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 the callback
 320          *
 321          * @param $callback Callback
 322          */
 323         public function setCallback( $callback ) {
 324                 $this->callback = $callback;
 325         }
 326
 327         /**
 328          * A generic callback to read the body of the response from a remote
 329          * server.
 330          *
 331          * @param $fh handle
 332          * @param $content String
 333          */
 334         public function read( $fh, $content ) {
 335                 $this->content .= $content;
 336                 return strlen( $content );
 337         }
 338
 339         /**
 340          * Take care of whatever is necessary to perform the URI request.
 341          *
 342          * @return Status
 343          */
 344         public function execute() {
 345                 global $wgTitle;
 346
 347                 $this->content = "";
 348
 349                 if ( strtoupper( $this->method ) == "HEAD" ) {
 350                         $this->headersOnly = true;
 351                 }
 352
 353                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 354                         $this->setReferer( $wgTitle->getFullURL() );
 355                 }
 356
 357                 if ( !$this->noProxy ) {
 358                         $this->proxySetup();
 359                 }
 360
 361                 if ( !$this->callback ) {
 362                         $this->setCallback( array( $this, 'read' ) );
 363                 }
 364
 365                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 366                         $this->setUserAgent( Http::userAgent() );
 367                 }
 368         }
 369
 370         /**
 371          * Parses the headers, including the HTTP status code and any
 372          * Set-Cookie headers.  This function expectes the headers to be
 373          * found in an array in the member variable headerList.
 374          *
 375          * @return nothing
 376          */
 377         protected function parseHeader() {
 378                 $lastname = "";
 379
 380                 foreach ( $this->headerList as $header ) {
 381                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 382                                 $this->respVersion = $match[1];
 383                                 $this->respStatus = $match[2];
 384                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 385                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 386                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 387                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 388                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 389                                 $lastname = strtolower( $match[1] );
 390                         }
 391                 }
 392
 393                 $this->parseCookies();
 394         }
 395
 396         /**
 397          * Sets HTTPRequest status member to a fatal value with the error
 398          * message if the returned integer value of the status code was
 399          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 400          * RFC2616, section 10,
 401          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 402          * list of status codes.)
 403          *
 404          * @return nothing
 405          */
 406         protected function setStatus() {
 407                 if ( !$this->respHeaders ) {
 408                         $this->parseHeader();
 409                 }
 410
 411                 if ( (int)$this->respStatus > 399 ) {
 412                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 413                         $this->status->fatal( "http-bad-status", $code, $message );
 414                 }
 415         }
 416
 417         /**
 418          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 419          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 420          * for a list of status codes.)
 421          *
 422          * @return Integer
 423          */
 424         public function getStatus() {
 425                 if ( !$this->respHeaders ) {
 426                         $this->parseHeader();
 427                 }
 428
 429                 return (int)$this->respStatus;
 430         }
 431
 432
 433         /**
 434          * Returns true if the last status code was a redirect.
 435          *
 436          * @return Boolean
 437          */
 438         public function isRedirect() {
 439                 if ( !$this->respHeaders ) {
 440                         $this->parseHeader();
 441                 }
 442
 443                 $status = (int)$this->respStatus;
 444
 445                 if ( $status >= 300 && $status <= 303 ) {
 446                         return true;
 447                 }
 448
 449                 return false;
 450         }
 451
 452         /**
 453          * Returns an associative array of response headers after the
 454          * request has been executed.  Because some headers
 455          * (e.g. Set-Cookie) can appear more than once the, each value of
 456          * the associative array is an array of the values given.
 457          *
 458          * @return Array
 459          */
 460         public function getResponseHeaders() {
 461                 if ( !$this->respHeaders ) {
 462                         $this->parseHeader();
 463                 }
 464
 465                 return $this->respHeaders;
 466         }
 467
 468         /**
 469          * Returns the value of the given response header.
 470          *
 471          * @param $header String
 472          * @return String
 473          */
 474         public function getResponseHeader( $header ) {
 475                 if ( !$this->respHeaders ) {
 476                         $this->parseHeader();
 477                 }
 478
 479                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 480                         $v = $this->respHeaders[strtolower ( $header ) ];
 481                         return $v[count( $v ) - 1];
 482                 }
 483
 484                 return null;
 485         }
 486
 487         /**
 488          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 489          *
 490          * @param $jar CookieJar
 491          */
 492         public function setCookieJar( $jar ) {
 493                 $this->cookieJar = $jar;
 494         }
 495
 496         /**
 497          * Returns the cookie jar in use.
