src/Util/Network.php

   1 <?php
   2 /**
   3  * @file src/Util/Network.php
   4  */
   5 namespace Friendica\Util;
   6
   7 use Friendica\Core\Hook;
   8 use Friendica\Core\Logger;
   9 use Friendica\Core\System;
  10 use Friendica\Core\Config;
  11 use Friendica\Network\CurlResult;
  12 use DOMDocument;
  13 use DomXPath;
  14
  15 class Network
  16 {
  17         /**
  18          * Curl wrapper
  19          *
  20          * If binary flag is true, return binary results.
  21          * Set the cookiejar argument to a string (e.g. "/tmp/friendica-cookies.txt")
  22          * to preserve cookies from one request to the next.
  23          *
  24          * @brief Curl wrapper
  25          * @param string  $url            URL to fetch
  26          * @param boolean $binary         default false
  27          *                                TRUE if asked to return binary results (file download)
  28          * @param integer $redirects      The recursion counter for internal use - default 0
  29          * @param integer $timeout        Timeout in seconds, default system config value or 60 seconds
  30          * @param string  $accept_content supply Accept: header with 'accept_content' as the value
  31          * @param string  $cookiejar      Path to cookie jar file
  32          *
  33          * @return string The fetched content
  34          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  35          */
  36         public static function fetchUrl($url, $binary = false, &$redirects = 0, $timeout = 0, $accept_content = null, $cookiejar = '')
  37         {
  38                 $ret = self::fetchUrlFull($url, $binary, $redirects, $timeout, $accept_content, $cookiejar);
  39
  40                 return $ret->getBody();
  41         }
  42
  43         /**
  44          * Curl wrapper with array of return values.
  45          *
  46          * Inner workings and parameters are the same as @ref fetchUrl but returns an array with
  47          * all the information collected during the fetch.
  48          *
  49          * @brief Curl wrapper with array of return values.
  50          * @param string  $url            URL to fetch
  51          * @param boolean $binary         default false
  52          *                                TRUE if asked to return binary results (file download)
  53          * @param integer $redirects      The recursion counter for internal use - default 0
  54          * @param integer $timeout        Timeout in seconds, default system config value or 60 seconds
  55          * @param string  $accept_content supply Accept: header with 'accept_content' as the value
  56          * @param string  $cookiejar      Path to cookie jar file
  57          *
  58          * @return CurlResult With all relevant information, 'body' contains the actual fetched content.
  59          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  60          */
  61         public static function fetchUrlFull($url, $binary = false, &$redirects = 0, $timeout = 0, $accept_content = null, $cookiejar = '')
  62         {
  63                 return self::curl(
  64                         $url,
  65                         $binary,
  66                         $redirects,
  67                         ['timeout'=>$timeout,
  68                         'accept_content'=>$accept_content,
  69                         'cookiejar'=>$cookiejar
  70                         ]
  71                 );
  72         }
  73
  74         /**
  75          * @brief fetches an URL.
  76          *
  77          * @param string  $url       URL to fetch
  78          * @param boolean $binary    default false
  79          *                           TRUE if asked to return binary results (file download)
  80          * @param int     $redirects The recursion counter for internal use - default 0
  81          * @param array   $opts      (optional parameters) assoziative array with:
  82          *                           'accept_content' => supply Accept: header with 'accept_content' as the value
  83          *                           'timeout' => int Timeout in seconds, default system config value or 60 seconds
  84          *                           'http_auth' => username:password
  85          *                           'novalidate' => do not validate SSL certs, default is to validate using our CA list
  86          *                           'nobody' => only return the header
  87          *                           'cookiejar' => path to cookie jar file
  88          *                           'header' => header array
  89          *
  90          * @return CurlResult
  91          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  92          */
  93         public static function curl($url, $binary = false, &$redirects = 0, $opts = [])
  94         {
  95                 $ret = ['return_code' => 0, 'success' => false, 'header' => '', 'info' => '', 'body' => ''];
  96
  97                 $stamp1 = microtime(true);
  98
  99                 $a = \get_app();
 100
 101                 if (strlen($url) > 1000) {
