src/Util/Network.php

   1 <?php
   2 /**
   3  * @file src/Util/Network.php
   4  */
   5 namespace Friendica\Util;
   6
   7 use Friendica\App;
   8 use Friendica\Core\Addon;
   9 use Friendica\Core\L10n;
  10 use Friendica\Core\System;
  11 use Friendica\Core\Config;
  12 use Friendica\Network\Curl;
  13 use Friendica\Network\HTTPException\InternalServerErrorException;
  14 use Friendica\Network\Probe;
  15 use Friendica\Object\Image;
  16 use Friendica\Util\XML;
  17 use DOMDocument;
  18 use DomXPath;
  19
  20 class Network
  21 {
  22         /**
  23          * @var Curl The latest Curl output
  24          */
  25         private static $curl;
  26
  27         /**
  28          * Returns the latest Curl output
  29          *
  30          * @return Curl The latest Curl output
  31          */
  32         public static function getCurl()
  33         {
  34                 if (empty(self::$curl)) {
  35                         self::$curl = new Curl();
  36                 }
  37
  38                 return self::$curl;
  39         }
  40
  41         /**
  42          * Curl wrapper
  43          *
  44          * If binary flag is true, return binary results.
  45          * Set the cookiejar argument to a string (e.g. "/tmp/friendica-cookies.txt")
  46          * to preserve cookies from one request to the next.
  47          *
  48          * @brief Curl wrapper
  49          * @param string  $url            URL to fetch
  50          * @param boolean $binary         default false
  51          *                                TRUE if asked to return binary results (file download)
  52          * @param integer $redirects      The recursion counter for internal use - default 0
  53          * @param integer $timeout        Timeout in seconds, default system config value or 60 seconds
  54          * @param string  $accept_content supply Accept: header with 'accept_content' as the value
  55          * @param string  $cookiejar      Path to cookie jar file
  56          *
  57          * @return string The fetched content
  58          */
  59         public static function fetchUrl($url, $binary = false, &$redirects = 0, $timeout = 0, $accept_content = null, $cookiejar = '')
  60         {
  61                 $ret = self::fetchUrlFull($url, $binary, $redirects, $timeout, $accept_content, $cookiejar);
  62
  63                 return $ret['body'];
  64         }
  65
  66         /**
  67          * Curl wrapper with array of return values.
  68          *
  69          * Inner workings and parameters are the same as @ref fetchUrl but returns an array with
  70          * all the information collected during the fetch.
  71          *
  72          * @brief Curl wrapper with array of return values.
  73          * @param string  $url            URL to fetch
  74          * @param boolean $binary         default false
  75          *                                TRUE if asked to return binary results (file download)
  76          * @param integer $redirects      The recursion counter for internal use - default 0
  77          * @param integer $timeout        Timeout in seconds, default system config value or 60 seconds
  78          * @param string  $accept_content supply Accept: header with 'accept_content' as the value
  79          * @param string  $cookiejar      Path to cookie jar file
  80          *
  81          * @return array With all relevant information, 'body' contains the actual fetched content.
  82          */
  83         public static function fetchUrlFull($url, $binary = false, &$redirects = 0, $timeout = 0, $accept_content = null, $cookiejar = '')
  84         {
  85                 return self::curl(
  86                         $url,
  87                         $binary,
  88                         $redirects,
  89                         ['timeout'=>$timeout,
  90                         'accept_content'=>$accept_content,
  91                         'cookiejar'=>$cookiejar
  92                         ]
  93                 );
  94         }
  95
  96         /**
  97          * @brief fetches an URL.
