includes/HttpFunctions.php

   1 <?php
   2 /**
   3  * Various HTTP related functions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup HTTP
  22  */
  23
  24 /**
  25  * @defgroup HTTP HTTP
  26  */
  27
  28 /**
  29  * Various HTTP related functions
  30  * @ingroup HTTP
  31  */
  32 class Http {
  33         static $httpEngine = false;
  34
  35         /**
  36          * Perform an HTTP request
  37          *
  38          * @param $method String: HTTP method. Usually GET/POST
  39          * @param $url String: full URL to act on. If protocol-relative, will be expanded to an http:// URL
  40          * @param $options Array: options to pass to MWHttpRequest object.
  41          *      Possible keys for the array:
  42          *    - timeout             Timeout length in seconds
  43          *    - postData            An array of key-value pairs or a url-encoded form data
  44          *    - proxy               The proxy to use.
  45          *                          Otherwise it will use $wgHTTPProxy (if set)
  46          *                          Otherwise it will use the environment variable "http_proxy" (if set)
  47          *    - noProxy             Don't use any proxy at all. Takes precedence over proxy value(s).
  48          *    - sslVerifyHost       (curl only) Set to 2 to verify hostname against certificate
  49          *                                  Setting to 1 (or true) will NOT verify the host name. It will
  50          *                                  only check its existence. Setting to 0 (or false) disables entirely.
  51          *    - sslVerifyCert       (curl only) Verify SSL certificate
  52          *    - caInfo              (curl only) Provide CA information
  53          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  54          *    - followRedirects     Whether to follow redirects (defaults to false).
  55          *                                  Note: this should only be used when the target URL is trusted,
  56          *                                  to avoid attacks on intranet services accessible by HTTP.
  57          *    - userAgent           A user agent, if you want to override the default
  58          *                          MediaWiki/$wgVersion
  59          * @return Mixed: (bool)false on failure or a string on success
  60          */
  61         public static function request( $method, $url, $options = array() ) {
  62                 wfDebug( "HTTP: $method: $url\n" );
  63                 $options['method'] = strtoupper( $method );
  64
  65                 if ( !isset( $options['timeout'] ) ) {
  66                         $options['timeout'] = 'default';
  67                 }
  68
  69                 $req = MWHttpRequest::factory( $url, $options );
  70                 $status = $req->execute();
  71
  72                 if ( $status->isOK() ) {
  73                         return $req->getContent();
  74                 } else {
  75                         return false;
  76                 }
  77         }
  78
  79         /**
  80          * Simple wrapper for Http::request( 'GET' )
  81          * @see Http::request()
  82          *
  83          * @param $url
  84          * @param $timeout string
  85          * @param $options array
  86          * @return string
  87          */
  88         public static function get( $url, $timeout = 'default', $options = array() ) {
  89                 $options['timeout'] = $timeout;
  90                 return Http::request( 'GET', $url, $options );
  91         }
  92
  93         /**
  94          * Simple wrapper for Http::request( 'POST' )
  95          * @see Http::request()
  96          *
  97          * @param $url
  98          * @param $options array
  99          * @return string
 100          */
 101         public static function post( $url, $options = array() ) {
 102                 return Http::request( 'POST', $url, $options );
 103         }
 104
 105         /**
 106          * Check if the URL can be served by localhost
 107          *
 108          * @param $url String: full url to check
 109          * @return Boolean
 110          */
 111         public static function isLocalURL( $url ) {
 112                 global $wgCommandLineMode, $wgConf;
 113
 114                 if ( $wgCommandLineMode ) {
 115                         return false;
 116                 }
 117
 118                 // Extract host part
 119                 $matches = array();
 120                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
 121                         $host = $matches[1];
 122                         // Split up dotwise
 123                         $domainParts = explode( '.', $host );
 124                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
 125                         $domainParts = array_reverse( $domainParts );
 126
 127                         $domain = '';
 128                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
 129                                 $domainPart = $domainParts[$i];
 130                                 if ( $i == 0 ) {
 131                                         $domain = $domainPart;
 132                                 } else {
 133                                         $domain = $domainPart . '.' . $domain;
 134                                 }
 135
 136                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 137                                         return true;
 138                                 }
 139                         }
 140                 }
 141
 142                 return false;
 143         }
 144
 145         /**
 146          * A standard user-agent we can use for external requests.
