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          * @return string
  58          */
  59         public static function get( $url, $timeout = 'default', $options = array() ) {
  60                 $options['timeout'] = $timeout;
  61                 return Http::request( 'GET', $url, $options );
  62         }
  63
  64         /**
  65          * Simple wrapper for Http::request( 'POST' )
  66          * @see Http::request()
  67          *
  68          * @return string
  69          */
  70         public static function post( $url, $options = array() ) {
  71                 return Http::request( 'POST', $url, $options );
  72         }
  73
  74         /**
  75          * Check if the URL can be served by localhost
  76          *
  77          * @param $url String: full url to check
  78          * @return Boolean
  79          */
  80         public static function isLocalURL( $url ) {
  81                 global $wgCommandLineMode, $wgConf;
  82
  83                 if ( $wgCommandLineMode ) {
  84                         return false;
  85                 }
  86
  87                 // Extract host part
  88                 $matches = array();
  89                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
  90                         $host = $matches[1];
  91                         // Split up dotwise
  92                         $domainParts = explode( '.', $host );
  93                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
  94                         $domainParts = array_reverse( $domainParts );
  95
  96                         $domain = '';
  97                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
  98                                 $domainPart = $domainParts[$i];
  99                                 if ( $i == 0 ) {
 100                                         $domain = $domainPart;
 101                                 } else {
 102                                         $domain = $domainPart . '.' . $domain;
 103                                 }
 104
 105                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 106                                         return true;
 107                                 }
 108                         }
 109                 }
 110
 111                 return false;
 112         }
 113
 114         /**
 115          * A standard user-agent we can use for external requests.
 116          * @return String
 117          */
 118         public static function userAgent() {
 119                 global $wgVersion;
 120                 return "MediaWiki/$wgVersion";
 121         }
 122
 123         /**
 124          * Checks that the given URI is a valid one. Hardcoding the
 125          * protocols, because we only want protocols that both cURL
 126          * and php support.
 127          *
 128          * @fixme this is wildly inaccurate and fails to actually check most stuff
 129          *
 130          * @param $uri Mixed: URI to check for validity
 131          * @returns Boolean
 132          */
 133         public static function isValidURI( $uri ) {
 134                 return preg_match(
 135                         '/^https?:\/\/[^\/\s]\S*$/D',
 136                         $uri
 137                 );
 138         }
 139 }
 140
 141 /**
 142  * This wrapper class will call out to curl (if available) or fallback
 143  * to regular PHP if necessary for handling internal HTTP requests.
 144  *
 145  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 146  * PHP's HTTP extension.
 147  */
 148 class MWHttpRequest {
 149         const SUPPORTS_FILE_POSTS = false;
 150
 151         protected $content;
 152         protected $timeout = 'default';
 153         protected $headersOnly = null;
 154         protected $postData = null;
 155         protected $proxy = null;
 156         protected $noProxy = false;
 157         protected $sslVerifyHost = true;
 158         protected $sslVerifyCert = true;
 159         protected $caInfo = null;
 160         protected $method = "GET";
 161         protected $reqHeaders = array();
 162         protected $url;
 163         protected $parsedUrl;
 164         protected $callback;
 165         protected $maxRedirects = 5;
 166         protected $followRedirects = false;
 167
 168         /**
 169          * @var  CookieJar
 170          */
 171         protected $cookieJar;
 172
 173         protected $headerList = array();
 174         protected $respVersion = "0.9";
 175         protected $respStatus = "200 Ok";
 176         protected $respHeaders = array();
 177
 178         public $status;
 179
 180         /**
 181          * @param $url String: url to use
 182          * @param $options Array: (optional) extra params to pass (see Http::request())
 183          */
 184         function __construct( $url, $options = array() ) {
 185                 global $wgHTTPTimeout;
 186
 187                 $this->url = $url;
 188                 $this->parsedUrl = parse_url( $url );
 189
 190                 if ( !Http::isValidURI( $this->url ) ) {
 191                         $this->status = Status::newFatal( 'http-invalid-url' );
 192                 } else {
 193                         $this->status = Status::newGood( 100 ); // continue
 194                 }
 195
 196                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 197                         $this->timeout = $options['timeout'];
 198                 } else {
 199                         $this->timeout = $wgHTTPTimeout;
 200                 }
 201
 202                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 203                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 204
 205                 foreach ( $members as $o ) {
