected. AP will not be probed.', ['uri' => $uri]);
 415                 }
 416
 417                 if (!isset($data['url'])) {
 418                         $data['url'] = $uri;
 419                 }
 420
 421                 if (empty($data['photo'])) {
 422                         $data['photo'] = DI::baseUrl() . '/images/person-300.jpg';
 423                 }
 424
 425                 if (empty($data['name'])) {
 426                         if (!empty($data['nick'])) {
 427                                 $data['name'] = $data['nick'];
 428                         }
 429
 430                         if (empty($data['name'])) {
 431                                 $data['name'] = $data['url'];
 432                         }
 433                 }
 434
 435                 if (empty($data['nick'])) {
 436                         $data['nick'] = strtolower($data['name']);
 437
 438                         if (strpos($data['nick'], ' ')) {
 439                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 440                         }
 441                 }
 442
 443                 if (!empty(self::$baseurl)) {
 444                         $data['baseurl'] = self::$baseurl;
 445                 }
 446
 447                 if (!empty($data['baseurl']) && empty($data['gsid'])) {
 448                         $data['gsid'] = GServer::getID($data['baseurl']);
 449                 }
 450
 451                 if (empty($data['network'])) {
 452                         $data['network'] = Protocol::PHANTOM;
 453                 }
 454
 455                 // Ensure that local connections always are DFRN
 456                 if (($network == '') && ($data['network'] != Protocol::PHANTOM) && (self::ownHost($data['baseurl'] ?? '') || self::ownHost($data['url']))) {
 457                         $data['network'] = Protocol::DFRN;
 458                 }
 459
 460                 if (!isset($data['hide']) && in_array($data['network'], Protocol::FEDERATED)) {
 461                         $data['hide'] = self::getHideStatus($data['url']);
 462                 }
 463
 464                 $data = self::rearrangeData($data);
 465
 466                 // Only store into the cache if the value seems to be valid
 467                 if (!in_array($data['network'], [Protocol::PHANTOM, Protocol::MAIL])) {
 468                         DI::cache()->set('Probe::uri:' . $network . ':' . $uri, $data, Duration::DAY);
 469                 }
 470
 471                 return $data;
 472         }
 473
 474
 475         /**
 476          * Fetches the "hide" status from the profile
 477          *
 478          * @param string $url URL of the profile
 479          *
 480          * @return boolean "hide" status
 481          */
 482         private static function getHideStatus($url)
 483         {
 484                 $curlResult = Network::curl($url);
 485                 if (!$curlResult->isSuccess()) {
 486                         return false;
 487                 }
 488
 489                 // If the file is too large then exit
 490                 if (($curlResult->getInfo()['download_content_length'] ?? 0) > 1000000) {
 491                         return false;
 492                 }
 493
 494                 // If it isn't a HTML file then exit
 495                 if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
 496                         return false;
 497                 }
 498
 499                 $body = $curlResult->getBody();
 500
 501                 $doc = new DOMDocument();
 502                 @$doc->loadHTML($body);
 503
 504                 $xpath = new DOMXPath($doc);
 505
 506                 $list = $xpath->query('//meta[@name]');
 507                 foreach ($list as $node) {
 508                         $meta_tag = [];
 509                         if ($node->attributes->length) {
 510                                 foreach ($node->attributes as $attribute) {
 511                                         $meta_tag[$attribute->name] = $attribute->value;
 512                                 }
 513                         }
 514
 515                         if (empty($meta_tag['content'])) {
 516                                 continue;
 517                         }
 518
 519                         $content = strtolower(trim($meta_tag['content']));
 520
 521                         switch (strtolower(trim($meta_tag['name']))) {
 522                                 case 'dfrn-global-visibility':
 523                                         if ($content == 'false') {
 524                                                 return true;
 525                                         }
 526                                         break;
 527                                 case 'robots':
 528                                         if (strpos($content, 'noindex') !== false) {
 529                                                 return true;
 530                                         }
 531                                         break;
 532                         }
 533                 }
 534
 535                 return false;
 536         }
 537
 538         /**
 539          * Checks if a profile url should be OStatus but only provides partial information
 540          *
 541          * @param array  $webfinger Webfinger data
 542          * @param string $lrdd      Path template for webfinger request
 543          * @param string $type      type
 544          *
 545          * @return array fixed webfinger data
 546          * @throws HTTPException\InternalServerErrorException
 547          */
 548         private static function fixOStatus($webfinger, $lrdd, $type)
 549         {
 550                 if (empty($webfinger['links']) || empty($webfinger['subject'])) {
 551                         return $webfinger;
 552                 }
 553
 554                 $is_ostatus = false;
 555                 $has_key = false;
 556
 557                 foreach ($webfinger['links'] as $link) {
 558                         if ($link['rel'] == ActivityNamespace::OSTATUSSUB) {
 559                                 $is_ostatus = true;
 560                         }
 561                         if ($link['rel'] == 'magic-public-key') {
 562                                 $has_key = true;
 563                         }
 564                 }
 565
 566                 if (!$is_ostatus || $has_key) {
 567                         return $webfinger;
 568                 }
 569
 570                 $url = Network::switchScheme($webfinger['subject']);
 571                 $path = str_replace('{uri}', urlencode($url), $lrdd);
 572                 $webfinger2 = self::webfinger($path, $type);
 573
 574                 // Is the new webfinger detectable as OStatus?
 575                 if (self::ostatus($webfinger2, true)) {
 576                         $webfinger = $webfinger2;
 577                 }
 578
 579                 return $webfinger;
 580         }
 581
 582         /**
 583          * Fetch the "subscribe" and add it to the result
 584          *
 585          * @param array $result
 586          * @param array $webfinger
 587          * @return array result
 588          */
 589         private static function getSubscribeLink(array $result, array $webfinger)
 590         {
 591                 if (empty($webfinger['links'])) {
 592                         return $result;
 593                 }
 594
 595                 foreach ($webfinger['links'] as $link) {
 596                         if ($link['rel'] === ActivityNamespace::OSTATUSSUB) {
 597                                 $result['subscribe'] = $link['template'];
 598                         }
 599                 }
 600
 601                 return $result;
 602         }
 603
 604         /**
 605          * Fetch information (protocol endpoints and user information) about a given uri
 606          *
 607          * This function is only called by the "uri" function that adds caching and rearranging of data.
