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 public $httpEngine = false;
  34
  35         /**
  36          * Perform an HTTP request
  37          *
  38          * @param string $method HTTP method. Usually GET/POST
  39          * @param string $url Full URL to act on. If protocol-relative, will be expanded to an http:// URL
  40          * @param array $options Options to pass to MWHttpRequest object.
  41          *      Possible keys for the array:
  42          *    - timeout             Timeout length in seconds
  43          *    - connectTimeout      Timeout for connection, in seconds (curl only)
  44          *    - postData            An array of key-value pairs or a url-encoded form data
  45          *    - proxy               The proxy to use.
  46          *                          Otherwise it will use $wgHTTPProxy (if set)
  47          *                          Otherwise it will use the environment variable "http_proxy" (if set)
  48          *    - noProxy             Don't use any proxy at all. Takes precedence over proxy value(s).
  49          *    - sslVerifyHost       Verify hostname against certificate
  50          *    - sslVerifyCert       Verify SSL certificate
  51          *    - caInfo              Provide CA information
  52          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  53          *    - followRedirects     Whether to follow redirects (defaults to false).
  54          *                                  Note: this should only be used when the target URL is trusted,
  55          *                                  to avoid attacks on intranet services accessible by HTTP.
  56          *    - userAgent           A user agent, if you want to override the default
  57          *                          MediaWiki/$wgVersion
  58          * @return string|bool (bool)false on failure or a string on success
  59          */
  60         public static function request( $method, $url, $options = array() ) {
  61                 wfDebug( "HTTP: $method: $url\n" );
  62                 wfProfileIn( __METHOD__ . "-$method" );
  63
  64                 $options['method'] = strtoupper( $method );
  65
  66                 if ( !isset( $options['timeout'] ) ) {
  67                         $options['timeout'] = 'default';
  68                 }
  69                 if ( !isset( $options['connectTimeout'] ) ) {
  70                         $options['connectTimeout'] = 'default';
  71                 }
  72
  73                 $req = MWHttpRequest::factory( $url, $options );
  74                 $status = $req->execute();
  75
  76                 $content = false;
  77                 if ( $status->isOK() ) {
  78                         $content = $req->getContent();
  79                 }
  80                 wfProfileOut( __METHOD__ . "-$method" );
  81                 return $content;
  82         }
  83
  84         /**
  85          * Simple wrapper for Http::request( 'GET' )
  86          * @see Http::request()
  87          *
  88          * @param string $url
  89          * @param string $timeout
  90          * @param array $options
  91          * @return string
  92          */
  93         public static function get( $url, $timeout = 'default', $options = array() ) {
  94                 $options['timeout'] = $timeout;
  95                 return Http::request( 'GET', $url, $options );
  96         }
  97
  98         /**
  99          * Simple wrapper for Http::request( 'POST' )
 100          * @see Http::request()
 101          *
 102          * @param string $url
 103          * @param array $options
 104          * @return string
 105          */
 106         public static function post( $url, $options = array() ) {
 107                 return Http::request( 'POST', $url, $options );
 108         }
 109
 110         /**
 111          * Check if the URL can be served by localhost
 112          *
 113          * @param string $url Full url to check
 114          * @return bool
 115          */
 116         public static function isLocalURL( $url ) {
 117                 global $wgCommandLineMode, $wgLocalVirtualHosts, $wgConf;
 118
 119                 if ( $wgCommandLineMode ) {
 120                         return false;
 121                 }
 122
 123                 // Extract host part
 124                 $matches = array();
 125                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
 126                         $host = $matches[1];
 127                         // Split up dotwise
 128                         $domainParts = explode( '.', $host );
 129                         // Check if this domain or any superdomain is listed as a local virtual host
 130                         $domainParts = array_reverse( $domainParts );
 131
 132                         $domain = '';
 133                         $countParts = count( $domainParts );
 134                         for ( $i = 0; $i < $countParts; $i++ ) {
 135                                 $domainPart = $domainParts[$i];
 136                                 if ( $i == 0 ) {
 137                                         $domain = $domainPart;
 138                                 } else {
 139                                         $domain = $domainPart . '.' . $domain;
 140                                 }
 141
 142                                 if ( in_array( $domain, $wgLocalVirtualHosts )
 143                                         || $wgConf->isLocalVHost( $domain )
 144                                 ) {
 145                                         return true;
 146                                 }
 147                         }
 148                 }
 149
 150                 return false;
 151         }
 152
 153         /**
 154          * A standard user-agent we can use for external requests.
