src/Network/Probe.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   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 Exception;
  27 use Friendica\Core\Hook;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\Contact;
  34 use Friendica\Model\GServer;
  35 use Friendica\Model\Profile;
  36 use Friendica\Model\User;
  37 use Friendica\Network\HTTPClient\Client\HttpClientAccept;
  38 use Friendica\Network\HTTPClient\Client\HttpClientOptions;
  39 use Friendica\Protocol\ActivityNamespace;
  40 use Friendica\Protocol\ActivityPub;
  41 use Friendica\Protocol\Diaspora;
  42 use Friendica\Protocol\Email;
  43 use Friendica\Protocol\Feed;
  44 use Friendica\Protocol\Salmon;
  45 use Friendica\Util\Crypto;
  46 use Friendica\Util\DateTimeFormat;
  47 use Friendica\Util\Network;
  48 use Friendica\Util\Strings;
  49 use Friendica\Util\XML;
  50 use GuzzleHttp\Psr7\Uri;
  51
  52 /**
  53  * This class contain functions for probing URL
  54  */
  55 class Probe
  56 {
  57         const HOST_META = '/.well-known/host-meta';
  58         const WEBFINGER = '/.well-known/webfinger?resource={uri}';
  59
  60         /**
  61          * @var string Base URL
  62          */
  63         private static $baseurl;
  64
  65         /**
  66          * @var boolean Whether a timeout has occured
  67          */
  68         private static $isTimeout;
  69
  70         /**
  71          * Checks if the provided network can be probed
  72          *
  73          * @param string $network
  74          *
  75          * @return boolean
  76          */
  77         public static function isProbable(string $network): bool
  78         {
  79                 return (in_array($network, array_merge(Protocol::FEDERATED, [Protocol::ZOT, Protocol::PHANTOM])));
  80         }
  81
  82         /**
  83          * Remove stuff from an URI that doesn't belong there
  84          *
  85          * @param string $rawUri
  86          * @return string Cleaned URI
  87          */
  88         public static function cleanURI(string $rawUri): string
  89         {
  90                 // At first remove leading and trailing junk
  91                 $rawUri = trim($rawUri, "@#?: \t\n\r\0\x0B");
  92
  93                 $rawUri = Network::convertToIdn($rawUri);
  94
  95                 $uri = new Uri($rawUri);
  96                 if (!$uri->getScheme()) {
  97                         return $uri->__toString();
  98                 }
  99
 100                 // Remove the URL fragment, since these shouldn't be part of any profile URL
 101                 $uri = $uri->withFragment('');
 102
 103                 return $uri->__toString();
 104         }
 105
 106         /**
 107          * Rearrange the array so that it always has the same order
 108          *
 109          * @param array $data Unordered data
 110          * @return array Ordered data
 111          */
 112         private static function rearrangeData(array $data): array
 113         {
 114                 $fields = ['name', 'given_name', 'family_name', 'nick', 'guid', 'url', 'addr', 'alias',
 115                         'photo', 'photo_medium', 'photo_small', 'header',
 116                                 'account-type', 'community', 'keywords', 'location', 'about', 'xmpp', 'matrix',
 117                                 'hide', 'batch', 'notify', 'poll', 'request', 'confirm', 'subscribe', 'poco',
 118                                 'following', 'followers', 'inbox', 'outbox', 'sharedinbox',
 119                                 'priority', 'network', 'pubkey', 'manually-approve', 'baseurl', 'gsid'];
 120
 121                 $numeric_fields = ['gsid', 'hide', 'account-type', 'manually-approve'];
 122
 123                 $newdata = [];
 124                 foreach ($fields as $field) {
 125                         if (isset($data[$field])) {
 126                                 if (in_array($field, $numeric_fields)) {
 127                                         $newdata[$field] = (int)$data[$field];
 128                                 } else {
 129                                         $newdata[$field] = trim($data[$field]);
 130                                 }
 131                         } elseif (!in_array($field, $numeric_fields)) {
 132                                 $newdata[$field] = '';
 133                         } else {
 134                                 $newdata[$field] = null;
 135                         }
 136                 }
 137
 138                 $newdata['networks'] = [];
 139                 foreach ([Protocol::DIASPORA, Protocol::OSTATUS] as $network) {
 140                         if (!empty($data['networks'][$network])) {
 141                                 $data['networks'][$network]['subscribe'] = $newdata['subscribe'] ?? '';
 142                                 if (empty($data['networks'][$network]['baseurl'])) {
 143                                         $data['networks'][$network]['baseurl'] = $newdata['baseurl'] ?? '';
 144                                 } else {
 145                                         $newdata['baseurl'] = $data['networks'][$network]['baseurl'];
 146                                 }
 147                                 if (!empty($newdata['baseurl'])) {
 148                                         $newdata['gsid'] = $data['networks'][$network]['gsid'] = GServer::getID($newdata['baseurl']);
 149                                 } else {
 150                                         $newdata['gsid'] = $data['networks'][$network]['gsid'] = null;
 151                                 }
 152
 153                                 $newdata['networks'][$network] = self::rearrangeData($data['networks'][$network]);
 154                                 unset($newdata['networks'][$network]['networks']);
 155                         }
 156                 }
 157
 158                 // We don't use the "priority" field anymore and replace it with a dummy.
 159                 $newdata['priority'] = 0;
 160
 161                 return $newdata;
 162         }
 163
 164         /**
 165          * Check if the hostname belongs to the own server
 166          *
 167          * @param string $host The hostname that is to be checked
 168          * @return bool Does the testes hostname belongs to the own server?
 169          */
 170         private static function ownHost(string $host): bool
 171         {
 172                 $own_host = DI::baseUrl()->getHostname();
 173
 174                 $parts = parse_url($host);
 175
 176                 if (!isset($parts['scheme'])) {
 177                         $parts = parse_url('http://' . $host);
 178                 }
 179
 180                 if (!isset($parts['host'])) {
 181                         return false;
 182                 }
 183                 return $parts['host'] == $own_host;
 184         }
 185
 186         /**
 187          * Probes for webfinger path via "host-meta"
 188          *
 189          * We have to check if the servers in the future still will offer this.
 190          * It seems as if it was dropped from the standard.
 191          *
 192          * @param string $host The host part of an url
 193          *
 194          * @return array with template and type of the webfinger template for JSON or XML
 195          * @throws HTTPException\InternalServerErrorException
 196          */
 197         private static function hostMeta(string $host): array
 198         {
 199                 // Reset the static variable
 200                 self::$baseurl = '';
 201
 202                 // Handles the case when the hostname contains the scheme
 203                 if (!parse_url($host, PHP_URL_SCHEME)) {
 204                         $ssl_url = 'https://' . $host . self::HOST_META;
 205                         $url = 'http://' . $host . self::HOST_META;
 206                 } else {
 207                         $ssl_url = $host . self::HOST_META;
 208                         $url = '';
 209                 }
 210
 211                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 212
 213                 Logger::info('Probing', ['host' => $host, 'ssl_url' => $ssl_url, 'url' => $url, 'callstack' => System::callstack(20)]);
 214                 $xrd = null;
 215
 216                 $curlResult = DI::httpClient()->get($ssl_url, HttpClientAccept::XRD_XML, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 217                 $ssl_connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 218                 if ($curlResult->isSuccess()) {
 219                         $xml = $curlResult->getBody();
 220                         $xrd = XML::parseString($xml, true);
 221                         if (!empty($url)) {
 222                                 $host_url = 'https://' . $host;
 223                         } else {
 224                                 $host_url = $host;
 225                         }
 226                 } elseif ($curlResult->isTimeout()) {
 227                         Logger::info('Probing timeout', ['url' => $ssl_url]);
 228                         self::$isTimeout = true;
 229                         return [];
 230                 }
 231
 232                 if (!is_object($xrd) && !empty($url)) {
 233                         $curlResult = DI::httpClient()->get($url, HttpClientAccept::XRD_XML, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 234                         $connection_error = ($curlResult->getErrorNumber() == CURLE_COULDNT_CONNECT) || ($curlResult->getReturnCode() == 0);
 235                         if ($curlResult->isTimeout()) {
 236                                 Logger::info('Probing timeout', ['url' => $url]);
 237                                 self::$isTimeout = true;
 238                                 return [];
 239                         } elseif ($connection_error && $ssl_connection_error) {
 240                                 self::$isTimeout = true;
 241                                 return [];
 242                         }
 243
 244                         $xml = $curlResult->getBody();
 245                         $xrd = XML::parseString($xml, true);
 246                         $host_url = 'http://'.$host;
 247                 }
 248                 if (!is_object($xrd)) {
 249                         Logger::info('No xrd object found', ['host' => $host]);
 250                         return [];
 251                 }
 252
 253                 $links = XML::elementToArray($xrd);
 254                 if (!isset($links['xrd']['link'])) {
 255                         Logger::info('No xrd data found', ['host' => $host]);
 256                         return [];
 257                 }
 258
 259                 $lrdd = [];
 260
 261                 foreach ($links['xrd']['link'] as $value => $link) {
 262                         if (!empty($link['@attributes'])) {
 263                                 $attributes = $link['@attributes'];
 264                         } elseif ($value == '@attributes') {
 265                                 $attributes = $link;
 266                         } else {
 267                                 continue;
 268                         }
 269
 270                         if (!empty($attributes['rel']) && $attributes['rel'] == 'lrdd' && !empty($attributes['template'])) {
 271                                 $type = (empty($attributes['type']) ? '' : $attributes['type']);
 272
 273                                 $lrdd[$type] = $attributes['template'];
 274                         }
 275                 }
 276
 277                 if (Network::isUrlBlocked($host_url)) {
 278                         Logger::info('Domain is blocked', ['url' => $host]);
 279                         return [];
 280                 }
 281
 282                 self::$baseurl = $host_url;
 283
 284                 Logger::info('Probing successful', ['host' => $host]);
 285
 286                 return $lrdd;
 287         }
 288
 289         /**
 290          * Check an URI for LRDD data
 291          *
 292          * @param string $uri     Address that should be probed
 293          * @return array uri data
 294          * @throws HTTPException\InternalServerErrorException
 295          */
 296         public static function lrdd(string $uri): array
 297         {
 298                 $data = self::getWebfingerArray($uri);
 299                 if (empty($data)) {
 300                         return [];
 301                 }
 302                 $webfinger = $data['webfinger'];
 303
 304                 if (empty($webfinger['links'])) {
 305                         Logger::info('No webfinger links found', ['uri' => $uri]);
 306                         return [];
 307                 }
 308
 309                 $data = [];
 310
 311                 foreach ($webfinger['links'] as $link) {
 312                         $data[] = ['@attributes' => $link];
 313                 }
 314
 315                 if (!empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
 316                         foreach ($webfinger['aliases'] as $alias) {
 317                                 $data[] = [
 318                                         '@attributes' => [
 319                                                 'rel' => 'alias',
 320                                                 'href' => $alias,
 321                                         ]
 322                                 ];
 323                         }
 324                 }
 325
 326                 return $data;
 327         }
 328
 329         /**
 330          * Fetch information (protocol endpoints and user information) about a given uri
 331          *
 332          * @param string  $uri     Address that should be probed
 333          * @param string  $network Test for this specific network
 334          * @param integer $uid     User ID for the probe (only used for mails)
 335          * @param boolean $cache   Use cached values?
