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 $wgHTTPProxy (if set) and don't use any proxy at all.
  25          *    - sslVerifyHost       (curl only) Verify hostname against certificate
  26          *    - sslVerifyCert       (curl only) Verify SSL certificate
  27          *    - caInfo              (curl only) Provide CA information
  28          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  29          *    - followRedirects     Whether to follow redirects (defaults to false).
  30          *                                  Note: this should only be used when the target URL is trusted,
  31          *                                  to avoid attacks on intranet services accessible by HTTP.
  32          *    - userAgent           A user agent, if you want to override the default
  33          *                          MediaWiki/$wgVersion
  34          * @return Mixed: (bool)false on failure or a string on success
  35          */
  36         public static function request( $method, $url, $options = array() ) {
  37                 wfDebug( "HTTP: $method: $url\n" );
  38                 $options['method'] = strtoupper( $method );
  39
  40                 if ( !isset( $options['timeout'] ) ) {
  41                         $options['timeout'] = 'default';
  42                 }
  43
  44                 $req = MWHttpRequest::factory( $url, $options );
  45                 if( isset( $options['userAgent'] ) ) {
  46                         $req->setUserAgent( $options['userAgent'] );
  47                 }
  48                 $status = $req->execute();
  49
  50                 if ( $status->isOK() ) {
  51                         return $req->getContent();
  52                 } else {
  53                         return false;
  54                 }
  55         }
  56
  57         /**
  58          * Simple wrapper for Http::request( 'GET' )
  59          * @see Http::request()
  60          *
  61          * @param $url
  62          * @param $timeout string
  63          * @param $options array
  64          * @return string
  65          */
  66         public static function get( $url, $timeout = 'default', $options = array() ) {
  67                 $options['timeout'] = $timeout;
  68                 return Http::request( 'GET', $url, $options );
  69         }
  70
  71         /**
  72          * Simple wrapper for Http::request( 'POST' )
  73          * @see Http::request()
  74          *
  75          * @param $url
  76          * @param $options array
  77          * @return string
  78          */
  79         public static function post( $url, $options = array() ) {
  80                 return Http::request( 'POST', $url, $options );
  81         }
  82
  83         /**
  84          * Check if the URL can be served by localhost
  85          *
  86          * @param $url String: full url to check
  87          * @return Boolean
  88          */
  89         public static function isLocalURL( $url ) {
  90                 global $wgCommandLineMode, $wgConf;
  91
  92                 if ( $wgCommandLineMode ) {
  93                         return false;
  94                 }
  95
  96                 // Extract host part
  97                 $matches = array();
  98                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
  99                         $host = $matches[1];
 100                         // Split up dotwise
 101                         $domainParts = explode( '.', $host );
 102                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
 103                         $domainParts = array_reverse( $domainParts );
 104
 105                         $domain = '';
 106                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
 107                                 $domainPart = $domainParts[$i];
 108                                 if ( $i == 0 ) {
 109                                         $domain = $domainPart;
 110                                 } else {
 111                                         $domain = $domainPart . '.' . $domain;
 112                                 }
 113
 114                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 115                                         return true;
 116                                 }
 117                         }
 118                 }
 119
 120                 return false;
 121         }
 122
 123         /**
 124          * A standard user-agent we can use for external requests.
 125          * @return String
 126          */
 127         public static function userAgent() {
 128                 global $wgVersion;
 129                 return "MediaWiki/$wgVersion";
 130         }
 131
 132         /**
 133          * Checks that the given URI is a valid one. Hardcoding the
 134          * protocols, because we only want protocols that both cURL
 135          * and php support.
 136          *
 137          * file:// should not be allowed here for security purpose (r67684)
 138          *
 139          * @fixme this is wildly inaccurate and fails to actually check most stuff
 140          *
 141          * @param $uri Mixed: URI to check for validity
 142          * @return Boolean
 143          */
 144         public static function isValidURI( $uri ) {
 145                 return preg_match(
 146                         '/^https?:\/\/[^\/\s]\S*$/D',
 147                         $uri
 148                 );
 149         }
 150 }
 151
 152 /**
 153  * This wrapper class will call out to curl (if available) or fallback
 154  * to regular PHP if necessary for handling internal HTTP requests.
 155  *
 156  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 157  * PHP's HTTP extension.