  98          *
  99          * @param string  $url       URL to fetch
 100          * @param boolean $binary    default false
 101          *                           TRUE if asked to return binary results (file download)
 102          * @param int     $redirects The recursion counter for internal use - default 0
 103          * @param array   $opts      (optional parameters) assoziative array with:
 104          *                           'accept_content' => supply Accept: header with 'accept_content' as the value
 105          *                           'timeout' => int Timeout in seconds, default system config value or 60 seconds
 106          *                           'http_auth' => username:password
 107          *                           'novalidate' => do not validate SSL certs, default is to validate using our CA list
 108          *                           'nobody' => only return the header
 109          *                           'cookiejar' => path to cookie jar file
 110          *
 111          * @return array an assoziative array with:
 112          *    int 'return_code' => HTTP return code or 0 if timeout or failure
 113          *    boolean 'success' => boolean true (if HTTP 2xx result) or false
 114          *    string 'redirect_url' => in case of redirect, content was finally retrieved from this URL
 115          *    string 'header' => HTTP headers
 116          *    string 'body' => fetched content
 117          */
 118         public static function curl($url, $binary = false, &$redirects = 0, $opts = [])
 119         {
 120                 $ret = ['return_code' => 0, 'success' => false, 'header' => '', 'info' => '', 'body' => ''];
 121
 122                 $stamp1 = microtime(true);
 123
 124                 $a = get_app();
 125
 126                 $parts = parse_url($url);
 127                 $path_parts = explode('/', defaults($parts, 'path', ''));
 128                 foreach ($path_parts as $part) {
 129                         if (strlen($part) <> mb_strlen($part)) {
 130                                 $parts2[] = rawurlencode($part);
 131                         } else {
 132                                 $parts2[] = $part;
 133                         }
 134                 }
 135                 $parts['path'] =  implode('/', $parts2);
 136                 $url = self::unparseURL($parts);
 137
 138                 if (self::isUrlBlocked($url)) {
 139                         logger('domain of ' . $url . ' is blocked', LOGGER_DATA);
 140                         return $ret;
 141                 }
 142
 143                 $ch = @curl_init($url);
 144
 145                 if (($redirects > 8) || (!$ch)) {
 146                         return $ret;
 147                 }
 148
 149                 @curl_setopt($ch, CURLOPT_HEADER, true);
 150
 151                 if (x($opts, "cookiejar")) {
 152                         curl_setopt($ch, CURLOPT_COOKIEJAR, $opts["cookiejar"]);
 153                         curl_setopt($ch, CURLOPT_COOKIEFILE, $opts["cookiejar"]);
 154                 }
 155
 156                 // These settings aren't needed. We're following the location already.
 157                 //      @curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 158                 //      @curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
 159
 160                 if (x($opts, 'accept_content')) {
 161                         curl_setopt(
 162                                 $ch,
 163                                 CURLOPT_HTTPHEADER,
 164                                 ['Accept: ' . $opts['accept_content']]
 165                         );
 166                 }
 167
 168                 @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 169                 @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 170
 171                 $range = intval(Config::get('system', 'curl_range_bytes', 0));
 172
 173                 if ($range > 0) {
 174                         @curl_setopt($ch, CURLOPT_RANGE, '0-' . $range);
 175                 }
 176
 177                 // Without this setting it seems as if some webservers send compressed content
 178                 // This seems to confuse curl so that it shows this uncompressed.
 179                 /// @todo  We could possibly set this value to "gzip" or something similar
 180                 curl_setopt($ch, CURLOPT_ENCODING, '');
 181
 182                 if (x($opts, 'headers')) {
 183                         @curl_setopt($ch, CURLOPT_HTTPHEADER, $opts['headers']);
 184                 }
 185
 186                 if (x($opts, 'nobody')) {
 187                         @curl_setopt($ch, CURLOPT_NOBODY, $opts['nobody']);
 188                 }
 189
 190                 if (x($opts, 'timeout')) {
 191                         @curl_setopt($ch, CURLOPT_TIMEOUT, $opts['timeout']);
 192                 } else {
 193                         $curl_time = Config::get('system', 'curl_timeout', 60);
 194                         @curl_setopt($ch, CURLOPT_TIMEOUT, intval($curl_time));
 195                 }
 196
 197                 // by default we will allow self-signed certs
 198                 // but you can override this
 199
 200                 $check_cert = Config::get('system', 'verifyssl');
 201                 @curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
 202
 203                 if ($check_cert) {
 204                         @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
 205                 }
 206
 207                 $proxy = Config::get('system', 'proxy');
 208
 209                 if (strlen($proxy)) {
 210                         @curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
 211                         @curl_setopt($ch, CURLOPT_PROXY, $proxy);
 212                         $proxyuser = @Config::get('system', 'proxyuser');
 213
 214                         if (strlen($proxyuser)) {
 215                                 @curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyuser);
 216                         }
 217                 }
 218
 219                 if (Config::get('system', 'ipv4_resolve', false)) {
 220                         curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 221                 }
 222
 223                 if ($binary) {
 224                         @curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
 225                 }
 226
 227                 // don't let curl abort the entire application
 228                 // if it throws any errors.
