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
  18          * @param $options Array: options to pass to HttpRequest 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                 $url = wfExpandUrl( $url );
  36                 wfDebug( "HTTP: $method: $url\n" );
  37                 $options['method'] = strtoupper( $method );
  38
  39                 if ( !isset( $options['timeout'] ) ) {
  40                         $options['timeout'] = 'default';
  41                 }
  42
  43                 $req = HttpRequest::factory( $url, $options );
  44                 $status = $req->execute();
  45
  46                 if ( $status->isOK() ) {
  47                         return $req->getContent();
  48                 } else {
  49                         return false;
  50                 }
  51         }
  52
  53         /**
  54          * Simple wrapper for Http::request( 'GET' )
  55          * @see Http::request()
  56          */
  57         public static function get( $url, $timeout = 'default', $options = array() ) {
  58                 $options['timeout'] = $timeout;
  59                 return Http::request( 'GET', $url, $options );
  60         }
  61
  62         /**
  63          * Simple wrapper for Http::request( 'POST' )
  64          * @see Http::request()
  65          */
  66         public static function post( $url, $options = array() ) {
  67                 return Http::request( 'POST', $url, $options );
  68         }
  69
  70         /**
  71          * Check if the URL can be served by localhost
  72          *
  73          * @param $url String: full url to check
  74          * @return Boolean
  75          */
  76         public static function isLocalURL( $url ) {
  77                 global $wgCommandLineMode, $wgConf;
  78
  79                 if ( $wgCommandLineMode ) {
  80                         return false;
  81                 }
  82
  83                 // Extract host part
  84                 $matches = array();
  85                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
  86                         $host = $matches[1];
  87                         // Split up dotwise
  88                         $domainParts = explode( '.', $host );
  89                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
  90                         $domainParts = array_reverse( $domainParts );
  91
  92                         for ( $i = 0; $i < count( $domainParts ); $i++ ) {
  93                                 $domainPart = $domainParts[$i];
  94                                 if ( $i == 0 ) {
  95                                         $domain = $domainPart;
  96                                 } else {
  97                                         $domain = $domainPart . '.' . $domain;
  98                                 }
  99
 100                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 101                                         return true;
 102                                 }
 103                         }
 104                 }
 105
 106                 return false;
 107         }
 108
 109         /**
 110          * A standard user-agent we can use for external requests.
 111          * @return String
 112          */
 113         public static function userAgent() {
 114                 global $wgVersion;
 115                 return "MediaWiki/$wgVersion";
 116         }
 117
 118         /**
 119          * Checks that the given URI is a valid one
 120          *
 121          * @param $uri Mixed: URI to check for validity
 122          * @returns Boolean
 123          */
 124         public static function isValidURI( $uri ) {
 125                 return preg_match(
 126                         '/(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/',
 127                         $uri,
 128                         $matches
 129                 );
 130         }
 131 }
 132
 133 /**
 134  * This wrapper class will call out to curl (if available) or fallback
 135  * to regular PHP if necessary for handling internal HTTP requests.