 102                         Logger::log('URL is longer than 1000 characters. Callstack: ' . System::callstack(20), Logger::DEBUG);
 103                         return CurlResult::createErrorCurl(substr($url, 0, 200));
 104                 }
 105
 106                 $parts = parse_url($url);
 107                 $path_parts = explode('/', defaults($parts, 'path', ''));
 108                 foreach ($path_parts as $part) {
 109                         if (strlen($part) <> mb_strlen($part)) {
 110                                 $parts2[] = rawurlencode($part);
 111                         } else {
 112                                 $parts2[] = $part;
 113                         }
 114                 }
 115                 $parts['path'] = implode('/', $parts2);
 116                 $url = self::unparseURL($parts);
 117
 118                 if (self::isUrlBlocked($url)) {
 119                         Logger::log('domain of ' . $url . ' is blocked', Logger::DATA);
 120                         return CurlResult::createErrorCurl($url);
 121                 }
 122
 123                 $ch = @curl_init($url);
 124
 125                 if (($redirects > 8) || (!$ch)) {
 126                         return CurlResult::createErrorCurl($url);
 127                 }
 128
 129                 @curl_setopt($ch, CURLOPT_HEADER, true);
 130
 131                 if (!empty($opts['cookiejar'])) {
 132                         curl_setopt($ch, CURLOPT_COOKIEJAR, $opts["cookiejar"]);
 133                         curl_setopt($ch, CURLOPT_COOKIEFILE, $opts["cookiejar"]);
 134                 }
 135
 136                 // These settings aren't needed. We're following the location already.
 137                 //      @curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 138                 //      @curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
 139
 140                 if (!empty($opts['accept_content'])) {
 141                         curl_setopt(
 142                                 $ch,
 143                                 CURLOPT_HTTPHEADER,
 144                                 ['Accept: ' . $opts['accept_content']]
 145                         );
 146                 }
 147
 148                 if (!empty($opts['header'])) {
 149                         curl_setopt($ch, CURLOPT_HTTPHEADER, $opts['header']);
 150                 }
 151
 152                 @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 153                 @curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 154
 155                 $range = intval(Config::get('system', 'curl_range_bytes', 0));
 156
 157                 if ($range > 0) {
 158                         @curl_setopt($ch, CURLOPT_RANGE, '0-' . $range);
 159                 }
 160
 161                 // Without this setting it seems as if some webservers send compressed content
 162                 // This seems to confuse curl so that it shows this uncompressed.
 163                 /// @todo  We could possibly set this value to "gzip" or something similar
 164                 curl_setopt($ch, CURLOPT_ENCODING, '');
 165
 166                 if (!empty($opts['headers'])) {
 167                         @curl_setopt($ch, CURLOPT_HTTPHEADER, $opts['headers']);
 168                 }
 169
 170                 if (!empty($opts['nobody'])) {
 171                         @curl_setopt($ch, CURLOPT_NOBODY, $opts['nobody']);
 172                 }
 173
 174                 if (!empty($opts['timeout'])) {
 175                         @curl_setopt($ch, CURLOPT_TIMEOUT, $opts['timeout']);
 176                 } else {
 177                         $curl_time = Config::get('system', 'curl_timeout', 60);
 178                         @curl_setopt($ch, CURLOPT_TIMEOUT, intval($curl_time));
 179                 }
 180
 181                 // by default we will allow self-signed certs
 182                 // but you can override this
 183
 184                 $check_cert = Config::get('system', 'verifyssl');
 185                 @curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
 186
 187                 if ($check_cert) {
 188                         @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
 189                 }
 190
 191                 $proxy = Config::get('system', 'proxy');
 192
 193                 if (strlen($proxy)) {
 194                         @curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
 195                         @curl_setopt($ch, CURLOPT_PROXY, $proxy);
 196                         $proxyuser = @Config::get('system', 'proxyuser');
 197
 198                         if (strlen($proxyuser)) {
 199                                 @curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyuser);
 200                         }
 201                 }
 202
 203                 if (Config::get('system', 'ipv4_resolve', false)) {
 204                         curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 205                 }
 206
 207                 if ($binary) {
 208                         @curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
 209                 }
 210
 211                 // don't let curl abort the entire application
 212                 // if it throws any errors.