 336          *
 337          * @return array uri data
 338          * @throws HTTPException\InternalServerErrorException
 339          * @throws \ImagickException
 340          */
 341         public static function uri(string $uri, string $network = '', int $uid = -1): array
 342         {
 343                 // Local profiles aren't probed via network
 344                 if (empty($network) && Contact::isLocal($uri)) {
 345                         $data = self::localProbe($uri);
 346                         if (!empty($data)) {
 347                                 return $data;
 348                         }
 349                 }
 350
 351                 if ($uid == -1) {
 352                         $uid = DI::userSession()->getLocalUserId();
 353                 }
 354
 355                 if (empty($network) || ($network == Protocol::ACTIVITYPUB)) {
 356                         $ap_profile = ActivityPub::probeProfile($uri);
 357                 } else {
 358                         $ap_profile = [];
 359                 }
 360
 361                 self::$isTimeout = false;
 362
 363                 if ($network != Protocol::ACTIVITYPUB) {
 364                         $data = self::detect($uri, $network, $uid, $ap_profile);
 365                         if (!is_array($data)) {
 366                                 $data = [];
 367                         }
 368                         if (empty($data) || (!empty($ap_profile) && empty($network) && (($data['network'] ?? '') != Protocol::DFRN))) {
 369                                 $networks = $data['networks'] ?? [];
 370                                 unset($data['networks']);
 371                                 if (!empty($data['network'])) {
 372                                         $networks[$data['network']] = $data;
 373                                 }
 374                                 $data = $ap_profile;
 375                                 $data['networks'] = $networks;
 376                         } elseif (!empty($ap_profile)) {
 377                                 $ap_profile['batch'] = '';
 378                                 $data = array_merge($ap_profile, $data);
 379                         }
 380                 } else {
 381                         $data = $ap_profile;
 382                 }
 383
 384                 if (!isset($data['url'])) {
 385                         $data['url'] = $uri;
 386                 }
 387
 388                 if (empty($data['photo'])) {
 389                         $data['photo'] = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
 390                 }
 391
 392                 if (empty($data['name'])) {
 393                         if (!empty($data['nick'])) {
 394                                 $data['name'] = $data['nick'];
 395                         }
 396
 397                         if (empty($data['name'])) {
 398                                 $data['name'] = $data['url'];
 399                         }
 400                 }
 401
 402                 if (empty($data['nick'])) {
 403                         $data['nick'] = strtolower($data['name']);
 404
 405                         if (strpos($data['nick'], ' ')) {
 406                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 407                         }
 408                 }
 409
 410                 if (!empty($data['baseurl']) && empty($data['gsid'])) {
 411                         $data['gsid'] = GServer::getID($data['baseurl']);
 412                 }
 413
 414                 if (empty($data['network'])) {
 415                         $data['network'] = Protocol::PHANTOM;
 416                 }
 417
 418                 // Ensure that local connections always are DFRN
 419                 if (($network == '') && ($data['network'] != Protocol::PHANTOM) && (self::ownHost($data['baseurl'] ?? '') || self::ownHost($data['url']))) {
 420                         $data['network'] = Protocol::DFRN;
 421                 }
 422
 423                 if (!isset($data['hide']) && in_array($data['network'], Protocol::FEDERATED)) {
 424                         $data['hide'] = self::getHideStatus($data['url']);
 425                 }
 426
 427                 return self::rearrangeData($data);
 428         }
 429
 430
 431         /**
 432          * Fetches the "hide" status from the profile
 433          *
 434          * @param string $url URL of the profile
 435          * @return boolean "hide" status
 436          */
 437         private static function getHideStatus(string $url): bool
 438         {
 439                 $curlResult = DI::httpClient()->get($url, HttpClientAccept::HTML, [HttpClientOptions::CONTENT_LENGTH => 1000000]);
 440                 if (!$curlResult->isSuccess()) {
 441                         return false;
 442                 }
 443
 444                 // If it isn't a HTML file then exit
 445                 if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
 446                         return false;
 447                 }
 448
 449                 $body = $curlResult->getBody();
 450                 if (empty($body)) {
 451                         return false;
 452                 }
 453
 454                 $doc = new DOMDocument();
 455                 @$doc->loadHTML($body);
 456
 457                 $xpath = new DOMXPath($doc);
 458
 459                 $list = $xpath->query('//meta[@name]');
 460                 foreach ($list as $node) {
 461                         $meta_tag = [];
 462                         if ($node->attributes->length) {
 463                                 foreach ($node->attributes as $attribute) {
 464                                         $meta_tag[$attribute->name] = $attribute->value;
 465                                 }
 466                         }
 467
 468                         if (empty($meta_tag['content'])) {
 469                                 continue;
 470                         }
 471
 472                         $content = strtolower(trim($meta_tag['content']));
 473
 474                         switch (strtolower(trim($meta_tag['name']))) {
 475                                 case 'dfrn-global-visibility':
 476                                         if ($content == 'false') {
 477                                                 return true;
 478                                         }
 479                                         break;
 480                                 case 'robots':
 481                                         if (strpos($content, 'noindex') !== false) {
 482                                                 return true;
 483                                         }
 484                                         break;
 485                         }
 486                 }
 487
 488                 return false;
 489         }
 490
 491         /**
 492          * Fetch the "subscribe" and add it to the result
 493          *
 494          * @param array $result Result array
 495          * @param array $webfinger Webfinger data
 496          *
 497          * @return array result Altered/unaltered result array
 498          */
 499         private static function getSubscribeLink(array $result, array $webfinger): array
 500         {
 501                 if (empty($webfinger['links'])) {
 502                         return $result;
 503                 }
 504
 505                 foreach ($webfinger['links'] as $link) {
 506                         if (!empty($link['template']) && ($link['rel'] === ActivityNamespace::OSTATUSSUB)) {
 507                                 $result['subscribe'] = $link['template'];
 508                         }
 509                 }
 510
 511                 return $result;
 512         }
 513
 514         /**
 515          * Get webfinger data from a given URI
 516          *
 517          * @param string $uri URI
 518          *
 519          * @return array Webfinger data
 520          * @throws HTTPException\InternalServerErrorException
 521          */
 522         private static function getWebfingerArray(string $uri): array
 523         {
 524                 $parts = parse_url($uri);
 525
 526                 if (!empty($parts['scheme']) && !empty($parts['host'])) {
 527                         $host = $parts['host'];
 528                         if (!empty($parts['port'])) {
 529                                 $host .= ':' . $parts['port'];
 530                         }
 531
 532                         $baseurl = $parts['scheme'] . '://' . $host;
 533
 534                         $nick = '';
 535                         $addr = '';
 536
 537                         $path_parts = explode('/', trim($parts['path'] ?? '', '/'));
 538                         if (!empty($path_parts)) {
 539                                 $nick = ltrim(end($path_parts), '@');
 540                                 $addr = $nick . '@' . $host;
 541                         }
 542
 543                         $webfinger = self::getWebfinger($parts['scheme'] . '://' . $host . self::WEBFINGER, HttpClientAccept::JRD_JSON, $uri, $addr);
 544                         if (empty($webfinger)) {
 545                                 $lrdd = self::hostMeta($host);
 546                         }
 547
 548                         if (empty($webfinger) && empty($lrdd)) {
 549                                 while (empty($lrdd) && empty($webfinger) && (sizeof($path_parts) > 1)) {
 550                                         $host    .= '/' . array_shift($path_parts);
 551                                         $baseurl = $parts['scheme'] . '://' . $host;
 552
 553                                         if (!empty($nick)) {
 554                                                 $addr = $nick . '@' . $host;
 555                                         }
 556
 557                                         $webfinger = self::getWebfinger($parts['scheme'] . '://' . $host . self::WEBFINGER, HttpClientAccept::JRD_JSON, $uri, $addr);
 558                                         if (empty($webfinger)) {
 559                                                 $lrdd = self::hostMeta($host);
 560                                         }
 561                                 }
 562
 563                                 if (empty($lrdd) && empty($webfinger)) {
 564                                         return [];
 565                                 }
 566                         }
 567                 } elseif (strstr($uri, '@')) {
 568                         // Remove "acct:" from the URI
 569                         $uri = str_replace('acct:', '', $uri);
 570
 571                         $host = substr($uri, strpos($uri, '@') + 1);
 572                         $nick = substr($uri, 0, strpos($uri, '@'));
 573                         $addr = $uri;
 574
 575                         $webfinger = self::getWebfinger('https://' . $host . self::WEBFINGER, HttpClientAccept::JRD_JSON, $uri, $addr);
 576                         if (self::$isTimeout) {
 577                                 return [];
 578                         }
 579
 580                         if (empty($webfinger)) {
 581                                 $webfinger = self::getWebfinger('http://' . $host . self::WEBFINGER, HttpClientAccept::JRD_JSON, $uri, $addr);
 582                                 if (self::$isTimeout) {
 583                                         return [];
 584                                 }
 585                         } else {
 586                                 $baseurl = 'https://' . $host;
 587                         }
 588
 589                         if (empty($webfinger)) {
 590                                 $lrdd = self::hostMeta($host);
 591                                 if (self::$isTimeout) {
 592                                         return [];
 593                                 }
 594                                 $baseurl = self::$baseurl;
 595                         } else {
 596                                 $baseurl = 'http://' . $host;
 597                         }
 598                 } else {
 599                         Logger::info('URI was not detectable', ['uri' => $uri]);
 600                         return [];
 601                 }
 602
 603                 if (empty($webfinger)) {
 604                         foreach ($lrdd as $type => $template) {
 605                                 if ($webfinger) {
 606                                         continue;
 607                                 }
 608
 609                                 $webfinger = self::getWebfinger($template, $type, $uri, $addr);
 610                         }
 611                 }
 612
 613                 if (empty($webfinger)) {
 614                         return [];
 615                 }
 616
 617                 if ($webfinger['detected'] == $addr) {
 618                         $webfinger['nick'] = $nick;
 619                         $webfinger['addr'] = $addr;
 620                 }
 621
 622                 $webfinger['baseurl'] = $baseurl;
 623
 624                 return $webfinger;
 625         }
 626
 627         /**
 628          * Perform network request for webfinger data
 629          *
 630          * @param string $template
 631          * @param string $type
 632          * @param string $uri
 633          * @param string $addr
 634          *
 635          * @return array webfinger results
 636          */
 637         private static function getWebfinger(string $template, string $type, string $uri, string $addr): array
 638         {
 639                 if (Network::isUrlBlocked($template)) {
 640                         Logger::info('Domain is blocked', ['url' => $template]);
 641                         return [];
 642                 }
 643
 644                 // First try the address because this is the primary purpose of webfinger
 645                 if (!empty($addr)) {
 646                         $detected = $addr;
 647                         $path = str_replace('{uri}', urlencode('acct:' . $addr), $template);
 648                         $webfinger = self::webfinger($path, $type);
 649                         if (self::$isTimeout) {
 650                                 return [];
 651                         }
 652                 }
 653
 654                 // Then try the URI
 655                 if (empty($webfinger) && $uri != $addr) {
 656                         $detected = $uri;
 657                         $path = str_replace('{uri}', urlencode($uri), $template);
 658                         $webfinger = self::webfinger($path, $type);
 659                         if (self::$isTimeout) {
 660                                 return [];
 661                         }
 662                 }
 663
 664                 if (empty($webfinger)) {
 665                         return [];
 666                 }
 667
 668                 return ['webfinger' => $webfinger, 'detected' => $detected];
 669         }
 670
 671         /**
 672          * Fetch information (protocol endpoints and user information) about a given uri
 673          *
 674          * This function is only called by the "uri" function that adds caching and rearranging of data.