 158  */
 159 class MWHttpRequest {
 160         const SUPPORTS_FILE_POSTS = false;
 161
 162         protected $content;
 163         protected $timeout = 'default';
 164         protected $headersOnly = null;
 165         protected $postData = null;
 166         protected $proxy = null;
 167         protected $noProxy = false;
 168         protected $sslVerifyHost = true;
 169         protected $sslVerifyCert = true;
 170         protected $caInfo = null;
 171         protected $method = "GET";
 172         protected $reqHeaders = array();
 173         protected $url;
 174         protected $parsedUrl;
 175         protected $callback;
 176         protected $maxRedirects = 5;
 177         protected $followRedirects = false;
 178
 179         /**
 180          * @var  CookieJar
 181          */
 182         protected $cookieJar;
 183
 184         protected $headerList = array();
 185         protected $respVersion = "0.9";
 186         protected $respStatus = "200 Ok";
 187         protected $respHeaders = array();
 188
 189         public $status;
 190
 191         /**
 192          * @param $url String: url to use. If protocol-relative, will be expanded to an http:// URL
 193          * @param $options Array: (optional) extra params to pass (see Http::request())
 194          */
 195         function __construct( $url, $options = array() ) {
 196                 global $wgHTTPTimeout;
 197
 198                 $this->url = wfExpandUrl( $url, PROTO_HTTP );
 199                 $this->parsedUrl = wfParseUrl( $this->url );
 200
 201                 if ( !$this->parsedUrl || !Http::isValidURI( $this->url ) ) {
 202                         $this->status = Status::newFatal( 'http-invalid-url' );
 203                 } else {
 204                         $this->status = Status::newGood( 100 ); // continue
 205                 }
 206
 207                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 208                         $this->timeout = $options['timeout'];
 209                 } else {
 210                         $this->timeout = $wgHTTPTimeout;
 211                 }
 212
 213                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 214                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 215
 216                 foreach ( $members as $o ) {
 217                         if ( isset( $options[$o] ) ) {
 218                                 $this->$o = $options[$o];
 219                         }
 220                 }
 221         }
 222
 223         /**
 224          * Simple function to test if we can make any sort of requests at all, using
 225          * cURL or fopen()
 226          * @return bool
 227          */
 228         public static function canMakeRequests() {
 229                 return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
 230         }
 231
 232         /**
 233          * Generate a new request object
 234          * @param $url String: url to use
 235          * @param $options Array: (optional) extra params to pass (see Http::request())
 236          * @return \CurlHttpRequest|\PhpHttpRequest
 237          * @see MWHttpRequest::__construct
 238          */
 239         public static function factory( $url, $options = null ) {
 240                 if ( !Http::$httpEngine ) {
 241                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 242                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 243                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 244                                                                    ' Http::$httpEngine is set to "curl"' );
 245                 }
 246
 247                 switch( Http::$httpEngine ) {
 248                         case 'curl':
 249                                 return new CurlHttpRequest( $url, $options );
 250                         case 'php':
 251                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 252                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 253                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 254                                 }
 255                                 return new PhpHttpRequest( $url, $options );
 256                         default:
 257                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 258                 }
 259         }
 260
 261         /**
 262          * Get the body, or content, of the response to the request
 263          *
 264          * @return String
 265          */
 266         public function getContent() {
 267                 return $this->content;
 268         }
 269
 270         /**
 271          * Set the parameters of the request
 272
 273          * @param $args Array
 274          * @todo overload the args param
 275          */
 276         public function setData( $args ) {
 277                 $this->postData = $args;
 278         }
 279
 280         /**
 281          * Take care of setting up the proxy
 282          * (override in subclass)
 283          *
 284          * @return String
 285          */
 286         public function proxySetup() {
 287                 global $wgHTTPProxy;
 288
 289                 if ( $this->proxy ) {
 290                         return;
 291                 }
 292
 293                 if ( Http::isLocalURL( $this->url ) ) {
 294                         $this->proxy = '';
 295                 } elseif ( $wgHTTPProxy ) {
 296                         $this->proxy = $wgHTTPProxy ;
 297                 } elseif ( getenv( "http_proxy" ) ) {
 298                         $this->proxy = getenv( "http_proxy" );
 299                 }
 300         }
 301
 302         /**
 303          * Set the refererer header
 304          */
 305         public function setReferer( $url ) {
 306                 $this->setHeader( 'Referer', $url );
 307         }
 308
 309         /**
 310          * Set the user agent
 311          * @param $UA string
 312          */
 313         public function setUserAgent( $UA ) {
 314                 $this->setHeader( 'User-Agent', $UA );
 315         }
 316
 317         /**
 318          * Set an arbitrary header
 319          * @param $name
 320          * @param $value
 321          */
 322         public function setHeader( $name, $value ) {
 323                 // I feel like I should normalize the case here...