 147          * @return String
 148          */
 149         public static function userAgent() {
 150                 global $wgVersion;
 151                 return "MediaWiki/$wgVersion";
 152         }
 153
 154         /**
 155          * Checks that the given URI is a valid one. Hardcoding the
 156          * protocols, because we only want protocols that both cURL
 157          * and php support.
 158          *
 159          * file:// should not be allowed here for security purpose (r67684)
 160          *
 161          * @todo FIXME this is wildly inaccurate and fails to actually check most stuff
 162          *
 163          * @param $uri Mixed: URI to check for validity
 164          * @return Boolean
 165          */
 166         public static function isValidURI( $uri ) {
 167                 return preg_match(
 168                         '/^https?:\/\/[^\/\s]\S*$/D',
 169                         $uri
 170                 );
 171         }
 172 }
 173
 174 /**
 175  * This wrapper class will call out to curl (if available) or fallback
 176  * to regular PHP if necessary for handling internal HTTP requests.
 177  *
 178  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 179  * PHP's HTTP extension.
 180  */
 181 class MWHttpRequest {
 182         const SUPPORTS_FILE_POSTS = false;
 183
 184         protected $content;
 185         protected $timeout = 'default';
 186         protected $headersOnly = null;
 187         protected $postData = null;
 188         protected $proxy = null;
 189         protected $noProxy = false;
 190         /**
 191          * Parameter passed to Curl that specifies whether
 192          * to validate SSL certificates.
 193          *
 194          * Setting to 0 disables entirely. Setting to 1 checks
 195          * the existence of a CN, but doesn't verify it. Setting
 196          * to 2 (the default) actually verifies the host.
 197          */
 198         protected $sslVerifyHost = 2;
 199         protected $sslVerifyCert = true;
 200         protected $caInfo = null;
 201         protected $method = "GET";
 202         protected $reqHeaders = array();
 203         protected $url;
 204         protected $parsedUrl;
 205         protected $callback;
 206         protected $maxRedirects = 5;
 207         protected $followRedirects = false;
 208
 209         /**
 210          * @var  CookieJar
 211          */
 212         protected $cookieJar;
 213
 214         protected $headerList = array();
 215         protected $respVersion = "0.9";
 216         protected $respStatus = "200 Ok";
 217         protected $respHeaders = array();
 218
 219         public $status;
 220
 221         /**
 222          * @param $url String: url to use. If protocol-relative, will be expanded to an http:// URL
 223          * @param $options Array: (optional) extra params to pass (see Http::request())
 224          */
 225         protected function __construct( $url, $options = array() ) {
 226                 global $wgHTTPTimeout;
 227
 228                 $this->url = wfExpandUrl( $url, PROTO_HTTP );
 229                 $this->parsedUrl = wfParseUrl( $this->url );
 230
 231                 if ( !$this->parsedUrl || !Http::isValidURI( $this->url ) ) {
 232                         $this->status = Status::newFatal( 'http-invalid-url' );
 233                 } else {
 234                         $this->status = Status::newGood( 100 ); // continue
 235                 }
 236
 237                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 238                         $this->timeout = $options['timeout'];
 239                 } else {
 240                         $this->timeout = $wgHTTPTimeout;
 241                 }
 242                 if( isset( $options['userAgent'] ) ) {
 243                         $this->setUserAgent( $options['userAgent'] );
 244                 }
 245
 246                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 247                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 248
 249                 foreach ( $members as $o ) {
 250                         if ( isset( $options[$o] ) ) {
 251                                 // ensure that MWHttpRequest::method is always
 252                                 // uppercased. Bug 36137
 253                                 if ( $o == 'method' ) {
 254                                         $options[$o] = strtoupper( $options[$o] );
 255                                 }
 256                                 $this->$o = $options[$o];
 257                         }
 258                 }
 259
 260                 if ( $this->noProxy ) {
 261                         $this->proxy = ''; // noProxy takes precedence
 262                 }
 263         }
 264
 265         /**
 266          * Simple function to test if we can make any sort of requests at all, using
 267          * cURL or fopen()