 675          *
 676          * @param string  $uri        Address that should be probed
 677          * @param string  $network    Test for this specific network
 678          * @param integer $uid        User ID for the probe (only used for mails)
 679          * @param array   $ap_profile Previously probed AP profile
 680          * @return array URI data
 681          * @throws HTTPException\InternalServerErrorException
 682          */
 683         private static function detect(string $uri, string $network, int $uid, array $ap_profile): array
 684         {
 685                 $hookData = [
 686                         'uri'     => $uri,
 687                         'network' => $network,
 688                         'uid'     => $uid,
 689                         'result'  => null,
 690                 ];
 691
 692                 Hook::callAll('probe_detect', $hookData);
 693
 694                 if (isset($hookData['result'])) {
 695                         return is_array($hookData['result']) ? $hookData['result'] : [];
 696                 }
 697
 698                 $parts = parse_url($uri);
 699                 if (empty($parts['scheme']) && empty($parts['host']) && (empty($parts['path']) || strpos($parts['path'], '@') === false)) {
 700                         Logger::info('URI was not detectable', ['uri' => $uri]);
 701                         return [];
 702                 }
 703
 704                 // If the URI starts with "mailto:" then jump directly to the mail detection
 705                 if (strpos($uri, 'mailto:') !== false) {
 706                         $uri = str_replace('mailto:', '', $uri);
 707                         return self::mail($uri, $uid);
 708                 }
 709
 710                 if ($network == Protocol::MAIL) {
 711                         return self::mail($uri, $uid);
 712                 }
 713
 714                 Logger::info('Probing start', ['uri' => $uri]);
 715
 716                 if (!empty($ap_profile['addr']) && ($ap_profile['addr'] != $uri)) {
 717                         $data = self::getWebfingerArray($ap_profile['addr']);
 718                 }
 719
 720                 if (empty($data)) {
 721                         $data = self::getWebfingerArray($uri);
 722                 }
 723
 724                 if (empty($data)) {
 725                         if (!empty($parts['scheme'])) {
 726                                 return self::feed($uri);
 727                         } elseif (!empty($uid)) {
 728                                 return self::mail($uri, $uid);
 729                         } else {
 730                                 return [];
 731                         }
 732                 }
 733
 734                 $webfinger = $data['webfinger'];
 735                 $nick = $data['nick'] ?? '';
 736                 $addr = $data['addr'] ?? '';
 737                 $baseurl = $data['baseurl'] ?? '';
 738
 739                 $result = [];
 740
 741                 if (in_array($network, ['', Protocol::DFRN])) {
 742                         $result = self::dfrn($webfinger);
 743                 }
 744                 if ((!$result && ($network == '')) || ($network == Protocol::DIASPORA)) {
 745                         $result = self::diaspora($webfinger);
 746                 } else {
 747                         $result['networks'][Protocol::DIASPORA] = self::diaspora($webfinger);
 748                 }
 749                 if ((!$result && ($network == '')) || ($network == Protocol::OSTATUS)) {
 750                         $result = self::ostatus($webfinger);
 751                 } else {
 752                         $result['networks'][Protocol::OSTATUS] = self::ostatus($webfinger);
 753                 }
 754                 if (in_array($network, ['', Protocol::ZOT])) {
 755                         $result = self::zot($webfinger, $result, $baseurl);
 756                 }
 757                 if ((!$result && ($network == '')) || ($network == Protocol::PUMPIO)) {
 758                         $result = self::pumpio($webfinger, $addr);
 759                 }
 760                 if (empty($result['network']) && empty($ap_profile['network']) || ($network == Protocol::FEED)) {
 761                         $result = self::feed($uri);
 762                 } else {
 763                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 764                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 765                         if ((empty($result['nick']) || (strstr($result['nick'], ' '))) && ($nick != '')) {
 766                                 $result['nick'] = $nick;
 767                         }
 768
 769                         if (empty($result['addr']) && ($addr != '')) {
 770                                 $result['addr'] = $addr;
 771                         }
 772                 }
 773
 774                 $result = self::getSubscribeLink($result, $webfinger);
 775
 776                 if (empty($result['network'])) {
 777                         $result['network'] = Protocol::PHANTOM;
 778                 }
 779
 780                 if (empty($result['baseurl']) && !empty($baseurl)) {
 781                         $result['baseurl'] = $baseurl;
 782                 }
 783
 784                 if (empty($result['url'])) {
 785                         $result['url'] = $uri;
 786                 }
 787
 788                 Logger::info('Probing done', ['uri' => $uri, 'network' => $result['network']]);
 789
 790                 return $result;
 791         }
 792
 793         /**
 794          * Check for Zot contact
 795          *
 796          * @param array  $webfinger Webfinger data
 797          * @param array  $data      previously probed data
 798          * @param string $baseUrl   Base URL
 799          *
 800          * @return array Zot data
 801          * @throws HTTPException\InternalServerErrorException
 802          */
 803         private static function zot(array $webfinger, array $data, string $baseurl): array
 804         {
 805                 if (!empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
 806                         foreach ($webfinger['aliases'] as $alias) {
 807                                 if (substr($alias, 0, 5) == 'acct:') {
 808                                         $data['addr'] = substr($alias, 5);
 809                                 }
 810                         }
 811                 }
 812
 813                 if (!empty($webfinger['subject']) && (substr($webfinger['subject'], 0, 5) == 'acct:')) {
 814                         $data['addr'] = substr($webfinger['subject'], 5);
 815                 }
 816
 817                 $zot_url = '';
 818                 foreach ($webfinger['links'] as $link) {
 819                         if (($link['rel'] == 'http://purl.org/zot/protocol') && !empty($link['href'])) {
 820                                 $zot_url = $link['href'];
 821                         }
 822                 }
 823
 824                 if (empty($zot_url) && !empty($data['addr']) && !empty($baseurl)) {
 825                         $condition = ['nurl' => Strings::normaliseLink($baseurl), 'platform' => ['hubzilla']];
 826                         if (!DBA::exists('gserver', $condition)) {
 827                                 return $data;
 828                         }
 829                         $zot_url = $baseurl . '/.well-known/zot-info?address=' . $data['addr'];
 830                 }
 831
 832                 if (empty($zot_url)) {
 833                         return $data;
 834                 }
 835
 836                 $data = self::pollZot($zot_url, $data);
 837
 838                 if (!empty($data['url']) && !empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
 839                         foreach ($webfinger['aliases'] as $alias) {
 840                                 if (!strstr($alias, '@') && Strings::normaliseLink($alias) != Strings::normaliseLink($data['url'])) {
 841                                         $data['alias'] = $alias;
 842                                 }
 843                         }
 844                 }
 845
 846                 return $data;
 847         }
 848
 849         public static function pollZot(string $url, array $data): array
 850         {
 851                 $curlResult = DI::httpClient()->get($url, HttpClientAccept::JSON);
 852                 if ($curlResult->isTimeout()) {
 853                         return $data;
 854                 }
 855                 $content = $curlResult->getBody();
 856                 if (!$content) {
 857                         return $data;
 858                 }
 859
 860                 $json = json_decode($content, true);
 861                 if (!is_array($json)) {
 862                         return $data;
 863                 }
 864
 865                 if (empty($data['network'])) {
 866                         if (!empty($json['protocols']) && in_array('zot', $json['protocols'])) {
 867                                 $data['network'] = Protocol::ZOT;
 868                         } elseif (!isset($json['protocols'])) {
 869                                 $data['network'] = Protocol::ZOT;
 870                         }
 871                 }
 872
 873                 if (!empty($json['guid']) && empty($data['guid'])) {
 874                         $data['guid'] = $json['guid'];
 875                 }
 876                 if (!empty($json['key']) && empty($data['pubkey'])) {
 877                         $data['pubkey'] = $json['key'];
 878                 }
 879                 if (!empty($json['name'])) {
 880                         $data['name'] = $json['name'];
 881                 }
 882                 if (!empty($json['photo'])) {
 883                         $data['photo'] = $json['photo'];
 884                         if (!empty($json['photo_updated'])) {
 885                                 $data['photo'] .= '?rev=' . urlencode($json['photo_updated']);
 886                         }
 887                 }
 888                 if (!empty($json['address'])) {
 889                         $data['addr'] = $json['address'];
 890                 }
 891                 if (!empty($json['url'])) {
 892                         $data['url'] = $json['url'];
 893                 }
 894                 if (!empty($json['connections_url'])) {
 895                         $data['poco'] = $json['connections_url'];
 896                 }
 897                 if (isset($json['searchable'])) {
 898                         $data['hide'] = !$json['searchable'];
 899                 }
 900                 if (!empty($json['public_forum'])) {
 901                         $data['community'] = $json['public_forum'];
 902                         $data['account-type'] = User::PAGE_FLAGS_COMMUNITY;
 903                 }
 904
 905                 if (!empty($json['profile'])) {
 906                         $profile = $json['profile'];
 907                         if (!empty($profile['description'])) {
 908                                 $data['about'] = $profile['description'];
 909                         }
 910                         if (!empty($profile['keywords'])) {
 911                                 $keywords = implode(', ', $profile['keywords']);
 912                                 if (!empty($keywords)) {
 913                                         $data['keywords'] = $keywords;
 914                                 }
 915                         }
 916
 917                         $loc = [];
 918                         if (!empty($profile['region'])) {
 919                                 $loc['region'] = $profile['region'];
 920                         }
 921                         if (!empty($profile['country'])) {
 922                                 $loc['country-name'] = $profile['country'];
 923                         }
 924                         $location = Profile::formatLocation($loc);
 925                         if (!empty($location)) {
 926                                 $data['location'] = $location;
 927                         }
 928                 }
 929
 930                 return $data;
 931         }
 932
 933         /**
 934          * Perform a webfinger request.