 155          * @return string
 156          */
 157         public static function userAgent() {
 158                 global $wgVersion;
 159                 return "MediaWiki/$wgVersion";
 160         }
 161
 162         /**
 163          * Checks that the given URI is a valid one. Hardcoding the
 164          * protocols, because we only want protocols that both cURL
 165          * and php support.
 166          *
 167          * file:// should not be allowed here for security purpose (r67684)
 168          *
 169          * @todo FIXME this is wildly inaccurate and fails to actually check most stuff
 170          *
 171          * @param string $uri URI to check for validity
 172          * @return bool
 173          */
 174         public static function isValidURI( $uri ) {
 175                 return preg_match(
 176                         '/^https?:\/\/[^\/\s]\S*$/D',
 177                         $uri
 178                 );
 179         }
 180 }
 181
 182 /**
 183  * This wrapper class will call out to curl (if available) or fallback
 184  * to regular PHP if necessary for handling internal HTTP requests.
 185  *
 186  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 187  * PHP's HTTP extension.
 188  */
 189 class MWHttpRequest {
 190         const SUPPORTS_FILE_POSTS = false;
 191
 192         protected $content;
 193         protected $timeout = 'default';
 194         protected $headersOnly = null;
 195         protected $postData = null;
 196         protected $proxy = null;
 197         protected $noProxy = false;
 198         protected $sslVerifyHost = true;
 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 string $url Url to use. If protocol-relative, will be expanded to an http:// URL
 223          * @param array $options (optional) extra params to pass (see Http::request())
 224          */
 225         protected function __construct( $url, $options = array() ) {
 226                 global $wgHTTPTimeout, $wgHTTPConnectTimeout;
 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['connectTimeout'] ) && $options['connectTimeout'] != 'default' ) {
 243                         $this->connectTimeout = $options['connectTimeout'];
 244                 } else {
 245                         $this->connectTimeout = $wgHTTPConnectTimeout;
 246                 }
 247                 if ( isset( $options['userAgent'] ) ) {
 248                         $this->setUserAgent( $options['userAgent'] );
 249                 }
 250
 251                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 252                                 "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 253
 254                 foreach ( $members as $o ) {
 255                         if ( isset( $options[$o] ) ) {
 256                                 // ensure that MWHttpRequest::method is always
 257                                 // uppercased. Bug 36137
 258                                 if ( $o == 'method' ) {
 259                                         $options[$o] = strtoupper( $options[$o] );
 260                                 }
 261                                 $this->$o = $options[$o];
 262                         }
 263                 }
 264
 265                 if ( $this->noProxy ) {
 266                         $this->proxy = ''; // noProxy takes precedence
 267                 }
 268         }
 269
 270         /**
 271          * Simple function to test if we can make any sort of requests at all, using
 272          * cURL or fopen()
 273          * @return bool
 274          */
 275         public static function canMakeRequests() {
 276                 return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
 277         }
 278
 279         /**
 280          * Generate a new request object
 281          * @param string $url Url to use
 282          * @param array $options (optional) extra params to pass (see Http::request())
 283          * @throws MWException
 284          * @return CurlHttpRequest|PhpHttpRequest
 285          * @see MWHttpRequest::__construct
 286          */
 287         public static function factory( $url, $options = null ) {
 288                 if ( !Http::$httpEngine ) {
 289                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 290                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 291                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 292                                 ' Http::$httpEngine is set to "curl"' );
 293                 }
 294
 295                 switch ( Http::$httpEngine ) {
 296                         case 'curl':
 297                                 return new CurlHttpRequest( $url, $options );
 298                         case 'php':
 299                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 300                                         throw new MWException( __METHOD__ . ': allow_url_fopen ' .
