includes/HttpFunctions.php

   1 <?php
   2 /**
   3  * @defgroup HTTP HTTP
   4  */
   5
   6 /**
   7  * Various HTTP related functions
   8  * @ingroup HTTP
   9  */
  10 class Http {
  11         static $httpEngine = false;
  12
  13         /**
  14          * Perform an HTTP request
  15          *
  16          * @param $method String: HTTP method. Usually GET/POST
  17          * @param $url String: full URL to act on
  18          * @param $options Array: options to pass to MWHttpRequest object.
  19          *      Possible keys for the array:
  20          *    - timeout             Timeout length in seconds
  21          *    - postData            An array of key-value pairs or a url-encoded form data
  22          *    - proxy               The proxy to use.
  23          *                          Will use $wgHTTPProxy (if set) otherwise.
  24          *    - noProxy             Override $wgHTTPProxy (if set) and don't use any proxy at all.
  25          *    - sslVerifyHost       (curl only) Verify hostname against certificate
  26          *    - sslVerifyCert       (curl only) Verify SSL certificate
  27          *    - caInfo              (curl only) Provide CA information
  28          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  29          *    - followRedirects     Whether to follow redirects (defaults to false).
  30          *                                  Note: this should only be used when the target URL is trusted,
  31          *                                  to avoid attacks on intranet services accessible by HTTP.
  32          * @return Mixed: (bool)false on failure or a string on success
  33          */
  34         public static function request( $method, $url, $options = array() ) {
  35                 $url = wfExpandUrl( $url );
  36                 wfDebug( "HTTP: $method: $url\n" );
  37                 $options['method'] = strtoupper( $method );
  38
  39                 if ( !isset( $options['timeout'] ) ) {
  40                         $options['timeout'] = 'default';
  41                 }
  42
  43                 $req = MWHttpRequest::factory( $url, $options );
  44                 $status = $req->execute();
  45
  46                 if ( $status->isOK() ) {
  47                         return $req->getContent();
  48                 } else {
  49                         return false;
  50                 }
  51         }
  52
  53         /**
  54          * Simple wrapper for Http::request( 'GET' )
  55          * @see Http::request()
  56          *
  57          * @return string
  58          */
  59         public static function get( $url, $timeout = 'default', $options = array() ) {
  60                 $options['timeout'] = $timeout;
  61                 return Http::request( 'GET', $url, $options );
  62         }
  63
  64         /**
  65          * Simple wrapper for Http::request( 'POST' )
  66          * @see Http::request()
  67          *
  68          * @return string
  69          */
  70         public static function post( $url, $options = array() ) {
  71                 return Http::request( 'POST', $url, $options );
  72         }
  73
  74         /**
  75          * Check if the URL can be served by localhost
  76          *
  77          * @param $url String: full url to check
  78          * @return Boolean
  79          */
  80         public static function isLocalURL( $url ) {
  81                 global $wgCommandLineMode, $wgConf;
  82
  83                 if ( $wgCommandLineMode ) {
  84                         return false;
  85                 }
  86
  87                 // Extract host part
  88                 $matches = array();
  89                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
  90                         $host = $matches[1];
  91                         // Split up dotwise
  92                         $domainParts = explode( '.', $host );
  93                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
  94                         $domainParts = array_reverse( $domainParts );
  95
  96                         $domain = '';
  97                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
  98                                 $domainPart = $domainParts[$i];
  99                                 if ( $i == 0 ) {
 100                                         $domain = $domainPart;
 101                                 } else {
 102                                         $domain = $domainPart . '.' . $domain;
 103                                 }
 104
 105                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 106                                         return true;
 107                                 }
 108                         }
 109                 }
 110
 111                 return false;
 112         }
 113
 114         /**
 115          * A standard user-agent we can use for external requests.
 116          * @return String
 117          */
 118         public static function userAgent() {
 119                 global $wgVersion;
 120                 return "MediaWiki/$wgVersion";
 121         }
 122
 123         /**
 124          * Checks that the given URI is a valid one. Hardcoding the
 125          * protocols, because we only want protocols that both cURL
 126          * and php support.
 127          *
 128          * @fixme this is wildly inaccurate and fails to actually check most stuff
 129          *
 130          * @param $uri Mixed: URI to check for validity
 131          * @returns Boolean
 132          */
 133         public static function isValidURI( $uri ) {
 134                 return preg_match(
 135                         '/^https?:\/\/[^\/\s]\S*$/D',
 136                         $uri
 137                 );
 138         }
 139 }
 140
 141 /**
 142  * This wrapper class will call out to curl (if available) or fallback
 143  * to regular PHP if necessary for handling internal HTTP requests.