 935          *
 936          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 937          *
 938          * @param string $url  Address that should be probed
 939          * @param string $type type
 940          *
 941          * @return array webfinger data
 942          * @throws HTTPException\InternalServerErrorException
 943          */
 944         public static function webfinger(string $url, string $type): array
 945         {
 946                 $xrd_timeout = DI::config()->get('system', 'xrd_timeout', 20);
 947
 948                 $curlResult = DI::httpClient()->get($url, $type, [HttpClientOptions::TIMEOUT => $xrd_timeout]);
 949                 if ($curlResult->isTimeout()) {
 950                         self::$isTimeout = true;
 951                         return [];
 952                 }
 953                 $data = $curlResult->getBody();
 954
 955                 $webfinger = json_decode($data, true);
 956                 if (!empty($webfinger)) {
 957                         if (!isset($webfinger['links'])) {
 958                                 Logger::info('No json webfinger links', ['url' => $url]);
 959                                 return [];
 960                         }
 961                         return $webfinger;
 962                 }
 963
 964                 // If it is not JSON, maybe it is XML
 965                 $xrd = XML::parseString($data, true);
 966                 if (!is_object($xrd)) {
 967                         Logger::info('No webfinger data retrievable', ['url' => $url]);
 968                         return [];
 969                 }
 970
 971                 $xrd_arr = XML::elementToArray($xrd);
 972                 if (!isset($xrd_arr['xrd']['link'])) {
 973                         Logger::info('No XML webfinger links', ['url' => $url]);
 974                         return [];
 975                 }
 976
 977                 $webfinger = [];
 978
 979                 if (!empty($xrd_arr['xrd']['subject'])) {
 980                         $webfinger['subject'] = $xrd_arr['xrd']['subject'];
 981                 }
 982
 983                 if (!empty($xrd_arr['xrd']['alias'])) {
 984                         $webfinger['aliases'] = $xrd_arr['xrd']['alias'];
 985                 }
 986
 987                 $webfinger['links'] = [];
 988
 989                 foreach ($xrd_arr['xrd']['link'] as $value => $data) {
 990                         if (!empty($data['@attributes'])) {
 991                                 $attributes = $data['@attributes'];
 992                         } elseif ($value == '@attributes') {
 993                                 $attributes = $data;
 994                         } else {
 995                                 continue;
 996                         }
 997
 998                         $webfinger['links'][] = $attributes;
 999                 }
1000                 return $webfinger;
1001         }
1002
1003         /**
1004          * Poll the Friendica specific noscrape page.
1005          *
1006          * "noscrape" is a faster alternative to fetch the data from the hcard.
1007          * This functionality was originally created for the directory.
1008          *
1009          * @param string $noscrape_url Link to the noscrape page
1010          * @param array  $data         The already fetched data
1011          *
1012          * @return array noscrape data
1013          * @throws HTTPException\InternalServerErrorException
1014          */
1015         private static function pollNoscrape(string $noscrape_url, array $data): array
1016         {
1017                 $curlResult = DI::httpClient()->get($noscrape_url, HttpClientAccept::JSON);
1018                 if ($curlResult->isTimeout()) {
1019                         self::$isTimeout = true;
1020                         return $data;
1021                 }
1022                 $content = $curlResult->getBody();
1023                 if (!$content) {
1024                         Logger::info('Empty body', ['url' => $noscrape_url]);
1025                         return $data;
1026                 }
1027
1028                 $json = json_decode($content, true);
1029                 if (!is_array($json)) {
1030                         Logger::info('No json data', ['url' => $noscrape_url]);
1031                         return $data;
1032                 }
1033
1034                 if (!empty($json['fn'])) {
1035                         $data['name'] = $json['fn'];
1036                 }
1037
1038                 if (!empty($json['addr'])) {
1039                         $data['addr'] = $json['addr'];
1040                 }
1041
1042                 if (!empty($json['nick'])) {
1043                         $data['nick'] = $json['nick'];
1044                 }
1045
1046                 if (!empty($json['guid'])) {
1047                         $data['guid'] = $json['guid'];
1048                 }
1049
1050                 if (!empty($json['comm'])) {
1051                         $data['community'] = $json['comm'];
1052                 }
1053
1054                 if (!empty($json['tags'])) {
1055                         $keywords = implode(', ', $json['tags']);
1056                         if ($keywords != '') {
1057                                 $data['keywords'] = $keywords;
1058                         }
1059                 }
1060
1061                 $location = Profile::formatLocation($json);
1062                 if ($location) {
1063                         $data['location'] = $location;
1064                 }
1065
1066                 if (!empty($json['about'])) {
1067                         $data['about'] = $json['about'];
1068                 }
1069
1070                 if (!empty($json['xmpp'])) {
1071                         $data['xmpp'] = $json['xmpp'];
1072                 }
1073
1074                 if (!empty($json['matrix'])) {
1075                         $data['matrix'] = $json['matrix'];
1076                 }
1077
1078                 if (!empty($json['key'])) {
1079                         $data['pubkey'] = $json['key'];
1080                 }
1081
1082                 if (!empty($json['photo'])) {
1083                         $data['photo'] = $json['photo'];
1084                 }
1085
1086                 if (!empty($json['dfrn-request'])) {
1087                         $data['request'] = $json['dfrn-request'];
1088                 }
1089
1090                 if (!empty($json['dfrn-confirm'])) {
1091                         $data['confirm'] = $json['dfrn-confirm'];
1092                 }
1093
1094                 if (!empty($json['dfrn-notify'])) {
1095                         $data['notify'] = $json['dfrn-notify'];
1096                 }
1097
1098                 if (!empty($json['dfrn-poll'])) {
1099                         $data['poll'] = $json['dfrn-poll'];
1100                 }
1101
1102                 if (isset($json['hide'])) {
1103                         $data['hide'] = (bool)$json['hide'];
1104                 } else {
1105                         $data['hide'] = false;
1106                 }
1107
1108                 return $data;
1109         }
1110
1111         /**
1112          * Check for valid DFRN data
1113          *
1114          * @param array $data DFRN data
1115          *
1116          * @return int Number of errors
1117          */
1118         public static function validDfrn(array $data): int
1119         {
1120                 $errors = 0;
1121                 if (!isset($data['key'])) {
1122                         $errors ++;
1123                 }
1124                 if (!isset($data['dfrn-request'])) {
1125                         $errors ++;
1126                 }
1127                 if (!isset($data['dfrn-confirm'])) {
1128                         $errors ++;
1129                 }
1130                 if (!isset($data['dfrn-notify'])) {
1131                         $errors ++;
1132                 }
1133                 if (!isset($data['dfrn-poll'])) {
1134                         $errors ++;
1135                 }
1136                 return $errors;
1137         }
1138
1139         /**
1140          * Fetch data from a DFRN profile page and via "noscrape"
1141          *
1142          * @param string $profile_link Link to the profile page
1143          * @return array profile data
1144          * @throws HTTPException\InternalServerErrorException
1145          * @throws \ImagickException
1146          */
1147         public static function profile(string $profile_link): array
1148         {
1149                 $data = [];
1150
1151                 Logger::info('Check profile', ['link' => $profile_link]);
1152
1153                 // Fetch data via noscrape - this is faster
1154                 $noscrape_url = str_replace(['/hcard/', '/profile/'], '/noscrape/', $profile_link);
1155                 $data = self::pollNoscrape($noscrape_url, $data);
1156
1157                 if (!isset($data['notify'])
1158                         || !isset($data['confirm'])
1159                         || !isset($data['request'])
1160                         || !isset($data['poll'])
1161                         || !isset($data['name'])
1162                         || !isset($data['photo'])
1163                 ) {
1164                         $data = self::pollHcard($profile_link, $data, true);
1165                 }
1166
1167                 $prof_data = [];
1168
1169                 if (empty($data['addr']) || empty($data['nick'])) {
1170                         $probe_data = self::uri($profile_link);
1171                         $data['addr'] = ($data['addr'] ?? '') ?: $probe_data['addr'];
1172                         $data['nick'] = ($data['nick'] ?? '') ?: $probe_data['nick'];
1173                 }
1174
1175                 $prof_data['addr']         = $data['addr'];
1176                 $prof_data['nick']         = $data['nick'];
1177                 $prof_data['dfrn-request'] = $data['request'] ?? null;
1178                 $prof_data['dfrn-confirm'] = $data['confirm'] ?? null;
1179                 $prof_data['dfrn-notify']  = $data['notify']  ?? null;
1180                 $prof_data['dfrn-poll']    = $data['poll']    ?? null;
1181                 $prof_data['photo']        = $data['photo']   ?? null;
1182                 $prof_data['fn']           = $data['name']    ?? null;
1183                 $prof_data['key']          = $data['pubkey']  ?? null;
1184
1185                 Logger::debug('Result', ['link' => $profile_link, 'data' => $prof_data]);
1186
1187                 return $prof_data;
1188         }
1189
1190         /**
1191          * Check for DFRN contact
1192          *
1193          * @param array $webfinger Webfinger data
1194          * @return array DFRN data
1195          * @throws HTTPException\InternalServerErrorException
1196          */
1197         private static function dfrn(array $webfinger): array
1198         {
1199                 $hcard_url = '';
1200                 $data = [];
1201                 // The array is reversed to take into account the order of preference for same-rel links
1202                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1203                 foreach (array_reverse($webfinger['links']) as $link) {
1204                         if (($link['rel'] == ActivityNamespace::DFRN) && !empty($link['href'])) {
1205                                 $data['network'] = Protocol::DFRN;
1206                         } elseif (($link['rel'] == ActivityNamespace::FEED) && !empty($link['href'])) {
1207                                 $data['poll'] = $link['href'];
1208                         } elseif (($link['rel'] == 'http://webfinger.net/rel/profile-page') && (($link['type'] ?? '') == 'text/html') && !empty($link['href'])) {
1209                                 $data['url'] = $link['href'];
1210                         } elseif (($link['rel'] == 'http://microformats.org/profile/hcard') && !empty($link['href'])) {
1211                                 $hcard_url = $link['href'];
1212                         } elseif (($link['rel'] == ActivityNamespace::POCO) && !empty($link['href'])) {
1213                                 $data['poco'] = $link['href'];
1214                         } elseif (($link['rel'] == 'http://webfinger.net/rel/avatar') && !empty($link['href'])) {
1215                                 $data['photo'] = $link['href'];
1216                         } elseif (($link['rel'] == 'http://joindiaspora.com/seed_location') && !empty($link['href'])) {
1217                                 $data['baseurl'] = trim($link['href'], '/');
1218                         } elseif (($link['rel'] == 'http://joindiaspora.com/guid') && !empty($link['href'])) {
1219                                 $data['guid'] = $link['href'];
1220                         } elseif (($link['rel'] == 'diaspora-public-key') && !empty($link['href'])) {
1221                                 $data['pubkey'] = base64_decode($link['href']);
1222
1223                                 if (strstr($data['pubkey'], 'RSA ')) {
1224                                         $data['pubkey'] = Crypto::rsaToPem($data['pubkey']);
1225                                 }
1226                         }
1227                 }
1228
1229                 if (!empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
1230                         foreach ($webfinger['aliases'] as $alias) {
1231                                 if (empty($data['url']) && !strstr($alias, '@')) {
1232                                         $data['url'] = $alias;
1233                                 } elseif (!strstr($alias, '@') && Strings::normaliseLink($alias) != Strings::normaliseLink($data['url'])) {
1234                                         $data['alias'] = $alias;