 324                 $this->reqHeaders[$name] = $value;
 325         }
 326
 327         /**
 328          * Get an array of the headers
 329          * @return array
 330          */
 331         public function getHeaderList() {
 332                 $list = array();
 333
 334                 if ( $this->cookieJar ) {
 335                         $this->reqHeaders['Cookie'] =
 336                                 $this->cookieJar->serializeToHttpRequest(
 337                                         $this->parsedUrl['path'],
 338                                         $this->parsedUrl['host']
 339                                 );
 340                 }
 341
 342                 foreach ( $this->reqHeaders as $name => $value ) {
 343                         $list[] = "$name: $value";
 344                 }
 345
 346                 return $list;
 347         }
 348
 349         /**
 350          * Set a read callback to accept data read from the HTTP request.
 351          * By default, data is appended to an internal buffer which can be
 352          * retrieved through $req->getContent().
 353          *
 354          * To handle data as it comes in -- especially for large files that
 355          * would not fit in memory -- you can instead set your own callback,
 356          * in the form function($resource, $buffer) where the first parameter
 357          * is the low-level resource being read (implementation specific),
 358          * and the second parameter is the data buffer.
 359          *
 360          * You MUST return the number of bytes handled in the buffer; if fewer
 361          * bytes are reported handled than were passed to you, the HTTP fetch
 362          * will be aborted.
 363          *
 364          * @param $callback Callback
 365          */
 366         public function setCallback( $callback ) {
 367                 if ( !is_callable( $callback ) ) {
 368                         throw new MWException( 'Invalid MwHttpRequest callback' );
 369                 }
 370                 $this->callback = $callback;
 371         }
 372
 373         /**
 374          * A generic callback to read the body of the response from a remote
 375          * server.
 376          *
 377          * @param $fh handle
 378          * @param $content String
 379          */
 380         public function read( $fh, $content ) {
 381                 $this->content .= $content;
 382                 return strlen( $content );
 383         }
 384
 385         /**
 386          * Take care of whatever is necessary to perform the URI request.
 387          *
 388          * @return Status
 389          */
 390         public function execute() {
 391                 global $wgTitle;
 392
 393                 $this->content = "";
 394
 395                 if ( strtoupper( $this->method ) == "HEAD" ) {
 396                         $this->headersOnly = true;
 397                 }
 398
 399                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 400                         $this->setReferer( wfExpandUrl( $wgTitle->getFullURL(), PROTO_CURRENT ) );
 401                 }
 402
 403                 if ( !$this->noProxy ) {
 404                         $this->proxySetup();
 405                 }
 406
 407                 if ( !$this->callback ) {
 408                         $this->setCallback( array( $this, 'read' ) );
 409                 }
 410
 411                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 412                         $this->setUserAgent( Http::userAgent() );
 413                 }
 414         }
 415
 416         /**
 417          * Parses the headers, including the HTTP status code and any
 418          * Set-Cookie headers.  This function expectes the headers to be
 419          * found in an array in the member variable headerList.
 420          *
 421          * @return nothing
 422          */
 423         protected function parseHeader() {
 424                 $lastname = "";
 425
 426                 foreach ( $this->headerList as $header ) {
 427                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 428                                 $this->respVersion = $match[1];
 429                                 $this->respStatus = $match[2];
 430                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 431                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 432                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 433                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 434                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 435                                 $lastname = strtolower( $match[1] );
 436                         }
 437                 }
 438
 439                 $this->parseCookies();
 440         }
 441
 442         /**
 443          * Sets HTTPRequest status member to a fatal value with the error
 444          * message if the returned integer value of the status code was
 445          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 446          * RFC2616, section 10,
 447          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 448          * list of status codes.)