 608          *
 609          * @param string  $uri     Address that should be probed
 610          * @param string  $network Test for this specific network
 611          * @param integer $uid     User ID for the probe (only used for mails)
 612          *
 613          * @return array uri data
 614          * @throws HTTPException\InternalServerErrorException
 615          */
 616         private static function detect($uri, $network, $uid)
 617         {
 618                 $parts = parse_url($uri);
 619
 620                 if (!empty($parts["scheme"]) && !empty($parts["host"])) {
 621                         $host = $parts["host"];
 622                         if (!empty($parts["port"])) {
 623                                 $host .= ':'.$parts["port"];
 624                         }
 625
 626                         if ($host == 'twitter.com') {
 627                                 return self::twitter($uri);
 628                         }
 629                         $lrdd = self::hostMeta($host);
 630
 631                         if (is_bool($lrdd)) {
 632                                 return [];
 633                         }
 634
 635                         $path_parts = explode("/", trim($parts['path'] ?? '', "/"));
 636
 637                         while (!$lrdd && (sizeof($path_parts) > 1)) {
 638                                 $host .= "/".array_shift($path_parts);
 639                                 $lrdd = self::hostMeta($host);
 640                         }
 641                         if (!$lrdd) {
 642                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 643                                 return self::feed($uri);
 644                         }
 645                         $nick = array_pop($path_parts);
 646
 647                         // Mastodon uses a "@" as prefix for usernames in their url format
 648                         $nick = ltrim($nick, '@');
 649
 650                         $addr = $nick."@".$host;
 651                 } elseif (strstr($uri, '@')) {
 652                         // If the URI starts with "mailto:" then jump directly to the mail detection
 653                         if (strpos($uri, 'mailto:') !== false) {
 654                                 $uri = str_replace('mailto:', '', $uri);
 655                                 return self::mail($uri, $uid);
 656                         }
 657
 658                         if ($network == Protocol::MAIL) {
 659                                 return self::mail($uri, $uid);
 660                         }
 661                         // Remove "acct:" from the URI
 662                         $uri = str_replace('acct:', '', $uri);
 663
 664                         $host = substr($uri, strpos($uri, '@') + 1);
 665                         $nick = substr($uri, 0, strpos($uri, '@'));
 666
 667                         if (strpos($uri, '@twitter.com')) {
 668                                 return self::twitter($uri);
 669                         }
 670                         $lrdd = self::hostMeta($host);
 671
 672                         if (is_bool($lrdd)) {
 673                                 return [];
 674                         }
 675
 676                         if (!$lrdd) {
 677                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 678                                 return self::mail($uri, $uid);
 679                         }
 680                         $addr = $uri;
 681                 } else {
 682                         Logger::log("Uri ".$uri." was not detectable", Logger::DEBUG);
 683                         return [];
 684                 }
 685
 686                 $webfinger = false;
 687
 688                 /// @todo Do we need the prefix "acct:" or "acct://"?
 689
 690                 foreach ($lrdd as $type => $template) {
 691                         if ($webfinger) {
 692                                 continue;
 693                         }
 694
 695                         // At first try it with the given uri
 696                         $path = str_replace('{uri}', urlencode($uri), $template);
 697                         $webfinger = self::webfinger($path, $type);
 698
 699                         // Fix possible problems with GNU Social probing to wrong scheme
 700                         $webfinger = self::fixOStatus($webfinger, $template, $type);
 701
 702                         // We cannot be sure that the detected address was correct, so we don't use the values
 703                         if ($webfinger && ($uri != $addr)) {
 704                                 $nick = "";
 705                                 $addr = "";
 706                         }
 707
 708                         // Try webfinger with the address (user@domain.tld)
 709                         if (!$webfinger) {
 710                                 $path = str_replace('{uri}', urlencode($addr), $template);
 711                                 $webfinger = self::webfinger($path, $type);
 712                         }
 713
 714                         // Mastodon needs to have it with "acct:"
 715                         if (!$webfinger) {
 716                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 717                                 $webfinger = self::webfinger($path, $type);
 718                         }
 719                 }
 720
 721                 if (!$webfinger) {
 722                         return self::feed($uri);
 723                 }
 724
 725                 $result = [];
 726
 727                 Logger::info("Probing", ['uri' => $uri]);
 728
 729                 if (in_array($network, ["", Protocol::DFRN])) {
 730                         $result = self::dfrn($webfinger);
 731                 }
 732                 if ((!$result && ($network == "")) || ($network == Protocol::DIASPORA)) {
 733                         $result = self::diaspora($webfinger);
 734                 }
 735                 if ((!$result && ($network == "")) || ($network == Protocol::OSTATUS)) {
 736                         $result = self::ostatus($webfinger);
 737                 }
 738                 if (in_array($network, ['', Protocol::ZOT])) {
 739                         $result = self::zot($webfinger, $result);
 740                 }
 741                 if ((!$result && ($network == "")) || ($network == Protocol::PUMPIO)) {
 742                         $result = self::pumpio($webfinger, $addr);
 743                 }
 744                 if ((!$result && ($network == "")) || ($network == Protocol::FEED)) {
 745                         $result = self::feed($uri);
 746                 } else {
 747                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 748                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 749                         if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
 750                                 $result["nick"] = $nick;
 751                         }
 752
 753                         if (empty($result["addr"]) && ($addr != "")) {
 754                                 $result["addr"] = $addr;
 755                         }
 756                 }
 757
 758                 $result = self::getSubscribeLink($result, $webfinger);
 759
 760                 if (empty($result["network"])) {
 761                         $result["network"] = Protocol::PHANTOM;
 762                 }
 763
 764                 if (empty($result["url"])) {
 765                         $result["url"] = $uri;
 766                 }
 767
 768                 Logger::log($uri." is ".$result["network"], Logger::DEBUG);
 769
 770                 if (empty($result["baseurl"]) && ($result["network"] != Protocol::PHANTOM)) {
 771                         $pos = strpos($result["url"], $host);
 772                         if ($pos) {
 773                                 $result["baseurl"] = substr($result["url"], 0, $pos).$host;
 774                         }
 775                 }
 776
 777                 return $result;
 778         }
 779
 780         /**
 781          * Check for Zot contact
 782          *
 783          * @param array $webfinger Webfinger data
 784          * @param array $data      previously probed data
 785          *
 786          * @return array Zot data
 787          * @throws HTTPException\InternalServerErrorException
 788          */
 789         private static function zot($webfinger, $data)
 790         {
 791                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
 792                         foreach ($webfinger["aliases"] as $alias) {
 793                                 if (substr($alias, 0, 5) == 'acct:') {
 794                                         $data["addr"] = substr($alias, 5);
 795                                 }
 796                         }
 797                 }
 798
 799                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