 498          *
 499          * @returns CookieJar
 500          */
 501         public function getCookieJar() {
 502                 if ( !$this->respHeaders ) {
 503                         $this->parseHeader();
 504                 }
 505
 506                 return $this->cookieJar;
 507         }
 508
 509         /**
 510          * Sets a cookie.  Used before a request to set up any individual
 511          * cookies.      Used internally after a request to parse the
 512          * Set-Cookie headers.
 513          * @see Cookie::set
 514          */
 515         public function setCookie( $name, $value = null, $attr = null ) {
 516                 if ( !$this->cookieJar ) {
 517                         $this->cookieJar = new CookieJar;
 518                 }
 519
 520                 $this->cookieJar->setCookie( $name, $value, $attr );
 521         }
 522
 523         /**
 524          * Parse the cookies in the response headers and store them in the cookie jar.
 525          */
 526         protected function parseCookies() {
 527                 if ( !$this->cookieJar ) {
 528                         $this->cookieJar = new CookieJar;
 529                 }
 530
 531                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 532                         $url = parse_url( $this->getFinalUrl() );
 533                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 534                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 535                         }
 536                 }
 537         }
 538
 539         /**
 540          * Returns the final URL after all redirections.
 541          *
 542          * @return String
 543          */
 544         public function getFinalUrl() {
 545                 $location = $this->getResponseHeader( "Location" );
 546
 547                 if ( $location ) {
 548                         return $location;
 549                 }
 550
 551                 return $this->url;
 552         }
 553
 554         /**
 555          * Returns true if the backend can follow redirects. Overridden by the
 556          * child classes.
 557          */
 558         public function canFollowRedirects() {
 559                 return true;
 560         }
 561 }
 562
 563 /**
 564  * MWHttpRequest implemented using internal curl compiled into PHP
 565  */
 566 class CurlHttpRequest extends MWHttpRequest {
 567         const SUPPORTS_FILE_POSTS = true;
 568
 569         static $curlMessageMap = array(
 570                 6 => 'http-host-unreachable',
 571                 28 => 'http-timed-out'
 572         );
 573
 574         protected $curlOptions = array();
 575         protected $headerText = "";
 576
 577         protected function readHeader( $fh, $content ) {
 578                 $this->headerText .= $content;
 579                 return strlen( $content );
 580         }
 581
 582         public function execute() {
 583                 parent::execute();
 584
 585                 if ( !$this->status->isOK() ) {
 586                         return $this->status;
 587                 }
 588
 589                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 590                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 591                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 592                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 593                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 594                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 595                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 596
 597                 /* not sure these two are actually necessary */
 598                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 599                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 600                 }
 601                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 602
 603                 if ( isset( $this->sslVerifyHost ) ) {
 604                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 605                 }
 606
 607                 if ( isset( $this->sslVerifyCert ) ) {
 608                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 609                 }
 610
 611                 if ( $this->caInfo ) {
 612                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 613                 }
 614
 615                 if ( $this->headersOnly ) {
 616                         $this->curlOptions[CURLOPT_NOBODY] = true;
 617                         $this->curlOptions[CURLOPT_HEADER] = true;
 618                 } elseif ( $this->method == 'POST' ) {
 619                         $this->curlOptions[CURLOPT_POST] = true;
 620                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 621                         // Suppress 'Expect: 100-continue' header, as some servers
 622                         // will reject it with a 417 and Curl won't auto retry
 623                         // with HTTP 1.0 fallback
 624                         $this->reqHeaders['Expect'] = '';
 625                 } else {
 626                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 627                 }
 628
 629                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 630
 631                 $curlHandle = curl_init( $this->url );
 632
 633                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 634                         throw new MWException( "Error setting curl options." );
 635                 }
 636
 637                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 638                         wfSuppressWarnings();
 639                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 640                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 641                                         "Probably safe_mode or open_basedir is set.\n" );
 642                                 // Continue the processing. If it were in curl_setopt_array,
 643                                 // processing would have halted on its entry
 644                         }
 645                         wfRestoreWarnings();
 646                 }
 647
 648                 if ( false === curl_exec( $curlHandle ) ) {
 649                         $code = curl_error( $curlHandle );
 650
