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