src/Network/Probe.php

   1 <?php
   2 /**
   3  * @file src/Network/Probe.php
   4  */
   5 namespace Friendica\Network;
   6
   7 /**
   8  * @file src/Network/Probe.php
   9  * @brief Functions for probing URL
  10  */
  11
  12 use DOMDocument;
  13 use Friendica\Core\Cache;
  14 use Friendica\Core\Config;
  15 use Friendica\Core\Logger;
  16 use Friendica\Core\Protocol;
  17 use Friendica\Core\System;
  18 use Friendica\Database\DBA;
  19 use Friendica\Model\Contact;
  20 use Friendica\Model\Profile;
  21 use Friendica\Protocol\Email;
  22 use Friendica\Protocol\Feed;
  23 use Friendica\Protocol\ActivityPub;
  24 use Friendica\Util\Crypto;
  25 use Friendica\Util\DateTimeFormat;
  26 use Friendica\Util\Network;
  27 use Friendica\Util\Strings;
  28 use Friendica\Util\XML;
  29 use DomXPath;
  30
  31 /**
  32  * @brief This class contain functions for probing URL
  33  *
  34  */
  35 class Probe
  36 {
  37         private static $baseurl;
  38         private static $istimeout;
  39
  40         /**
  41          * @brief Rearrange the array so that it always has the same order
  42          *
  43          * @param array $data Unordered data
  44          *
  45          * @return array Ordered data
  46          */
  47         private static function rearrangeData($data)
  48         {
  49                 $fields = ["name", "nick", "guid", "url", "addr", "alias",
  50                                 "photo", "community", "keywords", "location", "about",
  51                                 "batch", "notify", "poll", "request", "confirm", "poco",
  52                                 "priority", "network", "pubkey", "baseurl"];
  53
  54                 $newdata = [];
  55                 foreach ($fields as $field) {
  56                         if (isset($data[$field])) {
  57                                 $newdata[$field] = $data[$field];
  58                         } else {
  59                                 $newdata[$field] = "";
  60                         }
  61                 }
  62
  63                 // We don't use the "priority" field anymore and replace it with a dummy.
  64                 $newdata["priority"] = 0;
  65
  66                 return $newdata;
  67         }
  68
  69         /**
  70          * @brief Check if the hostname belongs to the own server
  71          *
  72          * @param string $host The hostname that is to be checked
  73          *
  74          * @return bool Does the testes hostname belongs to the own server?
  75          */
  76         private static function ownHost($host)
  77         {
  78                 $own_host = \get_app()->getHostName();
  79
  80                 $parts = parse_url($host);
  81
  82                 if (!isset($parts['scheme'])) {
  83                         $parts = parse_url('http://'.$host);
  84                 }
  85
  86                 if (!isset($parts['host'])) {
  87                         return false;
  88                 }
  89                 return $parts['host'] == $own_host;
  90         }
  91
  92         /**
  93          * @brief Probes for webfinger path via "host-meta"
  94          *
  95          * We have to check if the servers in the future still will offer this.
  96          * It seems as if it was dropped from the standard.
  97          *
  98          * @param string $host The host part of an url
  99          *
 100          * @return array with template and type of the webfinger template for JSON or XML
 101          * @throws HTTPException\InternalServerErrorException
 102          */
 103         private static function hostMeta($host)
 104         {
 105                 // Reset the static variable
 106                 self::$baseurl = '';
 107
 108                 $ssl_url = "https://".$host."/.well-known/host-meta";
 109                 $url = "http://".$host."/.well-known/host-meta";
 110
 111                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 112                 $redirects = 0;
 113
 114                 Logger::log("Probing for ".$host, Logger::DEBUG);
 115                 $xrd = null;
 116
 117                 $curlResult = Network::curl($ssl_url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 118                 if ($curlResult->isSuccess()) {
 119                         $xml = $curlResult->getBody();
 120                         $xrd = XML::parseString($xml, false);
 121                         $host_url = 'https://'.$host;
 122                 }
 123
 124                 if (!is_object($xrd)) {
 125                         $curlResult = Network::curl($url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 126                         if ($curlResult->isTimeout()) {
 127                                 Logger::log("Probing timeout for " . $url, Logger::DEBUG);
 128                                 self::$istimeout = true;
 129                                 return false;
 130                         }
 131                         $xml = $curlResult->getBody();
 132                         $xrd = XML::parseString($xml, false);
 133                         $host_url = 'http://'.$host;
 134                 }
 135                 if (!is_object($xrd)) {
 136                         Logger::log("No xrd object found for ".$host, Logger::DEBUG);
 137                         return [];
 138                 }
 139
 140                 $links = XML::elementToArray($xrd);
 141                 if (!isset($links["xrd"]["link"])) {
 142                         Logger::log("No xrd data found for ".$host, Logger::DEBUG);
 143                         return [];
 144                 }
 145
 146                 $lrdd = [];
 147                 // The following webfinger path is defined in RFC 7033 https://tools.ietf.org/html/rfc7033
 148                 // Problem is that Hubzilla currently doesn't provide all data in the JSON webfinger
 149                 // compared to the XML webfinger. So this is commented out by now.
 150                 // $lrdd = array("application/jrd+json" => $host_url.'/.well-known/webfinger?resource={uri}');
 151
 152                 foreach ($links["xrd"]["link"] as $value => $link) {
 153                         if (!empty($link["@attributes"])) {
 154                                 $attributes = $link["@attributes"];
 155                         } elseif ($value == "@attributes") {
 156                                 $attributes = $link;
 157                         } else {
 158                                 continue;
 159                         }
 160
 161                         if (!empty($attributes["rel"]) && $attributes["rel"] == "lrdd" && !empty($attributes["template"])) {
 162                                 $type = (empty($attributes["type"]) ? '' : $attributes["type"]);
 163
 164                                 $lrdd[$type] = $attributes["template"];
 165                         }
 166                 }
 167
 168                 self::$baseurl = $host_url;
 169
 170                 Logger::log("Probing successful for ".$host, Logger::DEBUG);
 171
 172                 return $lrdd;
 173         }
 174
 175         /**
 176          * @brief Perform Webfinger lookup and return DFRN data
 177          *
 178          * Given an email style address, perform webfinger lookup and
 179          * return the resulting DFRN profile URL, or if no DFRN profile URL
 180          * is located, returns an OStatus subscription template (prefixed
 181          * with the string 'stat:' to identify it as on OStatus template).
 182          * If this isn't an email style address just return $webbie.
 183          * Return an empty string if email-style addresses but webfinger fails,
 184          * or if the resultant personal XRD doesn't contain a supported
 185          * subscription/friend-request attribute.
 186          *
 187          * amended 7/9/2011 to return an hcard which could save potentially loading
 188          * a lengthy content page to scrape dfrn attributes
 189          *
 190          * @param string $webbie    Address that should be probed
 191          * @param string $hcard_url Link to the hcard - is returned by reference
 192          *
 193          * @return string profile link
 194          * @throws HTTPException\InternalServerErrorException
 195          */
 196         public static function webfingerDfrn($webbie, &$hcard_url)
 197         {
 198                 $profile_link = '';
 199
 200                 $links = self::lrdd($webbie);
 201                 Logger::log('webfingerDfrn: '.$webbie.':'.print_r($links, true), Logger::DATA);
 202                 if (count($links)) {
 203                         foreach ($links as $link) {
 204                                 if ($link['@attributes']['rel'] === NAMESPACE_DFRN) {
 205                                         $profile_link = $link['@attributes']['href'];
 206                                 }
 207                                 if (($link['@attributes']['rel'] === NAMESPACE_OSTATUSSUB) && ($profile_link == "")) {
 208                                         $profile_link = 'stat:'.$link['@attributes']['template'];
 209                                 }
 210                                 if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
 211                                         $hcard_url = $link['@attributes']['href'];
 212                                 }
 213                         }
 214                 }
 215                 return $profile_link;
 216         }
 217
 218         /**
 219          * @brief Check an URI for LRDD data
 220          *
 221          * this is a replacement for the "lrdd" function.