 229
 230                 $s = @curl_exec($ch);
 231                 $curl_info = @curl_getinfo($ch);
 232
 233                 // Special treatment for HTTP Code 416
 234                 // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/416
 235                 if (($curl_info['http_code'] == 416) && ($range > 0)) {
 236                         @curl_setopt($ch, CURLOPT_RANGE, '');
 237                         $s = @curl_exec($ch);
 238                         $curl_info = @curl_getinfo($ch);
 239                 }
 240
 241                 if (curl_errno($ch) !== CURLE_OK) {
 242                         logger('error fetching ' . $url . ': ' . curl_error($ch), LOGGER_INFO);
 243                 }
 244
 245                 $ret['errno'] = curl_errno($ch);
 246
 247                 $base = $s;
 248                 $ret['info'] = $curl_info;
 249
 250                 $http_code = $curl_info['http_code'];
 251
 252                 logger($url . ': ' . $http_code . " " . $s, LOGGER_DATA);
 253                 $header = '';
 254
 255                 // Pull out multiple headers, e.g. proxy and continuation headers
 256                 // allow for HTTP/2.x without fixing code
 257
 258                 while (preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/', $base)) {
 259                         $chunk = substr($base, 0, strpos($base, "\r\n\r\n") + 4);
 260                         $header .= $chunk;
 261                         $base = substr($base, strlen($chunk));
 262                 }
 263
 264                 self::$curl = new Curl($http_code, (isset($curl_info['content_type']) ? $curl_info['content_type'] : ''), $header);
 265
 266                 if ($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307) {
 267                         $new_location_info = @parse_url($curl_info['redirect_url']);
 268                         $old_location_info = @parse_url($curl_info['url']);
 269
 270                         $newurl = $curl_info['redirect_url'];
 271
 272                         if (empty($new_location_info['path']) && !empty($new_location_info['host'])) {
 273                                 $newurl = $new_location_info['scheme'] . '://' . $new_location_info['host'] . $old_location_info['path'];
 274                         }
 275
 276                         $matches = [];
 277
 278                         if (preg_match('/(Location:|URI:)(.*?)\n/i', $header, $matches)) {
 279                                 $newurl = trim(array_pop($matches));
 280                         }
 281                         if (strpos($newurl, '/') === 0) {
 282                                 $newurl = $old_location_info["scheme"]."://".$old_location_info["host"].$newurl;
 283                         }
 284                         $old_location_query = @parse_url($url, PHP_URL_QUERY);
 285
 286                         if ($old_location_query != '') {
 287                                 $newurl .= '?' . $old_location_query;
 288                         }
 289
 290                         if (filter_var($newurl, FILTER_VALIDATE_URL)) {
 291                                 $redirects++;
 292                                 @curl_close($ch);
 293                                 return self::curl($newurl, $binary, $redirects, $opts);
 294                         }
 295                 }
 296
 297                 self::$curl->setCode($http_code);
 298                 if (isset($curl_info['content_type'])) {
 299                         self::$curl->setContentType($curl_info['content_type']);
 300                 }
 301
 302                 $rc = intval($http_code);
 303                 $ret['return_code'] = $rc;
 304                 $ret['success'] = (($rc >= 200 && $rc <= 299) ? true : false);
 305                 $ret['redirect_url'] = $url;
 306
 307                 if (!$ret['success']) {
 308                         $ret['error'] = curl_error($ch);
 309                         $ret['debug'] = $curl_info;
 310                         logger('error: '.$url.': '.$ret['return_code'].' - '.$ret['error'], LOGGER_DEBUG);
 311                         logger('debug: '.print_r($curl_info, true), LOGGER_DATA);
 312                 }
 313
 314                 $ret['body'] = substr($s, strlen($header));
 315                 $ret['header'] = $header;
 316
 317                 if (x($opts, 'debug')) {
 318                         $ret['debug'] = $curl_info;
 319                 }
 320
 321                 @curl_close($ch);
 322
 323                 $a->saveTimestamp($stamp1, 'network');
 324
 325                 return($ret);
 326         }
 327
 328         /**
 329          * @brief Send POST request to $url
 330          *
 331          * @param string  $url       URL to post
 332          * @param mixed   $params    array of POST variables
 333          * @param string  $headers   HTTP headers
 334          * @param integer $redirects Recursion counter for internal use - default = 0
 335          * @param integer $timeout   The timeout in seconds, default system config value or 60 seconds
 336          *
 337          * @return string The content
 338          */
 339         public static function post($url, $params, $headers = null, &$redirects = 0, $timeout = 0)
 340         {
 341                 $stamp1 = microtime(true);
 342
 343                 if (self::isUrlBlocked($url)) {
 344                         logger('post_url: domain of ' . $url . ' is blocked', LOGGER_DATA);
 345                         return false;
 346                 }
 347
 348                 $a = get_app();
 349                 $ch = curl_init($url);
 350
 351                 if (($redirects > 8) || (!$ch)) {
 352                         return false;
 353                 }
 354
 355                 logger('post_url: start ' . $url, LOGGER_DATA);
 356
 357                 curl_setopt($ch, CURLOPT_HEADER, true);
