src/Network/Probe.php

   1 <?php
   2
   3 namespace Friendica\Network;
   4
   5 /**
   6  * @file src/Network/Probe.php
   7  * @brief Functions for probing URL
   8  *
   9  */
  10
  11 use Friendica\App;
  12 use Friendica\Core\System;
  13 use Friendica\Core\Config;
  14 use Friendica\Database\Dbm;
  15
  16 use dba;
  17 use Cache;
  18 use xml;
  19
  20 use DomXPath;
  21 use DOMDocument;
  22
  23 require_once 'include/feed.php';
  24 require_once 'include/email.php';
  25 require_once 'include/network.php';
  26
  27 /**
  28  * @brief This class contain functions for probing URL
  29  *
  30  */
  31 class Probe {
  32
  33         private static $baseurl;
  34
  35         /**
  36          * @brief Rearrange the array so that it always has the same order
  37          *
  38          * @param array $data Unordered data
  39          *
  40          * @return array Ordered data
  41          */
  42         private static function rearrangeData($data) {
  43                 $fields = array("name", "nick", "guid", "url", "addr", "alias",
  44                                 "photo", "community", "keywords", "location", "about",
  45                                 "batch", "notify", "poll", "request", "confirm", "poco",
  46                                 "priority", "network", "pubkey", "baseurl");
  47
  48                 $newdata = array();
  49                 foreach ($fields as $field) {
  50                         if (isset($data[$field])) {
  51                                 $newdata[$field] = $data[$field];
  52                         } else {
  53                                 $newdata[$field] = "";
  54                         }
  55                 }
  56
  57                 // We don't use the "priority" field anymore and replace it with a dummy.
  58                 $newdata["priority"] = 0;
  59
  60                 return $newdata;
  61         }
  62
  63         /**
  64          * @brief Check if the hostname belongs to the own server
  65          *
  66          * @param string $host The hostname that is to be checked
  67          *
  68          * @return bool Does the testes hostname belongs to the own server?
  69          */
  70         private static function ownHost($host) {
  71                 $own_host = get_app()->get_hostname();
  72
  73                 $parts = parse_url($host);
  74
  75                 if (!isset($parts['scheme'])) {
  76                         $parts = parse_url('http://'.$host);
  77                 }
  78
  79                 if (!isset($parts['host'])) {
  80                         return false;
  81                 }
  82                 return $parts['host'] == $own_host;
  83         }
  84
  85         /**
  86          * @brief Probes for webfinger path via "host-meta"
  87          *
  88          * @param string $host The host part of an url
  89          *
  90          * @return array with template and type of the webfinger template for JSON or XML
  91          */
  92         private static function hostMeta($host) {
  93
  94                 // Reset the static variable
  95                 self::$baseurl = '';
  96
  97                 $ssl_url = "https://".$host."/.well-known/host-meta";
  98                 $url = "http://".$host."/.well-known/host-meta";
  99
 100                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 101                 $redirects = 0;
 102
 103                 logger("Probing for ".$host, LOGGER_DEBUG);
 104
 105                 $ret = z_fetch_url($ssl_url, false, $redirects, array('timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml'));
 106                 if ($ret['success']) {
 107                         $xml = $ret['body'];
 108                         $xrd = parse_xml_string($xml, false);
 109                         $host_url = 'https://'.$host;
 110                 }
 111
 112                 if (!is_object($xrd)) {
 113                         $ret = z_fetch_url($url, false, $redirects, array('timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml'));
 114                         if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 115                                 logger("Probing timeout for ".$url, LOGGER_DEBUG);
 116                                 return false;
 117                         }
 118                         $xml = $ret['body'];
 119                         $xrd = parse_xml_string($xml, false);
 120                         $host_url = 'http://'.$host;
 121                 }
 122                 if (!is_object($xrd)) {
 123                         logger("No xrd object found for ".$host, LOGGER_DEBUG);
 124                         return array();
 125                 }
 126
 127                 $links = xml::element_to_array($xrd);
 128                 if (!isset($links["xrd"]["link"])) {
 129                         logger("No xrd data found for ".$host, LOGGER_DEBUG);
 130                         return array();
 131                 }
 132
 133                 $lrdd = array();
 134                 // The following webfinger path is defined in RFC 7033 https://tools.ietf.org/html/rfc7033
 135                 // Problem is that Hubzilla currently doesn't provide all data in the JSON webfinger
 136                 // compared to the XML webfinger. So this is commented out by now.
 137                 // $lrdd = array("application/jrd+json" => $host_url.'/.well-known/webfinger?resource={uri}');
 138
 139                 foreach ($links["xrd"]["link"] as $value => $link) {
 140                         if (!empty($link["@attributes"])) {
 141                                 $attributes = $link["@attributes"];
 142                         } elseif ($value == "@attributes") {
 143                                 $attributes = $link;
 144                         } else {
 145                                 continue;
 146                         }
 147
 148                         if (($attributes["rel"] == "lrdd") && !empty($attributes["template"])) {
 149                                 $type = (empty($attributes["type"]) ? '' : $attributes["type"]);
 150
 151                                 $lrdd[$type] = $attributes["template"];
 152                         }
 153                 }
 154
 155                 self::$baseurl = "http://".$host;
 156
 157                 logger("Probing successful for ".$host, LOGGER_DEBUG);
 158
 159                 return $lrdd;
 160         }
 161
 162         /**
 163          * @brief Perform Webfinger lookup and return DFRN data
 164          *
 165          * Given an email style address, perform webfinger lookup and
 166          * return the resulting DFRN profile URL, or if no DFRN profile URL
 167          * is located, returns an OStatus subscription template (prefixed
 168          * with the string 'stat:' to identify it as on OStatus template).
 169          * If this isn't an email style address just return $webbie.
 170          * Return an empty string if email-style addresses but webfinger fails,
 171          * or if the resultant personal XRD doesn't contain a supported
 172          * subscription/friend-request attribute.
 173          *
 174          * amended 7/9/2011 to return an hcard which could save potentially loading
 175          * a lengthy content page to scrape dfrn attributes
 176          *
 177          * @param string $webbie Address that should be probed
 178          * @param string $hcard_url Link to the hcard - is returned by reference
 179          *
 180          * @return string profile link
 181          */
 182         public static function webfingerDfrn($webbie, &$hcard_url) {
 183
 184                 $profile_link = '';
 185
 186                 $links = self::lrdd($webbie);
 187                 logger('webfingerDfrn: '.$webbie.':'.print_r($links, true), LOGGER_DATA);
 188                 if (count($links)) {
 189                         foreach ($links as $link) {
 190                                 if ($link['@attributes']['rel'] === NAMESPACE_DFRN) {
 191                                         $profile_link = $link['@attributes']['href'];
 192                                 }
 193                                 if (($link['@attributes']['rel'] === NAMESPACE_OSTATUSSUB) && ($profile_link == "")) {
 194                                         $profile_link = 'stat:'.$link['@attributes']['template'];
 195                                 }
 196                                 if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
 197                                         $hcard_url = $link['@attributes']['href'];
 198                                 }
 199                         }
 200                 }
 201                 return $profile_link;
 202         }
 203
 204         /**
 205          * @brief Check an URI for LRDD data
 206          *
 207          * this is a replacement for the "lrdd" function in include/network.php.