 449          *
 450          * @return nothing
 451          */
 452         protected function setStatus() {
 453                 if ( !$this->respHeaders ) {
 454                         $this->parseHeader();
 455                 }
 456
 457                 if ( (int)$this->respStatus > 399 ) {
 458                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 459                         $this->status->fatal( "http-bad-status", $code, $message );
 460                 }
 461         }
 462
 463         /**
 464          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 465          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 466          * for a list of status codes.)
 467          *
 468          * @return Integer
 469          */
 470         public function getStatus() {
 471                 if ( !$this->respHeaders ) {
 472                         $this->parseHeader();
 473                 }
 474
 475                 return (int)$this->respStatus;
 476         }
 477
 478
 479         /**
 480          * Returns true if the last status code was a redirect.
 481          *
 482          * @return Boolean
 483          */
 484         public function isRedirect() {
 485                 if ( !$this->respHeaders ) {
 486                         $this->parseHeader();
 487                 }
 488
 489                 $status = (int)$this->respStatus;
 490
 491                 if ( $status >= 300 && $status <= 303 ) {
 492                         return true;
 493                 }
 494
 495                 return false;
 496         }
 497
 498         /**
 499          * Returns an associative array of response headers after the
 500          * request has been executed.  Because some headers
 501          * (e.g. Set-Cookie) can appear more than once the, each value of
 502          * the associative array is an array of the values given.
 503          *
 504          * @return Array
 505          */
 506         public function getResponseHeaders() {
 507                 if ( !$this->respHeaders ) {
 508                         $this->parseHeader();
 509                 }
 510
 511                 return $this->respHeaders;
 512         }
 513
 514         /**
 515          * Returns the value of the given response header.
 516          *
 517          * @param $header String
 518          * @return String
 519          */
 520         public function getResponseHeader( $header ) {
 521                 if ( !$this->respHeaders ) {
 522                         $this->parseHeader();
 523                 }
 524
 525                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 526                         $v = $this->respHeaders[strtolower ( $header ) ];
 527                         return $v[count( $v ) - 1];
 528                 }
 529
 530                 return null;
 531         }
 532
 533         /**
 534          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 535          *
 536          * @param $jar CookieJar
 537          */
 538         public function setCookieJar( $jar ) {
 539                 $this->cookieJar = $jar;
 540         }
 541
 542         /**
 543          * Returns the cookie jar in use.
 544          *
 545          * @return CookieJar
 546          */
 547         public function getCookieJar() {
 548                 if ( !$this->respHeaders ) {
 549                         $this->parseHeader();
 550                 }
 551
 552                 return $this->cookieJar;
 553         }
 554
 555         /**
 556          * Sets a cookie.  Used before a request to set up any individual
 557          * cookies.      Used internally after a request to parse the
 558          * Set-Cookie headers.
 559          * @see Cookie::set
 560          * @param $name
 561          * @param $value null
 562          * @param $attr null
 563          */
 564         public function setCookie( $name, $value = null, $attr = null ) {
 565                 if ( !$this->cookieJar ) {
 566                         $this->cookieJar = new CookieJar;
 567                 }
 568
 569                 $this->cookieJar->setCookie( $name, $value, $attr );
 570         }
 571
 572         /**
 573          * Parse the cookies in the response headers and store them in the cookie jar.
 574          */
 575         protected function parseCookies() {
 576                 if ( !$this->cookieJar ) {
 577                         $this->cookieJar = new CookieJar;
 578                 }
 579
 580                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 581                         $url = parse_url( $this->getFinalUrl() );
 582                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 583                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 584                         }
 585                 }
 586         }
 587
 588         /**
 589          * Returns the final URL after all redirections.
 590          *
 591          * Relative values of the "Location" header are incorrect as stated in RFC, however they do happen and modern browsers support them.