 213
 214                 $s = @curl_exec($ch);
 215                 $curl_info = @curl_getinfo($ch);
 216
 217                 // Special treatment for HTTP Code 416
 218                 // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/416
 219                 if (($curl_info['http_code'] == 416) && ($range > 0)) {
 220                         @curl_setopt($ch, CURLOPT_RANGE, '');
 221                         $s = @curl_exec($ch);
 222                         $curl_info = @curl_getinfo($ch);
 223                 }
 224
 225                 $curlResponse = new CurlResult($url, $s, $curl_info, curl_errno($ch), curl_error($ch));
 226
 227                 if ($curlResponse->isRedirectUrl()) {
 228                         $redirects++;
 229                         Logger::log('curl: redirect ' . $url . ' to ' . $curlResponse->getRedirectUrl());
 230                         @curl_close($ch);
 231                         return self::curl($curlResponse->getRedirectUrl(), $binary, $redirects, $opts);
 232                 }
 233
 234                 @curl_close($ch);
 235
 236                 $a->saveTimestamp($stamp1, 'network');
 237
 238                 return $curlResponse;
 239         }
 240
 241         /**
 242          * @brief Send POST request to $url
 243          *
 244          * @param string  $url       URL to post
 245          * @param mixed   $params    array of POST variables
 246          * @param string  $headers   HTTP headers
 247          * @param integer $redirects Recursion counter for internal use - default = 0
 248          * @param integer $timeout   The timeout in seconds, default system config value or 60 seconds
 249          *
 250          * @return CurlResult The content
 251          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 252          */
 253         public static function post($url, $params, $headers = null, &$redirects = 0, $timeout = 0)
 254         {
 255                 $stamp1 = microtime(true);
 256
 257                 if (self::isUrlBlocked($url)) {
 258                         Logger::log('post_url: domain of ' . $url . ' is blocked', Logger::DATA);
 259                         return CurlResult::createErrorCurl($url);
 260                 }
 261
 262                 $a = \get_app();
 263                 $ch = curl_init($url);
 264
 265                 if (($redirects > 8) || (!$ch)) {
 266                         return CurlResult::createErrorCurl($url);
 267                 }
 268
 269                 Logger::log('post_url: start ' . $url, Logger::DATA);
 270
 271                 curl_setopt($ch, CURLOPT_HEADER, true);
 272                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 273                 curl_setopt($ch, CURLOPT_POST, 1);
 274                 curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
 275                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 276
 277                 if (Config::get('system', 'ipv4_resolve', false)) {
 278                         curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 279                 }
 280
 281                 if (intval($timeout)) {
 282                         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
 283                 } else {
 284                         $curl_time = Config::get('system', 'curl_timeout', 60);
 285                         curl_setopt($ch, CURLOPT_TIMEOUT, intval($curl_time));
 286                 }
 287
 288                 if (defined('LIGHTTPD')) {
 289                         if (!is_array($headers)) {
 290                                 $headers = ['Expect:'];
 291                         } else {
 292                                 if (!in_array('Expect:', $headers)) {
 293                                         array_push($headers, 'Expect:');
 294                                 }
 295                         }
 296                 }
 297
 298                 if ($headers) {
 299                         curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 300                 }
 301
 302                 $check_cert = Config::get('system', 'verifyssl');
 303                 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, (($check_cert) ? true : false));
 304
 305                 if ($check_cert) {
 306                         @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
 307                 }
 308
 309                 $proxy = Config::get('system', 'proxy');
 310
 311                 if (strlen($proxy)) {
 312                         curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
 313                         curl_setopt($ch, CURLOPT_PROXY, $proxy);
 314                         $proxyuser = Config::get('system', 'proxyuser');
 315                         if (strlen($proxyuser)) {
 316                                 curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyuser);
 317                         }
 318                 }
 319
 320                 // don't let curl abort the entire application
 321                 // if it throws any errors.
