includes/HttpFunctions.php

   1 <?php
   2 /**
   3  * Various HTTP related functions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup HTTP
  22  */
  23
  24 /**
  25  * @defgroup HTTP HTTP
  26  */
  27
  28 /**
  29  * Various HTTP related functions
  30  * @ingroup HTTP
  31  */
  32 class Http {
  33         static public $httpEngine = false;
  34
  35         /**
  36          * Perform an HTTP request
  37          *
  38          * @param string $method HTTP method. Usually GET/POST
  39          * @param string $url full URL to act on. If protocol-relative, will be expanded to an http:// URL
  40          * @param array $options options to pass to MWHttpRequest object.
  41          *      Possible keys for the array:
  42          *    - timeout             Timeout length in seconds
  43          *    - connectTimeout      Timeout for connection, in seconds (curl only)
  44          *    - postData            An array of key-value pairs or a url-encoded form data
  45          *    - proxy               The proxy to use.
  46          *                          Otherwise it will use $wgHTTPProxy (if set)
  47          *                          Otherwise it will use the environment variable "http_proxy" (if set)
  48          *    - noProxy             Don't use any proxy at all. Takes precedence over proxy value(s).
  49          *    - sslVerifyHost       Verify hostname against certificate
  50          *    - sslVerifyCert       Verify SSL certificate
  51          *    - caInfo              Provide CA information
  52          *    - maxRedirects        Maximum number of redirects to follow (defaults to 5)
  53          *    - followRedirects     Whether to follow redirects (defaults to false).
  54          *                                  Note: this should only be used when the target URL is trusted,
  55          *                                  to avoid attacks on intranet services accessible by HTTP.
  56          *    - userAgent           A user agent, if you want to override the default
  57          *                          MediaWiki/$wgVersion
  58          * @return Mixed: (bool)false on failure or a string on success
  59          */
  60         public static function request( $method, $url, $options = array() ) {
  61                 wfDebug( "HTTP: $method: $url\n" );
  62                 wfProfileIn( __METHOD__ . "-$method" );
  63
  64                 $options['method'] = strtoupper( $method );
  65
  66                 if ( !isset( $options['timeout'] ) ) {
  67                         $options['timeout'] = 'default';
  68                 }
  69                 if ( !isset( $options['connectTimeout'] ) ) {
  70                         $options['connectTimeout'] = 'default';
  71                 }
  72
  73                 $req = MWHttpRequest::factory( $url, $options );
  74                 $status = $req->execute();
  75
  76                 $content = false;
  77                 if ( $status->isOK() ) {
  78                         $content = $req->getContent();
  79                 }
  80                 wfProfileOut( __METHOD__ . "-$method" );
  81                 return $content;
  82         }
  83
  84         /**
  85          * Simple wrapper for Http::request( 'GET' )
  86          * @see Http::request()
  87          *
  88          * @param $url
  89          * @param $timeout string
  90          * @param $options array
  91          * @return string
  92          */
  93         public static function get( $url, $timeout = 'default', $options = array() ) {
  94                 $options['timeout'] = $timeout;
  95                 return Http::request( 'GET', $url, $options );
  96         }
  97
  98         /**
  99          * Simple wrapper for Http::request( 'POST' )
 100          * @see Http::request()
 101          *
 102          * @param $url
 103          * @param $options array
 104          * @return string
 105          */
 106         public static function post( $url, $options = array() ) {
 107                 return Http::request( 'POST', $url, $options );
 108         }
 109
 110         /**
 111          * Check if the URL can be served by localhost
 112          *
 113          * @param string $url full url to check
 114          * @return Boolean
 115          */
 116         public static function isLocalURL( $url ) {
 117                 global $wgCommandLineMode, $wgConf;
 118
 119                 if ( $wgCommandLineMode ) {
 120                         return false;
 121                 }
 122
 123                 // Extract host part
 124                 $matches = array();
 125                 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
 126                         $host = $matches[1];
 127                         // Split up dotwise
 128                         $domainParts = explode( '.', $host );
 129                         // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
 130                         $domainParts = array_reverse( $domainParts );
 131
 132                         $domain = '';
 133                         $countParts = count( $domainParts );
 134                         for ( $i = 0; $i < $countParts; $i++ ) {
 135                                 $domainPart = $domainParts[$i];
 136                                 if ( $i == 0 ) {
 137                                         $domain = $domainPart;
 138                                 } else {
 139                                         $domain = $domainPart . '.' . $domain;
 140                                 }
 141
 142                                 if ( $wgConf->isLocalVHost( $domain ) ) {
 143                                         return true;
 144                                 }
 145                         }
 146                 }
 147
 148                 return false;
 149         }
 150
 151         /**
 152          * A standard user-agent we can use for external requests.