 144  *
 145  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 146  * PHP's HTTP extension.
 147  */
 148 class MWHttpRequest {
 149         const SUPPORTS_FILE_POSTS = false;
 150
 151         protected $content;
 152         protected $timeout = 'default';
 153         protected $headersOnly = null;
 154         protected $postData = null;
 155         protected $proxy = null;
 156         protected $noProxy = false;
 157         protected $sslVerifyHost = true;
 158         protected $sslVerifyCert = true;
 159         protected $caInfo = null;
 160         protected $method = "GET";
 161         protected $reqHeaders = array();
 162         protected $url;
 163         protected $parsedUrl;
 164         protected $callback;
 165         protected $maxRedirects = 5;
 166         protected $followRedirects = false;
 167
 168         /**
 169          * @var  CookieJar
 170          */
 171         protected $cookieJar;
 172
 173         protected $headerList = array();
 174         protected $respVersion = "0.9";
 175         protected $respStatus = "200 Ok";
 176         protected $respHeaders = array();
 177
 178         public $status;
 179
 180         /**
 181          * @param $url String: url to use
 182          * @param $options Array: (optional) extra params to pass (see Http::request())
 183          */
 184         function __construct( $url, $options = array() ) {
 185                 global $wgHTTPTimeout;
 186
 187                 $this->url = $url;
 188                 $this->parsedUrl = parse_url( $url );
 189
 190                 if ( !Http::isValidURI( $this->url ) ) {
 191                         $this->status = Status::newFatal( 'http-invalid-url' );
 192                 } else {
 193                         $this->status = Status::newGood( 100 ); // continue
 194                 }
 195
 196                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 197                         $this->timeout = $options['timeout'];
 198                 } else {
 199                         $this->timeout = $wgHTTPTimeout;
 200                 }
 201
 202                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 203                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 204
 205                 foreach ( $members as $o ) {
 206                         if ( isset( $options[$o] ) ) {
 207                                 $this->$o = $options[$o];
 208                         }
 209                 }
 210         }
 211
 212         /**
 213          * Generate a new request object
 214          * @param $url String: url to use
 215          * @param $options Array: (optional) extra params to pass (see Http::request())
 216          * @see MWHttpRequest::__construct
 217          */
 218         public static function factory( $url, $options = null ) {
 219                 if ( !Http::$httpEngine ) {
 220                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 221                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 222                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 223                                                                    ' Http::$httpEngine is set to "curl"' );
 224                 }
 225
 226                 switch( Http::$httpEngine ) {
 227                         case 'curl':
 228                                 return new CurlHttpRequest( $url, $options );
 229                         case 'php':
 230                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 231                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 232                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 233                                 }
 234                                 return new PhpHttpRequest( $url, $options );
 235                         default:
 236                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 237                 }
 238         }
 239
 240         /**
 241          * Get the body, or content, of the response to the request
 242          *
 243          * @return String
 244          */
 245         public function getContent() {
 246                 return $this->content;
 247         }
 248
 249         /**
 250          * Set the parameters of the request
 251
 252          * @param $args Array
 253          * @todo overload the args param
 254          */
 255         public function setData( $args ) {
 256                 $this->postData = $args;
 257         }
 258
 259         /**
 260          * Take care of setting up the proxy
 261          * (override in subclass)
 262          *
 263          * @return String
 264          */
 265         public function proxySetup() {
 266                 global $wgHTTPProxy;
 267
 268                 if ( $this->proxy ) {
 269                         return;
 270                 }
 271
 272                 if ( Http::isLocalURL( $this->url ) ) {
 273                         $this->proxy = 'http://localhost:80/';
 274                 } elseif ( $wgHTTPProxy ) {
 275                         $this->proxy = $wgHTTPProxy ;
 276                 } elseif ( $this->useProxy( $this->url ) ) {
 277                         $this->proxy = $this->useProxy( $this->url );
 278                 }
 279         }
 280
 281         /**
 282          * Determine HTTP proxy from environment settings respecting
 283          * 'http_proxy' and 'no_proxy' environment variables
 284          */
 285         public static function useProxy( $url ) {