 208          * It isn't used in this class and has some redundancies in the code.
 209          * When time comes we can check the existing calls for "lrdd" if we can rework them.
 210          *
 211          * @param string $uri Address that should be probed
 212          *
 213          * @return array uri data
 214          */
 215         public static function lrdd($uri) {
 216
 217                 $lrdd = self::hostMeta($uri);
 218                 $webfinger = null;
 219
 220                 if (is_bool($lrdd)) {
 221                         return array();
 222                 }
 223
 224                 if (!$lrdd) {
 225                         $parts = @parse_url($uri);
 226                         if (!$parts) {
 227                                 return array();
 228                         }
 229
 230                         $host = $parts["host"];
 231                         if (!empty($parts["port"])) {
 232                                 $host .= ':'.$parts["port"];
 233                         }
 234
 235                         $path_parts = explode("/", trim($parts["path"], "/"));
 236
 237                         $nick = array_pop($path_parts);
 238
 239                         do {
 240                                 $lrdd = self::hostMeta($host);
 241                                 $host .= "/".array_shift($path_parts);
 242                         } while (!$lrdd && (sizeof($path_parts) > 0));
 243                 }
 244
 245                 if (!$lrdd) {
 246                         logger("No lrdd data found for ".$uri, LOGGER_DEBUG);
 247                         return array();
 248                 }
 249
 250                 foreach ($lrdd AS $type => $template) {
 251                         if ($webfinger) {
 252                                 continue;
 253                         }
 254
 255                         $path = str_replace('{uri}', urlencode($uri), $template);
 256                         $webfinger = self::webfinger($path, $type);
 257
 258                         if (!$webfinger && (strstr($uri, "@"))) {
 259                                 $path = str_replace('{uri}', urlencode("acct:".$uri), $template);
 260                                 $webfinger = self::webfinger($path, $type);
 261                         }
 262
 263                         // Special treatment for Mastodon
 264                         // Problem is that Mastodon uses an URL format like http://domain.tld/@nick
 265                         // But the webfinger for this format fails.
 266                         if (!$webfinger && !empty($nick)) {
 267                                 // Mastodon uses a "@" as prefix for usernames in their url format
 268                                 $nick = ltrim($nick, '@');
 269
 270                                 $addr = $nick."@".$host;
 271
 272                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 273                                 $webfinger = self::webfinger($path, $type);
 274                         }
 275                 }
 276
 277                 if (!is_array($webfinger["links"])) {
 278                         logger("No webfinger links found for ".$uri, LOGGER_DEBUG);
 279                         return false;
 280                 }
 281
 282                 $data = array();
 283
 284                 foreach ($webfinger["links"] as $link) {
 285                         $data[] = array("@attributes" => $link);
 286                 }
 287
 288                 if (is_array($webfinger["aliases"])) {
 289                         foreach ($webfinger["aliases"] as $alias) {
 290                                 $data[] = array("@attributes" =>
 291                                                         array("rel" => "alias",
 292                                                                 "href" => $alias));
 293                         }
 294                 }
 295
 296                 return $data;
 297         }
 298
 299         /**
 300          * @brief Fetch information (protocol endpoints and user information) about a given uri
 301          *
 302          * @param string $uri Address that should be probed
 303          * @param string $network Test for this specific network
 304          * @param integer $uid User ID for the probe (only used for mails)
 305          * @param boolean $cache Use cached values?
 306          *
 307          * @return array uri data
 308          */
 309         public static function uri($uri, $network = "", $uid = -1, $cache = true) {
 310
 311                 if ($cache) {
 312                         $result = Cache::get("Probe::uri:".$network.":".$uri);
 313                         if (!is_null($result)) {
 314                                 return $result;
 315                         }
 316                 }
 317
 318                 if ($uid == -1) {
 319                         $uid = local_user();
 320                 }
 321
 322                 $data = self::detect($uri, $network, $uid);
 323
 324                 if (!isset($data["url"])) {
 325                         $data["url"] = $uri;
 326                 }
 327
 328                 if ($data["photo"] != "") {
 329                         $data["baseurl"] = matching_url(normalise_link($data["baseurl"]), normalise_link($data["photo"]));
 330                 } else {
 331                         $data["photo"] = System::baseUrl().'/images/person-175.jpg';
 332                 }
 333
 334                 if (empty($data["name"])) {
 335                         if (!empty($data["nick"])) {
 336                                 $data["name"] = $data["nick"];
 337                         }
 338
 339                         if ($data["name"] == "") {
 340                                 $data["name"] = $data["url"];
 341                         }
 342                 }
 343
 344                 if (empty($data["nick"])) {
 345                         $data["nick"] = strtolower($data["name"]);
 346
 347                         if (strpos($data['nick'], ' ')) {
 348                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 349                         }
 350                 }
 351
 352                 if (self::$baseurl != "") {
 353                         $data["baseurl"] = self::$baseurl;
 354                 }
 355
 356                 if (!isset($data["network"])) {
 357                         $data["network"] = NETWORK_PHANTOM;
 358                 }
 359
 360                 $data = self::rearrangeData($data);
 361
 362                 // Only store into the cache if the value seems to be valid
 363                 if (!in_array($data['network'], array(NETWORK_PHANTOM, NETWORK_MAIL))) {
 364                         Cache::set("Probe::uri:".$network.":".$uri, $data, CACHE_DAY);
 365
 366                         /// @todo temporary fix - we need a real contact update function that updates only changing fields
 367                         /// The biggest problem is the avatar picture that could have a reduced image size.
 368                         /// It should only be updated if the existing picture isn't existing anymore.
 369                         /// We only update the contact when it is no probing for a specific network.