 268          * @return bool
 269          */
 270         public static function canMakeRequests() {
 271                 return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
 272         }
 273
 274         /**
 275          * Generate a new request object
 276          * @param $url String: url to use
 277          * @param $options Array: (optional) extra params to pass (see Http::request())
 278          * @throws MWException
 279          * @return CurlHttpRequest|PhpHttpRequest
 280          * @see MWHttpRequest::__construct
 281          */
 282         public static function factory( $url, $options = null ) {
 283                 if ( !Http::$httpEngine ) {
 284                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 285                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 286                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 287                                                                    ' Http::$httpEngine is set to "curl"' );
 288                 }
 289
 290                 switch( Http::$httpEngine ) {
 291                         case 'curl':
 292                                 return new CurlHttpRequest( $url, $options );
 293                         case 'php':
 294                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 295                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 296                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 297                                 }
 298                                 return new PhpHttpRequest( $url, $options );
 299                         default:
 300                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 301                 }
 302         }
 303
 304         /**
 305          * Get the body, or content, of the response to the request
 306          *
 307          * @return String
 308          */
 309         public function getContent() {
 310                 return $this->content;
 311         }
 312
 313         /**
 314          * Set the parameters of the request
 315
 316          * @param $args Array
 317          * @todo overload the args param
 318          */
 319         public function setData( $args ) {
 320                 $this->postData = $args;
 321         }
 322
 323         /**
 324          * Take care of setting up the proxy (do nothing if "noProxy" is set)
 325          *
 326          * @return void
 327          */
 328         public function proxySetup() {
 329                 global $wgHTTPProxy;
 330
 331                 if ( $this->proxy || !$this->noProxy ) {
 332                         return;
 333                 }
 334
 335                 if ( Http::isLocalURL( $this->url ) || $this->noProxy ) {
 336                         $this->proxy = '';
 337                 } elseif ( $wgHTTPProxy ) {
 338                         $this->proxy = $wgHTTPProxy ;
 339                 } elseif ( getenv( "http_proxy" ) ) {
 340                         $this->proxy = getenv( "http_proxy" );
 341                 }
 342         }
 343
 344         /**
 345          * Set the refererer header
 346          */
 347         public function setReferer( $url ) {
 348                 $this->setHeader( 'Referer', $url );
 349         }
 350
 351         /**
 352          * Set the user agent
 353          * @param $UA string
 354          */
 355         public function setUserAgent( $UA ) {
 356                 $this->setHeader( 'User-Agent', $UA );
 357         }
 358
 359         /**
 360          * Set an arbitrary header
 361          * @param $name
 362          * @param $value
 363          */
 364         public function setHeader( $name, $value ) {
 365                 // I feel like I should normalize the case here...
 366                 $this->reqHeaders[$name] = $value;
 367         }
 368
 369         /**
 370          * Get an array of the headers
 371          * @return array
 372          */
 373         public function getHeaderList() {
 374                 $list = array();
 375
 376                 if ( $this->cookieJar ) {
 377                         $this->reqHeaders['Cookie'] =
 378                                 $this->cookieJar->serializeToHttpRequest(
 379                                         $this->parsedUrl['path'],
 380                                         $this->parsedUrl['host']
 381                                 );
 382                 }
 383
 384                 foreach ( $this->reqHeaders as $name => $value ) {
 385                         $list[] = "$name: $value";
 386                 }
 387
 388                 return $list;
 389         }
 390
 391         /**
 392          * Set a read callback to accept data read from the HTTP request.
 393          * By default, data is appended to an internal buffer which can be
 394          * retrieved through $req->getContent().
