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 there is an explicit proxy set and proxies are not disabled, then use it
 332                 if ( $this->proxy && !$this->noProxy ) {
 333                         return;
 334                 }
 335
 336                 // Otherwise, fallback to $wgHTTPProxy/http_proxy (when set) if this is not a machine
 337                 // local URL and proxies are not disabled
 338                 if ( Http::isLocalURL( $this->url ) || $this->noProxy ) {
 339                         $this->proxy = '';
 340                 } elseif ( $wgHTTPProxy ) {
 341                         $this->proxy = $wgHTTPProxy;
 342                 } elseif ( getenv( "http_proxy" ) ) {
 343                         $this->proxy = getenv( "http_proxy" );
 344                 }
 345         }
 346
 347         /**
 348          * Set the refererer header
 349          */
 350         public function setReferer( $url ) {
 351                 $this->setHeader( 'Referer', $url );
 352         }
 353
 354         /**
 355          * Set the user agent
 356          * @param $UA string
 357          */
 358         public function setUserAgent( $UA ) {
 359                 $this->setHeader( 'User-Agent', $UA );
 360         }
 361
 362         /**
 363          * Set an arbitrary header
 364          * @param $name
 365          * @param $value
 366          */
 367         public function setHeader( $name, $value ) {
 368                 // I feel like I should normalize the case here...
 369                 $this->reqHeaders[$name] = $value;
 370         }
 371
 372         /**
 373          * Get an array of the headers
 374          * @return array
 375          */
 376         public function getHeaderList() {
 377                 $list = array();
 378
 379                 if ( $this->cookieJar ) {
 380                         $this->reqHeaders['Cookie'] =
 381                                 $this->cookieJar->serializeToHttpRequest(
 382                                         $this->parsedUrl['path'],
 383                                         $this->parsedUrl['host']
 384                                 );
 385                 }
 386
 387                 foreach ( $this->reqHeaders as $name => $value ) {
 388                         $list[] = "$name: $value";
 389                 }
 390
 391                 return $list;
 392         }
 393
 394         /**
 395          * Set a read callback to accept data read from the HTTP request.
 396          * By default, data is appended to an internal buffer which can be
 397          * retrieved through $req->getContent().
 398          *
 399          * To handle data as it comes in -- especially for large files that
 400          * would not fit in memory -- you can instead set your own callback,
 401          * in the form function($resource, $buffer) where the first parameter
 402          * is the low-level resource being read (implementation specific),
 403          * and the second parameter is the data buffer.
 404          *
 405          * You MUST return the number of bytes handled in the buffer; if fewer
 406          * bytes are reported handled than were passed to you, the HTTP fetch
 407          * will be aborted.
 408          *
 409          * @param $callback Callback
 410          * @throws MWException
 411          */
 412         public function setCallback( $callback ) {
 413                 if ( !is_callable( $callback ) ) {
 414                         throw new MWException( 'Invalid MwHttpRequest callback' );
 415                 }
 416                 $this->callback = $callback;
 417         }
 418
 419         /**
 420          * A generic callback to read the body of the response from a remote
 421          * server.
 422          *
 423          * @param $fh handle
 424          * @param $content String
 425          * @return int
 426          */
 427         public function read( $fh, $content ) {
 428                 $this->content .= $content;
 429                 return strlen( $content );
 430         }
 431
 432         /**
 433          * Take care of whatever is necessary to perform the URI request.
 434          *
 435          * @return Status
 436          */
 437         public function execute() {
 438                 global $wgTitle;
 439
 440                 $this->content = "";
 441
 442                 if ( strtoupper( $this->method ) == "HEAD" ) {
 443                         $this->headersOnly = true;
 444                 }
 445
 446                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 447                         $this->setReferer( wfExpandUrl( $wgTitle->getFullURL(), PROTO_CURRENT ) );
 448                 }
 449
 450                 $this->proxySetup(); // set up any proxy as needed
 451
 452                 if ( !$this->callback ) {
 453                         $this->setCallback( array( $this, 'read' ) );
 454                 }
 455
 456                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 457                         $this->setUserAgent( Http::userAgent() );
 458                 }
 459         }
 460
 461         /**
 462          * Parses the headers, including the HTTP status code and any
 463          * Set-Cookie headers.  This function expectes the headers to be
 464          * found in an array in the member variable headerList.
