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