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