 153          * @return String
 154          */
 155         public static function userAgent() {
 156                 global $wgVersion;
 157                 return "MediaWiki/$wgVersion";
 158         }
 159
 160         /**
 161          * Checks that the given URI is a valid one. Hardcoding the
 162          * protocols, because we only want protocols that both cURL
 163          * and php support.
 164          *
 165          * file:// should not be allowed here for security purpose (r67684)
 166          *
 167          * @todo FIXME this is wildly inaccurate and fails to actually check most stuff
 168          *
 169          * @param $uri Mixed: URI to check for validity
 170          * @return Boolean
 171          */
 172         public static function isValidURI( $uri ) {
 173                 return preg_match(
 174                         '/^https?:\/\/[^\/\s]\S*$/D',
 175                         $uri
 176                 );
 177         }
 178 }
 179
 180 /**
 181  * This wrapper class will call out to curl (if available) or fallback
 182  * to regular PHP if necessary for handling internal HTTP requests.
 183  *
 184  * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
 185  * PHP's HTTP extension.
 186  */
 187 class MWHttpRequest {
 188         const SUPPORTS_FILE_POSTS = false;
 189
 190         protected $content;
 191         protected $timeout = 'default';
 192         protected $headersOnly = null;
 193         protected $postData = null;
 194         protected $proxy = null;
 195         protected $noProxy = false;
 196         protected $sslVerifyHost = true;
 197         protected $sslVerifyCert = true;
 198         protected $caInfo = null;
 199         protected $method = "GET";
 200         protected $reqHeaders = array();
 201         protected $url;
 202         protected $parsedUrl;
 203         protected $callback;
 204         protected $maxRedirects = 5;
 205         protected $followRedirects = false;
 206
 207         /**
 208          * @var  CookieJar
 209          */
 210         protected $cookieJar;
 211
 212         protected $headerList = array();
 213         protected $respVersion = "0.9";
 214         protected $respStatus = "200 Ok";
 215         protected $respHeaders = array();
 216
 217         public $status;
 218
 219         /**
 220          * @param string $url url to use. If protocol-relative, will be expanded to an http:// URL
 221          * @param array $options (optional) extra params to pass (see Http::request())
 222          */
 223         protected function __construct( $url, $options = array() ) {
 224                 global $wgHTTPTimeout, $wgHTTPConnectTimeout;
 225
 226                 $this->url = wfExpandUrl( $url, PROTO_HTTP );
 227                 $this->parsedUrl = wfParseUrl( $this->url );
 228
 229                 if ( !$this->parsedUrl || !Http::isValidURI( $this->url ) ) {
 230                         $this->status = Status::newFatal( 'http-invalid-url' );
 231                 } else {
 232                         $this->status = Status::newGood( 100 ); // continue
 233                 }
 234
 235                 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
 236                         $this->timeout = $options['timeout'];
 237                 } else {
 238                         $this->timeout = $wgHTTPTimeout;
 239                 }
 240                 if ( isset( $options['connectTimeout'] ) && $options['connectTimeout'] != 'default' ) {
 241                         $this->connectTimeout = $options['connectTimeout'];
 242                 } else {
 243                         $this->connectTimeout = $wgHTTPConnectTimeout;
 244                 }
 245                 if ( isset( $options['userAgent'] ) ) {
 246                         $this->setUserAgent( $options['userAgent'] );
 247                 }
 248
 249                 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
 250                                 "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
 251
 252                 foreach ( $members as $o ) {
 253                         if ( isset( $options[$o] ) ) {
 254                                 // ensure that MWHttpRequest::method is always
 255                                 // uppercased. Bug 36137
 256                                 if ( $o == 'method' ) {
 257                                         $options[$o] = strtoupper( $options[$o] );
 258                                 }
 259                                 $this->$o = $options[$o];
 260                         }
 261                 }
 262
 263                 if ( $this->noProxy ) {
 264                         $this->proxy = ''; // noProxy takes precedence
 265                 }
 266         }
 267
 268         /**
 269          * Simple function to test if we can make any sort of requests at all, using
 270          * cURL or fopen()
 271          * @return bool
 272          */
 273         public static function canMakeRequests() {
 274                 return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
 275         }
 276
