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