 322
 323                 $s = @curl_exec($ch);
 324
 325                 $base = $s;
 326                 $curl_info = curl_getinfo($ch);
 327
 328                 $curlResponse = new CurlResult($url, $s, $curl_info, curl_errno($ch), curl_error($ch));
 329
 330                 if ($curlResponse->isRedirectUrl()) {
 331                         $redirects++;
 332                         Logger::log('post_url: redirect ' . $url . ' to ' . $curlResponse->getRedirectUrl());
 333                         curl_close($ch);
 334                         return self::post($curlResponse->getRedirectUrl(), $params, $headers, $redirects, $timeout);
 335                 }
 336
 337                 curl_close($ch);
 338
 339                 $a->saveTimestamp($stamp1, 'network');
 340
 341                 Logger::log('post_url: end ' . $url, Logger::DATA);
 342
 343                 return $curlResponse;
 344         }
 345
 346         /**
 347          * @brief Check URL to see if it's real
 348          *
 349          * Take a URL from the wild, prepend http:// if necessary
 350          * and check DNS to see if it's real (or check if is a valid IP address)
 351          *
 352          * @param string $url The URL to be validated
 353          * @return string|boolean The actual working URL, false else
 354          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 355          */
 356         public static function isUrlValid($url)
 357         {
 358                 if (Config::get('system', 'disable_url_validation')) {
 359                         return $url;
 360                 }
 361
 362                 // no naked subdomains (allow localhost for tests)
 363                 if (strpos($url, '.') === false && strpos($url, '/localhost/') === false) {
 364                         return false;
 365                 }
 366
 367                 if (substr($url, 0, 4) != 'http') {
 368                         $url = 'http://' . $url;
 369                 }
 370
 371                 /// @TODO Really suppress function outcomes? Why not find them + debug them?
 372                 $h = @parse_url($url);
 373
 374                 if (!empty($h['host']) && (@dns_get_record($h['host'], DNS_A + DNS_CNAME) || filter_var($h['host'], FILTER_VALIDATE_IP) )) {
 375                         return $url;
 376                 }
 377
 378                 return false;
 379         }
 380
 381         /**
 382          * @brief Checks that email is an actual resolvable internet address
 383          *
 384          * @param string $addr The email address
 385          * @return boolean True if it's a valid email address, false if it's not
 386          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 387          */
 388         public static function isEmailDomainValid($addr)
 389         {
 390                 if (Config::get('system', 'disable_email_validation')) {
 391                         return true;
 392                 }
 393
 394                 if (! strpos($addr, '@')) {
 395                         return false;
 396                 }
 397
 398                 $h = substr($addr, strpos($addr, '@') + 1);
 399
 400                 // Concerning the @ see here: https://stackoverflow.com/questions/36280957/dns-get-record-a-temporary-server-error-occurred
 401                 if ($h && (@dns_get_record($h, DNS_A + DNS_MX) || filter_var($h, FILTER_VALIDATE_IP) )) {
 402                         return true;
 403                 }
 404                 if ($h && @dns_get_record($h, DNS_CNAME + DNS_MX)) {
 405                         return true;
 406                 }
 407                 return false;
 408         }
 409
 410         /**
 411          * @brief Check if URL is allowed
 412          *
 413          * Check $url against our list of allowed sites,
 414          * wildcards allowed. If allowed_sites is unset return true;
 415          *
 416          * @param string $url URL which get tested
 417          * @return boolean True if url is allowed otherwise return false
 418          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 419          */
 420         public static function isUrlAllowed($url)
 421         {
 422                 $h = @parse_url($url);
 423
 424                 if (! $h) {
 425                         return false;
 426                 }
 427
 428                 $str_allowed = Config::get('system', 'allowed_sites');
 429                 if (! $str_allowed) {
 430                         return true;
 431                 }
 432
 433                 $found = false;
 434
 435                 $host = strtolower($h['host']);
 436
 437                 // always allow our own site
 438                 if ($host == strtolower($_SERVER['SERVER_NAME'])) {
 439                         return true;
 440                 }
 441
 442                 $fnmatch = function_exists('fnmatch');
 443                 $allowed = explode(',', $str_allowed);
 444
 445                 if (count($allowed)) {
 446                         foreach ($allowed as $a) {
 447                                 $pat = strtolower(trim($a));
 448                                 if (($fnmatch && fnmatch($pat, $host)) || ($pat == $host)) {
 449                                         $found = true;
 450                                         break;
 451                                 }
 452                         }
 453                 }
 454                 return $found;
 455         }
 456
 457         /**
 458          * Checks if the provided url domain is on the domain blocklist.
 459          * Returns true if it is or malformed URL, false if not.