 136  */
 137 class HttpRequest {
 138         protected $content;
 139         protected $timeout = 'default';
 140         protected $headersOnly = null;
 141         protected $postData = null;
 142         protected $proxy = null;
 143         protected $noProxy = false;
 144         protected $sslVerifyHost = true;
 145         protected $sslVerifyCert = true;
 146         protected $caInfo = null;
 147         protected $method = "GET";
 148         protected $reqHeaders = array();
 149         protected $url;
 150         protected $parsedUrl;
 151         protected $callback;
 152         protected $maxRedirects = 5;
 153         protected $followRedirects = false;
 154
 155         protected $cookieJar;
 156
 157         protected $headerList = array();
 158         protected $respVersion = "0.9";
 159         protected $respStatus = "200 Ok";
 160         protected $respHeaders = array();
 161
 162         public $status;
 163
 164         /**
 165          * @param $url String: url to use
 166          * @param $options Array: (optional) extra params to pass (see Http::request())
 167          */
 168         function __construct( $url, $options = array() ) {
 169                 global $wgHTTPTimeout;
 170
 171                 $this->url = $url;
 172                 $this->parsedUrl = parse_url( $url );
 173
 174                 if ( !Http::isValidURI( $this->url ) ) {
 175                         $this->status = Status::newFatal( 'http-invalid-url' );
 176                 } else {
 177                         $this->status = Status::newGood( 100 ); // continue
 178                 }
 179
 180                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 181                         $this->timeout = $options['timeout'];
 182                 } else {
 183                         $this->timeout = $wgHTTPTimeout;
 184                 }
 185
 186                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 187                                   "method", "followRedirects", "maxRedirects", "sslVerifyCert" );
 188
 189                 foreach ( $members as $o ) {
 190                         if ( isset( $options[$o] ) ) {
 191                                 $this->$o = $options[$o];
 192                         }
 193                 }
 194         }
 195
 196         /**
 197          * Generate a new request object
 198          * @see HttpRequest::__construct
 199          */
 200         public static function factory( $url, $options = null ) {
 201                 if ( !Http::$httpEngine ) {
 202                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 203                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 204                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 205                                                                    ' Http::$httpEngine is set to "curl"' );
 206                 }
 207
 208                 switch( Http::$httpEngine ) {
 209                         case 'curl':
 210                                 return new CurlHttpRequest( $url, $options );
 211                         case 'php':
 212                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 213                                         throw new MWException( __METHOD__ . ': allow_url_fopen needs to be enabled for pure PHP' .
 214                                                 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
 215                                 }
 216                                 return new PhpHttpRequest( $url, $options );
 217                         default:
 218                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 219                 }
 220         }
 221
 222         /**
 223          * Get the body, or content, of the response to the request
 224          *
 225          * @return String
 226          */
 227         public function getContent() {
 228                 return $this->content;
 229         }
 230
 231         /**
 232          * Set the parameters of the request
 233
 234          * @param $args Array
 235          * @todo overload the args param
 236          */
 237         public function setData( $args ) {
 238                 $this->postData = $args;
 239         }
 240
 241         /**
 242          * Take care of setting up the proxy
 243          * (override in subclass)
 244          *
 245          * @return String
 246          */
 247         public function proxySetup() {
 248                 global $wgHTTPProxy;
 249
 250                 if ( $this->proxy ) {
 251                         return;
 252                 }
 253
 254                 if ( Http::isLocalURL( $this->url ) ) {
 255                         $this->proxy = 'http://localhost:80/';
 256                 } elseif ( $wgHTTPProxy ) {
 257                         $this->proxy = $wgHTTPProxy ;
 258                 } elseif ( getenv( "http_proxy" ) ) {
 259                         $this->proxy = getenv( "http_proxy" );
 260                 }
 261         }
 262
 263         /**
 264          * Set the refererer header
 265          */
 266         public function setReferer( $url ) {
 267                 $this->setHeader( 'Referer', $url );
 268         }
 269
 270         /**
 271          * Set the user agent
 272          */
 273         public function setUserAgent( $UA ) {
 274                 $this->setHeader( 'User-Agent', $UA );
 275         }
 276
 277         /**
 278          * Set an arbitrary header
 279          */
 280         public function setHeader( $name, $value ) {
 281                 // I feel like I should normalize the case here...
 282                 $this->reqHeaders[$name] = $value;
 283         }
 284
 285         /**
 286          * Get an array of the headers
 287          */
 288         public function getHeaderList() {
 289                 $list = array();
 290
 291                 if ( $this->cookieJar ) {
 292                         $this->reqHeaders['Cookie'] =
 293                                 $this->cookieJar->serializeToHttpRequest(
 294                                         $this->parsedUrl['path'],
 295                                         $this->parsedUrl['host']
 296                                 );
 297                 }
 298
 299                 foreach ( $this->reqHeaders as $name => $value ) {
 300                         $list[] = "$name: $value";
 301                 }
 302
 303                 return $list;
 304         }
 305
 306         /**
 307          * Set the callback
 308          *
 309          * @param $callback Callback
 310          */
 311         public function setCallback( $callback ) {
 312                 $this->callback = $callback;
 313         }
 314
 315         /**
 316          * A generic callback to read the body of the response from a remote
 317          * server.