 301                                                 'needs to be enabled for pure PHP http requests to ' .
 302                                                 'work. If possible, curl should be used instead. See ' .
 303                                                 'http://php.net/curl.'
 304                                         );
 305                                 }
 306                                 return new PhpHttpRequest( $url, $options );
 307                         default:
 308                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 309                 }
 310         }
 311
 312         /**
 313          * Get the body, or content, of the response to the request
 314          *
 315          * @return string
 316          */
 317         public function getContent() {
 318                 return $this->content;
 319         }
 320
 321         /**
 322          * Set the parameters of the request
 323          *
 324          * @param array $args
 325          * @todo overload the args param
 326          */
 327         public function setData( $args ) {
 328                 $this->postData = $args;
 329         }
 330
 331         /**
 332          * Take care of setting up the proxy (do nothing if "noProxy" is set)
 333          *
 334          * @return void
 335          */
 336         public function proxySetup() {
 337                 global $wgHTTPProxy;
 338
 339                 // If there is an explicit proxy set and proxies are not disabled, then use it
 340                 if ( $this->proxy && !$this->noProxy ) {
 341                         return;
 342                 }
 343
 344                 // Otherwise, fallback to $wgHTTPProxy/http_proxy (when set) if this is not a machine
 345                 // local URL and proxies are not disabled
 346                 if ( Http::isLocalURL( $this->url ) || $this->noProxy ) {
 347                         $this->proxy = '';
 348                 } elseif ( $wgHTTPProxy ) {
 349                         $this->proxy = $wgHTTPProxy;
 350                 } elseif ( getenv( "http_proxy" ) ) {
 351                         $this->proxy = getenv( "http_proxy" );
 352                 }
 353         }
 354
 355         /**
 356          * Set the user agent
 357          * @param string $UA
 358          */
 359         public function setUserAgent( $UA ) {
 360                 $this->setHeader( 'User-Agent', $UA );
 361         }
 362
 363         /**
 364          * Set an arbitrary header
 365          * @param string $name
 366          * @param string $value
 367          */
 368         public function setHeader( $name, $value ) {
 369                 // I feel like I should normalize the case here...
 370                 $this->reqHeaders[$name] = $value;
 371         }
 372
 373         /**
 374          * Get an array of the headers
 375          * @return array
 376          */
 377         public function getHeaderList() {
 378                 $list = array();
 379
 380                 if ( $this->cookieJar ) {
 381                         $this->reqHeaders['Cookie'] =
 382                                 $this->cookieJar->serializeToHttpRequest(
 383                                         $this->parsedUrl['path'],
 384                                         $this->parsedUrl['host']
 385                                 );
 386                 }
 387
 388                 foreach ( $this->reqHeaders as $name => $value ) {
 389                         $list[] = "$name: $value";
 390                 }
 391
 392                 return $list;
 393         }
 394
 395         /**
 396          * Set a read callback to accept data read from the HTTP request.
 397          * By default, data is appended to an internal buffer which can be
 398          * retrieved through $req->getContent().
 399          *
 400          * To handle data as it comes in -- especially for large files that
 401          * would not fit in memory -- you can instead set your own callback,
 402          * in the form function($resource, $buffer) where the first parameter
 403          * is the low-level resource being read (implementation specific),
 404          * and the second parameter is the data buffer.
 405          *
 406          * You MUST return the number of bytes handled in the buffer; if fewer
 407          * bytes are reported handled than were passed to you, the HTTP fetch
 408          * will be aborted.
 409          *
 410          * @param callable $callback
 411          * @throws MWException
 412          */
 413         public function setCallback( $callback ) {
 414                 if ( !is_callable( $callback ) ) {
 415                         throw new MWException( 'Invalid MwHttpRequest callback' );
 416                 }
 417                 $this->callback = $callback;
 418         }
 419
 420         /**
 421          * A generic callback to read the body of the response from a remote
 422          * server.
