src/Network/Probe.php

   1 <?php
   2 /**
   3  * @file src/Network/Probe.php
   4  */
   5 namespace Friendica\Network;
   6
   7 /**
   8  * @file src/Network/Probe.php
   9  * @brief Functions for probing URL
  10  */
  11
  12 use Friendica\App;
  13 use Friendica\Core\System;
  14 use Friendica\Core\Cache;
  15 use Friendica\Core\Config;
  16 use Friendica\Database\DBM;
  17 use Friendica\Model\Profile;
  18 use Friendica\Protocol\Email;
  19 use Friendica\Protocol\Feed;
  20 use Friendica\Util\Crypto;
  21 use Friendica\Util\Network;
  22 use Friendica\Util\XML;
  23 use Friendica\Util\DateTimeFormat;
  24 use dba;
  25 use DOMXPath;
  26 use DOMDocument;
  27
  28 require_once 'include/dba.php';
  29
  30 /**
  31  * @brief This class contain functions for probing URL
  32  *
  33  */
  34 class Probe
  35 {
  36         private static $baseurl;
  37
  38         /**
  39          * @brief Rearrange the array so that it always has the same order
  40          *
  41          * @param array $data Unordered data
  42          *
  43          * @return array Ordered data
  44          */
  45         private static function rearrangeData($data)
  46         {
  47                 $fields = ["name", "nick", "guid", "url", "addr", "alias",
  48                                 "photo", "community", "keywords", "location", "about",
  49                                 "batch", "notify", "poll", "request", "confirm", "poco",
  50                                 "priority", "network", "pubkey", "baseurl"];
  51
  52                 $newdata = [];
  53                 foreach ($fields as $field) {
  54                         if (isset($data[$field])) {
  55                                 $newdata[$field] = $data[$field];
  56                         } else {
  57                                 $newdata[$field] = "";
  58                         }
  59                 }
  60
  61                 // We don't use the "priority" field anymore and replace it with a dummy.
  62                 $newdata["priority"] = 0;
  63
  64                 return $newdata;
  65         }
  66
  67         /**
  68          * @brief Check if the hostname belongs to the own server
  69          *
  70          * @param string $host The hostname that is to be checked
  71          *
  72          * @return bool Does the testes hostname belongs to the own server?
  73          */
  74         private static function ownHost($host)
  75         {
  76                 $own_host = get_app()->get_hostname();
  77
  78                 $parts = parse_url($host);
  79
  80                 if (!isset($parts['scheme'])) {
  81                         $parts = parse_url('http://'.$host);
  82                 }
  83
  84                 if (!isset($parts['host'])) {
  85                         return false;
  86                 }
  87                 return $parts['host'] == $own_host;
  88         }
  89
  90         /**
  91          * @brief Probes for webfinger path via "host-meta"
  92          *
  93          * We have to check if the servers in the future still will offer this.
  94          * It seems as if it was dropped from the standard.
  95          *
  96          * @param string $host The host part of an url
  97          *
  98          * @return array with template and type of the webfinger template for JSON or XML
  99          */
 100         private static function hostMeta($host)
 101         {
 102                 // Reset the static variable
 103                 self::$baseurl = '';
 104
 105                 $ssl_url = "https://".$host."/.well-known/host-meta";
 106                 $url = "http://".$host."/.well-known/host-meta";
 107
 108                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 109                 $redirects = 0;
 110
 111                 logger("Probing for ".$host, LOGGER_DEBUG);
 112
 113                 $ret = Network::curl($ssl_url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 114                 if ($ret['success']) {
 115                         $xml = $ret['body'];
 116                         $xrd = XML::parseString($xml, false);
 117                         $host_url = 'https://'.$host;
 118                 }
 119
 120                 if (!is_object($xrd)) {
 121                         $ret = Network::curl($url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => 'application/xrd+xml']);
 122                         if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 123                                 logger("Probing timeout for ".$url, LOGGER_DEBUG);
 124                                 return false;
 125                         }
 126                         $xml = $ret['body'];
 127                         $xrd = XML::parseString($xml, false);
 128                         $host_url = 'http://'.$host;
 129                 }
 130                 if (!is_object($xrd)) {
 131                         logger("No xrd object found for ".$host, LOGGER_DEBUG);
 132                         return [];
 133                 }
 134
 135                 $links = XML::elementToArray($xrd);
 136                 if (!isset($links["xrd"]["link"])) {
 137                         logger("No xrd data found for ".$host, LOGGER_DEBUG);
 138                         return [];
 139                 }
 140
 141                 $lrdd = [];
 142                 // The following webfinger path is defined in RFC 7033 https://tools.ietf.org/html/rfc7033
 143                 // Problem is that Hubzilla currently doesn't provide all data in the JSON webfinger
 144                 // compared to the XML webfinger. So this is commented out by now.
 145                 // $lrdd = array("application/jrd+json" => $host_url.'/.well-known/webfinger?resource={uri}');
 146
 147                 foreach ($links["xrd"]["link"] as $value => $link) {
 148                         if (!empty($link["@attributes"])) {
 149                                 $attributes = $link["@attributes"];
 150                         } elseif ($value == "@attributes") {
 151                                 $attributes = $link;
 152                         } else {
 153                                 continue;
 154                         }
 155
 156                         if (($attributes["rel"] == "lrdd") && !empty($attributes["template"])) {
 157                                 $type = (empty($attributes["type"]) ? '' : $attributes["type"]);
 158
 159                                 $lrdd[$type] = $attributes["template"];
 160                         }
 161                 }
 162
 163                 self::$baseurl = "http://".$host;
 164
 165                 logger("Probing successful for ".$host, LOGGER_DEBUG);
 166
 167                 return $lrdd;
 168         }
 169
 170         /**
 171          * @brief Perform Webfinger lookup and return DFRN data
 172          *
 173          * Given an email style address, perform webfinger lookup and
 174          * return the resulting DFRN profile URL, or if no DFRN profile URL
 175          * is located, returns an OStatus subscription template (prefixed
 176          * with the string 'stat:' to identify it as on OStatus template).
 177          * If this isn't an email style address just return $webbie.
 178          * Return an empty string if email-style addresses but webfinger fails,
 179          * or if the resultant personal XRD doesn't contain a supported
 180          * subscription/friend-request attribute.
 181          *
 182          * amended 7/9/2011 to return an hcard which could save potentially loading
 183          * a lengthy content page to scrape dfrn attributes
 184          *
 185          * @param string $webbie    Address that should be probed
 186          * @param string $hcard_url Link to the hcard - is returned by reference
 187          *
 188          * @return string profile link
 189          */
 190         public static function webfingerDfrn($webbie, &$hcard_url)
 191         {
 192                 $profile_link = '';
 193
 194                 $links = self::lrdd($webbie);
 195                 logger('webfingerDfrn: '.$webbie.':'.print_r($links, true), LOGGER_DATA);
 196                 if (count($links)) {
 197                         foreach ($links as $link) {
 198                                 if ($link['@attributes']['rel'] === NAMESPACE_DFRN) {
 199                                         $profile_link = $link['@attributes']['href'];
 200                                 }
 201                                 if (($link['@attributes']['rel'] === NAMESPACE_OSTATUSSUB) && ($profile_link == "")) {
 202                                         $profile_link = 'stat:'.$link['@attributes']['template'];
 203                                 }
 204                                 if ($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard') {
 205                                         $hcard_url = $link['@attributes']['href'];
 206                                 }
 207                         }
 208                 }
 209                 return $profile_link;
 210         }
 211
 212         /**
 213          * @brief Check an URI for LRDD data
 214          *
 215          * this is a replacement for the "lrdd" function.