 358                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 359                 curl_setopt($ch, CURLOPT_POST, 1);
 360                 curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
 361                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 362
 363                 if (Config::get('system', 'ipv4_resolve', false)) {
 364                         curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 365                 }
 366
 367                 if (intval($timeout)) {
 368                         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
 369                 } else {
 370                         $curl_time = Config::get('system', 'curl_timeout', 60);
 371                         curl_setopt($ch, CURLOPT_TIMEOUT, intval($curl_time));
 372                 }
 373
 374                 if (defined('LIGHTTPD')) {
 375                         if (!is_array($headers)) {
 376                                 $headers = ['Expect:'];
 377                         } else {
 378                                 if (!in_array('Expect:', $headers)) {
 379                                         array_push($headers, 'Expect:');
 380                                 }
 381                         }
 382                 }
 383
 384                 if ($headers) {
 385                         curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 386                 }
 387
 388                 $check_cert = Config::get('system', 'verifyssl');
 389                 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
 390
 391                 if ($check_cert) {
 392                         @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
 393                 }
 394
 395                 $proxy = Config::get('system', 'proxy');
 396
 397                 if (strlen($proxy)) {
 398                         curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
 399                         curl_setopt($ch, CURLOPT_PROXY, $proxy);
 400                         $proxyuser = Config::get('system', 'proxyuser');
 401                         if (strlen($proxyuser)) {
 402                                 curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyuser);
 403                         }
 404                 }
 405
 406                 self::getCurl()->setCode(0);
 407
 408                 // don't let curl abort the entire application
 409                 // if it throws any errors.
 410
 411                 $s = @curl_exec($ch);
 412
 413                 $base = $s;
 414                 $curl_info = curl_getinfo($ch);
 415                 $http_code = $curl_info['http_code'];
 416
 417                 logger('post_url: result ' . $http_code . ' - ' . $url, LOGGER_DATA);
 418
 419                 $header = '';
 420
 421                 // Pull out multiple headers, e.g. proxy and continuation headers
 422                 // allow for HTTP/2.x without fixing code
 423
 424                 while (preg_match('/^HTTP\/[1-2].+? [1-5][0-9][0-9]/', $base)) {
 425                         $chunk = substr($base, 0, strpos($base, "\r\n\r\n") + 4);
 426                         $header .= $chunk;
 427                         $base = substr($base, strlen($chunk));
 428                 }
 429
 430                 if ($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307) {
 431                         $matches = [];
 432                         $new_location_info = @parse_url($curl_info['redirect_url']);
 433                         $old_location_info = @parse_url($curl_info['url']);
 434
 435                         preg_match('/(Location:|URI:)(.*?)\n/', $header, $matches);
 436                         $newurl = trim(array_pop($matches));
 437
 438                         if (strpos($newurl, '/') === 0) {
 439                                 $newurl = $old_location_info["scheme"] . "://" . $old_location_info["host"] . $newurl;
 440                         }
 441
 442                         if (filter_var($newurl, FILTER_VALIDATE_URL)) {
 443                                 $redirects++;
 444                                 logger('post_url: redirect ' . $url . ' to ' . $newurl);
 445                                 return self::post($newurl, $params, $headers, $redirects, $timeout);
 446                         }
 447                 }
 448
 449                 self::getCurl()->setCode($http_code);
 450
 451                 $body = substr($s, strlen($header));
 452
 453                 self::getCurl()->setHeaders($header);
 454
 455                 curl_close($ch);
 456
 457                 $a->saveTimestamp($stamp1, 'network');
 458
 459                 logger('post_url: end ' . $url, LOGGER_DATA);
 460
 461                 return $body;
 462         }
 463
 464         /**
 465          * @brief Check URL to see if it's real
 466          *
 467          * Take a URL from the wild, prepend http:// if necessary
 468          * and check DNS to see if it's real (or check if is a valid IP address)
 469          *
 470          * @param string $url The URL to be validated
 471          * @return string|boolean The actual working URL, false else
 472          */
 473         public static function isUrlValid($url)
 474         {
 475                 if (Config::get('system', 'disable_url_validation')) {
 476                         return $url;
 477                 }
 478
 479                 // no naked subdomains (allow localhost for tests)
 480                 if (strpos($url, '.') === false && strpos($url, '/localhost/') === false) {
 481                         return false;
 482                 }
 483
 484                 if (substr($url, 0, 4) != 'http') {
 485                         $url = 'http://' . $url;
 486                 }
 487
 488                 /// @TODO Really suppress function outcomes? Why not find them + debug them?
