includes/HttpFunctions.php

   1 <?php
   2 /**
   3  * @defgroup HTTP HTTP
   4  */
   5
   6 /**
   7  * Various HTTP related functions
   8  * @ingroup HTTP
   9  */
  10 class Http {
  11         static $httpEngine = false;
  12
  13         /**
  14          * Perform an HTTP request
  15          *
  16          * @param $method String: HTTP method. Usually GET/POST
  17          * @param $url String: full URL to act on
  18          * @param $options Array: options to pass to MWHttpRequest object.
  19          *      Possible keys for the array:
  20          *    - timeout             Timeout length in seconds
  21          *    - postData            An array of key-value pairs or a url-encoded form data
  22          *    - proxy               The proxy to use.
  23          *                          Will use $wgHTTPProxy (if set) otherwise.
  24          *    - noProxy             Override $wgHTTPProxy (if set) and don't use any proxy at all.
  25          *    - sslVerifyHost       (curl only) Verify hostname against certificate
  26          *    - sslVerifyCert       (curl only) Verify SSL certificate
  27          *    - caInfo              (curl only) Provide CA information
  28          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  29          *    - followRedirects     Whether to follow redirects (defaults to false).
  30          *                                  Note: this should only be used when the target URL is trusted,
  31          *                                  to avoid attacks on intranet services accessible by HTTP.
  32          * @return Mixed: (bool)false on failure or a string on success
  33          */
  34         public static function request( $method, $url, $options = array() ) {
  35                 $url = wfExpandUrl( $url );
  36                 wfDebug( "HTTP: $method: $url\n" );
  37                 $options['method'] = strtoupper( $method );
  38
  39                 if ( !isset( $options['timeout'] ) ) {
  40                         $options['timeout'] = 'default';
  41                 }
  42
  43                 $req = MWHttpRequest::factory( $url, $options );
  44                 $status = $req->execute();
  45
  46                 if ( $status->isOK() ) {
  47                         return $req->getContent();
  48                 } else {
  49                         return false;
  50                 }
  51         }
  52
  53         /**
  54          * Simple wrapper for Http::request( 'GET' )
  55          * @see Http::request()
  56          */
  57         public static function get( $url, $timeout = 'default', $options = array() ) {
  58                 $options['timeout'] = $timeout;
  59                 return Http::request( 'GET', $url, $options );
  60         }
  61
  62         /**
  63          * Simple wrapper for Http::request( 'POST' )
  64          * @see Http::request()
  65          */
  66         public static function post( $url, $options = array() ) {
  67                 return Http::request( 'POST', $url, $options );
  68         }
  69
  70         /**
  71          * Check if the URL can be served by localhost
  72          *
  73          * @param $url String: full url to check
  74          * @return Boolean
  75          */
  76         public static function isLocalURL( $url ) {
  77                 global $wgCommandLineMode, $wgConf;
  78
  79                 if ( $wgCommandLineMode ) {
  80                         return false;
  81                 }
  82
  83                 // Extract host part
  84                 $matches = array();
  85                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
  86                         $host = $matches[1];
  87                         // Split up dotwise
  88                         $domainParts = explode( '.', $host );
  89                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
  90                         $domainParts = array_reverse( $domainParts );
  91
  92                         $domain = '';
  93                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
  94                                 $domainPart = $domainParts[$i];
  95                                 if ( $i == 0 ) {
  96                                         $domain = $domainPart;
  97                                 } else {
  98                                         $domain = $domainPart . '.' . $domain;
  99                                 }
 100
 101                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 102                                         return true;
 103                                 }
 104                         }
 105                 }
 106
 107                 return false;
 108         }
 109
 110         /**
 111          * A standard user-agent we can use for external requests.
 112          * @return String
 113          */
 114         public static function userAgent() {
 115                 global $wgVersion;
 116                 return "MediaWiki/$wgVersion";
 117         }
 118
 119         /**
 120          * Checks that the given URI is a valid one. Hardcoding the
 121          * protocols, because we only want protocols that both cURL
 122          * and php support.