 318          *
 319          * @param $fh handle
 320          * @param $content String
 321          */
 322         public function read( $fh, $content ) {
 323                 $this->content .= $content;
 324                 return strlen( $content );
 325         }
 326
 327         /**
 328          * Take care of whatever is necessary to perform the URI request.
 329          *
 330          * @return Status
 331          */
 332         public function execute() {
 333                 global $wgTitle;
 334
 335                 $this->content = "";
 336
 337                 if ( strtoupper( $this->method ) == "HEAD" ) {
 338                         $this->headersOnly = true;
 339                 }
 340
 341                 if ( is_array( $this->postData ) ) {
 342                         $this->postData = wfArrayToCGI( $this->postData );
 343                 }
 344
 345                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 346                         $this->setReferer( $wgTitle->getFullURL() );
 347                 }
 348
 349                 if ( !$this->noProxy ) {
 350                         $this->proxySetup();
 351                 }
 352
 353                 if ( !$this->callback ) {
 354                         $this->setCallback( array( $this, 'read' ) );
 355                 }
 356
 357                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 358                         $this->setUserAgent( Http::userAgent() );
 359                 }
 360         }
 361
 362         /**
 363          * Parses the headers, including the HTTP status code and any
 364          * Set-Cookie headers.  This function expectes the headers to be
 365          * found in an array in the member variable headerList.
 366          *
 367          * @return nothing
 368          */
 369         protected function parseHeader() {
 370                 $lastname = "";
 371
 372                 foreach ( $this->headerList as $header ) {
 373                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 374                                 $this->respVersion = $match[1];
 375                                 $this->respStatus = $match[2];
 376                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 377                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 378                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 379                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 380                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 381                                 $lastname = strtolower( $match[1] );
 382                         }
 383                 }
 384
 385                 $this->parseCookies();
 386         }
 387
 388         /**
 389          * Sets the member variable status to a fatal status if the HTTP
 390          * status code was not 200.
 391          *
 392          * @return nothing
 393          */
 394         protected function setStatus() {
 395                 if ( !$this->respHeaders ) {
 396                         $this->parseHeader();
 397                 }
 398
 399                 if ( (int)$this->respStatus !== 200 ) {
 400                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 401                         $this->status->fatal( "http-bad-status", $code, $message );
 402                 }
 403         }
 404
 405
 406         /**
 407          * Returns true if the last status code was a redirect.
 408          *
 409          * @return Boolean
 410          */
 411         public function isRedirect() {
 412                 if ( !$this->respHeaders ) {
 413                         $this->parseHeader();
 414                 }
 415
 416                 $status = (int)$this->respStatus;
 417
 418                 if ( $status >= 300 && $status <= 303 ) {
 419                         return true;
 420                 }
 421
 422                 return false;
 423         }
 424
 425         /**
 426          * Returns an associative array of response headers after the
 427          * request has been executed.  Because some headers
 428          * (e.g. Set-Cookie) can appear more than once the, each value of
 429          * the associative array is an array of the values given.
 430          *
 431          * @return Array
 432          */
 433         public function getResponseHeaders() {
 434                 if ( !$this->respHeaders ) {
 435                         $this->parseHeader();
 436                 }
 437
 438                 return $this->respHeaders;
 439         }
 440
 441         /**
 442          * Returns the value of the given response header.
 443          *
 444          * @param $header String
 445          * @return String
 446          */
 447         public function getResponseHeader( $header ) {
 448                 if ( !$this->respHeaders ) {
 449                         $this->parseHeader();
 450                 }
 451
 452                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 453                         $v = $this->respHeaders[strtolower ( $header ) ];
 454                         return $v[count( $v ) - 1];
 455                 }
 456
 457                 return null;
 458         }
 459
 460         /**
 461          * Tells the HttpRequest object to use this pre-loaded CookieJar.
 462          *
 463          * @param $jar CookieJar
 464          */
 465         public function setCookieJar( $jar ) {
 466                 $this->cookieJar = $jar;
 467         }
 468
 469         /**
 470          * Returns the cookie jar in use.