1235                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1236                                         $data['addr'] = substr($alias, 5);
1237                                 }
1238                         }
1239                 }
1240
1241                 if (!empty($webfinger['subject']) && (substr($webfinger['subject'], 0, 5) == 'acct:')) {
1242                         $data['addr'] = substr($webfinger['subject'], 5);
1243                 }
1244
1245                 if (!isset($data['network']) || ($hcard_url == '')) {
1246                         return [];
1247                 }
1248
1249                 // Fetch data via noscrape - this is faster
1250                 $noscrape_url = str_replace('/hcard/', '/noscrape/', $hcard_url);
1251                 $data = self::pollNoscrape($noscrape_url, $data);
1252
1253                 if (isset($data['notify'])
1254                         && isset($data['confirm'])
1255                         && isset($data['request'])
1256                         && isset($data['poll'])
1257                         && isset($data['name'])
1258                         && isset($data['photo'])
1259                 ) {
1260                         return $data;
1261                 }
1262
1263                 $data = self::pollHcard($hcard_url, $data, true);
1264
1265                 return $data;
1266         }
1267
1268         /**
1269          * Poll the hcard page (Diaspora and Friendica specific)
1270          *
1271          * @param string  $hcard_url Link to the hcard page
1272          * @param array   $data      The already fetched data
1273          * @param boolean $dfrn      Poll DFRN specific data
1274          * @return array hcard data
1275          * @throws HTTPException\InternalServerErrorException
1276          */
1277         private static function pollHcard(string $hcard_url, array $data, bool $dfrn = false): array
1278         {
1279                 $curlResult = DI::httpClient()->get($hcard_url, HttpClientAccept::HTML);
1280                 if ($curlResult->isTimeout()) {
1281                         self::$isTimeout = true;
1282                         return [];
1283                 }
1284                 $content = $curlResult->getBody();
1285                 if (empty($content)) {
1286                         return [];
1287                 }
1288
1289                 $doc = new DOMDocument();
1290                 if (!@$doc->loadHTML($content)) {
1291                         return [];
1292                 }
1293
1294                 $xpath = new DomXPath($doc);
1295
1296                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1297                 if (!is_object($vcards)) {
1298                         return [];
1299                 }
1300
1301                 if (!isset($data['baseurl'])) {
1302                         $data['baseurl'] = '';
1303                 }
1304
1305                 if ($vcards->length > 0) {
1306                         $vcard = $vcards->item(0);
1307
1308                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1309                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1310                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1311                         if (($search->length > 0) && empty($data['guid'])) {
1312                                 $data['guid'] = $search->item(0)->nodeValue;
1313                         }
1314
1315                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1316                         if ($search->length > 0) {
1317                                 $data['nick'] = $search->item(0)->nodeValue;
1318                         }
1319
1320                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1321                         if ($search->length > 0) {
1322                                 $data['name'] = $search->item(0)->nodeValue;
1323                         }
1324
1325                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' given_name ')]", $vcard); // */
1326                         if ($search->length > 0) {
1327                                 $data["given_name"] = $search->item(0)->nodeValue;
1328                         }
1329
1330                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' family_name ')]", $vcard); // */
1331                         if ($search->length > 0) {
1332                                 $data["family_name"] = $search->item(0)->nodeValue;
1333                         }
1334
1335                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1336                         if ($search->length > 0) {
1337                                 $data['hide'] = (strtolower($search->item(0)->nodeValue) != 'true');
1338                         }
1339
1340                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1341                         if ($search->length > 0) {
1342                                 $data['pubkey'] = $search->item(0)->nodeValue;
1343                                 if (strstr($data['pubkey'], 'RSA ')) {
1344                                         $data['pubkey'] = Crypto::rsaToPem($data['pubkey']);
1345                                 }
1346                         }
1347
1348                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1349                         if ($search->length > 0) {
1350                                 $data['baseurl'] = trim($search->item(0)->nodeValue, '/');
1351                         }
1352                 }
1353
1354                 $avatars = [];
1355                 if (!empty($vcard)) {
1356                         $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1357                         foreach ($photos as $photo) {
1358                                 $attr = [];
1359                                 foreach ($photo->attributes as $attribute) {
1360                                         $attr[$attribute->name] = trim($attribute->value);
1361                                 }
1362
1363                                 if (isset($attr['src']) && isset($attr['width'])) {
1364                                         $avatars[$attr['width']] = self::fixAvatar($attr['src'], $data['baseurl']);
1365                                 }
1366
1367                                 // We don't have a width. So we just take everything that we got.
1368                                 // This is a Hubzilla workaround which doesn't send a width.
1369                                 if (!$avatars && !empty($attr['src'])) {
1370                                         $avatars[] = self::fixAvatar($attr['src'], $data['baseurl']);
1371                                 }
1372                         }
1373                 }
1374
1375                 if ($avatars) {
1376                         ksort($avatars);
1377                         $data['photo'] = array_pop($avatars);
1378                         if ($avatars) {
1379                                 $data['photo_medium'] = array_pop($avatars);
1380                         }
1381
1382                         if ($avatars) {
1383                                 $data['photo_small'] = array_pop($avatars);
1384                         }
1385                 }
1386
1387                 if ($dfrn) {
1388                         // Poll DFRN specific data
1389                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1390                         if ($search->length > 0) {
1391                                 foreach ($search as $link) {
1392                                         //$data['request'] = $search->item(0)->nodeValue;
1393                                         $attr = [];
1394                                         foreach ($link->attributes as $attribute) {
1395                                                 $attr[$attribute->name] = trim($attribute->value);
1396                                         }
1397
1398                                         $data[substr($attr['rel'], 5)] = $attr['href'];
1399                                 }
1400                         }
1401
1402                         // Older Friendica versions had used the "uid" field differently than newer versions
1403                         if (!empty($data['nick']) && !empty($data['guid']) && ($data['nick'] == $data['guid'])) {
1404                                 unset($data['guid']);
1405                         }
1406                 }
1407
1408                 return $data;
1409         }
1410
1411         /**
1412          * Check for Diaspora contact
1413          *
1414          * @param array $webfinger Webfinger data
1415          *
1416          * @return array Diaspora data
1417          * @throws HTTPException\InternalServerErrorException
1418          */
1419         private static function diaspora(array $webfinger): array
1420         {
1421                 $hcard_url = '';
1422                 $data = [];
1423
1424                 // The array is reversed to take into account the order of preference for same-rel links
1425                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1426                 foreach (array_reverse($webfinger['links']) as $link) {
1427                         if (($link['rel'] == 'http://microformats.org/profile/hcard') && !empty($link['href'])) {
1428                                 $hcard_url = $link['href'];
1429                         } elseif (($link['rel'] == 'http://joindiaspora.com/seed_location') && !empty($link['href'])) {
1430                                 $data['baseurl'] = trim($link['href'], '/');
1431                         } elseif (($link['rel'] == 'http://joindiaspora.com/guid') && !empty($link['href'])) {
1432                                 $data['guid'] = $link['href'];
1433                         } elseif (($link['rel'] == 'http://webfinger.net/rel/profile-page') && (($link['type'] ?? '') == 'text/html') && !empty($link['href'])) {
1434                                 $data['url'] = $link['href'];
1435                         } elseif (($link['rel'] == 'http://webfinger.net/rel/profile-page') && empty($link['type']) && !empty($link['href'])) {
1436                                 $profile_url = $link['href'];
1437                         } elseif (($link['rel'] == ActivityNamespace::FEED) && !empty($link['href'])) {
1438                                 $data['poll'] = $link['href'];
1439                         } elseif (($link['rel'] == ActivityNamespace::POCO) && !empty($link['href'])) {
1440                                 $data['poco'] = $link['href'];
1441                         } elseif (($link['rel'] == 'salmon') && !empty($link['href'])) {
1442                                 $data['notify'] = $link['href'];
1443                         } elseif (($link['rel'] == 'diaspora-public-key') && !empty($link['href'])) {
1444                                 $data['pubkey'] = base64_decode($link['href']);
1445
1446                                 if (strstr($data['pubkey'], 'RSA ')) {
1447                                         $data['pubkey'] = Crypto::rsaToPem($data['pubkey']);
1448                                 }
1449                         }
1450                 }
1451
1452                 if (empty($data['url']) && !empty($profile_url)) {
1453                         $data['url'] = $profile_url;
1454                 }
1455
1456                 if (empty($data['url']) || empty($hcard_url)) {
1457                         return [];
1458                 }
1459
1460                 if (!empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
1461                         foreach ($webfinger['aliases'] as $alias) {
1462                                 if (Strings::normaliseLink($alias) != Strings::normaliseLink($data['url']) && ! strstr($alias, '@')) {
1463                                         $data['alias'] = $alias;
1464                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1465                                         $data['addr'] = substr($alias, 5);
1466                                 }
1467                         }
1468                 }
1469
1470                 if (!empty($webfinger['subject']) && (substr($webfinger['subject'], 0, 5) == 'acct:')) {
1471                         $data['addr'] = substr($webfinger['subject'], 5);
1472                 }
1473
1474                 // Fetch further information from the hcard
1475                 $data = self::pollHcard($hcard_url, $data);
1476
1477                 if (!$data) {
1478                         return [];
1479                 }
1480
1481                 if (!empty($data['url'])
1482                         && !empty($data['guid'])
1483                         && !empty($data['baseurl'])
1484                         && !empty($data['pubkey'])
1485                         && !empty($hcard_url)
1486                 ) {
1487                         $data['network'] = Protocol::DIASPORA;
1488                         $data['manually-approve'] = false;
1489
1490                         // The Diaspora handle must always be lowercase
1491                         if (!empty($data['addr'])) {
1492                                 $data['addr'] = strtolower($data['addr']);
1493                         }
1494
1495                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1496                         $data['notify'] = $data['baseurl'] . '/receive/users/' . $data['guid'];
1497                         $data['batch']  = $data['baseurl'] . '/receive/public';
1498                 } else {
1499                         return [];
1500                 }
1501
1502                 return $data;
1503         }
1504
1505         /**
1506          * Check for OStatus contact
1507          *
1508          * @param array $webfinger Webfinger data