 277         /**
 278          * Generate a new request object
 279          * @param string $url url to use
 280          * @param array $options (optional) extra params to pass (see Http::request())
 281          * @throws MWException
 282          * @return CurlHttpRequest|PhpHttpRequest
 283          * @see MWHttpRequest::__construct
 284          */
 285         public static function factory( $url, $options = null ) {
 286                 if ( !Http::$httpEngine ) {
 287                         Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
 288                 } elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
 289                         throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
 290                                 ' Http::$httpEngine is set to "curl"' );
 291                 }
 292
 293                 switch ( Http::$httpEngine ) {
 294                         case 'curl':
 295                                 return new CurlHttpRequest( $url, $options );
 296                         case 'php':
 297                                 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
 298                                         throw new MWException( __METHOD__ . ': allow_url_fopen '.
 299                                                 'needs to be enabled for pure PHP http requests to '.
 300                                                 'work. If possible, curl should be used instead. See '.
 301                                                 'http://php.net/curl.' );
 302                                 }
 303                                 return new PhpHttpRequest( $url, $options );
 304                         default:
 305                                 throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
 306                 }
 307         }
 308
 309         /**
 310          * Get the body, or content, of the response to the request
 311          *
 312          * @return String
 313          */
 314         public function getContent() {
 315                 return $this->content;
 316         }
 317
 318         /**
 319          * Set the parameters of the request
 320          *
 321          * @param $args Array
 322          * @todo overload the args param
 323          */
 324         public function setData( $args ) {
 325                 $this->postData = $args;
 326         }
 327
 328         /**
 329          * Take care of setting up the proxy (do nothing if "noProxy" is set)
 330          *
 331          * @return void
 332          */
 333         public function proxySetup() {
 334                 global $wgHTTPProxy;
 335
 336                 // If there is an explicit proxy set and proxies are not disabled, then use it
 337                 if ( $this->proxy && !$this->noProxy ) {
 338                         return;
 339                 }
 340
 341                 // Otherwise, fallback to $wgHTTPProxy/http_proxy (when set) if this is not a machine
 342                 // local URL and proxies are not disabled
 343                 if ( Http::isLocalURL( $this->url ) || $this->noProxy ) {
 344                         $this->proxy = '';
 345                 } elseif ( $wgHTTPProxy ) {
 346                         $this->proxy = $wgHTTPProxy;
 347                 } elseif ( getenv( "http_proxy" ) ) {
 348                         $this->proxy = getenv( "http_proxy" );
 349                 }
 350         }
 351
 352         /**
 353          * Set the referrer header
 354          */
 355         public function setReferer( $url ) {
 356                 $this->setHeader( 'Referer', $url );
 357         }
 358
 359         /**
 360          * Set the user agent
 361          * @param $UA string
 362          */
 363         public function setUserAgent( $UA ) {
 364                 $this->setHeader( 'User-Agent', $UA );
 365         }
 366
 367         /**
 368          * Set an arbitrary header
 369          * @param $name
 370          * @param $value
 371          */
 372         public function setHeader( $name, $value ) {
 373                 // I feel like I should normalize the case here...
 374                 $this->reqHeaders[$name] = $value;
 375         }
 376
 377         /**
 378          * Get an array of the headers
 379          * @return array
 380          */
 381         public function getHeaderList() {
 382                 $list = array();
 383
 384                 if ( $this->cookieJar ) {
 385                         $this->reqHeaders['Cookie'] =
 386                                 $this->cookieJar->serializeToHttpRequest(
 387                                         $this->parsedUrl['path'],
 388                                         $this->parsedUrl['host']
 389                                 );
 390                 }
 391
 392                 foreach ( $this->reqHeaders as $name => $value ) {
 393                         $list[] = "$name: $value";
 394                 }
 395
 396                 return $list;
 397         }
 398
 399         /**
 400          * Set a read callback to accept data read from the HTTP request.