 423          *
 424          * @param resource $fh
 425          * @param string $content
 426          * @return int
 427          */
 428         public function read( $fh, $content ) {
 429                 $this->content .= $content;
 430                 return strlen( $content );
 431         }
 432
 433         /**
 434          * Take care of whatever is necessary to perform the URI request.
 435          *
 436          * @return Status
 437          */
 438         public function execute() {
 439
 440                 $this->content = "";
 441
 442                 if ( strtoupper( $this->method ) == "HEAD" ) {
 443                         $this->headersOnly = true;
 444                 }
 445
 446                 $this->proxySetup(); // set up any proxy as needed
 447
 448                 if ( !$this->callback ) {
 449                         $this->setCallback( array( $this, 'read' ) );
 450                 }
 451
 452                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 453                         $this->setUserAgent( Http::userAgent() );
 454                 }
 455
 456         }
 457
 458         /**
 459          * Parses the headers, including the HTTP status code and any
 460          * Set-Cookie headers.  This function expects the headers to be
 461          * found in an array in the member variable headerList.
 462          */
 463         protected function parseHeader() {
 464
 465                 $lastname = "";
 466
 467                 foreach ( $this->headerList as $header ) {
 468                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 469                                 $this->respVersion = $match[1];
 470                                 $this->respStatus = $match[2];
 471                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 472                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 473                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 474                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 475                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 476                                 $lastname = strtolower( $match[1] );
 477                         }
 478                 }
 479
 480                 $this->parseCookies();
 481
 482         }
 483
 484         /**
 485          * Sets HTTPRequest status member to a fatal value with the error
 486          * message if the returned integer value of the status code was
 487          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 488          * RFC2616, section 10,
 489          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 490          * list of status codes.)
 491          */
 492         protected function setStatus() {
 493                 if ( !$this->respHeaders ) {
 494                         $this->parseHeader();
 495                 }
 496
 497                 if ( (int)$this->respStatus > 399 ) {
 498                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 499                         $this->status->fatal( "http-bad-status", $code, $message );
 500                 }
 501         }
 502
 503         /**
 504          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 505          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 506          * for a list of status codes.)
 507          *
 508          * @return int
 509          */
 510         public function getStatus() {
 511                 if ( !$this->respHeaders ) {
 512                         $this->parseHeader();
 513                 }
 514
 515                 return (int)$this->respStatus;
 516         }
 517
 518         /**
 519          * Returns true if the last status code was a redirect.
 520          *
 521          * @return bool
 522          */
 523         public function isRedirect() {
 524                 if ( !$this->respHeaders ) {
 525                         $this->parseHeader();
 526                 }
 527
 528                 $status = (int)$this->respStatus;
 529
 530                 if ( $status >= 300 && $status <= 303 ) {
 531                         return true;
 532                 }
 533
 534                 return false;
 535         }
 536
 537         /**
 538          * Returns an associative array of response headers after the
 539          * request has been executed.  Because some headers
 540          * (e.g. Set-Cookie) can appear more than once the, each value of
 541          * the associative array is an array of the values given.
 542          *
 543          * @return array
 544          */
 545         public function getResponseHeaders() {
 546                 if ( !$this->respHeaders ) {
 547                         $this->parseHeader();
 548                 }
 549
 550                 return $this->respHeaders;
 551         }
 552
 553         /**
 554          * Returns the value of the given response header.
 555          *
 556          * @param string $header
 557          * @return string
 558          */
 559         public function getResponseHeader( $header ) {
 560                 if ( !$this->respHeaders ) {
 561                         $this->parseHeader();
 562                 }
 563
 564                 if ( isset( $this->respHeaders[strtolower( $header )] ) ) {
 565                         $v = $this->respHeaders[strtolower( $header )];
 566                         return $v[count( $v ) - 1];
 567                 }
 568
 569                 return null;
 570         }
 571
 572         /**
 573          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 574          *
 575          * @param CookieJar $jar
 576          */
 577         public function setCookieJar( $jar ) {
 578                 $this->cookieJar = $jar;
 579         }
 580
 581         /**
 582          * Returns the cookie jar in use.