 222          * It isn't used in this class and has some redundancies in the code.
 223          * When time comes we can check the existing calls for "lrdd" if we can rework them.
 224          *
 225          * @param string $uri Address that should be probed
 226          *
 227          * @return array uri data
 228          * @throws HTTPException\InternalServerErrorException
 229          */
 230         public static function lrdd($uri)
 231         {
 232                 $lrdd = self::hostMeta($uri);
 233                 $webfinger = null;
 234
 235                 if (is_bool($lrdd)) {
 236                         return [];
 237                 }
 238
 239                 if (!$lrdd) {
 240                         $parts = @parse_url($uri);
 241                         if (!$parts || empty($parts["host"]) || empty($parts["path"])) {
 242                                 return [];
 243                         }
 244
 245                         $host = $parts["host"];
 246                         if (!empty($parts["port"])) {
 247                                 $host .= ':'.$parts["port"];
 248                         }
 249
 250                         $path_parts = explode("/", trim($parts["path"], "/"));
 251
 252                         $nick = array_pop($path_parts);
 253
 254                         do {
 255                                 $lrdd = self::hostMeta($host);
 256                                 $host .= "/".array_shift($path_parts);
 257                         } while (!$lrdd && (sizeof($path_parts) > 0));
 258                 }
 259
 260                 if (!$lrdd) {
 261                         Logger::log("No lrdd data found for ".$uri, Logger::DEBUG);
 262                         return [];
 263                 }
 264
 265                 foreach ($lrdd as $type => $template) {
 266                         if ($webfinger) {
 267                                 continue;
 268                         }
 269
 270                         $path = str_replace('{uri}', urlencode($uri), $template);
 271                         $webfinger = self::webfinger($path, $type);
 272
 273                         if (!$webfinger && (strstr($uri, "@"))) {
 274                                 $path = str_replace('{uri}', urlencode("acct:".$uri), $template);
 275                                 $webfinger = self::webfinger($path, $type);
 276                         }
 277
 278                         // Special treatment for Mastodon
 279                         // Problem is that Mastodon uses an URL format like http://domain.tld/@nick
 280                         // But the webfinger for this format fails.
 281                         if (!$webfinger && !empty($nick)) {
 282                                 // Mastodon uses a "@" as prefix for usernames in their url format
 283                                 $nick = ltrim($nick, '@');
 284
 285                                 $addr = $nick."@".$host;
 286
 287                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 288                                 $webfinger = self::webfinger($path, $type);
 289                         }
 290                 }
 291
 292                 if (!is_array($webfinger["links"])) {
 293                         Logger::log("No webfinger links found for ".$uri, Logger::DEBUG);
 294                         return false;
 295                 }
 296
 297                 $data = [];
 298
 299                 foreach ($webfinger["links"] as $link) {
 300                         $data[] = ["@attributes" => $link];
 301                 }
 302
 303                 if (is_array($webfinger["aliases"])) {
 304                         foreach ($webfinger["aliases"] as $alias) {
 305                                 $data[] = ["@attributes" =>
 306                                                         ["rel" => "alias",
 307                                                                 "href" => $alias]];
 308                         }
 309                 }
 310
 311                 return $data;
 312         }
 313
 314         /**
 315          * @brief Fetch information (protocol endpoints and user information) about a given uri
 316          *
 317          * @param string  $uri     Address that should be probed
 318          * @param string  $network Test for this specific network
 319          * @param integer $uid     User ID for the probe (only used for mails)
 320          * @param boolean $cache   Use cached values?
 321          *
 322          * @return array uri data
 323          * @throws HTTPException\InternalServerErrorException
 324          * @throws \ImagickException
 325          */
 326         public static function uri($uri, $network = '', $uid = -1, $cache = true)
 327         {
 328                 if ($cache) {
 329                         $result = Cache::get('Probe::uri:' . $network . ':' . $uri);
 330                         if (!is_null($result)) {
 331                                 return $result;
 332                         }
 333                 }
 334
 335                 if ($uid == -1) {
 336                         $uid = local_user();
 337                 }
 338
 339                 self::$istimeout = false;
 340
 341                 if ($network != Protocol::ACTIVITYPUB) {
 342                         $data = self::detect($uri, $network, $uid);
 343                 } else {
 344                         $data = null;
 345                 }
 346
 347                 // When the previous detection process had got a time out
 348                 // we could falsely detect a Friendica profile as AP profile.
 349                 if (!self::$istimeout) {
 350                         $ap_profile = ActivityPub::probeProfile($uri);
 351
 352                         if (!empty($ap_profile) && empty($network) && (defaults($data, 'network', '') != Protocol::DFRN)) {
 353                                 $data = $ap_profile;
 354                         }
 355                 } else {
 356                         Logger::notice('Time out detected. AP will not be probed.', ['uri' => $uri]);
 357                 }
 358
 359                 if (!isset($data['url'])) {
 360                         $data['url'] = $uri;
 361                 }
 362
 363                 if (!empty($data['photo'])) {
 364                         $data['baseurl'] = Network::getUrlMatch(Strings::normaliseLink(defaults($data, 'baseurl', '')), Strings::normaliseLink($data['photo']));
 365                 } else {
 366                         $data['photo'] = System::baseUrl() . '/images/person-300.jpg';
 367                 }
 368
 369                 if (empty($data['name'])) {
 370                         if (!empty($data['nick'])) {
 371                                 $data['name'] = $data['nick'];
 372                         }
 373
 374                         if (empty($data['name'])) {
 375                                 $data['name'] = $data['url'];
 376                         }
 377                 }
 378
 379                 if (empty($data['nick'])) {
 380                         $data['nick'] = strtolower($data['name']);
 381
 382                         if (strpos($data['nick'], ' ')) {
 383                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 384                         }
 385                 }
 386
 387                 if (!empty(self::$baseurl)) {
 388                         $data['baseurl'] = self::$baseurl;
 389                 }
 390
 391                 if (empty($data['network'])) {
 392                         $data['network'] = Protocol::PHANTOM;
 393                 }
 394
 395                 $data = self::rearrangeData($data);
 396
 397                 // Only store into the cache if the value seems to be valid
 398                 if (!in_array($data['network'], [Protocol::PHANTOM, Protocol::MAIL])) {
 399                         Cache::set('Probe::uri:' . $network . ':' . $uri, $data, Cache::DAY);
 400
 401                         /// @todo temporary fix - we need a real contact update function that updates only changing fields
 402                         /// The biggest problem is the avatar picture that could have a reduced image size.
 403                         /// It should only be updated if the existing picture isn't existing anymore.
 404                         /// We only update the contact when it is no probing for a specific network.