 395          *
 396          * To handle data as it comes in -- especially for large files that
 397          * would not fit in memory -- you can instead set your own callback,
 398          * in the form function($resource, $buffer) where the first parameter
 399          * is the low-level resource being read (implementation specific),
 400          * and the second parameter is the data buffer.
 401          *
 402          * You MUST return the number of bytes handled in the buffer; if fewer
 403          * bytes are reported handled than were passed to you, the HTTP fetch
 404          * will be aborted.
 405          *
 406          * @param $callback Callback
 407          * @throws MWException
 408          */
 409         public function setCallback( $callback ) {
 410                 if ( !is_callable( $callback ) ) {
 411                         throw new MWException( 'Invalid MwHttpRequest callback' );
 412                 }
 413                 $this->callback = $callback;
 414         }
 415
 416         /**
 417          * A generic callback to read the body of the response from a remote
 418          * server.
 419          *
 420          * @param $fh handle
 421          * @param $content String
 422          * @return int
 423          */
 424         public function read( $fh, $content ) {
 425                 $this->content .= $content;
 426                 return strlen( $content );
 427         }
 428
 429         /**
 430          * Take care of whatever is necessary to perform the URI request.
 431          *
 432          * @return Status
 433          */
 434         public function execute() {
 435                 global $wgTitle;
 436
 437                 $this->content = "";
 438
 439                 if ( strtoupper( $this->method ) == "HEAD" ) {
 440                         $this->headersOnly = true;
 441                 }
 442
 443                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 444                         $this->setReferer( wfExpandUrl( $wgTitle->getFullURL(), PROTO_CURRENT ) );
 445                 }
 446
 447                 $this->proxySetup(); // set up any proxy as needed
 448
 449                 if ( !$this->callback ) {
 450                         $this->setCallback( array( $this, 'read' ) );
 451                 }
 452
 453                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 454                         $this->setUserAgent( Http::userAgent() );
 455                 }
 456         }
 457
 458         /**
 459          * Parses the headers, including the HTTP status code and any
 460          * Set-Cookie headers.  This function expectes the headers to be
 461          * found in an array in the member variable headerList.
 462          */
 463         protected function parseHeader() {
 464                 $lastname = "";
 465
 466                 foreach ( $this->headerList as $header ) {
 467                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 468                                 $this->respVersion = $match[1];
 469                                 $this->respStatus = $match[2];
 470                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 471                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 472                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 473                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 474                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 475                                 $lastname = strtolower( $match[1] );
 476                         }
 477                 }
 478
 479                 $this->parseCookies();
 480         }
 481
 482         /**
 483          * Sets HTTPRequest status member to a fatal value with the error
 484          * message if the returned integer value of the status code was
 485          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 486          * RFC2616, section 10,
 487          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 488          * list of status codes.)
 489          */
 490         protected function setStatus() {
 491                 if ( !$this->respHeaders ) {
 492                         $this->parseHeader();
 493                 }
 494
 495                 if ( (int)$this->respStatus > 399 ) {
 496                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 497                         $this->status->fatal( "http-bad-status", $code, $message );
 498                 }
 499         }
 500
 501         /**
 502          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 503          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 504          * for a list of status codes.)
 505          *
 506          * @return Integer
 507          */
 508         public function getStatus() {
 509                 if ( !$this->respHeaders ) {
 510                         $this->parseHeader();
 511                 }
 512
 513                 return (int)$this->respStatus;
 514         }
 515
 516
 517         /**
 518          * Returns true if the last status code was a redirect.
 519          *
 520          * @return Boolean
 521          */
 522         public function isRedirect() {
 523                 if ( !$this->respHeaders ) {
 524                         $this->parseHeader();
 525                 }
 526
 527                 $status = (int)$this->respStatus;
 528
 529                 if ( $status >= 300 && $status <= 303 ) {
 530                         return true;
 531                 }
 532
 533                 return false;
 534         }
 535
 536         /**
 537          * Returns an associative array of response headers after the
 538          * request has been executed.  Because some headers
 539          * (e.g. Set-Cookie) can appear more than once the, each value of
 540          * the associative array is an array of the values given.
