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. If protocol-relative, will be expanded to an http:// URL
  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, PROTO_HTTP );
  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          * Simple function to test if we can make any sort of requests at all, using
 214          * cURL or fopen()
 215          * @return bool
 216          */
 217         public static function canMakeRequests() {
 218                 return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
 219         }
 220
 221         /**
 222          * Generate a new request object
 223          * @param $url String: url to use
 224          * @param $options Array: (optional) extra params to pass (see Http::request())
 225          * @see MWHttpRequest::__construct
 226          */
 227         public static function factory( $url, $options = null ) {
 228                 if ( !Http::$httpEngine ) {
 229                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 230                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 231                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 232                                                                    ' Http::$httpEngine is set to "curl"' );
 233                 }
 234
 235                 switch( Http::$httpEngine ) {
 236                         case 'curl':
 237                                 return new CurlHttpRequest( $url, $options );
 238                         case 'php':
 239                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 240                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 241                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 242                                 }
 243                                 return new PhpHttpRequest( $url, $options );
 244                         default:
 245                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 246                 }
 247         }
 248
 249         /**
 250          * Get the body, or content, of the response to the request
 251          *
 252          * @return String
 253          */
 254         public function getContent() {
 255                 return $this->content;
 256         }
 257
 258         /**
 259          * Set the parameters of the request
 260
 261          * @param $args Array
 262          * @todo overload the args param
 263          */
 264         public function setData( $args ) {
 265                 $this->postData = $args;
 266         }
 267
 268         /**
 269          * Take care of setting up the proxy
 270          * (override in subclass)
 271          *
 272          * @return String
 273          */
 274         public function proxySetup() {
 275                 global $wgHTTPProxy;
 276
 277                 if ( $this->proxy ) {
 278                         return;
 279                 }
 280
 281                 if ( Http::isLocalURL( $this->url ) ) {
 282                         $this->proxy = 'http://localhost:80/';
 283                 } elseif ( $wgHTTPProxy ) {
 284                         $this->proxy = $wgHTTPProxy ;
 285                 } elseif ( getenv( "http_proxy" ) ) {
 286                         $this->proxy = getenv( "http_proxy" );
 287                 }
 288         }
 289
 290         /**
 291          * Set the refererer header
 292          */
 293         public function setReferer( $url ) {
 294                 $this->setHeader( 'Referer', $url );
 295         }
 296
 297         /**
 298          * Set the user agent
 299          */
 300         public function setUserAgent( $UA ) {
 301                 $this->setHeader( 'User-Agent', $UA );
 302         }
 303
 304         /**
 305          * Set an arbitrary header
 306          */
 307         public function setHeader( $name, $value ) {
 308                 // I feel like I should normalize the case here...
 309                 $this->reqHeaders[$name] = $value;
 310         }
 311
 312         /**
 313          * Get an array of the headers
 314          */
 315         public function getHeaderList() {
 316                 $list = array();
 317
 318                 if ( $this->cookieJar ) {
 319                         $this->reqHeaders['Cookie'] =
 320                                 $this->cookieJar->serializeToHttpRequest(
 321                                         $this->parsedUrl['path'],
 322                                         $this->parsedUrl['host']
 323                                 );
 324                 }
 325
 326                 foreach ( $this->reqHeaders as $name => $value ) {
 327                         $list[] = "$name: $value";
 328                 }
 329
 330                 return $list;
 331         }
 332
 333         /**
 334          * Set a read callback to accept data read from the HTTP request.
 335          * By default, data is appended to an internal buffer which can be
 336          * retrieved through $req->getContent().
 337          *
 338          * To handle data as it comes in -- especially for large files that
 339          * would not fit in memory -- you can instead set your own callback,
 340          * in the form function($resource, $buffer) where the first parameter
 341          * is the low-level resource being read (implementation specific),
 342          * and the second parameter is the data buffer.
 343          *
 344          * You MUST return the number of bytes handled in the buffer; if fewer
 345          * bytes are reported handled than were passed to you, the HTTP fetch
 346          * will be aborted.
 347          *
 348          * @param $callback Callback
 349          */
 350         public function setCallback( $callback ) {
 351                 if ( !is_callable( $callback ) ) {
 352                         throw new MWException( 'Invalid MwHttpRequest callback' );
 353                 }
 354                 $this->callback = $callback;
 355         }
 356
 357         /**
 358          * A generic callback to read the body of the response from a remote
 359          * server.