 405                         if (($data['network'] != Protocol::FEED)
 406                                 && ($network == '')
 407                                 && $data['name']
 408                                 && $data['nick']
 409                                 && $data['url']
 410                                 && $data['addr']
 411                                 && $data['poll']
 412                         ) {
 413                                 $fields = [
 414                                         'name' => $data['name'],
 415                                         'nick' => $data['nick'],
 416                                         'url' => $data['url'],
 417                                         'addr' => $data['addr'],
 418                                         'photo' => $data['photo'],
 419                                         'keywords' => $data['keywords'],
 420                                         'location' => $data['location'],
 421                                         'about' => $data['about'],
 422                                         'notify' => $data['notify'],
 423                                         'network' => $data['network'],
 424                                         'server_url' => $data['baseurl']
 425                                 ];
 426
 427                                 // This doesn't cover the case when a community isn't a community anymore
 428                                 if (!empty($data['community']) && $data['community']) {
 429                                         $fields['community'] = $data['community'];
 430                                         $fields['contact-type'] = Contact::TYPE_COMMUNITY;
 431                                 }
 432
 433                                 $fieldnames = [];
 434
 435                                 foreach ($fields as $key => $val) {
 436                                         if (empty($val)) {
 437                                                 unset($fields[$key]);
 438                                         } else {
 439                                                 $fieldnames[] = $key;
 440                                         }
 441                                 }
 442
 443                                 $fields['updated'] = DateTimeFormat::utcNow();
 444
 445                                 $condition = ['nurl' => Strings::normaliseLink($data['url'])];
 446
 447                                 $old_fields = DBA::selectFirst('gcontact', $fieldnames, $condition);
 448
 449                                 // When the gcontact doesn't exist, the value "true" will trigger an insert.
 450                                 // In difference to the public contacts we want to have every contact
 451                                 // in the world in our global contacts.
 452                                 if (!$old_fields) {
 453                                         $old_fields = true;
 454
 455                                         // These values have to be set only on insert
 456                                         $fields['photo'] = $data['photo'];
 457                                         $fields['created'] = DateTimeFormat::utcNow();
 458                                 }
 459
 460                                 DBA::update('gcontact', $fields, $condition, $old_fields);
 461
 462                                 $fields = [
 463                                         'name' => $data['name'],
 464                                         'nick' => $data['nick'],
 465                                         'url' => $data['url'],
 466                                         'addr' => $data['addr'],
 467                                         'alias' => $data['alias'],
 468                                         'keywords' => $data['keywords'],
 469                                         'location' => $data['location'],
 470                                         'about' => $data['about'],
 471                                         'batch' => $data['batch'],
 472                                         'notify' => $data['notify'],
 473                                         'poll' => $data['poll'],
 474                                         'request' => $data['request'],
 475                                         'confirm' => $data['confirm'],
 476                                         'poco' => $data['poco'],
 477                                         'network' => $data['network'],
 478                                         'pubkey' => $data['pubkey'],
 479                                         'priority' => $data['priority'],
 480                                         'writable' => true,
 481                                         'rel' => Contact::SHARING
 482                                 ];
 483
 484                                 $fieldnames = [];
 485
 486                                 foreach ($fields as $key => $val) {
 487                                         if (empty($val)) {
 488                                                 unset($fields[$key]);
 489                                         } else {
 490                                                 $fieldnames[] = $key;
 491                                         }
 492                                 }
 493
 494                                 $condition = ['nurl' => Strings::normaliseLink($data['url']), 'self' => false, 'uid' => 0];
 495
 496                                 // "$old_fields" will return a "false" when the contact doesn't exist.
 497                                 // This won't trigger an insert. This is intended, since we only need
 498                                 // public contacts for everyone we store items from.
 499                                 // We don't need to store every contact on the planet.
 500                                 $old_fields = DBA::selectFirst('contact', $fieldnames, $condition);
 501
 502                                 $fields['name-date'] = DateTimeFormat::utcNow();
 503                                 $fields['uri-date'] = DateTimeFormat::utcNow();
 504                                 $fields['success_update'] = DateTimeFormat::utcNow();
 505
 506                                 DBA::update('contact', $fields, $condition, $old_fields);
 507                         }
 508                 }
 509
 510                 return $data;
 511         }
 512
 513         /**
 514          * @brief Switch the scheme of an url between http and https
 515          *
 516          * @param string $url URL
 517          *
 518          * @return string switched URL
 519          */
 520         private static function switchScheme($url)
 521         {
 522                 $parts = parse_url($url);
 523
 524                 if (!isset($parts['scheme'])) {
 525                         return $url;
 526                 }
 527
 528                 if ($parts['scheme'] == 'http') {
 529                         $url = str_replace('http://', 'https://', $url);
 530                 } elseif ($parts['scheme'] == 'https') {
 531                         $url = str_replace('https://', 'http://', $url);
 532                 }
 533
 534                 return $url;
 535         }
 536
 537         /**
 538          * @brief Checks if a profile url should be OStatus but only provides partial information
 539          *
 540          * @param array  $webfinger Webfinger data
 541          * @param string $lrdd      Path template for webfinger request
 542          * @param string $type      type
 543          *
 544          * @return array fixed webfinger data
 545          * @throws HTTPException\InternalServerErrorException
 546          */
 547         private static function fixOStatus($webfinger, $lrdd, $type)
 548         {
 549                 if (empty($webfinger['links']) || empty($webfinger['subject'])) {
 550                         return $webfinger;
 551                 }
 552
 553                 $is_ostatus = false;
 554                 $has_key = false;
 555
 556                 foreach ($webfinger['links'] as $link) {
 557                         if ($link['rel'] == NAMESPACE_OSTATUSSUB) {
 558                                 $is_ostatus = true;
 559                         }
 560                         if ($link['rel'] == 'magic-public-key') {
 561                                 $has_key = true;
 562                         }
 563                 }
 564
 565                 if (!$is_ostatus || $has_key) {
 566                         return $webfinger;
 567                 }
 568
 569                 $url = self::switchScheme($webfinger['subject']);
 570                 $path = str_replace('{uri}', urlencode($url), $lrdd);
 571                 $webfinger2 = self::webfinger($path, $type);
 572
 573                 // Is the new webfinger detectable as OStatus?
 574                 if (self::ostatus($webfinger2, true)) {
 575                         $webfinger = $webfinger2;
 576                 }
 577
 578                 return $webfinger;
 579         }
 580
 581         /**
 582          * @brief Fetch information (protocol endpoints and user information) about a given uri
 583          *
 584          * This function is only called by the "uri" function that adds caching and rearranging of data.
 585          *
 586          * @param string  $uri     Address that should be probed
 587          * @param string  $network Test for this specific network
 588          * @param integer $uid     User ID for the probe (only used for mails)
 589          *
 590          * @return array uri data
 591          * @throws HTTPException\InternalServerErrorException
 592          */
 593         private static function detect($uri, $network, $uid)
 594         {
 595                 $parts = parse_url($uri);
 596
 597                 if (!empty($parts["scheme"]) && !empty($parts["host"])) {
 598                         $host = $parts["host"];
 599                         if (!empty($parts["port"])) {
 600                                 $host .= ':'.$parts["port"];
 601                         }
 602
 603                         if ($host == 'twitter.com') {
 604                                 return ["network" => Protocol::TWITTER];
 605                         }
 606                         $lrdd = self::hostMeta($host);
 607
 608                         if (is_bool($lrdd)) {
 609                                 return [];
 610                         }
 611
 612                         $path_parts = explode("/", trim(defaults($parts, 'path', ''), "/"));
 613
 614                         while (!$lrdd && (sizeof($path_parts) > 1)) {
 615                                 $host .= "/".array_shift($path_parts);
 616                                 $lrdd = self::hostMeta($host);
 617                         }
 618                         if (!$lrdd) {
 619                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 620                                 return self::feed($uri);
 621                         }
 622                         $nick = array_pop($path_parts);
 623
 624                         // Mastodon uses a "@" as prefix for usernames in their url format
 625                         $nick = ltrim($nick, '@');
 626
 627                         $addr = $nick."@".$host;
 628                 } elseif (strstr($uri, '@')) {
 629                         // If the URI starts with "mailto:" then jump directly to the mail detection
 630                         if (strpos($uri, 'mailto:') !== false) {
 631                                 $uri = str_replace('mailto:', '', $uri);
 632                                 return self::mail($uri, $uid);
 633                         }
 634
 635                         if ($network == Protocol::MAIL) {
 636                                 return self::mail($uri, $uid);
 637                         }
 638                         // Remove "acct:" from the URI
 639                         $uri = str_replace('acct:', '', $uri);
 640
 641                         $host = substr($uri, strpos($uri, '@') + 1);
 642                         $nick = substr($uri, 0, strpos($uri, '@'));
 643
 644                         if (strpos($uri, '@twitter.com')) {
 645                                 return ["network" => Protocol::TWITTER];
 646                         }
 647                         $lrdd = self::hostMeta($host);
 648
 649                         if (is_bool($lrdd)) {
 650                                 return [];
 651                         }
 652
 653                         if (!$lrdd) {
 654                                 Logger::log('No XRD data was found for '.$uri, Logger::DEBUG);
 655                                 return self::mail($uri, $uid);
 656                         }
 657                         $addr = $uri;
 658                 } else {
 659                         Logger::log("Uri ".$uri." was not detectable", Logger::DEBUG);
 660                         return false;
 661                 }
 662
 663                 $webfinger = false;
 664
 665                 /// @todo Do we need the prefix "acct:" or "acct://"?
