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, $message );
 402                 }
 403         }
 404
 405         /**
 406          * Get the member variable status for an HTTP Request
 407          *
 408          * @return Integer
 409          */
 410         public function getStatus() {
 411                 if ( !$this->respHeaders ) {
 412                         $this->parseHeader();
 413                 }
 414
 415                 return (int)$this->respStatus;
 416         }
 417
 418
 419         /**
 420          * Returns true if the last status code was a redirect.
 421          *
 422          * @return Boolean
 423          */
 424         public function isRedirect() {
 425                 if ( !$this->respHeaders ) {
 426                         $this->parseHeader();
 427                 }
 428
 429                 $status = (int)$this->respStatus;
 430
 431                 if ( $status >= 300 && $status <= 303 ) {
 432                         return true;
 433                 }
 434
 435                 return false;
 436         }
 437
 438         /**
 439          * Returns an associative array of response headers after the
 440          * request has been executed.  Because some headers
 441          * (e.g. Set-Cookie) can appear more than once the, each value of
 442          * the associative array is an array of the values given.
 443          *
 444          * @return Array
 445          */
 446         public function getResponseHeaders() {
 447                 if ( !$this->respHeaders ) {
 448                         $this->parseHeader();
 449                 }
 450
 451                 return $this->respHeaders;
 452         }
 453
 454         /**
 455          * Returns the value of the given response header.
 456          *
 457          * @param $header String
 458          * @return String
 459          */
 460         public function getResponseHeader( $header ) {
 461                 if ( !$this->respHeaders ) {
 462                         $this->parseHeader();
 463                 }
 464
 465                 if ( isset( $this->respHeaders[strtolower ( $header ) ] ) ) {
 466                         $v = $this->respHeaders[strtolower ( $header ) ];
 467                         return $v[count( $v ) - 1];
 468                 }
 469
 470                 return null;
 471         }
 472
 473         /**
 474          * Tells the HttpRequest object to use this pre-loaded CookieJar.
 475          *
 476          * @param $jar CookieJar
 477          */
 478         public function setCookieJar( $jar ) {
 479                 $this->cookieJar = $jar;
 480         }
 481
 482         /**
 483          * Returns the cookie jar in use.
 484          *
 485          * @returns CookieJar
 486          */
 487         public function getCookieJar() {
 488                 if ( !$this->respHeaders ) {
 489                         $this->parseHeader();
 490                 }
 491
 492                 return $this->cookieJar;
 493         }
 494
 495         /**
 496          * Sets a cookie.  Used before a request to set up any individual
 497          * cookies.      Used internally after a request to parse the
 498          * Set-Cookie headers.
 499          * @see Cookie::set
 500          */
 501         public function setCookie( $name, $value = null, $attr = null ) {
 502                 if ( !$this->cookieJar ) {
 503                         $this->cookieJar = new CookieJar;
 504                 }
 505
 506                 $this->cookieJar->setCookie( $name, $value, $attr );
 507         }
 508
 509         /**
 510          * Parse the cookies in the response headers and store them in the cookie jar.
 511          */
 512         protected function parseCookies() {
 513                 if ( !$this->cookieJar ) {
 514                         $this->cookieJar = new CookieJar;
 515                 }
 516
 517                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 518                         $url = parse_url( $this->getFinalUrl() );
 519                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 520                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 521                         }
 522                 }
 523         }
 524
 525         /**
 526          * Returns the final URL after all redirections.
 527          *
 528          * @return String
 529          */
 530         public function getFinalUrl() {
 531                 $location = $this->getResponseHeader( "Location" );
 532
 533                 if ( $location ) {
 534                         return $location;
 535                 }
 536
 537                 return $this->url;
 538         }
 539
 540         /**
 541          * Returns true if the backend can follow redirects. Overridden by the
 542          * child classes.