 216          * It isn't used in this class and has some redundancies in the code.
 217          * When time comes we can check the existing calls for "lrdd" if we can rework them.
 218          *
 219          * @param string $uri Address that should be probed
 220          *
 221          * @return array uri data
 222          */
 223         public static function lrdd($uri)
 224         {
 225                 $lrdd = self::hostMeta($uri);
 226                 $webfinger = null;
 227
 228                 if (is_bool($lrdd)) {
 229                         return [];
 230                 }
 231
 232                 if (!$lrdd) {
 233                         $parts = @parse_url($uri);
 234                         if (!$parts) {
 235                                 return [];
 236                         }
 237
 238                         $host = $parts["host"];
 239                         if (!empty($parts["port"])) {
 240                                 $host .= ':'.$parts["port"];
 241                         }
 242
 243                         $path_parts = explode("/", trim($parts["path"], "/"));
 244
 245                         $nick = array_pop($path_parts);
 246
 247                         do {
 248                                 $lrdd = self::hostMeta($host);
 249                                 $host .= "/".array_shift($path_parts);
 250                         } while (!$lrdd && (sizeof($path_parts) > 0));
 251                 }
 252
 253                 if (!$lrdd) {
 254                         logger("No lrdd data found for ".$uri, LOGGER_DEBUG);
 255                         return [];
 256                 }
 257
 258                 foreach ($lrdd as $type => $template) {
 259                         if ($webfinger) {
 260                                 continue;
 261                         }
 262
 263                         $path = str_replace('{uri}', urlencode($uri), $template);
 264                         $webfinger = self::webfinger($path, $type);
 265
 266                         if (!$webfinger && (strstr($uri, "@"))) {
 267                                 $path = str_replace('{uri}', urlencode("acct:".$uri), $template);
 268                                 $webfinger = self::webfinger($path, $type);
 269                         }
 270
 271                         // Special treatment for Mastodon
 272                         // Problem is that Mastodon uses an URL format like http://domain.tld/@nick
 273                         // But the webfinger for this format fails.
 274                         if (!$webfinger && !empty($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), $template);
 281                                 $webfinger = self::webfinger($path, $type);
 282                         }
 283                 }
 284
 285                 if (!is_array($webfinger["links"])) {
 286                         logger("No webfinger links found for ".$uri, LOGGER_DEBUG);
 287                         return false;
 288                 }
 289
 290                 $data = [];
 291
 292                 foreach ($webfinger["links"] as $link) {
 293                         $data[] = ["@attributes" => $link];
 294                 }
 295
 296                 if (is_array($webfinger["aliases"])) {
 297                         foreach ($webfinger["aliases"] as $alias) {
 298                                 $data[] = ["@attributes" =>
 299                                                         ["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 = -1, $cache = true)
 318         {
 319                 if ($cache) {
 320                         $result = Cache::get("Probe::uri:".$network.":".$uri);
 321                         if (!is_null($result)) {
 322                                 return $result;
 323                         }
 324                 }
 325
 326                 if ($uid == -1) {
 327                         $uid = local_user();
 328                 }
 329
 330                 $data = self::detect($uri, $network, $uid);
 331
 332                 if (!isset($data["url"])) {
 333                         $data["url"] = $uri;
 334                 }
 335
 336                 if (x($data, "photo")) {
 337                         $data["baseurl"] = Network::getUrlMatch(normalise_link($data["baseurl"]), normalise_link($data["photo"]));
 338                 } else {
 339                         $data["photo"] = System::baseUrl().'/images/person-175.jpg';
 340                 }
 341
 342                 if (empty($data["name"])) {
 343                         if (!empty($data["nick"])) {
 344                                 $data["name"] = $data["nick"];
 345                         }
 346
 347                         if (!x($data, "name")) {
 348                                 $data["name"] = $data["url"];
 349                         }
 350                 }
 351
 352                 if (empty($data["nick"])) {
 353                         $data["nick"] = strtolower($data["name"]);
 354
 355                         if (strpos($data['nick'], ' ')) {
 356                                 $data['nick'] = trim(substr($data['nick'], 0, strpos($data['nick'], ' ')));
 357                         }
 358                 }
 359
 360                 if (!empty(self::$baseurl)) {
 361                         $data["baseurl"] = self::$baseurl;
 362                 }
 363
 364                 if (empty($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($data['network'], [NETWORK_PHANTOM, NETWORK_MAIL])) {
 372                         Cache::set("Probe::uri:".$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                                 $fields = ['name' => $data['name'],
 387                                                 'nick' => $data['nick'],
 388                                                 'url' => $data['url'],
 389                                                 'addr' => $data['addr'],
 390                                                 'photo' => $data['photo'],
 391                                                 'keywords' => $data['keywords'],
 392                                                 'location' => $data['location'],
 393                                                 'about' => $data['about'],
 394                                                 'notify' => $data['notify'],
 395                                                 'network' => $data['network'],
 396                                                 'server_url' => $data['baseurl']];
 397
 398                                 $fieldnames = [];
 399
 400                                 foreach ($fields as $key => $val) {
 401                                         if (empty($val)) {
 402                                                 unset($fields[$key]);
 403                                         } else {
 404                                                 $fieldnames[] = $key;
 405                                         }
 406                                 }
 407
 408                                 $fields['updated'] = DBM::date();
 409
 410                                 $condition = ['nurl' => normalise_link($data["url"])];
 411
 412                                 $old_fields = dba::selectFirst('gcontact', $fieldnames, $condition);
 413
 414                                 // When the gcontact doesn't exist, the value "true" will trigger an insert.
 415                                 // In difference to the public contacts we want to have every contact
 416                                 // in the world in our global contacts.
 417                                 if (!$old_fields) {
 418                                         $old_fields = true;
 419
 420                                         // These values have to be set only on insert
 421                                         $fields['photo'] = $data['photo'];
 422                                         $fields['created'] = DateTimeFormat::utcNow();
 423                                 }
 424
 425                                 dba::update('gcontact', $fields, $condition, $old_fields);
 426
 427                                 $fields = ['name' => $data['name'],
 428                                                 'nick' => $data['nick'],
 429                                                 'url' => $data['url'],
 430                                                 'addr' => $data['addr'],
 431                                                 'alias' => $data['alias'],
 432                                                 'keywords' => $data['keywords'],
 433                                                 'location' => $data['location'],
 434                                                 'about' => $data['about'],
 435                                                 'batch' => $data['batch'],
 436                                                 'notify' => $data['notify'],
 437                                                 'poll' => $data['poll'],
 438                                                 'request' => $data['request'],
 439                                                 'confirm' => $data['confirm'],
 440                                                 'poco' => $data['poco'],
 441                                                 'network' => $data['network'],
 442                                                 'pubkey' => $data['pubkey'],
 443                                                 'priority' => $data['priority'],
 444                                                 'writable' => true,
 445                                                 'rel' => CONTACT_IS_SHARING];
 446
 447                                 $fieldnames = [];
 448
 449                                 foreach ($fields as $key => $val) {
 450                                         if (empty($val)) {
 451                                                 unset($fields[$key]);
 452                                         } else {
 453                                                 $fieldnames[] = $key;
 454                                         }
 455                                 }
 456
 457                                 $condition = ['nurl' => normalise_link($data["url"]), 'self' => false, 'uid' => 0];
 458
 459                                 // "$old_fields" will return a "false" when the contact doesn't exist.
 460                                 // This won't trigger an insert. This is intended, since we only need
 461                                 // public contacts for everyone we store items from.