 370                         if (($data['network'] != NETWORK_FEED)
 371                                 && ($network == "")
 372                                 && $data["name"]
 373                                 && $data["nick"]
 374                                 && $data["url"]
 375                                 && $data["addr"]
 376                                 && $data["poll"]
 377                         ) {
 378                                 $fields = array('name' => $data['name'],
 379                                                 'nick' => $data['nick'],
 380                                                 'url' => $data['url'],
 381                                                 'addr' => $data['addr'],
 382                                                 'photo' => $data['photo'],
 383                                                 'keywords' => $data['keywords'],
 384                                                 'location' => $data['location'],
 385                                                 'about' => $data['about'],
 386                                                 'notify' => $data['notify'],
 387                                                 'network' => $data['network'],
 388                                                 'server_url' => $data['baseurl']);
 389
 390                                 $fieldnames = array();
 391
 392                                 foreach ($fields AS $key => $val) {
 393                                         if (empty($val)) {
 394                                                 unset($fields[$key]);
 395                                         } else {
 396                                                 $fieldnames[] = $key;
 397                                         }
 398                                 }
 399
 400                                 $fields['updated'] = Dbm::date();
 401
 402                                 $condition = array('nurl' => normalise_link($data["url"]));
 403
 404                                 $old_fields = dba::select('gcontact', $fieldnames, $condition, array('limit' => 1));
 405
 406                                 dba::update('gcontact', $fields, $condition, $old_fields);
 407
 408                                 $fields = array('name' => $data['name'],
 409                                                 'nick' => $data['nick'],
 410                                                 'url' => $data['url'],
 411                                                 'addr' => $data['addr'],
 412                                                 'alias' => $data['alias'],
 413                                                 'keywords' => $data['keywords'],
 414                                                 'location' => $data['location'],
 415                                                 'about' => $data['about'],
 416                                                 'batch' => $data['batch'],
 417                                                 'notify' => $data['notify'],
 418                                                 'poll' => $data['poll'],
 419                                                 'request' => $data['request'],
 420                                                 'confirm' => $data['confirm'],
 421                                                 'poco' => $data['poco'],
 422                                                 'network' => $data['network'],
 423                                                 'success_update' => Dbm::date());
 424
 425                                 $fieldnames = array();
 426
 427                                 foreach ($fields AS $key => $val) {
 428                                         if (empty($val)) {
 429                                                 unset($fields[$key]);
 430                                         } else {
 431                                                 $fieldnames[] = $key;
 432                                         }
 433                                 }
 434
 435                                 $condition = array('nurl' => normalise_link($data["url"]), 'self' => false, 'uid' => 0);
 436
 437                                 $old_fields = dba::select('contact', $fieldnames, $condition, array('limit' => 1));
 438
 439                                 dba::update('contact', $fields, $condition, $old_fields);
 440                         }
 441                 }
 442
 443                 return $data;
 444         }
 445
 446         /**
 447          * @brief Switch the scheme of an url between http and https
 448          *
 449          * @param string $url URL
 450          *
 451          * @return string switched URL
 452          */
 453         private static function switchScheme($url) {
 454                 $parts = parse_url($url);
 455
 456                 if (!isset($parts['scheme'])) {
 457                         return $url;
 458                 }
 459
 460                 if ($parts['scheme'] == 'http') {
 461                         $url = str_replace('http://', 'https://', $url);
 462                 } elseif ($parts['scheme'] == 'https') {
 463                         $url = str_replace('https://', 'http://', $url);
 464                 }
 465
 466                 return $url;
 467         }
 468
 469         /**
 470          * @brief Checks if a profile url should be OStatus but only provides partial information
 471          *
 472          * @param array $webfinger Webfinger data
 473          * @param string $lrdd Path template for webfinger request
 474          *
 475          * @return array fixed webfinger data
 476          */
 477         private static function fixOstatus($webfinger, $lrdd, $type) {
 478                 if (empty($webfinger['links']) || empty($webfinger['subject'])) {
 479                         return $webfinger;
 480                 }
 481
 482                 $is_ostatus = false;
 483                 $has_key = false;
 484
 485                 foreach ($webfinger['links'] as $link) {
 486                         if ($link['rel'] == NAMESPACE_OSTATUSSUB) {
 487                                 $is_ostatus = true;
 488                         }
 489                         if ($link['rel'] == 'magic-public-key') {
 490                                 $has_key = true;
 491                         }
 492                 }
 493
 494                 if (!$is_ostatus || $has_key) {
 495                         return $webfinger;
 496                 }
 497
 498                 $url = self::switchScheme($webfinger['subject']);
 499                 $path = str_replace('{uri}', urlencode($url), $lrdd);
 500                 $webfinger2 = self::webfinger($path, $type);
 501
 502                 // Is the new webfinger detectable as OStatus?
 503                 if (self::ostatus($webfinger2, true)) {
 504                         $webfinger = $webfinger2;
 505                 }
 506
 507                 return $webfinger;
 508         }
 509
 510         /**
 511          * @brief Fetch information (protocol endpoints and user information) about a given uri
 512          *
 513          * This function is only called by the "uri" function that adds caching and rearranging of data.
 514          *
 515          * @param string $uri Address that should be probed
 516          * @param string $network Test for this specific network
 517          * @param integer $uid User ID for the probe (only used for mails)
 518          *
 519          * @return array uri data
 520          */
 521         private static function detect($uri, $network, $uid) {
 522                 $parts = parse_url($uri);
 523
 524                 if (!empty($parts["scheme"]) && !empty($parts["host"]) && !empty($parts["path"])) {
 525                         $host = $parts["host"];
 526                         if (!empty($parts["port"])) {
 527                                 $host .= ':'.$parts["port"];
 528                         }
 529
 530                         if ($host == 'twitter.com') {
 531                                 return array("network" => NETWORK_TWITTER);
 532                         }
 533                         $lrdd = self::hostMeta($host);
 534
 535                         if (is_bool($lrdd)) {
 536                                 return array();
 537                         }
 538
 539                         $path_parts = explode("/", trim($parts["path"], "/"));
 540
 541                         while (!$lrdd && (sizeof($path_parts) > 1)) {
 542                                 $host .= "/".array_shift($path_parts);
 543                                 $lrdd = self::hostMeta($host);
 544                         }
 545                         if (!$lrdd) {
 546                                 logger('No XRD data was found for '.$uri, LOGGER_DEBUG);
 547                                 return self::feed($uri);
 548                         }
 549                         $nick = array_pop($path_parts);
 550
 551                         // Mastodon uses a "@" as prefix for usernames in their url format
 552                         $nick = ltrim($nick, '@');
 553
 554                         $addr = $nick."@".$host;
 555
 556                 } elseif (strstr($uri, '@')) {
 557                         // If the URI starts with "mailto:" then jump directly to the mail detection
 558                         if (strpos($uri, 'mailto:') !== false) {
 559                                 $uri = str_replace('mailto:', '', $uri);
 560                                 return self::mail($uri, $uid);
 561                         }
 562
 563                         if ($network == NETWORK_MAIL) {
 564                                 return self::mail($uri, $uid);
 565                         }
 566                         // Remove "acct:" from the URI
 567                         $uri = str_replace('acct:', '', $uri);
 568
 569                         $host = substr($uri, strpos($uri, '@') + 1);
 570                         $nick = substr($uri, 0, strpos($uri, '@'));
 571
 572                         if (strpos($uri, '@twitter.com')) {
 573                                 return array("network" => NETWORK_TWITTER);
 574                         }
 575                         $lrdd = self::hostMeta($host);
 576
 577                         if (is_bool($lrdd)) {
 578                                 return array();
 579                         }
 580
 581                         if (!$lrdd) {
 582                                 logger('No XRD data was found for '.$uri, LOGGER_DEBUG);
 583                                 return self::mail($uri, $uid);
 584                         }
 585                         $addr = $uri;
 586
 587                 } else {
 588                         logger("Uri ".$uri." was not detectable", LOGGER_DEBUG);
 589                         return false;
 590                 }
 591
 592                 $webfinger = false;
 593
 594                 /// @todo Do we need the prefix "acct:" or "acct://"?