 489                 $h = @parse_url($url);
 490
 491                 if ((is_array($h)) && (@dns_get_record($h['host'], DNS_A + DNS_CNAME) || filter_var($h['host'], FILTER_VALIDATE_IP) )) {
 492                         return $url;
 493                 }
 494
 495                 return false;
 496         }
 497
 498         /**
 499          * @brief Checks that email is an actual resolvable internet address
 500          *
 501          * @param string $addr The email address
 502          * @return boolean True if it's a valid email address, false if it's not
 503          */
 504         public static function isEmailDomainValid($addr)
 505         {
 506                 if (Config::get('system', 'disable_email_validation')) {
 507                         return true;
 508                 }
 509
 510                 if (! strpos($addr, '@')) {
 511                         return false;
 512                 }
 513
 514                 $h = substr($addr, strpos($addr, '@') + 1);
 515
 516                 // Concerning the @ see here: https://stackoverflow.com/questions/36280957/dns-get-record-a-temporary-server-error-occurred
 517                 if ($h && (@dns_get_record($h, DNS_A + DNS_MX) || filter_var($h, FILTER_VALIDATE_IP) )) {
 518                         return true;
 519                 }
 520                 if ($h && @dns_get_record($h, DNS_CNAME + DNS_MX)) {
 521                         return true;
 522                 }
 523                 return false;
 524         }
 525
 526         /**
 527          * @brief Check if URL is allowed
 528          *
 529          * Check $url against our list of allowed sites,
 530          * wildcards allowed. If allowed_sites is unset return true;
 531          *
 532          * @param string $url URL which get tested
 533          * @return boolean True if url is allowed otherwise return false
 534          */
 535         public static function isUrlAllowed($url)
 536         {
 537                 $h = @parse_url($url);
 538
 539                 if (! $h) {
 540                         return false;
 541                 }
 542
 543                 $str_allowed = Config::get('system', 'allowed_sites');
 544                 if (! $str_allowed) {
 545                         return true;
 546                 }
 547
 548                 $found = false;
 549
 550                 $host = strtolower($h['host']);
 551
 552                 // always allow our own site
 553                 if ($host == strtolower($_SERVER['SERVER_NAME'])) {
 554                         return true;
 555                 }
 556
 557                 $fnmatch = function_exists('fnmatch');
 558                 $allowed = explode(',', $str_allowed);
 559
 560                 if (count($allowed)) {
 561                         foreach ($allowed as $a) {
 562                                 $pat = strtolower(trim($a));
 563                                 if (($fnmatch && fnmatch($pat, $host)) || ($pat == $host)) {
 564                                         $found = true;
 565                                         break;
 566                                 }
 567                         }
 568                 }
 569                 return $found;
 570         }
 571
 572         /**
 573          * Checks if the provided url domain is on the domain blocklist.
 574          * Returns true if it is or malformed URL, false if not.