 123          *
 124          * @param $uri Mixed: URI to check for validity
 125          * @returns Boolean
 126          */
 127         public static function isValidURI( $uri ) {
 128                 return preg_match(
 129                         '/^(f|ht)tps?:\/\/[^\/\s]\S*$/D',
 130                         $uri
 131                 );
 132         }
 133 }
 134
 135 /**
 136  * This wrapper class will call out to curl (if available) or fallback
 137  * to regular PHP if necessary for handling internal HTTP requests.
 138  *
 139  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 140  * PHP's HTTP extension.
 141  */
 142 class MWHttpRequest {
 143         const SUPPORTS_FILE_POSTS = false;
 144
 145         protected $content;
 146         protected $timeout = 'default';
 147         protected $headersOnly = null;
 148         protected $postData = null;
 149         protected $proxy = null;
 150         protected $noProxy = false;
 151         protected $sslVerifyHost = true;
 152         protected $sslVerifyCert = true;
 153         protected $caInfo = null;
 154         protected $method = "GET";
 155         protected $reqHeaders = array();
 156         protected $url;
 157         protected $parsedUrl;
 158         protected $callback;
 159         protected $maxRedirects = 5;
 160         protected $followRedirects = false;
 161
 162         /**
 163          * @var  CookieJar
 164          */
 165         protected $cookieJar;
 166
 167         protected $headerList = array();
 168         protected $respVersion = "0.9";
 169         protected $respStatus = "200 Ok";
 170         protected $respHeaders = array();
 171
 172         public $status;
 173
 174         /**
 175          * @param $url String: url to use
 176          * @param $options Array: (optional) extra params to pass (see Http::request())
 177          */
 178         function __construct( $url, $options = array() ) {
 179                 global $wgHTTPTimeout;
 180
 181                 $this->url = $url;
 182                 $this->parsedUrl = parse_url( $url );
 183
 184                 if ( !Http::isValidURI( $this->url ) ) {
 185                         $this->status = Status::newFatal( 'http-invalid-url' );
 186                 } else {
 187                         $this->status = Status::newGood( 100 ); // continue
 188                 }
 189
 190                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 191                         $this->timeout = $options['timeout'];
 192                 } else {
 193                         $this->timeout = $wgHTTPTimeout;
 194                 }
 195
 196                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 197                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 198
 199                 foreach ( $members as $o ) {
 200                         if ( isset( $options[$o] ) ) {
 201                                 $this->$o = $options[$o];
 202                         }
 203                 }
 204         }
 205
 206         /**
 207          * Generate a new request object
 208          * @param $url String: url to use
 209          * @param $options Array: (optional) extra params to pass (see Http::request())
 210          * @see MWHttpRequest::__construct
 211          */
 212         public static function factory( $url, $options = null ) {
 213                 if ( !Http::$httpEngine ) {
 214                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 215                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 216                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 217                                                                    ' Http::$httpEngine is set to "curl"' );
 218                 }
 219
 220                 switch( Http::$httpEngine ) {
 221                         case 'curl':
 222                                 return new CurlHttpRequest( $url, $options );
 223                         case 'php':
 224                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 225                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 226                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 227                                 }
 228                                 return new PhpHttpRequest( $url, $options );
 229                         default:
 230                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 231                 }
 232         }
 233
 234         /**
 235          * Get the body, or content, of the response to the request
 236          *
 237          * @return String
 238          */
 239         public function getContent() {
 240                 return $this->content;
 241         }
 242
 243         /**
 244          * Set the parameters of the request
 245
 246          * @param $args Array
 247          * @todo overload the args param
 248          */
 249         public function setData( $args ) {
 250                 $this->postData = $args;
 251         }
 252
 253         /**
 254          * Take care of setting up the proxy
 255          * (override in subclass)
 256          *
 257          * @return String
 258          */
 259         public function proxySetup() {
 260                 global $wgHTTPProxy;
 261
 262                 if ( $this->proxy ) {
 263                         return;
 264                 }
 265
 266                 if ( Http::isLocalURL( $this->url ) ) {
 267                         $this->proxy = 'http://localhost:80/';
 268                 } elseif ( $wgHTTPProxy ) {
 269                         $this->proxy = $wgHTTPProxy ;
 270                 } elseif ( getenv( "http_proxy" ) ) {
 271                         $this->proxy = getenv( "http_proxy" );
 272                 }
 273         }
 274
 275         /**
 276          * Set the refererer header
 277          */
 278         public function setReferer( $url ) {
 279                 $this->setHeader( 'Referer', $url );
 280         }
 281
 282         /**
 283          * Set the user agent
 284          */
 285         public function setUserAgent( $UA ) {
 286                 $this->setHeader( 'User-Agent', $UA );
 287         }
 288
 289         /**
 290          * Set an arbitrary header
 291          */
 292         public function setHeader( $name, $value ) {
 293                 // I feel like I should normalize the case here...
