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