 471          *
 472          * @returns CookieJar
 473          */
 474         public function getCookieJar() {
 475                 if ( !$this->respHeaders ) {
 476                         $this->parseHeader();
 477                 }
 478
 479                 return $this->cookieJar;
 480         }
 481
 482         /**
 483          * Sets a cookie.  Used before a request to set up any individual
 484          * cookies.      Used internally after a request to parse the
 485          * Set-Cookie headers.
 486          * @see Cookie::set
 487          */
 488         public function setCookie( $name, $value = null, $attr = null ) {
 489                 if ( !$this->cookieJar ) {
 490                         $this->cookieJar = new CookieJar;
 491                 }
 492
 493                 $this->cookieJar->setCookie( $name, $value, $attr );
 494         }
 495
 496         /**
 497          * Parse the cookies in the response headers and store them in the cookie jar.
 498          */
 499         protected function parseCookies() {
 500                 if ( !$this->cookieJar ) {
 501                         $this->cookieJar = new CookieJar;
 502                 }
 503
 504                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 505                         $url = parse_url( $this->getFinalUrl() );
 506                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 507                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 508                         }
 509                 }
 510         }
 511
 512         /**
 513          * Returns the final URL after all redirections.
 514          *
 515          * @return String
 516          */
 517         public function getFinalUrl() {
 518                 $location = $this->getResponseHeader( "Location" );
 519
 520                 if ( $location ) {
 521                         return $location;
 522                 }
 523
 524                 return $this->url;
 525         }
 526
 527         /**
 528          * Returns true if the backend can follow redirects. Overridden by the
 529          * child classes.
 530          */
 531         public function canFollowRedirects() {
 532                 return true;
 533         }
 534 }
 535
 536
 537 class Cookie {
 538         protected $name;
 539         protected $value;
 540         protected $expires;
 541         protected $path;
 542         protected $domain;
 543         protected $isSessionKey = true;
 544         // TO IMPLEMENT  protected $secure
 545         // TO IMPLEMENT? protected $maxAge (add onto expires)
 546         // TO IMPLEMENT? protected $version
 547         // TO IMPLEMENT? protected $comment
 548
 549         function __construct( $name, $value, $attr ) {
 550                 $this->name = $name;
 551                 $this->set( $value, $attr );
 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          *
 559          * @param $value String: the value of the cookie
 560          * @param $attr Array: possible key/values:
 561          *              expires  A date string
 562          *              path     The path this cookie is used on
 563          *              domain   Domain this cookie is used on
 564          */
 565         public function set( $value, $attr ) {
 566                 $this->value = $value;
 567
 568                 if ( isset( $attr['expires'] ) ) {
 569                         $this->isSessionKey = false;
 570                         $this->expires = strtotime( $attr['expires'] );
 571                 }
 572
 573                 if ( isset( $attr['path'] ) ) {
 574                         $this->path = $attr['path'];
 575                 } else {
 576                         $this->path = "/";
 577                 }
 578
 579                 if ( isset( $attr['domain'] ) ) {
 580                         if ( self::validateCookieDomain( $attr['domain'] ) ) {
 581                                 $this->domain = $attr['domain'];
 582                         }
 583                 } else {
 584                         throw new MWException( "You must specify a domain." );
 585                 }
 586         }
 587
 588         /**
 589          * Return the true if the cookie is valid is valid.  Otherwise,
 590          * false.  The uses a method similar to IE cookie security
 591          * described here:
 592          * http://kuza55.blogspot.com/2008/02/understanding-cookie-security.html
 593          * A better method might be to use a blacklist like
 594          * http://publicsuffix.org/
 595          *
 596          * @param $domain String: the domain to validate
 597          * @param $originDomain String: (optional) the domain the cookie originates from
 598          * @return Boolean
 599          */
 600         public static function validateCookieDomain( $domain, $originDomain = null ) {
 601                 // Don't allow a trailing dot
 602                 if ( substr( $domain, -1 ) == "." ) {
 603                         return false;
 604                 }
 605
 606                 $dc = explode( ".", $domain );
 607
 608                 // Only allow full, valid IP addresses
 609                 if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
 610                         if ( count( $dc ) != 4 ) {
 611                                 return false;
 612                         }
 613
 614                         if ( ip2long( $domain ) === false ) {
 615                                 return false;
 616                         }
 617
 618                         if ( $originDomain == null || $originDomain == $domain ) {
 619                                 return true;
 620                         }
 621
 622                 }
 623
 624                 // Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
 625                 if ( strrpos( $domain, "." ) - strlen( $domain )  == -3 ) {
 626                         if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
 627                                 || ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
 628                                 return false;
 629                         }
 630                         if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == "" ) )
 631                                 && preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
 632                                 return false;
 633                         }
 634                 }
 635
 636                 if ( $originDomain != null ) {
 637                         if ( substr( $domain, 0, 1 ) != "." && $domain != $originDomain ) {
 638                                 return false;
 639                         }
 640
 641                         if ( substr( $domain, 0, 1 ) == "."