 206                         if ( isset( $options[$o] ) ) {
 207                                 $this->$o = $options[$o];
 208                         }
 209                 }
 210         }
 211
 212         /**
 213          * Generate a new request object
 214          * @param $url String: url to use
 215          * @param $options Array: (optional) extra params to pass (see Http::request())
 216          * @see MWHttpRequest::__construct
 217          */
 218         public static function factory( $url, $options = null ) {
 219                 if ( !Http::$httpEngine ) {
 220                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 221                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 222                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 223                                                                    ' Http::$httpEngine is set to "curl"' );
 224                 }
 225
 226                 switch( Http::$httpEngine ) {
 227                         case 'curl':
 228                                 return new CurlHttpRequest( $url, $options );
 229                         case 'php':
 230                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 231                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 232                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 233                                 }
 234                                 return new PhpHttpRequest( $url, $options );
 235                         default:
 236                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 237                 }
 238         }
 239
 240         /**
 241          * Get the body, or content, of the response to the request
 242          *
 243          * @return String
 244          */
 245         public function getContent() {
 246                 return $this->content;
 247         }
 248
 249         /**
 250          * Set the parameters of the request
 251
 252          * @param $args Array
 253          * @todo overload the args param
 254          */
 255         public function setData( $args ) {
 256                 $this->postData = $args;
 257         }
 258
 259         /**
 260          * Take care of setting up the proxy
 261          * (override in subclass)
 262          *
 263          * @return String
 264          */
 265         public function proxySetup() {
 266                 global $wgHTTPProxy;
 267
 268                 if ( $this->proxy ) {
 269                         return;
 270                 }
 271
 272                 if ( Http::isLocalURL( $this->url ) ) {
 273                         $this->proxy = 'http://localhost:80/';
 274                 } elseif ( $wgHTTPProxy ) {
 275                         $this->proxy = $wgHTTPProxy ;
 276                 } elseif ( getenv( "http_proxy" ) ) {
 277                         $this->proxy = getenv( "http_proxy" );
 278                 }
 279         }
 280
 281         /**
 282          * Set the refererer header
 283          */
 284         public function setReferer( $url ) {
 285                 $this->setHeader( 'Referer', $url );
 286         }
 287
 288         /**
 289          * Set the user agent
 290          */
 291         public function setUserAgent( $UA ) {
 292                 $this->setHeader( 'User-Agent', $UA );
 293         }
 294
 295         /**
 296          * Set an arbitrary header
 297          */
 298         public function setHeader( $name, $value ) {
 299                 // I feel like I should normalize the case here...
 300                 $this->reqHeaders[$name] = $value;
 301         }
 302
 303         /**
 304          * Get an array of the headers
 305          */
 306         public function getHeaderList() {
 307                 $list = array();
 308
 309                 if ( $this->cookieJar ) {
 310                         $this->reqHeaders['Cookie'] =
 311                                 $this->cookieJar->serializeToHttpRequest(
 312                                         $this->parsedUrl['path'],
 313                                         $this->parsedUrl['host']
 314                                 );
 315                 }
 316
 317                 foreach ( $this->reqHeaders as $name => $value ) {
 318                         $list[] = "$name: $value";
 319                 }
 320
 321                 return $list;
 322         }
 323
 324         /**
 325          * Set a read callback to accept data read from the HTTP request.
 326          * By default, data is appended to an internal buffer which can be
 327          * retrieved through $req->getContent().
 328          *
 329          * To handle data as it comes in -- especially for large files that
 330          * would not fit in memory -- you can instead set your own callback,
 331          * in the form function($resource, $buffer) where the first parameter
 332          * is the low-level resource being read (implementation specific),
 333          * and the second parameter is the data buffer.
 334          *
 335          * You MUST return the number of bytes handled in the buffer; if fewer
 336          * bytes are reported handled than were passed to you, the HTTP fetch
 337          * will be aborted.
 338          *
 339          * @param $callback Callback
 340          */
 341         public function setCallback( $callback ) {
 342                 if ( !is_callable( $callback ) ) {
 343                         throw new MWException( 'Invalid MwHttpRequest callback' );
 344                 }
 345                 $this->callback = $callback;
 346         }
 347
 348         /**
 349          * A generic callback to read the body of the response from a remote
 350          * server.