 401          * By default, data is appended to an internal buffer which can be
 402          * retrieved through $req->getContent().
 403          *
 404          * To handle data as it comes in -- especially for large files that
 405          * would not fit in memory -- you can instead set your own callback,
 406          * in the form function($resource, $buffer) where the first parameter
 407          * is the low-level resource being read (implementation specific),
 408          * and the second parameter is the data buffer.
 409          *
 410          * You MUST return the number of bytes handled in the buffer; if fewer
 411          * bytes are reported handled than were passed to you, the HTTP fetch
 412          * will be aborted.
 413          *
 414          * @param $callback Callback
 415          * @throws MWException
 416          */
 417         public function setCallback( $callback ) {
 418                 if ( !is_callable( $callback ) ) {
 419                         throw new MWException( 'Invalid MwHttpRequest callback' );
 420                 }
 421                 $this->callback = $callback;
 422         }
 423
 424         /**
 425          * A generic callback to read the body of the response from a remote
 426          * server.
 427          *
 428          * @param $fh handle
 429          * @param $content String
 430          * @return int
 431          */
 432         public function read( $fh, $content ) {
 433                 $this->content .= $content;
 434                 return strlen( $content );
 435         }
 436
 437         /**
 438          * Take care of whatever is necessary to perform the URI request.
 439          *
 440          * @return Status
 441          */
 442         public function execute() {
 443                 global $wgTitle;
 444
 445                 wfProfileIn( __METHOD__ );
 446
 447                 $this->content = "";
 448
 449                 if ( strtoupper( $this->method ) == "HEAD" ) {
 450                         $this->headersOnly = true;
 451                 }
 452
 453                 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders['Referer'] ) ) {
 454                         $this->setReferer( wfExpandUrl( $wgTitle->getFullURL(), PROTO_CURRENT ) );
 455                 }
 456
 457                 $this->proxySetup(); // set up any proxy as needed
 458
 459                 if ( !$this->callback ) {
 460                         $this->setCallback( array( $this, 'read' ) );
 461                 }
 462
 463                 if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
 464                         $this->setUserAgent( Http::userAgent() );
 465                 }
 466
 467                 wfProfileOut( __METHOD__ );
 468         }
 469
 470         /**
 471          * Parses the headers, including the HTTP status code and any
 472          * Set-Cookie headers.  This function expects the headers to be
 473          * found in an array in the member variable headerList.
 474          */
 475         protected function parseHeader() {
 476                 wfProfileIn( __METHOD__ );
 477
 478                 $lastname = "";
 479
 480                 foreach ( $this->headerList as $header ) {
 481                         if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
 482                                 $this->respVersion = $match[1];
 483                                 $this->respStatus = $match[2];
 484                         } elseif ( preg_match( "#^[ \t]#", $header ) ) {
 485                                 $last = count( $this->respHeaders[$lastname] ) - 1;
 486                                 $this->respHeaders[$lastname][$last] .= "\r\n$header";
 487                         } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
 488                                 $this->respHeaders[strtolower( $match[1] )][] = $match[2];
 489                                 $lastname = strtolower( $match[1] );
 490                         }
 491                 }
 492
 493                 $this->parseCookies();
 494
 495                 wfProfileOut( __METHOD__ );
 496         }
 497
 498         /**
 499          * Sets HTTPRequest status member to a fatal value with the error
 500          * message if the returned integer value of the status code was
 501          * not successful (< 300) or a redirect (>=300 and < 400).  (see
 502          * RFC2616, section 10,
 503          * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
 504          * list of status codes.)
 505          */
 506         protected function setStatus() {
 507                 if ( !$this->respHeaders ) {
 508                         $this->parseHeader();
 509                 }
 510
 511                 if ( (int)$this->respStatus > 399 ) {
 512                         list( $code, $message ) = explode( " ", $this->respStatus, 2 );
 513                         $this->status->fatal( "http-bad-status", $code, $message );
 514                 }
 515         }
 516
 517         /**
 518          * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
 519          * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
 520          * for a list of status codes.)