 360          *
 361          * @param $fh handle
 362          * @param $content String
 363          */
 364         public function read( $fh, $content ) {
 365                 $this->content .= $content;
 366                 return strlen( $content );
 367         }
 368
 369         /**
 370          * Take care of whatever is necessary to perform the URI request.
 371          *
 372          * @return Status
 373          */
 374         public function execute() {
 375                 global $wgTitle;
 376
 377                 $this->content = "";
 378
 379                 if ( strtoupper( $this->method ) == "HEAD" ) {
 380                         $this->headersOnly = true;
 381                 }
 382
 383                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 384                         $this->setReferer( $wgTitle->getFullURL() );
 385                 }
 386
 387                 if ( !$this->noProxy ) {
 388                         $this->proxySetup();
 389                 }
 390
 391                 if ( !$this->callback ) {
 392                         $this->setCallback( array( $this, 'read' ) );
 393                 }
 394
 395                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 396                         $this->setUserAgent( Http::userAgent() );
 397                 }
 398         }
 399
 400         /**
 401          * Parses the headers, including the HTTP status code and any
 402          * Set-Cookie headers.  This function expectes the headers to be
 403          * found in an array in the member variable headerList.
 404          *
 405          * @return nothing
 406          */
 407         protected function parseHeader() {
 408                 $lastname = "";
 409
 410                 foreach ( $this->headerList as $header ) {
 411                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 412                                 $this->respVersion = $match[1];
 413                                 $this->respStatus = $match[2];
 414                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 415                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 416                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 417                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 418                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 419                                 $lastname = strtolower( $match[1] );
 420                         }
 421                 }
 422
 423                 $this->parseCookies();
 424         }
 425
 426         /**
 427          * Sets HTTPRequest status member to a fatal value with the error
 428          * message if the returned integer value of the status code was
 429          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 430          * RFC2616, section 10,
 431          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 432          * list of status codes.)
 433          *
 434          * @return nothing
 435          */
 436         protected function setStatus() {
 437                 if ( !$this->respHeaders ) {
 438                         $this->parseHeader();
 439                 }
 440
 441                 if ( (int)$this->respStatus > 399 ) {
 442                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 443                         $this->status->fatal( "http-bad-status", $code, $message );
 444                 }
 445         }
 446
 447         /**
 448          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 449          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 450          * for a list of status codes.)
 451          *
 452          * @return Integer
 453          */
 454         public function getStatus() {
 455                 if ( !$this->respHeaders ) {
 456                         $this->parseHeader();
 457                 }
 458
 459                 return (int)$this->respStatus;
 460         }
 461
 462
 463         /**
 464          * Returns true if the last status code was a redirect.
 465          *
 466          * @return Boolean
 467          */
 468         public function isRedirect() {
 469                 if ( !$this->respHeaders ) {
 470                         $this->parseHeader();
 471                 }
 472
 473                 $status = (int)$this->respStatus;
 474
 475                 if ( $status >= 300 && $status <= 303 ) {
 476                         return true;
 477                 }
 478
 479                 return false;
 480         }
 481
 482         /**
 483          * Returns an associative array of response headers after the
 484          * request has been executed.  Because some headers
 485          * (e.g. Set-Cookie) can appear more than once the, each value of
 486          * the associative array is an array of the values given.
 487          *
 488          * @return Array
 489          */
 490         public function getResponseHeaders() {
 491                 if ( !$this->respHeaders ) {
 492                         $this->parseHeader();
 493                 }
 494
 495                 return $this->respHeaders;
 496         }
 497
 498         /**
 499          * Returns the value of the given response header.
 500          *
 501          * @param $header String
 502          * @return String
 503          */
 504         public function getResponseHeader( $header ) {
 505                 if ( !$this->respHeaders ) {
 506                         $this->parseHeader();
 507                 }
 508
 509                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 510                         $v = $this->respHeaders[strtolower ( $header ) ];
 511                         return $v[count( $v ) - 1];
 512                 }
 513
 514                 return null;
 515         }
 516
 517         /**
 518          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 519          *
 520          * @param $jar CookieJar
 521          */
 522         public function setCookieJar( $jar ) {
 523                 $this->cookieJar = $jar;
 524         }
 525
 526         /**
 527          * Returns the cookie jar in use.