 800                         $data["addr"] = substr($webfinger["subject"], 5);
 801                 }
 802
 803                 $zot_url = '';
 804                 foreach ($webfinger['links'] as $link) {
 805                         if (($link['rel'] == 'http://purl.org/zot/protocol') && !empty($link['href'])) {
 806                                 $zot_url = $link['href'];
 807                         }
 808                 }
 809
 810                 if (empty($zot_url) && !empty($data['addr']) && !empty(self::$baseurl)) {
 811                         $condition = ['nurl' => Strings::normaliseLink(self::$baseurl), 'platform' => ['hubzilla']];
 812                         if (!DBA::exists('gserver', $condition)) {
 813                                 return $data;
 814                         }
 815                         $zot_url = self::$baseurl . '/.well-known/zot-info?address=' . $data['addr'];
 816                 }
 817
 818                 if (empty($zot_url)) {
 819                         return $data;
 820                 }
 821
 822                 $data = self::pollZot($zot_url, $data);
 823
 824                 if (!empty($data['url']) && !empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
 825                         foreach ($webfinger['aliases'] as $alias) {
 826                                 if (!strstr($alias, '@') && Strings::normaliseLink($alias) != Strings::normaliseLink($data['url'])) {
 827                                         $data['alias'] = $alias;
 828                                 }
 829                         }
 830                 }
 831
 832                 return $data;
 833         }
 834
 835         public static function pollZot($url, $data)
 836         {
 837                 $curlResult = Network::curl($url);
 838                 if ($curlResult->isTimeout()) {
 839                         return $data;
 840                 }
 841                 $content = $curlResult->getBody();
 842                 if (!$content) {
 843                         return $data;
 844                 }
 845
 846                 $json = json_decode($content, true);
 847                 if (!is_array($json)) {
 848                         return $data;
 849                 }
 850
 851                 if (empty($data['network'])) {
 852                         if (!empty($json['protocols']) && in_array('zot', $json['protocols'])) {
 853                                 $data['network'] = Protocol::ZOT;
 854                         } elseif (!isset($json['protocols'])) {
 855                                 $data['network'] = Protocol::ZOT;
 856                         }
 857                 }
 858
 859                 if (!empty($json['guid']) && empty($data['guid'])) {
 860                         $data['guid'] = $json['guid'];
 861                 }
 862                 if (!empty($json['key']) && empty($data['pubkey'])) {
 863                         $data['pubkey'] = $json['key'];
 864                 }
 865                 if (!empty($json['name'])) {
 866                         $data['name'] = $json['name'];
 867                 }
 868                 if (!empty($json['photo'])) {
 869                         $data['photo'] = $json['photo'];
 870                         if (!empty($json['photo_updated'])) {
 871                                 $data['photo'] .= '?rev=' . urlencode($json['photo_updated']);
 872                         }
 873                 }
 874                 if (!empty($json['address'])) {
 875                         $data['addr'] = $json['address'];
 876                 }
 877                 if (!empty($json['url'])) {
 878                         $data['url'] = $json['url'];
 879                 }
 880                 if (!empty($json['connections_url'])) {
 881                         $data['poco'] = $json['connections_url'];
 882                 }
 883                 if (isset($json['searchable'])) {
 884                         $data['hide'] = !$json['searchable'];
 885                 }
 886                 if (!empty($json['public_forum'])) {
 887                         $data['community'] = $json['public_forum'];
 888                         $data['account-type'] = Contact::PAGE_COMMUNITY;
 889                 }
 890
 891                 if (!empty($json['profile'])) {
 892                         $profile = $json['profile'];
 893                         if (!empty($profile['description'])) {
 894                                 $data['about'] = $profile['description'];
 895                         }
 896                         if (!empty($profile['keywords'])) {
 897                                 $keywords = implode(', ', $profile['keywords']);
 898                                 if (!empty($keywords)) {
 899                                         $data['keywords'] = $keywords;
 900                                 }
 901                         }
 902
 903                         $loc = [];
 904                         if (!empty($profile['region'])) {
 905                                 $loc['region'] = $profile['region'];
 906                         }
 907                         if (!empty($profile['country'])) {
 908                                 $loc['country-name'] = $profile['country'];
 909                         }
 910                         $location = Profile::formatLocation($loc);
 911                         if (!empty($location)) {
 912                                 $data['location'] = $location;
 913                         }
 914                 }
 915
 916                 return $data;
 917         }
 918
 919         /**
 920          * Perform a webfinger request.
 921          *
 922          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 923          *
 924          * @param string $url  Address that should be probed
 925          * @param string $type type
 926          *
 927          * @return array webfinger data
 928          * @throws HTTPException\InternalServerErrorException
 929          */
 930         public static function webfinger($url, $type)
 931         {
 932                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 933
 934                 $curlResult = Network::curl($url, false, ['timeout' => $xrd_timeout, 'accept_content' => $type]);
 935                 if ($curlResult->isTimeout()) {
 936                         self::$istimeout = true;
 937                         return [];
 938                 }
 939                 $data = $curlResult->getBody();
 940
 941                 $webfinger = json_decode($data, true);
 942                 if (!empty($webfinger)) {
 943                         if (!isset($webfinger["links"])) {
 944                                 Logger::log("No json webfinger links for ".$url, Logger::DEBUG);
 945                                 return [];
 946                         }
 947                         return $webfinger;
 948                 }
 949
 950                 // If it is not JSON, maybe it is XML
 951                 $xrd = XML::parseString($data, true);
 952                 if (!is_object($xrd)) {
 953                         Logger::log("No webfinger data retrievable for ".$url, Logger::DEBUG);
 954                         return [];
 955                 }
 956
 957                 $xrd_arr = XML::elementToArray($xrd);
 958                 if (!isset($xrd_arr["xrd"]["link"])) {
 959                         Logger::log("No XML webfinger links for ".$url, Logger::DEBUG);
 960                         return [];
 961                 }
 962
 963                 $webfinger = [];
 964
 965                 if (!empty($xrd_arr["xrd"]["subject"])) {
 966                         $webfinger["subject"] = $xrd_arr["xrd"]["subject"];
 967                 }
 968
 969                 if (!empty($xrd_arr["xrd"]["alias"])) {
 970                         $webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
 971                 }
 972
 973                 $webfinger["links"] = [];
 974
 975                 foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
 976                         if (!empty($data["@attributes"])) {
 977                                 $attributes = $data["@attributes"];
 978                         } elseif ($value == "@attributes") {
 979                                 $attributes = $data;
 980                         } else {
 981                                 continue;
 982                         }
 983
 984                         $webfinger["links"][] = $attributes;
 985                 }
 986                 return $webfinger;
 987         }
 988
 989         /**
 990          * Poll the Friendica specific noscrape page.
 991          *
 992          * "noscrape" is a faster alternative to fetch the data from the hcard.
 993          * This functionality was originally created for the directory.