 541          *
 542          * @return Array
 543          */
 544         public function getResponseHeaders() {
 545                 if ( !$this->respHeaders ) {
 546                         $this->parseHeader();
 547                 }
 548
 549                 return $this->respHeaders;
 550         }
 551
 552         /**
 553          * Returns the value of the given response header.
 554          *
 555          * @param $header String
 556          * @return String
 557          */
 558         public function getResponseHeader( $header ) {
 559                 if ( !$this->respHeaders ) {
 560                         $this->parseHeader();
 561                 }
 562
 563                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 564                         $v = $this->respHeaders[strtolower ( $header ) ];
 565                         return $v[count( $v ) - 1];
 566                 }
 567
 568                 return null;
 569         }
 570
 571         /**
 572          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 573          *
 574          * @param $jar CookieJar
 575          */
 576         public function setCookieJar( $jar ) {
 577                 $this->cookieJar = $jar;
 578         }
 579
 580         /**
 581          * Returns the cookie jar in use.
 582          *
 583          * @return CookieJar
 584          */
 585         public function getCookieJar() {
 586                 if ( !$this->respHeaders ) {
 587                         $this->parseHeader();
 588                 }
 589
 590                 return $this->cookieJar;
 591         }
 592
 593         /**
 594          * Sets a cookie. Used before a request to set up any individual
 595          * cookies. Used internally after a request to parse the
 596          * Set-Cookie headers.
 597          * @see Cookie::set
 598          * @param $name
 599          * @param $value null
 600          * @param $attr null
 601          */
 602         public function setCookie( $name, $value = null, $attr = null ) {
 603                 if ( !$this->cookieJar ) {
 604                         $this->cookieJar = new CookieJar;
 605                 }
 606
 607                 $this->cookieJar->setCookie( $name, $value, $attr );
 608         }
 609
 610         /**
 611          * Parse the cookies in the response headers and store them in the cookie jar.
 612          */
 613         protected function parseCookies() {
 614                 if ( !$this->cookieJar ) {
 615                         $this->cookieJar = new CookieJar;
 616                 }
 617
 618                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 619                         $url = parse_url( $this->getFinalUrl() );
 620                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 621                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 622                         }
 623                 }
 624         }
 625
 626         /**
 627          * Returns the final URL after all redirections.
 628          *
 629          * Relative values of the "Location" header are incorrect as stated in RFC, however they do happen and modern browsers support them.
 630          * This function loops backwards through all locations in order to build the proper absolute URI - Marooned at wikia-inc.com
 631          *
 632          * Note that the multiple Location: headers are an artifact of CURL -- they
 633          * shouldn't actually get returned this way. Rewrite this when bug 29232 is
 634          * taken care of (high-level redirect handling rewrite).
 635          *
 636          * @return string
 637          */
 638         public function getFinalUrl() {
 639                 $headers = $this->getResponseHeaders();
 640
 641                 //return full url (fix for incorrect but handled relative location)
 642                 if ( isset( $headers[ 'location' ] ) ) {
 643                         $locations = $headers[ 'location' ];
 644                         $domain = '';
 645                         $foundRelativeURI = false;
 646                         $countLocations = count($locations);
 647
 648                         for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
 649                                 $url = parse_url( $locations[ $i ] );
 650
 651                                 if ( isset($url[ 'host' ]) ) {
 652                                         $domain = $url[ 'scheme' ] . '://' . $url[ 'host' ];
 653                                         break;  //found correct URI (with host)
 654                                 } else {
 655                                         $foundRelativeURI = true;
 656                                 }
 657                         }
 658
 659                         if ( $foundRelativeURI ) {
 660                                 if ( $domain ) {
 661                                         return $domain . $locations[ $countLocations - 1 ];
 662                                 } else {
 663                                         $url = parse_url( $this->url );
 664                                         if ( isset($url[ 'host' ]) ) {
 665                                                 return $url[ 'scheme' ] . '://' . $url[ 'host' ] . $locations[ $countLocations - 1 ];
 666                                         }
 667                                 }
 668                         } else {
 669                                 return $locations[ $countLocations - 1 ];
 670                         }
 671                 }
 672
 673                 return $this->url;
 674         }
 675
 676         /**
 677          * Returns true if the backend can follow redirects. Overridden by the
 678          * child classes.