 595
 596                 foreach ($lrdd AS $type => $template) {
 597                         if ($webfinger) {
 598                                 continue;
 599                         }
 600
 601                         // At first try it with the given uri
 602                         $path = str_replace('{uri}', urlencode($uri), $template);
 603                         $webfinger = self::webfinger($path, $type);
 604
 605                         // Fix possible problems with GNU Social probing to wrong scheme
 606                         $webfinger = self::fixOstatus($webfinger, $template, $type);
 607
 608                         // We cannot be sure that the detected address was correct, so we don't use the values
 609                         if ($webfinger && ($uri != $addr)) {
 610                                 $nick = "";
 611                                 $addr = "";
 612                         }
 613
 614                         // Try webfinger with the address (user@domain.tld)
 615                         if (!$webfinger) {
 616                                 $path = str_replace('{uri}', urlencode($addr), $template);
 617                                 $webfinger = self::webfinger($path, $type);
 618                         }
 619
 620                         // Mastodon needs to have it with "acct:"
 621                         if (!$webfinger) {
 622                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 623                                 $webfinger = self::webfinger($path, $type);
 624                         }
 625                 }
 626
 627                 if (!$webfinger) {
 628                         return self::feed($uri);
 629                 }
 630
 631                 $result = false;
 632
 633                 logger("Probing ".$uri, LOGGER_DEBUG);
 634
 635                 if (in_array($network, array("", NETWORK_DFRN))) {
 636                         $result = self::dfrn($webfinger);
 637                 }
 638                 if ((!$result && ($network == "")) || ($network == NETWORK_DIASPORA)) {
 639                         $result = self::diaspora($webfinger);
 640                 }
 641                 if ((!$result && ($network == "")) || ($network == NETWORK_OSTATUS)) {
 642                         $result = self::ostatus($webfinger);
 643                 }
 644                 if ((!$result && ($network == "")) || ($network == NETWORK_PUMPIO)) {
 645                         $result = self::pumpio($webfinger);
 646                 }
 647                 if ((!$result && ($network == "")) || ($network == NETWORK_FEED)) {
 648                         $result = self::feed($uri);
 649                 } else {
 650                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 651                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 652                         if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
 653                                 $result["nick"] = $nick;
 654                         }
 655
 656                         if (empty($result["addr"]) && ($addr != "")) {
 657                                 $result["addr"] = $addr;
 658                         }
 659                 }
 660
 661                 logger($uri." is ".$result["network"], LOGGER_DEBUG);
 662
 663                 if (empty($result["baseurl"])) {
 664                         $pos = strpos($result["url"], $host);
 665                         if ($pos) {
 666                                 $result["baseurl"] = substr($result["url"], 0, $pos).$host;
 667                         }
 668                 }
 669
 670                 return $result;
 671         }
 672
 673         /**
 674          * @brief Perform a webfinger request.
 675          *
 676          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 677          *
 678          * @param string $url Address that should be probed
 679          *
 680          * @return array webfinger data
 681          */
 682         private static function webfinger($url, $type) {
 683
 684                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 685                 $redirects = 0;
 686
 687                 $ret = z_fetch_url($url, false, $redirects, array('timeout' => $xrd_timeout, 'accept_content' => $type));
 688                         if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 689                         return false;
 690                 }
 691                 $data = $ret['body'];
 692
 693                 $webfinger = json_decode($data, true);
 694                 if (is_array($webfinger)) {
 695                         if (!isset($webfinger["links"])) {
 696                                 logger("No json webfinger links for ".$url, LOGGER_DEBUG);
 697                                 return false;
 698                         }
 699                         return $webfinger;
 700                 }
 701
 702                 // If it is not JSON, maybe it is XML
 703                 $xrd = parse_xml_string($data, false);
 704                 if (!is_object($xrd)) {
 705                         logger("No webfinger data retrievable for ".$url, LOGGER_DEBUG);
 706                         return false;
 707                 }
 708
 709                 $xrd_arr = xml::element_to_array($xrd);
 710                 if (!isset($xrd_arr["xrd"]["link"])) {
 711                         logger("No XML webfinger links for ".$url, LOGGER_DEBUG);
 712                         return false;
 713                 }
 714
 715                 $webfinger = array();
 716
 717                 if (!empty($xrd_arr["xrd"]["subject"])) {
 718                         $webfinger["subject"] = $xrd_arr["xrd"]["subject"];
 719                 }
 720
 721                 if (!empty($xrd_arr["xrd"]["alias"])) {
 722                         $webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
 723                 }
 724
 725                 $webfinger["links"] = array();
 726
 727                 foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
 728                         if (!empty($data["@attributes"])) {
 729                                 $attributes = $data["@attributes"];
 730                         } elseif ($value == "@attributes") {
 731                                 $attributes = $data;
 732                         } else {
 733                                 continue;
 734                         }
 735
 736                         $webfinger["links"][] = $attributes;
 737                 }
 738                 return $webfinger;
 739         }
 740
 741         /**
 742          * @brief Poll the Friendica specific noscrape page.
 743          *
 744          * "noscrape" is a faster alternative to fetch the data from the hcard.
 745          * This functionality was originally created for the directory.