 994          *
 995          * @param string $noscrape_url Link to the noscrape page
 996          * @param array  $data         The already fetched data
 997          *
 998          * @return array noscrape data
 999          * @throws HTTPException\InternalServerErrorException
1000          */
1001         private static function pollNoscrape($noscrape_url, $data)
1002         {
1003                 $curlResult = Network::curl($noscrape_url);
1004                 if ($curlResult->isTimeout()) {
1005                         self::$istimeout = true;
1006                         return [];
1007                 }
1008                 $content = $curlResult->getBody();
1009                 if (!$content) {
1010                         Logger::log("Empty body for ".$noscrape_url, Logger::DEBUG);
1011                         return [];
1012                 }
1013
1014                 $json = json_decode($content, true);
1015                 if (!is_array($json)) {
1016                         Logger::log("No json data for ".$noscrape_url, Logger::DEBUG);
1017                         return [];
1018                 }
1019
1020                 if (!empty($json["fn"])) {
1021                         $data["name"] = $json["fn"];
1022                 }
1023
1024                 if (!empty($json["addr"])) {
1025                         $data["addr"] = $json["addr"];
1026                 }
1027
1028                 if (!empty($json["nick"])) {
1029                         $data["nick"] = $json["nick"];
1030                 }
1031
1032                 if (!empty($json["guid"])) {
1033                         $data["guid"] = $json["guid"];
1034                 }
1035
1036                 if (!empty($json["comm"])) {
1037                         $data["community"] = $json["comm"];
1038                 }
1039
1040                 if (!empty($json["tags"])) {
1041                         $keywords = implode(", ", $json["tags"]);
1042                         if ($keywords != "") {
1043                                 $data["keywords"] = $keywords;
1044                         }
1045                 }
1046
1047                 $location = Profile::formatLocation($json);
1048                 if ($location) {
1049                         $data["location"] = $location;
1050                 }
1051
1052                 if (!empty($json["about"])) {
1053                         $data["about"] = $json["about"];
1054                 }
1055
1056                 if (!empty($json["key"])) {
1057                         $data["pubkey"] = $json["key"];
1058                 }
1059
1060                 if (!empty($json["photo"])) {
1061                         $data["photo"] = $json["photo"];
1062                 }
1063
1064                 if (!empty($json["dfrn-request"])) {
1065                         $data["request"] = $json["dfrn-request"];
1066                 }
1067
1068                 if (!empty($json["dfrn-confirm"])) {
1069                         $data["confirm"] = $json["dfrn-confirm"];
1070                 }
1071
1072                 if (!empty($json["dfrn-notify"])) {
1073                         $data["notify"] = $json["dfrn-notify"];
1074                 }
1075
1076                 if (!empty($json["dfrn-poll"])) {
1077                         $data["poll"] = $json["dfrn-poll"];
1078                 }
1079
1080                 if (isset($json["hide"])) {
1081                         $data["hide"] = (bool)$json["hide"];
1082                 } else {
1083                         $data["hide"] = false;
1084                 }
1085
1086                 return $data;
1087         }
1088
1089         /**
1090          * Check for valid DFRN data
1091          *
1092          * @param array $data DFRN data
1093          *
1094          * @return int Number of errors
1095          */
1096         public static function validDfrn($data)
1097         {
1098                 $errors = 0;
1099                 if (!isset($data['key'])) {
1100                         $errors ++;
1101                 }
1102                 if (!isset($data['dfrn-request'])) {
1103                         $errors ++;
1104                 }
1105                 if (!isset($data['dfrn-confirm'])) {
1106                         $errors ++;
1107                 }
1108                 if (!isset($data['dfrn-notify'])) {
1109                         $errors ++;
1110                 }
1111                 if (!isset($data['dfrn-poll'])) {
1112                         $errors ++;
1113                 }
1114                 return $errors;
1115         }
1116
1117         /**
1118          * Fetch data from a DFRN profile page and via "noscrape"
1119          *
1120          * @param string $profile_link Link to the profile page
1121          *
1122          * @return array profile data
1123          * @throws HTTPException\InternalServerErrorException
1124          * @throws \ImagickException
1125          */
1126         public static function profile($profile_link)
1127         {
1128                 $data = [];
1129
1130                 Logger::log("Check profile ".$profile_link, Logger::DEBUG);
1131
1132                 // Fetch data via noscrape - this is faster
1133                 $noscrape_url = str_replace(["/hcard/", "/profile/"], "/noscrape/", $profile_link);
1134                 $data = self::pollNoscrape($noscrape_url, $data);
1135
1136                 if (!isset($data["notify"])
1137                         || !isset($data["confirm"])
1138                         || !isset($data["request"])
1139                         || !isset($data["poll"])
1140                         || !isset($data["name"])
1141                         || !isset($data["photo"])
1142                 ) {
1143                         $data = self::pollHcard($profile_link, $data, true);
1144                 }
1145
1146                 $prof_data = [];
1147
1148                 if (empty($data["addr"]) || empty($data["nick"])) {
1149                         $probe_data = self::uri($profile_link);
1150                         $data["addr"] = ($data["addr"] ?? '') ?: $probe_data["addr"];
1151                         $data["nick"] = ($data["nick"] ?? '') ?: $probe_data["nick"];
1152                 }
1153
1154                 $prof_data["addr"]         = $data["addr"];
1155                 $prof_data["nick"]         = $data["nick"];
1156                 $prof_data["dfrn-request"] = $data['request'] ?? null;
1157                 $prof_data["dfrn-confirm"] = $data['confirm'] ?? null;
1158                 $prof_data["dfrn-notify"]  = $data['notify']  ?? null;
1159                 $prof_data["dfrn-poll"]    = $data['poll']    ?? null;
1160                 $prof_data["photo"]        = $data['photo']   ?? null;
1161                 $prof_data["fn"]           = $data['name']    ?? null;
1162                 $prof_data["key"]          = $data['pubkey']  ?? null;
1163
1164                 Logger::log("Result for profile ".$profile_link.": ".print_r($prof_data, true), Logger::DEBUG);
1165
1166                 return $prof_data;
1167         }
1168
1169         /**
1170          * Check for DFRN contact
1171          *
1172          * @param array $webfinger Webfinger data
1173          *
1174          * @return array DFRN data
1175          * @throws HTTPException\InternalServerErrorException
1176          */
1177         private static function dfrn($webfinger)
1178         {
1179                 $hcard_url = "";
1180                 $data = [];
1181                 // The array is reversed to take into account the order of preference for same-rel links
1182                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1183                 foreach (array_reverse($webfinger["links"]) as $link) {
1184                         if (($link["rel"] == ActivityNamespace::DFRN) && !empty($link["href"])) {
1185                                 $data["network"] = Protocol::DFRN;
1186                         } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1187                                 $data["poll"] = $link["href"];
1188                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
1189                                 $data["url"] = $link["href"];
1190                         } elseif (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1191                                 $hcard_url = $link["href"];
1192                         } elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
1193                                 $data["poco"] = $link["href"];
1194                         } elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && !empty($link["href"])) {
1195                                 $data["photo"] = $link["href"];
1196                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1197                                 $data["baseurl"] = trim($link["href"], '/');
1198                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1199                                 $data["guid"] = $link["href"];
1200                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1201                                 $data["pubkey"] = base64_decode($link["href"]);
1202
1203                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1204                                 if (strstr($data["pubkey"], 'RSA ')) {
1205                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1206                                 }