 528          *
 529          * @returns CookieJar
 530          */
 531         public function getCookieJar() {
 532                 if ( !$this->respHeaders ) {
 533                         $this->parseHeader();
 534                 }
 535
 536                 return $this->cookieJar;
 537         }
 538
 539         /**
 540          * Sets a cookie.  Used before a request to set up any individual
 541          * cookies.      Used internally after a request to parse the
 542          * Set-Cookie headers.
 543          * @see Cookie::set
 544          */
 545         public function setCookie( $name, $value = null, $attr = null ) {
 546                 if ( !$this->cookieJar ) {
 547                         $this->cookieJar = new CookieJar;
 548                 }
 549
 550                 $this->cookieJar->setCookie( $name, $value, $attr );
 551         }
 552
 553         /**
 554          * Parse the cookies in the response headers and store them in the cookie jar.
 555          */
 556         protected function parseCookies() {
 557                 if ( !$this->cookieJar ) {
 558                         $this->cookieJar = new CookieJar;
 559                 }
 560
 561                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 562                         $url = parse_url( $this->getFinalUrl() );
 563                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 564                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 565                         }
 566                 }
 567         }
 568
 569         /**
 570          * Returns the final URL after all redirections.
 571          *
 572          * @return String
 573          */
 574         public function getFinalUrl() {
 575                 $location = $this->getResponseHeader( "Location" );
 576
 577                 if ( $location ) {
 578                         return $location;
 579                 }
 580
 581                 return $this->url;
 582         }
 583
 584         /**
 585          * Returns true if the backend can follow redirects. Overridden by the
 586          * child classes.
 587          */
 588         public function canFollowRedirects() {
 589                 return true;
 590         }
 591 }
 592
 593 /**
 594  * MWHttpRequest implemented using internal curl compiled into PHP
 595  */
 596 class CurlHttpRequest extends MWHttpRequest {
 597         const SUPPORTS_FILE_POSTS = true;
 598
 599         static $curlMessageMap = array(
 600                 6 => 'http-host-unreachable',
 601                 28 => 'http-timed-out'
 602         );
 603
 604         protected $curlOptions = array();
 605         protected $headerText = "";
 606
 607         protected function readHeader( $fh, $content ) {
 608                 $this->headerText .= $content;
 609                 return strlen( $content );
 610         }
 611
 612         public function execute() {
 613                 parent::execute();
 614
 615                 if ( !$this->status->isOK() ) {
 616                         return $this->status;
 617                 }
 618
 619                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 620                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 621                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 622                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 623                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 624                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 625                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 626
 627                 /* not sure these two are actually necessary */
 628                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 629                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 630                 }
 631                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 632
 633                 if ( isset( $this->sslVerifyHost ) ) {
 634                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 635                 }
 636
 637                 if ( isset( $this->sslVerifyCert ) ) {
 638                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 639                 }
 640
 641                 if ( $this->caInfo ) {
 642                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 643                 }
 644
 645                 if ( $this->headersOnly ) {
 646                         $this->curlOptions[CURLOPT_NOBODY] = true;
 647                         $this->curlOptions[CURLOPT_HEADER] = true;
 648                 } elseif ( $this->method == 'POST' ) {
 649                         $this->curlOptions[CURLOPT_POST] = true;
 650                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 651                         // Suppress 'Expect: 100-continue' header, as some servers
 652                         // will reject it with a 417 and Curl won't auto retry
 653                         // with HTTP 1.0 fallback
 654                         $this->reqHeaders['Expect'] = '';
 655                 } else {
 656                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 657                 }
 658
 659                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 660
 661                 $curlHandle = curl_init( $this->url );
 662
 663                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 664                         throw new MWException( "Error setting curl options." );
 665                 }
 666
 667                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 668                         wfSuppressWarnings();
 669                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 670                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 671                                         "Probably safe_mode or open_basedir is set.\n" );
 672                                 // Continue the processing. If it were in curl_setopt_array,
 673                                 // processing would have halted on its entry
 674                         }
 675                         wfRestoreWarnings();
 676                 }
 677
 678                 if ( false === curl_exec( $curlHandle ) ) {
 679                         $code = curl_error( $curlHandle );
 680
 681                         if ( isset( self::$curlMessageMap[$code] ) ) {
 682                                 $this->status->fatal( self::$curlMessageMap[$code] );