 465          */
 466         protected function parseHeader() {
 467                 $lastname = "";
 468
 469                 foreach ( $this->headerList as $header ) {
 470                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 471                                 $this->respVersion = $match[1];
 472                                 $this->respStatus = $match[2];
 473                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 474                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 475                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 476                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 477                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 478                                 $lastname = strtolower( $match[1] );
 479                         }
 480                 }
 481
 482                 $this->parseCookies();
 483         }
 484
 485         /**
 486          * Sets HTTPRequest status member to a fatal value with the error
 487          * message if the returned integer value of the status code was
 488          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 489          * RFC2616, section 10,
 490          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 491          * list of status codes.)
 492          */
 493         protected function setStatus() {
 494                 if ( !$this->respHeaders ) {
 495                         $this->parseHeader();
 496                 }
 497
 498                 if ( (int)$this->respStatus > 399 ) {
 499                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 500                         $this->status->fatal( "http-bad-status", $code, $message );
 501                 }
 502         }
 503
 504         /**
 505          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 506          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 507          * for a list of status codes.)
 508          *
 509          * @return Integer
 510          */
 511         public function getStatus() {
 512                 if ( !$this->respHeaders ) {
 513                         $this->parseHeader();
 514                 }
 515
 516                 return (int)$this->respStatus;
 517         }
 518
 519
 520         /**
 521          * Returns true if the last status code was a redirect.
 522          *
 523          * @return Boolean
 524          */
 525         public function isRedirect() {
 526                 if ( !$this->respHeaders ) {
 527                         $this->parseHeader();
 528                 }
 529
 530                 $status = (int)$this->respStatus;
 531
 532                 if ( $status >= 300 && $status <= 303 ) {
 533                         return true;
 534                 }
 535
 536                 return false;
 537         }
 538
 539         /**
 540          * Returns an associative array of response headers after the
 541          * request has been executed.  Because some headers
 542          * (e.g. Set-Cookie) can appear more than once the, each value of
 543          * the associative array is an array of the values given.
 544          *
 545          * @return Array
 546          */
 547         public function getResponseHeaders() {
 548                 if ( !$this->respHeaders ) {
 549                         $this->parseHeader();
 550                 }
 551
 552                 return $this->respHeaders;
 553         }
 554
 555         /**
 556          * Returns the value of the given response header.
 557          *
 558          * @param $header String
 559          * @return String
 560          */
 561         public function getResponseHeader( $header ) {
 562                 if ( !$this->respHeaders ) {
 563                         $this->parseHeader();
 564                 }
 565
 566                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 567                         $v = $this->respHeaders[strtolower ( $header ) ];
 568                         return $v[count( $v ) - 1];
 569                 }
 570
 571                 return null;
 572         }
 573
 574         /**
 575          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 576          *
 577          * @param $jar CookieJar
 578          */
 579         public function setCookieJar( $jar ) {
 580                 $this->cookieJar = $jar;
 581         }
 582
 583         /**
 584          * Returns the cookie jar in use.
 585          *
 586          * @return CookieJar
 587          */
 588         public function getCookieJar() {
 589                 if ( !$this->respHeaders ) {
 590                         $this->parseHeader();
 591                 }
 592
 593                 return $this->cookieJar;
 594         }
 595
 596         /**
 597          * Sets a cookie. Used before a request to set up any individual
 598          * cookies. Used internally after a request to parse the
 599          * Set-Cookie headers.
 600          * @see Cookie::set
 601          * @param $name
 602          * @param $value null
 603          * @param $attr null
 604          */
 605         public function setCookie( $name, $value = null, $attr = null ) {
 606                 if ( !$this->cookieJar ) {
 607                         $this->cookieJar = new CookieJar;
 608                 }
 609
 610                 $this->cookieJar->setCookie( $name, $value, $attr );
 611         }
 612
 613         /**
 614          * Parse the cookies in the response headers and store them in the cookie jar.
 615          */
 616         protected function parseCookies() {
 617                 if ( !$this->cookieJar ) {
 618                         $this->cookieJar = new CookieJar;
 619                 }
 620
 621                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 622                         $url = parse_url( $this->getFinalUrl() );
 623                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 624                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 625                         }
 626                 }
 627         }
 628
 629         /**
 630          * Returns the final URL after all redirections.
 631          *
 632          * Relative values of the "Location" header are incorrect as stated in RFC, however they do happen and modern browsers support them.
 633          * This function loops backwards through all locations in order to build the proper absolute URI - Marooned at wikia-inc.com
 634          *
 635          * Note that the multiple Location: headers are an artifact of CURL -- they
 636          * shouldn't actually get returned this way. Rewrite this when bug 29232 is
 637          * taken care of (high-level redirect handling rewrite).