 351          *
 352          * @param $fh handle
 353          * @param $content String
 354          */
 355         public function read( $fh, $content ) {
 356                 $this->content .= $content;
 357                 return strlen( $content );
 358         }
 359
 360         /**
 361          * Take care of whatever is necessary to perform the URI request.
 362          *
 363          * @return Status
 364          */
 365         public function execute() {
 366                 global $wgTitle;
 367
 368                 $this->content = "";
 369
 370                 if ( strtoupper( $this->method ) == "HEAD" ) {
 371                         $this->headersOnly = true;
 372                 }
 373
 374                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 375                         $this->setReferer( $wgTitle->getFullURL() );
 376                 }
 377
 378                 if ( !$this->noProxy ) {
 379                         $this->proxySetup();
 380                 }
 381
 382                 if ( !$this->callback ) {
 383                         $this->setCallback( array( $this, 'read' ) );
 384                 }
 385
 386                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 387                         $this->setUserAgent( Http::userAgent() );
 388                 }
 389         }
 390
 391         /**
 392          * Parses the headers, including the HTTP status code and any
 393          * Set-Cookie headers.  This function expectes the headers to be
 394          * found in an array in the member variable headerList.
 395          *
 396          * @return nothing
 397          */
 398         protected function parseHeader() {
 399                 $lastname = "";
 400
 401                 foreach ( $this->headerList as $header ) {
 402                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 403                                 $this->respVersion = $match[1];
 404                                 $this->respStatus = $match[2];
 405                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 406                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 407                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 408                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 409                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 410                                 $lastname = strtolower( $match[1] );
 411                         }
 412                 }
 413
 414                 $this->parseCookies();
 415         }
 416
 417         /**
 418          * Sets HTTPRequest status member to a fatal value with the error
 419          * message if the returned integer value of the status code was
 420          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 421          * RFC2616, section 10,
 422          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 423          * list of status codes.)
 424          *
 425          * @return nothing
 426          */
 427         protected function setStatus() {
 428                 if ( !$this->respHeaders ) {
 429                         $this->parseHeader();
 430                 }
 431
 432                 if ( (int)$this->respStatus > 399 ) {
 433                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 434                         $this->status->fatal( "http-bad-status", $code, $message );
 435                 }
 436         }
 437
 438         /**
 439          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 440          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 441          * for a list of status codes.)
 442          *
 443          * @return Integer
 444          */
 445         public function getStatus() {
 446                 if ( !$this->respHeaders ) {
 447                         $this->parseHeader();
 448                 }
 449
 450                 return (int)$this->respStatus;
 451         }
 452
 453
 454         /**
 455          * Returns true if the last status code was a redirect.
 456          *
 457          * @return Boolean
 458          */
 459         public function isRedirect() {
 460                 if ( !$this->respHeaders ) {
 461                         $this->parseHeader();
 462                 }
 463
 464                 $status = (int)$this->respStatus;
 465
 466                 if ( $status >= 300 && $status <= 303 ) {
 467                         return true;
 468                 }
 469
 470                 return false;
 471         }
 472
 473         /**
 474          * Returns an associative array of response headers after the
 475          * request has been executed.  Because some headers
 476          * (e.g. Set-Cookie) can appear more than once the, each value of
 477          * the associative array is an array of the values given.
 478          *
 479          * @return Array
 480          */
 481         public function getResponseHeaders() {
 482                 if ( !$this->respHeaders ) {
 483                         $this->parseHeader();
 484                 }
 485
 486                 return $this->respHeaders;
 487         }
 488
 489         /**
 490          * Returns the value of the given response header.
 491          *
 492          * @param $header String
 493          * @return String
 494          */
 495         public function getResponseHeader( $header ) {
 496                 if ( !$this->respHeaders ) {
 497                         $this->parseHeader();
 498                 }
 499
 500                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 501                         $v = $this->respHeaders[strtolower ( $header ) ];
 502                         return $v[count( $v ) - 1];
 503                 }
 504
 505                 return null;
 506         }
 507
 508         /**
 509          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 510          *
 511          * @param $jar CookieJar
 512          */
 513         public function setCookieJar( $jar ) {
 514                 $this->cookieJar = $jar;
 515         }
 516
 517         /**
 518          * Returns the cookie jar in use.