 666
 667                 foreach ($lrdd as $type => $template) {
 668                         if ($webfinger) {
 669                                 continue;
 670                         }
 671
 672                         // At first try it with the given uri
 673                         $path = str_replace('{uri}', urlencode($uri), $template);
 674                         $webfinger = self::webfinger($path, $type);
 675
 676                         // Fix possible problems with GNU Social probing to wrong scheme
 677                         $webfinger = self::fixOStatus($webfinger, $template, $type);
 678
 679                         // We cannot be sure that the detected address was correct, so we don't use the values
 680                         if ($webfinger && ($uri != $addr)) {
 681                                 $nick = "";
 682                                 $addr = "";
 683                         }
 684
 685                         // Try webfinger with the address (user@domain.tld)
 686                         if (!$webfinger) {
 687                                 $path = str_replace('{uri}', urlencode($addr), $template);
 688                                 $webfinger = self::webfinger($path, $type);
 689                         }
 690
 691                         // Mastodon needs to have it with "acct:"
 692                         if (!$webfinger) {
 693                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 694                                 $webfinger = self::webfinger($path, $type);
 695                         }
 696                 }
 697
 698                 if (!$webfinger) {
 699                         return self::feed($uri);
 700                 }
 701
 702                 $result = false;
 703
 704                 Logger::log("Probing ".$uri, Logger::DEBUG);
 705
 706                 if (in_array($network, ["", Protocol::DFRN])) {
 707                         $result = self::dfrn($webfinger);
 708                 }
 709                 if ((!$result && ($network == "")) || ($network == Protocol::DIASPORA)) {
 710                         $result = self::diaspora($webfinger);
 711                 }
 712                 if ((!$result && ($network == "")) || ($network == Protocol::OSTATUS)) {
 713                         $result = self::ostatus($webfinger);
 714                 }
 715                 if ((!$result && ($network == "")) || ($network == Protocol::PUMPIO)) {
 716                         $result = self::pumpio($webfinger, $addr);
 717                 }
 718                 if ((!$result && ($network == "")) || ($network == Protocol::FEED)) {
 719                         $result = self::feed($uri);
 720                 } else {
 721                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 722                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 723                         if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
 724                                 $result["nick"] = $nick;
 725                         }
 726
 727                         if (empty($result["addr"]) && ($addr != "")) {
 728                                 $result["addr"] = $addr;
 729                         }
 730                 }
 731
 732                 if (empty($result["network"])) {
 733                         $result["network"] = Protocol::PHANTOM;
 734                 }
 735
 736                 if (empty($result["url"])) {
 737                         $result["url"] = $uri;
 738                 }
 739
 740                 Logger::log($uri." is ".$result["network"], Logger::DEBUG);
 741
 742                 if (empty($result["baseurl"])) {
 743                         $pos = strpos($result["url"], $host);
 744                         if ($pos) {
 745                                 $result["baseurl"] = substr($result["url"], 0, $pos).$host;
 746                         }
 747                 }
 748                 return $result;
 749         }
 750
 751         /**
 752          * @brief Perform a webfinger request.
 753          *
 754          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 755          *
 756          * @param string $url  Address that should be probed
 757          * @param string $type type
 758          *
 759          * @return array webfinger data
 760          * @throws HTTPException\InternalServerErrorException
 761          */
 762         private static function webfinger($url, $type)
 763         {
 764                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 765                 $redirects = 0;
 766
 767                 $curlResult = Network::curl($url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => $type]);
 768                 if ($curlResult->isTimeout()) {
 769                         self::$istimeout = true;
 770                         return false;
 771                 }
 772                 $data = $curlResult->getBody();
 773
 774                 $webfinger = json_decode($data, true);
 775                 if (is_array($webfinger)) {
 776                         if (!isset($webfinger["links"])) {
 777                                 Logger::log("No json webfinger links for ".$url, Logger::DEBUG);
 778                                 return false;
 779                         }
 780                         return $webfinger;
 781                 }
 782
 783                 // If it is not JSON, maybe it is XML
 784                 $xrd = XML::parseString($data, false);
 785                 if (!is_object($xrd)) {
 786                         Logger::log("No webfinger data retrievable for ".$url, Logger::DEBUG);
 787                         return false;
 788                 }
 789
 790                 $xrd_arr = XML::elementToArray($xrd);
 791                 if (!isset($xrd_arr["xrd"]["link"])) {
 792                         Logger::log("No XML webfinger links for ".$url, Logger::DEBUG);
 793                         return false;
 794                 }
 795
 796                 $webfinger = [];
 797
 798                 if (!empty($xrd_arr["xrd"]["subject"])) {
 799                         $webfinger["subject"] = $xrd_arr["xrd"]["subject"];
 800                 }
 801
 802                 if (!empty($xrd_arr["xrd"]["alias"])) {
 803                         $webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
 804                 }
 805
 806                 $webfinger["links"] = [];
 807
 808                 foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
 809                         if (!empty($data["@attributes"])) {
 810                                 $attributes = $data["@attributes"];
 811                         } elseif ($value == "@attributes") {
 812                                 $attributes = $data;
 813                         } else {
 814                                 continue;
 815                         }
 816
 817                         $webfinger["links"][] = $attributes;
 818                 }
 819                 return $webfinger;
 820         }
 821
 822         /**
 823          * @brief Poll the Friendica specific noscrape page.
 824          *
 825          * "noscrape" is a faster alternative to fetch the data from the hcard.
 826          * This functionality was originally created for the directory.