1509          * @param bool  $short     Short detection mode
1510          *
1511          * @return array|bool OStatus data or "false" on error or "true" on short mode
1512          * @throws HTTPException\InternalServerErrorException
1513          */
1514         private static function ostatus(array $webfinger, bool $short = false)
1515         {
1516                 $data = [];
1517
1518                 if (!empty($webfinger['aliases']) && is_array($webfinger['aliases'])) {
1519                         foreach ($webfinger['aliases'] as $alias) {
1520                                 if (strstr($alias, '@') && !strstr(Strings::normaliseLink($alias), 'http://')) {
1521                                         $data['addr'] = str_replace('acct:', '', $alias);
1522                                 }
1523                         }
1524                 }
1525
1526                 if (!empty($webfinger['subject']) && strstr($webfinger['subject'], '@')
1527                         && !strstr(Strings::normaliseLink($webfinger['subject']), 'http://')
1528                 ) {
1529                         $data['addr'] = str_replace('acct:', '', $webfinger['subject']);
1530                 }
1531
1532                 if (!empty($webfinger['links'])) {
1533                         // The array is reversed to take into account the order of preference for same-rel links
1534                         // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1535                         foreach (array_reverse($webfinger['links']) as $link) {
1536                                 if (($link['rel'] == 'http://webfinger.net/rel/profile-page')
1537                                         && (($link['type'] ?? '') == 'text/html')
1538                                         && ($link['href'] != '')
1539                                 ) {
1540                                         $data['url'] = $data['alias'] = $link['href'];
1541                                 } elseif (($link['rel'] == 'salmon') && !empty($link['href'])) {
1542                                         $data['notify'] = $link['href'];
1543                                 } elseif (($link['rel'] == ActivityNamespace::FEED) && !empty($link['href'])) {
1544                                         $data['poll'] = $link['href'];
1545                                 } elseif (($link['rel'] == 'magic-public-key') && !empty($link['href'])) {
1546                                         $pubkey = $link['href'];
1547
1548                                         if (substr($pubkey, 0, 5) === 'data:') {
1549                                                 if (strstr($pubkey, ',')) {
1550                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1551                                                 } else {
1552                                                         $pubkey = substr($pubkey, 5);
1553                                                 }
1554                                         } elseif (Strings::normaliseLink($pubkey) == 'http://') {
1555                                                 $curlResult = DI::httpClient()->get($pubkey, HttpClientAccept::MAGIC_KEY);
1556                                                 if ($curlResult->isTimeout()) {
1557                                                         self::$isTimeout = true;
1558                                                         return $short ? false : [];
1559                                                 }
1560                                                 Logger::debug('Fetched public key', ['Content-Type' => $curlResult->getHeader('Content-Type'), 'url' => $pubkey]);
1561                                                 $pubkey = $curlResult->getBody();
1562                                         }
1563
1564                                         try {
1565                                                 $data['pubkey'] = Salmon::magicKeyToPem($pubkey);
1566                                         } catch (\Throwable $e) {
1567
1568                                         }
1569                                 }
1570                         }
1571                 }
1572
1573                 if (isset($data['notify']) && isset($data['pubkey'])
1574                         && isset($data['poll'])
1575                         && isset($data['url'])
1576                 ) {
1577                         $data['network'] = Protocol::OSTATUS;
1578                         $data['manually-approve'] = false;
1579                 } else {
1580                         return $short ? false : [];
1581                 }
1582
1583                 if ($short) {
1584                         return true;
1585                 }
1586
1587                 // Fetch all additional data from the feed
1588                 $curlResult = DI::httpClient()->get($data['poll'], HttpClientAccept::FEED_XML);
1589                 if ($curlResult->isTimeout()) {
1590                         self::$isTimeout = true;
1591                         return [];
1592                 }
1593                 $feed = $curlResult->getBody();
1594                 $feed_data = Feed::import($feed);
1595                 if (!$feed_data) {
1596                         return [];
1597                 }
1598
1599                 if (!empty($feed_data['header']['author-name'])) {
1600                         $data['name'] = $feed_data['header']['author-name'];
1601                 }
1602                 if (!empty($feed_data['header']['author-nick'])) {
1603                         $data['nick'] = $feed_data['header']['author-nick'];
1604                 }
1605                 if (!empty($feed_data['header']['author-avatar'])) {
1606                         $data['photo'] = self::fixAvatar($feed_data['header']['author-avatar'], $data['url']);
1607                 }
1608                 if (!empty($feed_data['header']['author-id'])) {
1609                         $data['alias'] = $feed_data['header']['author-id'];
1610                 }
1611                 if (!empty($feed_data['header']['author-location'])) {
1612                         $data['location'] = $feed_data['header']['author-location'];
1613                 }
1614                 if (!empty($feed_data['header']['author-about'])) {
1615                         $data['about'] = $feed_data['header']['author-about'];
1616                 }
1617                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1618                 // So we take the value that we just fetched, although the other one worked as well
1619                 if (!empty($feed_data['header']['author-link'])) {
1620                         $data['url'] = $feed_data['header']['author-link'];
1621                 }
1622
1623                 if ($data['url'] == $data['alias']) {
1624                         $data['alias'] = '';
1625                 }
1626
1627                 /// @todo Fetch location and "about" from the feed as well
1628                 return $data;
1629         }
1630
1631         /**
1632          * Fetch data from a pump.io profile page
1633          *
1634          * @param string $profile_link Link to the profile page
1635          *
1636          * @return array Profile data
1637          */
1638         private static function pumpioProfileData(string $profile_link): array
1639         {
1640                 $curlResult = DI::httpClient()->get($profile_link, HttpClientAccept::HTML);
1641                 if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
1642                         return [];
1643                 }
1644
1645                 $doc = new DOMDocument();
1646                 if (!@$doc->loadHTML($curlResult->getBody())) {
1647                         return [];
1648                 }
1649
1650                 $xpath = new DomXPath($doc);
1651
1652                 $data = [];
1653                 $data['name'] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
1654
1655                 if ($data['name'] == '') {
1656                         // This is ugly - but pump.io doesn't seem to know a better way for it
1657                         $data['name'] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1658                         $pos = strpos($data['name'], chr(10));
1659                         if ($pos) {
1660                                 $data['name'] = trim(substr($data['name'], 0, $pos));
1661                         }
1662                 }
1663
1664                 $data['location'] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-locality')]");
1665
1666                 if ($data['location'] == '') {
1667                         $data['location'] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'location')]");
1668                 }
1669
1670                 $data['about'] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-note')]");
1671
1672                 if ($data['about'] == '') {
1673                         $data['about'] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'summary')]");
1674                 }
1675
1676                 $avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
1677                 if (!$avatar) {
1678                         $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1679                 }
1680                 if ($avatar) {
1681                         foreach ($avatar->attributes as $attribute) {
1682                                 if ($attribute->name == 'src') {
1683                                         $data['photo'] = trim($attribute->value);
1684                                 }
1685                         }
1686                 }
1687
1688                 return $data;
1689         }
1690
1691         /**
1692          * Check for pump.io contact
1693          *
1694          * @param array  $webfinger Webfinger data
1695          * @param string $addr
1696          *
1697          * @return array pump.io data
1698          */
1699         private static function pumpio(array $webfinger, string $addr): array
1700         {
1701                 $data = [];
1702                 // The array is reversed to take into account the order of preference for same-rel links
1703                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1704                 foreach (array_reverse($webfinger['links']) as $link) {
1705                         if (($link['rel'] == 'http://webfinger.net/rel/profile-page')
1706                                 && (($link['type'] ?? '') == 'text/html')
1707                                 && ($link['href'] != '')
1708                         ) {
1709                                 $data['url'] = $link['href'];
1710                         } elseif (($link['rel'] == 'activity-inbox') && ($link['href'] != '')) {
1711                                 $data['notify'] = $link['href'];
1712                         } elseif (($link['rel'] == 'activity-outbox') && ($link['href'] != '')) {
1713                                 $data['poll'] = $link['href'];
1714                         } elseif (($link['rel'] == 'dialback') && ($link['href'] != '')) {
1715                                 $data['dialback'] = $link['href'];
1716                         }
1717                 }
1718                 if (isset($data['poll']) && isset($data['notify'])
1719                         && isset($data['dialback'])
1720                         && isset($data['url'])
1721                 ) {
1722                         // by now we use these fields only for the network type detection
1723                         // So we unset all data that isn't used at the moment
1724                         unset($data['dialback']);
1725
1726                         $data['network'] = Protocol::PUMPIO;
1727                 } else {
1728                         return [];
1729                 }
1730
1731                 $profile_data = self::pumpioProfileData($data['url']);
1732
1733                 if (!$profile_data) {
1734                         return [];
1735                 }
1736
1737                 $data = array_merge($data, $profile_data);
1738
1739                 if (($addr != '') && ($data['name'] != '')) {
1740                         $name = trim(str_replace($addr, '', $data['name']));
1741                         if ($name != '') {
1742                                 $data['name'] = $name;
1743                         }
1744                 }
1745
1746                 return $data;
1747         }
1748
1749         /**
1750          * Checks HTML page for RSS feed link
1751          *
1752          * @param string $url  Page link
1753          * @param string $body Page body string
1754          *
1755          * @return string|false Feed link or false if body was invalid HTML document
1756          */
1757         public static function getFeedLink(string $url, string $body)
1758         {
1759                 if (empty($body)) {
1760                         return '';
1761                 }
1762
1763                 $doc = new DOMDocument();
1764                 if (!@$doc->loadHTML($body)) {
1765                         return false;
1766                 }
1767
1768                 $xpath = new DOMXPath($doc);
1769
1770                 $feedUrl = $xpath->evaluate('string(/html/head/link[@type="application/rss+xml" and @rel="alternate"]/@href)');
1771                 $feedUrl = $feedUrl ?: $xpath->evaluate('string(/html/head/link[@type="application/atom+xml" and @rel="alternate"]/@href)');
1772
1773                 $feedUrl = $feedUrl ? self::ensureAbsoluteLinkFromHTMLDoc($feedUrl, $url, $xpath) : '';
1774
1775                 return $feedUrl;
1776         }
1777
1778         /**
1779          * Return an absolute URL in the context of a HTML document retrieved from the provided URL.
