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