 746          *
 747          * @param string $noscrape_url Link to the noscrape page
 748          * @param array $data The already fetched data
 749          *
 750          * @return array noscrape data
 751          */
 752         private static function pollNoscrape($noscrape_url, $data) {
 753                 $ret = z_fetch_url($noscrape_url);
 754                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 755                         return false;
 756                 }
 757                 $content = $ret['body'];
 758                 if (!$content) {
 759                         logger("Empty body for ".$noscrape_url, LOGGER_DEBUG);
 760                         return false;
 761                 }
 762
 763                 $json = json_decode($content, true);
 764                 if (!is_array($json)) {
 765                         logger("No json data for ".$noscrape_url, LOGGER_DEBUG);
 766                         return false;
 767                 }
 768
 769                 if (!empty($json["fn"])) {
 770                         $data["name"] = $json["fn"];
 771                 }
 772
 773                 if (!empty($json["addr"])) {
 774                         $data["addr"] = $json["addr"];
 775                 }
 776
 777                 if (!empty($json["nick"])) {
 778                         $data["nick"] = $json["nick"];
 779                 }
 780
 781                 if (!empty($json["guid"])) {
 782                         $data["guid"] = $json["guid"];
 783                 }
 784
 785                 if (!empty($json["comm"])) {
 786                         $data["community"] = $json["comm"];
 787                 }
 788
 789                 if (!empty($json["tags"])) {
 790                         $keywords = implode(" ", $json["tags"]);
 791                         if ($keywords != "") {
 792                                 $data["keywords"] = $keywords;
 793                         }
 794                 }
 795
 796                 $location = formatted_location($json);
 797                 if ($location) {
 798                         $data["location"] = $location;
 799                 }
 800
 801                 if (!empty($json["about"])) {
 802                         $data["about"] = $json["about"];
 803                 }
 804
 805                 if (!empty($json["key"])) {
 806                         $data["pubkey"] = $json["key"];
 807                 }
 808
 809                 if (!empty($json["photo"])) {
 810                         $data["photo"] = $json["photo"];
 811                 }
 812
 813                 if (!empty($json["dfrn-request"])) {
 814                         $data["request"] = $json["dfrn-request"];
 815                 }
 816
 817                 if (!empty($json["dfrn-confirm"])) {
 818                         $data["confirm"] = $json["dfrn-confirm"];
 819                 }
 820
 821                 if (!empty($json["dfrn-notify"])) {
 822                         $data["notify"] = $json["dfrn-notify"];
 823                 }
 824
 825                 if (!empty($json["dfrn-poll"])) {
 826                         $data["poll"] = $json["dfrn-poll"];
 827                 }
 828
 829                 return $data;
 830         }
 831
 832         /**
 833          * @brief Check for valid DFRN data
 834          *
 835          * @param array $data DFRN data
 836          *
 837          * @return int Number of errors
 838          */
 839         public static function validDfrn($data) {
 840                 $errors = 0;
 841                 if (!isset($data['key'])) {
 842                         $errors ++;
 843                 }
 844                 if (!isset($data['dfrn-request'])) {
 845                         $errors ++;
 846                 }
 847                 if (!isset($data['dfrn-confirm'])) {
 848                         $errors ++;
 849                 }
 850                 if (!isset($data['dfrn-notify'])) {
 851                         $errors ++;
 852                 }
 853                 if (!isset($data['dfrn-poll'])) {
 854                         $errors ++;
 855                 }
 856                 return $errors;
 857         }
 858
 859         /**
 860          * @brief Fetch data from a DFRN profile page and via "noscrape"
 861          *
 862          * @param string $profile_link Link to the profile page
 863          *
 864          * @return array profile data
 865          */
 866         public static function profile($profile_link) {
 867
 868                 $data = array();
 869
 870                 logger("Check profile ".$profile_link, LOGGER_DEBUG);
 871
 872                 // Fetch data via noscrape - this is faster
 873                 $noscrape_url = str_replace(array("/hcard/", "/profile/"), "/noscrape/", $profile_link);
 874                 $data = self::pollNoscrape($noscrape_url, $data);
 875
 876                 if (!isset($data["notify"])
 877                         || !isset($data["confirm"])
 878                         || !isset($data["request"])
 879                         || !isset($data["poll"])
 880                         || !isset($data["poco"])
 881                         || !isset($data["name"])
 882                         || !isset($data["photo"])
 883                 ) {
 884                         $data = self::pollHcard($profile_link, $data, true);
 885                 }
 886
 887                 $prof_data = array();
 888                 $prof_data["addr"]         = $data["addr"];
 889                 $prof_data["nick"]         = $data["nick"];
 890                 $prof_data["dfrn-request"] = $data["request"];
 891                 $prof_data["dfrn-confirm"] = $data["confirm"];
 892                 $prof_data["dfrn-notify"]  = $data["notify"];
 893                 $prof_data["dfrn-poll"]    = $data["poll"];
 894                 $prof_data["dfrn-poco"]    = $data["poco"];
 895                 $prof_data["photo"]        = $data["photo"];
 896                 $prof_data["fn"]           = $data["name"];
 897                 $prof_data["key"]          = $data["pubkey"];
 898
 899                 logger("Result for profile ".$profile_link.": ".print_r($prof_data, true), LOGGER_DEBUG);
 900
 901                 return $prof_data;
 902         }
 903
 904         /**
 905          * @brief Check for DFRN contact
 906          *
 907          * @param array $webfinger Webfinger data
 908          *
 909          * @return array DFRN data
 910          */
 911         private static function dfrn($webfinger) {
 912                 $hcard_url = "";
 913                 $data = array();
 914                 foreach ($webfinger["links"] as $link) {
 915                         if (($link["rel"] == NAMESPACE_DFRN) && ($link["href"] != "")) {
 916                                 $data["network"] = NETWORK_DFRN;
 917                         } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
 918                                 $data["poll"] = $link["href"];
 919                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && ($link["type"] == "text/html") && ($link["href"] != "")) {
 920                                 $data["url"] = $link["href"];
 921                         } elseif (($link["rel"] == "http://microformats.org/profile/hcard") && ($link["href"] != "")) {
 922                                 $hcard_url = $link["href"];
 923                         } elseif (($link["rel"] == NAMESPACE_POCO) && ($link["href"] != "")) {
 924                                 $data["poco"] = $link["href"];
 925                         } elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && ($link["href"] != "")) {
 926                                 $data["photo"] = $link["href"];
 927                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && ($link["href"] != "")) {
 928                                 $data["baseurl"] = trim($link["href"], '/');
 929                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && ($link["href"] != "")) {
 930                                 $data["guid"] = $link["href"];
 931                         } elseif (($link["rel"] == "diaspora-public-key") && ($link["href"] != "")) {
 932                                 $data["pubkey"] = base64_decode($link["href"]);
 933
 934                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
 935                                 if (strstr($data["pubkey"], 'RSA ')) {
 936                                         $data["pubkey"] = rsatopem($data["pubkey"]);
 937                                 }
 938                         }
 939                 }
 940
 941                 if (is_array($webfinger["aliases"])) {
 942                         foreach ($webfinger["aliases"] as $alias) {
 943                                 if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
 944                                         $data["alias"] = $alias;
 945                                 } elseif (substr($alias, 0, 5) == 'acct:') {
 946                                         $data["addr"] = substr($alias, 5);
 947                                 }
 948                         }
 949                 }
 950
 951                 if (!isset($data["network"]) || ($hcard_url == "")) {
 952                         return false;
 953                 }
 954
 955                 // Fetch data via noscrape - this is faster
 956                 $noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
 957                 $data = self::pollNoscrape($noscrape_url, $data);
 958
 959                 if (isset($data["notify"])
 960                         && isset($data["confirm"])
 961                         && isset($data["request"])
 962                         && isset($data["poll"])
 963                         && isset($data["name"])
 964                         && isset($data["photo"])
 965                 ) {
 966                         return $data;