1780          *
1781          * Loosely based on RFC 1808
1782          *
1783          * @see https://tools.ietf.org/html/rfc1808
1784          *
1785          * @param string   $href  The potential relative href found in the HTML document
1786          * @param string   $base  The HTML document URL
1787          * @param DOMXPath $xpath The HTML document XPath
1788          *
1789          * @return string Absolute URL
1790          */
1791         private static function ensureAbsoluteLinkFromHTMLDoc(string $href, string $base, DOMXPath $xpath): string
1792         {
1793                 if (filter_var($href, FILTER_VALIDATE_URL)) {
1794                         return $href;
1795                 }
1796
1797                 $base = $xpath->evaluate('string(/html/head/base/@href)') ?: $base;
1798
1799                 $baseParts = parse_url($base);
1800                 if (empty($baseParts['host'])) {
1801                         return $href;
1802                 }
1803
1804                 // Naked domain case (scheme://basehost)
1805                 $path = $baseParts['path'] ?? '/';
1806
1807                 // Remove the filename part of the path if it exists (/base/path/file)
1808                 $path = implode('/', array_slice(explode('/', $path), 0, -1));
1809
1810                 $hrefParts = parse_url($href);
1811
1812                 if (!empty($hrefParts['path'])) {
1813                         // Root path case (/path) including relative scheme case (//host/path)
1814                         if ($hrefParts['path'] && $hrefParts['path'][0] == '/') {
1815                                 $path = $hrefParts['path'];
1816                         } else {
1817                                 $path = $path . '/' . $hrefParts['path'];
1818
1819                                 // Resolve arbitrary relative path
1820                                 // Lifted from https://www.php.net/manual/en/function.realpath.php#84012
1821                                 $parts = array_filter(explode('/', $path), 'strlen');
1822                                 $absolutes = [];
1823                                 foreach ($parts as $part) {
1824                                         if ('.' == $part) continue;
1825                                         if ('..' == $part) {
1826                                                 array_pop($absolutes);
1827                                         } else {
1828                                                 $absolutes[] = $part;
1829                                         }
1830                                 }
1831
1832                                 $path = '/' . implode('/', $absolutes);
1833                         }
1834                 }
1835
1836                 // Relative scheme case (//host/path)
1837                 $baseParts['host'] = $hrefParts['host'] ?? $baseParts['host'];
1838                 $baseParts['path'] = $path;
1839                 unset($baseParts['query']);
1840                 unset($baseParts['fragment']);
1841
1842                 return Network::unparseURL($baseParts);
1843         }
1844
1845         /**
1846          * Check for feed contact
1847          *
1848          * @param string  $url   Profile link
1849          * @param boolean $probe Do a probe if the page contains a feed link
1850          *
1851          * @return array feed data
1852          * @throws HTTPException\InternalServerErrorException
1853          */
1854         private static function feed(string $url, bool $probe = true): array
1855         {
1856                 $curlResult = DI::httpClient()->get($url, HttpClientAccept::FEED_XML);
1857                 if ($curlResult->isTimeout()) {
1858                         self::$isTimeout = true;
1859                         return [];
1860                 }
1861                 $feed = $curlResult->getBody();
1862                 $feed_data = Feed::import($feed);
1863
1864                 if (!$feed_data) {
1865                         if (!$probe) {
1866                                 return [];
1867                         }
1868
1869                         $feed_url = self::getFeedLink($url, $feed);
1870
1871                         if (!$feed_url) {
1872                                 return [];
1873                         }
1874
1875                         return self::feed($feed_url, false);
1876                 }
1877
1878                 if (!empty($feed_data['header']['author-name'])) {
1879                         $data['name'] = $feed_data['header']['author-name'];
1880                 }
1881
1882                 if (!empty($feed_data['header']['author-nick'])) {
1883                         $data['nick'] = $feed_data['header']['author-nick'];
1884                 }
1885
1886                 if (!empty($feed_data['header']['author-avatar'])) {
1887                         $data['photo'] = $feed_data['header']['author-avatar'];
1888                 }
1889
1890                 if (!empty($feed_data['header']['author-id'])) {
1891                         $data['alias'] = $feed_data['header']['author-id'];
1892                 }
1893
1894                 $data['url'] = $url;
1895                 $data['poll'] = $url;
1896
1897                 $data['network'] = Protocol::FEED;
1898
1899                 return $data;
1900         }
1901
1902         /**
1903          * Check for mail contact
1904          *
1905          * @param string  $uri Profile link
1906          * @param integer $uid User ID
1907          *
1908          * @return array mail data
1909          * @throws \Exception
1910          */
1911         private static function mail(string $uri, int $uid): array
1912         {
1913                 if (!Network::isEmailDomainValid($uri)) {
1914                         return [];
1915                 }
1916
1917                 if ($uid == 0) {
1918                         return [];
1919                 }
1920
1921                 $user = DBA::selectFirst('user', ['prvkey'], ['uid' => $uid]);
1922
1923                 $condition = ["`uid` = ? AND `server` != ''", $uid];
1924                 $fields = ['pass', 'user', 'server', 'port', 'ssltype', 'mailbox'];
1925                 $mailacct = DBA::selectFirst('mailacct', $fields, $condition);
1926
1927                 if (!DBA::isResult($user) || !DBA::isResult($mailacct)) {
1928                         return [];
1929                 }
1930
1931                 $mailbox = Email::constructMailboxName($mailacct);
1932                 $password = '';
1933                 openssl_private_decrypt(hex2bin($mailacct['pass']), $password, $user['prvkey']);
1934                 $mbox = Email::connect($mailbox, $mailacct['user'], $password);
1935                 if (!$mbox) {
1936                         return [];
1937                 }
1938
1939                 $msgs = Email::poll($mbox, $uri);
1940                 Logger::info('Messages found', ['uri' => $uri, 'count' => count($msgs)]);
1941
1942                 if (!count($msgs)) {
1943                         return [];
1944                 }
1945
1946                 $phost = substr($uri, strpos($uri, '@') + 1);
1947
1948                 $data = [
1949                         'addr'    => $uri,
1950                         'network' => Protocol::MAIL,
1951                         'name'    => substr($uri, 0, strpos($uri, '@')),
1952                         'photo'   => Network::lookupAvatarByEmail($uri),
1953                         'url'     => 'mailto:' . $uri,
1954                         'notify'  => 'smtp ' . Strings::getRandomHex(),
1955                         'poll'    => 'email ' . Strings::getRandomHex(),
1956                 ];
1957
1958                 $data['nick']    = $data['name'];
1959
1960                 $x = Email::messageMeta($mbox, $msgs[0]);
1961
1962                 if (stristr($x[0]->from, $uri)) {
1963                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1964                 } elseif (stristr($x[0]->to, $uri)) {
1965                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1966                 }
1967
1968                 if (isset($adr)) {
1969                         foreach ($adr as $feadr) {
1970                                 if ((strcasecmp($feadr->mailbox, $data['name']) == 0)
1971                                         &&(strcasecmp($feadr->host, $phost) == 0)
1972                                         && (strlen($feadr->personal))
1973                                 ) {
1974                                         $personal = imap_mime_header_decode($feadr->personal);
1975                                         $data['name'] = '';
1976                                         foreach ($personal as $perspart) {
1977                                                 if ($perspart->charset != 'default') {
1978                                                         $data['name'] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1979                                                 } else {
1980                                                         $data['name'] .= $perspart->text;
1981                                                 }
1982                                         }
1983                                 }
1984                         }
1985                 }
1986
1987                 if (!empty($mbox)) {
1988                         imap_close($mbox);
1989                 }
1990
1991                 return $data;
1992         }
1993
1994         /**
1995          * Mix two paths together to possibly fix missing parts
1996          *
1997          * @param string $avatar Path to the avatar
1998          * @param string $base   Another path that is hopefully complete
1999          *
2000          * @return string fixed avatar path
2001          * @throws \Exception
2002          */
2003         public static function fixAvatar(string $avatar, string $base): string
2004         {
2005                 $base_parts = parse_url($base);
2006
2007                 // Remove all parts that could create a problem
2008                 unset($base_parts['path']);
2009                 unset($base_parts['query']);
2010                 unset($base_parts['fragment']);
2011
2012                 $avatar_parts = parse_url($avatar);
2013
2014                 // Now we mix them
2015                 $parts = array_merge($base_parts, $avatar_parts);
2016
2017                 // And put them together again
2018                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
2019                 $host     = isset($parts['host'])     ? $parts['host']           : '';
2020                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
2021                 $path     = isset($parts['path'])     ? $parts['path']           : '';
2022                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
2023                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
2024
2025                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
2026
2027                 Logger::debug('Avatar fixed', ['base' => $base, 'avatar' => $avatar, 'fixed' => $fixed]);
2028
2029                 return $fixed;
2030         }
2031
2032         /**
2033          * Fetch the last date that the contact had posted something (publically)
2034          *
2035          * @param array $data  probing result
2036          *
2037          * @return string last activity
2038          */
2039         public static function getLastUpdate(array $data): string
2040         {
2041                 $uid = User::getIdForURL($data['url']);
2042                 if (!empty($uid)) {
2043                         $contact = Contact::selectFirst(['url', 'last-item'], ['self' => true, 'uid' => $uid]);
2044                         if (!empty($contact['last-item'])) {
2045                                 return $contact['last-item'];
2046                         }
2047                 }
2048
2049                 if ($lastUpdate = self::updateFromNoScrape($data)) {
2050                         return $lastUpdate;
2051                 }
2052
2053                 if (!empty($data['outbox'])) {
2054                         return self::updateFromOutbox($data['outbox'], $data);