 460          *
 461          * @param string $url The url to check the domain from
 462          *
 463          * @return boolean
 464          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 465          */
 466         public static function isUrlBlocked($url)
 467         {
 468                 $host = @parse_url($url, PHP_URL_HOST);
 469                 if (!$host) {
 470                         return false;
 471                 }
 472
 473                 $domain_blocklist = Config::get('system', 'blocklist', []);
 474                 if (!$domain_blocklist) {
 475                         return false;
 476                 }
 477
 478                 foreach ($domain_blocklist as $domain_block) {
 479                         if (strcasecmp($domain_block['domain'], $host) === 0) {
 480                                 return true;
 481                         }
 482                 }
 483
 484                 return false;
 485         }
 486
 487         /**
 488          * @brief Check if email address is allowed to register here.
 489          *
 490          * Compare against our list (wildcards allowed).
 491          *
 492          * @param  string $email email address
 493          * @return boolean False if not allowed, true if allowed
 494          *                       or if allowed list is not configured
 495          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 496          */
 497         public static function isEmailDomainAllowed($email)
 498         {
 499                 $domain = strtolower(substr($email, strpos($email, '@') + 1));
 500                 if (!$domain) {
 501                         return false;
 502                 }
 503
 504                 $str_allowed = Config::get('system', 'allowed_email', '');
 505                 if (empty($str_allowed)) {
 506                         return true;
 507                 }
 508
 509                 $allowed = explode(',', $str_allowed);
 510
 511                 return self::isDomainAllowed($domain, $allowed);
 512         }
 513
 514         /**
 515          * Checks for the existence of a domain in a domain list
 516          *
 517          * @brief Checks for the existence of a domain in a domain list
 518          * @param string $domain
 519          * @param array  $domain_list
 520          * @return boolean
 521          */
 522         public static function isDomainAllowed($domain, array $domain_list)
 523         {
 524                 $found = false;
 525
 526                 foreach ($domain_list as $item) {
 527                         $pat = strtolower(trim($item));
 528                         if (fnmatch($pat, $domain) || ($pat == $domain)) {
 529                                 $found = true;
 530                                 break;
 531                         }
 532                 }
 533
 534                 return $found;
 535         }
 536
 537         public static function lookupAvatarByEmail($email)
 538         {
 539                 $avatar['size'] = 300;
 540                 $avatar['email'] = $email;
 541                 $avatar['url'] = '';
 542                 $avatar['success'] = false;
 543
 544                 Hook::callAll('avatar_lookup', $avatar);
 545
 546                 if (! $avatar['success']) {
 547                         $avatar['url'] = System::baseUrl() . '/images/person-300.jpg';
 548                 }
 549
 550                 Logger::log('Avatar: ' . $avatar['email'] . ' ' . $avatar['url'], Logger::DEBUG);
 551                 return $avatar['url'];
 552         }
 553
 554         /**
 555          * @brief Remove Google Analytics and other tracking platforms params from URL
 556          *
 557          * @param string $url Any user-submitted URL that may contain tracking params
 558          * @return string The same URL stripped of tracking parameters
 559          */
 560         public static function stripTrackingQueryParams($url)
 561         {
 562                 $urldata = parse_url($url);
 563                 if (!empty($urldata["query"])) {
 564                         $query = $urldata["query"];
 565                         parse_str($query, $querydata);
 566
 567                         if (is_array($querydata)) {
 568                                 foreach ($querydata as $param => $value) {
 569                                         if (in_array(
 570                                                 $param,
 571                                                 [
 572                                                         "utm_source", "utm_medium", "utm_term", "utm_content", "utm_campaign",
 573                                                         "wt_mc", "pk_campaign", "pk_kwd", "mc_cid", "mc_eid",
 574                                                         "fb_action_ids", "fb_action_types", "fb_ref",
 575                                                         "awesm", "wtrid",
 576                                                         "woo_campaign", "woo_source", "woo_medium", "woo_content", "woo_term"]
 577                                                 )
 578                                         ) {
 579                                                 $pair = $param . "=" . urlencode($value);
 580                                                 $url = str_replace($pair, "", $url);
 581
 582                                                 // Second try: if the url isn't encoded completely
 583                                                 $pair = $param . "=" . str_replace(" ", "+", $value);
 584                                                 $url = str_replace($pair, "", $url);
 585
 586                                                 // Third try: Maybey the url isn't encoded at all
 587                                                 $pair = $param . "=" . $value;
 588                                                 $url = str_replace($pair, "", $url);
 589
 590                                                 $url = str_replace(["?&", "&&"], ["?", ""], $url);
 591                                         }
 592                                 }
 593                         }
 594
 595                         if (substr($url, -1, 1) == "?") {
 596                                 $url = substr($url, 0, -1);
 597                         }
 598                 }
 599
 600                 return $url;
 601         }
 602
 603         /**
 604          * @brief Returns the original URL of the provided URL
 605          *
 606          * This function strips tracking query params and follows redirections, either
 607          * through HTTP code or meta refresh tags. Stops after 10 redirections.