 967                 }
 968
 969                 $data = self::pollHcard($hcard_url, $data, true);
 970
 971                 return $data;
 972         }
 973
 974         /**
 975          * @brief Poll the hcard page (Diaspora and Friendica specific)
 976          *
 977          * @param string $hcard_url Link to the hcard page
 978          * @param array $data The already fetched data
 979          * @param boolean $dfrn Poll DFRN specific data
 980          *
 981          * @return array hcard data
 982          */
 983         private static function pollHcard($hcard_url, $data, $dfrn = false) {
 984                 $ret = z_fetch_url($hcard_url);
 985                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 986                         return false;
 987                 }
 988                 $content = $ret['body'];
 989                 if (!$content) {
 990                         return false;
 991                 }
 992
 993                 $doc = new DOMDocument();
 994                 if (!@$doc->loadHTML($content)) {
 995                         return false;
 996                 }
 997
 998                 $xpath = new DomXPath($doc);
 999
1000                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1001                 if (!is_object($vcards)) {
1002                         return false;
1003                 }
1004
1005                 if ($vcards->length > 0) {
1006                         $vcard = $vcards->item(0);
1007
1008                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1009                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1010                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1011                         if (($search->length > 0) && ($data["guid"] == "")) {
1012                                 $data["guid"] = $search->item(0)->nodeValue;
1013                         }
1014
1015                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1016                         if ($search->length > 0) {
1017                                 $data["nick"] = $search->item(0)->nodeValue;
1018                         }
1019
1020                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1021                         if ($search->length > 0) {
1022                                 $data["name"] = $search->item(0)->nodeValue;
1023                         }
1024
1025                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1026                         if ($search->length > 0) {
1027                                 $data["searchable"] = $search->item(0)->nodeValue;
1028                         }
1029
1030                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1031                         if ($search->length > 0) {
1032                                 $data["pubkey"] = $search->item(0)->nodeValue;
1033                                 if (strstr($data["pubkey"], 'RSA ')) {
1034                                         $data["pubkey"] = rsatopem($data["pubkey"]);
1035                                 }
1036                         }
1037
1038                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1039                         if ($search->length > 0) {
1040                                 $data["baseurl"] = trim($search->item(0)->nodeValue, "/");
1041                         }
1042                 }
1043
1044                 $avatar = array();
1045                 $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1046                 foreach ($photos as $photo) {
1047                         $attr = array();
1048                         foreach ($photo->attributes as $attribute) {
1049                                 $attr[$attribute->name] = trim($attribute->value);
1050                         }
1051
1052                         if (isset($attr["src"]) && isset($attr["width"])) {
1053                                 $avatar[$attr["width"]] = $attr["src"];
1054                         }
1055
1056                         // We don't have a width. So we just take everything that we got.
1057                         // This is a Hubzilla workaround which doesn't send a width.
1058                         if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
1059                                 $avatar[] = $attr["src"];
1060                         }
1061                 }
1062
1063                 if (sizeof($avatar)) {
1064                         ksort($avatar);
1065                         $data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
1066                 }
1067
1068                 if ($dfrn) {
1069                         // Poll DFRN specific data
1070                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1071                         if ($search->length > 0) {
1072                                 foreach ($search as $link) {
1073                                         //$data["request"] = $search->item(0)->nodeValue;
1074                                         $attr = array();
1075                                         foreach ($link->attributes as $attribute) {
1076                                                 $attr[$attribute->name] = trim($attribute->value);
1077                                         }
1078
1079                                         $data[substr($attr["rel"], 5)] = $attr["href"];
1080                                 }
1081                         }
1082
1083                         // Older Friendica versions had used the "uid" field differently than newer versions
1084                         if ($data["nick"] == $data["guid"]) {
1085                                 unset($data["guid"]);
1086                         }
1087                 }
1088
1089
1090                 return $data;
1091         }
1092
1093         /**
1094          * @brief Check for Diaspora contact
1095          *
1096          * @param array $webfinger Webfinger data
1097          *
1098          * @return array Diaspora data
1099          */
1100         private static function diaspora($webfinger) {
1101                 $hcard_url = "";
1102                 $data = array();
1103                 foreach ($webfinger["links"] as $link) {
1104                         if (($link["rel"] == "http://microformats.org/profile/hcard") && ($link["href"] != "")) {
1105                                 $hcard_url = $link["href"];
1106                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && ($link["href"] != "")) {
1107                                 $data["baseurl"] = trim($link["href"], '/');
1108                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && ($link["href"] != "")) {
1109                                 $data["guid"] = $link["href"];
1110                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && ($link["type"] == "text/html") && ($link["href"] != "")) {
1111                                 $data["url"] = $link["href"];
1112                         } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
1113                                 $data["poll"] = $link["href"];
1114                         } elseif (($link["rel"] == NAMESPACE_POCO) && ($link["href"] != "")) {
1115                                 $data["poco"] = $link["href"];
1116                         } elseif (($link["rel"] == "salmon") && ($link["href"] != "")) {
1117                                 $data["notify"] = $link["href"];
1118                         } elseif (($link["rel"] == "diaspora-public-key") && ($link["href"] != "")) {
1119                                 $data["pubkey"] = base64_decode($link["href"]);
1120
1121                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1122                                 if (strstr($data["pubkey"], 'RSA ')) {
1123                                         $data["pubkey"] = rsatopem($data["pubkey"]);
1124                                 }
1125                         }
1126                 }
1127
1128                 if (!isset($data["url"]) || ($hcard_url == "")) {
1129                         return false;
1130                 }
1131
1132                 if (is_array($webfinger["aliases"])) {
1133                         foreach ($webfinger["aliases"] as $alias) {
1134                                 if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
1135                                         $data["alias"] = $alias;
1136                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1137                                         $data["addr"] = substr($alias, 5);
1138                                 }
1139                         }
1140                 }
1141
1142                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
1143                         $data["addr"] = substr($webfinger["subject"], 5);
1144                 }
1145
1146                 // Fetch further information from the hcard
1147                 $data = self::pollHcard($hcard_url, $data);
1148
1149                 if (!$data) {
1150                         return false;
1151                 }
1152
1153                 if (isset($data["url"])
1154                         && isset($data["guid"])
1155                         && isset($data["baseurl"])
1156                         && isset($data["pubkey"])
1157                         && ($hcard_url != "")
1158                 ) {
1159                         $data["network"] = NETWORK_DIASPORA;
1160
1161                         // The Diaspora handle must always be lowercase
1162                         $data["addr"] = strtolower($data["addr"]);
1163
1164                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1165                         $data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
1166                         $data["batch"]  = $data["baseurl"] . "/receive/public";
1167                 } else {
1168                         return false;