 294                 $this->reqHeaders[$name] = $value;
 295         }
 296
 297         /**
 298          * Get an array of the headers
 299          */
 300         public function getHeaderList() {
 301                 $list = array();
 302
 303                 if ( $this->cookieJar ) {
 304                         $this->reqHeaders['Cookie'] =
 305                                 $this->cookieJar->serializeToHttpRequest(
 306                                         $this->parsedUrl['path'],
 307                                         $this->parsedUrl['host']
 308                                 );
 309                 }
 310
 311                 foreach ( $this->reqHeaders as $name => $value ) {
 312                         $list[] = "$name: $value";
 313                 }
 314
 315                 return $list;
 316         }
 317
 318         /**
 319          * Set a read callback to accept data read from the HTTP request.
 320          * By default, data is appended to an internal buffer which can be
 321          * retrieved through $req->getContent().
 322          *
 323          * To handle data as it comes in -- especially for large files that
 324          * would not fit in memory -- you can instead set your own callback,
 325          * in the form function($resource, $buffer) where the first parameter
 326          * is the low-level resource being read (implementation specific),
 327          * and the second parameter is the data buffer.
 328          *
 329          * You MUST return the number of bytes handled in the buffer; if fewer
 330          * bytes are reported handled than were passed to you, the HTTP fetch
 331          * will be aborted.
 332          *
 333          * @param $callback Callback
 334          */
 335         public function setCallback( $callback ) {
 336                 if ( !is_callable( $callback ) ) {
 337                         throw new MWException( 'Invalid MwHttpRequest callback' );
 338                 }
 339                 $this->callback = $callback;
 340         }
 341
 342         /**
 343          * A generic callback to read the body of the response from a remote
 344          * server.
 345          *
 346          * @param $fh handle
 347          * @param $content String
 348          */
 349         public function read( $fh, $content ) {
 350                 $this->content .= $content;
 351                 return strlen( $content );
 352         }
 353
 354         /**
 355          * Take care of whatever is necessary to perform the URI request.
 356          *
 357          * @return Status
 358          */
 359         public function execute() {
 360                 global $wgTitle;
 361
 362                 $this->content = "";
 363
 364                 if ( strtoupper( $this->method ) == "HEAD" ) {
 365                         $this->headersOnly = true;
 366                 }
 367
 368                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 369                         $this->setReferer( $wgTitle->getFullURL() );
 370                 }
 371
 372                 if ( !$this->noProxy ) {
 373                         $this->proxySetup();
 374                 }
 375
 376                 if ( !$this->callback ) {
 377                         $this->setCallback( array( $this, 'read' ) );
 378                 }
 379
 380                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 381                         $this->setUserAgent( Http::userAgent() );
 382                 }
 383         }
 384
 385         /**
 386          * Parses the headers, including the HTTP status code and any
 387          * Set-Cookie headers.  This function expectes the headers to be
 388          * found in an array in the member variable headerList.