 827          *
 828          * @param string $noscrape_url Link to the noscrape page
 829          * @param array  $data         The already fetched data
 830          *
 831          * @return array noscrape data
 832          * @throws HTTPException\InternalServerErrorException
 833          */
 834         private static function pollNoscrape($noscrape_url, $data)
 835         {
 836                 $curlResult = Network::curl($noscrape_url);
 837                 if ($curlResult->isTimeout()) {
 838                         self::$istimeout = true;
 839                         return false;
 840                 }
 841                 $content = $curlResult->getBody();
 842                 if (!$content) {
 843                         Logger::log("Empty body for ".$noscrape_url, Logger::DEBUG);
 844                         return false;
 845                 }
 846
 847                 $json = json_decode($content, true);
 848                 if (!is_array($json)) {
 849                         Logger::log("No json data for ".$noscrape_url, Logger::DEBUG);
 850                         return false;
 851                 }
 852
 853                 if (!empty($json["fn"])) {
 854                         $data["name"] = $json["fn"];
 855                 }
 856
 857                 if (!empty($json["addr"])) {
 858                         $data["addr"] = $json["addr"];
 859                 }
 860
 861                 if (!empty($json["nick"])) {
 862                         $data["nick"] = $json["nick"];
 863                 }
 864
 865                 if (!empty($json["guid"])) {
 866                         $data["guid"] = $json["guid"];
 867                 }
 868
 869                 if (!empty($json["comm"])) {
 870                         $data["community"] = $json["comm"];
 871                 }
 872
 873                 if (!empty($json["tags"])) {
 874                         $keywords = implode(" ", $json["tags"]);
 875                         if ($keywords != "") {
 876                                 $data["keywords"] = $keywords;
 877                         }
 878                 }
 879
 880                 $location = Profile::formatLocation($json);
 881                 if ($location) {
 882                         $data["location"] = $location;
 883                 }
 884
 885                 if (!empty($json["about"])) {
 886                         $data["about"] = $json["about"];
 887                 }
 888
 889                 if (!empty($json["key"])) {
 890                         $data["pubkey"] = $json["key"];
 891                 }
 892
 893                 if (!empty($json["photo"])) {
 894                         $data["photo"] = $json["photo"];
 895                 }
 896
 897                 if (!empty($json["dfrn-request"])) {
 898                         $data["request"] = $json["dfrn-request"];
 899                 }
 900
 901                 if (!empty($json["dfrn-confirm"])) {
 902                         $data["confirm"] = $json["dfrn-confirm"];
 903                 }
 904
 905                 if (!empty($json["dfrn-notify"])) {
 906                         $data["notify"] = $json["dfrn-notify"];
 907                 }
 908
 909                 if (!empty($json["dfrn-poll"])) {
 910                         $data["poll"] = $json["dfrn-poll"];
 911                 }
 912
 913                 return $data;
 914         }
 915
 916         /**
 917          * @brief Check for valid DFRN data
 918          *
 919          * @param array $data DFRN data
 920          *
 921          * @return int Number of errors
 922          */
 923         public static function validDfrn($data)
 924         {
 925                 $errors = 0;
 926                 if (!isset($data['key'])) {
 927                         $errors ++;
 928                 }
 929                 if (!isset($data['dfrn-request'])) {
 930                         $errors ++;
 931                 }
 932                 if (!isset($data['dfrn-confirm'])) {
 933                         $errors ++;
 934                 }
 935                 if (!isset($data['dfrn-notify'])) {
 936                         $errors ++;
 937                 }
 938                 if (!isset($data['dfrn-poll'])) {
 939                         $errors ++;
 940                 }
 941                 return $errors;
 942         }
 943
 944         /**
 945          * @brief Fetch data from a DFRN profile page and via "noscrape"
 946          *
 947          * @param string $profile_link Link to the profile page
 948          *
 949          * @return array profile data
 950          * @throws HTTPException\InternalServerErrorException
 951          * @throws \ImagickException
 952          */
 953         public static function profile($profile_link)
 954         {
 955                 $data = [];
 956
 957                 Logger::log("Check profile ".$profile_link, Logger::DEBUG);
 958
 959                 // Fetch data via noscrape - this is faster
 960                 $noscrape_url = str_replace(["/hcard/", "/profile/"], "/noscrape/", $profile_link);
 961                 $data = self::pollNoscrape($noscrape_url, $data);
 962
 963                 if (!isset($data["notify"])
 964                         || !isset($data["confirm"])
 965                         || !isset($data["request"])
 966                         || !isset($data["poll"])
 967                         || !isset($data["name"])
 968                         || !isset($data["photo"])
 969                 ) {
 970                         $data = self::pollHcard($profile_link, $data, true);
 971                 }
 972
 973                 $prof_data = [];
 974
 975                 if (empty($data["addr"]) || empty($data["nick"])) {
 976                         $probe_data = self::uri($profile_link);
 977                         $data["addr"] = defaults($data, "addr", $probe_data["addr"]);
 978                         $data["nick"] = defaults($data, "nick", $probe_data["nick"]);
 979                 }
 980
 981                 $prof_data["addr"]         = $data["addr"];
 982                 $prof_data["nick"]         = $data["nick"];
 983                 $prof_data["dfrn-request"] = defaults($data, 'request', null);
 984                 $prof_data["dfrn-confirm"] = defaults($data, 'confirm', null);
 985                 $prof_data["dfrn-notify"]  = defaults($data, 'notify' , null);
 986                 $prof_data["dfrn-poll"]    = defaults($data, 'poll'   , null);
 987                 $prof_data["photo"]        = defaults($data, 'photo'  , null);
 988                 $prof_data["fn"]           = defaults($data, 'name'   , null);
 989                 $prof_data["key"]          = defaults($data, 'pubkey' , null);
 990
 991                 Logger::log("Result for profile ".$profile_link.": ".print_r($prof_data, true), Logger::DEBUG);
 992
 993                 return $prof_data;
 994         }
 995
 996         /**
 997          * @brief Check for DFRN contact
 998          *
 999          * @param array $webfinger Webfinger data
1000          *
1001          * @return array DFRN data
1002          * @throws HTTPException\InternalServerErrorException
1003          */
1004         private static function dfrn($webfinger)
1005         {
1006                 $hcard_url = "";
1007                 $data = [];
1008                 // The array is reversed to take into account the order of preference for same-rel links
1009                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1010                 foreach (array_reverse($webfinger["links"]) as $link) {
1011                         if (($link["rel"] == NAMESPACE_DFRN) && !empty($link["href"])) {
1012                                 $data["network"] = Protocol::DFRN;
1013                         } elseif (($link["rel"] == NAMESPACE_FEED) && !empty($link["href"])) {
1014                                 $data["poll"] = $link["href"];
1015                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (defaults($link, "type", "") == "text/html") && !empty($link["href"])) {
1016                                 $data["url"] = $link["href"];
1017                         } elseif (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1018                                 $hcard_url = $link["href"];
1019                         } elseif (($link["rel"] == NAMESPACE_POCO) && !empty($link["href"])) {
1020                                 $data["poco"] = $link["href"];
1021                         } elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && !empty($link["href"])) {
1022                                 $data["photo"] = $link["href"];
1023                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1024                                 $data["baseurl"] = trim($link["href"], '/');
1025                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1026                                 $data["guid"] = $link["href"];
1027                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1028                                 $data["pubkey"] = base64_decode($link["href"]);
1029
1030                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1031                                 if (strstr($data["pubkey"], 'RSA ')) {
1032                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1033                                 }
1034                         }
1035                 }
1036
1037                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1038                         foreach ($webfinger["aliases"] as $alias) {
1039                                 if (empty($data["url"]) && !strstr($alias, "@")) {
1040                                         $data["url"] = $alias;
1041                                 } elseif (!strstr($alias, "@") && Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"])) {
1042                                         $data["alias"] = $alias;
1043                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1044                                         $data["addr"] = substr($alias, 5);
1045                                 }
1046                         }
1047                 }
1048
1049                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == "acct:")) {
1050                         $data["addr"] = substr($webfinger["subject"], 5);
1051                 }
1052
1053                 if (!isset($data["network"]) || ($hcard_url == "")) {
1054                         return false;
1055                 }
1056
1057                 // Fetch data via noscrape - this is faster
1058                 $noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
1059                 $data = self::pollNoscrape($noscrape_url, $data);
1060
1061                 if (isset($data["notify"])
1062                         && isset($data["confirm"])
1063                         && isset($data["request"])
1064                         && isset($data["poll"])
1065                         && isset($data["name"])
1066                         && isset($data["photo"])