 683                         } else {
 684                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 685                         }
 686                 } else {
 687                         $this->headerList = explode( "\r\n", $this->headerText );
 688                 }
 689
 690                 curl_close( $curlHandle );
 691
 692                 $this->parseHeader();
 693                 $this->setStatus();
 694
 695                 return $this->status;
 696         }
 697
 698         public function canFollowRedirects() {
 699                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 700                         wfDebug( "Cannot follow redirects in safe mode\n" );
 701                         return false;
 702                 }
 703
 704                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 705                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 706                         return false;
 707                 }
 708
 709                 return true;
 710         }
 711 }
 712
 713 class PhpHttpRequest extends MWHttpRequest {
 714         protected function urlToTcp( $url ) {
 715                 $parsedUrl = parse_url( $url );
 716
 717                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 718         }
 719
 720         public function execute() {
 721                 parent::execute();
 722
 723                 if ( is_array( $this->postData ) ) {
 724                         $this->postData = wfArrayToCGI( $this->postData );
 725                 }
 726
 727                 if ( $this->parsedUrl['scheme'] != 'http' &&
 728                          $this->parsedUrl['scheme'] != 'https' ) {
 729                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 730                 }
 731
 732                 $this->reqHeaders['Accept'] = "*/*";
 733                 if ( $this->method == 'POST' ) {
 734                         // Required for HTTP 1.0 POSTs
 735                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 736                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 737                 }
 738
 739                 $options = array();
 740                 if ( $this->proxy && !$this->noProxy ) {
 741                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 742                         $options['request_fulluri'] = true;
 743                 }
 744
 745                 if ( !$this->followRedirects ) {
 746                         $options['max_redirects'] = 0;
 747                 } else {
 748                         $options['max_redirects'] = $this->maxRedirects;
 749                 }
 750
 751                 $options['method'] = $this->method;
 752                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 753                 // Note that at some future point we may want to support
 754                 // HTTP/1.1, but we'd have to write support for chunking
 755                 // in version of PHP < 5.3.1
 756                 $options['protocol_version'] = "1.0";
 757
 758                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 759                 // Only works on 5.2.10+
 760                 $options['ignore_errors'] = true;
 761
 762                 if ( $this->postData ) {
 763                         $options['content'] = $this->postData;
 764                 }
 765
 766                 $options['timeout'] = $this->timeout;
 767
 768                 $context = stream_context_create( array( 'http' => $options ) );
 769
 770                 $this->headerList = array();
 771                 $reqCount = 0;
 772                 $url = $this->url;
 773
 774                 $result = array();
 775
 776                 do {
 777                         $reqCount++;
 778                         wfSuppressWarnings();
 779                         $fh = fopen( $url, "r", false, $context );
 780                         wfRestoreWarnings();
 781
 782                         if ( !$fh ) {
 783                                 break;
 784                         }
 785
 786                         $result = stream_get_meta_data( $fh );
 787                         $this->headerList = $result['wrapper_data'];
 788                         $this->parseHeader();
 789
 790                         if ( !$this->followRedirects ) {
 791                                 break;
 792                         }
 793
 794                         # Handle manual redirection
 795                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 796                                 break;
 797                         }
 798                         # Check security of URL
 799                         $url = $this->getResponseHeader( "Location" );
 800
 801                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 802                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 803                                 break;
 804                         }
 805                 } while ( true );
 806
 807                 $this->setStatus();
 808
 809                 if ( $fh === false ) {
 810                         $this->status->fatal( 'http-request-error' );
 811                         return $this->status;
 812                 }
 813
 814                 if ( $result['timed_out'] ) {
 815                         $this->status->fatal( 'http-timed-out', $this->url );
 816                         return $this->status;
 817                 }
 818
 819                 // If everything went OK, or we recieved some error code
 820                 // get the response body content.
 821                 if ( $this->status->isOK()
 822                                 || (int)$this->respStatus >= 300) {
 823                         while ( !feof( $fh ) ) {
 824                                 $buf = fread( $fh, 8192 );
 825
 826                                 if ( $buf === false ) {
 827                                         $this->status->fatal( 'http-read-error' );
 828                                         break;
 829                                 }
 830
 831                                 if ( strlen( $buf ) ) {
 832                                         call_user_func( $this->callback, $fh, $buf );
 833                                 }
 834                         }
 835                 }
 836                 fclose( $fh );
 837
 838                 return $this->status;
 839         }
 840 }