 608          *
 609          * @todo  Remove the $fetchbody parameter that generates an extraneous HEAD request
 610          *
 611          * @see   ParseUrl::getSiteinfo
 612          *
 613          * @param string $url       A user-submitted URL
 614          * @param int    $depth     The current redirection recursion level (internal)
 615          * @param bool   $fetchbody Wether to fetch the body or not after the HEAD requests
 616          * @return string A canonical URL
 617          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 618          */
 619         public static function finalUrl($url, $depth = 1, $fetchbody = false)
 620         {
 621                 $a = \get_app();
 622
 623                 $url = self::stripTrackingQueryParams($url);
 624
 625                 if ($depth > 10) {
 626                         return $url;
 627                 }
 628
 629                 $url = trim($url, "'");
 630
 631                 $stamp1 = microtime(true);
 632
 633                 $ch = curl_init();
 634                 curl_setopt($ch, CURLOPT_URL, $url);
 635                 curl_setopt($ch, CURLOPT_HEADER, 1);
 636                 curl_setopt($ch, CURLOPT_NOBODY, 1);
 637                 curl_setopt($ch, CURLOPT_TIMEOUT, 10);
 638                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 639                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 640
 641                 curl_exec($ch);
 642                 $curl_info = @curl_getinfo($ch);
 643                 $http_code = $curl_info['http_code'];
 644                 curl_close($ch);
 645
 646                 $a->saveTimestamp($stamp1, "network");
 647
 648                 if ($http_code == 0) {
 649                         return $url;
 650                 }
 651
 652                 if (in_array($http_code, ['301', '302'])) {
 653                         if (!empty($curl_info['redirect_url'])) {
 654                                 return self::finalUrl($curl_info['redirect_url'], ++$depth, $fetchbody);
 655                         } elseif (!empty($curl_info['location'])) {
 656                                 return self::finalUrl($curl_info['location'], ++$depth, $fetchbody);
 657                         }
 658                 }
 659
 660                 // Check for redirects in the meta elements of the body if there are no redirects in the header.
 661                 if (!$fetchbody) {
 662                         return(self::finalUrl($url, ++$depth, true));
 663                 }
 664
 665                 // if the file is too large then exit
 666                 if ($curl_info["download_content_length"] > 1000000) {
 667                         return $url;
 668                 }
 669
 670                 // if it isn't a HTML file then exit
 671                 if (!empty($curl_info["content_type"]) && !strstr(strtolower($curl_info["content_type"]), "html")) {
 672                         return $url;
 673                 }
 674
 675                 $stamp1 = microtime(true);
 676
 677                 $ch = curl_init();
 678                 curl_setopt($ch, CURLOPT_URL, $url);
 679                 curl_setopt($ch, CURLOPT_HEADER, 0);
 680                 curl_setopt($ch, CURLOPT_NOBODY, 0);
 681                 curl_setopt($ch, CURLOPT_TIMEOUT, 10);
 682                 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 683                 curl_setopt($ch, CURLOPT_USERAGENT, $a->getUserAgent());
 684
 685                 $body = curl_exec($ch);
 686                 curl_close($ch);
 687
 688                 $a->saveTimestamp($stamp1, "network");
 689
 690                 if (trim($body) == "") {
 691                         return $url;
 692                 }
 693
 694                 // Check for redirect in meta elements
 695                 $doc = new DOMDocument();
 696                 @$doc->loadHTML($body);
 697
 698                 $xpath = new DomXPath($doc);
 699
 700                 $list = $xpath->query("//meta[@content]");
 701                 foreach ($list as $node) {
 702                         $attr = [];
 703                         if ($node->attributes->length) {
 704                                 foreach ($node->attributes as $attribute) {
 705                                         $attr[$attribute->name] = $attribute->value;
 706                                 }
 707                         }
 708
 709                         if (@$attr["http-equiv"] == 'refresh') {
 710                                 $path = $attr["content"];
 711                                 $pathinfo = explode(";", $path);
 712                                 foreach ($pathinfo as $value) {
 713                                         if (substr(strtolower($value), 0, 4) == "url=") {