1067                 ) {
1068                         return $data;
1069                 }
1070
1071                 $data = self::pollHcard($hcard_url, $data, true);
1072
1073                 return $data;
1074         }
1075
1076         /**
1077          * @brief Poll the hcard page (Diaspora and Friendica specific)
1078          *
1079          * @param string  $hcard_url Link to the hcard page
1080          * @param array   $data      The already fetched data
1081          * @param boolean $dfrn      Poll DFRN specific data
1082          *
1083          * @return array hcard data
1084          * @throws HTTPException\InternalServerErrorException
1085          */
1086         private static function pollHcard($hcard_url, $data, $dfrn = false)
1087         {
1088                 $curlResult = Network::curl($hcard_url);
1089                 if ($curlResult->isTimeout()) {
1090                         self::$istimeout = true;
1091                         return false;
1092                 }
1093                 $content = $curlResult->getBody();
1094                 if (!$content) {
1095                         return false;
1096                 }
1097
1098                 $doc = new DOMDocument();
1099                 if (!@$doc->loadHTML($content)) {
1100                         return false;
1101                 }
1102
1103                 $xpath = new DomXPath($doc);
1104
1105                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1106                 if (!is_object($vcards)) {
1107                         return false;
1108                 }
1109
1110                 if (!isset($data["baseurl"])) {
1111                         $data["baseurl"] = "";
1112                 }
1113
1114                 if ($vcards->length > 0) {
1115                         $vcard = $vcards->item(0);
1116
1117                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1118                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1119                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1120                         if (($search->length > 0) && empty($data["guid"])) {
1121                                 $data["guid"] = $search->item(0)->nodeValue;
1122                         }
1123
1124                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1125                         if ($search->length > 0) {
1126                                 $data["nick"] = $search->item(0)->nodeValue;
1127                         }
1128
1129                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1130                         if ($search->length > 0) {
1131                                 $data["name"] = $search->item(0)->nodeValue;
1132                         }
1133
1134                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1135                         if ($search->length > 0) {
1136                                 $data["searchable"] = $search->item(0)->nodeValue;
1137                         }
1138
1139                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1140                         if ($search->length > 0) {
1141                                 $data["pubkey"] = $search->item(0)->nodeValue;
1142                                 if (strstr($data["pubkey"], 'RSA ')) {
1143                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1144                                 }
1145                         }
1146
1147                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1148                         if ($search->length > 0) {
1149                                 $data["baseurl"] = trim($search->item(0)->nodeValue, "/");
1150                         }
1151                 }
1152
1153                 $avatar = [];
1154                 if (!empty($vcard)) {
1155                         $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1156                         foreach ($photos as $photo) {
1157                                 $attr = [];
1158                                 foreach ($photo->attributes as $attribute) {
1159                                         $attr[$attribute->name] = trim($attribute->value);
1160                                 }
1161
1162                                 if (isset($attr["src"]) && isset($attr["width"])) {
1163                                         $avatar[$attr["width"]] = $attr["src"];
1164                                 }
1165
1166                                 // We don't have a width. So we just take everything that we got.
1167                                 // This is a Hubzilla workaround which doesn't send a width.
1168                                 if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
1169                                         $avatar[] = $attr["src"];
1170                                 }
1171                         }
1172                 }
1173
1174                 if (sizeof($avatar)) {
1175                         ksort($avatar);
1176                         $data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
1177                 }
1178
1179                 if ($dfrn) {
1180                         // Poll DFRN specific data
1181                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1182                         if ($search->length > 0) {
1183                                 foreach ($search as $link) {
1184                                         //$data["request"] = $search->item(0)->nodeValue;
1185                                         $attr = [];
1186                                         foreach ($link->attributes as $attribute) {
1187                                                 $attr[$attribute->name] = trim($attribute->value);
1188                                         }
1189
1190                                         $data[substr($attr["rel"], 5)] = $attr["href"];
1191                                 }
1192                         }
1193
1194                         // Older Friendica versions had used the "uid" field differently than newer versions
1195                         if (!empty($data["nick"]) && !empty($data["guid"]) && ($data["nick"] == $data["guid"])) {
1196                                 unset($data["guid"]);
1197                         }
1198                 }
1199
1200
1201                 return $data;
1202         }
1203
1204         /**
1205          * @brief Check for Diaspora contact
1206          *
1207          * @param array $webfinger Webfinger data
1208          *
1209          * @return array Diaspora data
1210          * @throws HTTPException\InternalServerErrorException
1211          */
1212         private static function diaspora($webfinger)
1213         {
1214                 $hcard_url = "";
1215                 $data = [];
1216                 // The array is reversed to take into account the order of preference for same-rel links
1217                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1218                 foreach (array_reverse($webfinger["links"]) as $link) {
1219                         if (($link["rel"] == "http://microformats.org/profile/hcard") && !empty($link["href"])) {
1220                                 $hcard_url = $link["href"];
1221                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && !empty($link["href"])) {
1222                                 $data["baseurl"] = trim($link["href"], '/');
1223                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && !empty($link["href"])) {
1224                                 $data["guid"] = $link["href"];
1225                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && (defaults($link, "type", "") == "text/html") && !empty($link["href"])) {
1226                                 $data["url"] = $link["href"];
1227                         } elseif (($link["rel"] == NAMESPACE_FEED) && !empty($link["href"])) {
1228                                 $data["poll"] = $link["href"];
1229                         } elseif (($link["rel"] == NAMESPACE_POCO) && !empty($link["href"])) {
1230                                 $data["poco"] = $link["href"];
1231                         } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1232                                 $data["notify"] = $link["href"];
1233                         } elseif (($link["rel"] == "diaspora-public-key") && !empty($link["href"])) {
1234                                 $data["pubkey"] = base64_decode($link["href"]);
1235
1236                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1237                                 if (strstr($data["pubkey"], 'RSA ')) {
1238                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1239                                 }
1240                         }
1241                 }
1242
1243                 if (!isset($data["url"]) || ($hcard_url == "")) {
1244                         return false;
1245                 }
1246
1247                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1248                         foreach ($webfinger["aliases"] as $alias) {
1249                                 if (Strings::normaliseLink($alias) != Strings::normaliseLink($data["url"]) && ! strstr($alias, "@")) {
1250                                         $data["alias"] = $alias;
1251                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1252                                         $data["addr"] = substr($alias, 5);
1253                                 }
1254                         }
1255                 }
1256
1257                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
1258                         $data["addr"] = substr($webfinger["subject"], 5);
1259                 }
1260
1261                 // Fetch further information from the hcard
1262                 $data = self::pollHcard($hcard_url, $data);
1263
1264                 if (!$data) {
1265                         return false;
1266                 }
1267
1268                 if (isset($data["url"])
1269                         && isset($data["guid"])
1270                         && isset($data["baseurl"])
1271                         && isset($data["pubkey"])
1272                         && ($hcard_url != "")
1273                 ) {
1274                         $data["network"] = Protocol::DIASPORA;
1275
1276                         // The Diaspora handle must always be lowercase
1277                         if (!empty($data["addr"])) {
1278                                 $data["addr"] = strtolower($data["addr"]);
1279                         }
1280
1281                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1282                         $data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
1283                         $data["batch"]  = $data["baseurl"] . "/receive/public";
1284                 } else {
1285                         return false;
1286                 }
1287
1288                 return $data;
1289         }
1290
1291         /**
1292          * @brief Check for OStatus contact