 286                 if ( $proxy = getenv( "http_proxy" ) ) {
 287                         $useproxy = true;
 288                         if ( $url && ( $noproxy = preg_split( "#\s*,\s*#is", getenv( "no_proxy" ) ) ) ) {
 289                                 foreach ( $noproxy as $n ) {
 290                                         if ( preg_match('#(\d+)\.(\d+)\.(\d+)\.(\d+)/(\d+)#s', $n, $m) &&
 291                                                  preg_match('#^[a-z0-9_]+://(?:[^/]*:[^/]*@)?([^/@]+)(?:/|$|\?)#is', $url, $ip) ) {
 292                                                 $mask = array(
 293                                                         max( 0x100 - ( 1 << max(  8-$m[5], 0 ) ), 0 ),
 294                                                         max( 0x100 - ( 1 << max( 16-$m[5], 0 ) ), 0 ),
 295                                                         max( 0x100 - ( 1 << max( 24-$m[5], 0 ) ), 0 ),
 296                                                         max( 0x100 - ( 1 << max( 32-$m[5], 0 ) ), 0 ),
 297                                                 );
 298                                                 $ip = @gethostbyname( $ip[1] );
 299                                                 if ( preg_match( '#(\d+)\.(\d+)\.(\d+)\.(\d+)#s', $ip, $ipm ) &&
 300                                                         ( intval( $ipm[1] ) & $mask[0] ) == intval( $m[1] ) &&
 301                                                         ( intval( $ipm[2] ) & $mask[1] ) == intval( $m[2] ) &&
 302                                                         ( intval( $ipm[3] ) & $mask[2] ) == intval( $m[3] ) &&
 303                                                         ( intval( $ipm[4] ) & $mask[3] ) == intval( $m[4] ) ) {
 304                                                         $useproxy = false;
 305                                                         break;
 306                                                 }
 307                                         } else {
 308                                                 $n = preg_replace( '/#.*$/is', '', $n );
 309                                                 $n = preg_quote( $n );
 310                                                 $n = str_replace( '\\*', '.*', $n );
 311                                                 if ( preg_match( '#'.$n.'#is', $url ) ) {
 312                                                         $useproxy = false;
 313                                                         break;
 314                                                 }
 315                                         }
 316                                 }
 317                         }
 318                         if ( $useproxy ) {
 319                                 $proxy = preg_replace( '#^http://#is', '', $proxy );
 320                                 $proxy = preg_replace( '#/*$#is', '', $proxy );
 321                         }
 322                         else {
 323                                 $proxy = null;
 324                         }
 325                         return $proxy;
 326                 }
 327                 return null;
 328         }
 329
 330         /**
 331          * Set the refererer header
 332          */
 333         public function setReferer( $url ) {
 334                 $this->setHeader( 'Referer', $url );
 335         }
 336
 337         /**
 338          * Set the user agent
 339          */
 340         public function setUserAgent( $UA ) {
 341                 $this->setHeader( 'User-Agent', $UA );
 342         }
 343
 344         /**
 345          * Set an arbitrary header
 346          */
 347         public function setHeader( $name, $value ) {
 348                 // I feel like I should normalize the case here...
 349                 $this->reqHeaders[$name] = $value;
 350         }
 351
 352         /**
 353          * Get an array of the headers
 354          */
 355         public function getHeaderList() {
 356                 $list = array();
 357
 358                 if ( $this->cookieJar ) {
 359                         $this->reqHeaders['Cookie'] =
 360                                 $this->cookieJar->serializeToHttpRequest(
 361                                         $this->parsedUrl['path'],
 362                                         $this->parsedUrl['host']
 363                                 );
 364                 }
 365
 366                 foreach ( $this->reqHeaders as $name => $value ) {
 367                         $list[] = "$name: $value";
 368                 }
 369
 370                 return $list;
 371         }
 372
 373         /**
 374          * Set a read callback to accept data read from the HTTP request.
 375          * By default, data is appended to an internal buffer which can be
 376          * retrieved through $req->getContent().
 377          *
 378          * To handle data as it comes in -- especially for large files that
 379          * would not fit in memory -- you can instead set your own callback,
 380          * in the form function($resource, $buffer) where the first parameter
 381          * is the low-level resource being read (implementation specific),
 382          * and the second parameter is the data buffer.
 383          *
 384          * You MUST return the number of bytes handled in the buffer; if fewer
 385          * bytes are reported handled than were passed to you, the HTTP fetch
 386          * will be aborted.