 592          * This function loops backwards through all locations in order to build the proper absolute URI - Marooned at wikia-inc.com
 593          *
 594          * @return string
 595          */
 596         public function getFinalUrl() {
 597                 $headers = $this->getResponseHeaders();
 598
 599                 //return full url (fix for incorrect but handled relative location)
 600                 if ( isset( $headers[ 'location' ] ) ) {
 601                         $locations = $headers[ 'location' ];
 602                         $domain = '';
 603                         $foundRelativeURI = false;
 604                         $countLocations = count($locations);
 605
 606                         for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
 607                                 $url = parse_url( $locations[ $i ] );
 608
 609                                 if ( isset($url[ 'host' ]) ) {
 610                                         $domain = $url[ 'scheme' ] . '://' . $url[ 'host' ];
 611                                         break;  //found correct URI (with host)
 612                                 } else {
 613                                         $foundRelativeURI = true;
 614                                 }
 615                         }
 616
 617                         if ( $foundRelativeURI ) {
 618                                 if ( $domain ) {
 619                                         return $domain . $locations[ $countLocations - 1 ];
 620                                 } else {
 621                                         $url = parse_url( $this->url );
 622                                         if ( isset($url[ 'host' ]) ) {
 623                                                 return $url[ 'scheme' ] . '://' . $url[ 'host' ] . $locations[ $countLocations - 1 ];
 624                                         }
 625                                 }
 626                         } else {
 627                                 return $locations[ $countLocations - 1 ];
 628                         }
 629                 }
 630
 631                 return $this->url;
 632         }
 633
 634         /**
 635          * Returns true if the backend can follow redirects. Overridden by the
 636          * child classes.
 637          * @return bool
 638          */
 639         public function canFollowRedirects() {
 640                 return true;
 641         }
 642 }
 643
 644 /**
 645  * MWHttpRequest implemented using internal curl compiled into PHP
 646  */
 647 class CurlHttpRequest extends MWHttpRequest {
 648         const SUPPORTS_FILE_POSTS = true;
 649
 650         static $curlMessageMap = array(
 651                 6 => 'http-host-unreachable',
 652                 28 => 'http-timed-out'
 653         );
 654
 655         protected $curlOptions = array();
 656         protected $headerText = "";
 657
 658         /**
 659          * @param $fh
 660          * @param $content
 661          * @return int
 662          */
 663         protected function readHeader( $fh, $content ) {
 664                 $this->headerText .= $content;
 665                 return strlen( $content );
 666         }
 667
 668         public function execute() {
 669                 parent::execute();
 670
 671                 if ( !$this->status->isOK() ) {
 672                         return $this->status;
 673                 }
 674
 675                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 676                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 677                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 678                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 679                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 680                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 681                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 682
 683                 /* not sure these two are actually necessary */
 684                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 685                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 686                 }
 687                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 688
 689                 if ( isset( $this->sslVerifyHost ) ) {
 690                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 691                 }
 692
 693                 if ( isset( $this->sslVerifyCert ) ) {
 694                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 695                 }
 696
 697                 if ( $this->caInfo ) {
 698                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 699                 }
 700
 701                 if ( $this->headersOnly ) {
 702                         $this->curlOptions[CURLOPT_NOBODY] = true;
 703                         $this->curlOptions[CURLOPT_HEADER] = true;
 704                 } elseif ( $this->method == 'POST' ) {
 705                         $this->curlOptions[CURLOPT_POST] = true;
 706                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 707                         // Suppress 'Expect: 100-continue' header, as some servers
 708                         // will reject it with a 417 and Curl won't auto retry
 709                         // with HTTP 1.0 fallback
 710                         $this->reqHeaders['Expect'] = '';
 711                 } else {
 712                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 713                 }
 714
 715                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 716
 717                 $curlHandle = curl_init( $this->url );
 718
 719                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 720                         throw new MWException( "Error setting curl options." );
 721                 }
 722
 723                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 724                         wfSuppressWarnings();
 725                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 726                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 727                                         "Probably safe_mode or open_basedir is set.\n" );
 728                                 // Continue the processing. If it were in curl_setopt_array,
 729                                 // processing would have halted on its entry
 730                         }
 731                         wfRestoreWarnings();
 732                 }
 733
 734                 if ( false === curl_exec( $curlHandle ) ) {
 735                         $code = curl_error( $curlHandle );
 736
 737                         if ( isset( self::$curlMessageMap[$code] ) ) {