 389          *
 390          * @return nothing
 391          */
 392         protected function parseHeader() {
 393                 $lastname = "";
 394
 395                 foreach ( $this->headerList as $header ) {
 396                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 397                                 $this->respVersion = $match[1];
 398                                 $this->respStatus = $match[2];
 399                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 400                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 401                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 402                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 403                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 404                                 $lastname = strtolower( $match[1] );
 405                         }
 406                 }
 407
 408                 $this->parseCookies();
 409         }
 410
 411         /**
 412          * Sets HTTPRequest status member to a fatal value with the error
 413          * message if the returned integer value of the status code was
 414          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 415          * RFC2616, section 10,
 416          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 417          * list of status codes.)
 418          *
 419          * @return nothing
 420          */
 421         protected function setStatus() {
 422                 if ( !$this->respHeaders ) {
 423                         $this->parseHeader();
 424                 }
 425
 426                 if ( (int)$this->respStatus > 399 ) {
 427                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 428                         $this->status->fatal( "http-bad-status", $code, $message );
 429                 }
 430         }
 431
 432         /**
 433          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 434          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 435          * for a list of status codes.)
 436          *
 437          * @return Integer
 438          */
 439         public function getStatus() {
 440                 if ( !$this->respHeaders ) {
 441                         $this->parseHeader();
 442                 }
 443
 444                 return (int)$this->respStatus;
 445         }
 446
 447
 448         /**
 449          * Returns true if the last status code was a redirect.
 450          *
 451          * @return Boolean
 452          */
 453         public function isRedirect() {
 454                 if ( !$this->respHeaders ) {
 455                         $this->parseHeader();
 456                 }
 457
 458                 $status = (int)$this->respStatus;
 459
 460                 if ( $status >= 300 && $status <= 303 ) {
 461                         return true;
 462                 }
 463
 464                 return false;
 465         }
 466
 467         /**
 468          * Returns an associative array of response headers after the
 469          * request has been executed.  Because some headers
 470          * (e.g. Set-Cookie) can appear more than once the, each value of
 471          * the associative array is an array of the values given.
 472          *
 473          * @return Array
 474          */
 475         public function getResponseHeaders() {
 476                 if ( !$this->respHeaders ) {
 477                         $this->parseHeader();
 478                 }
 479
 480                 return $this->respHeaders;
 481         }
 482
 483         /**
 484          * Returns the value of the given response header.
 485          *
 486          * @param $header String
 487          * @return String
 488          */
 489         public function getResponseHeader( $header ) {
 490                 if ( !$this->respHeaders ) {
 491                         $this->parseHeader();
 492                 }
 493
 494                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 495                         $v = $this->respHeaders[strtolower ( $header ) ];
 496                         return $v[count( $v ) - 1];
 497                 }
 498
 499                 return null;
 500         }
 501
 502         /**
 503          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 504          *
 505          * @param $jar CookieJar
 506          */
 507         public function setCookieJar( $jar ) {
 508                 $this->cookieJar = $jar;
 509         }
 510
 511         /**
 512          * Returns the cookie jar in use.
 513          *
 514          * @returns CookieJar
 515          */
 516         public function getCookieJar() {
 517                 if ( !$this->respHeaders ) {
 518                         $this->parseHeader();
 519                 }
 520
 521                 return $this->cookieJar;
 522         }
 523
 524         /**
 525          * Sets a cookie.  Used before a request to set up any individual
 526          * cookies.      Used internally after a request to parse the
 527          * Set-Cookie headers.
 528          * @see Cookie::set
 529          */
 530         public function setCookie( $name, $value = null, $attr = null ) {
 531                 if ( !$this->cookieJar ) {
 532                         $this->cookieJar = new CookieJar;
 533                 }
 534
 535                 $this->cookieJar->setCookie( $name, $value, $attr );
 536         }
 537
 538         /**
 539          * Parse the cookies in the response headers and store them in the cookie jar.