 583          *
 584          * @return CookieJar
 585          */
 586         public function getCookieJar() {
 587                 if ( !$this->respHeaders ) {
 588                         $this->parseHeader();
 589                 }
 590
 591                 return $this->cookieJar;
 592         }
 593
 594         /**
 595          * Sets a cookie. Used before a request to set up any individual
 596          * cookies. Used internally after a request to parse the
 597          * Set-Cookie headers.
 598          * @see Cookie::set
 599          * @param string $name
 600          * @param mixed $value
 601          * @param array $attr
 602          */
 603         public function setCookie( $name, $value = null, $attr = null ) {
 604                 if ( !$this->cookieJar ) {
 605                         $this->cookieJar = new CookieJar;
 606                 }
 607
 608                 $this->cookieJar->setCookie( $name, $value, $attr );
 609         }
 610
 611         /**
 612          * Parse the cookies in the response headers and store them in the cookie jar.
 613          */
 614         protected function parseCookies() {
 615
 616                 if ( !$this->cookieJar ) {
 617                         $this->cookieJar = new CookieJar;
 618                 }
 619
 620                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 621                         $url = parse_url( $this->getFinalUrl() );
 622                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 623                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 624                         }
 625                 }
 626
 627         }
 628
 629         /**
 630          * Returns the final URL after all redirections.
 631          *
 632          * Relative values of the "Location" header are incorrect as
 633          * stated in RFC, however they do happen and modern browsers
 634          * support them.  This function loops backwards through all
 635          * locations in order to build the proper absolute URI - Marooned
 636          * at wikia-inc.com
 637          *
 638          * Note that the multiple Location: headers are an artifact of
 639          * CURL -- they shouldn't actually get returned this way. Rewrite
 640          * this when bug 29232 is taken care of (high-level redirect
 641          * handling rewrite).
 642          *
 643          * @return string
 644          */
 645         public function getFinalUrl() {
 646                 $headers = $this->getResponseHeaders();
 647
 648                 //return full url (fix for incorrect but handled relative location)
 649                 if ( isset( $headers['location'] ) ) {
 650                         $locations = $headers['location'];
 651                         $domain = '';
 652                         $foundRelativeURI = false;
 653                         $countLocations = count( $locations );
 654
 655                         for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
 656                                 $url = parse_url( $locations[$i] );
 657
 658                                 if ( isset( $url['host'] ) ) {
 659                                         $domain = $url['scheme'] . '://' . $url['host'];
 660                                         break; //found correct URI (with host)
 661                                 } else {
 662                                         $foundRelativeURI = true;
 663                                 }
 664                         }
 665
 666                         if ( $foundRelativeURI ) {
 667                                 if ( $domain ) {
 668                                         return $domain . $locations[$countLocations - 1];
 669                                 } else {
 670                                         $url = parse_url( $this->url );
 671                                         if ( isset( $url['host'] ) ) {
 672                                                 return $url['scheme'] . '://' . $url['host'] .
 673                                                         $locations[$countLocations - 1];
 674                                         }
 675                                 }
 676                         } else {
 677                                 return $locations[$countLocations - 1];
 678                         }
 679                 }
 680
 681                 return $this->url;
 682         }
 683
 684         /**
 685          * Returns true if the backend can follow redirects. Overridden by the
 686          * child classes.