 462                                 // We don't need to store every contact on the planet.
 463                                 $old_fields = dba::selectFirst('contact', $fieldnames, $condition);
 464
 465                                 $fields['name-date'] = DateTimeFormat::utcNow();
 466                                 $fields['uri-date'] = DateTimeFormat::utcNow();
 467                                 $fields['success_update'] = DateTimeFormat::utcNow();
 468
 469                                 dba::update('contact', $fields, $condition, $old_fields);
 470                         }
 471                 }
 472
 473                 return $data;
 474         }
 475
 476         /**
 477          * @brief Switch the scheme of an url between http and https
 478          *
 479          * @param string $url URL
 480          *
 481          * @return string switched URL
 482          */
 483         private static function switchScheme($url)
 484         {
 485                 $parts = parse_url($url);
 486
 487                 if (!isset($parts['scheme'])) {
 488                         return $url;
 489                 }
 490
 491                 if ($parts['scheme'] == 'http') {
 492                         $url = str_replace('http://', 'https://', $url);
 493                 } elseif ($parts['scheme'] == 'https') {
 494                         $url = str_replace('https://', 'http://', $url);
 495                 }
 496
 497                 return $url;
 498         }
 499
 500         /**
 501          * @brief Checks if a profile url should be OStatus but only provides partial information
 502          *
 503          * @param array  $webfinger Webfinger data
 504          * @param string $lrdd      Path template for webfinger request
 505          * @param string $type      type
 506          *
 507          * @return array fixed webfinger data
 508          */
 509         private static function fixOStatus($webfinger, $lrdd, $type)
 510         {
 511                 if (empty($webfinger['links']) || empty($webfinger['subject'])) {
 512                         return $webfinger;
 513                 }
 514
 515                 $is_ostatus = false;
 516                 $has_key = false;
 517
 518                 foreach ($webfinger['links'] as $link) {
 519                         if ($link['rel'] == NAMESPACE_OSTATUSSUB) {
 520                                 $is_ostatus = true;
 521                         }
 522                         if ($link['rel'] == 'magic-public-key') {
 523                                 $has_key = true;
 524                         }
 525                 }
 526
 527                 if (!$is_ostatus || $has_key) {
 528                         return $webfinger;
 529                 }
 530
 531                 $url = self::switchScheme($webfinger['subject']);
 532                 $path = str_replace('{uri}', urlencode($url), $lrdd);
 533                 $webfinger2 = self::webfinger($path, $type);
 534
 535                 // Is the new webfinger detectable as OStatus?
 536                 if (self::ostatus($webfinger2, true)) {
 537                         $webfinger = $webfinger2;
 538                 }
 539
 540                 return $webfinger;
 541         }
 542
 543         /**
 544          * @brief Fetch information (protocol endpoints and user information) about a given uri
 545          *
 546          * This function is only called by the "uri" function that adds caching and rearranging of data.
 547          *
 548          * @param string  $uri     Address that should be probed
 549          * @param string  $network Test for this specific network
 550          * @param integer $uid     User ID for the probe (only used for mails)
 551          *
 552          * @return array uri data
 553          */
 554         private static function detect($uri, $network, $uid)
 555         {
 556                 $parts = parse_url($uri);
 557
 558                 if (!empty($parts["scheme"]) && !empty($parts["host"]) && !empty($parts["path"])) {
 559                         $host = $parts["host"];
 560                         if (!empty($parts["port"])) {
 561                                 $host .= ':'.$parts["port"];
 562                         }
 563
 564                         if ($host == 'twitter.com') {
 565                                 return ["network" => NETWORK_TWITTER];
 566                         }
 567                         $lrdd = self::hostMeta($host);
 568
 569                         if (is_bool($lrdd)) {
 570                                 return [];
 571                         }
 572
 573                         $path_parts = explode("/", trim($parts["path"], "/"));
 574
 575                         while (!$lrdd && (sizeof($path_parts) > 1)) {
 576                                 $host .= "/".array_shift($path_parts);
 577                                 $lrdd = self::hostMeta($host);
 578                         }
 579                         if (!$lrdd) {
 580                                 logger('No XRD data was found for '.$uri, LOGGER_DEBUG);
 581                                 return self::feed($uri);
 582                         }
 583                         $nick = array_pop($path_parts);
 584
 585                         // Mastodon uses a "@" as prefix for usernames in their url format
 586                         $nick = ltrim($nick, '@');
 587
 588                         $addr = $nick."@".$host;
 589                 } elseif (strstr($uri, '@')) {
 590                         // If the URI starts with "mailto:" then jump directly to the mail detection
 591                         if (strpos($uri, 'mailto:') !== false) {
 592                                 $uri = str_replace('mailto:', '', $uri);
 593                                 return self::mail($uri, $uid);
 594                         }
 595
 596                         if ($network == NETWORK_MAIL) {
 597                                 return self::mail($uri, $uid);
 598                         }
 599                         // Remove "acct:" from the URI
 600                         $uri = str_replace('acct:', '', $uri);
 601
 602                         $host = substr($uri, strpos($uri, '@') + 1);
 603                         $nick = substr($uri, 0, strpos($uri, '@'));
 604
 605                         if (strpos($uri, '@twitter.com')) {
 606                                 return ["network" => NETWORK_TWITTER];
 607                         }
 608                         $lrdd = self::hostMeta($host);
 609
 610                         if (is_bool($lrdd)) {
 611                                 return [];
 612                         }
 613
 614                         if (!$lrdd) {
 615                                 logger('No XRD data was found for '.$uri, LOGGER_DEBUG);
 616                                 return self::mail($uri, $uid);
 617                         }
 618                         $addr = $uri;
 619                 } else {
 620                         logger("Uri ".$uri." was not detectable", LOGGER_DEBUG);
 621                         return false;
 622                 }
 623
 624                 $webfinger = false;
 625
 626                 /// @todo Do we need the prefix "acct:" or "acct://"?
 627
 628                 foreach ($lrdd as $type => $template) {
 629                         if ($webfinger) {
 630                                 continue;
 631                         }
 632
 633                         // At first try it with the given uri
 634                         $path = str_replace('{uri}', urlencode($uri), $template);
 635                         $webfinger = self::webfinger($path, $type);
 636
 637                         // Fix possible problems with GNU Social probing to wrong scheme
 638                         $webfinger = self::fixOStatus($webfinger, $template, $type);
 639
 640                         // We cannot be sure that the detected address was correct, so we don't use the values
 641                         if ($webfinger && ($uri != $addr)) {
 642                                 $nick = "";
 643                                 $addr = "";
 644                         }
 645
 646                         // Try webfinger with the address (user@domain.tld)
 647                         if (!$webfinger) {
 648                                 $path = str_replace('{uri}', urlencode($addr), $template);
 649                                 $webfinger = self::webfinger($path, $type);
 650                         }
 651
 652                         // Mastodon needs to have it with "acct:"
 653                         if (!$webfinger) {
 654                                 $path = str_replace('{uri}', urlencode("acct:".$addr), $template);
 655                                 $webfinger = self::webfinger($path, $type);
 656                         }
 657                 }
 658
 659                 if (!$webfinger) {
 660                         return self::feed($uri);
 661                 }
 662
 663                 $result = false;
 664
 665                 logger("Probing ".$uri, LOGGER_DEBUG);
 666
 667                 if (in_array($network, ["", NETWORK_DFRN])) {
 668                         $result = self::dfrn($webfinger);
 669                 }
 670                 if ((!$result && ($network == "")) || ($network == NETWORK_DIASPORA)) {
 671                         $result = self::diaspora($webfinger);
 672                 }
 673                 if ((!$result && ($network == "")) || ($network == NETWORK_OSTATUS)) {
 674                         $result = self::ostatus($webfinger);
 675                 }
 676                 if ((!$result && ($network == "")) || ($network == NETWORK_PUMPIO)) {
 677                         $result = self::pumpio($webfinger, $addr);
 678                 }
 679                 if ((!$result && ($network == "")) || ($network == NETWORK_FEED)) {
 680                         $result = self::feed($uri);
 681                 } else {
 682                         // We overwrite the detected nick with our try if the previois routines hadn't detected it.