 387          *
 388          * @param $callback Callback
 389          */
 390         public function setCallback( $callback ) {
 391                 if ( !is_callable( $callback ) ) {
 392                         throw new MWException( 'Invalid MwHttpRequest callback' );
 393                 }
 394                 $this->callback = $callback;
 395         }
 396
 397         /**
 398          * A generic callback to read the body of the response from a remote
 399          * server.
 400          *
 401          * @param $fh handle
 402          * @param $content String
 403          */
 404         public function read( $fh, $content ) {
 405                 $this->content .= $content;
 406                 return strlen( $content );
 407         }
 408
 409         /**
 410          * Take care of whatever is necessary to perform the URI request.
 411          *
 412          * @return Status
 413          */
 414         public function execute() {
 415                 global $wgTitle;
 416
 417                 $this->content = "";
 418
 419                 if ( strtoupper( $this->method ) == "HEAD" ) {
 420                         $this->headersOnly = true;
 421                 }
 422
 423                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 424                         $this->setReferer( $wgTitle->getFullURL() );
 425                 }
 426
 427                 if ( !$this->noProxy ) {
 428                         $this->proxySetup();
 429                 }
 430
 431                 if ( !$this->callback ) {
 432                         $this->setCallback( array( $this, 'read' ) );
 433                 }
 434
 435                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 436                         $this->setUserAgent( Http::userAgent() );
 437                 }
 438         }
 439
 440         /**
 441          * Parses the headers, including the HTTP status code and any
 442          * Set-Cookie headers.  This function expectes the headers to be
 443          * found in an array in the member variable headerList.
 444          *
 445          * @return nothing
 446          */
 447         protected function parseHeader() {
 448                 $lastname = "";
 449
 450                 foreach ( $this->headerList as $header ) {
 451                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 452                                 $this->respVersion = $match[1];
 453                                 $this->respStatus = $match[2];
 454                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 455                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 456                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 457                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 458                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 459                                 $lastname = strtolower( $match[1] );
 460                         }
 461                 }
 462
 463                 $this->parseCookies();
 464         }
 465
 466         /**
 467          * Sets HTTPRequest status member to a fatal value with the error
 468          * message if the returned integer value of the status code was
 469          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 470          * RFC2616, section 10,
 471          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 472          * list of status codes.)
 473          *
 474          * @return nothing
 475          */
 476         protected function setStatus() {
 477                 if ( !$this->respHeaders ) {
 478                         $this->parseHeader();
 479                 }
 480
 481                 if ( (int)$this->respStatus > 399 ) {
 482                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 483                         $this->status->fatal( "http-bad-status", $code, $message );
 484                 }
 485         }
 486
 487         /**
 488          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 489          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 490          * for a list of status codes.)
 491          *
 492          * @return Integer
 493          */
 494         public function getStatus() {
 495                 if ( !$this->respHeaders ) {
 496                         $this->parseHeader();
 497                 }
 498
 499                 return (int)$this->respStatus;
 500         }
 501
 502
 503         /**
 504          * Returns true if the last status code was a redirect.
 505          *
 506          * @return Boolean
 507          */
 508         public function isRedirect() {
 509                 if ( !$this->respHeaders ) {
 510                         $this->parseHeader();
 511                 }
 512
 513                 $status = (int)$this->respStatus;
 514
 515                 if ( $status >= 300 && $status <= 303 ) {
 516                         return true;
 517                 }
 518
 519                 return false;
 520         }
 521
 522         /**
 523          * Returns an associative array of response headers after the
 524          * request has been executed.  Because some headers
 525          * (e.g. Set-Cookie) can appear more than once the, each value of
 526          * the associative array is an array of the values given.
 527          *
 528          * @return Array
 529          */
 530         public function getResponseHeaders() {
 531                 if ( !$this->respHeaders ) {
 532                         $this->parseHeader();
 533                 }
 534
 535                 return $this->respHeaders;
 536         }
 537
 538         /**
 539          * Returns the value of the given response header.
 540          *
 541          * @param $header String
 542          * @return String
 543          */
 544         public function getResponseHeader( $header ) {
 545                 if ( !$this->respHeaders ) {
 546                         $this->parseHeader();
 547                 }
 548
 549                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 550                         $v = $this->respHeaders[strtolower ( $header ) ];
 551                         return $v[count( $v ) - 1];
 552                 }
 553
 554                 return null;
 555         }
 556
 557         /**
 558          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 559          *
 560          * @param $jar CookieJar
 561          */
 562         public function setCookieJar( $jar ) {
 563                 $this->cookieJar = $jar;
 564         }
 565
 566         /**
 567          * Returns the cookie jar in use.