1293          *
1294          * @param array $webfinger Webfinger data
1295          * @param bool  $short     Short detection mode
1296          *
1297          * @return array|bool OStatus data or "false" on error or "true" on short mode
1298          * @throws HTTPException\InternalServerErrorException
1299          */
1300         private static function ostatus($webfinger, $short = false)
1301         {
1302                 $data = [];
1303
1304                 if (!empty($webfinger["aliases"]) && is_array($webfinger["aliases"])) {
1305                         foreach ($webfinger["aliases"] as $alias) {
1306                                 if (strstr($alias, "@") && !strstr(Strings::normaliseLink($alias), "http://")) {
1307                                         $data["addr"] = str_replace('acct:', '', $alias);
1308                                 }
1309                         }
1310                 }
1311
1312                 if (!empty($webfinger["subject"]) && strstr($webfinger["subject"], "@")
1313                         && !strstr(Strings::normaliseLink($webfinger["subject"]), "http://")
1314                 ) {
1315                         $data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
1316                 }
1317
1318                 if (is_array($webfinger["links"])) {
1319                         // The array is reversed to take into account the order of preference for same-rel links
1320                         // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1321                         foreach (array_reverse($webfinger["links"]) as $link) {
1322                                 if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1323                                         && (defaults($link, "type", "") == "text/html")
1324                                         && ($link["href"] != "")
1325                                 ) {
1326                                         $data["url"] = $link["href"];
1327                                 } elseif (($link["rel"] == "salmon") && !empty($link["href"])) {
1328                                         $data["notify"] = $link["href"];
1329                                 } elseif (($link["rel"] == NAMESPACE_FEED) && !empty($link["href"])) {
1330                                         $data["poll"] = $link["href"];
1331                                 } elseif (($link["rel"] == "magic-public-key") && !empty($link["href"])) {
1332                                         $pubkey = $link["href"];
1333
1334                                         if (substr($pubkey, 0, 5) === 'data:') {
1335                                                 if (strstr($pubkey, ',')) {
1336                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1337                                                 } else {
1338                                                         $pubkey = substr($pubkey, 5);
1339                                                 }
1340                                         } elseif (Strings::normaliseLink($pubkey) == 'http://') {
1341                                                 $curlResult = Network::curl($pubkey);
1342                                                 if ($curlResult->isTimeout()) {
1343                                                         self::$istimeout = true;
1344                                                         return false;
1345                                                 }
1346                                                 $pubkey = $curlResult->getBody();
1347                                         }
1348
1349                                         $key = explode(".", $pubkey);
1350
1351                                         if (sizeof($key) >= 3) {
1352                                                 $m = Strings::base64UrlDecode($key[1]);
1353                                                 $e = Strings::base64UrlDecode($key[2]);
1354                                                 $data["pubkey"] = Crypto::meToPem($m, $e);
1355                                         }
1356                                 }
1357                         }
1358                 }
1359
1360                 if (isset($data["notify"]) && isset($data["pubkey"])
1361                         && isset($data["poll"])
1362                         && isset($data["url"])
1363                 ) {
1364                         $data["network"] = Protocol::OSTATUS;
1365                 } else {
1366                         return false;
1367                 }
1368
1369                 if ($short) {
1370                         return true;
1371                 }
1372
1373                 // Fetch all additional data from the feed
1374                 $curlResult = Network::curl($data["poll"]);
1375                 if ($curlResult->isTimeout()) {
1376                         self::$istimeout = true;
1377                         return false;
1378                 }
1379                 $feed = $curlResult->getBody();
1380                 $dummy1 = null;
1381                 $dummy2 = null;
1382                 $dummy2 = null;
1383                 $feed_data = Feed::import($feed, $dummy1, $dummy2, $dummy3, true);
1384                 if (!$feed_data) {
1385                         return false;
1386                 }
1387
1388                 if (!empty($feed_data["header"]["author-name"])) {
1389                         $data["name"] = $feed_data["header"]["author-name"];
1390                 }
1391                 if (!empty($feed_data["header"]["author-nick"])) {
1392                         $data["nick"] = $feed_data["header"]["author-nick"];
1393                 }
1394                 if (!empty($feed_data["header"]["author-avatar"])) {
1395                         $data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
1396                 }
1397                 if (!empty($feed_data["header"]["author-id"])) {
1398                         $data["alias"] = $feed_data["header"]["author-id"];
1399                 }
1400                 if (!empty($feed_data["header"]["author-location"])) {
1401                         $data["location"] = $feed_data["header"]["author-location"];
1402                 }
1403                 if (!empty($feed_data["header"]["author-about"])) {
1404                         $data["about"] = $feed_data["header"]["author-about"];
1405                 }
1406                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1407                 // So we take the value that we just fetched, although the other one worked as well
1408                 if (!empty($feed_data["header"]["author-link"])) {
1409                         $data["url"] = $feed_data["header"]["author-link"];
1410                 }
1411
1412                 if (($data['poll'] == $data['url']) && ($data["alias"] != '')) {
1413                         $data['url'] = $data["alias"];
1414                         $data["alias"] = '';
1415                 }
1416
1417                 /// @todo Fetch location and "about" from the feed as well
1418                 return $data;
1419         }
1420
1421         /**
1422          * @brief Fetch data from a pump.io profile page
1423          *
1424          * @param string $profile_link Link to the profile page
1425          *
1426          * @return array profile data
1427          */
1428         private static function pumpioProfileData($profile_link)
1429         {
1430                 $doc = new DOMDocument();
1431                 if (!@$doc->loadHTMLFile($profile_link)) {
1432                         return false;
1433                 }
1434
1435                 $xpath = new DomXPath($doc);
1436
1437                 $data = [];
1438
1439                 $data["name"] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
1440
1441                 if ($data["name"] == '') {
1442                         // This is ugly - but pump.io doesn't seem to know a better way for it
1443                         $data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1444                         $pos = strpos($data["name"], chr(10));
1445                         if ($pos) {
1446                                 $data["name"] = trim(substr($data["name"], 0, $pos));
1447                         }
1448                 }
1449
1450                 $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-locality')]");
1451
1452                 if ($data["location"] == '') {
1453                         $data["location"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'location')]");
1454                 }
1455
1456                 $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'p-note')]");
1457
1458                 if ($data["about"] == '') {
1459                         $data["about"] = XML::getFirstNodeValue($xpath, "//p[contains(@class, 'summary')]");
1460                 }
1461
1462                 $avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
1463                 if (!$avatar) {
1464                         $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1465                 }
1466                 if ($avatar) {
1467                         foreach ($avatar->attributes as $attribute) {
1468                                 if ($attribute->name == "src") {
1469                                         $data["photo"] = trim($attribute->value);
1470                                 }
1471                         }
1472                 }
1473
1474                 return $data;
1475         }
1476
1477         /**
1478          * @brief Check for pump.io contact
1479          *
1480          * @param array $webfinger Webfinger data
1481          *
1482          * @param       $addr
1483          * @return array pump.io data
1484          */
1485         private static function pumpio($webfinger, $addr)
1486         {
1487                 $data = [];
1488                 // The array is reversed to take into account the order of preference for same-rel links
1489                 // See: https://tools.ietf.org/html/rfc7033#section-4.4.4
1490                 foreach (array_reverse($webfinger["links"]) as $link) {
1491                         if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1492                                 && (defaults($link, "type", "") == "text/html")
1493                                 && ($link["href"] != "")
1494                         ) {
1495                                 $data["url"] = $link["href"];
1496                         } elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
1497                                 $data["notify"] = $link["href"];
1498                         } elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
1499                                 $data["poll"] = $link["href"];
1500                         } elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
1501                                 $data["dialback"] = $link["href"];
1502                         }
1503                 }
1504                 if (isset($data["poll"]) && isset($data["notify"])