1207                         }
1208                 }
1209
1210                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1211                         foreach ($webfinger["aliases"] as $alias) {
1212                                 if (empty($data["url"]) && !strstr($alias, "@")) {
1213                                         $data["url"] = $alias;
1214                                 } elseif (!strstr($alias, "@") && Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"])) {
1215                                         $data["alias"] = $alias;
1216                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1217                                         $data["addr"] = substr($alias, 5);
1218                                 }
1219                         }
1220                 }
1221
1222                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
1223                         $data["addr"] = substr($webfinger["subject"], 5);
1224                 }
1225
1226                 if (!isset($data["network"]) || ($hcard_url == "")) {
1227                         return [];
1228                 }
1229
1230                 // Fetch data via noscrape - this is faster
1231                 $noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
1232                 $data = self::pollNoscrape($noscrape_url, $data);
1233
1234                 if (isset($data["notify"])
1235                         && isset($data["confirm"])
1236                         && isset($data["request"])
1237                         && isset($data["poll"])
1238                         && isset($data["name"])
1239                         && isset($data["photo"])
1240                 ) {
1241                         return $data;
1242                 }
1243
1244                 $data = self::pollHcard($hcard_url, $data, true);
1245
1246                 return $data;
1247         }
1248
1249         /**
1250          * Poll the hcard page (Diaspora and Friendica specific)
1251          *
1252          * @param string  $hcard_url Link to the hcard page
1253          * @param array   $data      The already fetched data
1254          * @param boolean $dfrn      Poll DFRN specific data
1255          *
1256          * @return array hcard data
1257          * @throws HTTPException\InternalServerErrorException
1258          */
1259         private static function pollHcard($hcard_url, $data, $dfrn = false)
1260         {
1261                 $curlResult = Network::curl($hcard_url);
1262                 if ($curlResult->isTimeout()) {
1263                         self::$istimeout = true;
1264                         return [];
1265                 }
1266                 $content = $curlResult->getBody();
1267                 if (!$content) {
1268                         return [];
1269                 }
1270
1271                 $doc = new DOMDocument();
1272                 if (!@$doc->loadHTML($content)) {
1273                         return [];
1274                 }
1275
1276                 $xpath = new DomXPath($doc);
1277
1278                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1279                 if (!is_object($vcards)) {
1280                         return [];
1281                 }
1282
1283                 if (!isset($data["baseurl"])) {
1284                         $data["baseurl"] = "";
1285                 }
1286
1287                 if ($vcards->length > 0) {
1288                         $vcard = $vcards->item(0);
1289
1290                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1291                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1292                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1293                         if (($search->length > 0) && empty($data["guid"])) {
1294                                 $data["guid"] = $search->item(0)->nodeValue;
1295                         }
1296
1297                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1298                         if ($search->length > 0) {
1299                                 $data["nick"] = $search->item(0)->nodeValue;
1300                         }
1301
1302                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1303                         if ($search->length > 0) {
1304                                 $data["name"] = $search->item(0)->nodeValue;
1305                         }
1306
1307                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1308                         if ($search->length > 0) {
1309                                 $data["searchable"] = $search->item(0)->nodeValue;
1310                         }
1311
1312                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1313                         if ($search->length > 0) {
1314                                 $data["pubkey"] = $search->item(0)->nodeValue;
1315                                 if (strstr($data["pubkey"], 'RSA ')) {
1316                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1317                                 }
1318                         }
1319
1320                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1321                         if ($search->length > 0) {
1322                                 $data["baseurl"] = trim($search->item(0)->nodeValue, "/");
1323                         }
1324                 }
1325
1326                 $avatar = [];
1327                 if (!empty($vcard)) {
1328                         $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1329                         foreach ($photos as $photo) {
1330                                 $attr = [];
1331                                 foreach ($photo->attributes as $attribute) {
1332                                         $attr[$attribute->name] = trim($attribute->value);
1333                                 }
1334
1335                                 if (isset($attr["src"]) && isset($attr["width"])) {
1336                                         $avatar[$attr["width"]] = $attr["src"];
1337                                 }
1338
1339                                 // We don't have a width. So we just take everything that we got.
1340                                 // This is a Hubzilla workaround which doesn't send a width.
1341                                 if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
1342                                         $avatar[] = $attr["src"];
1343                                 }
1344                         }
1345                 }
1346
1347                 if (sizeof($avatar)) {
1348                         ksort($avatar);
1349                         $data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
1350                 }
1351
1352                 if ($dfrn) {
1353                         // Poll DFRN specific data
1354                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1355                         if ($search->length > 0) {
1356                                 foreach ($search as $link) {
1357                                         //$data["request"] = $search->item(0)->nodeValue;
1358                                         $attr = [];
1359                                         foreach ($link->attributes as $attribute) {
1360                                                 $attr[$attribute->name] = trim($attribute->value);
1361                                         }
1362
1363                                         $data[substr($attr["rel"], 5)] = $attr["href"];
1364                                 }
1365                         }
1366
1367                         // Older Friendica versions had used the "uid" field differently than newer versions
1368                         if (!empty($data["nick"]) && !empty($data["guid"]) && ($data["nick"] == $data["guid"])) {
1369                                 unset($data["guid"]);
1370                         }
1371                 }
1372
1373
1374                 return $data;
1375         }
1376
1377         /**
1378          * Check for Diaspora contact
1379          *
1380          * @param array $webfinger Webfinger data
1381          *
1382          * @return array Diaspora data
1383          * @throws HTTPException\InternalServerErrorException
1384          */
1385         private static function diaspora($webfinger)
1386         {
1387                 $hcard_url = "";
1388                 $data = [];
1389
1390                 // The array is reversed to take into account the order of preference for same-rel links
1391                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1392                 foreach (array_reverse($webfinger["links"]) as $link) {
1393                         if (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1394                                 $hcard_url = $link["href"];
1395                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1396                                 $data["baseurl"] = trim($link["href"], '/');
1397                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1398                                 $data["guid"] = $link["href"];
1399                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (($link["type"] ?? "") == "text/html") && !empty($link["href"])) {
1400                                 $data["url"] = $link["href"];
1401                         } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1402                                 $data["poll"] = $link["href"];