 714                                                 return self::finalUrl(substr($value, 4), ++$depth);
 715                                         }
 716                                 }
 717                         }
 718                 }
 719
 720                 return $url;
 721         }
 722
 723         /**
 724          * @brief Find the matching part between two url
 725          *
 726          * @param string $url1
 727          * @param string $url2
 728          * @return string The matching part
 729          */
 730         public static function getUrlMatch($url1, $url2)
 731         {
 732                 if (($url1 == "") || ($url2 == "")) {
 733                         return "";
 734                 }
 735
 736                 $url1 = Strings::normaliseLink($url1);
 737                 $url2 = Strings::normaliseLink($url2);
 738
 739                 $parts1 = parse_url($url1);
 740                 $parts2 = parse_url($url2);
 741
 742                 if (!isset($parts1["host"]) || !isset($parts2["host"])) {
 743                         return "";
 744                 }
 745
 746                 if (empty($parts1["scheme"])) {
 747                         $parts1["scheme"] = '';
 748                 }
 749                 if (empty($parts2["scheme"])) {
 750                         $parts2["scheme"] = '';
 751                 }
 752
 753                 if ($parts1["scheme"] != $parts2["scheme"]) {
 754                         return "";
 755                 }
 756
 757                 if (empty($parts1["host"])) {
 758                         $parts1["host"] = '';
 759                 }
 760                 if (empty($parts2["host"])) {
 761                         $parts2["host"] = '';
 762                 }
 763
 764                 if ($parts1["host"] != $parts2["host"]) {
 765                         return "";
 766                 }
 767
 768                 if (empty($parts1["port"])) {
 769                         $parts1["port"] = '';
 770                 }
 771                 if (empty($parts2["port"])) {
 772                         $parts2["port"] = '';
 773                 }
 774
 775                 if ($parts1["port"] != $parts2["port"]) {
 776                         return "";
 777                 }
 778
 779                 $match = $parts1["scheme"]."://".$parts1["host"];
 780
 781                 if ($parts1["port"]) {
 782                         $match .= ":".$parts1["port"];
 783                 }
 784
 785                 if (empty($parts1["path"])) {
 786                         $parts1["path"] = '';
 787                 }
 788                 if (empty($parts2["path"])) {
 789                         $parts2["path"] = '';
 790                 }
 791
 792                 $pathparts1 = explode("/", $parts1["path"]);
 793                 $pathparts2 = explode("/", $parts2["path"]);
 794
 795                 $i = 0;
 796                 $path = "";
 797                 do {
 798                         $path1 = defaults($pathparts1, $i, '');
 799                         $path2 = defaults($pathparts2, $i, '');
 800
 801                         if ($path1 == $path2) {
 802                                 $path .= $path1."/";
 803                         }
 804                 } while (($path1 == $path2) && ($i++ <= count($pathparts1)));
 805
 806                 $match .= $path;
 807
 808                 return Strings::normaliseLink($match);
 809         }
 810
 811         /**
 812          * @brief Glue url parts together
 813          *
 814          * @param array $parsed URL parts
 815          *
 816          * @return string The glued URL
 817          */
 818         public static function unparseURL($parsed)
 819         {
 820                 $get = function ($key) use ($parsed) {
 821                         return isset($parsed[$key]) ? $parsed[$key] : null;
 822                 };
 823
 824                 $pass      = $get('pass');
 825                 $user      = $get('user');
 826                 $userinfo  = $pass !== null ? "$user:$pass" : $user;
 827                 $port      = $get('port');
 828                 $scheme    = $get('scheme');
 829                 $query     = $get('query');
 830                 $fragment  = $get('fragment');
 831                 $authority = ($userinfo !== null ? $userinfo."@" : '') .
 832                                                 $get('host') .
 833                                                 ($port ? ":$port" : '');
 834
 835                 return  (strlen($scheme) ? $scheme.":" : '') .
 836                         (strlen($authority) ? "//".$authority : '') .
 837                         $get('path') .
 838                         (strlen($query) ? "?".$query : '') .
 839                         (strlen($fragment) ? "#".$fragment : '');
 840         }
 841 }