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