1169                 }
1170
1171                 return $data;
1172         }
1173
1174         /**
1175          * @brief Check for OStatus contact
1176          *
1177          * @param array $webfinger Webfinger data
1178          * @param bool $short Short detection mode
1179          *
1180          * @return array|bool OStatus data or "false" on error or "true" on short mode
1181          */
1182         private static function ostatus($webfinger, $short = false) {
1183                 $data = array();
1184
1185                 if (is_array($webfinger["aliases"])) {
1186                         foreach ($webfinger["aliases"] as $alias) {
1187                                 if (strstr($alias, "@") && !strstr(normalise_link($alias), "http://")) {
1188                                         $data["addr"] = str_replace('acct:', '', $alias);
1189                                 }
1190                         }
1191                 }
1192
1193                 if (is_string($webfinger["subject"]) && strstr($webfinger["subject"], "@") &&
1194                         !strstr(normalise_link($webfinger["subject"]), "http://")) {
1195                         $data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
1196                 }
1197
1198                 $pubkey = "";
1199                 if (is_array($webfinger["links"])) {
1200                         foreach ($webfinger["links"] as $link) {
1201                                 if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1202                                         && ($link["type"] == "text/html")
1203                                         && ($link["href"] != "")
1204                                 ) {
1205                                         $data["url"] = $link["href"];
1206                                 } elseif (($link["rel"] == "salmon") && ($link["href"] != "")) {
1207                                         $data["notify"] = $link["href"];
1208                                 } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
1209                                         $data["poll"] = $link["href"];
1210                                 } elseif (($link["rel"] == "magic-public-key") && ($link["href"] != "")) {
1211                                         $pubkey = $link["href"];
1212
1213                                         if (substr($pubkey, 0, 5) === 'data:') {
1214                                                 if (strstr($pubkey, ',')) {
1215                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1216                                                 } else {
1217                                                         $pubkey = substr($pubkey, 5);
1218                                                 }
1219                                         } elseif (normalise_link($pubkey) == 'http://') {
1220                                                 $ret = z_fetch_url($pubkey);
1221                                                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1222                                                         return false;
1223                                                 }
1224                                                 $pubkey = $ret['body'];
1225                                         }
1226
1227                                         $key = explode(".", $pubkey);
1228
1229                                         if (sizeof($key) >= 3) {
1230                                                 $m = base64url_decode($key[1]);
1231                                                 $e = base64url_decode($key[2]);
1232                                                 $data["pubkey"] = metopem($m, $e);
1233                                         }
1234                                 }
1235                         }
1236                 }
1237
1238                 if (isset($data["notify"]) && isset($data["pubkey"])
1239                         && isset($data["poll"])
1240                         && isset($data["url"])
1241                 ) {
1242                         $data["network"] = NETWORK_OSTATUS;
1243                 } else {
1244                         return false;
1245                 }
1246
1247                 if ($short) {
1248                         return true;
1249                 }
1250
1251                 // Fetch all additional data from the feed
1252                 $ret = z_fetch_url($data["poll"]);
1253                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1254                         return false;
1255                 }
1256                 $feed = $ret['body'];
1257                 $feed_data = feed_import($feed, $dummy1, $dummy2, $dummy3, true);
1258                 if (!$feed_data) {
1259                         return false;
1260                 }
1261
1262                 if ($feed_data["header"]["author-name"] != "") {
1263                         $data["name"] = $feed_data["header"]["author-name"];
1264                 }
1265                 if ($feed_data["header"]["author-nick"] != "") {
1266                         $data["nick"] = $feed_data["header"]["author-nick"];
1267                 }
1268                 if ($feed_data["header"]["author-avatar"] != "") {
1269                         $data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
1270                 }
1271                 if ($feed_data["header"]["author-id"] != "") {
1272                         $data["alias"] = $feed_data["header"]["author-id"];
1273                 }
1274                 if ($feed_data["header"]["author-location"] != "") {
1275                         $data["location"] = $feed_data["header"]["author-location"];
1276                 }
1277                 if ($feed_data["header"]["author-about"] != "") {
1278                         $data["about"] = $feed_data["header"]["author-about"];
1279                 }
1280                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1281                 // So we take the value that we just fetched, although the other one worked as well
1282                 if ($feed_data["header"]["author-link"] != "") {
1283                         $data["url"] = $feed_data["header"]["author-link"];
1284                 }
1285
1286                 if (($data['poll'] == $data['url']) && ($data["alias"] != '')) {
1287                         $data['url'] = $data["alias"];
1288                         $data["alias"] = '';
1289                 }
1290
1291                 /// @todo Fetch location and "about" from the feed as well
1292                 return $data;
1293         }
1294
1295         /**
1296          * @brief Fetch data from a pump.io profile page
1297          *
1298          * @param string $profile_link Link to the profile page
1299          *
1300          * @return array profile data
1301          */
1302         private static function pumpioProfileData($profile_link) {
1303
1304                 $doc = new DOMDocument();
1305                 if (!@$doc->loadHTMLFile($profile_link)) {
1306                         return false;
1307                 }
1308
1309                 $xpath = new DomXPath($doc);
1310
1311                 $data = array();
1312
1313                 // This is ugly - but pump.io doesn't seem to know a better way for it
1314                 $data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1315                 $pos = strpos($data["name"], chr(10));
1316                 if ($pos) {
1317                         $data["name"] = trim(substr($data["name"], 0, $pos));
1318                 }
1319
1320                 $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1321                 if ($avatar) {
1322                         foreach ($avatar->attributes as $attribute) {
1323                                 if ($attribute->name == "src") {
1324                                         $data["photo"] = trim($attribute->value);
1325                                 }
1326                         }
1327                 }
1328
1329                 $data["location"] = $xpath->query("//p[@class='location']")->item(0)->nodeValue;
1330                 $data["about"] = $xpath->query("//p[@class='summary']")->item(0)->nodeValue;
1331
1332                 return $data;
1333         }
1334
1335         /**
1336          * @brief Check for pump.io contact
1337          *
1338          * @param array $webfinger Webfinger data
1339          *
1340          * @return array pump.io data
1341          */
1342         private static function pumpio($webfinger) {
1343
1344                 $data = array();
1345                 foreach ($webfinger["links"] as $link) {
1346                         if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1347                                 && ($link["type"] == "text/html")
1348                                 && ($link["href"] != "")
1349                         ) {
1350                                 $data["url"] = $link["href"];
1351                         } elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
1352                                 $data["notify"] = $link["href"];
1353                         } elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
1354                                 $data["poll"] = $link["href"];
1355                         } elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
1356                                 $data["dialback"] = $link["href"];
1357                         }
1358                 }
1359                 if (isset($data["poll"]) && isset($data["notify"])
1360                         && isset($data["dialback"])
1361                         && isset($data["url"])
1362                 ) {
1363                         // by now we use these fields only for the network type detection
1364                         // So we unset all data that isn't used at the moment
1365                         unset($data["dialback"]);