 543          */
 544         public function canFollowRedirects() {
 545                 return true;
 546         }
 547 }
 548
 549
 550 class Cookie {
 551         protected $name;
 552         protected $value;
 553         protected $expires;
 554         protected $path;
 555         protected $domain;
 556         protected $isSessionKey = true;
 557         // TO IMPLEMENT  protected $secure
 558         // TO IMPLEMENT? protected $maxAge (add onto expires)
 559         // TO IMPLEMENT? protected $version
 560         // TO IMPLEMENT? protected $comment
 561
 562         function __construct( $name, $value, $attr ) {
 563                 $this->name = $name;
 564                 $this->set( $value, $attr );
 565         }
 566
 567         /**
 568          * Sets a cookie.  Used before a request to set up any individual
 569          * cookies.      Used internally after a request to parse the
 570          * Set-Cookie headers.
 571          *
 572          * @param $value String: the value of the cookie
 573          * @param $attr Array: possible key/values:
 574          *              expires  A date string
 575          *              path     The path this cookie is used on
 576          *              domain   Domain this cookie is used on
 577          */
 578         public function set( $value, $attr ) {
 579                 $this->value = $value;
 580
 581                 if ( isset( $attr['expires'] ) ) {
 582                         $this->isSessionKey = false;
 583                         $this->expires = strtotime( $attr['expires'] );
 584                 }
 585
 586                 if ( isset( $attr['path'] ) ) {
 587                         $this->path = $attr['path'];
 588                 } else {
 589                         $this->path = "/";
 590                 }
 591
 592                 if ( isset( $attr['domain'] ) ) {
 593                         if ( self::validateCookieDomain( $attr['domain'] ) ) {
 594                                 $this->domain = $attr['domain'];
 595                         }
 596                 } else {
 597                         throw new MWException( "You must specify a domain." );
 598                 }
 599         }
 600
 601         /**
 602          * Return the true if the cookie is valid is valid.  Otherwise,
 603          * false.  The uses a method similar to IE cookie security
 604          * described here:
 605          * http://kuza55.blogspot.com/2008/02/understanding-cookie-security.html
 606          * A better method might be to use a blacklist like
 607          * http://publicsuffix.org/
 608          *
 609          * @param $domain String: the domain to validate
 610          * @param $originDomain String: (optional) the domain the cookie originates from
 611          * @return Boolean
 612          */
 613         public static function validateCookieDomain( $domain, $originDomain = null ) {
 614                 // Don't allow a trailing dot
 615                 if ( substr( $domain, -1 ) == "." ) {
 616                         return false;
 617                 }
 618
 619                 $dc = explode( ".", $domain );
 620
 621                 // Only allow full, valid IP addresses
 622                 if ( preg_match( '/^[0-9.]+$/', $domain ) ) {
 623                         if ( count( $dc ) != 4 ) {
 624                                 return false;
 625                         }
 626
 627                         if ( ip2long( $domain ) === false ) {
 628                                 return false;
 629                         }
 630
 631                         if ( $originDomain == null || $originDomain == $domain ) {
 632                                 return true;
 633                         }
 634
 635                 }
 636
 637                 // Don't allow cookies for "co.uk" or "gov.uk", etc, but allow "supermarket.uk"
 638                 if ( strrpos( $domain, "." ) - strlen( $domain )  == -3 ) {
 639                         if ( ( count( $dc ) == 2 && strlen( $dc[0] ) <= 2 )
 640                                 || ( count( $dc ) == 3 && strlen( $dc[0] ) == "" && strlen( $dc[1] ) <= 2 ) ) {
 641                                 return false;
 642                         }
 643                         if ( ( count( $dc ) == 2 || ( count( $dc ) == 3 && $dc[0] == "" ) )
 644                                 && preg_match( '/(com|net|org|gov|edu)\...$/', $domain ) ) {
 645                                 return false;
 646                         }
 647                 }
 648
 649                 if ( $originDomain != null ) {
 650                         if ( substr( $domain, 0, 1 ) != "." && $domain != $originDomain ) {
 651                                 return false;
 652                         }
 653
 654                         if ( substr( $domain, 0, 1 ) == "."
