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