2055                 } elseif (!empty($data['poll']) && ($data['network'] == Protocol::ACTIVITYPUB)) {
2056                         return self::updateFromOutbox($data['poll'], $data);
2057                 } elseif (!empty($data['poll'])) {
2058                         return self::updateFromFeed($data);
2059                 }
2060
2061                 return '';
2062         }
2063
2064         /**
2065          * Fetch the last activity date from the "noscrape" endpoint
2066          *
2067          * @param array $data Probing result
2068          *
2069          * @return string last activity or true if update was successful or the server was unreachable
2070          */
2071         private static function updateFromNoScrape(array $data): string
2072         {
2073                 if (empty($data['baseurl'])) {
2074                         return '';
2075                 }
2076
2077                 // Check the 'noscrape' endpoint when it is a Friendica server
2078                 $gserver = DBA::selectFirst('gserver', ['noscrape'], ["`nurl` = ? AND `noscrape` != ''",
2079                         Strings::normaliseLink($data['baseurl'])]);
2080                 if (!DBA::isResult($gserver)) {
2081                         return '';
2082                 }
2083
2084                 $curlResult = DI::httpClient()->get($gserver['noscrape'] . '/' . $data['nick'], HttpClientAccept::JSON);
2085
2086                 if ($curlResult->isSuccess() && !empty($curlResult->getBody())) {
2087                         $noscrape = json_decode($curlResult->getBody(), true);
2088                         if (!empty($noscrape) && !empty($noscrape['updated'])) {
2089                                 return DateTimeFormat::utc($noscrape['updated'], DateTimeFormat::MYSQL);
2090                         }
2091                 }
2092
2093                 return '';
2094         }
2095
2096         /**
2097          * Fetch the last activity date from an ActivityPub Outbox
2098          *
2099          * @param string $feed
2100          * @param array  $data Probing result
2101          *
2102          * @return string last activity
2103          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2104          */
2105         private static function updateFromOutbox(string $feed, array $data): string
2106         {
2107                 $outbox = ActivityPub::fetchContent($feed);
2108                 if (empty($outbox)) {
2109                         return '';
2110                 }
2111
2112                 if (!empty($outbox['orderedItems'])) {
2113                         $items = $outbox['orderedItems'];
2114                 } elseif (!empty($outbox['first']['orderedItems'])) {
2115                         $items = $outbox['first']['orderedItems'];
2116                 } elseif (!empty($outbox['first']['href']) && ($outbox['first']['href'] != $feed)) {
2117                         return self::updateFromOutbox($outbox['first']['href'], $data);
2118                 } elseif (!empty($outbox['first'])) {
2119                         if (is_string($outbox['first']) && ($outbox['first'] != $feed)) {
2120                                 return self::updateFromOutbox($outbox['first'], $data);
2121                         } else {
2122                                 Logger::warning('Unexpected data', ['outbox' => $outbox]);
2123                         }
2124                         return '';
2125                 } else {
2126                         $items = [];
2127                 }
2128
2129                 $last_updated = '';
2130                 foreach ($items as $activity) {
2131                         if (!empty($activity['published'])) {
2132                                 $published =  DateTimeFormat::utc($activity['published']);
2133                         } elseif (!empty($activity['object']['published'])) {
2134                                 $published =  DateTimeFormat::utc($activity['object']['published']);
2135                         } else {
2136                                 continue;
2137                         }
2138
2139                         if ($last_updated < $published) {
2140                                 $last_updated = $published;
2141                         }
2142                 }
2143
2144                 if (!empty($last_updated)) {
2145                         return $last_updated;
2146                 }
2147
2148                 return '';
2149         }
2150
2151         /**
2152          * Fetch the last activity date from an XML feed
2153          *
2154          * @param array $data Probing result
2155          * @return string last activity
2156          */
2157         private static function updateFromFeed(array $data): string
2158         {
2159                 // Search for the newest entry in the feed
2160                 $curlResult = DI::httpClient()->get($data['poll'], HttpClientAccept::ATOM_XML);
2161                 if (!$curlResult->isSuccess() || !$curlResult->getBody()) {
2162                         return '';
2163                 }
2164
2165                 $doc = new DOMDocument();
2166                 @$doc->loadXML($curlResult->getBody());
2167
2168                 $xpath = new DOMXPath($doc);
2169                 $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
2170
2171                 $entries = $xpath->query('/atom:feed/atom:entry');
2172
2173                 $last_updated = '';
2174
2175                 foreach ($entries as $entry) {
2176                         $published_item = $xpath->query('atom:published/text()', $entry)->item(0);
2177                         $updated_item   = $xpath->query('atom:updated/text()'  , $entry)->item(0);
2178                         $published      = !empty($published_item->nodeValue) ? DateTimeFormat::utc($published_item->nodeValue) : null;
2179                         $updated        = !empty($updated_item->nodeValue) ? DateTimeFormat::utc($updated_item->nodeValue) : null;
2180
2181                         if (empty($published) || empty($updated)) {
2182                                 Logger::notice('Invalid entry for XPath.', ['entry' => $entry, 'url' => $data['url']]);
2183                                 continue;
2184                         }
2185
2186                         if ($last_updated < $published) {
2187                                 $last_updated = $published;
2188                         }
2189
2190                         if ($last_updated < $updated) {
2191                                 $last_updated = $updated;
2192                         }
2193                 }
2194
2195                 if (!empty($last_updated)) {
2196                         return $last_updated;
2197                 }
2198
2199                 return '';
2200         }
2201
2202         /**
2203          * Probe data from local profiles without network traffic
2204          *
2205          * @param string $url
2206          *
2207          * @return array probed data
2208          * @throws HTTPException\InternalServerErrorException
2209          * @throws HTTPException\NotFoundException
2210          */
2211         private static function localProbe(string $url): array
2212         {
2213                 try {
2214                         $uid = User::getIdForURL($url);
2215                         if (!$uid) {
2216                                 throw new HTTPException\NotFoundException('User not found.');
2217                         }
2218
2219                         $owner     = User::getOwnerDataById($uid);
2220                         $approfile = ActivityPub\Transmitter::getProfile($uid);
2221
2222                         $split_name = Diaspora::splitName($owner['name']);
2223
2224                         if (empty($owner['gsid'])) {
2225                                 $owner['gsid'] = GServer::getID($approfile['generator']['url']);
2226                         }
2227
2228                         $data = [
2229                                 'name'             => $owner['name'], 'nick' => $owner['nick'], 'guid' => $approfile['diaspora:guid'] ?? '',
2230                                 'url'              => $owner['url'], 'addr' => $owner['addr'], 'alias' => $owner['alias'],
2231                                 'photo'            => User::getAvatarUrl($owner),
2232                                 'header'           => $owner['header'] ? Contact::getHeaderUrlForId($owner['id'], $owner['updated']) : '',
2233                                 'account-type'     => $owner['contact-type'], 'community' => ($owner['contact-type'] == User::ACCOUNT_TYPE_COMMUNITY),
2234                                 'keywords'         => $owner['keywords'], 'location' => $owner['location'], 'about' => $owner['about'],
2235                                 'xmpp'             => $owner['xmpp'], 'matrix' => $owner['matrix'],
2236                                 'hide'             => !$owner['net-publish'], 'batch' => '', 'notify' => $owner['notify'],
2237                                 'poll'             => $owner['poll'], 'request' => $owner['request'], 'confirm' => $owner['confirm'],
2238                                 'subscribe'        => $approfile['generator']['url'] . '/contact/follow?url={uri}', 'poco' => $owner['poco'],
2239                                 'following'        => $approfile['following'], 'followers' => $approfile['followers'],
2240                                 'inbox'            => $approfile['inbox'], 'outbox' => $approfile['outbox'],
2241                                 'sharedinbox'      => $approfile['endpoints']['sharedInbox'], 'network' => Protocol::DFRN,
2242                                 'pubkey'           => $owner['upubkey'], 'baseurl' => $approfile['generator']['url'], 'gsid' => $owner['gsid'],
2243                                 'manually-approve' => in_array($owner['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]),
2244                                 'networks' => [
2245                                         Protocol::DIASPORA => [
2246                                                 'name'         => $owner['name'],
2247                                                 'given_name'   => $split_name['first'],
2248                                                 'family_name'  => $split_name['last'],
2249                                                 'nick'         => $owner['nick'],
2250                                                 'guid'         => $approfile['diaspora:guid'],
2251                                                 'url'          => $owner['url'],
2252                                                 'addr'         => $owner['addr'],
2253                                                 'alias'        => $owner['alias'],
2254                                                 'photo'        => $owner['photo'],
2255                                                 'photo_medium' => $owner['thumb'],
2256                                                 'photo_small'  => $owner['micro'],
2257                                                 'batch'        => $approfile['generator']['url'] . '/receive/public',
2258                                                 'notify'       => $owner['notify'],
2259                                                 'poll'         => $owner['poll'],
2260                                                 'poco'         => $owner['poco'],
2261                                                 'network'      => Protocol::DIASPORA,
2262                                                 'pubkey'       => $owner['upubkey'],
2263                                         ]
2264                                 ]
2265                         ];
2266                 } catch (Exception $e) {
2267                         // Default values for non existing targets
2268                         $data = [
2269                                 'name' => $url, 'nick' => $url, 'url' => $url, 'network' => Protocol::PHANTOM,
2270                                 'photo' => DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO
2271                         ];
2272                 }
2273
2274                 return self::rearrangeData($data);
2275         }
2276 }