 655                                 && substr_compare( $originDomain, $domain, -strlen( $domain ),
 656                                                                    strlen( $domain ), TRUE ) != 0 ) {
 657                                 return false;
 658                         }
 659                 }
 660
 661                 return true;
 662         }
 663
 664         /**
 665          * Serialize the cookie jar into a format useful for HTTP Request headers.
 666          *
 667          * @param $path String: the path that will be used. Required.
 668          * @param $domain String: the domain that will be used. Required.
 669          * @return String
 670          */
 671         public function serializeToHttpRequest( $path, $domain ) {
 672                 $ret = "";
 673
 674                 if ( $this->canServeDomain( $domain )
 675                                 && $this->canServePath( $path )
 676                                 && $this->isUnExpired() ) {
 677                         $ret = $this->name . "=" . $this->value;
 678                 }
 679
 680                 return $ret;
 681         }
 682
 683         protected function canServeDomain( $domain ) {
 684                 if ( $domain == $this->domain
 685                         || ( strlen( $domain ) > strlen( $this->domain )
 686                                  && substr( $this->domain, 0, 1 ) == "."
 687                                  && substr_compare( $domain, $this->domain, -strlen( $this->domain ),
 688                                                                         strlen( $this->domain ), TRUE ) == 0 ) ) {
 689                         return true;
 690                 }
 691
 692                 return false;
 693         }
 694
 695         protected function canServePath( $path ) {
 696                 if ( $this->path && substr_compare( $this->path, $path, 0, strlen( $this->path ) ) == 0 ) {
 697                         return true;
 698                 }
 699
 700                 return false;
 701         }
 702
 703         protected function isUnExpired() {
 704                 if ( $this->isSessionKey || $this->expires > time() ) {
 705                         return true;
 706                 }
 707
 708                 return false;
 709         }
 710 }
 711
 712 class CookieJar {
 713         private $cookie = array();
 714
 715         /**
 716          * Set a cookie in the cookie jar.      Make sure only one cookie per-name exists.
 717          * @see Cookie::set()
 718          */
 719         public function setCookie ( $name, $value, $attr ) {
 720                 /* cookies: case insensitive, so this should work.
 721                  * We'll still send the cookies back in the same case we got them, though.
 722                  */
 723                 $index = strtoupper( $name );
 724
 725                 if ( isset( $this->cookie[$index] ) ) {
 726                         $this->cookie[$index]->set( $value, $attr );
 727                 } else {
 728                         $this->cookie[$index] = new Cookie( $name, $value, $attr );
 729                 }
 730         }
 731
 732         /**
 733          * @see Cookie::serializeToHttpRequest
 734          */
 735         public function serializeToHttpRequest( $path, $domain ) {
 736                 $cookies = array();
 737
 738                 foreach ( $this->cookie as $c ) {
 739                         $serialized = $c->serializeToHttpRequest( $path, $domain );
 740
 741                         if ( $serialized ) {
 742                                 $cookies[] = $serialized;
 743                         }
 744                 }
 745
 746                 return implode( "; ", $cookies );
 747         }
 748
 749         /**
 750          * Parse the content of an Set-Cookie HTTP Response header.