 568          *
 569          * @returns CookieJar
 570          */
 571         public function getCookieJar() {
 572                 if ( !$this->respHeaders ) {
 573                         $this->parseHeader();
 574                 }
 575
 576                 return $this->cookieJar;
 577         }
 578
 579         /**
 580          * Sets a cookie.  Used before a request to set up any individual
 581          * cookies.      Used internally after a request to parse the
 582          * Set-Cookie headers.
 583          * @see Cookie::set
 584          */
 585         public function setCookie( $name, $value = null, $attr = null ) {
 586                 if ( !$this->cookieJar ) {
 587                         $this->cookieJar = new CookieJar;
 588                 }
 589
 590                 $this->cookieJar->setCookie( $name, $value, $attr );
 591         }
 592
 593         /**
 594          * Parse the cookies in the response headers and store them in the cookie jar.
 595          */
 596         protected function parseCookies() {
 597                 if ( !$this->cookieJar ) {
 598                         $this->cookieJar = new CookieJar;
 599                 }
 600
 601                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 602                         $url = parse_url( $this->getFinalUrl() );
 603                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 604                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 605                         }
 606                 }
 607         }
 608
 609         /**
 610          * Returns the final URL after all redirections.
 611          *
 612          * @return String
 613          */
 614         public function getFinalUrl() {
 615                 $location = $this->getResponseHeader( "Location" );
 616
 617                 if ( $location ) {
 618                         return $location;
 619                 }
 620
 621                 return $this->url;
 622         }
 623
 624         /**
 625          * Returns true if the backend can follow redirects. Overridden by the
 626          * child classes.
 627          */
 628         public function canFollowRedirects() {
 629                 return true;
 630         }
 631 }
 632
 633 /**
 634  * MWHttpRequest implemented using internal curl compiled into PHP
 635  */
 636 class CurlHttpRequest extends MWHttpRequest {
 637         const SUPPORTS_FILE_POSTS = true;
 638
 639         static $curlMessageMap = array(
 640                 6 => 'http-host-unreachable',
 641                 28 => 'http-timed-out'
 642         );
 643
 644         protected $curlOptions = array();
 645         protected $headerText = "";
 646
 647         protected function readHeader( $fh, $content ) {
 648                 $this->headerText .= $content;
 649                 return strlen( $content );
 650         }
 651
 652         public function execute() {
 653                 parent::execute();
 654
 655                 if ( !$this->status->isOK() ) {
 656                         return $this->status;
 657                 }
 658
 659                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 660                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 661                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 662                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 663                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 664                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 665                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 666
 667                 /* not sure these two are actually necessary */
 668                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 669                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 670                 }
 671                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 672
 673                 if ( isset( $this->sslVerifyHost ) ) {
 674                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 675                 }
 676
 677                 if ( isset( $this->sslVerifyCert ) ) {
 678                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 679                 }
 680
 681                 if ( $this->caInfo ) {
 682                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 683                 }
 684
 685                 if ( $this->headersOnly ) {
 686                         $this->curlOptions[CURLOPT_NOBODY] = true;
 687                         $this->curlOptions[CURLOPT_HEADER] = true;
 688                 } elseif ( $this->method == 'POST' ) {
 689                         $this->curlOptions[CURLOPT_POST] = true;
 690                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 691                         // Suppress 'Expect: 100-continue' header, as some servers
 692                         // will reject it with a 417 and Curl won't auto retry
 693                         // with HTTP 1.0 fallback
 694                         $this->reqHeaders['Expect'] = '';
 695                 } else {
 696                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 697                 }
 698
 699                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 700
 701                 $curlHandle = curl_init( $this->url );
 702
 703                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 704                         throw new MWException( "Error setting curl options." );
 705                 }
 706
 707                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 708                         wfSuppressWarnings();
 709                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 710                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 711                                         "Probably safe_mode or open_basedir is set.\n" );
 712                                 // Continue the processing. If it were in curl_setopt_array,
 713                                 // processing would have halted on its entry
 714                         }
 715                         wfRestoreWarnings();
 716                 }
 717
 718                 if ( false === curl_exec( $curlHandle ) ) {
 719                         $code = curl_error( $curlHandle );
 720
 721                         if ( isset( self::$curlMessageMap[$code] ) ) {
 722                                 $this->status->fatal( self::$curlMessageMap[$code] );