 521          *
 522          * @return Integer
 523          */
 524         public function getStatus() {
 525                 if ( !$this->respHeaders ) {
 526                         $this->parseHeader();
 527                 }
 528
 529                 return (int)$this->respStatus;
 530         }
 531
 532         /**
 533          * Returns true if the last status code was a redirect.
 534          *
 535          * @return Boolean
 536          */
 537         public function isRedirect() {
 538                 if ( !$this->respHeaders ) {
 539                         $this->parseHeader();
 540                 }
 541
 542                 $status = (int)$this->respStatus;
 543
 544                 if ( $status >= 300 && $status <= 303 ) {
 545                         return true;
 546                 }
 547
 548                 return false;
 549         }
 550
 551         /**
 552          * Returns an associative array of response headers after the
 553          * request has been executed.  Because some headers
 554          * (e.g. Set-Cookie) can appear more than once the, each value of
 555          * the associative array is an array of the values given.
 556          *
 557          * @return Array
 558          */
 559         public function getResponseHeaders() {
 560                 if ( !$this->respHeaders ) {
 561                         $this->parseHeader();
 562                 }
 563
 564                 return $this->respHeaders;
 565         }
 566
 567         /**
 568          * Returns the value of the given response header.
 569          *
 570          * @param $header String
 571          * @return String
 572          */
 573         public function getResponseHeader( $header ) {
 574                 if ( !$this->respHeaders ) {
 575                         $this->parseHeader();
 576                 }
 577
 578                 if ( isset( $this->respHeaders[strtolower( $header )] ) ) {
 579                         $v = $this->respHeaders[strtolower( $header )];
 580                         return $v[count( $v ) - 1];
 581                 }
 582
 583                 return null;
 584         }
 585
 586         /**
 587          * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
 588          *
 589          * @param $jar CookieJar
 590          */
 591         public function setCookieJar( $jar ) {
 592                 $this->cookieJar = $jar;
 593         }
 594
 595         /**
 596          * Returns the cookie jar in use.
 597          *
 598          * @return CookieJar
 599          */
 600         public function getCookieJar() {
 601                 if ( !$this->respHeaders ) {
 602                         $this->parseHeader();
 603                 }
 604
 605                 return $this->cookieJar;
 606         }
 607
 608         /**
 609          * Sets a cookie. Used before a request to set up any individual
 610          * cookies. Used internally after a request to parse the
 611          * Set-Cookie headers.
 612          * @see Cookie::set
 613          * @param $name
 614          * @param $value null
 615          * @param $attr null
 616          */
 617         public function setCookie( $name, $value = null, $attr = null ) {
 618                 if ( !$this->cookieJar ) {
 619                         $this->cookieJar = new CookieJar;
 620                 }
 621
 622                 $this->cookieJar->setCookie( $name, $value, $attr );
 623         }
 624
 625         /**
 626          * Parse the cookies in the response headers and store them in the cookie jar.
 627          */
 628         protected function parseCookies() {
 629                 wfProfileIn( __METHOD__ );
 630
 631                 if ( !$this->cookieJar ) {
 632                         $this->cookieJar = new CookieJar;
 633                 }
 634
 635                 if ( isset( $this->respHeaders['set-cookie'] ) ) {
 636                         $url = parse_url( $this->getFinalUrl() );
 637                         foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
 638                                 $this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
 639                         }
 640                 }
 641
 642                 wfProfileOut( __METHOD__ );
 643         }
 644
 645         /**
 646          * Returns the final URL after all redirections.
 647          *
 648          * Relative values of the "Location" header are incorrect as
 649          * stated in RFC, however they do happen and modern browsers
 650          * support them.  This function loops backwards through all
 651          * locations in order to build the proper absolute URI - Marooned
 652          * at wikia-inc.com
 653          *
 654          * Note that the multiple Location: headers are an artifact of
 655          * CURL -- they shouldn't actually get returned this way. Rewrite
 656          * this when bug 29232 is taken care of (high-level redirect
 657          * handling rewrite).