 751          *
 752          * @param $cookie String
 753          * @param $domain String: cookie's domain
 754          */
 755         public function parseCookieResponseHeader ( $cookie, $domain ) {
 756                 $len = strlen( "Set-Cookie:" );
 757
 758                 if ( substr_compare( "Set-Cookie:", $cookie, 0, $len, TRUE ) === 0 ) {
 759                         $cookie = substr( $cookie, $len );
 760                 }
 761
 762                 $bit = array_map( 'trim', explode( ";", $cookie ) );
 763
 764                 if ( count( $bit ) >= 1 ) {
 765                         list( $name, $value ) = explode( "=", array_shift( $bit ), 2 );
 766                         $attr = array();
 767
 768                         foreach ( $bit as $piece ) {
 769                                 $parts = explode( "=", $piece );
 770                                 if ( count( $parts ) > 1 ) {
 771                                         $attr[strtolower( $parts[0] )] = $parts[1];
 772                                 } else {
 773                                         $attr[strtolower( $parts[0] )] = true;
 774                                 }
 775                         }
 776
 777                         if ( !isset( $attr['domain'] ) ) {
 778                                 $attr['domain'] = $domain;
 779                         } elseif ( !Cookie::validateCookieDomain( $attr['domain'], $domain ) ) {
 780                                 return null;
 781                         }
 782
 783                         $this->setCookie( $name, $value, $attr );
 784                 }
 785         }
 786 }
 787
 788 /**
 789  * HttpRequest implemented using internal curl compiled into PHP
 790  */
 791 class CurlHttpRequest extends HttpRequest {
 792         static $curlMessageMap = array(
 793                 6 => 'http-host-unreachable',
 794                 28 => 'http-timed-out'
 795         );
 796
 797         protected $curlOptions = array();
 798         protected $headerText = "";
 799
 800         protected function readHeader( $fh, $content ) {
 801                 $this->headerText .= $content;
 802                 return strlen( $content );
 803         }
 804
 805         public function execute() {
 806                 parent::execute();
 807
 808                 if ( !$this->status->isOK() ) {
 809                         return $this->status;
 810                 }
 811
 812                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 813                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 814                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 815                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 816                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 817                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 818                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 819
 820                 /* not sure these two are actually necessary */
 821                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 822                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 823                 }
 824                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 825
 826                 if ( isset( $this->sslVerifyHost ) ) {
 827                         $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost;
 828                 }
 829
 830                 if ( isset( $this->sslVerifyCert ) ) {
 831                         $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 832                 }
 833
 834                 if ( $this->caInfo ) {
 835                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 836                 }
 837
 838                 if ( $this->headersOnly ) {
 839                         $this->curlOptions[CURLOPT_NOBODY] = true;
 840                         $this->curlOptions[CURLOPT_HEADER] = true;
 841                 } elseif ( $this->method == 'POST' ) {
 842                         $this->curlOptions[CURLOPT_POST] = true;
 843                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 844                         // Suppress 'Expect: 100-continue' header, as some servers
 845                         // will reject it with a 417 and Curl won't auto retry
 846                         // with HTTP 1.0 fallback
 847                         $this->reqHeaders['Expect'] = '';
 848                 } else {
 849                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 850                 }
 851
 852                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 853
 854                 $curlHandle = curl_init( $this->url );
 855
 856                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 857                         throw new MWException( "Error setting curl options." );
 858                 }
 859
 860                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 861                         if ( ! @curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 862                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 863                                         "Probably safe_mode or open_basedir is set.\n" );
 864                                 // Continue the processing. If it were in curl_setopt_array,
 865                                 // processing would have halted on its entry
 866                         }
 867                 }
 868
 869                 if ( false === curl_exec( $curlHandle ) ) {
 870                         $code = curl_error( $curlHandle );
 871
 872                         if ( isset( self::$curlMessageMap[$code] ) ) {
 873                                 $this->status->fatal( self::$curlMessageMap[$code] );
 874                         } else {
 875                                 $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 876                         }
 877                 } else {
 878                         $this->headerList = explode( "\r\n", $this->headerText );
 879                 }
 880
 881                 curl_close( $curlHandle );
 882
 883                 $this->parseHeader();
 884                 $this->setStatus();
 885
 886                 return $this->status;