 519          *
 520          * @returns CookieJar
 521          */
 522         public function getCookieJar() {
 523                 if ( !$this->respHeaders ) {
 524                         $this->parseHeader();
 525                 }
 526
 527                 return $this->cookieJar;
 528         }
 529
 530         /**
 531          * Sets a cookie.  Used before a request to set up any individual
 532          * cookies.      Used internally after a request to parse the
 533          * Set-Cookie headers.
 534          * @see Cookie::set
 535          */
 536         public function setCookie( $name, $value = null, $attr = null ) {
 537                 if ( !$this->cookieJar ) {
 538                         $this->cookieJar = new CookieJar;
 539                 }
 540
 541                 $this->cookieJar->setCookie( $name, $value, $attr );
 542         }
 543
 544         /**
 545          * Parse the cookies in the response headers and store them in the cookie jar.
 546          */
 547         protected function parseCookies() {
 548                 if ( !$this->cookieJar ) {
 549                         $this->cookieJar = new CookieJar;
 550                 }
 551
 552                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 553                         $url = parse_url( $this->getFinalUrl() );
 554                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 555                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 556                         }
 557                 }
 558         }
 559
 560         /**
 561          * Returns the final URL after all redirections.
 562          *
 563          * @return String
 564          */
 565         public function getFinalUrl() {
 566                 $location = $this->getResponseHeader( "Location" );
 567
 568                 if ( $location ) {
 569                         return $location;
 570                 }
 571
 572                 return $this->url;
 573         }
 574
 575         /**
 576          * Returns true if the backend can follow redirects. Overridden by the
 577          * child classes.
 578          */
 579         public function canFollowRedirects() {
 580                 return true;
 581         }
 582 }
 583
 584 /**
 585  * MWHttpRequest implemented using internal curl compiled into PHP
 586  */
 587 class CurlHttpRequest extends MWHttpRequest {
 588         const SUPPORTS_FILE_POSTS = true;
 589
 590         static $curlMessageMap = array(
 591                 6 => 'http-host-unreachable',
 592                 28 => 'http-timed-out'
 593         );
 594
 595         protected $curlOptions = array();
 596         protected $headerText = "";
 597
 598         protected function readHeader( $fh, $content ) {
 599                 $this->headerText .= $content;
 600                 return strlen( $content );
 601         }
 602
 603         public function execute() {
 604                 parent::execute();
 605
 606                 if ( !$this->status->isOK() ) {
 607                         return $this->status;
 608                 }
 609
 610                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 611                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 612                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 613                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 614                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 615                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 616                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 617
 618                 /* not sure these two are actually necessary */
 619                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 620                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 621                 }
 622                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 623
 624                 if ( isset( $this->sslVerifyHost ) ) {
 625                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 626                 }
 627
 628                 if ( isset( $this->sslVerifyCert ) ) {
 629                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 630                 }
 631
 632                 if ( $this->caInfo ) {
 633                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 634                 }
 635
 636                 if ( $this->headersOnly ) {
 637                         $this->curlOptions[CURLOPT_NOBODY] = true;
 638                         $this->curlOptions[CURLOPT_HEADER] = true;
 639                 } elseif ( $this->method == 'POST' ) {
 640                         $this->curlOptions[CURLOPT_POST] = true;
 641                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 642                         // Suppress 'Expect: 100-continue' header, as some servers
 643                         // will reject it with a 417 and Curl won't auto retry
 644                         // with HTTP 1.0 fallback
 645                         $this->reqHeaders['Expect'] = '';
 646                 } else {
 647                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 648                 }
 649
 650                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 651
 652                 $curlHandle = curl_init( $this->url );
 653
 654                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 655                         throw new MWException( "Error setting curl options." );
 656                 }
 657
 658                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 659                         wfSuppressWarnings();
 660                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 661                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 662                                         "Probably safe_mode or open_basedir is set.\n" );
 663                                 // Continue the processing. If it were in curl_setopt_array,
 664                                 // processing would have halted on its entry
 665                         }
 666                         wfRestoreWarnings();
 667                 }
 668
 669                 if ( false === curl_exec( $curlHandle ) ) {
 670                         $code = curl_error( $curlHandle );
 671
 672                         if ( isset( self::$curlMessageMap[$code] ) ) {
 673                                 $this->status->fatal( self::$curlMessageMap[$code] );