 575          *
 576          * @param string $url The url to check the domain from
 577          *
 578          * @return boolean
 579          */
 580         public static function isUrlBlocked($url)
 581         {
 582                 $host = @parse_url($url, PHP_URL_HOST);
 583                 if (!$host) {
 584                         return false;
 585                 }
 586
 587                 $domain_blocklist = Config::get('system', 'blocklist', []);
 588                 if (!$domain_blocklist) {
 589                         return false;
 590                 }
 591
 592                 foreach ($domain_blocklist as $domain_block) {
 593                         if (strcasecmp($domain_block['domain'], $host) === 0) {
 594                                 return true;
 595                         }
 596                 }
 597
 598                 return false;
 599         }
 600
 601         /**
 602          * @brief Check if email address is allowed to register here.
 603          *
 604          * Compare against our list (wildcards allowed).
 605          *
 606          * @param  string $email email address
 607          * @return boolean False if not allowed, true if allowed
 608          *    or if allowed list is not configured
 609          */
 610         public static function isEmailDomainAllowed($email)
 611         {
 612                 $domain = strtolower(substr($email, strpos($email, '@') + 1));
 613                 if (!$domain) {
 614                         return false;
 615                 }
 616
 617                 $str_allowed = Config::get('system', 'allowed_email', '');
 618                 if (!x($str_allowed)) {
 619                         return true;
 620                 }
 621
 622                 $allowed = explode(',', $str_allowed);
 623
 624                 return self::isDomainAllowed($domain, $allowed);
 625         }
 626
 627         /**
 628          * Checks for the existence of a domain in a domain list
 629          *
 630          * @brief Checks for the existence of a domain in a domain list
 631          * @param string $domain
 632          * @param array  $domain_list
 633          * @return boolean
 634          */
 635         public static function isDomainAllowed($domain, array $domain_list)
 636         {
 637                 $found = false;
 638
 639                 foreach ($domain_list as $item) {
 640                         $pat = strtolower(trim($item));
 641                         if (fnmatch($pat, $domain) || ($pat == $domain)) {
 642                                 $found = true;
 643                                 break;
 644                         }
 645                 }
 646
 647                 return $found;
 648         }
 649
 650         public static function lookupAvatarByEmail($email)
 651         {
 652                 $avatar['size'] = 175;
 653                 $avatar['email'] = $email;
 654                 $avatar['url'] = '';
 655                 $avatar['success'] = false;
 656
 657                 Addon::callHooks('avatar_lookup', $avatar);
 658
 659                 if (! $avatar['success']) {
 660                         $avatar['url'] = System::baseUrl() . '/images/person-175.jpg';
 661                 }
 662
 663                 logger('Avatar: ' . $avatar['email'] . ' ' . $avatar['url'], LOGGER_DEBUG);
 664                 return $avatar['url'];
 665         }
 666
 667         /**
 668          * @brief Remove Google Analytics and other tracking platforms params from URL
 669          *
 670          * @param string $url Any user-submitted URL that may contain tracking params
 671          * @return string The same URL stripped of tracking parameters
 672          */
 673         public static function stripTrackingQueryParams($url)
 674         {
 675                 $urldata = parse_url($url);
 676                 if (!empty($urldata["query"])) {
 677                         $query = $urldata["query"];
 678                         parse_str($query, $querydata);
 679
 680                         if (is_array($querydata)) {
 681                                 foreach ($querydata as $param => $value) {
 682                                         if (in_array(
 683                                                 $param,
 684                                                 [
 685                                                         "utm_source", "utm_medium", "utm_term", "utm_content", "utm_campaign",
 686                                                         "wt_mc", "pk_campaign", "pk_kwd", "mc_cid", "mc_eid",
 687                                                         "fb_action_ids", "fb_action_types", "fb_ref",
 688                                                         "awesm", "wtrid",
 689                                                         "woo_campaign", "woo_source", "woo_medium", "woo_content", "woo_term"]
 690                                                 )
 691                                         ) {
 692                                                 $pair = $param . "=" . urlencode($value);
 693                                                 $url = str_replace($pair, "", $url);
 694
 695                                                 // Second try: if the url isn't encoded completely
 696                                                 $pair = $param . "=" . str_replace(" ", "+", $value);
 697                                                 $url = str_replace($pair, "", $url);
 698
 699                                                 // Third try: Maybey the url isn't encoded at all
 700                                                 $pair = $param . "=" . $value;
 701                                                 $url = str_replace($pair, "", $url);
 702
 703                                                 $url = str_replace(["?&", "&&"], ["?", ""], $url);
 704                                         }
 705                                 }
 706                         }
 707
 708                         if (substr($url, -1, 1) == "?") {
 709                                 $url = substr($url, 0, -1);
 710                         }
 711                 }
 712
 713                 return $url;
 714         }
 715
 716         /**
 717          * @brief Returns the original URL of the provided URL
 718          *
 719          * This function strips tracking query params and follows redirections, either
 720          * through HTTP code or meta refresh tags. Stops after 10 redirections.