 887         }
 888
 889         public function canFollowRedirects() {
 890                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 891                         wfDebug( "Cannot follow redirects in safe mode\n" );
 892                         return false;
 893                 }
 894
 895                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 896                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 897                         return false;
 898                 }
 899
 900                 return true;
 901         }
 902 }
 903
 904 class PhpHttpRequest extends HttpRequest {
 905         protected function urlToTcp( $url ) {
 906                 $parsedUrl = parse_url( $url );
 907
 908                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 909         }
 910
 911         public function execute() {
 912                 parent::execute();
 913
 914                 // At least on Centos 4.8 with PHP 5.1.6, using max_redirects to follow redirects
 915                 // causes a segfault
 916                 $manuallyRedirect = version_compare( phpversion(), '5.1.7', '<' );
 917
 918                 if ( $this->parsedUrl['scheme'] != 'http' ) {
 919                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 920                 }
 921
 922                 $this->reqHeaders['Accept'] = "*/*";
 923                 if ( $this->method == 'POST' ) {
 924                         // Required for HTTP 1.0 POSTs
 925                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 926                         $this->reqHeaders['Content-type'] = "application/x-www-form-urlencoded";
 927                 }
 928
 929                 $options = array();
 930                 if ( $this->proxy && !$this->noProxy ) {
 931                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 932                         $options['request_fulluri'] = true;
 933                 }
 934
 935                 if ( !$this->followRedirects || $manuallyRedirect ) {
 936                         $options['max_redirects'] = 0;
 937                 } else {
 938                         $options['max_redirects'] = $this->maxRedirects;
 939                 }
 940
 941                 $options['method'] = $this->method;
 942                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 943                 // Note that at some future point we may want to support
 944                 // HTTP/1.1, but we'd have to write support for chunking
 945                 // in version of PHP < 5.3.1
 946                 $options['protocol_version'] = "1.0";
 947
 948                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 949                 // Only works on 5.2.10+
 950                 $options['ignore_errors'] = true;
 951
 952                 if ( $this->postData ) {
 953                         $options['content'] = $this->postData;
 954                 }
 955
 956                 $oldTimeout = false;
 957                 if ( version_compare( '5.2.1', phpversion(), '>' ) ) {
 958                         $oldTimeout = ini_set( 'default_socket_timeout', $this->timeout );
 959                 } else {
 960                         $options['timeout'] = $this->timeout;
 961                 }
 962
 963                 $context = stream_context_create( array( 'http' => $options ) );
 964
 965                 $this->headerList = array();
 966                 $reqCount = 0;
 967                 $url = $this->url;
 968
 969                 do {
 970                         $reqCount++;
 971                         wfSuppressWarnings();
 972                         $fh = fopen( $url, "r", false, $context );
 973                         wfRestoreWarnings();
 974
 975                         if ( !$fh ) {
 976                                 break;
 977                         }
 978
 979                         $result = stream_get_meta_data( $fh );
 980                         $this->headerList = $result['wrapper_data'];
 981                         $this->parseHeader();
 982
 983                         if ( !$manuallyRedirect || !$this->followRedirects ) {
 984                                 break;
 985                         }
 986
 987                         # Handle manual redirection
 988                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 989                                 break;
 990                         }
 991                         # Check security of URL
 992                         $url = $this->getResponseHeader( "Location" );
 993
 994                         if ( substr( $url, 0, 7 ) !== 'http://' ) {
 995                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 996                                 break;
 997                         }
 998                 } while ( true );
 999
1000                 if ( $oldTimeout !== false ) {
1001                         ini_set( 'default_socket_timeout', $oldTimeout );
1002                 }
1003
1004                 $this->setStatus();
1005
1006                 if ( $fh === false ) {
1007                         $this->status->fatal( 'http-request-error' );
1008                         return $this->status;
1009                 }
1010
1011                 if ( $result['timed_out'] ) {
1012                         $this->status->fatal( 'http-timed-out', $this->url );
1013                         return $this->status;
1014                 }
1015
1016                 if ( $this->status->isOK() ) {
1017                         while ( !feof( $fh ) ) {
1018                                 $buf = fread( $fh, 8192 );
1019
1020                                 if ( $buf === false ) {
1021                                         $this->status->fatal( 'http-read-error' );
1022                                         break;
1023                                 }
1024
1025                                 if ( strlen( $buf ) ) {
1026                                         call_user_func( $this->callback, $fh, $buf );
1027                                 }
1028                         }
1029                 }
1030                 fclose( $fh );
1031
1032                 return $this->status;
1033         }
1034 }