1505                         && isset($data["dialback"])
1506                         && isset($data["url"])
1507                 ) {
1508                         // by now we use these fields only for the network type detection
1509                         // So we unset all data that isn't used at the moment
1510                         unset($data["dialback"]);
1511
1512                         $data["network"] = Protocol::PUMPIO;
1513                 } else {
1514                         return false;
1515                 }
1516
1517                 $profile_data = self::pumpioProfileData($data["url"]);
1518
1519                 if (!$profile_data) {
1520                         return false;
1521                 }
1522
1523                 $data = array_merge($data, $profile_data);
1524
1525                 if (($addr != '') && ($data['name'] != '')) {
1526                         $name = trim(str_replace($addr, '', $data['name']));
1527                         if ($name != '') {
1528                                 $data['name'] = $name;
1529                         }
1530                 }
1531
1532                 return $data;
1533         }
1534
1535         /**
1536          * @brief Check page for feed link
1537          *
1538          * @param string $url Page link
1539          *
1540          * @return string feed link
1541          */
1542         private static function getFeedLink($url)
1543         {
1544                 $doc = new DOMDocument();
1545
1546                 if (!@$doc->loadHTMLFile($url)) {
1547                         return false;
1548                 }
1549
1550                 $xpath = new DomXPath($doc);
1551
1552                 //$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
1553                 $feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
1554                 if (!is_object($feeds)) {
1555                         return false;
1556                 }
1557
1558                 if ($feeds->length == 0) {
1559                         return false;
1560                 }
1561
1562                 $feed_url = "";
1563
1564                 foreach ($feeds as $feed) {
1565                         $attr = [];
1566                         foreach ($feed->attributes as $attribute) {
1567                                 $attr[$attribute->name] = trim($attribute->value);
1568                         }
1569
1570                         if ($feed_url == "") {
1571                                 $feed_url = $attr["href"];
1572                         }
1573                 }
1574
1575                 return $feed_url;
1576         }
1577
1578         /**
1579          * @brief Check for feed contact
1580          *
1581          * @param string  $url   Profile link
1582          * @param boolean $probe Do a probe if the page contains a feed link
1583          *
1584          * @return array feed data
1585          * @throws HTTPException\InternalServerErrorException
1586          */
1587         private static function feed($url, $probe = true)
1588         {
1589                 $curlResult = Network::curl($url);
1590                 if ($curlResult->isTimeout()) {
1591                         self::$istimeout = true;
1592                         return false;
1593                 }
1594                 $feed = $curlResult->getBody();
1595                 $dummy1 = $dummy2 = $dummy3 = null;
1596                 $feed_data = Feed::import($feed, $dummy1, $dummy2, $dummy3, true);
1597
1598                 if (!$feed_data) {
1599                         if (!$probe) {
1600                                 return false;
1601                         }
1602
1603                         $feed_url = self::getFeedLink($url);
1604
1605                         if (!$feed_url) {
1606                                 return false;
1607                         }
1608
1609                         return self::feed($feed_url, false);
1610                 }
1611
1612                 if (!empty($feed_data["header"]["author-name"])) {
1613                         $data["name"] = $feed_data["header"]["author-name"];
1614                 }
1615
1616                 if (!empty($feed_data["header"]["author-nick"])) {
1617                         $data["nick"] = $feed_data["header"]["author-nick"];
1618                 }
1619
1620                 if (!empty($feed_data["header"]["author-avatar"])) {
1621                         $data["photo"] = $feed_data["header"]["author-avatar"];
1622                 }
1623
1624                 if (!empty($feed_data["header"]["author-id"])) {
1625                         $data["alias"] = $feed_data["header"]["author-id"];
1626                 }
1627
1628                 $data["url"] = $url;
1629                 $data["poll"] = $url;
1630
1631                 if (!empty($feed_data["header"]["author-link"])) {
1632                         $data["baseurl"] = $feed_data["header"]["author-link"];
1633                 } else {
1634                         $data["baseurl"] = $data["url"];
1635                 }
1636
1637                 $data["network"] = Protocol::FEED;
1638
1639                 return $data;
1640         }
1641
1642         /**
1643          * @brief Check for mail contact
1644          *
1645          * @param string  $uri Profile link
1646          * @param integer $uid User ID
1647          *
1648          * @return array mail data
1649          * @throws \Exception
1650          */
1651         private static function mail($uri, $uid)
1652         {
1653                 if (!Network::isEmailDomainValid($uri)) {
1654                         return false;
1655                 }
1656
1657                 if ($uid == 0) {
1658                         return false;
1659                 }
1660
1661                 $user = DBA::selectFirst('user', ['prvkey'], ['uid' => $uid]);
1662
1663                 $condition = ["`uid` = ? AND `server` != ''", $uid];
1664                 $fields = ['pass', 'user', 'server', 'port', 'ssltype', 'mailbox'];
1665                 $mailacct = DBA::selectFirst('mailacct', $fields, $condition);
1666
1667                 if (!DBA::isResult($user) || !DBA::isResult($mailacct)) {
1668                         return false;
1669                 }
1670
1671                 $mailbox = Email::constructMailboxName($mailacct);
1672                 $password = '';
1673                 openssl_private_decrypt(hex2bin($mailacct['pass']), $password, $user['prvkey']);
1674                 $mbox = Email::connect($mailbox, $mailacct['user'], $password);
1675                 if (!$mbox) {
1676                         return false;
1677                 }
1678
1679                 $msgs = Email::poll($mbox, $uri);
1680                 Logger::log('searching '.$uri.', '.count($msgs).' messages found.', Logger::DEBUG);
1681
1682                 if (!count($msgs)) {
1683                         return false;
1684                 }
1685
1686                 $phost = substr($uri, strpos($uri, '@') + 1);
1687
1688                 $data = [];
1689                 $data["addr"]    = $uri;
1690                 $data["network"] = Protocol::MAIL;
1691                 $data["name"]    = substr($uri, 0, strpos($uri, '@'));
1692                 $data["nick"]    = $data["name"];
1693                 $data["photo"]   = Network::lookupAvatarByEmail($uri);
1694                 $data["url"]     = 'mailto:'.$uri;
1695                 $data["notify"]  = 'smtp ' . Strings::getRandomHex();
1696                 $data["poll"]    = 'email ' . Strings::getRandomHex();
1697
1698                 $x = Email::messageMeta($mbox, $msgs[0]);
1699                 if (stristr($x[0]->from, $uri)) {
1700                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1701                 } elseif (stristr($x[0]->to, $uri)) {
1702                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1703                 }
1704                 if (isset($adr)) {
1705                         foreach ($adr as $feadr) {
1706                                 if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
1707                                         &&(strcasecmp($feadr->host, $phost) == 0)
1708                                         && (strlen($feadr->personal))
1709                                 ) {
1710                                         $personal = imap_mime_header_decode($feadr->personal);
1711                                         $data["name"] = "";
1712                                         foreach ($personal as $perspart) {
1713                                                 if ($perspart->charset != "default") {
1714                                                         $data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1715                                                 } else {
1716                                                         $data["name"] .= $perspart->text;
1717                                                 }
1718                                         }
1719
1720                                         $data["name"] = Strings::escapeTags($data["name"]);
1721                                 }
1722                         }
1723                 }
1724                 if (!empty($mbox)) {
1725                         imap_close($mbox);
1726                 }
1727                 return $data;
1728         }
1729
1730         /**
1731          * @brief Mix two paths together to possibly fix missing parts
1732          *
1733          * @param string $avatar Path to the avatar
1734          * @param string $base   Another path that is hopefully complete
1735          *
1736          * @return string fixed avatar path
1737          * @throws \Exception
1738          */
1739         public static function fixAvatar($avatar, $base)
1740         {
1741                 $base_parts = parse_url($base);
1742
1743                 // Remove all parts that could create a problem
1744                 unset($base_parts['path']);
1745                 unset($base_parts['query']);
1746                 unset($base_parts['fragment']);
1747
1748                 $avatar_parts = parse_url($avatar);
1749
1750                 // Now we mix them
1751                 $parts = array_merge($base_parts, $avatar_parts);
1752
1753                 // And put them together again
1754                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
1755                 $host     = isset($parts['host'])     ? $parts['host']           : '';
1756                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
1757                 $path     = isset($parts['path'])     ? $parts['path']           : '';
1758                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
1759                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
1760
1761                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
1762
1763                 Logger::log('Base: '.$base.' - Avatar: '.$avatar.' - Fixed: '.$fixed, Logger::DATA);
1764
1765                 return $fixed;
1766         }
1767 }