1403                         } elseif (($link["rel"] == ActivityNamespace::POCO) && !empty($link["href"])) {
1404                                 $data["poco"] = $link["href"];
1405                         } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1406                                 $data["notify"] = $link["href"];
1407                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1408                                 $data["pubkey"] = base64_decode($link["href"]);
1409
1410                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1411                                 if (strstr($data["pubkey"], 'RSA ')) {
1412                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1413                                 }
1414                         }
1415                 }
1416
1417                 if (empty($data["url"]) || empty($hcard_url)) {
1418                         return [];
1419                 }
1420
1421                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1422                         foreach ($webfinger["aliases"] as $alias) {
1423                                 if (Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"]) && ! strstr($alias, "@")) {
1424                                         $data["alias"] = $alias;
1425                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1426                                         $data["addr"] = substr($alias, 5);
1427                                 }
1428                         }
1429                 }
1430
1431                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
1432                         $data["addr"] = substr($webfinger["subject"], 5);
1433                 }
1434
1435                 // Fetch further information from the hcard
1436                 $data = self::pollHcard($hcard_url, $data);
1437
1438                 if (!$data) {
1439                         return [];
1440                 }
1441
1442                 if (!empty($data["url"])
1443                         && !empty($data["guid"])
1444                         && !empty($data["baseurl"])
1445                         && !empty($data["pubkey"])
1446                         && !empty($hcard_url)
1447                 ) {
1448                         $data["network"] = Protocol::DIASPORA;
1449
1450                         // The Diaspora handle must always be lowercase
1451                         if (!empty($data["addr"])) {
1452                                 $data["addr"] = strtolower($data["addr"]);
1453                         }
1454
1455                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1456                         $data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
1457                         $data["batch"]  = $data["baseurl"] . "/receive/public";
1458                 } else {
1459                         return [];
1460                 }
1461
1462                 return $data;
1463         }
1464
1465         /**
1466          * Check for OStatus contact
1467          *
1468          * @param array $webfinger Webfinger data
1469          * @param bool  $short     Short detection mode
1470          *
1471          * @return array|bool OStatus data or "false" on error or "true" on short mode
1472          * @throws HTTPException\InternalServerErrorException
1473          */
1474         private static function ostatus($webfinger, $short = false)
1475         {
1476                 $data = [];
1477
1478                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1479                         foreach ($webfinger["aliases"] as $alias) {
1480                                 if (strstr($alias, "@") && !strstr(Strings::normaliseLink($alias), "http://")) {
1481                                         $data["addr"] = str_replace('acct:', '', $alias);
1482                                 }
1483                         }
1484                 }
1485
1486                 if (!empty($webfinger["subject"]) && strstr($webfinger["subject"], "@")
1487                         && !strstr(Strings::normaliseLink($webfinger["subject"]), "http://")
1488                 ) {
1489                         $data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
1490                 }
1491
1492                 if (!empty($webfinger["links"])) {
1493                         // The array is reversed to take into account the order of preference for same-rel links
1494                         // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1495                         foreach (array_reverse($webfinger["links"]) as $link) {
1496                                 if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1497                                         && (($link["type"] ?? "") == "text/html")
1498                                         && ($link["href"] != "")
1499                                 ) {
1500                                         $data["url"] = $link["href"];
1501                                 } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1502                                         $data["notify"] = $link["href"];
1503                                 } elseif (($link["rel"] == ActivityNamespace::FEED) && !empty($link["href"])) {
1504                                         $data["poll"] = $link["href"];
1505                                 } elseif (($link["rel"] == "magic-public-key") && !empty($link["href"])) {
1506                                         $pubkey = $link["href"];
1507
1508                                         if (substr($pubkey, 0, 5) === 'data:') {
1509                                                 if (strstr($pubkey, ',')) {
1510                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1511                                                 } else {
1512                                                         $pubkey = substr($pubkey, 5);
1513                                                 }
1514                                         } elseif (Strings::normaliseLink($pubkey) == 'http://') {
1515                                                 $curlResult = Network::curl($pubkey);
1516                                                 if ($curlResult->isTimeout()) {
1517                                                         self::$istimeout = true;
1518                                                         return $short ? false : [];
1519                                                 }
1520                                                 $pubkey = $curlResult->getBody();
1521                                         }
1522
1523                                         $key = explode(".", $pubkey);
1524
1525                                         if (sizeof($key) >= 3) {
1526                                                 $m = Strings::base64UrlDecode($key[1]);
1527                                                 $e = Strings::base64UrlDecode($key[2]);
1528                                                 $data["pubkey"] = Crypto::meToPem($m, $e);
1529                                         }
1530                                 }
1531                         }
1532                 }
1533
1534                 if (isset($data["notify"]) && isset($data["pubkey"])
1535                         && isset($data["poll"])
1536                         && isset($data["url"])
1537                 ) {
1538                         $data["network"] = Protocol::OSTATUS;
1539                 } else {
1540                         return $short ? false : [];
1541                 }
1542
1543                 if ($short) {
1544                         return true;
1545                 }
1546
1547                 // Fetch all additional data from the feed
1548                 $curlResult = Network::curl($data["poll"]);
1549                 if ($curlResult->isTimeout()) {
1550                         self::$istimeout = true;
1551                         return [];
1552                 }
1553                 $feed = $curlResult->getBody();
1554                 $feed_data = Feed::import($feed);
1555                 if (!$feed_data) {
1556                         return [];
1557                 }
1558
1559                 if (!empty($feed_data["header"]["author-name"])) {
1560                         $data["name"] = $feed_data["header"]["author-name"];
1561                 }
1562                 if (!empty($feed_data["header"]["author-nick"])) {
1563                         $data["nick"] = $feed_data["header"]["author-nick"];
1564                 }
1565                 if (!empty($feed_data["header"]["author-avatar"])) {
1566                         $data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
1567                 }
1568                 if (!empty($feed_data["header"]["author-id"])) {
1569                         $data["alias"] = $feed_data["header"]["author-id"];
1570                 }
1571                 if (!empty($feed_data["header"]["author-location"])) {
1572                         $data["location"] = $feed_data["header"]["author-location"];
1573                 }
1574                 if (!empty($feed_data["header"]["author-about"])) {
1575                         $data["about"] = $feed_data["header"]["author-about"];
1576                 }
1577                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1578                 // So we take the value that we just fetched, although the other one worked as well