 723                         } else {
 724                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 725                         }
 726                 } else {
 727                         $this->headerList = explode( "\r\n", $this->headerText );
 728                 }
 729
 730                 curl_close( $curlHandle );
 731
 732                 $this->parseHeader();
 733                 $this->setStatus();
 734
 735                 return $this->status;
 736         }
 737
 738         public function canFollowRedirects() {
 739                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 740                         wfDebug( "Cannot follow redirects in safe mode\n" );
 741                         return false;
 742                 }
 743
 744                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 745                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 746                         return false;
 747                 }
 748
 749                 return true;
 750         }
 751 }
 752
 753 class PhpHttpRequest extends MWHttpRequest {
 754         protected function urlToTcp( $url ) {
 755                 $parsedUrl = parse_url( $url );
 756
 757                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 758         }
 759
 760         public function execute() {
 761                 parent::execute();
 762
 763                 if ( is_array( $this->postData ) ) {
 764                         $this->postData = wfArrayToCGI( $this->postData );
 765                 }
 766
 767                 if ( $this->parsedUrl['scheme'] != 'http' &&
 768                          $this->parsedUrl['scheme'] != 'https' ) {
 769                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 770                 }
 771
 772                 $this->reqHeaders['Accept'] = "*/*";
 773                 if ( $this->method == 'POST' ) {
 774                         // Required for HTTP 1.0 POSTs
 775                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 776                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 777                 }
 778
 779                 $options = array();
 780                 if ( $this->proxy && !$this->noProxy ) {
 781                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 782                         $options['request_fulluri'] = true;
 783                 }
 784
 785                 if ( !$this->followRedirects ) {
 786                         $options['max_redirects'] = 0;
 787                 } else {
 788                         $options['max_redirects'] = $this->maxRedirects;
 789                 }
 790
 791                 $options['method'] = $this->method;
 792                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 793                 // Note that at some future point we may want to support
 794                 // HTTP/1.1, but we'd have to write support for chunking
 795                 // in version of PHP < 5.3.1
 796                 $options['protocol_version'] = "1.0";
 797
 798                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 799                 // Only works on 5.2.10+
 800                 $options['ignore_errors'] = true;
 801
 802                 if ( $this->postData ) {
 803                         $options['content'] = $this->postData;
 804                 }
 805
 806                 $options['timeout'] = $this->timeout;
 807
 808                 $context = stream_context_create( array( 'http' => $options ) );
 809
 810                 $this->headerList = array();
 811                 $reqCount = 0;
 812                 $url = $this->url;
 813
 814                 $result = array();
 815
 816                 do {
 817                         $reqCount++;
 818                         wfSuppressWarnings();
 819                         $fh = fopen( $url, "r", false, $context );
 820                         wfRestoreWarnings();
 821
 822                         if ( !$fh ) {
 823                                 break;
 824                         }
 825
 826                         $result = stream_get_meta_data( $fh );
 827                         $this->headerList = $result['wrapper_data'];
 828                         $this->parseHeader();
 829
 830                         if ( !$this->followRedirects ) {
 831                                 break;
 832                         }
 833
 834                         # Handle manual redirection
 835                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 836                                 break;
 837                         }
 838                         # Check security of URL
 839                         $url = $this->getResponseHeader( "Location" );
 840
 841                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 842                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 843                                 break;
 844                         }
 845                 } while ( true );
 846
 847                 $this->setStatus();
 848
 849                 if ( $fh === false ) {
 850                         $this->status->fatal( 'http-request-error' );
 851                         return $this->status;
 852                 }
 853
 854                 if ( $result['timed_out'] ) {
 855                         $this->status->fatal( 'http-timed-out', $this->url );
 856                         return $this->status;
 857                 }
 858
 859                 // If everything went OK, or we recieved some error code
 860                 // get the response body content.
 861                 if ( $this->status->isOK()
 862                                 || (int)$this->respStatus >= 300) {
 863                         while ( !feof( $fh ) ) {
 864                                 $buf = fread( $fh, 8192 );
 865
 866                                 if ( $buf === false ) {
 867                                         $this->status->fatal( 'http-read-error' );
 868                                         break;
 869                                 }
 870
 871                                 if ( strlen( $buf ) ) {
 872                                         call_user_func( $this->callback, $fh, $buf );
 873                                 }
 874                         }
 875                 }
 876                 fclose( $fh );
 877
 878                 return $this->status;
 879         }
 880 }