 658          *
 659          * @return string
 660          */
 661         public function getFinalUrl() {
 662                 $headers = $this->getResponseHeaders();
 663
 664                 //return full url (fix for incorrect but handled relative location)
 665                 if ( isset( $headers['location'] ) ) {
 666                         $locations = $headers['location'];
 667                         $domain = '';
 668                         $foundRelativeURI = false;
 669                         $countLocations = count( $locations );
 670
 671                         for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
 672                                 $url = parse_url( $locations[$i] );
 673
 674                                 if ( isset( $url['host'] ) ) {
 675                                         $domain = $url['scheme'] . '://' . $url['host'];
 676                                         break; //found correct URI (with host)
 677                                 } else {
 678                                         $foundRelativeURI = true;
 679                                 }
 680                         }
 681
 682                         if ( $foundRelativeURI ) {
 683                                 if ( $domain ) {
 684                                         return $domain . $locations[$countLocations - 1];
 685                                 } else {
 686                                         $url = parse_url( $this->url );
 687                                         if ( isset( $url['host'] ) ) {
 688                                                 return $url['scheme'] . '://' . $url['host'] .
 689                                                         $locations[$countLocations - 1];
 690                                         }
 691                                 }
 692                         } else {
 693                                 return $locations[$countLocations - 1];
 694                         }
 695                 }
 696
 697                 return $this->url;
 698         }
 699
 700         /**
 701          * Returns true if the backend can follow redirects. Overridden by the
 702          * child classes.
 703          * @return bool
 704          */
 705         public function canFollowRedirects() {
 706                 return true;
 707         }
 708 }
 709
 710 /**
 711  * MWHttpRequest implemented using internal curl compiled into PHP
 712  */
 713 class CurlHttpRequest extends MWHttpRequest {
 714         const SUPPORTS_FILE_POSTS = true;
 715
 716         protected $curlOptions = array();
 717         protected $headerText = "";
 718
 719         /**
 720          * @param $fh
 721          * @param $content
 722          * @return int
 723          */
 724         protected function readHeader( $fh, $content ) {
 725                 $this->headerText .= $content;
 726                 return strlen( $content );
 727         }
 728
 729         public function execute() {
 730                 wfProfileIn( __METHOD__ );
 731
 732                 parent::execute();
 733
 734                 if ( !$this->status->isOK() ) {
 735                         wfProfileOut( __METHOD__ );
 736                         return $this->status;
 737                 }
 738
 739                 $this->curlOptions[CURLOPT_PROXY] = $this->proxy;
 740                 $this->curlOptions[CURLOPT_TIMEOUT] = $this->timeout;
 741
 742                 // Only supported in curl >= 7.16.2
 743                 if ( defined( 'CURLOPT_CONNECTTIMEOUT_MS' ) ) {
 744                         $this->curlOptions[CURLOPT_CONNECTTIMEOUT_MS] = $this->connectTimeout * 1000;
 745                 }
 746
 747                 $this->curlOptions[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
 748                 $this->curlOptions[CURLOPT_WRITEFUNCTION] = $this->callback;
 749                 $this->curlOptions[CURLOPT_HEADERFUNCTION] = array( $this, "readHeader" );
 750                 $this->curlOptions[CURLOPT_MAXREDIRS] = $this->maxRedirects;
 751                 $this->curlOptions[CURLOPT_ENCODING] = ""; # Enable compression
 752
 753                 /* not sure these two are actually necessary */
 754                 if ( isset( $this->reqHeaders['Referer'] ) ) {
 755                         $this->curlOptions[CURLOPT_REFERER] = $this->reqHeaders['Referer'];
 756                 }
 757                 $this->curlOptions[CURLOPT_USERAGENT] = $this->reqHeaders['User-Agent'];
 758
 759                 $this->curlOptions[CURLOPT_SSL_VERIFYHOST] = $this->sslVerifyHost ? 2 : 0;
 760                 $this->curlOptions[CURLOPT_SSL_VERIFYPEER] = $this->sslVerifyCert;
 761
 762                 if ( $this->caInfo ) {
 763                         $this->curlOptions[CURLOPT_CAINFO] = $this->caInfo;
 764                 }
 765
 766                 if ( $this->headersOnly ) {
 767                         $this->curlOptions[CURLOPT_NOBODY] = true;