 687          * @return bool
 688          */
 689         public function canFollowRedirects() {
 690                 return true;
 691         }
 692 }
 693
 694 /**
 695  * MWHttpRequest implemented using internal curl compiled into PHP
 696  */
 697 class CurlHttpRequest extends MWHttpRequest {
 698         const SUPPORTS_FILE_POSTS = true;
 699
 700         protected $curlOptions = array();
 701         protected $headerText = "";
 702
 703         /**
 704          * @param resource $fh
 705          * @param string $content
 706          * @return int
 707          */
 708         protected function readHeader( $fh, $content ) {
 709                 $this->headerText .= $content;
 710                 return strlen( $content );
 711         }
 712
 713         public function execute() {
 714
 715                 parent::execute();
 716
 717                 if ( !$this->status->isOK() ) {
 718                         return $this->status;
 719                 }
 720
 721                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 722                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 723
 724                 // Only supported in curl >= 7.16.2
 725                 if ( defined( 'CURLOPT_CONNECTTIMEOUT_MS' ) ) {
 726                         $this->curlOptions[CURLOPT_CONNECTTIMEOUT_MS] = $this->connectTimeout * 1000;
 727                 }
 728
 729                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 730                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 731                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 732                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 733                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 734
 735                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 736
 737                 $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost ? 2 : 0;
 738                 $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 739
 740                 if ( $this->caInfo ) {
 741                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 742                 }
 743
 744                 if ( $this->headersOnly ) {
 745                         $this->curlOptions[CURLOPT_NOBODY] = true;
 746                         $this->curlOptions[CURLOPT_HEADER] = true;
 747                 } elseif ( $this->method == 'POST' ) {
 748                         $this->curlOptions[CURLOPT_POST] = true;
 749                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 750                         // Suppress 'Expect: 100-continue' header, as some servers
 751                         // will reject it with a 417 and Curl won't auto retry
 752                         // with HTTP 1.0 fallback
 753                         $this->reqHeaders['Expect'] = '';
 754                 } else {
 755                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 756                 }
 757
 758                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 759
 760                 $curlHandle = curl_init( $this->url );
 761
 762                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 763                         throw new MWException( "Error setting curl options." );
 764                 }
 765
 766                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 767                         wfSuppressWarnings();
 768                         if ( !curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 769                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 770                                         "Probably safe_mode or open_basedir is set.\n" );
 771                                 // Continue the processing. If it were in curl_setopt_array,
 772                                 // processing would have halted on its entry
 773                         }
 774                         wfRestoreWarnings();
 775                 }
 776
 777                 $curlRes = curl_exec( $curlHandle );
 778                 if ( curl_errno( $curlHandle ) == CURLE_OPERATION_TIMEOUTED ) {
 779                         $this->status->fatal( 'http-timed-out', $this->url );
 780                 } elseif ( $curlRes === false ) {
 781                         $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 782                 } else {
 783                         $this->headerList = explode( "\r\n", $this->headerText );
 784                 }
 785
 786                 curl_close( $curlHandle );
 787
 788                 $this->parseHeader();
 789                 $this->setStatus();
 790
 791
 792                 return $this->status;
 793         }
 794
 795         /**
 796          * @return bool
 797          */
 798         public function canFollowRedirects() {
 799                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 800                         wfDebug( "Cannot follow redirects in safe mode\n" );
 801                         return false;
 802                 }
 803
 804                 $curlVersionInfo = curl_version();
 805                 if ( $curlVersionInfo['version_number'] < 0x071304 ) {
 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 string $url
 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
 828                 parent::execute();
 829
 830                 if ( is_array( $this->postData ) ) {
 831                         $this->postData = wfArrayToCgi( $this->postData );
 832                 }
 833
 834                 if ( $this->parsedUrl['scheme'] != 'http'
 835                         && $this->parsedUrl['scheme'] != 'https' ) {