 642                                 && substr_compare( $originDomain, $domain, -strlen( $domain ),
 643                                                                    strlen( $domain ), TRUE ) != 0 ) {
 644                                 return false;
 645                         }
 646                 }
 647
 648                 return true;
 649         }
 650
 651         /**
 652          * Serialize the cookie jar into a format useful for HTTP Request headers.
 653          *
 654          * @param $path String: the path that will be used. Required.
 655          * @param $domain String: the domain that will be used. Required.
 656          * @return String
 657          */
 658         public function serializeToHttpRequest( $path, $domain ) {
 659                 $ret = "";
 660
 661                 if ( $this->canServeDomain( $domain )
 662                                 && $this->canServePath( $path )
 663                                 && $this->isUnExpired() ) {
 664                         $ret = $this->name . "=" . $this->value;
 665                 }
 666
 667                 return $ret;
 668         }
 669
 670         protected function canServeDomain( $domain ) {
 671                 if ( $domain == $this->domain
 672                         || ( strlen( $domain ) > strlen( $this->domain )
 673                                  && substr( $this->domain, 0, 1 ) == "."
 674                                  && substr_compare( $domain, $this->domain, -strlen( $this->domain ),
 675                                                                         strlen( $this->domain ), TRUE ) == 0 ) ) {
 676                         return true;
 677                 }
 678
 679                 return false;
 680         }
 681
 682         protected function canServePath( $path ) {
 683                 if ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 ) {
 684                         return true;
 685                 }
 686
 687                 return false;
 688         }
 689
 690         protected function isUnExpired() {
 691                 if ( $this->isSessionKey || $this->expires > time() ) {
 692                         return true;
 693                 }
 694
 695                 return false;
 696         }
 697 }
 698
 699 class CookieJar {
 700         private $cookie = array();
 701
 702         /**
 703          * Set a cookie in the cookie jar.      Make sure only one cookie per-name exists.
 704          * @see Cookie::set()
 705          */
 706         public function setCookie ( $name, $value, $attr ) {
 707                 /* cookies: case insensitive, so this should work.
 708                  * We'll still send the cookies back in the same case we got them, though.
 709                  */
 710                 $index = strtoupper( $name );
 711
 712                 if ( isset( $this->cookie[$index] ) ) {
 713                         $this->cookie[$index]->set( $value, $attr );
 714                 } else {
 715                         $this->cookie[$index] = new Cookie( $name, $value, $attr );
 716                 }
 717         }
 718
 719         /**
 720          * @see Cookie::serializeToHttpRequest
 721          */
 722         public function serializeToHttpRequest( $path, $domain ) {
 723                 $cookies = array();
 724
 725                 foreach ( $this->cookie as $c ) {
 726                         $serialized = $c->serializeToHttpRequest( $path, $domain );
 727
 728                         if ( $serialized ) {
 729                                 $cookies[] = $serialized;
 730                         }
 731                 }
 732
 733                 return implode( "; ", $cookies );
 734         }
 735
 736         /**
 737          * Parse the content of an Set-Cookie HTTP Response header.