 638          *
 639          * @return string
 640          */
 641         public function getFinalUrl() {
 642                 $headers = $this->getResponseHeaders();
 643
 644                 //return full url (fix for incorrect but handled relative location)
 645                 if ( isset( $headers[ 'location' ] ) ) {
 646                         $locations = $headers[ 'location' ];
 647                         $domain = '';
 648                         $foundRelativeURI = false;
 649                         $countLocations = count( $locations );
 650
 651                         for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
 652                                 $url = parse_url( $locations[ $i ] );
 653
 654                                 if ( isset( $url['host'] ) ) {
 655                                         $domain = $url[ 'scheme' ] . '://' . $url[ 'host' ];
 656                                         break;  //found correct URI (with host)
 657                                 } else {
 658                                         $foundRelativeURI = true;
 659                                 }
 660                         }
 661
 662                         if ( $foundRelativeURI ) {
 663                                 if ( $domain ) {
 664                                         return $domain . $locations[ $countLocations - 1 ];
 665                                 } else {
 666                                         $url = parse_url( $this->url );
 667                                         if ( isset($url[ 'host' ]) ) {
 668                                                 return $url[ 'scheme' ] . '://' . $url[ 'host' ] . $locations[ $countLocations - 1 ];
 669                                         }
 670                                 }
 671                         } else {
 672                                 return $locations[ $countLocations - 1 ];
 673                         }
 674                 }
 675
 676                 return $this->url;
 677         }
 678
 679         /**
 680          * Returns true if the backend can follow redirects. Overridden by the
 681          * child classes.
 682          * @return bool
 683          */
 684         public function canFollowRedirects() {
 685                 return true;
 686         }
 687 }
 688
 689 /**
 690  * MWHttpRequest implemented using internal curl compiled into PHP
 691  */
 692 class CurlHttpRequest extends MWHttpRequest {
 693         const SUPPORTS_FILE_POSTS = true;
 694
 695         static $curlMessageMap = array(
 696                 6 => 'http-host-unreachable',
 697                 28 => 'http-timed-out'
 698         );
 699
 700         protected $curlOptions = array();
 701         protected $headerText = "";
 702
 703         /**
 704          * @param $fh
 705          * @param $content
 706          * @return int
 707          */
 708         protected function readHeader( $fh, $content ) {
 709                 $this->headerText .= $content;
 710                 return strlen( $content );
 711         }
 712
 713         public function execute() {
 714                 parent::execute();
 715
 716                 if ( !$this->status->isOK() ) {
 717                         return $this->status;
 718                 }
 719
 720                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 721                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 722                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 723                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 724                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 725                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 726                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 727
 728                 /* not sure these two are actually necessary */
 729                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 730                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 731                 }
 732                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 733
 734                 if ( isset( $this->sslVerifyHost ) ) {
 735                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 736                 }
 737
 738                 if ( isset( $this->sslVerifyCert ) ) {
 739                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 740                 }
 741
 742                 if ( $this->caInfo ) {
 743                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 744                 }
 745
 746                 if ( $this->headersOnly ) {
 747                         $this->curlOptions[CURLOPT_NOBODY] = true;
 748                         $this->curlOptions[CURLOPT_HEADER] = true;
 749                 } elseif ( $this->method == 'POST' ) {
 750                         $this->curlOptions[CURLOPT_POST] = true;
 751                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 752                         // Suppress 'Expect: 100-continue' header, as some servers
 753                         // will reject it with a 417 and Curl won't auto retry
 754                         // with HTTP 1.0 fallback
 755                         $this->reqHeaders['Expect'] = '';
 756                 } else {
 757                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 758                 }
 759
 760                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 761
 762                 $curlHandle = curl_init( $this->url );
 763
 764                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 765                         throw new MWException( "Error setting curl options." );
 766                 }
 767
 768                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 769                         wfSuppressWarnings();
 770                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 771                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 772                                         "Probably safe_mode or open_basedir is set.\n" );
 773                                 // Continue the processing. If it were in curl_setopt_array,
 774                                 // processing would have halted on its entry
 775                         }
 776                         wfRestoreWarnings();
 777                 }
 778
 779                 if ( false === curl_exec( $curlHandle ) ) {
 780                         $code = curl_error( $curlHandle );
 781
 782                         if ( isset( self::$curlMessageMap[$code] ) ) {
 783                                 $this->status->fatal( self::$curlMessageMap[$code] );
 784                         } else {