 674                         } else {
 675                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 676                         }
 677                 } else {
 678                         $this->headerList = explode( "\r\n", $this->headerText );
 679                 }
 680
 681                 curl_close( $curlHandle );
 682
 683                 $this->parseHeader();
 684                 $this->setStatus();
 685
 686                 return $this->status;
 687         }
 688
 689         public function canFollowRedirects() {
 690                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 691                         wfDebug( "Cannot follow redirects in safe mode\n" );
 692                         return false;
 693                 }
 694
 695                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 696                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 697                         return false;
 698                 }
 699
 700                 return true;
 701         }
 702 }
 703
 704 class PhpHttpRequest extends MWHttpRequest {
 705         protected function urlToTcp( $url ) {
 706                 $parsedUrl = parse_url( $url );
 707
 708                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 709         }
 710
 711         public function execute() {
 712                 parent::execute();
 713
 714                 if ( is_array( $this->postData ) ) {
 715                         $this->postData = wfArrayToCGI( $this->postData );
 716                 }
 717
 718                 if ( $this->parsedUrl['scheme'] != 'http' &&
 719                          $this->parsedUrl['scheme'] != 'https' ) {
 720                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 721                 }
 722
 723                 $this->reqHeaders['Accept'] = "*/*";
 724                 if ( $this->method == 'POST' ) {
 725                         // Required for HTTP 1.0 POSTs
 726                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 727                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 728                 }
 729
 730                 $options = array();
 731                 if ( $this->proxy && !$this->noProxy ) {
 732                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 733                         $options['request_fulluri'] = true;
 734                 }
 735
 736                 if ( !$this->followRedirects ) {
 737                         $options['max_redirects'] = 0;
 738                 } else {
 739                         $options['max_redirects'] = $this->maxRedirects;
 740                 }
 741
 742                 $options['method'] = $this->method;
 743                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 744                 // Note that at some future point we may want to support
 745                 // HTTP/1.1, but we'd have to write support for chunking
 746                 // in version of PHP < 5.3.1
 747                 $options['protocol_version'] = "1.0";
 748
 749                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 750                 // Only works on 5.2.10+
 751                 $options['ignore_errors'] = true;
 752
 753                 if ( $this->postData ) {
 754                         $options['content'] = $this->postData;
 755                 }
 756
 757                 $options['timeout'] = $this->timeout;
 758
 759                 $context = stream_context_create( array( 'http' => $options ) );
 760
 761                 $this->headerList = array();
 762                 $reqCount = 0;
 763                 $url = $this->url;
 764
 765                 $result = array();
 766
 767                 do {
 768                         $reqCount++;
 769                         wfSuppressWarnings();
 770                         $fh = fopen( $url, "r", false, $context );
 771                         wfRestoreWarnings();
 772
 773                         if ( !$fh ) {
 774                                 break;
 775                         }
 776
 777                         $result = stream_get_meta_data( $fh );
 778                         $this->headerList = $result['wrapper_data'];
 779                         $this->parseHeader();
 780
 781                         if ( !$this->followRedirects ) {
 782                                 break;
 783                         }
 784
 785                         # Handle manual redirection
 786                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 787                                 break;
 788                         }
 789                         # Check security of URL
 790                         $url = $this->getResponseHeader( "Location" );
 791
 792                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 793                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 794                                 break;
 795                         }
 796                 } while ( true );
 797
 798                 $this->setStatus();
 799
 800                 if ( $fh === false ) {
 801                         $this->status->fatal( 'http-request-error' );
 802                         return $this->status;
 803                 }
 804
 805                 if ( $result['timed_out'] ) {
 806                         $this->status->fatal( 'http-timed-out', $this->url );
 807                         return $this->status;
 808                 }
 809
 810                 // If everything went OK, or we recieved some error code
 811                 // get the response body content.
 812                 if ( $this->status->isOK()
 813                                 || (int)$this->respStatus >= 300) {
 814                         while ( !feof( $fh ) ) {
 815                                 $buf = fread( $fh, 8192 );
 816
 817                                 if ( $buf === false ) {
 818                                         $this->status->fatal( 'http-read-error' );
 819                                         break;
 820                                 }
 821
 822                                 if ( strlen( $buf ) ) {
 823                                         call_user_func( $this->callback, $fh, $buf );
 824                                 }
 825                         }
 826                 }
 827                 fclose( $fh );
 828
 829                 return $this->status;
 830         }
 831 }