 738          *
 739          * @param $cookie String
 740          * @param $domain String: cookie's domain
 741          */
 742         public function parseCookieResponseHeader ( $cookie, $domain ) {
 743                 $len = strlen( "Set-Cookie:" );
 744
 745                 if ( substr_compare( "Set-Cookie:", $cookie, 0, $len, TRUE ) === 0 ) {
 746                         $cookie = substr( $cookie, $len );
 747                 }
 748
 749                 $bit = array_map( 'trim', explode( ";", $cookie ) );
 750
 751                 if ( count( $bit ) >= 1 ) {
 752                         list( $name, $value ) = explode( "=", array_shift( $bit ), 2 );
 753                         $attr = array();
 754
 755                         foreach ( $bit as $piece ) {
 756                                 $parts = explode( "=", $piece );
 757                                 if ( count( $parts ) > 1 ) {
 758                                         $attr[strtolower( $parts[0] )] = $parts[1];
 759                                 } else {
 760                                         $attr[strtolower( $parts[0] )] = true;
 761                                 }
 762                         }
 763
 764                         if ( !isset( $attr['domain'] ) ) {
 765                                 $attr['domain'] = $domain;
 766                         } elseif ( !Cookie::validateCookieDomain( $attr['domain'], $domain ) ) {
 767                                 return null;
 768                         }
 769
 770                         $this->setCookie( $name, $value, $attr );
 771                 }
 772         }
 773 }
 774
 775 /**
 776  * HttpRequest implemented using internal curl compiled into PHP
 777  */
 778 class CurlHttpRequest extends HttpRequest {
 779         static $curlMessageMap = array(
 780                 6 => 'http-host-unreachable',
 781                 28 => 'http-timed-out'
 782         );
 783
 784         protected $curlOptions = array();
 785         protected $headerText = "";
 786
 787         protected function readHeader( $fh, $content ) {
 788                 $this->headerText .= $content;
 789                 return strlen( $content );
 790         }
 791
 792         public function execute() {
 793                 parent::execute();
 794
 795                 if ( !$this->status->isOK() ) {
 796                         return $this->status;
 797                 }
 798
 799                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 800                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 801                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 802                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 803                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 804                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 805                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 806
 807                 /* not sure these two are actually necessary */
 808                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 809                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 810                 }
 811                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 812
 813                 if ( isset( $this->sslVerifyHost ) ) {
 814                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 815                 }
 816
 817                 if ( isset( $this->sslVerifyCert ) ) {
 818                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 819                 }
 820
 821                 if ( $this->caInfo ) {
 822                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 823                 }
 824
 825                 if ( $this->headersOnly ) {
 826                         $this->curlOptions[CURLOPT_NOBODY] = true;
 827                         $this->curlOptions[CURLOPT_HEADER] = true;
 828                 } elseif ( $this->method == 'POST' ) {
 829                         $this->curlOptions[CURLOPT_POST] = true;
 830                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 831                         // Suppress 'Expect: 100-continue' header, as some servers
 832                         // will reject it with a 417 and Curl won't auto retry
 833                         // with HTTP 1.0 fallback
 834                         $this->reqHeaders['Expect'] = '';
 835                 } else {
 836                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 837                 }
 838
 839                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 840
 841                 $curlHandle = curl_init( $this->url );
 842
 843                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 844                         throw new MWException( "Error setting curl options." );
 845                 }
 846
 847                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 848                         if ( ! @curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 849                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 850                                         "Probably safe_mode or open_basedir is set.\n" );
 851                                 // Continue the processing. If it were in curl_setopt_array,
 852                                 // processing would have halted on its entry
 853                         }
 854                 }
 855
 856                 if ( false === curl_exec( $curlHandle ) ) {
 857                         $code = curl_error( $curlHandle );
 858
 859                         if ( isset( self::$curlMessageMap[$code] ) ) {
 860                                 $this->status->fatal( self::$curlMessageMap[$code] );
 861                         } else {
 862                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 863                         }
 864                 } else {
 865                         $this->headerList = explode( "\r\n", $this->headerText );
 866                 }
 867
 868                 curl_close( $curlHandle );
 869
 870                 $this->parseHeader();
 871                 $this->setStatus();
 872
 873                 return $this->status;