 679          * @return bool
 680          */
 681         public function canFollowRedirects() {
 682                 return true;
 683         }
 684 }
 685
 686 /**
 687  * MWHttpRequest implemented using internal curl compiled into PHP
 688  */
 689 class CurlHttpRequest extends MWHttpRequest {
 690         const SUPPORTS_FILE_POSTS = true;
 691
 692         static $curlMessageMap = array(
 693                 6 => 'http-host-unreachable',
 694                 28 => 'http-timed-out'
 695         );
 696
 697         protected $curlOptions = array();
 698         protected $headerText = "";
 699
 700         /**
 701          * @param $fh
 702          * @param $content
 703          * @return int
 704          */
 705         protected function readHeader( $fh, $content ) {
 706                 $this->headerText .= $content;
 707                 return strlen( $content );
 708         }
 709
 710         public function execute() {
 711                 parent::execute();
 712
 713                 if ( !$this->status->isOK() ) {
 714                         return $this->status;
 715                 }
 716
 717                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 718                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 719                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 720                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 721                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 722                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 723                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 724
 725                 /* not sure these two are actually necessary */
 726                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 727                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 728                 }
 729                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 730
 731                 if ( isset( $this->sslVerifyHost ) ) {
 732                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 733                 }
 734
 735                 if ( isset( $this->sslVerifyCert ) ) {
 736                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 737                 }
 738
 739                 if ( $this->caInfo ) {
 740                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 741                 }
 742
 743                 if ( $this->headersOnly ) {
 744                         $this->curlOptions[CURLOPT_NOBODY] = true;
 745                         $this->curlOptions[CURLOPT_HEADER] = true;
 746                 } elseif ( $this->method == 'POST' ) {
 747                         $this->curlOptions[CURLOPT_POST] = true;
 748                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 749                         // Suppress 'Expect: 100-continue' header, as some servers
 750                         // will reject it with a 417 and Curl won't auto retry
 751                         // with HTTP 1.0 fallback
 752                         $this->reqHeaders['Expect'] = '';
 753                 } else {
 754                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 755                 }
 756
 757                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 758
 759                 $curlHandle = curl_init( $this->url );
 760
 761                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 762                         throw new MWException( "Error setting curl options." );
 763                 }
 764
 765                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 766                         wfSuppressWarnings();
 767                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 768                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 769                                         "Probably safe_mode or open_basedir is set.\n" );
 770                                 // Continue the processing. If it were in curl_setopt_array,
 771                                 // processing would have halted on its entry
 772                         }
 773                         wfRestoreWarnings();
 774                 }
 775
 776                 if ( false === curl_exec( $curlHandle ) ) {
 777                         $code = curl_error( $curlHandle );
 778
 779                         if ( isset( self::$curlMessageMap[$code] ) ) {
 780                                 $this->status->fatal( self::$curlMessageMap[$code] );
 781                         } else {
 782                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 783                         }
 784                 } else {
 785                         $this->headerList = explode( "\r\n", $this->headerText );
 786                 }
 787
 788                 curl_close( $curlHandle );
 789
 790                 $this->parseHeader();
 791                 $this->setStatus();
 792
 793                 return $this->status;
 794         }
 795
 796         /**
 797          * @return bool
 798          */
 799         public function canFollowRedirects() {
 800                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 801                         wfDebug( "Cannot follow redirects in safe mode\n" );
 802                         return false;
 803                 }
 804
 805                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 806                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 807                         return false;
 808                 }
 809
 810                 return true;
 811         }
 812 }