 651                         if ( isset( self::$curlMessageMap[$code] ) ) {
 652                                 $this->status->fatal( self::$curlMessageMap[$code] );
 653                         } else {
 654                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 655                         }
 656                 } else {
 657                         $this->headerList = explode( "\r\n", $this->headerText );
 658                 }
 659
 660                 curl_close( $curlHandle );
 661
 662                 $this->parseHeader();
 663                 $this->setStatus();
 664
 665                 return $this->status;
 666         }
 667
 668         public function canFollowRedirects() {
 669                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 670                         wfDebug( "Cannot follow redirects in safe mode\n" );
 671                         return false;
 672                 }
 673
 674                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 675                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 676                         return false;
 677                 }
 678
 679                 return true;
 680         }
 681 }
 682
 683 class PhpHttpRequest extends MWHttpRequest {
 684         protected function urlToTcp( $url ) {
 685                 $parsedUrl = parse_url( $url );
 686
 687                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 688         }
 689
 690         public function execute() {
 691                 parent::execute();
 692
 693                 if ( is_array( $this->postData ) ) {
 694                         $this->postData = wfArrayToCGI( $this->postData );
 695                 }
 696
 697                 if ( $this->parsedUrl['scheme'] != 'http' ) {
 698                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 699                 }
 700
 701                 $this->reqHeaders['Accept'] = "*/*";
 702                 if ( $this->method == 'POST' ) {
 703                         // Required for HTTP 1.0 POSTs
 704                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 705                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 706                 }
 707
 708                 $options = array();
 709                 if ( $this->proxy && !$this->noProxy ) {
 710                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 711                         $options['request_fulluri'] = true;
 712                 }
 713
 714                 if ( !$this->followRedirects ) {
 715                         $options['max_redirects'] = 0;
 716                 } else {
 717                         $options['max_redirects'] = $this->maxRedirects;
 718                 }
 719
 720                 $options['method'] = $this->method;
 721                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 722                 // Note that at some future point we may want to support
 723                 // HTTP/1.1, but we'd have to write support for chunking
 724                 // in version of PHP < 5.3.1
 725                 $options['protocol_version'] = "1.0";
 726
 727                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 728                 // Only works on 5.2.10+
 729                 $options['ignore_errors'] = true;
 730
 731                 if ( $this->postData ) {
 732                         $options['content'] = $this->postData;
 733                 }
 734
 735                 $options['timeout'] = $this->timeout;
 736
 737                 $context = stream_context_create( array( 'http' => $options ) );
 738
 739                 $this->headerList = array();
 740                 $reqCount = 0;
 741                 $url = $this->url;
 742
 743                 $result = array();
 744
 745                 do {
 746                         $reqCount++;
 747                         wfSuppressWarnings();
 748                         $fh = fopen( $url, "r", false, $context );
 749                         wfRestoreWarnings();
 750
 751                         if ( !$fh ) {
 752                                 break;
 753                         }
 754
 755                         $result = stream_get_meta_data( $fh );
 756                         $this->headerList = $result['wrapper_data'];
 757                         $this->parseHeader();
 758
 759                         if ( !$this->followRedirects ) {
 760                                 break;
 761                         }
 762
 763                         # Handle manual redirection
 764                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 765                                 break;
 766                         }
 767                         # Check security of URL
 768                         $url = $this->getResponseHeader( "Location" );
 769
 770                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 771                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 772                                 break;
 773                         }
 774                 } while ( true );
 775
 776                 $this->setStatus();
 777
 778                 if ( $fh === false ) {
 779                         $this->status->fatal( 'http-request-error' );
 780                         return $this->status;
 781                 }
 782
 783                 if ( $result['timed_out'] ) {
 784                         $this->status->fatal( 'http-timed-out', $this->url );
 785                         return $this->status;
 786                 }
 787
 788                 if ( $this->status->isOK() ) {
 789                         while ( !feof( $fh ) ) {
 790                                 $buf = fread( $fh, 8192 );
 791
 792                                 if ( $buf === false ) {
 793                                         $this->status->fatal( 'http-read-error' );
 794                                         break;
 795                                 }
 796
 797                                 if ( strlen( $buf ) ) {
 798                                         call_user_func( $this->callback, $fh, $buf );
 799                                 }
 800                         }
 801                 }
 802                 fclose( $fh );
 803
 804                 return $this->status;
 805         }
 806 }