 785                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 786                         }
 787                 } else {
 788                         $this->headerList = explode( "\r\n", $this->headerText );
 789                 }
 790
 791                 curl_close( $curlHandle );
 792
 793                 $this->parseHeader();
 794                 $this->setStatus();
 795
 796                 return $this->status;
 797         }
 798
 799         /**
 800          * @return bool
 801          */
 802         public function canFollowRedirects() {
 803                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 804                         wfDebug( "Cannot follow redirects in safe mode\n" );
 805                         return false;
 806                 }
 807
 808                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 809                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 810                         return false;
 811                 }
 812
 813                 return true;
 814         }
 815 }
 816
 817 class PhpHttpRequest extends MWHttpRequest {
 818
 819         /**
 820          * @param $url string
 821          * @return string
 822          */
 823         protected function urlToTcp( $url ) {
 824                 $parsedUrl = parse_url( $url );
 825
 826                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 827         }
 828
 829         public function execute() {
 830                 parent::execute();
 831
 832                 if ( is_array( $this->postData ) ) {
 833                         $this->postData = wfArrayToCgi( $this->postData );
 834                 }
 835
 836                 if ( $this->parsedUrl['scheme'] != 'http' &&
 837                          $this->parsedUrl['scheme'] != 'https' ) {
 838                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 839                 }
 840
 841                 $this->reqHeaders['Accept'] = "*/*";
 842                 if ( $this->method == 'POST' ) {
 843                         // Required for HTTP 1.0 POSTs
 844                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 845                         if( !isset( $this->reqHeaders['Content-Type'] ) ) {
 846                                 $this->reqHeaders['Content-Type'] = "application/x-www-form-urlencoded";
 847                         }
 848                 }
 849
 850                 $options = array();
 851                 if ( $this->proxy ) {
 852                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 853                         $options['request_fulluri'] = true;
 854                 }
 855
 856                 if ( !$this->followRedirects ) {
 857                         $options['max_redirects'] = 0;
 858                 } else {
 859                         $options['max_redirects'] = $this->maxRedirects;
 860                 }
 861
 862                 $options['method'] = $this->method;
 863                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 864                 // Note that at some future point we may want to support
 865                 // HTTP/1.1, but we'd have to write support for chunking
 866                 // in version of PHP < 5.3.1
 867                 $options['protocol_version'] = "1.0";
 868
 869                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 870                 // Only works on 5.2.10+
 871                 $options['ignore_errors'] = true;
 872
 873                 if ( $this->postData ) {
 874                         $options['content'] = $this->postData;
 875                 }
 876
 877                 $options['timeout'] = $this->timeout;
 878
 879                 $context = stream_context_create( array( 'http' => $options ) );
 880
 881                 $this->headerList = array();
 882                 $reqCount = 0;
 883                 $url = $this->url;
 884
 885                 $result = array();
 886
 887                 do {
 888                         $reqCount++;
 889                         wfSuppressWarnings();
 890                         $fh = fopen( $url, "r", false, $context );
 891                         wfRestoreWarnings();
 892
 893                         if ( !$fh ) {
 894                                 break;
 895                         }
 896
 897                         $result = stream_get_meta_data( $fh );
 898                         $this->headerList = $result['wrapper_data'];
 899                         $this->parseHeader();
 900
 901                         if ( !$this->followRedirects ) {
 902                                 break;
 903                         }
 904
 905                         # Handle manual redirection
 906                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 907                                 break;
 908                         }
 909                         # Check security of URL
 910                         $url = $this->getResponseHeader( "Location" );
 911
 912                         if ( !Http::isValidURI( $url ) ) {
 913                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 914                                 break;
 915                         }
 916                 } while ( true );
 917
 918                 $this->setStatus();
 919
 920                 if ( $fh === false ) {
 921                         $this->status->fatal( 'http-request-error' );
 922                         return $this->status;
 923                 }
 924
 925                 if ( $result['timed_out'] ) {
 926                         $this->status->fatal( 'http-timed-out', $this->url );
 927                         return $this->status;
 928                 }
 929
 930                 // If everything went OK, or we received some error code
 931                 // get the response body content.
 932                 if ( $this->status->isOK()
 933                                 || (int)$this->respStatus >= 300) {
 934                         while ( !feof( $fh ) ) {
 935                                 $buf = fread( $fh, 8192 );
 936
 937                                 if ( $buf === false ) {
 938                                         $this->status->fatal( 'http-read-error' );
 939                                         break;
 940                                 }
 941
 942                                 if ( strlen( $buf ) ) {
 943                                         call_user_func( $this->callback, $fh, $buf );
 944                                 }
 945                         }
 946                 }
 947                 fclose( $fh );
 948
 949                 return $this->status;
 950         }
 951 }