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