 540          */
 541         protected function parseCookies() {
 542                 if ( !$this->cookieJar ) {
 543                         $this->cookieJar = new CookieJar;
 544                 }
 545
 546                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 547                         $url = parse_url( $this->getFinalUrl() );
 548                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 549                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 550                         }
 551                 }
 552         }
 553
 554         /**
 555          * Returns the final URL after all redirections.
 556          *
 557          * @return String
 558          */
 559         public function getFinalUrl() {
 560                 $location = $this->getResponseHeader( "Location" );
 561
 562                 if ( $location ) {
 563                         return $location;
 564                 }
 565
 566                 return $this->url;
 567         }
 568
 569         /**
 570          * Returns true if the backend can follow redirects. Overridden by the
 571          * child classes.
 572          */
 573         public function canFollowRedirects() {
 574                 return true;
 575         }
 576 }
 577
 578 /**
 579  * MWHttpRequest implemented using internal curl compiled into PHP
 580  */
 581 class CurlHttpRequest extends MWHttpRequest {
 582         const SUPPORTS_FILE_POSTS = true;
 583
 584         static $curlMessageMap = array(
 585                 6 => 'http-host-unreachable',
 586                 28 => 'http-timed-out'
 587         );
 588
 589         protected $curlOptions = array();
 590         protected $headerText = "";
 591
 592         protected function readHeader( $fh, $content ) {
 593                 $this->headerText .= $content;
 594                 return strlen( $content );
 595         }
 596
 597         public function execute() {
 598                 parent::execute();
 599
 600                 if ( !$this->status->isOK() ) {
 601                         return $this->status;
 602                 }
 603
 604                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 605                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 606                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 607                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 608                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 609                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 610                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 611
 612                 /* not sure these two are actually necessary */
 613                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 614                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 615                 }
 616                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 617
 618                 if ( isset( $this->sslVerifyHost ) ) {
 619                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 620                 }
 621
 622                 if ( isset( $this->sslVerifyCert ) ) {
 623                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 624                 }
 625
 626                 if ( $this->caInfo ) {
 627                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 628                 }
 629
 630                 if ( $this->headersOnly ) {
 631                         $this->curlOptions[CURLOPT_NOBODY] = true;
 632                         $this->curlOptions[CURLOPT_HEADER] = true;
 633                 } elseif ( $this->method == 'POST' ) {
 634                         $this->curlOptions[CURLOPT_POST] = true;
 635                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 636                         // Suppress 'Expect: 100-continue' header, as some servers
 637                         // will reject it with a 417 and Curl won't auto retry
 638                         // with HTTP 1.0 fallback
 639                         $this->reqHeaders['Expect'] = '';
 640                 } else {
 641                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 642                 }
 643
 644                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 645
 646                 $curlHandle = curl_init( $this->url );
 647
 648                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 649                         throw new MWException( "Error setting curl options." );
 650                 }
 651
 652                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 653                         wfSuppressWarnings();
 654                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 655                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 656                                         "Probably safe_mode or open_basedir is set.\n" );
 657                                 // Continue the processing. If it were in curl_setopt_array,
 658                                 // processing would have halted on its entry
 659                         }
 660                         wfRestoreWarnings();
 661                 }
 662
 663                 if ( false === curl_exec( $curlHandle ) ) {
 664                         $code = curl_error( $curlHandle );
 665
 666                         if ( isset( self::$curlMessageMap[$code] ) ) {
 667                                 $this->status->fatal( self::$curlMessageMap[$code] );
 668                         } else {
 669                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 670                         }
 671                 } else {
 672                         $this->headerList = explode( "\r\n", $this->headerText );
 673                 }
 674
 675                 curl_close( $curlHandle );
 676
 677                 $this->parseHeader();
 678                 $this->setStatus();
 679