 768                         $this->curlOptions[CURLOPT_HEADER] = true;
 769                 } elseif ( $this->method == 'POST' ) {
 770                         $this->curlOptions[CURLOPT_POST] = true;
 771                         $this->curlOptions[CURLOPT_POSTFIELDS] = $this->postData;
 772                         // Suppress 'Expect: 100-continue' header, as some servers
 773                         // will reject it with a 417 and Curl won't auto retry
 774                         // with HTTP 1.0 fallback
 775                         $this->reqHeaders['Expect'] = '';
 776                 } else {
 777                         $this->curlOptions[CURLOPT_CUSTOMREQUEST] = $this->method;
 778                 }
 779
 780                 $this->curlOptions[CURLOPT_HTTPHEADER] = $this->getHeaderList();
 781
 782                 $curlHandle = curl_init( $this->url );
 783
 784                 if ( !curl_setopt_array( $curlHandle, $this->curlOptions ) ) {
 785                         wfProfileOut( __METHOD__ );
 786                         throw new MWException( "Error setting curl options." );
 787                 }
 788
 789                 if ( $this->followRedirects && $this->canFollowRedirects() ) {
 790                         wfSuppressWarnings();
 791                         if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION, true ) ) {
 792                                 wfDebug( __METHOD__ . ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
 793                                         "Probably safe_mode or open_basedir is set.\n" );
 794                                 // Continue the processing. If it were in curl_setopt_array,
 795                                 // processing would have halted on its entry
 796                         }
 797                         wfRestoreWarnings();
 798                 }
 799
 800                 $curlRes = curl_exec( $curlHandle );
 801                 if ( curl_errno( $curlHandle ) == CURLE_OPERATION_TIMEOUTED ) {
 802                         $this->status->fatal( 'http-timed-out', $this->url );
 803                 } elseif ( $curlRes === false ) {
 804                         $this->status->fatal( 'http-curl-error', curl_error( $curlHandle ) );
 805                 } else {
 806                         $this->headerList = explode( "\r\n", $this->headerText );
 807                 }
 808
 809                 curl_close( $curlHandle );
 810
 811                 $this->parseHeader();
 812                 $this->setStatus();
 813
 814                 wfProfileOut( __METHOD__ );
 815
 816                 return $this->status;
 817         }
 818
 819         /**
 820          * @return bool
 821          */
 822         public function canFollowRedirects() {
 823                 if ( strval( ini_get( 'open_basedir' ) ) !== '' || wfIniGetBool( 'safe_mode' ) ) {
 824                         wfDebug( "Cannot follow redirects in safe mode\n" );
 825                         return false;
 826                 }
 827
 828                 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
 829                         wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
 830                         return false;
 831                 }
 832
 833                 return true;
 834         }
 835 }
 836
 837 class PhpHttpRequest extends MWHttpRequest {
 838
 839         /**
 840          * @param $url string
 841          * @return string
 842          */
 843         protected function urlToTcp( $url ) {
 844                 $parsedUrl = parse_url( $url );
 845
 846                 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
 847         }
 848
 849         public function execute() {
 850                 wfProfileIn( __METHOD__ );
 851
 852                 parent::execute();
 853
 854                 if ( is_array( $this->postData ) ) {
 855                         $this->postData = wfArrayToCgi( $this->postData );
 856                 }
 857
 858                 if ( $this->parsedUrl['scheme'] != 'http'
 859                         && $this->parsedUrl['scheme'] != 'https' ) {
 860                         $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] );
 861                 }
 862
 863                 $this->reqHeaders['Accept'] = "*/*";
 864                 if ( $this->method == 'POST' ) {
 865                         // Required for HTTP 1.0 POSTs
 866                         $this->reqHeaders['Content-Length'] = strlen( $this->postData );
 867                         if ( !isset( $this->reqHeaders['Content-Type'] ) ) {
 868                                 $this->reqHeaders['Content-Type'] = "application/x-www-form-urlencoded";
 869                         }
 870                 }
 871
 872                 $options = array();
 873                 if ( $this->proxy ) {
 874                         $options['proxy'] = $this->urlToTCP( $this->proxy );
 875                         $options['request_fulluri'] = true;
 876                 }
 877