1579                 if (!empty($feed_data["header"]["author-link"])) {
1580                         $data["url"] = $feed_data["header"]["author-link"];
1581                 }
1582
1583                 if (($data['poll'] == $data['url']) && ($data["alias"] != '')) {
1584                         $data['url'] = $data["alias"];
1585                         $data["alias"] = '';
1586                 }
1587
1588                 /// @todo Fetch location and "about" from the feed as well
1589                 return $data;
1590         }
1591
1592         /**
1593          * Fetch data from a pump.io profile page
1594          *
1595          * @param string $profile_link Link to the profile page
1596          *
1597          * @return array profile data
1598          */
1599         private static function pumpioProfileData($profile_link)
1600         {
1601                 $curlResult = Network::curl($profile_link);
1602                 if (!$curlResult->isSuccess()) {
1603                         return [];
1604                 }
1605
1606                 $doc = new DOMDocument();
1607                 if (!@$doc->loadHTML($curlResult->getBody())) {
1608                         return [];
1609                 }
1610
1611                 $xpath = new DomXPath($doc);
1612
1613                 $data = [];
1614
1615                 $data["name"] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
1616
1617                 if ($data["name"] == '') {
1618                         // This is ugly - but pump.io doesn't seem to know a better way for it
1619                         $data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1620                         $pos = strpos($data["name"], chr(10));
1621                         if ($pos) {
1622                                 $data["name"] = trim(substr($data["name"], 0, $pos));
1623                         }
1624                 }
1625
1626                 $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-locality')]");
1627
1628                 if ($data["location"] == '') {
1629                         $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'location')]");
1630                 }
1631
1632                 $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-note')]");
1633
1634                 if ($data["about"] == '') {
1635                         $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'summary')]");
1636                 }
1637
1638                 $avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
1639                 if (!$avatar) {
1640                         $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1641                 }
1642                 if ($avatar) {
1643                         foreach ($avatar->attributes as $attribute) {
1644                                 if ($attribute->name == "src") {
1645                                         $data["photo"] = trim($attribute->value);
1646                                 }
1647                         }
1648                 }
1649
1650                 return $data;
1651         }
1652
1653         /**
1654          * Check for pump.io contact
1655          *
1656          * @param array  $webfinger Webfinger data
1657          * @param string $addr
1658          * @return array pump.io data
1659          */
1660         private static function pumpio($webfinger, $addr)
1661         {
1662                 $data = [];
1663                 // The array is reversed to take into account the order of preference for same-rel links
1664                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1665                 foreach (array_reverse($webfinger["links"]) as $link) {
1666                         if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1667                                 && (($link["type"] ?? "") == "text/html")
1668                                 && ($link["href"] != "")
1669                         ) {
1670                                 $data["url"] = $link["href"];
1671                         } elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
1672                                 $data["notify"] = $link["href"];
1673                         } elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
1674                                 $data["poll"] = $link["href"];
1675                         } elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
1676                                 $data["dialback"] = $link["href"];
1677                         }
1678                 }
1679                 if (isset($data["poll"]) && isset($data["notify"])
1680                         && isset($data["dialback"])
1681                         && isset($data["url"])
1682                 ) {
1683                         // by now we use these fields only for the network type detection
1684                         // So we unset all data that isn't used at the moment
1685                         unset($data["dialback"]);
1686
1687                         $data["network"] = Protocol::PUMPIO;
1688                 } else {
1689                         return [];
1690                 }
1691
1692                 $profile_data = self::pumpioProfileData($data["url"]);
1693
1694                 if (!$profile_data) {
1695                         return [];
1696                 }
1697
1698                 $data = array_merge($data, $profile_data);
1699
1700                 if (($addr != '') && ($data['name'] != '')) {
1701                         $name = trim(str_replace($addr, '', $data['name']));
1702                         if ($name != '') {
1703                                 $data['name'] = $name;
1704                         }
1705                 }
1706
1707                 return $data;
1708         }
1709
1710         /**
1711          * Check for twitter contact
1712          *
1713          * @param string $uri
1714          *
1715          * @return array twitter data
1716          */
1717         private static function twitter($uri)
1718         {
1719                 if (preg_match('=(.*)@twitter.com=i', $uri, $matches)) {
1720                         $nick = $matches[1];
1721                 } elseif (preg_match('=https?://twitter.com/(.*)=i', $uri, $matches)) {
1722                         $nick = $matches[1];
1723                 } else {
1724                         return [];
1725                 }
1726
1727                 $data = [];
1728                 $data['url'] = 'https://twitter.com/' . $nick;
1729                 $data['addr'] = $nick . '@twitter.com';
1730                 $data['nick'] = $data['name'] = $nick;
1731                 $data['network'] = Protocol::TWITTER;
1732                 $data['baseurl'] = 'https://twitter.com';
1733
1734                 $curlResult = Network::curl($data['url'], false);
1735                 if (!$curlResult->isSuccess()) {
1736                         return [];
1737                 }
1738
1739                 $body = $curlResult->getBody();
1740                 $doc = new DOMDocument();
1741                 @$doc->loadHTML($body);
1742                 $xpath = new DOMXPath($doc);
1743
1744                 $list = $xpath->query('//img[@class]');
1745                 foreach ($list as $node) {
1746                         $img_attr = [];
1747                         if ($node->attributes->length) {
1748                                 foreach ($node->attributes as $attribute) {
1749                                         $img_attr[$attribute->name] = $attribute->value;
1750                                 }
1751                         }
1752
1753                         if (empty($img_attr['class'])) {
1754                                 continue;
1755                         }
1756
1757                         if (strpos($img_attr['class'], 'ProfileAvatar-image') !== false) {
1758                                 if (!empty($img_attr['src'])) {
1759                                         $data['photo'] = $img_attr['src'];
1760                                 }
1761                                 if (!empty($img_attr['alt'])) {
1762                                         $data['name'] = $img_attr['alt'];
1763                                 }
1764                         }
1765                 }
1766
1767                 return $data;
1768         }
1769
1770         /**
1771          * Checks HTML page for RSS feed link
1772          *
1773          * @param string $url  Page link
1774          * @param string $body Page body string
1775          * @return string|false Feed link or false if body was invalid HTML document
1776          */
1777         public static function getFeedLink(string $url, string $body)
1778         {
1779                 $doc = new DOMDocument();
1780                 if (!@$doc->loadHTML($body)) {
1781                         return false;
1782                 }
1783
1784                 $xpath = new DOMXPath($doc);
1785
1786                 $feedUrl = $xpath->evaluate('string(/html/head/link[@type="application/rss+xml" and @rel="alternate"]/@href)');
1787
1788                 $feedUrl = $feedUrl ? self::ensureAbsoluteLinkFromHTMLDoc($feedUrl, $url, $xpath) : '';
1789
1790                 return $feedUrl;
1791         }
1792
1793         /**
1794          * Return an absolute URL in the context of a HTML document retrieved from the provided URL.