 738                                 $this->status->fatal( self::$curlMessageMap[$code] );
 739                         } else {
 740                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 741                         }
 742                 } else {
 743                         $this->headerList = explode( "\r\n", $this->headerText );
 744                 }
 745
 746                 curl_close( $curlHandle );
 747
 748                 $this->parseHeader();
 749                 $this->setStatus();
 750
 751                 return $this->status;
 752         }
 753
 754         /**
 755          * @return bool
 756          */
 757         public function canFollowRedirects() {
 758                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 759                         wfDebug( "Cannot follow redirects in safe mode\n" );
 760                         return false;
 761                 }
 762
 763                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 764                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 765                         return false;
 766                 }
 767
 768                 return true;
 769         }
 770 }
 771
 772 class PhpHttpRequest extends MWHttpRequest {
 773
 774         /**
 775          * @param $url string
 776          * @return string
 777          */
 778         protected function urlToTcp( $url ) {
 779                 $parsedUrl = parse_url( $url );
 780
 781                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 782         }
 783
 784         public function execute() {
 785                 parent::execute();
 786
 787                 if ( is_array( $this->postData ) ) {
 788                         $this->postData = wfArrayToCGI( $this->postData );
 789                 }
 790
 791                 if ( $this->parsedUrl['scheme'] != 'http' &&
 792                          $this->parsedUrl['scheme'] != 'https' ) {
 793                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 794                 }
 795
 796                 $this->reqHeaders['Accept'] = "*/*";
 797                 if ( $this->method == 'POST' ) {
 798                         // Required for HTTP 1.0 POSTs
 799                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 800                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 801                 }
 802
 803                 $options = array();
 804                 if ( $this->proxy && !$this->noProxy ) {
 805                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 806                         $options['request_fulluri'] = true;
 807                 }
 808
 809                 if ( !$this->followRedirects ) {
 810                         $options['max_redirects'] = 0;
 811                 } else {
 812                         $options['max_redirects'] = $this->maxRedirects;
 813                 }
 814
 815                 $options['method'] = $this->method;
 816                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 817                 // Note that at some future point we may want to support
 818                 // HTTP/1.1, but we'd have to write support for chunking
 819                 // in version of PHP < 5.3.1
 820                 $options['protocol_version'] = "1.0";
 821
 822                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 823                 // Only works on 5.2.10+
 824                 $options['ignore_errors'] = true;
 825
 826                 if ( $this->postData ) {
 827                         $options['content'] = $this->postData;
 828                 }
 829
 830                 $options['timeout'] = $this->timeout;
 831
 832                 $context = stream_context_create( array( 'http' => $options ) );
 833
 834                 $this->headerList = array();
 835                 $reqCount = 0;
 836                 $url = $this->url;
 837
 838                 $result = array();
 839
 840                 do {
 841                         $reqCount++;
 842                         wfSuppressWarnings();
 843                         $fh = fopen( $url, "r", false, $context );
 844                         wfRestoreWarnings();
 845
 846                         if ( !$fh ) {
 847                                 break;
 848                         }
 849
 850                         $result = stream_get_meta_data( $fh );
 851                         $this->headerList = $result['wrapper_data'];
 852                         $this->parseHeader();
 853
 854                         if ( !$this->followRedirects ) {
 855                                 break;
 856                         }
 857
 858                         # Handle manual redirection
 859                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 860                                 break;
 861                         }
 862                         # Check security of URL
 863                         $url = $this->getResponseHeader( "Location" );
 864
 865                         if ( !Http::isValidURI( $url ) ) {
 866                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 867                                 break;
 868                         }
 869                 } while ( true );
 870
 871                 $this->setStatus();
 872
 873                 if ( $fh === false ) {
 874                         $this->status->fatal( 'http-request-error' );
 875                         return $this->status;
 876                 }
 877
 878                 if ( $result['timed_out'] ) {
 879                         $this->status->fatal( 'http-timed-out', $this->url );
 880                         return $this->status;
 881                 }
 882
 883                 // If everything went OK, or we recieved some error code
 884                 // get the response body content.
 885                 if ( $this->status->isOK()
 886                                 || (int)$this->respStatus >= 300) {
 887                         while ( !feof( $fh ) ) {
 888                                 $buf = fread( $fh, 8192 );
 889
 890                                 if ( $buf === false ) {
 891                                         $this->status->fatal( 'http-read-error' );
 892                                         break;
 893                                 }
 894
 895                                 if ( strlen( $buf ) ) {
 896                                         call_user_func( $this->callback, $fh, $buf );
 897                                 }
 898                         }
 899                 }
 900                 fclose( $fh );
 901
 902                 return $this->status;
 903         }
 904 }