 878                 if ( !$this->followRedirects ) {
 879                         $options['max_redirects'] = 0;
 880                 } else {
 881                         $options['max_redirects'] = $this->maxRedirects;
 882                 }
 883
 884                 $options['method'] = $this->method;
 885                 $options['header'] = implode( "\r\n", $this->getHeaderList() );
 886                 // Note that at some future point we may want to support
 887                 // HTTP/1.1, but we'd have to write support for chunking
 888                 // in version of PHP < 5.3.1
 889                 $options['protocol_version'] = "1.0";
 890
 891                 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
 892                 // Only works on 5.2.10+
 893                 $options['ignore_errors'] = true;
 894
 895                 if ( $this->postData ) {
 896                         $options['content'] = $this->postData;
 897                 }
 898
 899                 $options['timeout'] = $this->timeout;
 900
 901                 if ( $this->sslVerifyHost ) {
 902                         $options['CN_match'] = $this->parsedUrl['host'];
 903                 }
 904                 if ( $this->sslVerifyCert ) {
 905                         $options['verify_peer'] = true;
 906                 }
 907
 908                 if ( is_dir( $this->caInfo ) ) {
 909                         $options['capath'] = $this->caInfo;
 910                 } elseif ( is_file( $this->caInfo ) ) {
 911                         $options['cafile'] = $this->caInfo;
 912                 } elseif ( $this->caInfo ) {
 913                         throw new MWException( "Invalid CA info passed: {$this->caInfo}" );
 914                 }
 915
 916                 $scheme = $this->parsedUrl['scheme'];
 917                 $context = stream_context_create( array( "$scheme" => $options ) );
 918
 919                 $this->headerList = array();
 920                 $reqCount = 0;
 921                 $url = $this->url;
 922
 923                 $result = array();
 924
 925                 do {
 926                         $reqCount++;
 927                         wfSuppressWarnings();
 928                         $fh = fopen( $url, "r", false, $context );
 929                         wfRestoreWarnings();
 930
 931                         if ( !$fh ) {
 932                                 break;
 933                         }
 934
 935                         $result = stream_get_meta_data( $fh );
 936                         $this->headerList = $result['wrapper_data'];
 937                         $this->parseHeader();
 938
 939                         if ( !$this->followRedirects ) {
 940                                 break;
 941                         }
 942
 943                         # Handle manual redirection
 944                         if ( !$this->isRedirect() || $reqCount > $this->maxRedirects ) {
 945                                 break;
 946                         }
 947                         # Check security of URL
 948                         $url = $this->getResponseHeader( "Location" );
 949
 950                         if ( !Http::isValidURI( $url ) ) {
 951                                 wfDebug( __METHOD__ . ": insecure redirection\n" );
 952                                 break;
 953                         }
 954                 } while ( true );
 955
 956                 $this->setStatus();
 957
 958                 if ( $fh === false ) {
 959                         $this->status->fatal( 'http-request-error' );
 960                         wfProfileOut( __METHOD__ );
 961                         return $this->status;
 962                 }
 963
 964                 if ( $result['timed_out'] ) {
 965                         $this->status->fatal( 'http-timed-out', $this->url );
 966                         wfProfileOut( __METHOD__ );
 967                         return $this->status;
 968                 }
 969
 970                 // If everything went OK, or we received some error code
 971                 // get the response body content.
 972                 if ( $this->status->isOK() || (int)$this->respStatus >= 300 ) {
 973                         while ( !feof( $fh ) ) {
 974                                 $buf = fread( $fh, 8192 );
 975
 976                                 if ( $buf === false ) {
 977                                         $this->status->fatal( 'http-read-error' );
 978                                         break;
 979                                 }
 980
 981                                 if ( strlen( $buf ) ) {
 982                                         call_user_func( $this->callback, $fh, $buf );
 983                                 }
 984                         }
 985                 }
 986                 fclose( $fh );
 987
 988                 wfProfileOut( __METHOD__ );
 989
 990                 return $this->status;
 991         }
 992 }