 874         }
 875
 876         public function canFollowRedirects() {
 877                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 878                         wfDebug( "Cannot follow redirects in safe mode\n" );
 879                         return false;
 880                 }
 881
 882                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 883                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 884                         return false;
 885                 }
 886
 887                 return true;
 888         }
 889 }
 890
 891 class PhpHttpRequest extends HttpRequest {
 892         protected function urlToTcp( $url ) {
 893                 $parsedUrl = parse_url( $url );
 894
 895                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 896         }
 897
 898         public function execute() {
 899                 parent::execute();
 900
 901                 // At least on Centos 4.8 with PHP 5.1.6, using max_redirects to follow redirects
 902                 // causes a segfault
 903                 $manuallyRedirect = version_compare( phpversion(), '5.1.7', '<' );
 904
 905                 if ( $this->parsedUrl['scheme'] != 'http' ) {
 906                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 907                 }
 908
 909                 $this->reqHeaders['Accept'] = "*/*";
 910                 if ( $this->method == 'POST' ) {
 911                         // Required for HTTP 1.0 POSTs
 912                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 913                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 914                 }
 915
 916                 $options = array();
 917                 if ( $this->proxy && !$this->noProxy ) {
 918                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 919                         $options['request_fulluri'] = true;
 920                 }
 921
 922                 if ( !$this->followRedirects || $manuallyRedirect ) {
 923                         $options['max_redirects'] = 0;
 924                 } else {
 925                         $options['max_redirects'] = $this->maxRedirects;
 926                 }
 927
 928                 $options['method'] = $this->method;
 929                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 930                 // Note that at some future point we may want to support
 931                 // HTTP/1.1, but we'd have to write support for chunking
 932                 // in version of PHP < 5.3.1
 933                 $options['protocol_version'] = "1.0";
 934
 935                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 936                 // Only works on 5.2.10+
 937                 $options['ignore_errors'] = true;
 938
 939                 if ( $this->postData ) {
 940                         $options['content'] = $this->postData;
 941                 }
 942
 943                 $oldTimeout = false;
 944                 if ( version_compare( '5.2.1', phpversion(), '>' ) ) {
 945                         $oldTimeout = ini_set( 'default_socket_timeout', $this->timeout );
 946                 } else {
 947                         $options['timeout'] = $this->timeout;
 948                 }
 949
 950                 $context = stream_context_create( array( 'http' => $options ) );
 951
 952                 $this->headerList = array();
 953                 $reqCount = 0;
 954                 $url = $this->url;
 955
 956                 do {
 957                         $reqCount++;
 958                         wfSuppressWarnings();
 959                         $fh = fopen( $url, "r", false, $context );
 960                         wfRestoreWarnings();
 961
 962                         if ( !$fh ) {
 963                                 break;
 964                         }
 965
 966                         $result = stream_get_meta_data( $fh );
 967                         $this->headerList = $result['wrapper_data'];
 968                         $this->parseHeader();
 969
 970                         if ( !$manuallyRedirect || !$this->followRedirects ) {
 971                                 break;
 972                         }
 973
 974                         # Handle manual redirection
 975                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 976                                 break;
 977                         }
 978                         # Check security of URL
 979                         $url = $this->getResponseHeader( "Location" );
 980
 981                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 982                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 983                                 break;
 984                         }
 985                 } while ( true );
 986
 987                 if ( $oldTimeout !== false ) {
 988                         ini_set( 'default_socket_timeout', $oldTimeout );
 989                 }
 990
 991                 $this->setStatus();
 992
 993                 if ( $fh === false ) {
 994                         $this->status->fatal( 'http-request-error' );
 995                         return $this->status;
 996                 }
 997
 998                 if ( $result['timed_out'] ) {
 999                         $this->status->fatal( 'http-timed-out', $this->url );
1000                         return $this->status;
1001                 }
1002
1003                 if ( $this->status->isOK() ) {
1004                         while ( !feof( $fh ) ) {
1005                                 $buf = fread( $fh, 8192 );
1006
1007                                 if ( $buf === false ) {
1008                                         $this->status->fatal( 'http-read-error' );
1009                                         break;
1010                                 }
1011
1012                                 if ( strlen( $buf ) ) {
1013                                         call_user_func( $this->callback, $fh, $buf );
1014                                 }
1015                         }
1016                 }
1017                 fclose( $fh );
1018
1019                 return $this->status;
1020         }
1021 }