 683                         // Additionally it is overwritten when the nickname doesn't make sense (contains spaces).
 684                         if ((empty($result["nick"]) || (strstr($result["nick"], " "))) && ($nick != "")) {
 685                                 $result["nick"] = $nick;
 686                         }
 687
 688                         if (empty($result["addr"]) && ($addr != "")) {
 689                                 $result["addr"] = $addr;
 690                         }
 691                 }
 692
 693                 logger($uri." is ".$result["network"], LOGGER_DEBUG);
 694
 695                 if (empty($result["baseurl"])) {
 696                         $pos = strpos($result["url"], $host);
 697                         if ($pos) {
 698                                 $result["baseurl"] = substr($result["url"], 0, $pos).$host;
 699                         }
 700                 }
 701                 return $result;
 702         }
 703
 704         /**
 705          * @brief Perform a webfinger request.
 706          *
 707          * For details see RFC 7033: <https://tools.ietf.org/html/rfc7033>
 708          *
 709          * @param string $url  Address that should be probed
 710          * @param string $type type
 711          *
 712          * @return array webfinger data
 713          */
 714         private static function webfinger($url, $type)
 715         {
 716                 $xrd_timeout = Config::get('system', 'xrd_timeout', 20);
 717                 $redirects = 0;
 718
 719                 $ret = Network::curl($url, false, $redirects, ['timeout' => $xrd_timeout, 'accept_content' => $type]);
 720                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 721                         return false;
 722                 }
 723                 $data = $ret['body'];
 724
 725                 $webfinger = json_decode($data, true);
 726                 if (is_array($webfinger)) {
 727                         if (!isset($webfinger["links"])) {
 728                                 logger("No json webfinger links for ".$url, LOGGER_DEBUG);
 729                                 return false;
 730                         }
 731                         return $webfinger;
 732                 }
 733
 734                 // If it is not JSON, maybe it is XML
 735                 $xrd = XML::parseString($data, false);
 736                 if (!is_object($xrd)) {
 737                         logger("No webfinger data retrievable for ".$url, LOGGER_DEBUG);
 738                         return false;
 739                 }
 740
 741                 $xrd_arr = XML::elementToArray($xrd);
 742                 if (!isset($xrd_arr["xrd"]["link"])) {
 743                         logger("No XML webfinger links for ".$url, LOGGER_DEBUG);
 744                         return false;
 745                 }
 746
 747                 $webfinger = [];
 748
 749                 if (!empty($xrd_arr["xrd"]["subject"])) {
 750                         $webfinger["subject"] = $xrd_arr["xrd"]["subject"];
 751                 }
 752
 753                 if (!empty($xrd_arr["xrd"]["alias"])) {
 754                         $webfinger["aliases"] = $xrd_arr["xrd"]["alias"];
 755                 }
 756
 757                 $webfinger["links"] = [];
 758
 759                 foreach ($xrd_arr["xrd"]["link"] as $value => $data) {
 760                         if (!empty($data["@attributes"])) {
 761                                 $attributes = $data["@attributes"];
 762                         } elseif ($value == "@attributes") {
 763                                 $attributes = $data;
 764                         } else {
 765                                 continue;
 766                         }
 767
 768                         $webfinger["links"][] = $attributes;
 769                 }
 770                 return $webfinger;
 771         }
 772
 773         /**
 774          * @brief Poll the Friendica specific noscrape page.
 775          *
 776          * "noscrape" is a faster alternative to fetch the data from the hcard.
 777          * This functionality was originally created for the directory.
 778          *
 779          * @param string $noscrape_url Link to the noscrape page
 780          * @param array  $data         The already fetched data
 781          *
 782          * @return array noscrape data
 783          */
 784         private static function pollNoscrape($noscrape_url, $data)
 785         {
 786                 $ret = Network::curl($noscrape_url);
 787                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
 788                         return false;
 789                 }
 790                 $content = $ret['body'];
 791                 if (!$content) {
 792                         logger("Empty body for ".$noscrape_url, LOGGER_DEBUG);
 793                         return false;
 794                 }
 795
 796                 $json = json_decode($content, true);
 797                 if (!is_array($json)) {
 798                         logger("No json data for ".$noscrape_url, LOGGER_DEBUG);
 799                         return false;
 800                 }
 801
 802                 if (!empty($json["fn"])) {
 803                         $data["name"] = $json["fn"];
 804                 }
 805
 806                 if (!empty($json["addr"])) {
 807                         $data["addr"] = $json["addr"];
 808                 }
 809
 810                 if (!empty($json["nick"])) {
 811                         $data["nick"] = $json["nick"];
 812                 }
 813
 814                 if (!empty($json["guid"])) {
 815                         $data["guid"] = $json["guid"];
 816                 }
 817
 818                 if (!empty($json["comm"])) {
 819                         $data["community"] = $json["comm"];
 820                 }
 821
 822                 if (!empty($json["tags"])) {
 823                         $keywords = implode(" ", $json["tags"]);
 824                         if ($keywords != "") {
 825                                 $data["keywords"] = $keywords;
 826                         }
 827                 }
 828
 829                 $location = Profile::formatLocation($json);
 830                 if ($location) {
 831                         $data["location"] = $location;
 832                 }
 833
 834                 if (!empty($json["about"])) {
 835                         $data["about"] = $json["about"];
 836                 }
 837
 838                 if (!empty($json["key"])) {
 839                         $data["pubkey"] = $json["key"];
 840                 }
 841
 842                 if (!empty($json["photo"])) {
 843                         $data["photo"] = $json["photo"];
 844                 }
 845
 846                 if (!empty($json["dfrn-request"])) {
 847                         $data["request"] = $json["dfrn-request"];
 848                 }
 849
 850                 if (!empty($json["dfrn-confirm"])) {
 851                         $data["confirm"] = $json["dfrn-confirm"];
 852                 }
 853
 854                 if (!empty($json["dfrn-notify"])) {
 855                         $data["notify"] = $json["dfrn-notify"];
 856                 }
 857
 858                 if (!empty($json["dfrn-poll"])) {
 859                         $data["poll"] = $json["dfrn-poll"];
 860                 }
 861
 862                 return $data;
 863         }
 864
 865         /**
 866          * @brief Check for valid DFRN data
 867          *
 868          * @param array $data DFRN data
 869          *
 870          * @return int Number of errors
 871          */
 872         public static function validDfrn($data)
 873         {
 874                 $errors = 0;
 875                 if (!isset($data['key'])) {
 876                         $errors ++;
 877                 }
 878                 if (!isset($data['dfrn-request'])) {
 879                         $errors ++;
 880                 }
 881                 if (!isset($data['dfrn-confirm'])) {
 882                         $errors ++;
 883                 }
 884                 if (!isset($data['dfrn-notify'])) {
 885                         $errors ++;
 886                 }
 887                 if (!isset($data['dfrn-poll'])) {
 888                         $errors ++;
 889                 }
 890                 return $errors;
 891         }
 892
 893         /**
 894          * @brief Fetch data from a DFRN profile page and via "noscrape"
 895          *
 896          * @param string $profile_link Link to the profile page
 897          *
 898          * @return array profile data
 899          */
 900         public static function profile($profile_link)
 901         {
 902                 $data = [];
 903
 904                 logger("Check profile ".$profile_link, LOGGER_DEBUG);
 905
 906                 // Fetch data via noscrape - this is faster
 907                 $noscrape_url = str_replace(["/hcard/", "/profile/"], "/noscrape/", $profile_link);
 908                 $data = self::pollNoscrape($noscrape_url, $data);
 909
 910                 if (!isset($data["notify"])
 911                         || !isset($data["confirm"])
 912                         || !isset($data["request"])
 913                         || !isset($data["poll"])
 914                         || !isset($data["poco"])