 721          *
 722          * @todo Remove the $fetchbody parameter that generates an extraneous HEAD request
 723          *
 724          * @see ParseUrl::getSiteinfo
 725          *
 726          * @param string $url       A user-submitted URL
 727          * @param int    $depth     The current redirection recursion level (internal)
 728          * @param bool   $fetchbody Wether to fetch the body or not after the HEAD requests
 729          * @return string A canonical URL
 730          */
 731         public static function finalUrl($url, $depth = 1, $fetchbody = false)
 732         {
 733                 $a = get_app();
 734
 735                 $url = self::stripTrackingQueryParams($url);
 736
 737                 if ($depth > 10) {
 738                         return $url;
 739                 }
 740
 741                 $url = trim($url, "'");
 742
 743                 $stamp1 = microtime(true);
 744
 745                 $ch = curl_init();
 746                 curl_setopt($ch, CURLOPT_URL, $url);
 747                 curl_setopt($ch, CURLOPT_HEADER, 1);
 748                 curl_setopt($ch, CURLOPT_NOBODY, 1);
 749                 curl_setopt($ch, CURLOPT_TIMEOUT, 10);
 750                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 751                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 752
 753                 curl_exec($ch);
 754                 $curl_info = @curl_getinfo($ch);
 755                 $http_code = $curl_info['http_code'];
 756                 curl_close($ch);
 757
 758                 $a->saveTimestamp($stamp1, "network");
 759
 760                 if ($http_code == 0) {
 761                         return $url;
 762                 }
 763
 764                 if (in_array($http_code, ['301', '302'])) {
 765                         if (!empty($curl_info['redirect_url'])) {
 766                                 return self::finalUrl($curl_info['redirect_url'], ++$depth, $fetchbody);
 767                         } elseif (!empty($curl_info['location'])) {
 768                                 return self::finalUrl($curl_info['location'], ++$depth, $fetchbody);
 769                         }
 770                 }
 771
 772                 // Check for redirects in the meta elements of the body if there are no redirects in the header.
 773                 if (!$fetchbody) {
 774                         return(self::finalUrl($url, ++$depth, true));
 775                 }
 776
 777                 // if the file is too large then exit
 778                 if ($curl_info["download_content_length"] > 1000000) {
 779                         return $url;
 780                 }
 781
 782                 // if it isn't a HTML file then exit
 783                 if (!empty($curl_info["content_type"]) && !strstr(strtolower($curl_info["content_type"]), "html")) {
 784                         return $url;
 785                 }
 786
 787                 $stamp1 = microtime(true);
 788
 789                 $ch = curl_init();
 790                 curl_setopt($ch, CURLOPT_URL, $url);
 791                 curl_setopt($ch, CURLOPT_HEADER, 0);
 792                 curl_setopt($ch, CURLOPT_NOBODY, 0);
 793                 curl_setopt($ch, CURLOPT_TIMEOUT, 10);
 794                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 795                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 796
 797                 $body = curl_exec($ch);
 798                 curl_close($ch);
 799
 800                 $a->saveTimestamp($stamp1, "network");
 801
 802                 if (trim($body) == "") {
 803                         return $url;
 804                 }
 805
 806                 // Check for redirect in meta elements
 807                 $doc = new DOMDocument();
 808                 @$doc->loadHTML($body);
 809
 810                 $xpath = new DomXPath($doc);
 811
 812                 $list = $xpath->query("//meta[@content]");
 813                 foreach ($list as $node) {
 814                         $attr = [];
 815                         if ($node->attributes->length) {
 816                                 foreach ($node->attributes as $attribute) {
 817                                         $attr[$attribute->name] = $attribute->value;
 818                                 }
 819                         }
 820
 821                         if (@$attr["http-equiv"] == 'refresh') {
 822                                 $path = $attr["content"];
 823                                 $pathinfo = explode(";", $path);
 824                                 foreach ($pathinfo as $value) {
 825                                         if (substr(strtolower($value), 0, 4) == "url=") {
 826                                                 return self::finalUrl(substr($value, 4), ++$depth);