1795          *
1796          * Loosely based on RFC 1808
1797          *
1798          * @see https://tools.ietf.org/html/rfc1808
1799          *
1800          * @param string   $href  The potential relative href found in the HTML document
1801          * @param string   $base  The HTML document URL
1802          * @param DOMXPath $xpath The HTML document XPath
1803          * @return string
1804          */
1805         private static function ensureAbsoluteLinkFromHTMLDoc(string $href, string $base, DOMXPath $xpath)
1806         {
1807                 if (filter_var($href, FILTER_VALIDATE_URL)) {
1808                         return $href;
1809                 }
1810
1811                 $base = $xpath->evaluate('string(/html/head/base/@href)') ?: $base;
1812
1813                 $baseParts = parse_url($base);
1814
1815                 // Naked domain case (scheme://basehost)
1816                 $path = $baseParts['path'] ?? '/';
1817
1818                 // Remove the filename part of the path if it exists (/base/path/file)
1819                 $path = implode('/', array_slice(explode('/', $path), 0, -1));
1820
1821                 $hrefParts = parse_url($href);
1822
1823                 // Root path case (/path) including relative scheme case (//host/path)
1824                 if ($hrefParts['path'] && $hrefParts['path'][0] == '/') {
1825                         $path = $hrefParts['path'];
1826                 } else {
1827                         $path = $path . '/' . $hrefParts['path'];
1828
1829                         // Resolve arbitrary relative path
1830                         // Lifted from https://www.php.net/manual/en/function.realpath.php#84012
1831                         $parts = array_filter(explode('/', $path), 'strlen');
1832                         $absolutes = array();
1833                         foreach ($parts as $part) {
1834                                 if ('.' == $part) continue;
1835                                 if ('..' == $part) {
1836                                         array_pop($absolutes);
1837                                 } else {
1838                                         $absolutes[] = $part;
1839                                 }
1840                         }
1841
1842                         $path = '/' . implode('/', $absolutes);
1843                 }
1844
1845                 // Relative scheme case (//host/path)
1846                 $baseParts['host'] = $hrefParts['host'] ?? $baseParts['host'];
1847                 $baseParts['path'] = $path;
1848                 unset($baseParts['query']);
1849                 unset($baseParts['fragment']);
1850
1851                 return Network::unparseURL($baseParts);
1852         }
1853
1854         /**
1855          * Check for feed contact
1856          *
1857          * @param string  $url   Profile link
1858          * @param boolean $probe Do a probe if the page contains a feed link
1859          *
1860          * @return array feed data
1861          * @throws HTTPException\InternalServerErrorException
1862          */
1863         private static function feed($url, $probe = true)
1864         {
1865                 $curlResult = Network::curl($url);
1866                 if ($curlResult->isTimeout()) {
1867                         self::$istimeout = true;
1868                         return [];
1869                 }
1870                 $feed = $curlResult->getBody();
1871                 $feed_data = Feed::import($feed);
1872
1873                 if (!$feed_data) {
1874                         if (!$probe) {
1875                                 return [];
1876                         }
1877
1878                         $feed_url = self::getFeedLink($url, $feed);
1879
1880                         if (!$feed_url) {
1881                                 return [];
1882                         }
1883
1884                         return self::feed($feed_url, false);
1885                 }
1886
1887                 if (!empty($feed_data["header"]["author-name"])) {
1888                         $data["name"] = $feed_data["header"]["author-name"];
1889                 }
1890
1891                 if (!empty($feed_data["header"]["author-nick"])) {
1892                         $data["nick"] = $feed_data["header"]["author-nick"];
1893                 }
1894
1895                 if (!empty($feed_data["header"]["author-avatar"])) {
1896                         $data["photo"] = $feed_data["header"]["author-avatar"];
1897                 }
1898
1899                 if (!empty($feed_data["header"]["author-id"])) {
1900                         $data["alias"] = $feed_data["header"]["author-id"];
1901                 }
1902
1903                 $data["url"] = $url;
1904                 $data["poll"] = $url;
1905
1906                 if (!empty($feed_data["header"]["author-link"])) {
1907                         $data["baseurl"] = $feed_data["header"]["author-link"];
1908                 } else {
1909                         $data["baseurl"] = $data["url"];
1910                 }
1911
1912                 $data["network"] = Protocol::FEED;
1913
1914                 return $data;
1915         }
1916
1917         /**
1918          * Check for mail contact
1919          *
1920          * @param string  $uri Profile link
1921          * @param integer $uid User ID
1922          *
1923          * @return array mail data
1924          * @throws \Exception
1925          */
1926         private static function mail($uri, $uid)
1927         {
1928                 if (!Network::isEmailDomainValid($uri)) {
1929                         return [];
1930                 }
1931
1932                 if ($uid == 0) {
1933                         return [];
1934                 }
1935
1936                 $user = DBA::selectFirst('user', ['prvkey'], ['uid' => $uid]);
1937
1938                 $condition = ["`uid` = ? AND `server` != ''", $uid];
1939                 $fields = ['pass', 'user', 'server', 'port', 'ssltype', 'mailbox'];
1940                 $mailacct = DBA::selectFirst('mailacct', $fields, $condition);
1941
1942                 if (!DBA::isResult($user) || !DBA::isResult($mailacct)) {
1943                         return [];
1944                 }
1945
1946                 $mailbox = Email::constructMailboxName($mailacct);
1947                 $password = '';
1948                 openssl_private_decrypt(hex2bin($mailacct['pass']), $password, $user['prvkey']);
1949                 $mbox = Email::connect($mailbox, $mailacct['user'], $password);
1950                 if (!$mbox) {
1951                         return [];
1952                 }
1953
1954                 $msgs = Email::poll($mbox, $uri);
1955                 Logger::log('searching '.$uri.', '.count($msgs).' messages found.', Logger::DEBUG);
1956
1957                 if (!count($msgs)) {
1958                         return [];
1959                 }
1960
1961                 $phost = substr($uri, strpos($uri, '@') + 1);
1962
1963                 $data = [];
1964                 $data["addr"]    = $uri;
1965                 $data["network"] = Protocol::MAIL;
1966                 $data["name"]    = substr($uri, 0, strpos($uri, '@'));
1967                 $data["nick"]    = $data["name"];
1968                 $data["photo"]   = Network::lookupAvatarByEmail($uri);
1969                 $data["url"]     = 'mailto:'.$uri;
1970                 $data["notify"]  = 'smtp ' . Strings::getRandomHex();
1971                 $data["poll"]    = 'email ' . Strings::getRandomHex();
1972
1973                 $x = Email::messageMeta($mbox, $msgs[0]);
1974                 if (stristr($x[0]->from, $uri)) {
1975                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1976                 } elseif (stristr($x[0]->to, $uri)) {
1977                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1978                 }
1979                 if (isset($adr)) {
1980                         foreach ($adr as $feadr) {
1981                                 if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
1982                                         &&(strcasecmp($feadr->host, $phost) == 0)
1983                                         && (strlen($feadr->personal))
1984                                 ) {
1985                                         $personal = imap_mime_header_decode($feadr->personal);
1986                                         $data["name"] = "";
1987                                         foreach ($personal as $perspart) {
1988                                                 if ($perspart->charset != "default") {
1989                                                         $data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1990                                                 } else {
1991                                                         $data["name"] .= $perspart->text;
1992                                                 }
1993                                         }
1994
1995                                         $data["name"] = Strings::escapeTags($data["name"]);
1996                                 }
1997                         }
1998                 }
1999                 if (!empty($mbox)) {
2000                         imap_close($mbox);
2001                 }
2002                 return $data;
2003         }
2004
2005         /**
2006          * Mix two paths together to possibly fix missing parts
2007          *
2008          * @param string $avatar Path to the avatar
2009          * @param string $base   Another path that is hopefully complete
2010          *
2011          * @return string fixed avatar path
2012          * @throws \Exception
2013          */
2014         public static function fixAvatar($avatar, $base)
2015         {
2016                 $base_parts = parse_url($base);
2017
2018                 // Remove all parts that could create a problem
2019                 unset($base_parts['path']);
2020                 unset($base_parts['query']);
2021                 unset($base_parts['fragment']);
2022
2023                 $avatar_parts = parse_url($avatar);
2024
2025                 // Now we mix them
2026                 $parts = array_merge($base_parts, $avatar_parts);
2027
2028                 // And put them together again
2029                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
2030                 $host     = isset($parts['host'])     ? $parts['host']           : '';
2031                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
2032                 $path     = isset($parts['path'])     ? $parts['path']           : '';
2033                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
2034                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
2035
2036                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
2037
2038                 Logger::log('Base: '.$base.' - Avatar: '.$avatar.' - Fixed: '.$fixed, Logger::DATA);
2039
2040                 return $fixed;
2041         }
2042 }