1366
1367                         $data["network"] = NETWORK_PUMPIO;
1368                 } else {
1369                         return false;
1370                 }
1371
1372                 $profile_data = self::pumpioProfileData($data["url"]);
1373
1374                 if (!$profile_data) {
1375                         return false;
1376                 }
1377
1378                 $data = array_merge($data, $profile_data);
1379
1380                 return $data;
1381         }
1382
1383         /**
1384          * @brief Check page for feed link
1385          *
1386          * @param string $url Page link
1387          *
1388          * @return string feed link
1389          */
1390         private static function getFeedLink($url) {
1391                 $doc = new DOMDocument();
1392
1393                 if (!@$doc->loadHTMLFile($url)) {
1394                         return false;
1395                 }
1396
1397                 $xpath = new DomXPath($doc);
1398
1399                 //$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
1400                 $feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
1401                 if (!is_object($feeds)) {
1402                         return false;
1403                 }
1404
1405                 if ($feeds->length == 0) {
1406                         return false;
1407                 }
1408
1409                 $feed_url = "";
1410
1411                 foreach ($feeds as $feed) {
1412                         $attr = array();
1413                         foreach ($feed->attributes as $attribute) {
1414                                 $attr[$attribute->name] = trim($attribute->value);
1415                         }
1416
1417                         if ($feed_url == "") {
1418                                 $feed_url = $attr["href"];
1419                         }
1420                 }
1421
1422                 return $feed_url;
1423         }
1424
1425         /**
1426          * @brief Check for feed contact
1427          *
1428          * @param string $url Profile link
1429          * @param boolean $probe Do a probe if the page contains a feed link
1430          *
1431          * @return array feed data
1432          */
1433         private static function feed($url, $probe = true) {
1434                 $ret = z_fetch_url($url);
1435                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1436                         return false;
1437                 }
1438                 $feed = $ret['body'];
1439                 $feed_data = feed_import($feed, $dummy1, $dummy2, $dummy3, true);
1440
1441                 if (!$feed_data) {
1442                         if (!$probe) {
1443                                 return false;
1444                         }
1445
1446                         $feed_url = self::getFeedLink($url);
1447
1448                         if (!$feed_url) {
1449                                 return false;
1450                         }
1451
1452                         return self::feed($feed_url, false);
1453                 }
1454
1455                 if ($feed_data["header"]["author-name"] != "") {
1456                         $data["name"] = $feed_data["header"]["author-name"];
1457                 }
1458
1459                 if ($feed_data["header"]["author-nick"] != "") {
1460                         $data["nick"] = $feed_data["header"]["author-nick"];
1461                 }
1462
1463                 if ($feed_data["header"]["author-avatar"] != "") {
1464                         $data["photo"] = $feed_data["header"]["author-avatar"];
1465                 }
1466
1467                 if ($feed_data["header"]["author-id"] != "") {
1468                         $data["alias"] = $feed_data["header"]["author-id"];
1469                 }
1470
1471                 $data["url"] = $url;
1472                 $data["poll"] = $url;
1473
1474                 if ($feed_data["header"]["author-link"] != "") {
1475                         $data["baseurl"] = $feed_data["header"]["author-link"];
1476                 } else {
1477                         $data["baseurl"] = $data["url"];
1478                 }
1479
1480                 $data["network"] = NETWORK_FEED;
1481
1482                 return $data;
1483         }
1484
1485         /**
1486          * @brief Check for mail contact
1487          *
1488          * @param string $uri Profile link
1489          * @param integer $uid User ID
1490          *
1491          * @return array mail data
1492          */
1493         private static function mail($uri, $uid) {
1494
1495                 if (!validate_email($uri)) {
1496                         return false;
1497                 }
1498
1499                 if ($uid != 0) {
1500                         $x = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($uid));
1501
1502                         $r = q("SELECT * FROM `mailacct` WHERE `uid` = %d AND `server` != '' LIMIT 1", intval($uid));
1503
1504                         if (Dbm::is_result($x) && Dbm::is_result($r)) {
1505                                 $mailbox = construct_mailbox_name($r[0]);
1506                                 $password = '';
1507                                 openssl_private_decrypt(hex2bin($r[0]['pass']), $password, $x[0]['prvkey']);
1508                                 $mbox = email_connect($mailbox, $r[0]['user'], $password);
1509                                 if (!mbox) {
1510                                         return false;
1511                                 }
1512                         }
1513
1514                         $msgs = email_poll($mbox, $uri);
1515                         logger('searching '.$uri.', '.count($msgs).' messages found.', LOGGER_DEBUG);
1516
1517                         if (!count($msgs)) {
1518                                 return false;
1519                         }
1520                 }
1521
1522                 $phost = substr($uri, strpos($uri, '@') + 1);
1523
1524                 $data = array();
1525                 $data["addr"]    = $uri;
1526                 $data["network"] = NETWORK_MAIL;
1527                 $data["name"]    = substr($uri, 0, strpos($uri, '@'));
1528                 $data["nick"]    = $data["name"];
1529                 $data["photo"]   = avatar_img($uri);
1530                 $data["url"]     = 'mailto:'.$uri;
1531                 $data["notify"]  = 'smtp '.random_string();
1532                 $data["poll"]    = 'email '.random_string();
1533
1534                 $x = email_msg_meta($mbox, $msgs[0]);
1535                 if (stristr($x[0]->from, $uri)) {
1536                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1537                 } elseif (stristr($x[0]->to, $uri)) {
1538                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1539                 }
1540                 if (isset($adr)) {
1541                         foreach ($adr as $feadr) {
1542                                 if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
1543                                         &&(strcasecmp($feadr->host, $phost) == 0)
1544                                         && (strlen($feadr->personal))
1545                                 ) {
1546                                         $personal = imap_mime_header_decode($feadr->personal);
1547                                         $data["name"] = "";
1548                                         foreach ($personal as $perspart) {
1549                                                 if ($perspart->charset != "default") {
1550                                                         $data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1551                                                 } else {
1552                                                         $data["name"] .= $perspart->text;
1553                                                 }
1554                                         }
1555
1556                                         $data["name"] = notags($data["name"]);
1557                                 }
1558                         }
1559                 }
1560                 if (!empty($mbox)) {
1561                         imap_close($mbox);
1562                 }
1563
1564                 return $data;
1565         }
1566
1567         /**
1568          * @brief Mix two paths together to possibly fix missing parts
1569          *
1570          * @param string $avatar Path to the avatar
1571          * @param string $base Another path that is hopefully complete
1572          *
1573          * @return string fixed avatar path
1574          */
1575         public static function fixAvatar($avatar, $base) {
1576                 $base_parts = parse_url($base);
1577
1578                 // Remove all parts that could create a problem
1579                 unset($base_parts['path']);
1580                 unset($base_parts['query']);
1581                 unset($base_parts['fragment']);
1582
1583                 $avatar_parts = parse_url($avatar);
1584
1585                 // Now we mix them
1586                 $parts = array_merge($base_parts, $avatar_parts);
1587
1588                 // And put them together again
1589                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
1590                 $host     = isset($parts['host'])     ? $parts['host']           : '';
1591                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
1592                 $path     = isset($parts['path'])     ? $parts['path']           : '';
1593                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
1594                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
1595
1596                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
1597
1598                 logger('Base: '.$base.' - Avatar: '.$avatar.' - Fixed: '.$fixed, LOGGER_DATA);
1599
1600                 return $fixed;
1601         }
1602 }