 915                         || !isset($data["name"])
 916                         || !isset($data["photo"])
 917                 ) {
 918                         $data = self::pollHcard($profile_link, $data, true);
 919                 }
 920
 921                 $prof_data = [];
 922                 $prof_data["addr"]         = $data["addr"];
 923                 $prof_data["nick"]         = $data["nick"];
 924                 $prof_data["dfrn-request"] = $data["request"];
 925                 $prof_data["dfrn-confirm"] = $data["confirm"];
 926                 $prof_data["dfrn-notify"]  = $data["notify"];
 927                 $prof_data["dfrn-poll"]    = $data["poll"];
 928                 $prof_data["dfrn-poco"]    = $data["poco"];
 929                 $prof_data["photo"]        = $data["photo"];
 930                 $prof_data["fn"]           = $data["name"];
 931                 $prof_data["key"]          = $data["pubkey"];
 932
 933                 logger("Result for profile ".$profile_link.": ".print_r($prof_data, true), LOGGER_DEBUG);
 934
 935                 return $prof_data;
 936         }
 937
 938         /**
 939          * @brief Check for DFRN contact
 940          *
 941          * @param array $webfinger Webfinger data
 942          *
 943          * @return array DFRN data
 944          */
 945         private static function dfrn($webfinger)
 946         {
 947                 $hcard_url = "";
 948                 $data = [];
 949                 foreach ($webfinger["links"] as $link) {
 950                         if (($link["rel"] == NAMESPACE_DFRN) && ($link["href"] != "")) {
 951                                 $data["network"] = NETWORK_DFRN;
 952                         } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
 953                                 $data["poll"] = $link["href"];
 954                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && ($link["type"] == "text/html") && ($link["href"] != "")) {
 955                                 $data["url"] = $link["href"];
 956                         } elseif (($link["rel"] == "http://microformats.org/profile/hcard") && ($link["href"] != "")) {
 957                                 $hcard_url = $link["href"];
 958                         } elseif (($link["rel"] == NAMESPACE_POCO) && ($link["href"] != "")) {
 959                                 $data["poco"] = $link["href"];
 960                         } elseif (($link["rel"] == "http://webfinger.net/rel/avatar") && ($link["href"] != "")) {
 961                                 $data["photo"] = $link["href"];
 962                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && ($link["href"] != "")) {
 963                                 $data["baseurl"] = trim($link["href"], '/');
 964                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && ($link["href"] != "")) {
 965                                 $data["guid"] = $link["href"];
 966                         } elseif (($link["rel"] == "diaspora-public-key") && ($link["href"] != "")) {
 967                                 $data["pubkey"] = base64_decode($link["href"]);
 968
 969                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
 970                                 if (strstr($data["pubkey"], 'RSA ')) {
 971                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
 972                                 }
 973                         }
 974                 }
 975
 976                 if (is_array($webfinger["aliases"])) {
 977                         foreach ($webfinger["aliases"] as $alias) {
 978                                 if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
 979                                         $data["alias"] = $alias;
 980                                 } elseif (substr($alias, 0, 5) == 'acct:') {
 981                                         $data["addr"] = substr($alias, 5);
 982                                 }
 983                         }
 984                 }
 985
 986                 if (substr($webfinger["subject"], 0, 5) == "acct:") {
 987                         $data["addr"] = substr($webfinger["subject"], 5);
 988                 }
 989
 990                 if (!isset($data["network"]) || ($hcard_url == "")) {
 991                         return false;
 992                 }
 993
 994                 // Fetch data via noscrape - this is faster
 995                 $noscrape_url = str_replace("/hcard/", "/noscrape/", $hcard_url);
 996                 $data = self::pollNoscrape($noscrape_url, $data);
 997
 998                 if (isset($data["notify"])
 999                         && isset($data["confirm"])
1000                         && isset($data["request"])
1001                         && isset($data["poll"])
1002                         && isset($data["name"])
1003                         && isset($data["photo"])
1004                 ) {
1005                         return $data;
1006                 }
1007
1008                 $data = self::pollHcard($hcard_url, $data, true);
1009
1010                 return $data;
1011         }
1012
1013         /**
1014          * @brief Poll the hcard page (Diaspora and Friendica specific)
1015          *
1016          * @param string  $hcard_url Link to the hcard page
1017          * @param array   $data      The already fetched data
1018          * @param boolean $dfrn      Poll DFRN specific data
1019          *
1020          * @return array hcard data
1021          */
1022         private static function pollHcard($hcard_url, $data, $dfrn = false)
1023         {
1024                 $ret = Network::curl($hcard_url);
1025                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1026                         return false;
1027                 }
1028                 $content = $ret['body'];
1029                 if (!$content) {
1030                         return false;
1031                 }
1032
1033                 $doc = new DOMDocument();
1034                 if (!@$doc->loadHTML($content)) {
1035                         return false;
1036                 }
1037
1038                 $xpath = new DomXPath($doc);
1039
1040                 $vcards = $xpath->query("//div[contains(concat(' ', @class, ' '), ' vcard ')]");
1041                 if (!is_object($vcards)) {
1042                         return false;
1043                 }
1044
1045                 if ($vcards->length > 0) {
1046                         $vcard = $vcards->item(0);
1047
1048                         // We have to discard the guid from the hcard in favour of the guid from lrdd
1049                         // Reason: Hubzilla doesn't use the value "uid" in the hcard like Diaspora does.
1050                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' uid ')]", $vcard); // */
1051                         if (($search->length > 0) && ($data["guid"] == "")) {
1052                                 $data["guid"] = $search->item(0)->nodeValue;
1053                         }
1054
1055                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' nickname ')]", $vcard); // */
1056                         if ($search->length > 0) {
1057                                 $data["nick"] = $search->item(0)->nodeValue;
1058                         }
1059
1060                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' fn ')]", $vcard); // */
1061                         if ($search->length > 0) {
1062                                 $data["name"] = $search->item(0)->nodeValue;
1063                         }
1064
1065                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' searchable ')]", $vcard); // */
1066                         if ($search->length > 0) {
1067                                 $data["searchable"] = $search->item(0)->nodeValue;
1068                         }
1069
1070                         $search = $xpath->query("//*[contains(concat(' ', @class, ' '), ' key ')]", $vcard); // */
1071                         if ($search->length > 0) {
1072                                 $data["pubkey"] = $search->item(0)->nodeValue;
1073                                 if (strstr($data["pubkey"], 'RSA ')) {
1074                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1075                                 }
1076                         }
1077
1078                         $search = $xpath->query("//*[@id='pod_location']", $vcard); // */
1079                         if ($search->length > 0) {
1080                                 $data["baseurl"] = trim($search->item(0)->nodeValue, "/");
1081                         }
1082                 }
1083
1084                 $avatar = [];
1085                 $photos = $xpath->query("//*[contains(concat(' ', @class, ' '), ' photo ') or contains(concat(' ', @class, ' '), ' avatar ')]", $vcard); // */
1086                 foreach ($photos as $photo) {
1087                         $attr = [];
1088                         foreach ($photo->attributes as $attribute) {
1089                                 $attr[$attribute->name] = trim($attribute->value);
1090                         }
1091
1092                         if (isset($attr["src"]) && isset($attr["width"])) {
1093                                 $avatar[$attr["width"]] = $attr["src"];
1094                         }
1095
1096                         // We don't have a width. So we just take everything that we got.