 836                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 837                 }
 838
 839                 $this->reqHeaders['Accept'] = "*/*";
 840                 $this->reqHeaders['Connection'] = 'Close';
 841                 if ( $this->method == 'POST' ) {
 842                         // Required for HTTP 1.0 POSTs
 843                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 844                         if ( !isset( $this->reqHeaders['Content-Type'] ) ) {
 845                                 $this->reqHeaders['Content-Type'] = "application/x-www-form-urlencoded";
 846                         }
 847                 }
 848
 849                 // Set up PHP stream context
 850                 $options = array(
 851                         'http' => array(
 852                                 'method' => $this->method,
 853                                 'header' => implode( "\r\n", $this->getHeaderList() ),
 854                                 'protocol_version' => '1.1',
 855                                 'max_redirects' => $this->followRedirects ? $this->maxRedirects : 0,
 856                                 'ignore_errors' => true,
 857                                 'timeout' => $this->timeout,
 858                                 // Curl options in case curlwrappers are installed
 859                                 'curl_verify_ssl_host' => $this->sslVerifyHost ? 2 : 0,
 860                                 'curl_verify_ssl_peer' => $this->sslVerifyCert,
 861                         ),
 862                         'ssl' => array(
 863                                 'verify_peer' => $this->sslVerifyCert,
 864                                 'SNI_enabled' => true,
 865                         ),
 866                 );
 867
 868                 if ( $this->proxy ) {
 869                         $options['http']['proxy'] = $this->urlToTCP( $this->proxy );
 870                         $options['http']['request_fulluri'] = true;
 871                 }
 872
 873                 if ( $this->postData ) {
 874                         $options['http']['content'] = $this->postData;
 875                 }
 876
 877                 if ( $this->sslVerifyHost ) {
 878                         $options['ssl']['CN_match'] = $this->parsedUrl['host'];
 879                 }
 880
 881                 if ( is_dir( $this->caInfo ) ) {
 882                         $options['ssl']['capath'] = $this->caInfo;
 883                 } elseif ( is_file( $this->caInfo ) ) {
 884                         $options['ssl']['cafile'] = $this->caInfo;
 885                 } elseif ( $this->caInfo ) {
 886                         throw new MWException( "Invalid CA info passed: {$this->caInfo}" );
 887                 }
 888
 889                 $context = stream_context_create( $options );
 890
 891                 $this->headerList = array();
 892                 $reqCount = 0;
 893                 $url = $this->url;
 894
 895                 $result = array();
 896
 897                 do {
 898                         $reqCount++;
 899                         wfSuppressWarnings();
 900                         $fh = fopen( $url, "r", false, $context );
 901                         wfRestoreWarnings();
 902
 903                         if ( !$fh ) {
 904                                 break;
 905                         }
 906
 907                         $result = stream_get_meta_data( $fh );
 908                         $this->headerList = $result['wrapper_data'];
 909                         $this->parseHeader();
 910
 911                         if ( !$this->followRedirects ) {
 912                                 break;
 913                         }
 914
 915                         # Handle manual redirection
 916                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 917                                 break;
 918                         }
 919                         # Check security of URL
 920                         $url = $this->getResponseHeader( "Location" );
 921
 922                         if ( !Http::isValidURI( $url ) ) {
 923                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 924                                 break;
 925                         }
 926                 } while ( true );
 927
 928                 $this->setStatus();
 929
 930                 if ( $fh === false ) {
 931                         $this->status->fatal( 'http-request-error' );
 932                         return $this->status;
 933                 }
 934
 935                 if ( $result['timed_out'] ) {
 936                         $this->status->fatal( 'http-timed-out', $this->url );
 937                         return $this->status;
 938                 }
 939
 940                 // If everything went OK, or we received some error code
 941                 // get the response body content.
 942                 if ( $this->status->isOK() || (int)$this->respStatus >= 300 ) {
 943                         while ( !feof( $fh ) ) {
 944                                 $buf = fread( $fh, 8192 );
 945
 946                                 if ( $buf === false ) {
 947                                         $this->status->fatal( 'http-read-error' );
 948                                         break;
 949                                 }
 950
 951                                 if ( strlen( $buf ) ) {
 952                                         call_user_func( $this->callback, $fh, $buf );
 953                                 }
 954                         }
 955                 }
 956                 fclose( $fh );
 957
 958
 959                 return $this->status;
 960         }
 961 }