includes/HttpFunctions.php

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