1097                         // This is a Hubzilla workaround which doesn't send a width.
1098                         if ((sizeof($avatar) == 0) && !empty($attr["src"])) {
1099                                 $avatar[] = $attr["src"];
1100                         }
1101                 }
1102
1103                 if (sizeof($avatar)) {
1104                         ksort($avatar);
1105                         $data["photo"] = self::fixAvatar(array_pop($avatar), $data["baseurl"]);
1106                 }
1107
1108                 if ($dfrn) {
1109                         // Poll DFRN specific data
1110                         $search = $xpath->query("//link[contains(concat(' ', @rel), ' dfrn-')]");
1111                         if ($search->length > 0) {
1112                                 foreach ($search as $link) {
1113                                         //$data["request"] = $search->item(0)->nodeValue;
1114                                         $attr = [];
1115                                         foreach ($link->attributes as $attribute) {
1116                                                 $attr[$attribute->name] = trim($attribute->value);
1117                                         }
1118
1119                                         $data[substr($attr["rel"], 5)] = $attr["href"];
1120                                 }
1121                         }
1122
1123                         // Older Friendica versions had used the "uid" field differently than newer versions
1124                         if ($data["nick"] == $data["guid"]) {
1125                                 unset($data["guid"]);
1126                         }
1127                 }
1128
1129
1130                 return $data;
1131         }
1132
1133         /**
1134          * @brief Check for Diaspora contact
1135          *
1136          * @param array $webfinger Webfinger data
1137          *
1138          * @return array Diaspora data
1139          */
1140         private static function diaspora($webfinger)
1141         {
1142                 $hcard_url = "";
1143                 $data = [];
1144                 foreach ($webfinger["links"] as $link) {
1145                         if (($link["rel"] == "http://microformats.org/profile/hcard") && ($link["href"] != "")) {
1146                                 $hcard_url = $link["href"];
1147                         } elseif (($link["rel"] == "http://joindiaspora.com/seed_location") && ($link["href"] != "")) {
1148                                 $data["baseurl"] = trim($link["href"], '/');
1149                         } elseif (($link["rel"] == "http://joindiaspora.com/guid") && ($link["href"] != "")) {
1150                                 $data["guid"] = $link["href"];
1151                         } elseif (($link["rel"] == "http://webfinger.net/rel/profile-page") && ($link["type"] == "text/html") && ($link["href"] != "")) {
1152                                 $data["url"] = $link["href"];
1153                         } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
1154                                 $data["poll"] = $link["href"];
1155                         } elseif (($link["rel"] == NAMESPACE_POCO) && ($link["href"] != "")) {
1156                                 $data["poco"] = $link["href"];
1157                         } elseif (($link["rel"] == "salmon") && ($link["href"] != "")) {
1158                                 $data["notify"] = $link["href"];
1159                         } elseif (($link["rel"] == "diaspora-public-key") && ($link["href"] != "")) {
1160                                 $data["pubkey"] = base64_decode($link["href"]);
1161
1162                                 //if (strstr($data["pubkey"], 'RSA ') || ($link["type"] == "RSA"))
1163                                 if (strstr($data["pubkey"], 'RSA ')) {
1164                                         $data["pubkey"] = Crypto::rsaToPem($data["pubkey"]);
1165                                 }
1166                         }
1167                 }
1168
1169                 if (!isset($data["url"]) || ($hcard_url == "")) {
1170                         return false;
1171                 }
1172
1173                 if (is_array($webfinger["aliases"])) {
1174                         foreach ($webfinger["aliases"] as $alias) {
1175                                 if (normalise_link($alias) != normalise_link($data["url"]) && ! strstr($alias, "@")) {
1176                                         $data["alias"] = $alias;
1177                                 } elseif (substr($alias, 0, 5) == 'acct:') {
1178                                         $data["addr"] = substr($alias, 5);
1179                                 }
1180                         }
1181                 }
1182
1183                 if (!empty($webfinger["subject"]) && (substr($webfinger["subject"], 0, 5) == 'acct:')) {
1184                         $data["addr"] = substr($webfinger["subject"], 5);
1185                 }
1186
1187                 // Fetch further information from the hcard
1188                 $data = self::pollHcard($hcard_url, $data);
1189
1190                 if (!$data) {
1191                         return false;
1192                 }
1193
1194                 if (isset($data["url"])
1195                         && isset($data["guid"])
1196                         && isset($data["baseurl"])
1197                         && isset($data["pubkey"])
1198                         && ($hcard_url != "")
1199                 ) {
1200                         $data["network"] = NETWORK_DIASPORA;
1201
1202                         // The Diaspora handle must always be lowercase
1203                         $data["addr"] = strtolower($data["addr"]);
1204
1205                         // We have to overwrite the detected value for "notify" since Hubzilla doesn't send it
1206                         $data["notify"] = $data["baseurl"] . "/receive/users/" . $data["guid"];
1207                         $data["batch"]  = $data["baseurl"] . "/receive/public";
1208                 } else {
1209                         return false;
1210                 }
1211
1212                 return $data;
1213         }
1214
1215         /**
1216          * @brief Check for OStatus contact
1217          *
1218          * @param array $webfinger Webfinger data
1219          * @param bool  $short     Short detection mode
1220          *
1221          * @return array|bool OStatus data or "false" on error or "true" on short mode
1222          */
1223         private static function ostatus($webfinger, $short = false)
1224         {
1225                 $data = [];
1226
1227                 if (is_array($webfinger["aliases"])) {
1228                         foreach ($webfinger["aliases"] as $alias) {
1229                                 if (strstr($alias, "@") && !strstr(normalise_link($alias), "http://")) {
1230                                         $data["addr"] = str_replace('acct:', '', $alias);
1231                                 }
1232                         }
1233                 }
1234
1235                 if (is_string($webfinger["subject"]) && strstr($webfinger["subject"], "@")
1236                         && !strstr(normalise_link($webfinger["subject"]), "http://")
1237                 ) {
1238                         $data["addr"] = str_replace('acct:', '', $webfinger["subject"]);
1239                 }
1240
1241                 $pubkey = "";
1242                 if (is_array($webfinger["links"])) {
1243                         foreach ($webfinger["links"] as $link) {
1244                                 if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1245                                         && ($link["type"] == "text/html")
1246                                         && ($link["href"] != "")
1247                                 ) {
1248                                         $data["url"] = $link["href"];
1249                                 } elseif (($link["rel"] == "salmon") && ($link["href"] != "")) {
1250                                         $data["notify"] = $link["href"];
1251                                 } elseif (($link["rel"] == NAMESPACE_FEED) && ($link["href"] != "")) {
1252                                         $data["poll"] = $link["href"];
1253                                 } elseif (($link["rel"] == "magic-public-key") && ($link["href"] != "")) {
1254                                         $pubkey = $link["href"];
1255
1256                                         if (substr($pubkey, 0, 5) === 'data:') {
1257                                                 if (strstr($pubkey, ',')) {
1258                                                         $pubkey = substr($pubkey, strpos($pubkey, ',') + 1);
1259                                                 } else {
1260                                                         $pubkey = substr($pubkey, 5);
1261                                                 }
1262                                         } elseif (normalise_link($pubkey) == 'http://') {
1263                                                 $ret = Network::curl($pubkey);