 680                 return $this->status;
 681         }
 682
 683         public function canFollowRedirects() {
 684                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 685                         wfDebug( "Cannot follow redirects in safe mode\n" );
 686                         return false;
 687                 }
 688
 689                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 690                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 691                         return false;
 692                 }
 693
 694                 return true;
 695         }
 696 }
 697
 698 class PhpHttpRequest extends MWHttpRequest {
 699         protected function urlToTcp( $url ) {
 700                 $parsedUrl = parse_url( $url );
 701
 702                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 703         }
 704
 705         public function execute() {
 706                 parent::execute();
 707
 708                 if ( is_array( $this->postData ) ) {
 709                         $this->postData = wfArrayToCGI( $this->postData );
 710                 }
 711
 712                 if ( $this->parsedUrl['scheme'] != 'http' ) {
 713                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 714                 }
 715
 716                 $this->reqHeaders['Accept'] = "*/*";
 717                 if ( $this->method == 'POST' ) {
 718                         // Required for HTTP 1.0 POSTs
 719                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 720                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 721                 }
 722
 723                 $options = array();
 724                 if ( $this->proxy && !$this->noProxy ) {
 725                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 726                         $options['request_fulluri'] = true;
 727                 }
 728
 729                 if ( !$this->followRedirects ) {
 730                         $options['max_redirects'] = 0;
 731                 } else {
 732                         $options['max_redirects'] = $this->maxRedirects;
 733                 }
 734
 735                 $options['method'] = $this->method;
 736                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 737                 // Note that at some future point we may want to support
 738                 // HTTP/1.1, but we'd have to write support for chunking
 739                 // in version of PHP < 5.3.1
 740                 $options['protocol_version'] = "1.0";
 741
 742                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 743                 // Only works on 5.2.10+
 744                 $options['ignore_errors'] = true;
 745
 746                 if ( $this->postData ) {
 747                         $options['content'] = $this->postData;
 748                 }
 749
 750                 $options['timeout'] = $this->timeout;
 751
 752                 $context = stream_context_create( array( 'http' => $options ) );
 753
 754                 $this->headerList = array();
 755                 $reqCount = 0;
 756                 $url = $this->url;
 757
 758                 $result = array();
 759
 760                 do {
 761                         $reqCount++;
 762                         wfSuppressWarnings();
 763                         $fh = fopen( $url, "r", false, $context );
 764                         wfRestoreWarnings();
 765
 766                         if ( !$fh ) {
 767                                 break;
 768                         }
 769
 770                         $result = stream_get_meta_data( $fh );
 771                         $this->headerList = $result['wrapper_data'];
 772                         $this->parseHeader();
 773
 774                         if ( !$this->followRedirects ) {
 775                                 break;
 776                         }
 777
 778                         # Handle manual redirection
 779                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 780                                 break;
 781                         }
 782                         # Check security of URL
 783                         $url = $this->getResponseHeader( "Location" );
 784
 785                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 786                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 787                                 break;
 788                         }
 789                 } while ( true );
 790
 791                 $this->setStatus();
 792
 793                 if ( $fh === false ) {
 794                         $this->status->fatal( 'http-request-error' );
 795                         return $this->status;
 796                 }
 797
 798                 if ( $result['timed_out'] ) {
 799                         $this->status->fatal( 'http-timed-out', $this->url );
 800                         return $this->status;
 801                 }
 802
 803                 // If everything went OK, or we recieved some error code
 804                 // get the response body content.
 805                 if ( $this->status->isOK()
 806                                 || (int)$this->respStatus >= 300) {
 807                         while ( !feof( $fh ) ) {
 808                                 $buf = fread( $fh, 8192 );
 809
 810                                 if ( $buf === false ) {
 811                                         $this->status->fatal( 'http-read-error' );
 812                                         break;
 813                                 }
 814
 815                                 if ( strlen( $buf ) ) {
 816                                         call_user_func( $this->callback, $fh, $buf );
 817                                 }
 818                         }
 819                 }
 820                 fclose( $fh );
 821
 822                 return $this->status;
 823         }
 824 }