 813
 814 class PhpHttpRequest extends MWHttpRequest {
 815
 816         /**
 817          * @param $url string
 818          * @return string
 819          */
 820         protected function urlToTcp( $url ) {
 821                 $parsedUrl = parse_url( $url );
 822
 823                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 824         }
 825
 826         public function execute() {
 827                 parent::execute();
 828
 829                 if ( is_array( $this->postData ) ) {
 830                         $this->postData = wfArrayToCGI( $this->postData );
 831                 }
 832
 833                 if ( $this->parsedUrl['scheme'] != 'http' &&
 834                          $this->parsedUrl['scheme'] != 'https' ) {
 835                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 836                 }
 837
 838                 $this->reqHeaders['Accept'] = "*/*";
 839                 if ( $this->method == 'POST' ) {
 840                         // Required for HTTP 1.0 POSTs
 841                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 842                         if( !isset( $this->reqHeaders['Content-Type'] ) ) {
 843                                 $this->reqHeaders['Content-Type'] = "application/x-www-form-urlencoded";
 844                         }
 845                 }
 846
 847                 $options = array();
 848                 if ( $this->proxy ) {
 849                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 850                         $options['request_fulluri'] = true;
 851                 }
 852
 853                 if ( !$this->followRedirects ) {
 854                         $options['max_redirects'] = 0;
 855                 } else {
 856                         $options['max_redirects'] = $this->maxRedirects;
 857                 }
 858
 859                 $options['method'] = $this->method;
 860                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 861                 // Note that at some future point we may want to support
 862                 // HTTP/1.1, but we'd have to write support for chunking
 863                 // in version of PHP < 5.3.1
 864                 $options['protocol_version'] = "1.0";
 865
 866                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 867                 // Only works on 5.2.10+
 868                 $options['ignore_errors'] = true;
 869
 870                 if ( $this->postData ) {
 871                         $options['content'] = $this->postData;
 872                 }
 873
 874                 $options['timeout'] = $this->timeout;
 875
 876                 $context = stream_context_create( array( 'http' => $options ) );
 877
 878                 $this->headerList = array();
 879                 $reqCount = 0;
 880                 $url = $this->url;
 881
 882                 $result = array();
 883
 884                 do {
 885                         $reqCount++;
 886                         wfSuppressWarnings();
 887                         $fh = fopen( $url, "r", false, $context );
 888                         wfRestoreWarnings();
 889
 890                         if ( !$fh ) {
 891                                 break;
 892                         }
 893
 894                         $result = stream_get_meta_data( $fh );
 895                         $this->headerList = $result['wrapper_data'];
 896                         $this->parseHeader();
 897
 898                         if ( !$this->followRedirects ) {
 899                                 break;
 900                         }
 901
 902                         # Handle manual redirection
 903                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 904                                 break;
 905                         }
 906                         # Check security of URL
 907                         $url = $this->getResponseHeader( "Location" );
 908
 909                         if ( !Http::isValidURI( $url ) ) {
 910                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 911                                 break;
 912                         }
 913                 } while ( true );
 914
 915                 $this->setStatus();
 916
 917                 if ( $fh === false ) {
 918                         $this->status->fatal( 'http-request-error' );
 919                         return $this->status;
 920                 }
 921
 922                 if ( $result['timed_out'] ) {
 923                         $this->status->fatal( 'http-timed-out', $this->url );
 924                         return $this->status;
 925                 }
 926
 927                 // If everything went OK, or we received some error code
 928                 // get the response body content.
 929                 if ( $this->status->isOK()
 930                                 || (int)$this->respStatus >= 300) {
 931                         while ( !feof( $fh ) ) {
 932                                 $buf = fread( $fh, 8192 );
 933
 934                                 if ( $buf === false ) {
 935                                         $this->status->fatal( 'http-read-error' );
 936                                         break;
 937                                 }
 938
 939                                 if ( strlen( $buf ) ) {
 940                                         call_user_func( $this->callback, $fh, $buf );
 941                                 }
 942                         }
 943                 }
 944                 fclose( $fh );
 945
 946                 return $this->status;
 947         }
 948 }