1264                                                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1265                                                         return false;
1266                                                 }
1267                                                 $pubkey = $ret['body'];
1268                                         }
1269
1270                                         $key = explode(".", $pubkey);
1271
1272                                         if (sizeof($key) >= 3) {
1273                                                 $m = base64url_decode($key[1]);
1274                                                 $e = base64url_decode($key[2]);
1275                                                 $data["pubkey"] = Crypto::meToPem($m, $e);
1276                                         }
1277                                 }
1278                         }
1279                 }
1280
1281                 if (isset($data["notify"]) && isset($data["pubkey"])
1282                         && isset($data["poll"])
1283                         && isset($data["url"])
1284                 ) {
1285                         $data["network"] = NETWORK_OSTATUS;
1286                 } else {
1287                         return false;
1288                 }
1289
1290                 if ($short) {
1291                         return true;
1292                 }
1293
1294                 // Fetch all additional data from the feed
1295                 $ret = Network::curl($data["poll"]);
1296                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1297                         return false;
1298                 }
1299                 $feed = $ret['body'];
1300                 $feed_data = Feed::import($feed, $dummy1, $dummy2, $dummy3, true);
1301                 if (!$feed_data) {
1302                         return false;
1303                 }
1304
1305                 if ($feed_data["header"]["author-name"] != "") {
1306                         $data["name"] = $feed_data["header"]["author-name"];
1307                 }
1308                 if ($feed_data["header"]["author-nick"] != "") {
1309                         $data["nick"] = $feed_data["header"]["author-nick"];
1310                 }
1311                 if ($feed_data["header"]["author-avatar"] != "") {
1312                         $data["photo"] = self::fixAvatar($feed_data["header"]["author-avatar"], $data["url"]);
1313                 }
1314                 if ($feed_data["header"]["author-id"] != "") {
1315                         $data["alias"] = $feed_data["header"]["author-id"];
1316                 }
1317                 if ($feed_data["header"]["author-location"] != "") {
1318                         $data["location"] = $feed_data["header"]["author-location"];
1319                 }
1320                 if ($feed_data["header"]["author-about"] != "") {
1321                         $data["about"] = $feed_data["header"]["author-about"];
1322                 }
1323                 // OStatus has serious issues when the the url doesn't fit (ssl vs. non ssl)
1324                 // So we take the value that we just fetched, although the other one worked as well
1325                 if ($feed_data["header"]["author-link"] != "") {
1326                         $data["url"] = $feed_data["header"]["author-link"];
1327                 }
1328
1329                 if (($data['poll'] == $data['url']) && ($data["alias"] != '')) {
1330                         $data['url'] = $data["alias"];
1331                         $data["alias"] = '';
1332                 }
1333
1334                 /// @todo Fetch location and "about" from the feed as well
1335                 return $data;
1336         }
1337
1338         /**
1339          * @brief Fetch data from a pump.io profile page
1340          *
1341          * @param string $profile_link Link to the profile page
1342          *
1343          * @return array profile data
1344          */
1345         private static function pumpioProfileData($profile_link)
1346         {
1347                 $doc = new DOMDocument();
1348                 if (!@$doc->loadHTMLFile($profile_link)) {
1349                         return false;
1350                 }
1351
1352                 $xpath = new DomXPath($doc);
1353
1354                 $data = [];
1355
1356                 $data["name"] = $xpath->query("//span[contains(@class, 'p-name')]")->item(0)->nodeValue;
1357
1358                 if ($data["name"] == '') {
1359                         // This is ugly - but pump.io doesn't seem to know a better way for it
1360                         $data["name"] = trim($xpath->query("//h1[@class='media-header']")->item(0)->nodeValue);
1361                         $pos = strpos($data["name"], chr(10));
1362                         if ($pos) {
1363                                 $data["name"] = trim(substr($data["name"], 0, $pos));
1364                         }
1365                 }
1366
1367                 $data["location"] = $xpath->query("//p[contains(@class, 'p-locality')]")->item(0)->nodeValue;
1368
1369                 if ($data["location"] == '') {
1370                         $data["location"] = $xpath->query("//p[contains(@class, 'location')]")->item(0)->nodeValue;
1371                 }
1372
1373                 $data["about"] = $xpath->query("//p[contains(@class, 'p-note')]")->item(0)->nodeValue;
1374
1375                 if ($data["about"] == '') {
1376                         $data["about"] = $xpath->query("//p[contains(@class, 'summary')]")->item(0)->nodeValue;
1377                 }
1378
1379                 $avatar = $xpath->query("//img[contains(@class, 'u-photo')]")->item(0);
1380                 if (!$avatar) {
1381                         $avatar = $xpath->query("//img[@class='img-rounded media-object']")->item(0);
1382                 }
1383                 if ($avatar) {
1384                         foreach ($avatar->attributes as $attribute) {
1385                                 if ($attribute->name == "src") {
1386                                         $data["photo"] = trim($attribute->value);
1387                                 }
1388                         }
1389                 }
1390
1391                 return $data;
1392         }
1393
1394         /**
1395          * @brief Check for pump.io contact
1396          *
1397          * @param array $webfinger Webfinger data
1398          *
1399          * @return array pump.io data
1400          */
1401         private static function pumpio($webfinger, $addr)
1402         {
1403                 $data = [];
1404                 foreach ($webfinger["links"] as $link) {
1405                         if (($link["rel"] == "http://webfinger.net/rel/profile-page")
1406                                 && ($link["type"] == "text/html")
1407                                 && ($link["href"] != "")
1408                         ) {
1409                                 $data["url"] = $link["href"];
1410                         } elseif (($link["rel"] == "activity-inbox") && ($link["href"] != "")) {
1411                                 $data["notify"] = $link["href"];
1412                         } elseif (($link["rel"] == "activity-outbox") && ($link["href"] != "")) {
1413                                 $data["poll"] = $link["href"];
1414                         } elseif (($link["rel"] == "dialback") && ($link["href"] != "")) {
1415                                 $data["dialback"] = $link["href"];
1416                         }
1417                 }
1418                 if (isset($data["poll"]) && isset($data["notify"])
1419                         && isset($data["dialback"])
1420                         && isset($data["url"])
1421                 ) {
1422                         // by now we use these fields only for the network type detection
1423                         // So we unset all data that isn't used at the moment
1424                         unset($data["dialback"]);
1425
1426                         $data["network"] = NETWORK_PUMPIO;
1427                 } else {
1428                         return false;
1429                 }
1430
1431                 $profile_data = self::pumpioProfileData($data["url"]);
1432
1433                 if (!$profile_data) {
1434                         return false;
1435                 }
1436
1437                 $data = array_merge($data, $profile_data);
1438
1439                 if (($addr != '') && ($data['name'] != '')) {
1440                         $name = trim(str_replace($addr, '', $data['name']));
1441                         if ($name != '') {
1442                                 $data['name'] = $name;
1443                         }
1444                 }
1445
1446                 return $data;
1447         }
1448
1449         /**
1450          * @brief Check page for feed link
1451          *
1452          * @param string $url Page link
1453          *
1454          * @return string feed link
1455          */
1456         private static function getFeedLink($url)
1457         {
1458                 $doc = new DOMDocument();
1459
1460                 if (!@$doc->loadHTMLFile($url)) {