 827                                         }
 828                                 }
 829                         }
 830                 }
 831
 832                 return $url;
 833         }
 834
 835         /**
 836          * @brief Find the matching part between two url
 837          *
 838          * @param string $url1
 839          * @param string $url2
 840          * @return string The matching part
 841          */
 842         public static function getUrlMatch($url1, $url2)
 843         {
 844                 if (($url1 == "") || ($url2 == "")) {
 845                         return "";
 846                 }
 847
 848                 $url1 = normalise_link($url1);
 849                 $url2 = normalise_link($url2);
 850
 851                 $parts1 = parse_url($url1);
 852                 $parts2 = parse_url($url2);
 853
 854                 if (!isset($parts1["host"]) || !isset($parts2["host"])) {
 855                         return "";
 856                 }
 857
 858                 if (empty($parts1["scheme"])) {
 859                         $parts1["scheme"] = '';
 860                 }
 861                 if (empty($parts2["scheme"])) {
 862                         $parts2["scheme"] = '';
 863                 }
 864
 865                 if ($parts1["scheme"] != $parts2["scheme"]) {
 866                         return "";
 867                 }
 868
 869                 if (empty($parts1["host"])) {
 870                         $parts1["host"] = '';
 871                 }
 872                 if (empty($parts2["host"])) {
 873                         $parts2["host"] = '';
 874                 }
 875
 876                 if ($parts1["host"] != $parts2["host"]) {
 877                         return "";
 878                 }
 879
 880                 if (empty($parts1["port"])) {
 881                         $parts1["port"] = '';
 882                 }
 883                 if (empty($parts2["port"])) {
 884                         $parts2["port"] = '';
 885                 }
 886
 887                 if ($parts1["port"] != $parts2["port"]) {
 888                         return "";
 889                 }
 890
 891                 $match = $parts1["scheme"]."://".$parts1["host"];
 892
 893                 if ($parts1["port"]) {
 894                         $match .= ":".$parts1["port"];
 895                 }
 896
 897                 if (empty($parts1["path"])) {
 898                         $parts1["path"] = '';
 899                 }
 900                 if (empty($parts2["path"])) {
 901                         $parts2["path"] = '';
 902                 }
 903
 904                 $pathparts1 = explode("/", $parts1["path"]);
 905                 $pathparts2 = explode("/", $parts2["path"]);
 906
 907                 $i = 0;
 908                 $path = "";
 909                 do {
 910                         $path1 = defaults($pathparts1, $i, '');
 911                         $path2 = defaults($pathparts2, $i, '');
 912
 913                         if ($path1 == $path2) {
 914                                 $path .= $path1."/";
 915                         }
 916                 } while (($path1 == $path2) && ($i++ <= count($pathparts1)));
 917
 918                 $match .= $path;
 919
 920                 return normalise_link($match);
 921         }
 922
 923         /**
 924          * @brief Glue url parts together
 925          *
 926          * @param array $parsed URL parts
 927          *
 928          * @return string The glued URL
 929          */
 930         public static function unparseURL($parsed)
 931         {
 932                 $get = function ($key) use ($parsed) {
 933                         return isset($parsed[$key]) ? $parsed[$key] : null;
 934                 };
 935
 936                 $pass      = $get('pass');
 937                 $user      = $get('user');
 938                 $userinfo  = $pass !== null ? "$user:$pass" : $user;
 939                 $port      = $get('port');
 940                 $scheme    = $get('scheme');
 941                 $query     = $get('query');
 942                 $fragment  = $get('fragment');
 943                 $authority = ($userinfo !== null ? $userinfo."@" : '') .
 944                                                 $get('host') .
 945                                                 ($port ? ":$port" : '');
 946
 947                 return  (strlen($scheme) ? $scheme.":" : '') .
 948                         (strlen($authority) ? "//".$authority : '') .
 949                         $get('path') .
 950                         (strlen($query) ? "?".$query : '') .
 951                         (strlen($fragment) ? "#".$fragment : '');
 952         }
 953 }