1461                         return false;
1462                 }
1463
1464                 $xpath = new DomXPath($doc);
1465
1466                 //$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
1467                 $feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
1468                 if (!is_object($feeds)) {
1469                         return false;
1470                 }
1471
1472                 if ($feeds->length == 0) {
1473                         return false;
1474                 }
1475
1476                 $feed_url = "";
1477
1478                 foreach ($feeds as $feed) {
1479                         $attr = [];
1480                         foreach ($feed->attributes as $attribute) {
1481                                 $attr[$attribute->name] = trim($attribute->value);
1482                         }
1483
1484                         if ($feed_url == "") {
1485                                 $feed_url = $attr["href"];
1486                         }
1487                 }
1488
1489                 return $feed_url;
1490         }
1491
1492         /**
1493          * @brief Check for feed contact
1494          *
1495          * @param string  $url   Profile link
1496          * @param boolean $probe Do a probe if the page contains a feed link
1497          *
1498          * @return array feed data
1499          */
1500         private static function feed($url, $probe = true)
1501         {
1502                 $ret = Network::curl($url);
1503                 if ($ret['errno'] == CURLE_OPERATION_TIMEDOUT) {
1504                         return false;
1505                 }
1506                 $feed = $ret['body'];
1507                 $feed_data = Feed::import($feed, $dummy1, $dummy2, $dummy3, true);
1508
1509                 if (!$feed_data) {
1510                         if (!$probe) {
1511                                 return false;
1512                         }
1513
1514                         $feed_url = self::getFeedLink($url);
1515
1516                         if (!$feed_url) {
1517                                 return false;
1518                         }
1519
1520                         return self::feed($feed_url, false);
1521                 }
1522
1523                 if ($feed_data["header"]["author-name"] != "") {
1524                         $data["name"] = $feed_data["header"]["author-name"];
1525                 }
1526
1527                 if ($feed_data["header"]["author-nick"] != "") {
1528                         $data["nick"] = $feed_data["header"]["author-nick"];
1529                 }
1530
1531                 if ($feed_data["header"]["author-avatar"] != "") {
1532                         $data["photo"] = $feed_data["header"]["author-avatar"];
1533                 }
1534
1535                 if ($feed_data["header"]["author-id"] != "") {
1536                         $data["alias"] = $feed_data["header"]["author-id"];
1537                 }
1538
1539                 $data["url"] = $url;
1540                 $data["poll"] = $url;
1541
1542                 if ($feed_data["header"]["author-link"] != "") {
1543                         $data["baseurl"] = $feed_data["header"]["author-link"];
1544                 } else {
1545                         $data["baseurl"] = $data["url"];
1546                 }
1547
1548                 $data["network"] = NETWORK_FEED;
1549
1550                 return $data;
1551         }
1552
1553         /**
1554          * @brief Check for mail contact
1555          *
1556          * @param string  $uri Profile link
1557          * @param integer $uid User ID
1558          *
1559          * @return array mail data
1560          */
1561         private static function mail($uri, $uid)
1562         {
1563                 if (!Network::isEmailDomainValid($uri)) {
1564                         return false;
1565                 }
1566
1567                 if ($uid == 0) {
1568                         return false;
1569                 }
1570
1571                 $x = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1", intval($uid));
1572
1573                 $r = q("SELECT * FROM `mailacct` WHERE `uid` = %d AND `server` != '' LIMIT 1", intval($uid));
1574
1575                 if (DBM::is_result($x) && DBM::is_result($r)) {
1576                         $mailbox = Email::constructMailboxName($r[0]);
1577                         $password = '';
1578                         openssl_private_decrypt(hex2bin($r[0]['pass']), $password, $x[0]['prvkey']);
1579                         $mbox = Email::connect($mailbox, $r[0]['user'], $password);
1580                         if (!$mbox) {
1581                                 return false;
1582                         }
1583                 }
1584
1585                 $msgs = Email::poll($mbox, $uri);
1586                 logger('searching '.$uri.', '.count($msgs).' messages found.', LOGGER_DEBUG);
1587
1588                 if (!count($msgs)) {
1589                         return false;
1590                 }
1591
1592                 $phost = substr($uri, strpos($uri, '@') + 1);
1593
1594                 $data = [];
1595                 $data["addr"]    = $uri;
1596                 $data["network"] = NETWORK_MAIL;
1597                 $data["name"]    = substr($uri, 0, strpos($uri, '@'));
1598                 $data["nick"]    = $data["name"];
1599                 $data["photo"]   = Network::lookupAvatarByEmail($uri);
1600                 $data["url"]     = 'mailto:'.$uri;
1601                 $data["notify"]  = 'smtp '.random_string();
1602                 $data["poll"]    = 'email '.random_string();
1603
1604                 $x = Email::messageMeta($mbox, $msgs[0]);
1605                 if (stristr($x[0]->from, $uri)) {
1606                         $adr = imap_rfc822_parse_adrlist($x[0]->from, '');
1607                 } elseif (stristr($x[0]->to, $uri)) {
1608                         $adr = imap_rfc822_parse_adrlist($x[0]->to, '');
1609                 }
1610                 if (isset($adr)) {
1611                         foreach ($adr as $feadr) {
1612                                 if ((strcasecmp($feadr->mailbox, $data["name"]) == 0)
1613                                         &&(strcasecmp($feadr->host, $phost) == 0)
1614                                         && (strlen($feadr->personal))
1615                                 ) {
1616                                         $personal = imap_mime_header_decode($feadr->personal);
1617                                         $data["name"] = "";
1618                                         foreach ($personal as $perspart) {
1619                                                 if ($perspart->charset != "default") {
1620                                                         $data["name"] .= iconv($perspart->charset, 'UTF-8//IGNORE', $perspart->text);
1621                                                 } else {
1622                                                         $data["name"] .= $perspart->text;
1623                                                 }
1624                                         }
1625
1626                                         $data["name"] = notags($data["name"]);
1627                                 }
1628                         }
1629                 }
1630                 if (!empty($mbox)) {
1631                         imap_close($mbox);
1632                 }
1633
1634                 return $data;
1635         }
1636
1637         /**
1638          * @brief Mix two paths together to possibly fix missing parts
1639          *
1640          * @param string $avatar Path to the avatar
1641          * @param string $base   Another path that is hopefully complete
1642          *
1643          * @return string fixed avatar path
1644          */
1645         public static function fixAvatar($avatar, $base)
1646         {
1647                 $base_parts = parse_url($base);
1648
1649                 // Remove all parts that could create a problem
1650                 unset($base_parts['path']);
1651                 unset($base_parts['query']);
1652                 unset($base_parts['fragment']);
1653
1654                 $avatar_parts = parse_url($avatar);
1655
1656                 // Now we mix them
1657                 $parts = array_merge($base_parts, $avatar_parts);
1658
1659                 // And put them together again
1660                 $scheme   = isset($parts['scheme'])   ? $parts['scheme'] . '://' : '';
1661                 $host     = isset($parts['host'])     ? $parts['host']           : '';
1662                 $port     = isset($parts['port'])     ? ':' . $parts['port']     : '';
1663                 $path     = isset($parts['path'])     ? $parts['path']           : '';
1664                 $query    = isset($parts['query'])    ? '?' . $parts['query']    : '';
1665                 $fragment = isset($parts['fragment']) ? '#' . $parts['fragment'] : '';
1666
1667                 $fixed = $scheme.$host.$port.$path.$query.$fragment;
1668
1669                 logger('Base: '.$base.' - Avatar: '.$avatar.' - Fixed: '.$fixed, LOGGER_DATA);
1670
1671                 return $fixed;
1672         }
1673 }